CN109023928A - A kind of preparation method of antibacterial anti-UV fabric - Google Patents

Abstract

The present invention relates to a kind of preparation methods of antibacterial anti-UV fabric, by fabric be impregnated in aloe Ag doping ZnO sol-gel liquid in by padding machine removal excessive moisture after through preliminary drying, bake it is obtained, the preparation of the aloe Ag doping ZnO sol-gel liquid includes the following steps, S01: prepares extract solution from aloe；S02: zinc nitrate solution is added dropwise into extract solution from aloe and obtains the first mixed solution；S03: being slowly added dropwise ammonia spirit into the first mixed solution, is added dropwise to complete rear agitating solution, obtains the second mixed solution；S04: after the second mixed solution is protected from light, being added silver nitrate solution and stir, and obtains aloe Ag doping ZnO sol-gel liquid.The present invention is using aloe as the medium for preparing nanocomposite, and single bath process prepares environment-friendly type aloe silver doped zinc oxide nano composite material for the first time, by textile finishing, disposably assigning and improving antibacterial fabric deodorization and uvioresistant ability.

Description

A kind of preparation method of antibacterial anti-ultraviolet fabric

technical field

The invention relates to a method for preparing a fabric, in particular to a method for preparing an antibacterial and anti-ultraviolet fabric.

Background technique

With the continuous innovation of science and technology, the continuous improvement of living standards, and the continuous diversification of market demand, people's requirements for textiles are no longer limited to the original basic characteristics such as warmth and comfort. Functional textiles such as antibacterial, anti-ultraviolet, moisture-wicking, oil-proof and waterproof have emerged as the times require. Especially in today when healthy sports are regarded as the wind vane, more and more people join in sports. However, it is easy to produce sweat when exercising outdoors, which makes the sebaceous glands secrete a large amount. Under a suitable temperature and humidity environment, it is easy to cause a large number of microorganisms to multiply, which poses a certain threat to the human body; Cause skin cancer. Therefore, the one-bath method endows the fabric with antibacterial and anti-ultraviolet dual functions to meet the market demand, which is of great significance.

In the textile field, nanocomposites can be applied to the textile field to endow the fabric with multifunctionality, increase the added value of the fabric, and meet the antibacterial and anti-ultraviolet requirements of the fabric.

Contents of the invention

The purpose of the present invention is to provide an antibacterial, deodorant and anti-ultraviolet fabric that combines the excellent properties of green and nano materials to enhance the protective effect of the fabric on human health. In textile finishing, using aloe vera as the medium for preparing nanocomposites, the first one-bath method is used to prepare environmentally friendly aloe vera silver-doped zinc oxide nanocomposites. By finishing the fabric, it can endow and improve the antibacterial, deodorizing and anti-ultraviolet capabilities of the fabric at one time. It is of great significance to protect human health.

The technical scheme adopted in the present invention is: a preparation method of antibacterial and anti-ultraviolet fabric, which is obtained by immersing the fabric in an aloe Ag-doped ZnO sol-gel solution, removing excess water by padding, and then pre-baking and baking. The preparation of the Aloe Ag doped ZnO sol-gel solution comprises the following steps

S01 preparing the aloe extract: ultrasonically processing the aloe to extract the aloe extract;

S02 dripping zinc nitrate solution into the aloe extract to obtain the first mixed solution;

S03 Slowly add ammonia solution dropwise to the first mixed solution, and stir the solution after the dropwise addition is completed to obtain a second mixed solution;

S04 After the second mixed solution is protected from light, silver nitrate solution is added and stirred to obtain the Aloe Ag doped ZnO sol-gel solution.

Further, the fabric is immersed in the aloe Ag doped ZnO sol-gel solution with a bath ratio of 1:30-1:50.

Further, the fabric is bleached pure cotton fabric.

