Waterproof breathable fabric and preparation method thereof

Abstract

The invention relates to the technical field of fabrics, and discloses a waterproof breathable fabric and a preparation method thereof. The prepared waterproof breathable fabric is composed of the breathable cotton cloth, the TPU hot melt adhesive film and the outer-layer fabric, the cotton cloth serves as the inner layer of the fabric, sweat generated by the human body can be effectively absorbed, and the fabric has certain breathability; the outer-layer fabric is formed by spinning the yarns which are subjected to padding treatment by adopting the waterproof and breathable coating, and has excellent breathability and waterproofness; in addition, the breathable cotton cloth and the outer-layer fabric are compounded through the TPU hot melt adhesive film, the adhesive film has certain breathability after being heated and bonded, and the breathability and waterproofness of the fabric are not affected. Therefore, the waterproof breathable fabric prepared by the invention can be widely applied to textiles such as bedding articles, clothes and the like, and has a good application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of fabrics, and in particular to a waterproof and breathable fabric and a preparation method thereof. Background Art

[0002] Fabrics are the materials used to make clothing. As one of the three key elements of clothing, they not only define the functional characteristics of a garment's style but also directly influence its color, shape, and other performance aspects. As clothing styles and functions evolve, the functional properties required of fabrics continue to expand and improve to meet specific uses and applications. For example, some applications require fabrics to be both waterproof and breathable, but existing fabrics typically only offer a single property. Therefore, fabrics need to be processed to combine breathability, waterproofness, and other properties (such as antistatic and flame retardancy).

[0003] Traditional fabrics are usually waterproofed by applying a layer of waterproof coating to the outer surface of a multi-layer fabric. However, the fabric treated in this way has poor air permeability. To address this shortcoming, the yarn can be first impregnated with a waterproof coating, and then the treated yarn is woven into fabric. The fabric treated in this way still has excellent air permeability. In addition, the coating used can be treated by introducing hydrophobic and antistatic raw materials into the coating to improve the coating's hydrophobicity and antistatic properties, thereby giving the fabric certain waterproof and antistatic properties. In response to the above situation, the present application discloses a waterproof and breathable fabric and a preparation method thereof to solve this technical problem. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a waterproof and breathable fabric and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A waterproof and breathable fabric, comprising an inner layer, an adhesive layer and an outer layer, wherein the inner layer is a breathable cotton cloth, the adhesive layer is a TPU hot melt adhesive film, and the outer layer is woven from yarns that have been impregnated with a waterproof and breathable coating;

[0007] The outer fabric is prepared by the following steps:

[0008] Step A1, dimethylaminobutanol, triethylamine and toluene were added to a flask and stirred to mix evenly. Then, the methacryloyl chloride toluene solution was transferred to a constant pressure dropping funnel and slowly added dropwise to the flask under ice-water bath and stirring conditions for 4-5 hours. After the addition was completed, the reaction was carried out at room temperature for 12 hours, and then filtered, washed, and dried to obtain Intermediate 1;

[0009] Step A2: Add intermediate 1 to a reactor, stir at 45°C, add 1-chlorododecane dropwise using a constant pressure separatory funnel at a rate of 5s / drop, and react for 12h. The mixture is allowed to stand in the separatory funnel for 12h, the lower layer of liquid is separated, and the liquid is rotated and freeze-dried for 8h to obtain a functional monomer;

[0010] Step A3, weighing raw materials by weight, adding 80-90 parts of deionized water, 0.01-0.05 parts of OP-10 (emulsifier), 0.05-0.2 parts of sodium lauryl sulfate, and 0.01-0.08 parts of potassium persulfate to a reactor and stirring evenly, then adding 3-8 parts of acrylic acid, 2-5 parts of 2-(perfluorobutyl) ethyl acrylate, 10-15 parts of methyl methacrylate, 8-15 parts of functional monomer, and 25-35 parts of butyl acrylate, stirring and mixing evenly, and then adding to the reactor, reacting at 45-85° C. for 3-5 hours, and cooling to room temperature to obtain a polyacrylate emulsion;

[0011] Step A4: Weigh the raw materials by weight, and stir and mix 35-55 parts of polyacrylate emulsion, 10-18 parts of modified silica, 0.5-1.5 parts of BYK-191 (dispersant), 3-5 parts of ethylene glycol, 3-5 parts of polyoxypropylene glycerol ether (defoaming agent), and 20-30 parts of deionized water to obtain a waterproof and breathable coating.

