CN111923509A - Surface moisture-resistant disposable protective clothing fabric and preparation process thereof - Google Patents
Surface moisture-resistant disposable protective clothing fabric and preparation process thereof Download PDFInfo
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- CN111923509A CN111923509A CN202010817510.3A CN202010817510A CN111923509A CN 111923509 A CN111923509 A CN 111923509A CN 202010817510 A CN202010817510 A CN 202010817510A CN 111923509 A CN111923509 A CN 111923509A
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- cloth
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- microporous membrane
- protective clothing
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Images
Classifications
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- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/12—Surgeons' or patients' gowns or dresses
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- A41D31/00—Materials specially adapted for outerwear
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- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/10—Impermeable to liquids, e.g. waterproof; Liquid-repellent
- A41D31/102—Waterproof and breathable
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M17/00—Producing multi-layer textile fabrics
- D06M17/04—Producing multi-layer textile fabrics by applying synthetic resins as adhesives
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- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
- B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
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- Manufacturing Of Multi-Layer Textile Fabrics (AREA)
Abstract
The invention discloses a surface moisture-resistant disposable protective clothing fabric and a preparation process thereof, wherein the fabric comprises a non-woven fabric layer, a hydrophobic coating is coated on the front surface of the non-woven fabric layer, and a modified PTFE (polytetrafluoroethylene) microporous membrane is connected to the back surface of the non-woven fabric layer; the thickness of the modified PTFE microporous membrane is 20-70 mu m, the porosity of the modified PTFE microporous membrane is 25-96%, and the pore diameter of the modified PTFE microporous membrane is 0.18-1.3 mu m; the invention also discloses a preparation process of the protective clothing fabric, which comprises the steps of carrying out hydrophilic modification and heating modification on the PTFE microporous membrane, adjusting the thickness, porosity and aperture of the modified PTFE microporous membrane, spraying nanoscale hydrophobic groups on the front surface of the non-woven fabric, baking, adhering the modified PTFE microporous membrane to the back surface of the non-woven fabric, laminating, curing the coated fabric, and rolling to obtain the finished fabric. The invention can effectively improve the dimensional stability and the lamination uniformity of the microporous membrane in the preparation process, thereby leading the finished fabric to have the characteristics of good protection effect, high yield and good durability.
Description
Technical Field
The invention relates to a protective clothing fabric, in particular to a surface moisture-resistant disposable protective clothing fabric and a preparation process thereof.
Background
With the outbreak of epidemic situation, the production efficiency and the protection effect of the medical protective clothing become the key points of the epidemic situation prevention and treatment work, and the production efficiency and the protection effect are key measures for protecting medical workers from infection. Because the existing fiber fabrics are difficult to achieve the waterproof and liquid-blocking performances required by the standard, the existing protective clothing generally needs to carry out composite lamination or coating finishing on the fabrics during production so as to improve the particle-blocking performance of the fabrics. In order to achieve the required protective performance of protective clothing, the most widespread treatment method at present is to arrange a polytetrafluoroethylene film (PTFE film) on the surface of the fabric; the polytetrafluoroethylene is a high-performance polymer, has high water pressure resistance, and has micropores capable of smoothly discharging sweat steam, so that a PTFE (polytetrafluoroethylene) film prepared by taking the polytetrafluoroethylene as a raw material can effectively block bacteria and viruses after being attached, has good air permeability, and is preferable for improving the protection effect of the fabric.
However, because the PTFE film has the characteristics of smooth surface, low polarity and difficult adhesion, the existing method of directly adhering the PTFE film to the surface of the cloth by lamination has the problem of low peel strength, and the cloth and the PTFE film are easily separated in the subsequent use process. On the other hand, the PTFE membrane can cause the elongation problem along with the conveying of a conventional roller body after being coated with glue, so that the deformation or the elongation of the microporous part of the membrane layer can be caused in the actual bonding process, and the protection effect of the PTFE membrane is influenced; and because the PTFE film used by the protective clothing is thinner, generally within 100 mu m, the elongation effect is easy to cause the tearing of the PTFE film, thereby seriously reducing the yield and the production efficiency of the protective fabric.