Further, the impregnation method adopts a two-dipping and two-rolling process. The two-dipping and two-rolling process is to immerse the fabric in the aloe nano-Ag doped ZnO sol-gel solution for 3 to 7 minutes, and then use a rolling machine to remove excess water. After that, the fabric is placed again. Put it into the aloe nano-Ag doped ZnO sol-gel solution, and use a rolling machine to remove excess water after soaking for 3-7 minutes.

Further, after the first padding treatment, the liquid carrying rate of the fabric is 160%-180%.

Further, after the second padding treatment, the liquid carrying rate of the fabric is 160%-180%.

Further, the pre-baking temperature is 80° C. to 90° C., and the pre-baking time is 2 min to 5 min.

Further, the baking temperature is 120° C. to 150° C., and the baking time is 2 to 5 minutes.

Further, both the prebaking and baking are carried out in a heat setting machine.

Further, in the step S01, an orthogonal experimental method is used to perform ultrasonic treatment on the aloe, the ultrasonic treatment time is 1-5 minutes, the ultrasonic frequency is 40-60HZ, the ultrasonic interval is 1-8s, and the liquid-to-material ratio is 1-5 minutes. 3:1.

The beneficial effects produced by the present invention include:

The preparation principle of aloe nano-silver: using the chemical reduction method, using aloe liquid as a reducing agent and capping agent, silver nitrate and ammonia water react to form silver-ammonia solution, and silver-ammonia ions generate nano-silver in the reducing agent aloe liquid. See formula 1 for the principle ,2.

AgNO ₃ +3NH ₃ ·H ₂ O→[Ag(NH ₃ ) ₂ ]OH+NH ₄ NO ₃ +2H ₂ O (Formula 1)

2Ag(NH ₃ ) ⁺ +aloe vera+2OH ^- →2Ag↓+2NH ₂ ↑+2H ₂ O (Formula 2)

The main ingredients of aloe vera extract are as follows:

Aloe Vera's all-natural organic chemistry acts as a stable, green synthetic medium. This synthesis method is undoubtedly a kind of green chemistry that is beneficial to environmental protection.

Nano-silver utilizes its own strong photocatalytic ability to form freely moving negatively charged electrons and positively charged holes under ultraviolet irradiation. The holes can react with O ₂ , H ₂ O, etc. on the surface of the fabric to generate Active oxygen ions can stimulate the oxygen in the air and water to become active oxygen. Active oxygen can react with a variety of organic microorganisms to destroy bacteria and play a bactericidal role. Nano silver has excellent antibacterial properties.

See the formula and structural formula for the preparation principle of nano-zinc oxide:

Zn(NO ₃ ) ₂ +NH ₃ ·H ₂ O→Zn(OH) ₂ +NH ₄ NO ₃ (Formula 3)

Zn(NO ₃ ) ₂ +2H ₂ O→Zn ²⁺ +2OH ^- +2H ₂ O→Zn(OH) ^2- ₄ +2H ⁺ (Formula 4)

Zn(OH) ^2- ₄ →ZnO+H ₂ O+2OH ^- (Formula 5)

When using the sol-gel method to prepare nano-zinc oxide, the aloe extract is used as a capping agent and reducing agent, and the alkali agent is gradually added dropwise. Zinc precursor Zn(OH) ₄ ^2- , under high temperature conditions, the precursor gradually transforms into nanometer zinc oxide.

Nano-zinc oxide has obvious anti-ultraviolet effect on fabrics. The particle size of nano-zinc oxide is smaller than the wavelength of ultraviolet rays, so it has a strong ability to absorb ultraviolet rays.

Description of drawings

Fig. 1 zinc nitrate concentration influences the anti-ultraviolet performance of fabric;

Fig. 2 Effects of original fabric and different concentrations of zinc nitrate on the antibacterial properties of fabrics;

The influence of Fig. 3 silver nitrate concentration on the anti-ultraviolet performance of fabric;

The influence of Fig. 4 different silver nitrate concentrations on the antibacterial properties of fabrics;

The influence of Fig. 5 baking temperature on the anti-ultraviolet performance of fabric;

Fig. 6 Effects of different baking temperatures on the antibacterial properties of fabrics;

Fig. 7 scanning electron micrographs of fabrics treated with different finishing liquids;

Fig. 8 pure cotton fabric X-diffraction pattern;

Figure 9 X-diffraction patterns of fabrics finished with different sol-gel treatment solutions

Fig. 10 is the thermogravimetric analysis chart of fabrics treated with different finishing liquids.

