CN115929106A - Washable and anti-static electromagnetic shielding tent - Google Patents

Abstract

The invention discloses a decontamination-resistant electromagnetic shielding tent, which belongs to the technical field of electromagnetic shielding tents. The decontamination-resistant electromagnetic shielding tent of the invention is composed of an outer canopy material, an electromagnetic shielding insulation lining, an air column fabric and Base cloth; above the air column fabric is a tarpaulin composed of outer tent material and electromagnetic shielding inner lining; below is the base cloth; the outer tent material includes aramid fabric; the electromagnetic shielding insulation inner lining includes electromagnetic shielding insulation Cotton; the air column fabric includes polyester air column fabric; the base fabric includes polyester base fabric. The tent with decontamination-resistant electromagnetic shielding function obtained by the present invention takes into account tear resistance, wear resistance, bacteriostasis, decontamination resistance and electromagnetic shielding, has strong practicability, and is less affected by venues and meteorological environments.

Description

A decontamination-resistant electromagnetic shielding tent

technical field

The invention belongs to the technical field of electromagnetic shielding tents, in particular to a decontamination-resistant electromagnetic shielding tent.

Background technique

A large number of electromagnetic waves generated by various micro or large devices not only seriously threaten human health and the service life of surrounding electronic devices, but also face the danger of information leakage. Under the background that information security has become a greater concern of people, higher requirements have been put forward for field tents, especially in the military field. Existing tents are mostly used for firefighting and emergency rescue, disaster relief and flood control, field construction and leisure tourism, etc. However, based on the overall development stage of the field, the product form and function are relatively single, and the marketization process is slow.

According to the structure, tents are mainly divided into bracket tents, frame tents, folding tents, grid tents and inflatable tents, etc. Since the objective environment that tents need to face is more complicated, there are relatively many performances that need to be considered, such as Rainproof, breathable, ventilated, etc., but the manufacture of tents with electromagnetic shielding effects for information security, decontamination resistance, tear resistance, wear resistance, antibacterial, and electromagnetic shielding effects is still a technical problem that needs to be solved urgently at this stage.

Contents of the invention

The present invention proposes a decontamination-resistant electromagnetic shielding tent, which is provided with a decontamination-resistant electromagnetic shielding function by making the outer canopy material, the electromagnetic shielding thermal insulation liner, the air column fabric and the base cloth from the inside to the outside. Solve the above technical problems in the prior art.

The main technical solutions include:

The decontamination-resistant electromagnetic shielding tent is composed of outer canopy material, electromagnetic shielding thermal insulation lining, air column fabric and base cloth from inside to outside; above the air column fabric is a canopy composed of outer canopy material and electromagnetic shielding inner lining cloth; the bottom is the bottom cloth; the outer tent material includes aramid fabric; the electromagnetic shielding thermal insulation lining includes electromagnetic shielding thermal insulation cotton; the air column fabric includes polyester air column fabric; the base cloth includes polyester base cloth.

Further, the preparation of the outer cover material includes:

S11, alkali boiling the aramid fiber fabric to remove oil;

S12, placing the TPU solution on a scraper coater;

S13, after coating evenly, place it in an oven to dry;

S14. Turn over to obtain the outer cover material.

Further, the electromagnetic shielding thermal insulation cotton includes an outer layer of electromagnetic shielding function and a thermal insulation inner lining;

The outer layer with electromagnetic shielding function and the thermal insulation lining are combined by mechanical sewing.

Further, the preparation of the polyester air column fabric comprises:

S21, placing the polyester fabric on a scraper coater;

S22, coating the solution containing TPU on the polyester fabric;

S23, after uniform coating, it is placed in an oven to form a uniformly coated TPU layer;

S24, turn over, and then perform the operations described in S21-S23 to obtain the polyester air column fabric.

Further, the preparation of the polyester base fabric comprises:

S31, arranging the polyester sail on the scraper coater;

S32, coating the solution containing PU on the polyester canvas;

S33. After uniform coating, place it in an oven at 20°C to 80°C and dry for 1 hour to 5 hours to form a uniformly coated PU coating;

S34, turn over, and then carry out the operations described in S31-S33 to obtain the polyester base fabric.

Further, the preparation of the polyester base fabric comprises:

S41, arranging the polyester sail on the scraper coater;

S42, coating the solution containing PU on the polyester canvas;

S43. After uniform coating, place it in an oven at 50°C to 70°C to dry for 2 hours to 4 hours to form a uniformly coated PU coating;

S44, turn over, and then carry out the operations described in S41-S43 to obtain the polyester base fabric.

Further, the polyester canvas is dark, preferably black.

Further, the electromagnetic shielding thermal insulation lining is self-made.

Further, the total weight of the decontamination-resistant electromagnetic shielding tent is 1000g/m ² -5000g/m ² .

Further, the total weight of the decontamination-resistant electromagnetic shielding tent is 2000g/m ² -3000g/m ² .

Compared with the prior art, the present invention provides a decontamination-resistant electromagnetic shielding tent. The method of the present invention has the following beneficial effects:

(1) The tarpaulin of the present invention is windproof, waterproof and has a certain tear resistance; the air column has a certain breaking strength; the base cloth has properties such as waterproof, moisture-proof, and puncture resistance; It achieves an electromagnetic shielding effect of 65dB, and at the same time has the properties of anti-shock, decontamination resistance, antibacterial, and heat preservation.

(2) The tent of the present invention has strong practicability and is less affected by the site and weather environment.

Description of drawings

Fig. 1 shows a schematic diagram of the overall structure of a decontamination-resistant electromagnetic shielding tent according to an embodiment of the present invention;

Fig. 2 shows a schematic diagram of an outer canopy of a decontamination-resistant electromagnetic shielding tent according to an embodiment of the present invention;

Fig. 3 shows a schematic diagram of an air column of a decontamination-resistant electromagnetic shielding tent according to an embodiment of the present invention;

Fig. 4 shows a schematic diagram of the base fabric of a decontamination-resistant electromagnetic shielding tent according to an embodiment of the present invention;

Fig. 5 shows the electromagnetic shielding efficiency diagram of a kind of anti-decontamination electromagnetic shielding tent of the embodiment of the present invention;

Figure 6 shows a histogram of the tearing strength of a fabric of different fiber types according to an embodiment of the present invention;

Fig. 7 shows the tear strength histogram of a kind of aramid fiber fabric with different TPU coating amounts of the embodiment of the present invention;

Fig. 8 shows a kind of TPU coating tear contrast figure of the embodiment of the present invention, wherein, (a) is the schematic diagram of uncoated fabric tear process, (b) is coated with TPU coating composite fabric tear schematic diagram;

Fig. 9 shows a kind of TPU/aramid fiber fabric dynamic cone puncture test result figure of the embodiment of the present invention, wherein, (a) shows the average value of the maximum dynamic cone puncture force value of TPU/aramid fiber fabric, (b ) shows the dynamic cone force value-time curve, (c) shows the dynamic stabbing energy value absorbed by the TPU/aramid fabric per unit weight, and (d) shows the TPU/aramid fabric per unit weight in different Absorbed energy-time curve at impact time;

Fig. 10 shows a kind of TPU/aramid fiber fabric dynamic stabbing test result figure of the embodiment of the present invention, wherein, (a) is the average value of the maximum force value of dynamic stabbing, (b) is the stabbing force value-time curve , (c) is the dynamic stabbing energy absorbed by the TPU/aramid fabric per unit weight, (d) is the energy-time curve of the dynamic absorption of the TPU/aramid fabric per unit weight in the effective puncture area;

Fig. 11 has shown a kind of original sample of the embodiment of the present invention and different improved sample cone bayonet stabbing figure;

Fig. 12 shows a kind of pure aramid fiber weaving and TPU coated fabric cone and knife image of the embodiment of the present invention; Wherein, (a) is pure aramid fabric cone image, (b) is TPU coated fabric Cone stabbing image, (c) is the stabbing image of pure aramid fabric, (d) is the stabbing image of TPU coated fabric;

Fig. 13 has shown the plate culture medium antibacterial efficiency figure of a kind of concentration 2% silver-plated polyester gauze of the embodiment of the present invention; Wherein, figure (a) is that sample solution is diluted 10 ³ times of colonies, (b) is sample solution The number of undiluted colonies, (c) is the number of colonies diluted ¹⁰ times by the sample solution;