In addition, the existing laminating mechanism is limited by the process, so that the shape of the compression roller has the inevitable problem of high and low sides, the compression roller cannot achieve stable compression uniformity in the compression process, the problems that the middle peeling strength of the PTFE film is high and the peeling strength of the two sides of the PTFE film is low after the PTFE film is adhered are caused, and the adhesion stability of the PTFE film is further reduced. On the other hand, the existing laminating mechanism generally adopts an air cylinder as a driving force to realize a laminating effect, and the air cylinder is driven by an air compressor to act; however, since the pressure provided by the conventional air compressor is maintained in the range of 6-8kg, i.e., the air compressor starts pressurizing when the pressure is lower than 6kg, and stops pressurizing when the pressure reaches 8 kg. This results in a pressure difference of 2kg between the press rolls during the continuous pressing process, so that the PTFE film is not constant in the front and back adhesion pressure during the continuous bonding process, further reducing the adhesion stability of the PTFE film.
Therefore, the existing film-covered fabric based on the PTFE film has the problems of poor protective effect, low yield and poor durability.
Disclosure of Invention
The invention aims to provide a surface moisture-resistant disposable protective clothing fabric and a preparation process thereof. The method has the characteristics of good protection effect, high yield and good durability.
The technical scheme of the invention is as follows: the surface moisture-resistant disposable protective clothing fabric comprises a non-woven fabric layer, wherein the front surface of the non-woven fabric layer is coated with a hydrophobic coating, and the back surface of the non-woven fabric layer is connected with a modified PTFE microporous membrane; the thickness of the modified PTFE microporous membrane is 20-70 mu m, the porosity of the modified PTFE microporous membrane is 25-96%, and the pore diameter of the modified PTFE microporous membrane is 0.18-1.3 mu m.
In the surface moisture-resistant disposable protective clothing fabric, the hydrophobic coating is formed by coating nanoscale hydrophobic groups.
In the surface moisture-resistant disposable protective clothing fabric, the modified PTFE microporous membrane is connected with the non-woven fabric layer through a hot melt adhesive, the hot melt adhesive is a polyester hot melt adhesive or a low-temperature-resistant organic silicon adhesive, and the gluing amount of the hot melt adhesive is 30.5-34.5 g/square meter.
The preparation process of the surface moisture-resistant disposable protective clothing fabric comprises the following steps:
hydrophilic wetting is carried out on a PTFE microporous membrane through a hydrophilic agent to obtain an a1 membrane, and then the a1 membrane is heated and modified at 350-400 ℃ to obtain a membrane A;
stretching to adjust the thickness of the membrane A and the porosity and the pore diameter of micropores in the membrane A to obtain a membrane B;
thirdly, spraying nanoscale hydrophobic groups on the front surface of the non-woven fabric to obtain C1 cloth, and then baking the C1 cloth at 160-180 ℃ to obtain C cloth;
fourthly, coating the surface of the B film with hot melt adhesive, adhering the B film to the back of the C cloth, and laminating the film-coated cloth to obtain D cloth;
curing the D cloth through a baking chamber to obtain E cloth;
sixthly, rolling the cloth E to obtain finished cloth.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the B film is conveyed to be adhered to the C cloth through the conveying assembly in the step IV, the conveying assembly comprises the high-speed roller set and the low-speed roller which are sequentially arranged, the high-speed roller set comprises the upper roller and the lower roller, the upper roller and the lower roller are mutually connected through the first transmission part, the outer part of the upper roller is connected with the lifting assembly, and one side of the upper roller is connected with the driving motor through the second transmission part.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the first transmission part is a first belt transmission set, the second transmission part comprises a second belt transmission set, and a gear transmission set is connected to the outside of the second belt transmission set; the one end coaxial coupling of first belt drive group and second belt drive group, gear drive group and first belt drive group are keeping away from second belt drive group one end coaxial coupling.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the number of the high-speed roller sets is two, and the two high-speed roller sets are respectively positioned on the left side and the right side of the C cloth.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, one side of the lower roller is connected with the turning plate.