Detailed ways

The present invention will be further explained in detail below in conjunction with specific examples, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

The preparation method of antibacterial anti-ultraviolet fabric among the present invention comprises the following steps:

1. Extraction of Aloe Vera

Prepare 20g of aloe meat, and use the orthogonal experimental method to ultrasonicate the aloe. The specific factors and levels are shown in Table 1.

Table 1 Orthogonal factor level table

2. Aloe Ag doped ZnO sol-gel preparation

Prepare a certain concentration of zinc nitrate solution and silver nitrate solution respectively (avoid light in the dark). Accurately measure 8mL of ammonia solution with a concentration of 25%-28%, dilute it in a 100mL volumetric flask, and prepare it as ammonia water with a concentration of 2%.

Pipette 10 mL of zinc nitrate solution and add it to the ultrasonically treated aloe extract, take 23 mL of 2% ammonia solution and slowly drop it into the aloe extract for half an hour. After the addition is completed, stir for 1 h. Then, the aloe finishing agent was protected from light, 10 mL of silver nitrate solution was added, and the stirring was continued for 1 hour to obtain the aloe silver doped zinc oxide sol-gel solution.

3. Fabric functional finishing

Aloe Ag-doped ZnO sol-gel solution→weigh 2g of fabric and put it into the aloe sol-gel solution (bath ratio 1:30)→two soaking and two rolling (immersion for 5min)→pre-drying (80℃, 3min) → Baking (130°C, 5min).

Specifically: put in according to the bath ratio of 1:30 ~ 1:50, measure the self-made aloe nano Ag doped ZnO sol-gel solution, weigh about 2g of bleached cotton fabric and put it into the aloe nano Ag doped ZnO sol-gel solution. Immerse in the gel liquid for 5 minutes, and remove excess water by padding, so that the liquid carrying rate of the fabric is 160% to 180%. Moisture, the liquid carrying rate is still 160% to 180%, which is called two-dipping and two-rolling. Bake in a heat setting machine at 80°C to 90°C for 2min to 5min, dry the fabric to remove moisture, then heat up the heat setting machine to 120°C to 150°C, and bake at a high temperature for 2 to 5min, so that the nano-zinc oxide precursor is at a high temperature At the same time, the aloe vera nano-Ag doped ZnO sol-gel solution is cross-linked to form a film on the surface of the fabric, and is fixed on the surface of the fabric. Liquor ratio refers to the ratio of fabric weight to gel liquor volume.

Fabric Performance Testing

The fabric performance test adopts the following test methods to comprehensively evaluate the fabric performance.

1. Fabric UV protection performance test

Prepare the fabric to be tested, turn on the power of the textile UV performance tester, and calibrate the system. After the instrument is warmed up for 10 minutes, the radiation intensity of the blank UV ray is detected. After the first test is completed, put the fabric above the sealing hole inside the measuring instrument to keep the surface of the fabric flat and wrinkle-free, and press the fabric with a metal ring to avoid obstructing the light. Then start the test, save the data, and calculate the UPF value of the fabric through formula 1.

In the formula: E _λ ----------- sunlight spectral irradiance, the unit is watts per square meter nanometer (W·cm ^-2 ·nm ^-1 );

S _λ ------------relative erythema effect;

Tλ ----------- Spectral transmittance of the sample at λ wavelength;

Δλ----------Wavelength interval, the unit is nanometer (nm).