Fig. 14 shows that a kind of concentration of the embodiment of the present invention is that 2% silver-plated polyester mesh yarn is immersed in NaCl/CaCl ₂ solution, to ^Ag Concentration determination figure; Wherein, figure (a) is silver-plated polyester mesh yarn silver ion Release rate, figure (b) is the relationship between silver-plated polyester mesh contact time and bactericidal efficiency;

Fig. 15 shows the SEM image of a kind of polyester silver-plated mesh yarn after washing according to the embodiment of the present invention;

Fig. 16 shows a kind of 2%, ₄ % AgNO of the embodiment of the present inventionConcentration of impregnated fabric surface topography figure; Wherein, figure (a) is _AgNO3 concentration 2%, figure (b) is _AgNO3 concentration 4 %;

Fig. 17 shows a kind of 3%AgNO of the embodiment of the present invention The surface topography figure of the polyester fabric impregnated under _the concentration;

Fig. 18 shows a kind of polyester gauze of the embodiment of the present invention is impregnated with different AgNO _{Concentrations} conductivity and electromagnetic shielding test figure;

Fig. 19 shows a schematic diagram of an electromagnetic shielding embodiment of the present invention;

Fig. 20 shows the electromagnetic shielding efficiency diagram of a kind of thermal insulation wadding (black) and electromagnetic shielding thermal insulation lining (gray) in the 0-3MHz band according to the embodiment of the present invention;

Fig. 21 shows a kind of original outer tarpaulin (shallow) and improved TPU processing aramid outer tarpaulin (deep) of the embodiment of the present invention in 1 (warp damaged length), 2 (weft damaged length), 3 ( Longitudinal smoldering time), 4 (latitudinal smoldering time), 5 (longitudinal smoldering time) and 6 (latitudinal smoldering time) data comparison chart;

Fig. 22 shows a schematic diagram of an outer tarpaulin windproof and waterproof according to an embodiment of the present invention;

Fig. 23 shows a comparison diagram of the thermal insulation performance of a fabric according to an embodiment of the present invention, wherein, Figure (a) is the thermal resistance ratio of the original sample polyester cotton felt thermal insulation wadding, medical polyester crimped hollow polyester, and electromagnetic shielding thermal insulation lining For the figure, figure (b) is a comparison chart of Cro value, and figure (c) is a comparison chart of heat preservation rate;

Fig. 24 shows a kind of tent tubular fabric tensile strength comparative figure of the embodiment of the present invention;

In the figure, 1. Coated aramid fabric; 2. Electromagnetic shielding outer layer; 3. Thermal insulation inner layer; 4. TPU coating; 5. Polyester fabric; 6. PU coating; 7. Polyester canvas.

Detailed ways

In order to better understand the present invention, specific embodiments will be given to further illustrate the present invention. However, it should be understood that the illustrated embodiments are exemplary embodiments, and the present invention can be implemented in various forms and should not be construed by the description herein. Examples are limited. Rather, these embodiments are provided for more thorough understanding of the present invention, and to fully convey the scope of the present invention to those skilled in the art.

In the following examples, unless otherwise specified, the technical means used are conventional means well known to those skilled in the art, and the reagents and materials in the present invention are obtained from the market or other public channels.

The decontamination-resistant electromagnetic shielding tent of the present invention is composed of outer canopy material, electromagnetic shielding thermal insulation lining, air column fabric and base cloth from the inside to the outside; composed of tarpaulins.

The outer tent material is a high-strength aramid fabric treated with TPU to obtain a tear-resistant, blast-resistant tent outer tarpaulin; the electromagnetic shielding thermal insulation lining is made of silver-plated polyester mesh and 3AM thermal insulation cotton through mechanical sewing It is stitched together to obtain a decontamination-resistant electromagnetic shielding antibacterial tent lining; the air column fabric is a polyester air column fabric with a selected warp and weft density, so as to obtain a tent air column fabric resistant to blasting pressure; the base fabric is warp PU treated wear-resistant polyester base fabric to obtain wear-resistant tent base fabric.

The present invention uses a dome-shaped inflatable tube as a skeleton, and a tarpaulin is pasted on the outside to form an air-ribbed tent. In order to improve the survivability of the tent, the tent of the present invention not only has the function of electromagnetic shielding, but also has the properties of tear resistance, antibacterial, heat preservation and the like. What is important is that the function of the tent remains unchanged after repeated washings, which allows the electromagnetic shielding tent to be used in a variety of complex environments.

The aramid fiber fabric of the present invention is a high-strength and high-toughness aramid fiber fabric, which is processed by thermoplastic polyurethane TPU coating and has flame-retardant and tear-resistant properties.

The thermal insulation inner layer of the present invention is 3AM thermal insulation cotton, and the electromagnetic shielding functional layer is 50g/ ^m2 silver-plated nylon mesh, and the two functional layers are combined together by mechanical sewing.

The polyester fabric described in the present invention is a wear-resistant polyester fabric, which is processed by thermoplastic polyurethane TPU coating and has excellent wear resistance, corrosion resistance and strong adhesion.

The polyester canvas in the present invention is a wear-resistant polyester canvas, which is obtained through polyurethane PU coating and has good wear resistance.

Referring to Figures 1 to 5, in some embodiments of the present invention, a decontamination-resistant electromagnetic shielding tent is provided, which is a field survival tent with multiple functions such as anti-shock, anti-puncture, antibacterial, and heat preservation. The outside includes tarpaulin 1 of high-strength aramid fabric treated with polyurethane TPU, puncture-resistant and waterproof three-layer tarpaulin composed of inner lining, wear-resistant base fabric and air column fabric with high breaking strength. The inner lining is composed of a layer of thermal insulation inner layer 3 and an outer layer of electromagnetic shielding function 2, the wear-resistant base fabric is made of black polyester canvas 7 treated with PU layer 6, and the air column fabric is made of wear-resistant polyester fabric 5 coated with TPU 4 processing comes.

The aramid fabric of the outer canopy material is alkali-boiled to remove oil, and placed in a scraper coater to coat a certain quality of TPU solution. After the coating is uniform, it is dried in an oven and then turned over to obtain the outer canopy material.

In some embodiments of the present invention, based on the many advantages of the aramid fabric, it is selected as the base material of the tent outer tarpaulin. In addition, in order to further improve the tear resistance and anti-knock impact performance, the present invention has carried out TPU coating treatment on it. The specific preparation process is as follows: first, place the selected high-strength aramid fabric in deionized water containing NaOH and Na ₂ CO ₃ , heat it in a water bath for a certain period of time, then wash it with decontamination water, and dry it to remove oil and other stains on the surface of the fabric. Impurities, complete the pretreatment of the original fabric; then prepare TPU solutions with different concentrations, and screen out the TPU solution with the best mass fraction; then use the blade scraping method to evenly scrape the TPU solution on the aramid fabric, and then Naturally air-dried at room temperature to obtain an improved aramid composite fabric coated with TPU solution. Finally, the tear strength and anti-knock performance of the improved aramid fabric were tested by a universal strength tester.

In some embodiments of the present invention, the preparation method of the lining material includes: first, preparing silver nitrate solutions with different concentration gradients, adding an appropriate amount of ammonia water and stirring until the solution is transparent; then dipping the polyester mesh in the silver nitrate solution at room temperature time; then, dissolving sodium potassium tartrate, NaOH and glucose in deionized water to prepare a reducing solution, and adding the reducing solution dropwise to the silver nitrate solution containing polyester mesh; finally, washing the polyester mesh composite fabric with deionized water After drying for several times, the silver-plated polyester mesh is obtained, and the polyester mesh with the best electromagnetic shielding performance is selected as the electromagnetic shielding functional layer.

Choose 341.2g/m ² thermal insulation flakes and 188.6g/m ² 3AM thermal insulation cotton as the inner lining material insulation layer, test the thermal insulation rate with a flat-panel insulation instrument, and comprehensively select the performance according to the weight per square meter and the value of the thermal insulation rate The best thermal insulation cotton is used as the thermal insulation layer; then a layer of polyester mesh and a layer of thermal insulation are sewn by mechanical sewing to obtain the lining in the three-layer tarpaulin.

The outer layer with electromagnetic shielding function and one layer of thermal insulation inner layer are combined into an inner lining by mechanical sewing. The thermal insulation inner layer is 3.0-5.0mm synthetic fiber cotton.

Put the wear-resistant polyester fabric on the scraper coater, coat it with a certain quality of TPU solution, and put it in the oven after coating evenly to form a uniformly coated TPU layer; then turn it over, and then perform the above operation to obtain Air column fabric.