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the lower end of the driving motor is connected with the adjusting plate, the middle of the adjusting plate is rotatably connected, and one end of the adjusting plate is connected with the screw rod.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the lifting assembly comprises an air cylinder, the fixed end of the air cylinder is connected with an air cylinder frame, a rod head of the air cylinder penetrates through the air cylinder frame to be connected with a rotating frame, the middle part of the rotating frame is rotatably connected with an upper roller wheel, and two sides of the rotating frame are slidably connected with the air cylinder frame.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the fabric is laminated through the pressing assembly in the fourth step, the pressing assembly comprises a pressing wheel and a roller wheel which are vertically distributed, the left end and the right end of the pressing wheel are respectively connected with the lifting rod, the upper end of the lifting rod is connected with the driving part, the outside of the driving part is connected with the control part, the roller wheel comprises a wheel shaft, a pressing cylinder is arranged outside the wheel shaft, and a gap is reserved between the two ends of the pressing cylinder and the wheel shaft.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the wheel shaft comprises a cylindrical roller positioned in the middle, the outer surface of the cylindrical roller is connected with the inner wall of the pressing cylinder, symmetrical tapered rollers are arranged on two sides of the cylindrical roller, and the distance between the tapered rollers and the wheel shaft is gradually increased along the directions of two ends of the wheel shaft.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the end part of the pressing wheel is connected with the lifting rod through the frame body, the upper end of the frame body is provided with the movable groove, and the lower end of the lifting rod penetrates through the frame body and extends into the movable groove.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the control part is a rotating motor or a rotating handle.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the pressing cylinder is made of nylon or rubber.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the outside of the roller is connected with the conveying motor.
In the preparation process of the surface moisture-resistant disposable protective clothing fabric, the driving parts are worm and gear lifters or screw lifters, the driving parts at two ends of the pressing wheel are connected with each other through the control rod, and the outer side of the driving part at one side is connected with the control part.
Compared with the prior art, the invention has the following characteristics:
(1) according to the invention, the nanoscale hydrophobic groups are introduced into the front surface of the non-woven fabric, so that the hydrophobic resistance of the non-woven fabric can be effectively improved, and a good water repellent effect is achieved; through carrying out hydrophilic modification and heating modification on the PTFE membrane in sequence, the micropore size of the PTFE microporous membrane can be effectively controlled, meanwhile, the hydrophobicity and the adhesiveness of the PTFE microporous membrane are enhanced, the problem that the hydrophobicity and the adhesiveness of the existing PTFE microporous membrane cannot be considered at the same time is solved, and the adhesive property of the PTFE membrane and the protective effect of the fabric are effectively improved;
(2) on the basis, the invention further optimizes the size parameter of the modified PTFE microporous membrane according to the required protective effect, thereby greatly improving the protective effect of the fabric, and ensuring that the water impermeability of the protective clothing fabric prepared by the invention can be more than 30kPa, the synthetic blood penetration resistance can be more than 15kPa, and the moisture permeability can be more than 8000g/m224h, breaking strength is more than 50N, and breaking elongation is more than 30%; the blocking efficiency of the invention to blood and virus under natural condition and pressure condition can be more than 99%, and the invention has excellent protection effect;
(3) the invention further optimizes the type and the gluing amount of the hot melt adhesive required by the PTFE film during adhesion according to the physical and chemical properties of the modified PTFE microporous film, thereby effectively improving the peel strength of the modified PTFE microporous film while ensuring the air permeability of the fabric, enabling the peel strength to reach more than 6.6N/M and improving the yield and the durability of the fabric;