2. Antibacterial performance test of fabric

According to AATCC Test Method 90-2011, the antibacterial test of fabrics. Pour 15mL of sterilized nutrient agar medium into a standard petri dish and wait for it to cool and condense. Use a sterile pipette to take 0.1 mL of the bacterial solution and put it on the plate, spread the bacterial solution evenly on the plate with a sterile glass coating rod as soon as possible, and place it on the test bench for 20-30 minutes to allow the bacterial solution to penetrate into the surface of the medium. Press the fabric (15 mm in diameter) evenly on the surface of the agar with sterile tweezers in a petri dish, and press gently to make the fabric and the agar surface fully contact. After placing the sample on the agar medium, immediately place it in an incubator at 37°C±2°C for 18h to 24h, and ensure that the sample and the agar medium remain in contact throughout the culture period. The area where there is no bacterial growth at the boundary between the surface of the agar medium and the sample is called the bacteriostatic zone, and the width of the bacteriostatic zone of the sample is calculated according to formula (7), and at least 3 places are measured for each sample. The formula is as follows.

H＝(T-D)/2 (Formula 7)

In the formula: H—the width of the antibacterial zone, in millimeters (mm);

T—the diameter of the antibacterial zone and the fabric sample, in millimeters (mm);

D—the diameter of the fabric sample, in millimeters (mm).

3. SEM test

The finished fabric was tested on a QUANTA200 scanning electron microscope, and the sample was characterized by SEM with an accelerating voltage of 200kV.

4. Spectrum

The XSAM800 multifunctional surface electron spectrometer from KRSTOS Company in the UK was used for testing. Experimental conditions: MgKa (1256.4ev) X-ray source, power 12KV×15mA, analyzer using high power, FAT mode, analysis chamber vacuum 1×10-7 , combined with energy values to correct pollution carbon C1s (BE = 284.8ev).

5. X-diffraction test

The test was completed on Bruker D8Advance in Germany. The light tube voltage was 40KV, the tube current was 40MA, the step size was 0.02°, and the test speed was 0.1sec/step. The product was characterized by X-ray diffraction.

6. Thermogravimetric analysis

Instrument: STA449C thermal analyzer.

Test conditions: heating rate 10°C/min, N ₂ , room temperature -700°C, flow rate 20mL.

Test Results

1. Orthogonal test analysis

Table 2 Analysis table of ultrasonic orthogonal experiment results

Ultrasound propagates around through the liquid medium. When the sound energy is high enough, the attraction force between liquid phase molecules is broken to form a cavitation nucleus. The cavitation nucleus can generate a local high temperature and high pressure environment at the moment of explosion, and produce a micro jet with strong impact. Then the point is cooled, the cooling rate reaches 109K/s, accompanied by a powerful shock wave in the liquid, the water molecules reach a supercritical state at the hot spot, and decompose into hydroxyl radicals, superoxygen, etc. These conditions are sufficient to cause chemical bond breakage, water phase combustion, pyrolysis or free radical reaction of organic matter in cavitation bubbles, creating an extreme physical environment for the degradation of organic matter. It can be seen from Table 2 that the range corresponding to the liquid-material ratio is the largest, and the liquid-material ratio has the greatest influence on the solid content of the aloe liquid, while the range corresponding to the ultrasonic time interval is the smallest, indicating that it has little influence on the solid content of the aloe liquid.

2. Effect of single factor on fabric performance

The best scheme obtained by orthogonal test was used to prepare aloe extract, and the fabric was functionally finished under certain conditions, and the effects of zinc nitrate concentration, silver nitrate concentration and baking temperature on the anti-ultraviolet and antibacterial properties of the fabric were investigated.

2.1 Effect of zinc nitrate concentration on fabric properties

2.1.1 The effect of zinc nitrate concentration on the UV resistance of fabrics

Control the silver nitrate concentration, ammonia water and other factors to be constant, change the zinc nitrate concentration to prepare aloe sol-gel liquid, finish the function of the fabric, and measure the anti-ultraviolet performance of the fabric. The curves are shown in Figure 2-3. When the aloe sol-gel solution is prepared by adding only 23mL ammonia water and 0.118mol/L silver nitrate, and no zinc nitrate is added, the UPF value of the fabric reaches 100+. As the concentration of zinc nitrate increases, the UPF value of the fabric gradually increases.