In some embodiments of the present invention, the preparation method of the air column tubular fabric includes: first matching the 3/1 weave and the plain weave, using polyester as the warp yarn, and using polyester yarn at the longer weft floating line in the 3/1 weave The core-spun yarn formed with the spandex yarn is the weft yarn, and the rest of the weft yarn is made of polyester yarn. After the fabric is off the machine, due to the difference in the structure, the tension in the weft direction of the propped up fabric disappears, and at the same time, under the action of the restoring force of the elastic core-spun yarn, the floating long lines in the weft direction of the fabric shrink to form a tubular fabric. Secondly, the TPU slurry is coated on the tubular fabric by the knife-edge rolling method. During the coating process, the fabric is installed on the frame of the coating machine, and the knife is placed on the surface of the fabric at a given distance to determine the thickness of the coating. Pour a certain amount of TPU coating slurry before the knife edge, and then move the knife slowly on the surface of the fabric to spread the TPU coating slurry evenly. The thickness of the coating can be controlled by adjusting the distance between the knife edge and the fabric, and finally a TPU coated polyester fabric is obtained.

Arrange the black polyester sail on the scraper coater, coat it with a certain quality of PU solution, and put it in the oven to dry for a period of time after coating evenly to form a uniform PU coating, then turn it over, and then carry out The above operation obtains the tent base fabric.

In some embodiments of the present invention, the preparation method of the base cloth includes: dissolving polyurethane (PU) in dimethylformamide (DMF) to make PU slurry, using a laboratory coater, and coating with the prepared PU. After the coating is completed, it is immersed in water. Since DMF can be infinitely miscible with water, but PU is insoluble in water, the concentration of PU increases rapidly and deposits on the base fabric to form a coagulated film; the sample After drying, the base fabric with PU coating is finally formed.

The top of the air column fabric is a three-layer tarpaulin, and the bottom is a tent base fabric.

According to the characteristics of the air-rib tent, the three-layer tarpaulin, air column fabric, and tent base fabric are combined through composite design to obtain a tent with decontamination-resistant electromagnetic shielding function.

Example 1

In some embodiments of the present invention, a tear resistance test experiment of an outer tarpaulin is provided.

According to the GB/T 3917.3-2009 standard, the tear strength of the trapezoidal sample is measured by using a strength machine. Clamp the two non-parallel sides of the trapezoid, apply a continuously increasing force to the sample, make the tear spread along the width direction of the sample, and measure the average maximum tear force. The size of the sample is (75±1)mm×(150±2)mm. Use the template to draw an isosceles trapezoid on each sample, and cut a cut at the top. First, set the distance between the two clamps to (25±1) mm, the tensile speed to 100 mm/min, and select an appropriate load range so that the tearing strength range falls between 10% and 90% of the full scale. With the cut in the middle of the two clamps, the short side of the trapezoid remains stretched and the long side is crumpled. Start the instrument, record the tearing strength with an automatic recorder, and the unit is Newton (N). Automatically calculate the average value of a series of effective peak values of each sample in the longitude (longitudinal) and latitude (transverse) directions on the recorder, calculate the average value of the results of five samples in the warp (longitudinal) and latitude (transverse) directions, and keep two digits, and calculate the coefficient of variation, accurate to 0.1%.

result:

Fibers with high modulus are often used in the field of stab resistance and tear resistance. Aramid fiber has high strength. In addition to excellent mechanical properties, its light weight also makes aramid fiber a stab and tear resistance. Preferred material for orientation. PBO fiber is the fiber with better mechanical properties among the fibers found so far. It has high temperature resistance, flame retardancy, does not burn or shrink in the flame, and is mainly used in the fields of flame retardancy, bulletproof and stab resistance. High-strength polyester has excellent mechanical properties, high initial modulus, high strength and good fatigue resistance, and good dimensional stability. In the present invention, mechanical performance tests and analyzes are mainly carried out for the above three high-performance fibers, and through process improvement and material optimization, the optimal aramid fabric is finally selected as the outer tarpaulin material of the present invention.

See Figure 6 and Figure 7, the tear strength test comparison results of different fiber types (Table 1) and aramid fabrics with different TPU coating amounts (Table 2).

Table 1 Specifications and test data of different fiber types of fabrics

Table 2 Different TPU coating amounts and test data of aramid fabrics

The energy dissipation mechanism in the tearing process of aramid and TPU coated aramid fabrics was analyzed. Figure 8(a) and Figure 8(b) show evidence of energy dissipation during tearing associated with different samples. The high tenacity TPU composite coating can make the interface tougher, which makes the aramid composite fabric have greater mechanical strength. The TPU and fibers are in full contact, and the resulting strong bonded interface helps dissipate energy. When the pure aramid fabric is stretched, after the displacement increases to a certain length, the degree of tearing damage between the two sides of the fabric and the main body can be observed, and the transverse fibers are gradually pulled out from the fabric. The tearing process is shown in Figure 8(a ) shown. Unlike pure aramid fabrics, TPU-coated aramid fabrics have a blunted initial notch, and the tear force does not propagate immediately. The main deformation occurs around the initial notch bearing the high load, and the blunted notch effectively reduces the stress concentration and dissipates the tearing energy. With the gradual increase of the displacement, the TPU matrix ruptures, and at the same time the fibers are pulled out from the deformed main body area until the sample fails completely, the tearing process is shown in Fig. 8(b).

According to the GB/T 3917.3-2009 standard, the tear strength of aramid fabric samples with different TPU coating amounts was measured using a universal strength tester. The original fabric of 265g/ ^m2 was tested for warp and weft tear strength, and the warp and weft tear strengths were T: 235.64N, W: 321.08N. In order to obtain an improved sample that meets the requirements, first select the 200g/ ^m2 pure aramid woven fabric for the tear strength test, and the warp and weft tear strengths are increased by 160% and 99% respectively; then the 200g/ ^m2 aramid machine fabric The outer part of the trapezoidal hypotenuse of the fabric and poly-p-phenylene benzobisoxazole (PBO) fabric is treated with TPU coating. The test results show that the warp and weft tear strengths are increased by 207%, 167% and 215%, 59% respectively; The 200g/ ^m2 aramid woven fabric is fully coated with TPU solution, and the force values in the warp and weft directions are significantly improved, respectively T: 1457.946N, W: 1103.75N. 244%; then select the 250g/ ^m2 aramid woven fabric for the same polyurethane coating treatment, and the measured warp and weft force values are T: 1638.22N, W: 1454.15N, which are respectively increased by 595% and 1454.15N compared with the original fabric. 353%. The warp and weft tear force values of the above different TPU coated fabrics are not greater than 1500N at the same time, which does not meet the requirements. Finally, the 400g/ ^m2 aramid woven fabric was used for the same coating treatment, and the measured warp and weft tear force values were greatly improved, all greater than 4500N, compared with the active tent (original sample) in the current tent They are increased by 1810% and 1302% respectively, which are far greater than the target requirement that the tear resistance performance (test index: tear strength) be improved by no less than 100% (≥1500N).

Example 2

In some embodiments of the present invention, a test experiment of anti-knock impact performance of an outer tarpaulin is provided.

The samples were tested according to the impact test of the EN: 388 standard, and the dynamic mechanical puncture was performed using a drop weight impact testing machine (Taiwan Xinzhi Electronic Automation Co., Ltd.) with an automatic recorder. Lift the dynamic impact head with a certain weight to a certain height to simulate the force value of puncture, and let it fall freely for impact test. Every time a free fall impact is performed, record the maximum force value on the recorder. Each sample was cut into a square with a size of 10 cm, 5 samples were prepared for each group, 4 were randomly selected, and the average value was calculated for each group of four measurements. The clamp ring consists of 2 steel discs and 4 clamping nuts, the thickness of the steel disc is not less than 10mm, and there is a hole with a diameter of (20±0.5)mm in the center. The clamping ring ensures that the specimen does not slip during the test. Put the sample with a size of 10cm and the clamp ring on the strength tester, firmly clamp the sample between the clamp rings, release the dynamic impact head with a weight of 4kg from a height of 0.2m, and record it on the recorder Make a note of the maximum force required to penetrate the specimen.

result:

The test results of dynamic cone resistance of TPU/aramid fabrics are shown in Figure 9. From Figures 9(a) to 9(d), it can be seen that the dynamic cone resistance of TPU20 fabrics is 230% higher than that of pure aramid fibers. Compared with TPU15 and TPU25, the coated fabric has a higher dynamic cone thrust value, and the coated fabric SiO ₂ 3%-TPU has the best improvement effect on the dynamic cone thrust value, which is 277% higher than that of pure aramid fabric. %. After the fabric is coated with TPU, the dynamic puncture energy absorbed by the coated fabric per unit weight increases significantly. The coated fabric SiO ₂ 3%-TPU has the highest absorption value of dynamic stabbing energy, which is 181% higher than that of pure aramid fabric, and the absorbed stabbing energy per unit weight is 1.69J/g. The untreated pure aramid fabric has less force between the yarns, and it is easy to slip during puncture, resulting in less number of yarns that resist cone puncture, so its dynamic puncture force value and the puncture energy absorbed by the fabric are lower. It can be seen from the TPU enhanced anti-stab mechanism that TPU increases the force between the yarns, increases the number of yarns participating in the anti-stab, and increases the puncture stress that the fabric yarn can bear, which better improves the dynamic cone performance of the fabric. .