(4) according to the invention, by optimizing the conveying structure of the modified PTFE microporous membrane after being coated with glue, the high-speed roller set and the low-speed roller can enable the rear side membrane layer to gradually move forward along the conveying direction in the conveying process through the rotation speed difference, so that the membrane layer can return to a natural state after passing through the high-speed roller set, and the stretching problem of the modified PTFE microporous membrane coated with the glue layer in the conveying process is effectively avoided; after the problem of elongation of the modified PTFE microporous membrane is solved, the pore diameter parameter of the modified PTFE microporous membrane after adhesion and before pretreatment can be stably maintained, the deviation of the actual size of the modified PTFE microporous membrane caused by the processing problem is effectively avoided, and the protection effect of the invention is further improved;
(5) through the structural cooperation of the high-speed roller set, the upper roller and the lower roller can respectively pull the film layers on the upper side and the lower side, the pull-back effect of the modified PTFE microporous film is improved, and the upper roller and the lower roller can keep the same rotating speed through the cooperation of the first transmission part, so that the film layer abrasion caused by the rotating speed difference is avoided, and the reduction of the protection effect caused by the processing damage of the modified PTFE microporous film is avoided;
(6) in the laminating process of the modified PTFE microporous membrane and the cloth, the pressing wheel is lifted through the structural matching of the lifting rod, the driving part and the control part, compared with the existing air cylinder driving lifting mode, the gravity of the pressing wheel can be used as the pressing force of the laminating cloth, so that the pressure difference problem of the pressing wheel in the pressing process is effectively avoided, the modified PTFE microporous membrane can be uniformly adhered to the non-woven fabric along the length direction, the separation of the modified PTFE microporous membrane at the local position is avoided, and the protection effect and the durability of the invention are further improved;
(7) the gaps are formed between the two ends of the pressing cylinder and the wheel shaft, so that the influence of the wheel shaft on the appearance of the pressing cylinder due to the diameter difference and natural bending can be effectively reduced, the joint surface of the pressing cylinder and the cloth can keep good straightness, the pressing uniformity of the coated cloth is effectively improved, and the problem of uneven adhesion of the modified PTFE microporous membrane on the transverse position is avoided; through further optimization of the roller structure, the cylindrical roller and the conical roller are matched, so that on one hand, the straightness of the wheel shaft can be ensured, the height difference of the roller in the rotating process can be reduced, on the other hand, the obstruction of the wheel shaft on the straightness of the pressing barrel can be effectively reduced, the pressing barrel can keep a natural straight line state, and the pressing uniformity of the film-coated cloth is improved;
therefore, the invention has the characteristics of good protection effect, high yield and good durability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a transport assembly;
FIG. 3 is a right side view of the high speed roller set;
FIG. 4 is a schematic view of a press-fit assembly;
fig. 5 is a schematic view showing the connection of the frame body and the elevating bar.
The labels in the figures are: 1-nonwoven fabric layer, 2-hydrophobic coating, 3-modified PTFE microporous membrane, 4-low speed roller, 5-upper roller, 6-lower roller, 7-first transmission part, 8-second transmission part, 9-driving motor, 10-turning plate, 11-adjusting plate, 12-screw, 13-air cylinder, 14-air cylinder frame, 15-rotating frame, 16-pressing wheel, 17-roller, 18-lifting rod, 19-driving part, 20-frame body, 21-control part, 22-control rod, 171-wheel shaft, 172-pressing cylinder, 173-cylindrical roller, 174-conical roller and 201-movable groove.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Examples are given. The surface moisture-resistant disposable protective clothing fabric is shown in figure 1 and comprises a non-woven fabric layer 1, wherein the front surface of the non-woven fabric layer 1 is coated with a hydrophobic coating layer 2, and the back surface of the non-woven fabric layer 1 is connected with a modified PTFE microporous membrane 3; the thickness of the modified PTFE microporous membrane 3 is 20-70 mu m, the porosity of the modified PTFE microporous membrane 3 is 25-96%, and the pore diameter of the modified PTFE microporous membrane 3 is 0.18-1.3 mu m.
The hydrophobic coating 2 is formed by coating nanoscale hydrophobic groups.
The modified PTFE microporous membrane 3 is connected with a non-woven fabric layer through a hot melt adhesive, the hot melt adhesive is a polyester hot melt adhesive or a low temperature resistant organic silicon adhesive, and the gluing amount of the hot melt adhesive is 30.5-34.5 g/square meter.