Nano-zinc oxide has obvious anti-ultraviolet effect on fabrics. The particle size of nano-zinc oxide is smaller than the wavelength of ultraviolet rays, so it has a strong ability to absorb ultraviolet rays. When the concentration of zinc nitrate reaches 0.08mol/L, UPF reaches the highest value of 156. 2.1.2 The effect of zinc nitrate concentration on the antibacterial properties of fabrics

Figure 2 is the effect of original cloth and different concentrations of zinc nitrate on the antibacterial properties of fabrics. In the figure 1: original cloth; 2: fabric treated with aloe extract; 3: fabric treated with aloe nano-silver sol-gel; 4-8: nitric acid respectively Aloe sol-gel solution treated fabrics with zinc concentrations of 0.06mol/L, 0.02mol/L, 0.04mol/L, 0.08mol/L, 0.1mol/L; D: Escherichia coli, J: Staphylococcus aureus.

Staphylococcus aureus (S.aureus) is a gram-positive bacterium, and Escherichia coli (E.coli) is a gram-negative bacterium, which are typical pathogenic bacteria. It can be seen from Figure 2 that the original cloth has no antibacterial properties, and the surrounding area of the original cloth is still covered with bacteria. The antibacterial effect of fabric 2 treated only with aloe extract plus ammonia water was almost zero. The fabric 3 treated with aloe extract, ammonia water and silver nitrate has obvious antibacterial effect, which shows that the antibacterial property of nano silver is better. According to the antibacterial mechanism of nano-silver: nano-silver uses its own strong photocatalytic ability to form freely moving negatively charged electrons and positively charged holes under ultraviolet irradiation, and the holes can interact with O ₂ and H ₂ on the surface of the fabric. O, etc. react to generate active oxygen ions with reducing effect, which can stimulate the oxygen in the air and water to become active oxygen. Active oxygen can react with various organic microorganisms to destroy bacteria and play a bactericidal effect. Fabrics 4, 5, 6, 7, and 8 are fabrics finished with aloe sol-gel solutions with different concentrations of zinc nitrate. Table 3 shows the width data of the bacteriostatic zone of the sol-gel finished fabrics with different concentrations of zinc nitrate. It can be seen from Figure 2 and Table 3 that when the concentration of zinc nitrate reaches above 0.08mol/L, the antibacterial performance of the fabric increases slightly and remains basically unchanged.

Table 3 different zinc nitrate concentrations on fabric antibacterial performance data

Note: D: Escherichia coli; J: Staphylococcus aureus

2.2 Effect of silver nitrate concentration on fabric properties

2.2.1 Effect of silver nitrate concentration on fabric UV resistance

Figure 3 is the effect of silver nitrate concentration on the UV resistance of the finished fabric. As the silver nitrate solution increases, the UPF value of the fabric shows an upward trend. When the silver nitrate concentration is greater than 0.08mol/L, the UPF reaches a lower increase rate and basically tends to balance.

2.2.2.2 Effect of silver nitrate concentration on the antibacterial properties of fabrics

Figure 4 is the effect of different silver nitrate concentrations on the antibacterial properties of fabrics. Fabrics 1-5 in the figure represent the silver nitrate concentrations of 0.04moL/L, 0.06moL/L, 0.08moL/L, 0.11moL/L, and 0.13moL/L respectively. Aloe silver-doped nano-zinc oxide sol-gel solution treated fabric; 6 means that in the preparation, the concentration is 0.11mol/L silver nitrate and then the concentration is 0.08mol/L zinc nitrate Aloe sol-gel solution treated fabric ; D indicates Escherichia coli, J indicates Staphylococcus aureus.