The dynamic stab resistance performance of TPU coated fabrics is shown in Figure 10. From Figures 10(a) to 10(d), it can be seen that the dynamic stab force value and the energy absorbed per unit weight of the fabric after TPU coating Compared with pure aramid fabric has been improved. The dynamic stabbing force values of TPU coated fabrics under different parameters are not much different, and the dynamic stabbing energy absorbed by TPU coated fabrics containing SiO ₂ is further improved compared with that of coated fabrics without SiO ₂ . The dynamic stab force value of the coated fabric TPU20 increased by 204% compared with the pure aramid fabric, while the stab force value of the fabric SiO2 3%-TPU increased by 215% compared with the pure aramid fabric. The dynamic stabbing energy absorbed by the coated fabric SiO ₂ 3%-TPU per unit weight is 3.13J/g, which is 175% higher than that of the pure aramid fabric. During the dynamic stabbing process, the yarns of the fabric and the TPU film have a certain resistance to the knife head. After the TPU coating, the force between the yarns of the fabric is greater, and the number of yarns participating in the resistance to puncture is increased, increasing the number of yarns. The number of threads and the stress-bearing area of the fabric have been improved, and the dynamic stab resistance performance has been improved.

The test results of different grammage fabrics and different TPU coating amounts of aramid fabrics of the same grammage are shown in Figure 11, and the energy dissipation mechanism during the puncture process of aramid fabrics was analyzed. 12(c) It can be seen that during the puncture process of the pure aramid fabric yarn, the yarn near the puncture head has a larger strain, and the farther away from the puncture head, the smaller the strain. The low friction coefficient between yarns of pure aramid fabric results in low force between yarns, and fewer yarns participate in the resistance to puncture, so that only the yarns near the puncture head produce larger deformation. Therefore, the stress and strain generated by the pure aramid fabric during the puncture process are relatively concentrated, and the strain area is concentrated near the puncture head. At the initial stage of puncture, the stress areas carried by the top and bottom aramid fabrics are small, and the puncture stress is concentrated near the puncture point. As the puncture time increases, the stress area of the fabric gradually increases, and the puncture stress moves from the top to the bottom and to the bottom in the form of stress waves. On the outside transfer, after the tapered part of the piercing head completely penetrates the fabric, the stress and stress area carried by the fabric gradually decreases. No yarn breakage occurred in the pure aramid fabric during the piercing process. The stress cloud images of the fabric under different puncture loading times can be seen that the fabric is mainly stressed in the "cross-shaped" area during the puncture process, and the stress on the fabric is mainly concentrated on the yarn near the contact between the puncture head and the fabric. The puncture stress is relatively concentrated. At the initial stage of piercing, the piercing head first contacts the fabric yarn, and the piercing head produces compression and piercing action on the yarn, and the yarn bears the stress and spreads the stress outward in the form of waves. The stress area increases gradually.

From Figure 12(b) and Figure 12(d), it can be seen that the yarn has a small amount of slippage and deformation in the fabric surface, and the yarn basically does not break, and there is a clear and clear gap between the puncture head and the fabric. Obvious holes. In the initial stage of puncture, the puncture stress on TPU is mainly concentrated in the place where it is in contact with the puncture head, and the stress on TPU presents a point-like distribution. As the loading time increases, the puncture stress is transmitted outwards in the form of stress waves, which gradually increases the stress value and stress-bearing area of the TPU. The warp and weft yarns in contact with the piercing head and the nearby yarns mainly bear the piercing stress, and the interlaced warp and weft yarns still present a "cross-shaped" stress situation. TPU can bear part of the puncture stress suffered by the TPU/aramid fabric and can better transmit the puncture stress to a larger area outside, and at the same time make more units of the composite fabric bear stress. The TPU film has a certain strength, and the bond between the TPU film and the yarn increases the force between the yarns. During the puncture process, the TPU between the yarns drives the nearby yarns to jointly bear the puncture stress. Aramid fabric has a 29% boost. TPU improves the puncture stress that the fabric can bear during the puncture process and increases the amount of puncture stress that the fabric yarn can bear.

At the same time, according to the EN: 388 standard, the impact test of dynamic puncture force (anti-knock performance) was carried out with a drop weight impact testing machine, and the anti-knock impact performance (test index: dynamic puncture force) was improved by no less than 200% (≥100N ).

Example 3

In some embodiments of the present invention, a test experiment for the antibacterial performance of the lining material is provided.

According to GB/T20944, the antibacterial performance of textiles is determined by the oscillation method. Staphylococcus aureus (ATCC6538), Escherichia coli (ATCC11229) and Candida albicans (ATCC10231) were selected as experimental bacteria. Cut the antibacterial fabric sample and the control sample into fragments of about 5mm×5mm in size, and weigh 0.75g±0.05g as a sample. Afterwards, the samples were put into an autoclave and sterilized at 121°C and 103kPa for 15 minutes. Put the sample and the control sample into Erlenmeyer flasks with a certain concentration of test bacteria liquid respectively, shake at a specified temperature for a certain period of time, and measure the concentration of viable bacteria in the Erlenmeyer flask before shaking and after shaking for a certain period of time. Shake for 18 hours, compare the concentration of live bacteria in the flask of the control sample and the antibacterial fabric sample, and calculate the antibacterial rate according to the formula (retaining two effective digits) Y=(Wt-Qt)/Wt×100%, where: Y-- The antibacterial rate of the sample; Wt--the average value (CFU/mL) of the viable bacteria concentration in the flask after 18h shaking contact of 3 control samples; Qt--3 antibacterial fabrics (or 3 fabrics without antibacterial treatment) test The average value (CFU/mL) of the concentration of viable bacteria in the flask after 18h shaking contact of the sample.

Result: referring to Fig. 13 (a), the bacterial solution of the silver-plated polyester mesh was diluted ¹⁰³ times, and the number of colonies was 82. As shown in Figure 13 (b) and Figure 13 (c), the bacterial solution that has not been contacted with the washed silver-plated polyester mesh is not diluted, and no colony grows in the plate, indicating that the silver-plated polyester mesh has killed all bacteria in contact with it. The number of colonies obtained after contacting the bacterial solution of the silver-plated polyester mesh after washing was ¹⁰² times and the number of colonies obtained was 59, and the calculated bacteriostatic rate was 92.82%.

The thickness of single fiber of silver-plated polyester mesh synthetic fiber is uniform, and the fiber surface is uniform and smooth, which makes it easier for silver particles to deposit, and the released Ag ⁺ has a good bactericidal effect. Ag ⁺ was detected in silver-plated polyester mesh between 0 and 6 hours, which indicated that silver particles could be transformed into Ag ⁺ . Referring to Figure 14(a), the Ag ⁺ concentration of the silver-plated polyester mesh before washing is significantly higher than that after washing, so the antibacterial rate of the silver-plated polyester mesh decreases. Before washing the silver-plated polyester mesh, the increase rate of Ag ⁺ concentration gradually slowed down. Although the Ag ⁺ concentration decreased after the fabric was washed, the release rate of Ag ⁺ accelerated after 3 hours, which may be due to the gradual swelling of the exposed fibers leading to the conversion of silver particles into Ag ⁺ . In the UV absorption value test of the bacterial suspension, the silver particles are transformed into Ag ⁺ after contacting the aqueous solution, so that the growth of the bacteria is inhibited or destroyed. The growth of the bacteria can be known by measuring the absorbance change of the bacterial suspension at 260nm. Referring to Fig. 14(b), the absorbance ratio (OD value) of the fabric exposed to the bacterial suspension before and after washing changes with time, reflecting the rate of bacterial destruction. The concentration of 2% silver-plated polyester mesh contacted with the bacterial suspension within 1.5h before washing, the OD value increased rapidly, then slowed down, and almost remained unchanged after 6h. The OD value of the washed silver-plated polyester mesh increased more slowly throughout the test and was significantly lower than before washing. This is because the fabric contains some loose silver particles which are easy to release before washing, and the remaining silver particles after washing are less and more difficult to release.