The preparation process of the surface moisture-resistant disposable protective clothing fabric comprises the following steps:
hydrophilic wetting is carried out on a PTFE microporous membrane through a hydrophilic agent to obtain an a1 membrane, and then the a1 membrane is heated and modified at 350-400 ℃ to obtain a membrane A;
stretching to adjust the thickness of the membrane A and the porosity and the pore diameter of micropores in the membrane A to obtain a membrane B;
thirdly, spraying nanoscale hydrophobic groups on the front surface of the non-woven fabric to obtain C1 cloth, and then baking the C1 cloth at 160-180 ℃ to obtain C cloth;
fourthly, coating the surface of the B film with hot melt adhesive, adhering the B film to the back of the C cloth, and laminating the film-coated cloth to obtain D cloth;
curing the D cloth through a baking chamber to obtain E cloth;
sixthly, rolling the cloth E to obtain finished cloth.
And in the fourth step, the film B is conveyed to be bonded with the cloth C through the conveying assembly, the conveying assembly is formed as shown in figures 2-3 and comprises a high-speed roller set and a low-speed roller 4 which are sequentially arranged, the high-speed roller set comprises an upper roller 5 and a lower roller 6, the upper roller 5 and the lower roller 6 are connected with each other through a first transmission part 7, the outer part of the upper roller 5 is connected with a lifting assembly, and one side of the upper roller 5 is connected with a driving motor 9 through a second transmission part 8.
The first transmission part 7 is a first belt transmission set, the second transmission part 8 comprises a second belt transmission set, and a gear transmission set is connected to the outside of the second belt transmission set; one end of the first belt transmission group is coaxially connected with one end of the second belt transmission group, and the gear transmission group is coaxially connected with one end of the first belt transmission group far away from the second belt transmission group; the first belt transmission group and the second belt transmission group are formed by connecting two belt pulleys and a transmission belt; the gear transmission group consists of two gears which are mutually kneaded.
The number of the high-speed roller sets is two, and the two high-speed roller sets are respectively positioned on the left side and the right side of the modified PTFE microporous membrane.
One side of the lower roller 6 is connected with a turning plate 10.
The lower extreme of driving motor 9 is connected with regulating plate 11, and the outside frame is connected in the rotation of regulating plate 11 lower extreme, and the one end of regulating plate 11 is connected with screw rod 12.
The lifting assembly comprises an air cylinder 13, an air cylinder frame 14 is connected to the fixed end of the air cylinder 13, a rod head of the air cylinder 13 penetrates through the air cylinder frame 14 to be connected with a rotating frame 15, the middle of the rotating frame 15 is rotatably connected with an upper roller wheel 5, and two sides of the rotating frame 15 are slidably connected with the air cylinder frame 14.
In the fourth step, the cloth is laminated through the pressing assembly, the pressing assembly is composed of a pressing wheel 16 and a roller 17 which are distributed up and down as shown in fig. 4-5, the left end and the right end of the pressing wheel 16 are respectively connected with a lifting rod 18, the upper end of the lifting rod 18 is connected with a driving part 19, the outside of the driving part 19 is connected with a control part 21, the roller 17 comprises a wheel shaft 171, a pressing cylinder 172 is arranged outside the wheel shaft 171, and a gap is reserved between the two ends of the pressing cylinder 172 and the wheel shaft 171.
The wheel axle 171 comprises a cylindrical roller 173 at the middle, the outer surface of the cylindrical roller 173 is connected with the inner wall of the pressing cylinder 172, symmetrical tapered rollers 174 are arranged at both sides of the cylindrical roller 173, and the distance between the tapered rollers 174 and the wheel axle 171 gradually increases along the direction of both ends of the wheel axle 171.
The end part of the pressing wheel 16 is connected with a lifting rod 18 through a frame body 20, the middle part of the frame body 20 is rotatably connected with the pressing wheel 16, the upper end of the frame body 20 is provided with a movable groove 201, and the lower end of the lifting rod 18 penetrates through the frame body 20 and extends into the movable groove 201.
The control part 21 is a rotating motor or a rotating handle.
The pressing cylinder 172 is made of nylon or rubber.
And a conveying motor is connected to the outside of the roller 17.
The driving parts 19 are worm wheel and worm rod lifters or screw rod lifters, the driving parts 19 at two ends of the pinch roller 16 are connected with each other through a control rod 22, and the outer side of one driving part 19 is connected with a control part 21.