The data table of different silver nitrate concentrations of table 4 to fabric antibacterial performance

Note: D: Escherichia coli; J: Staphylococcus aureus

Aloe sol-gel was prepared with different concentrations of silver nitrate for antibacterial finishing of fabrics. As shown in Figure 4, the antibacterial performance of the finished fabric is superior. The colors of fabrics 4, 5, and 6 in the figure are brownish, indicating that there are relatively more nano-silver on the fabric, and from the data analysis of the width of the antibacterial zone in Table 4, the increase in the concentration of silver nitrate does not significantly improve the antibacterial performance of the fabric. At the same time, the aloe sol - The bacteriostatic effect of the gel on Staphylococcus aureus is better than that on Escherichia coli.

2.3 Effect of baking temperature on fabric properties

2.3.1 The effect of baking temperature on the UV resistance of fabrics

Figure 5 is the effect of baking temperature on the UV resistance of fabrics. Aloe sol-gel was prepared under the conditions of zinc nitrate concentration and silver nitrate concentration of 0.08mol/L, and the effect of changing the baking temperature on the functional finishing of fabrics in one bath method (Figure 5) . As the baking temperature increases, the UPF value of the fabric increases, mainly because the precursor Zn(OH) ^2- ₄ in the sol-gel can form nano-ZnO above 125 ° C, and nano-ZnO can pass through the valence band on the one hand. The electrons accept the energy in the ultraviolet to make a transition to achieve the anti-ultraviolet effect. On the other hand, the size of the nanomaterial is much smaller than the wavelength of the ultraviolet. The ions can scatter the ultraviolet on it to all directions, reducing the intensity of the ultraviolet in the irradiation direction. Through the scattering The principle is to achieve the effect of anti-ultraviolet. However, if the temperature is too high, it will destroy the substance of aloe itself, which will reduce the ultraviolet effect of the fabric.

Figure 6 shows the effect of different baking temperatures on the antibacterial properties of fabrics. Fabrics 1-5 in the figure: respectively, after being treated with aloe sol-gel liquid prepared under the optimal process conditions, the baking time was 120°C, 130°C, Fabrics at 140°C, 150°C, and 160°C; D means Escherichia coli, J means Staphylococcus aureus.

The data of different curing temperatures in table 5 on the antibacterial properties of fabrics

Note: D: Escherichia coli; J: Staphylococcus aureus

Figure 6 and Table 5 reflect the influence of baking temperature on the antibacterial properties of fabrics. From the data in Table 5, it is found that when the baking temperature is 140°C, the width of the fabric's antibacterial zone is the highest, which is basically consistent with the results of the fabric's UV resistance. At the same time, the antibacterial effect of the finished fabric on Staphylococcus aureus was better than that of Escherichia coli.

3. Scanning electron microscope test and energy spectrum analysis

Fig. 7 SEM images of fabrics treated with different finishing solutions, in which A: original fabric; B: fabric treated with aloe extract; C: fabric treated with aloe zinc oxide sol-gel solution; D: fabric treated with aloe nano-silver sol-gel solution ; E: Aloe silver-doped nano-zinc oxide aloe sol-gel solution treated fabric.

It can be seen from the figure that the surface of the fabric treated with aloe vera extract is relatively smooth and flat, and contains C and O elements compared with the original fabric. There are obvious filaments on the surface of fabric fibers treated with aloe extract. Zinc oxide aloe vera sol-gel solution treated fabric contains Zn element. Compared with the original fabric and fabric treated with aloe extract, there are obvious ZnO particles on the surface of the fabric fiber. The ZnO particles in the figure are less than 100nm, indicating that ZnO belongs to the nanometer scale. It shows that the surface of the fabric fiber has nanometer zinc oxide.

Nano-silver aloe sol-gel solution treated fabric contains Ag element in the energy spectrum test. Compared with the fabric treated with aloe extract, the surface of the fabric fiber has obvious non-uniform size particles, indicating that the surface of the fabric fiber also has nano-silver. The fabric treated with aloe silver-doped nano-zinc oxide contains Ag and Zn elements in the energy spectrum test. Compared with the fabric treated with aloe extract, the particles of uniform size on the surface of the fabric fiber can be clearly seen from the E2 diagram, and the particles are far away. It is less than 100nm, indicating that nano-silver and nano-zinc oxide exist simultaneously on the fiber surface of the fabric treated with aloe silver-doped nano-zinc oxide sol-gel solution.