When the concentration of silver-plated polyester mesh is increased to 3%, the antibacterial rate is as follows: the antibacterial rate of Candida albicans: 98%; the antibacterial rate of Escherichia coli: 99%; the antibacterial rate of Staphylococcus aureus: 99%. Compared with the usual fabric antibacterial rate and the original tent lining material without antibacterial effect, the antibacterial effect of the improved silver-plated polyester mesh in the present invention is significantly improved. Compared with the original tent lining material, the antibacterial effect of the improved silver-plated polyester mesh is not less than 300% (≥70%).

Example 4

In some embodiments of the present invention, a test experiment for the decontamination resistance performance of the lining material is provided.

According to the non-standard FB-NXX-2022071501, the decontamination resistance performance test is carried out. Staphylococcus aureus (ATCC6538), Escherichia coli (ATCC11229) and Candida albicans (ATCC10231) were selected as experimental bacteria. Take a small sample of more than 20g from the large sample of antibacterial fabric. The test conditions are 40°C±3°C, the bath ratio is 1:30, and the concentration of AATCC1993WOB phosphorus-free standard detergent is 0.2%. The following procedure is equivalent to 5 washes (taking a 20g cloth sample as an example, the actual test should increase the amount of water and detergent in proportion to the sample): Add 6L of hot water at 40°C±3°C to the washing machine, add 20g of the sample and wash with it Fabric 180g, detergent 12g, start washing for 25min. Drain and wash with 6L tap water for 2 minutes. Take out the fabric and centrifuge for 1 min. Then wash with 6L tap water for 2 minutes, take out the fabric, centrifuge for 1 minute, repeat this procedure, and wash 10 times. To prevent residual detergent from interfering with the antimicrobial performance test, the samples should be thoroughly rinsed at the end of the last procedure and then left to dry or oven dry. Cut the antibacterial fabric sample and the control sample into fragments of about 5 mm × 5 mm in size, and weigh 0.75 g ± 0.05 g as a sample. Subsequently, some samples were put into an autoclave, and sterilized at 121°C and 103kPa for 15 minutes, and then all samples were subjected to antibacterial operation. Compare the live bacteria concentration in the flask of the control sample and the antibacterial fabric sample, and calculate the bacteriostatic rate by the formula described in Example 3.

Results: Due to the smooth surface of the polyester fiber, the deposition of silver particles is more uniform, and it is not easy to fall off after decontamination, which makes the silver-plated polyester mesh have excellent decontamination resistance and antibacterial properties. Figure 15 shows the morphology and silver loading degree of silver-plated polyester mesh with a concentration of 2% after washing. There are a large number of silver particles on the silver-plated polyester mesh after washing 0 times. After washing 5 times, part of the silver layer on the fabric has been damaged. Destruction, the silver particles in the silver layer are loose, but the remaining silver particles are still relatively large, and a large number of continuous silver layers remain; after washing for 10 times, more and more fibers are exposed, and the silver particle content on the fibers is significantly reduced. The silver layer on the surface of the fabric has shed a lot, and its decontamination resistance and antibacterial performance after decontamination both show a significant downward trend.

Comparing the relationship between the amount of silver plating and washing during the silver deposition process, it is found that the content of silver particles is related to the number of washings and the shape of the fiber. The silver layer deposited on the surface of the polyester fiber with uniform size and smoothness is dense and uniform, and the metal silver layer covers the fiber. more. After 10 times of washing, the antibacterial rate of 3% polyester silver-plated mesh gauze with improved concentration of tent lining material: the antibacterial rate of Candida albicans: 98%; the antibacterial rate of Escherichia coli: 99%; the antibacterial rate of Staphylococcus aureus: 99%. The antibacterial rate of the silver-plated polyester mesh yarn of the improved tent lining has not decreased, indicating that it has super strong decontamination resistance and antibacterial property after decontamination, which is higher than the expected decontamination resistance and the improvement is not less than 100% (≥5 times) requirements, can be applied to tent fabric inner lining material.

Example 5

In some embodiments of the present invention, a test experiment for the anti-electromagnetic shielding performance of the lining material is provided.

According to the standard of SJ 20524-1995, the original lining and the improved lining are tested for plane wave shielding effectiveness. Before testing, the original lining and the improved lining need to be stored in an environment with a temperature of (23±2)°C and a relative humidity of (50±5)°C for 24 hours. Calibrate the flange coaxial test device with a standard sample of polyester film (surface resistance: 5±2Ω per surface area, 32±2dB shielding effectiveness) plated with gold on one side. Put the standard samples into the flange coaxial measuring device respectively, and tighten the fastening nut with a special wrench, adjust the signal source to a certain test frequency point, set the output level to a moderate level, adjust the electromagnetic interference measuring instrument (interference receiving machine) frequency to maximize reading. Increase the output level of the signal source so that the reading of the electromagnetic interference measuring instrument (interference receiver) is greater than the estimated value of the shielding effectiveness of the original lining and the improved lining under test, and record this reading V0 (dBμV). Keep the signal source frequency and output level unchanged, observe the reading of the electromagnetic interference measuring instrument (interference receiver), if the reading is at least 10dB higher than the background noise, record the reading Vt (dBμV) of the interference measuring instrument at this time; according to SE (dB) = V ₀ -V _t Calculate the shielding effectiveness of the two samples. Keeping the output of the signal source unchanged, changing the frequency of the signal source, and repeating the above steps, the shielding effectiveness of the original lining and the improved lining at different frequency points can be measured.

Results: The bonding force between the conductive layer and the base material and the deposition amount of the conductive layer affect the electromagnetic shielding performance. In the present invention, polyester mesh yarn is selected as the base material of the electromagnetic shielding functional layer. The polyester molecule has no other polar groups, so the hydrophilicity of the polyester fiber is very poor. In order to improve the interfacial adhesion between the Ag layer and the polyester mesh and enhance the electromagnetic shielding performance, the present invention selects dopamine (DA) as the hydrophilic treatment. The polyester mesh yarn is treated with an agent to obtain a hydrophilic polyester mesh yarn that is hydrophilic and can be well combined with the conductive Ag layer. During the silver plating process, nano-silver will be coated on the fabric, and with the change of the concentration of AgNO ₃ solution, the situation of deposition on the silver plating is also different. Figure 16(a) shows that when the concentration of _AgNO3 is 2%, a conductive Ag layer appears on the fabric, but some fibers are still exposed. However, when the concentration of AgNO ₃ in Fig. 16(b) is 4%, there is a phenomenon of particle accumulation, which is formed by excessive accumulation of nano-silver particles. According to the AgNO concentration of ₂ %, the silver-plated polyester mesh yarn has insufficient decontamination resistance, and the lack of important concentration parameters is the data analysis under AgNO ₃ %. The present invention changes the concentration of AgNO to ₃ %. Under the premise of decontamination, explore the electromagnetic shielding performance. It was shown that when the AgNO ₃ concentration was 3% (see FIG. 17 ), nano-silver was uniformly wrapped on the silver-coated polyester fiber. The conductivity of polyester mesh yarns was tested by testing the concentrations of 0.5%, 1%, 2% and 3% AgNO ₃ . The conductivity continuously increases with increasing _AgNO3 concentration. When the concentration of AgNO ₃ is 0.5%, the conductivity of the composite film is 17.06S/cm, when the concentration of AgNO ₃ is 1%, the conductivity of the composite film is 30.58S/cm, and when the concentration increases to 2%, the conductivity increases to 85.22S/cm. And when the concentration of AgNO ₃ is 3%, the conductivity increases to 85.22S/cm, see Figure 18(a), indicating that when the concentration of AgNO ₃ is 3%, a continuous conductive network has been formed. The porous structure of polyester mesh and the construction of nano-silver conductive network increase the multiple reflections of electromagnetic waves inside the material, thereby improving the electromagnetic shielding effect. Electromagnetic radiation mainly has two mechanisms: absorption and reflection. Reflection can be divided into direct reflection (SER) and indirect reflection (SEM). The invention evaluates the electromagnetic shielding interference effect of the polyester mesh yarn in the 0-3GHz band under different AgNO ₃ solution concentrations. The EMI SE shown in Fig. 18(b) increases with the increase of AgNO ₃ concentration. The average electromagnetic interference SE was 21.3dB after treatment with 0.5% AgNO ₃ concentration. The average electromagnetic interference SE after 1% AgNO ₃ concentration treatment is 38dB. When the AgNO ₃ concentration increased to 2%, the average electromagnetic interference SE was 57dB. When the concentration of AgNO ₃ increases to 3%, the average electromagnetic interference SE is 65dB, far reaching the requirements of commercial applications (20dB) and industrial applications (30dB). It can be seen that as the concentration of silver ions increases, the electromagnetic shielding performance is better, but when it exceeds 3%, nano-silver accumulates and the decontamination resistance is insufficient.