The working principle of the invention is as follows: when the modified PTFE microporous membrane is prepared, the hydrophilic modification and the heating modification are firstly carried out on the PTFE microporous membrane, so that the micropore size of the modified PTFE microporous membrane is effectively controlled, and the hydrophobicity and the adhesiveness of the microporous membrane are improved; the nanoscale hydrophobic groups are sprayed on the front surface of the non-woven fabric, so that the single-surface hydrophobic resistance of the non-woven fabric can be improved, and the water (liquid) repellent effect is achieved; the polyester hot-melt adhesive or the low-temperature-resistant organic silicon adhesive is used for bonding the modified PTFE microporous membrane and the non-woven fabric, so that the low-temperature flexibility of the coated fabric can be effectively improved, the surface bonding property of the modified PTFE microporous membrane is improved, and the modified PTFE microporous membrane is effectively prevented from falling off in subsequent use. The modified PTFE microporous membrane coated with the hot melt adhesive can be gradually stretched under the conventional uniform-speed conveying, so that the aperture of the micropores is changed; the invention can keep the natural state of the B film when being bonded with the C cloth through the matching of the high-speed roller group and the low-speed roller, thereby avoiding the elongation of the B film caused by the action of the conveying roller.
When the high-speed roller set is used, the cylinder 13 extends out to enable the upper roller 5 to be located at a joint position with the upper surface of the B film, meanwhile, the lower roller 6 rotates to be in a vertical state through the turning plate 10 and is mutually jointed with the lower surface of the B film, and the upper roller 5 is in transmission connection with the lower roller 6 through the first transmission part 7. The driving motor 9 drives the upper roller 5 to rotate through the second transmission part 8 during operation, and drives the lower roller 6 to rotate reversely through the first transmission part 7 which is coaxially and rotatably connected with the second transmission part 8, so that the upper roller 5 and the lower roller 6 can play a role in compressing and conveying the B film, and the travelling speed of the B film is changed; because the speed difference can be generated when the B film is positioned at the high-speed roller group and the low-speed roller 4, the B film can be close to the front side in the conveying process, and the elongation of the B film in the conveying process is relieved. When the driving motor 9 is used, the inclination angle of the adjusting plate 11 can be adjusted through the screw 12, so that the tensioning effect is achieved on the second transmission part 8, and the second transmission part has good transmission stability. Through the cooperation of the turning plate 10 and the air cylinder 13, a user can detach the first transmission part 7 and then respectively separate the upper roller 5 and the lower roller 6 from the B film, so that the high-speed roller set is stopped and the normal work of the production line is not influenced.
After the membrane B and the cloth C are bonded, the laminated cloth can effectively improve the bonding effect generated by the hot melt adhesive and enhance the peeling strength of the modified PTFE microporous membrane. Through the pressing effect of the pressing assembly, on one hand, uneven stress of the film-coated cloth in the length direction due to pressure difference can be avoided, and the pressing uniformity is improved; on the other hand, the stress unevenness of the transverse position of the film covering cloth caused by the processing limitation of the traditional solid pressing roller due to the high and low edges can be avoided, so that the pressing uniformity is further improved.
When the pressing assembly is in use, the control portion 21 drives the lifting rods 18 on both sides to synchronously lift through the control rods 22, so as to drive the pressing wheel 16 to move downwards. The cloth passes through between the pressing wheel 16 and the roller 17 after being coated with the film, and the coated cloth is pressed by the pressing wheel 16 after being pressed down by the gravity of the cloth; the end of the lifting rod 18 is located in the middle of the movable groove 201 and is movably connected with the movable groove 201 during pressing. Because the gravity of the pressing wheel 16 can reach more than 200kg, the pressing wheel 16 can provide stable pressure for the cloth in the working process, the pressing effect on the cloth is effectively improved, and the problem of pressure difference is avoided. When the cloth is pressed, the positions on the two sides of the pressing cylinder 172 are not limited by the shape of the wheel shaft 171 through the matching of the pressing cylinder 172 and the tapered rollers 174 on the two sides, so that the deformation of the pressing cylinder 172 caused by the limitation of the shape of the wheel shaft 171 with a middle-high side and a low side is avoided, the pressing cylinder 172 can keep good straightness, and the pressing uniformity of the cloth is effectively improved.