4. X-diffraction

Fig. 8 is the X-diffraction spectrogram of blank cotton fabric. Cellulose has four main crystallization variants, namely cellulose I, cellulose II, cellulose III and cellulose IV, and these variants can be transformed into each other or unidirectionally under certain conditions. In X-ray diffraction, the characteristic diffraction peak positions of cellulose I are: 2θ=14.8°(101), 16.6°(101), 22.7°(002), 34.6°(040). The characteristic absorption peak in Figure 9 is consistent with it.

The X-ray diffractograms of fabrics treated with different sol-gel solutions are shown in Figure 9. Among Fig. 9, B, C, D, E represent only impregnated aloe extract solution fabric; Aloe zinc oxide sol-gel solution impregnated fabric; Aloe nano-silver gel-sol impregnated fabric; Aloe silver-doped zinc oxide sol-gel Dipping fabric.

As can be seen from Figure 9, the characteristic absorption peaks of the cellulose fibers of the fabrics treated with the aloe extract, aloe zinc oxide, and aloe nano-silver sol-gel finishing solution remain basically unchanged at 2θ=14.8° (101 ), 16.6°(101), 22.7°(002), and 34.6°(040) have corresponding absorption peaks, which shows that the crystalline region of the fabric remains basically unchanged after functional finishing. And the fabric treated with aloe silver-doped zinc oxide sol-gel finishing solution, its characteristic absorption peak at 2θ=16.6 ° (101) is not obvious, basically forms a broad peak with 2θ=14.8 ° (101) characteristic absorption peak , indicating that the aloe silver doped zinc oxide sol-gel finishing solution has a certain influence on the crystallization area of the fabric. In the C-E curve in Figure 9, in addition to the characteristic absorption peaks of the basic cellulose fibers, new characteristic peaks appear at about 50°, 60°, and 80°. Curve C has new characteristic absorption peaks at 2θ=47.56°, 63°, and 77.5°. By matching the PDF card with Jade5.0 software, it is found that the new absorption peaks appearing in curve C are consistent with the characteristics of zinc oxide numbered 89-1397 The absorption peaks are basically the same, corresponding to the 102, 103, and 202 crystal planes respectively. Curve D has absorption peaks at 2θ=62.2° and 77.05°, which are basically consistent with the characteristic absorption peaks of nano-silver No. 01-071-4613, and correspond to crystal planes 220 and 311 respectively. The fabric treated with aloe silver doped zinc oxide sol-gel finishing solution also has new absorption peaks on the basis of the characteristic peaks of cellulose fibers, but the absorption peaks are different from curves C and D because zinc oxide and silver resulting from the synergy between them.

5. Thermogravimetric analysis

See Figure 10 for thermogravimetric analysis of aloe nano zinc oxide sol-gel solution-treated fabrics, aloe vera nano-silver sol-gel solution-treated fabrics, and aloe silver-doped nano-zinc oxide sol-gel solution-treated fabrics, in which A: Aloe nano-zinc oxide sol-gel solution treated fabric; B: Aloe nano-silver sol-gel solution-treated fabric; C: Aloe silver-doped nano-zinc oxide sol-gel solution-treated fabric. Calculate the first order derivative of the thermogravimetric curve with respect to the temperature to obtain the DTG curve in Figure 10, which represents the relationship between the rate of change of mass over time (weight loss rate) and temperature.