Referring to Figure 19, it shows a schematic diagram of the electromagnetic shielding of polyester mesh. When the electromagnetic wave is incident on the surface of the polyester mesh, it hits the surface of the nanoporous Ag layer, and some incident waves are reflected due to the abundant free electrons on the highly conductive Ag surface. The remaining electromagnetic waves are transmitted to the many porous parts of the silver layer, and the silver surface acts as a mirror, causing multiple reflections of the electromagnetic waves. In the process, the induced current due to ohmic loss reduces the energy and intensity of the electromagnetic waves. Finally the electromagnetic wave completely loses its intensity and energy and is absorbed by the Ag structure. In addition to the electromagnetic shielding effect, Ag itself also has excellent antibacterial properties. 3% is the optimal concentration of AgNO ₃ solution in terms of surface morphology, electrical conductivity and EMI SE value, which is consistent with the silver content used to obtain the best antibacterial performance.

The silver-plated polyester mesh prepared in 3% AgNO ₃ solution and 3AM thermal insulation cotton are designed into electromagnetic shielding thermal insulation lining by mechanical sewing. According to the standard of SJ20524-1995, the thermal insulation wadding and the electromagnetic shielding thermal insulation lining prepared by the present invention were selected as comparative samples, and the electromagnetic shielding efficiency in the 0-3MHz band was observed. It can be seen from Figure 20 that the electromagnetic shielding efficiency of the thermal insulation wadding lining is below 60% in most bands of 0-3000MHz, while the electromagnetic shielding efficiency of the improved electromagnetic shielding thermal insulation lining has reached 99.99%. It can be seen that the electromagnetic shielding thermal insulation inner lining prepared by the present invention has excellent electromagnetic shielding performance, and the silver-plated polyester mesh electronic safety of the inner lining is good, and the anti-electromagnetic interference and electromagnetic weapon attack ability are strong, and the shielding efficiency exceeds 60dB, and the quality is less (single layer 50-60g/m ² ), and is less affected by the site and meteorological environment, showing great advantages.

The electromagnetic shielding efficiency of the electromagnetic shielding insulation lining is 99.99%. Compared with the highest shielding efficiency of the original sample insulation floc, the electromagnetic shielding performance has been improved by 66.65%.

Example 6

In some embodiments of the present invention, a flame retardant performance test experiment of an outer tarpaulin is provided.

Using the GB/T 5455-2014 standard, the bottom edge of the textile is ignited in the vertical direction. After the specified ignition time, the after-flame time, smoldering time and damage length of the sample are measured to test the flame-retardant performance of the improved outer tarpaulin. . Measure the original outer tarpaulin and the improved outer tarpaulin from the position 1/10 width away from the selvedge, and cut out a sample with a size of 300mm×80mm; For a block sample, the warp (longitudinal) sample cannot be taken from the same warp yarn, and the weft (transverse) sample cannot be taken from the same weft yarn; the sample is in a secondary standard atmosphere, that is, the temperature is 20 ° C ± 2 ° C, the relative humidity is 65 %±3%, place it for 8-24h. Until it reaches equilibrium, then take it out and put it in a sealed container, or treat it according to the conditions agreed by all parties concerned. To analyze the test results, first record the samples that cause the absorbent cotton to burn during the combustion process. For some samples, for the samples that melt and connect together during combustion, the highest point of melting should prevail when measuring the damage length , some of the samples may be burned through, record the measured values of the after-flame time, smoldering time and damage length of the unburned samples, and indicate in the test report how many samples have burned through, and calculate the The average value of the afterflame time, smoldering time and damage length of five samples in the direction (longitudinal) and latitude (transverse).

Results: The original outer tarpaulin and the improved TPU-treated aramid outer tarpaulin had no dripping during the burning process, but the damage length, after-burning time and smoldering time were quite different. The original outer tarpaulin spread rapidly when encountering flames, with damage of 117mm in the warp direction and 120mm in the weft direction, while the improved TPU-treated aramid outer tarpaulin spread extremely slowly when encountering flames, with damage of 3mm in the warp and weft directions. There is no smoldering phenomenon in the warp and weft directions of the original outer tarpaulin, the after-burning time in the meridian direction is 3.4s, and the after-burning time in the weft direction is 7.9s. The improved TPU-treated aramid outer tarpaulin has a meridian smoldering time of 10.4s, a weft smoldering time of 10.0s, a meridional afterburning time of 1.2s, and a latitudinal afterburning time of 1.1s (see Figure 21). Although the improved TPU treated aramid outer tarpaulin has a smoldering phenomenon, the afterburning time and damage length corresponding to the warp and weft directions are far less than the original outer tarpaulin. In particular, the warp and weft damage length of the improved TPU-treated aramid outer tarpaulin is 3 mm, indicating that the improved TPU-treated aramid outer tarpaulin has excellent flame retardancy. This is mainly because the TPU on the surface is rapidly carbonized to form a charcoal layer when it encounters a flame, which can serve as a physical barrier to prevent heat transfer, and further improve the flame retardancy of the aramid nonwoven fabric.

Example 7

In some embodiments of the present invention, a windproof performance test experiment of an outer tarpaulin is provided.

Using the GB/T 5453-1997 standard, under the specified pressure difference conditions, measure the airflow rate vertically passing through the given area of the sample within a certain period of time, and calculate the air permeability. Place the original outer tarpaulin and the improved outer tarpaulin in a circular air hole with a test area of ^20cm2 , and use an appropriate sample support net for the air hole with a larger test area. Fix the sample with the clamp evenly, and the rubber gasket matches the clamp to ensure that the edge of the sample does not leak. The airflow smooth suction device (fan) makes the air with standard temperature and humidity enter the sample round platform, and the airflow passing through the sample produces a pressure drop of 200Pa. A flow meter, volume meter or measuring aperture displays the flow rate of the airflow in dm ³ /min (L/min). Calculation and presentation of results: Calculate the arithmetic mean qv and coefficient of variation (to the nearest 0.1%) of the measured values. Calculate air permeability R=qv/A×167(mm/s); R=qv/A×0.167(m/s), where: qv--average air flow, dm ³ /min(L/min); A -- test area, cm ² ; 167 -- conversion factor from dm ³ /min×cm ² to mm/s; 0.167 -- conversion factor from dm ³ /min×cm ² to m/s.

Results: When the tightness of the fabric remained constant, the air permeability of the fabric decreased with the increase of warp and weft arrangement density or the increase of yarn density. Within a certain range, if the twist of the yarn increases, the diameter and tightness of the yarn will decrease, and the air permeability of the fabric will be enhanced. The windproof performance is shown in Figure 22. The smaller the airflow is, the greater the airflow isolation is. Finally, the air permeability of the original outer tarpaulin is less than 1, and the air permeability of the aramid-coated TPU improved sample is less than 1. Referring to GB/T 5453-1997, if the air permeability is less than 1, it means that the density of the warp and weft yarns is high, and the air permeability is low, that is, the windproof performance is good. Up to standard. However, while taking into account the windproof performance in practical applications, it is still necessary to pay attention to other properties of the tent. Through a comprehensive comparison of the flame retardancy of the original sample and the improved sample and the tear strength of the two, the improved sample with aramid coated TPU is stronger than the original sample in terms of flame retardancy and tear strength. It has greater advantages in application and can better meet the requirements of military tents.

Example 8

In some embodiments of the present invention, a performance test experiment of the thermal insulation rate of the inner lining material is provided.