Finally, the laminated D cloth is cured, so that the modified PTFE microporous membrane and the cloth are firmly bonded under the action of the hot melt adhesive, the protection effect and the durability of the fabric are effectively improved, and the water impermeability of the fabric of the protective clothing treated by the method can be more than 30kPa, the synthetic blood penetration resistance is more than 15kPa, and the moisture permeability is more than 8000g/m224h, breaking strength greater than 50N, and elongation at break greater than 30%.
Experimental example 1: heating and modifying the PTFE microporous membrane according to the process of the first step, respectively adjusting the heating temperature of the PTFE microporous membrane, and then detecting the roughness, the crystallinity and the adhesion performance of the modified PTFE microporous membrane; the results are shown in table 1:
TABLE 1 parameter index of PTFE microporous membrane at different modification temperatures
| Temperature/. degree.C | Roughness/nm | Degree of crystallinity | Roll angle | Adhesion/. mu.N |
| 260 | 110.0 | 56.3％ | 120° | 176.5 |
| 300 | 94.6 | 44.1％ | 124° | 188.4 |
| 350 | 80.2 | 39.0％ | 131° | 189.4 |
| 400 | 74.3 | 36.4％ | 134° | 214.5 |
| 440 | 83.2 | 37.1％ | 127° | 228.7 |
According to the detection result, when the heating temperature is 350-400 ℃, the roughness, the crystallinity and the adhesiveness of the modified PTFE microporous membrane are optimal.
Experimental example 2: adhering the B film and the C cloth according to the process of the step IV of the invention, respectively adjusting the gluing amount of the hot melt adhesive in the adhering process, and then detecting the peeling strength of the cloth after adhesion; the results are shown in table 2:
TABLE 2 Peel Strength of coated fabrics at different sizing amounts
| Sizing amount g/m2 | Peeling Strength/N | Peeled |
| 3 | 0.48 | Complete stripping |
| 7 | 1.87 | Complete stripping |
| 12 | 1.92 | Failure to completely peel off and |
| 16 | 2.04 | Can not be completelyPeeling, film breaking |
| 20 | 2.14 | Failure to completely peel off and film breakage |
| 25 | - | Difficulty in peeling |
According to the detection result, when the gluing amount of the hot melt adhesive is more than 25 g/square meter, the peel strength and peel difficulty of the modified PTFE microporous membrane are excellent.
Experimental example 3: the protective clothing fabric prepared by the invention and the protective clothing fabric produced by Gore company in the united states are used as comparison groups, the unit area weight, moisture permeability, hydrostatic pressure resistance and peel strength indexes of the two groups are respectively measured, the detection results are compared with the standard indexes, and the detection results are shown in table 3:
TABLE 3 comparison of the test data of the invention with the test data of the same type of fabric
According to the detection result, the main protection technical index of the invention reaches the technical level of the similar products of Gore company in America, slightly exceeds the moisture permeability and the peel strength and is in the international leading level.
Claims (10)
1. Surface moisture resistance type disposable protective clothing surface fabric which characterized in that: the modified PTFE microporous membrane comprises a non-woven fabric layer (1), wherein a hydrophobic coating (2) is coated on the front surface of the non-woven fabric layer (1), and a modified PTFE microporous membrane (3) is connected to the back surface of the non-woven fabric layer (1); the thickness of the modified PTFE microporous membrane (3) is 20-70 mu m, the porosity of the modified PTFE microporous membrane (3) is 25-96%, and the pore diameter of the modified PTFE microporous membrane (3) is 0.18-1.3 mu m.
2. The surface moisture-resistant disposable protective garment fabric according to claim 1, characterized in that: the hydrophobic coating (2) is formed by coating nanoscale hydrophobic groups.
3. The surface moisture-resistant disposable protective garment fabric according to claim 1, characterized in that: the modified PTFE microporous membrane (3) is connected with the non-woven fabric layer through a hot melt adhesive, the hot melt adhesive is a polyester hot melt adhesive or a low-temperature-resistant organic silicon adhesive, and the gluing amount of the hot melt adhesive is 30.5-34.5 g/square meter.