As can be seen from Figure 10, the TG and DTG curves of aloe nano-zinc oxide sol-gel solution-treated fabrics, aloe nano-silver sol-gel solution-treated fabrics, and aloe silver-doped nano-zinc oxide sol-gel solution-treated fabrics are basically resemblance. It can be seen from the TG curve that at around 100°C, the three curves all have different degrees of weight loss, which is mainly caused by the evaporation of water in the fabric at high temperature. The three curves all drop sharply at around 320°C-380°C, and the weight loss is as high as 70%, indicating that the cellulose macromolecular chains are broken and degraded, resulting in faster weight loss. The pyrolysis temperature of the fabrics treated with three different finishing liquids remained basically the same, indicating that the thermal properties of the fabrics with nano-particles on the fabrics were less affected. From 380°C to 700°C, the three curves tend to be smooth again, and finally stop at 10%, indicating that the three fabrics are completely decomposed below 700°C, and the remaining 10% is residue.

Observing the DTG curves, the maximum decomposition rate temperature of the three fabrics occurs at around 360 °C, indicating that the thermal properties of the fabrics are basically unchanged after different sol-gel treatments.

(1) When the ratio of liquid to material is 1:1, the ultrasonic treatment time is 1min, the ultrasonic frequency is 60HZ, and the ultrasonic interval time is 8s, the solid content of the extract is higher.

(2) When the concentration of zinc nitrate and silver nitrate is 0.08mol/L, and the baking temperature is 140°C, the anti-ultraviolet and antibacterial effect of the fabric is good.

Claims (10)

1. a preparation method of antibacterial and anti-ultraviolet fabric, it is characterized in that: fabric is soaked in aloe Ag doped ZnO sol-gel liquid, removes redundant moisture by paddle after prebaking, baking make, described aloe The preparation of Ag-doped ZnO sol-gel liquid comprises the following steps S01 preparing the aloe extract: ultrasonically processing the aloe to extract the aloe extract; S02 dripping zinc nitrate solution into the aloe extract to obtain the first mixed solution; S03 Slowly add ammonia solution dropwise to the first mixed solution, and stir the solution after the dropwise addition is completed to obtain the second mixed solution; S04 After the second mixed solution is protected from light, a silver nitrate solution is added and stirred to obtain an Aloe Ag-doped ZnO sol-gel solution. 2. The preparation method of the antibacterial and anti-ultraviolet fabric according to claim 1, characterized in that: the fabric is immersed in the aloe Ag doped ZnO sol-gel solution with a bath ratio of 1:30~1:50. 3. the preparation method of antibacterial anti-ultraviolet fabric according to claim 1 is characterized in that: described fabric is the pure cotton fabric after bleaching. 4. the preparation method of antibacterial anti-ultraviolet fabric according to claim 1 is characterized in that: impregnating method adopts two dipping two rolling processes, and described two dipping two rolling processes is fabric doping ZnO sol-gel in aloe nano Ag After immersing in the solution for 3-7 minutes, the excess water was removed by padding, and then the fabric was put into the aloe nano-Ag doped ZnO sol-gel solution again, and after 3-7 minutes of immersion, the excess water was removed by padding. 5. The preparation method of antibacterial and anti-ultraviolet fabric according to claim 4, characterized in that: after the first padding treatment, the liquid carrying rate of the fabric is 160%~180%. 6. The preparation method of antibacterial and anti-ultraviolet fabric according to claim 4, characterized in that: after the second padding treatment, the liquid carrying rate of the fabric is 160%~180%. 7. The preparation method of antibacterial and anti-ultraviolet fabric according to claim 1, characterized in that: the pre-drying temperature is 80°C-90°C, and the pre-drying time is 2min-5min. 8. The preparation method of antibacterial and anti-ultraviolet fabric according to claim 1, characterized in that: the curing temperature is 120°C-150°C, and the curing time is 2-5 minutes. 9. The preparation method of antibacterial and anti-ultraviolet fabric according to claim 1, characterized in that: said pre-baking and baking are carried out in a heat setting machine. 10. The preparation method of antibacterial and anti-ultraviolet fabric according to claim 1, is characterized in that: in described step S01, adopts orthogonal experimental method to carry out ultrasonic treatment to aloe, described ultrasonic treatment time is 1～5min, and ultrasonic frequency is 40~60HZ, ultrasonic interval time is 1~8s, liquid material ratio is 1~3:1.