According to the standard of GB/T 11048-1989, the thermal insulation performance of the original lining and the improved lining is measured by the flat plate constant temperature difference heat dissipation method. In the test, the original inner lining and the improved inner lining are covered on the test board. The test board, the bottom board and the surrounding protective board are all controlled by electric heating to maintain a constant temperature, so that the heat of the test board can only pass through The direction of the sample is distributed, measure the heating time required for the test plate to maintain a constant temperature within a certain period of time, and calculate the heat preservation rate (Q) of the sample:

In the formula: Q - heat preservation rate, %; Q ₀ - heat dissipation of sample test plate, W/°C; Q _a - heat dissipation of test plate with sample, W/°C. Among them, the heat preservation rate is the percentage of the ratio of the difference between the heat dissipation without a sample and the heat dissipation with a sample to the heat dissipation without a sample. Before starting the test, a blank test must be carried out first, and the temperature of the test board, protection board, and bottom board should be set at 36°C. The original lining and the improved lining should be placed under the specified standard atmospheric conditions and adjusted for 24 hours. Then take 3 pieces of the original inner lining and the improved inner lining respectively, the size is 30cm×30cm, and it is required to be smooth and wrinkle-free. After a period of preheating, wait for the temperature of the test board, protection board, and base board to reach the set temperature and start officially.

Results: The heat retention of fabrics is a characterization of the thermal conductivity of fabrics, and its effective characterization parameters are Cro value, heat retention rate and thermal resistance. Figures 23(a) to 23(c) show that the Cro value of the original sample polyester cotton felt insulation batt is 3.18, the thermal resistance is 2.02m ² ·K/W, and the heat preservation rate is 75.86. The Cro value of medical crimped hollow polyester is 24.34, the thermal resistance is 2.65m ² ·K/W, and the thermal insulation rate is 80.13. The Cro value of the electromagnetic shielding thermal insulation lining is 45.22, the thermal resistance is 2.83m ² ·K/W, and the thermal insulation rate is 83.55. Visible thermal insulation performance, 3AM thermal insulation lining > medical crimped hollow polyester > original sample polyester cotton felt insulation wadding. Because compared with the ordinary polyester cotton felt of the original sample, the cavity of medical crimped hollow polyester can effectively store still air and block heat release. Still air has the least thermal conductivity, and the more air that is held in the fabric, the better the fabric will retain warmth. The medical crimped hollow polyester has a small thickness and a small air layer between the fabrics, while the improved 3AM thermal insulation cotton has a light weight per square meter, but the thermal insulation cotton is soft and thick, and maintains a certain thickness of the air layer. Therefore, 3AM thermal insulation cotton has the best thermal performance.

According to GB/T 11048-1989, the thermal insulation rate of thermal insulation flakes is 71.1%, and the thermal insulation rate of electromagnetic shielding thermal insulation lining is 81.8%, which is an increase of 15% compared with the same period of last year. It can be seen that the electromagnetic shielding thermal insulation lining has good thermal insulation performance. At the same time, the weight per square meter of thermal insulation flakes and 3AM thermal insulation cotton is 341.2g/m ² and 188.6g/m ² respectively. From the perspective of field convenience and practical thermal insulation, the electromagnetic shielding thermal insulation lining prepared by the present invention is lightweight Good thermal insulation performance, showing great advantages.

Example 9

In some embodiments of the present invention, a test experiment for burst pressure resistance performance of an air column tubular fabric is provided.

Using the HG/T 2580-2008 standard, the sample is stretched at a constant tensile speed until it breaks, and the force applied to stretch the sample to break and the corresponding elongation of the sample are recorded. The maximum force is the highest force recorded when the specimen is stretched to the breaking point. Elongation is the increase in the length of the sample expressed in length units cm or mm, and the elongation expressed as a percentage of the nominal gauge length. The breaking force is the tensile force recorded at the moment of breaking. The nominal gauge length is the length of the specimen measured between the grips of the grips at the specified starting position of tension during the test. The elongation at maximum force is the elongation of the specimen due to the application of the maximum force (see Figure 1). The tension is maintained at a constant rate during the test so that the length of the specimen increases uniformly over time. During the test, it should be noted that the error of the maximum force indicated or recorded at any point within the machine’s operating range should not exceed ±1%, and the error of the indicated or recorded clamp spacing should not exceed 1mm. In the first 2s of the test, the speed of distance increase between the grippers was uniform, and the error was within 5%. The center point of the two clamps of the machine is on a stretch line, the front edge of the clamp should be at right angles to the stretch line, and its clamping surface should be on the latter plane. The grips hold the specimen so that it does not slide. For the grab test method, the dimensions of one grip on each gripper shall be (25 ± 0.5) mm × (25 ± 0.5) mm. When installing the sample, set the test fixture spacing to (200 ± 1) mm. It can also be set to (100±1) mm according to the sample situation. Hold the specimen in fixed grips so that its longitudinal axis passes through the center of the front edge of each grip. When the specimen is mounted under pretension, check that the elongation produced by the pretension does not exceed 5%. For each sample, record the maximum force and breaking force of five samples in the longitudinal and transverse directions, and calculate the average value of the maximum force and breaking force in each direction. Round the average of the maximum force and the breaking force to 1N or 1% of the calculated value. Record the elongation under the maximum force of each of the five samples in each direction, accurate to 1 mm, and record the elongation at break. When pretension is applied, the values of elongation at maximum force and elongation at break are expressed as a percentage of the distance between the clamps (200 mm or 100 mm), or as a percentage of the nominal gauge length. Obtain the pretension value from the point on the stress-strain curve where the transition from "relaxed" to "tensile" is corrected for the initial gauge length of the relaxedly mounted specimen. The average value of elongation at maximum force and elongation at break is calculated. Through the thin-walled cylinder theory, the bursting pressure is represented by the fracture strength. For a thin shell, it has a continuous geometric surface, the external load is continuous, the boundary support is free, and the bending stress in the shell is related to the tension or tension of the middle surface. Compared with the compressive stress, it is so small that it can be ignored. It is considered that the external load of the shell is only balanced by the stress of the middle plane. Calculate according to the following formula: P=2σt/D; σ=F/S; S=tL; P=2F/LD, where, P--burst pressure; σ--fracture strength; t--thickness of sample strip ; S--the cross-sectional area of the sample strip; L--the cross-sectional width of the sample strip; D--the inner diameter of the air column.

Results: At present, the warp tensile strength of the tent air column in the tent is 2908N, and the weft tensile strength is 1966N. After calculation, the burst pressure resistance in the warp direction is 1.79MPa, and the burst pressure resistance in the weft direction is 1.21MPa. The texture density of the thread and the amount of TPU coating, the tensile strength in the warp direction is 2750N, and the tensile strength in the weft direction is 5050N. After calculation, the burst pressure resistance in the warp direction is 1.1MPa, and the burst pressure resistance in the weft direction is 2.02MPa (see figure 24), all meet the requirements of HG/T 2580-2008 standard. Compared with the active tent air column samples in the current tents, the TPU-coated polyester has no obvious changes in the fabric surface after repeated bending, and the anti-shock explosion pressure has not decreased significantly, and it meets the requirements of the HG/T 2580-2008 standard.

Example 10

In some embodiments of the present invention, an experiment for testing the wear resistance of the base fabric is provided.

Using the GB/T 21196.2-2007 standard, determine the total number of frictions according to the damage of the sample, record the number of frictions accumulated before the sample is damaged, that is, the number of abrasions, and determine the wear resistance of the fabric. The circular sample installed in the sample holder of the Martindale Abrasion Tester, under the specified load, rubs against the abrasive with the plane movement of the track as the Lissajous figure, and the sample holder can be wound around it and The axis vertical to the horizontal plane is free to rotate. Determine the total number of frictions according to the damage of the sample, record the number of frictions accumulated before the sample is damaged, that is, the number of abrasions, and determine the abrasion resistance of the fabric. Before sampling, place the sample on a smooth, air-ventilated plane in a relaxed state, at least 100mm away from the edge of the cloth, and cut a sufficient number of samples from the entire laboratory sample, generally at least 3 pieces. For woven fabrics, each sample taken shall contain different warp or weft yarns.