4. The preparation process of the surface moisture-resistant disposable protective clothing fabric based on the claim 1, 2 or 3 is characterized by comprising the following steps:
hydrophilic wetting is carried out on a PTFE microporous membrane through a hydrophilic agent to obtain an a1 membrane, and then the a1 membrane is heated and modified at 350-400 ℃ to obtain a membrane A;
stretching to adjust the thickness of the membrane A and the porosity and the pore diameter of micropores in the membrane A to obtain a membrane B;
thirdly, spraying nanoscale hydrophobic groups on the front surface of the non-woven fabric to obtain C1 cloth, and then baking the C1 cloth at 160-180 ℃ to obtain C cloth;
fourthly, coating the surface of the B film with hot melt adhesive, adhering the B film to the back of the C cloth, and laminating the film-coated cloth to obtain D cloth;
curing the D cloth through a baking chamber to obtain E cloth;
sixthly, rolling the cloth E to obtain finished cloth.
5. The preparation process of the surface moisture-resistant disposable protective clothing fabric according to claim 4, which is characterized in that: the B film is transported to be bonded with the C cloth through the conveying assembly in the step IV, the conveying assembly comprises a high-speed roller set and a low-speed roller (4) which are sequentially arranged, the high-speed roller set comprises an upper roller (5) and a lower roller (6), the upper roller (5) and the lower roller (6) are connected with each other through a first transmission part (7), the outer part of the upper roller (5) is connected with a lifting assembly, and one side of the upper roller (5) is connected with a driving motor (9) through a second transmission part (8).
6. The preparation process of the surface moisture-resistant disposable protective clothing fabric according to claim 5, which is characterized in that: the first transmission part (7) is a first belt transmission set, the second transmission part (8) comprises a second belt transmission set, and a gear transmission set is connected to the outside of the second belt transmission set; the one end coaxial coupling of first belt drive group and second belt drive group, gear drive group and first belt drive group are keeping away from second belt drive group one end coaxial coupling.
7. The preparation process of the surface moisture-resistant disposable protective clothing fabric according to claim 5, which is characterized in that: the lifting assembly comprises an air cylinder (13), an air cylinder frame (14) is connected to the fixed end of the air cylinder (13), a rod head of the air cylinder (13) penetrates through the air cylinder frame (14) to be connected with a rotating frame (15), an upper roller (5) is rotatably connected to the middle of the rotating frame (15), and the two sides of the rotating frame (15) are slidably connected with the air cylinder frame (14).
8. The preparation process of the surface moisture-resistant disposable protective clothing fabric according to claim 4, which is characterized in that: and laminating the cloth through a pressing assembly in the step (IV), wherein the pressing assembly comprises a pressing wheel (16) and a roller (17) which are vertically distributed, the left end and the right end of the pressing wheel (16) are respectively connected with a lifting rod (18), the upper end of the lifting rod (18) is connected with a driving part (19), the outside of the driving part (19) is connected with a control part (21), the roller (17) comprises a wheel shaft (171), a pressing cylinder (172) is arranged outside the wheel shaft (171), and a gap is reserved between the two ends of the pressing cylinder (172) and the wheel shaft (171).
9. The preparation process of the surface moisture-resistant disposable protective clothing fabric according to claim 8, characterized in that: the wheel shaft (171) comprises a cylindrical roller (173) located in the middle, the outer surface of the cylindrical roller (173) is connected with the inner wall of the pressing cylinder (172), symmetrical tapered rollers (174) are arranged on two sides of the cylindrical roller (173), and the distance between the tapered rollers (174) and the wheel shaft (171) is gradually increased along the directions of two ends of the wheel shaft (171).
10. The preparation process of the surface moisture-resistant disposable protective clothing fabric according to claim 8, characterized in that: the end part of the pinch roller (16) is connected with a lifting rod (18) through a frame body (20), a movable groove (201) is formed in the upper end of the frame body (20), and the lower end of the lifting rod (18) penetrates through the frame body (20) and extends into the movable groove (201).
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