Results: There is a huge difference in the wear resistance of the coated fabrics of different materials, and the friction times when the fabrics are damaged are quite different. The PU coating provides effective protection to the fabric against abrasive movements, whereas the untreated fabric suffers greater wear and tear. Among them, the cotton-PMMA coating and cotton-PA coating were damaged after about 700 frictions, the polyester-PMMA coating was damaged after about 1000 frictions, and the polyester-PA coating was damaged after about 5000 frictions. The original base fabric was damaged after being rubbed 70 times. When the improved sample with PU coating is worn more than 150,000 times, it will be damaged. Compared with the original and other samples, the wear resistance of the improved base fabric is greatly improved. Compared with the 70 wear times of the current tent sample base fabric, the improved PU coating has more than 150,000 times of wear resistance, so the improved PU coating has more advantages in practical applications.

Further, the present invention selects TPU-coated aramid fiber composite fabric as the outer cover material of the air column tent, including: an outer layer, an interlayer and an inner layer. The outer layer is a TPU-coated aramid fabric. The aramid fiber has a high specific strength, which is 5-6 times that of steel, a modulus that is 2-3 times that of steel, and a toughness that is 2 times that of steel. The weight is only 1/5 of steel, and aramid fibers are flame-retardant fibers, so they will not burn in the air, do not support combustion, and are self-extinguishing. At the same time, aramid fiber has long-lasting thermal stability. The most prominent feature of aramid fiber is high temperature resistance, and it can be used for a long time at 220°C without aging. These properties greatly enhance the service life of the tent. The interlayer is a silver-plated yarn knitted fabric such as antibacterial, decontamination-resistant, and anti-electromagnetic shielding. The single fiber of the silver-plated polyester mesh synthetic fiber is uniform in thickness, and has the characteristics of high strength, light weight, and good elasticity. Compared with active tents, the silver-plated polyester mesh is light in weight and reduces the overall weight of the tent. The inner layer is a thermal insulation layer, which uses 3.0-5.0mm synthetic fiber cotton. From the perspective of field convenience and practical thermal insulation, the thermal insulation lining shows great advantages in light weight and thermal insulation, and its weight is also optimized. The base fabric is made of PU ester-coated polyester canvas, which is also lighter than the base fabric of active tents.

In some embodiments of the present invention, the grammage per square meter of the outer tarpaulin in the current tent is 265g/m ² , the grammage per square meter of the inner lining is 341.2g/m ² , the grammage per square meter of the base fabric is 573g/m ² , and the gas The grammage per square meter of a column is 1860g/m ² , and the overall grammage of the tent is 3039.2g/m ² . The weight of the outer tarpaulin in the improved sample is 473g/m ² , the inner lining is 296.8g/m ² , the ground cloth is 175g/m ² , and the air column is 1550g/m 2 m ² , the overall grammage of the improved tent material is 2494.8g/m ² . Compared with the current tent, the total weight of the improved sample is reduced by 17.9%. The comparison parameters are shown in Table 4:

Table 4 Weight comparison between the original tent material and the improved sample

As can be seen from the embodiments of the present invention, the decontamination-resistant electromagnetic shielding tent of the present invention adopts thermoplastic polyurethane TPU to have excellent wear resistance, corrosion resistance and strong adhesion, and the polyurethane coating film is non-toxic after curing. An elastomer material that can be combined with various substrates; after the composite design with the fabric, the outer layer of the outer tarpaulin has tear resistance in addition to the flame retardant properties of aramid itself; the inner layer is in the insulation layer and electromagnetic Under the good structural design of the shielding functional layer, it has good antibacterial performance against Escherichia coli, Candida albicans and Staphylococcus aureus, and the lining still has excellent antibacterial performance after washing, and the average electromagnetic shielding performance at 0-3000MHz reaches 65dB ; The breaking strength of the air column fabric is greater than 5000N in the horizontal and vertical directions; the base fabric has good wear resistance.

Compared with traditional pole-type and frame-type tents, the tent of the present invention has properties such as puncture resistance, tear resistance, heat preservation, antibacterial, electromagnetic shielding and decontamination resistance, and can be used as a tent for many purposes such as outdoors.

Furthermore, the present invention develops a fabric with tear resistance, shock resistance, antibacterial, and decontamination resistance as the main performance, and anti-electromagnetic shielding, wind resistance, blast pressure resistance, and wear resistance as auxiliary performances through the composite design of multi-layer fabrics. New materials for tents. Using high-strength aramid fabric as the main material of the outer tarpaulin, by changing the weight of the fabric and the TPU coating method, the tear resistance (≥5000N) is improved by no less than 100% compared with the existing tent and the anti-blast impact performance (Dynamic puncture resistance performance ≥ 259.96N) Improved outer tarpaulin with no less than 200% improvement; PU-coated polyester canvas is used as the main material of the base fabric to obtain an excellent wear-resistant base fabric; by changing the self-made electromagnetic shielding lining material The parameters of species, gram weight and silver plating have obtained an improved inner lining whose antibacterial performance (≥98%) has been improved by no less than 300% and decontamination resistance (≥10 times) has been improved by no less than 100%; by changing the air The warp and weft density of the columnar polyester fabric was improved to obtain an improved air columnar fabric with resistance to bursting pressure. The main performances of the improved multi-functional awning, such as tear resistance, anti-blast impact, antibacterial, and decontamination resistance, are significantly improved. Accessibility has also been significantly improved. At the same time, the overall material weight of the improved air column tent is 17.9% lower than that of the active tent.

The above are only examples of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention will occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present application.

Claims (10)

1. A washable and anti-fading electromagnetic shielding tent which is characterized in that,

the washable and washable electromagnetic shielding tent comprises an outer tent material, an electromagnetic shielding heat-insulating lining, an air column fabric and a base fabric from inside to outside;

the upper part of the air column fabric is tarpaulin consisting of an outer tent material and an electromagnetic shielding lining; a base fabric is arranged below the base fabric;

the outer covering material comprises aramid fabric;

the electromagnetic shielding heat-insulating lining comprises electromagnetic shielding heat-insulating cotton;

the air column fabric comprises a terylene air column fabric;

the base fabric comprises a terylene base fabric.

2. The washable, dissipative electromagnetic shielding tent of claim 1, wherein said outer tent material is prepared by:

s11, carrying out alkali cooking on the aramid fiber fabric to remove oil;

s12, placing the coated TPU solution in a blade coater to be coated;

s13, after being uniformly coated, placing the coating in an oven for drying;

and S14, turning over to obtain the outer tent material.

3. The washfastness electromagnetic shield tent of claim 1,

the electromagnetic shielding heat preservation cotton comprises an outer layer with an electromagnetic shielding function and a heat preservation lining;

the outer layer with the electromagnetic shielding function and the heat-insulating lining are combined in a mechanical sewing mode.

4. The wash-durable electromagnetic shielding tent of claim 1,

the preparation of the terylene air column fabric comprises the following steps:

s21, placing the polyester fabric on a blade coating machine;

s22, coating a TPU-containing solution on the polyester fabric;

s23, after being uniformly coated, placing the coating in an oven to form a TPU layer uniformly coated;

and S24, turning over, and then performing the operations of S21-S23 to obtain the terylene air column fabric.

5. The wash-durable electromagnetic shielding tent of claim 1,

the preparation of the terylene base fabric comprises the following steps:

s31, arranging the polyester sails on a blade coating machine;

s32, coating the solution containing PU on the polyester canvas;

s33, after being uniformly coated, the PU coating is placed in an oven to be dried for 1 to 5 hours at the temperature of between 20 and 80 ℃ to form a uniformly coated PU coating;

s34, turning over, and then carrying out the operations S31-S33 to obtain the terylene base cloth.

6. The washfastness electromagnetic shield tent of claim 1,

the preparation of the terylene base fabric comprises the following steps:

s41, arranging the polyester sails on a blade coating machine;

s42, coating the polyester canvas with a PU-containing solution;

s43, after being uniformly coated, the PU coating is placed in an oven to be dried for 2 to 4 hours at the temperature of between 50 and 70 ℃ to form a uniformly coated PU coating;

and S44, turning over, and then performing the operations S41-S43 to obtain the terylene base fabric.

7. Washable, dissipative electromagnetic shielding tent according to claim 5 or 6, wherein said polyester canvas is dark colored, preferably black.

8. The washable, washable and washable electromagnetic shielding tent of claim 3, wherein the electromagnetic shielding and heat insulating lining is self-made.

9. The electromagnetic shielding tent of claim 1, wherein the total weight of the electromagnetic shielding tent is 1000g/m ² ～5000g/m ² 。

10. The electromagnetic shielding tent of claim 1, wherein the total weight of the electromagnetic shielding tent is 2000g/m ² ～3000g/m ² 。

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