[0012] Step A5: using the yarn as warp and weft, immersing the yarn in a waterproof and breathable coating, performing a padding treatment using a triple-dip and triple-pad process, and then drying the yarn, and then weaving the outer fabric;

[0013] Furthermore, in step A1, the amount ratio of dimethylaminobutanol, triethylamine, toluene and methacryloyl chloride toluene solution is 0.01-0.03 mol: 6.1-18.2 g: 100 mL: 60 mL, and the methacryloyl chloride toluene solution is prepared by stirring and mixing methacryloyl chloride and toluene in an amount ratio of 0.012-0.032 mol: 60 mL;

[0014] Furthermore, in step A2, the molar ratio of intermediate 1 to 1-chlorododecane is 1:1;

[0015] Furthermore, the yarns in step A5 are all made by mixing viscose fiber, polyester fiber and cotton fiber in a mass ratio of 1:4-6:3-4, with a warp density of 68-78 yarns / cm and a weft density of 45-55 yarns / cm.

[0016] The modified silicon dioxide is prepared by the following steps:

[0017] Step B1, sodium lauryl sarcosinate is added to a flask containing deionized water and stirred for 10 minutes, then 0.1 mol / L hydrochloric acid is added and stirred for 30 minutes, and then ethyl orthosilicate is added and stirred for 30-60 minutes. The mixture is allowed to stand at room temperature for 4-6 hours, and then the system temperature is increased to 70-80°C and allowed to stand for 24 hours. The mixture is centrifuged, washed, dried, and the product is collected. The product is then redispersed in a mixture of ethanolamine and ethanol, and extracted under reflux in an oil bath at 90°C for 12 hours. The extraction is then repeated once, and the mixture is centrifuged, washed, and dried to obtain mesoporous silica.

[0018] Step B2: lauryl acrylate, 3-(isomethacryloyloxy)propyltrimethoxysilane, and ethanol were added to a beaker and stirred to mix evenly, which was recorded as mixed solution 1; mesoporous silica was then ultrasonically dispersed in ethanol, added to mixed solution 1, and stirred to mix evenly, and then azobisisobutyronitrile ethanol solution was added, and the system temperature was increased to 65-75° C. and reacted for 3.5-4.5 hours. The mixture was centrifuged, washed, and dried to obtain modified silica;

[0019] Furthermore, in step B1, the usage ratio of sodium lauryl sarcosinate, deionized water, hydrochloric acid, ethyl orthosilicate, ethanolamine, and ethanol is 0.6-1.2 g:120 mL:4-8 g:3.2-6.4 mL:40 mL:160 mL;

[0020] Furthermore, in step B2, the ratio of mesoporous silica, ethanol, mixed solution 1, and azobisisobutyronitrile ethanol solution is 1-2 g: 20 mL: 25 mL: 10 mL;

[0021] Furthermore, the ratio of lauryl acrylate, 3-(methacryloyloxy)propyltrimethoxysilane and ethanol in the mixed solution 1 used in step B2 is 0.065-0.13 mol: 0.004-0.008 mol: 25 mL;

[0022] Furthermore, the azobisisobutyronitrile ethanol solution in step B2 is prepared by stirring and mixing azobisisobutyronitrile and ethanol in a dosage ratio of 0.06-0.12 g:10 mL.

[0023] A method for preparing a waterproof and breathable fabric comprises the following steps:

[0024] The breathable cotton cloth, TPU hot melt adhesive film and outer fabric are stacked in sequence and hot pressed and laminated using hot ironing equipment to obtain a waterproof and breathable fabric.

[0025] Beneficial effects of the present invention:

[0026] The waterproof and breathable fabric prepared by the present invention is composed of three parts: breathable cotton cloth, a TPU hot-melt adhesive film, and an outer fabric. The cotton cloth serves as the inner layer, effectively absorbing human sweat and providing a certain degree of breathability. The outer fabric is woven from yarn that has been impregnated with a waterproof and breathable coating, exhibiting excellent breathability and waterproof properties. Furthermore, the breathable cotton cloth and the outer fabric are laminated with a TPU hot-melt adhesive film, which maintains a certain degree of breathability after heating and bonding, without affecting the breathability and waterproof properties of the fabric. Therefore, the waterproof and breathable fabric prepared by the present invention can be widely used in textiles such as bedding and clothing, and has great application prospects.

[0027] The outer fabric is woven from yarns that have been impregnated with a waterproof and breathable coating. The polyacrylate emulsion in the waterproof and breathable coating is first prepared by reacting the acyl chloride group in methacryloyl chloride with the hydroxyl group in dimethylaminobutanol to generate intermediate 1; then, a nucleophilic substitution reaction occurs between the tertiary amine group in intermediate 1 and the chlorine atom of 1-chlorododecane to generate a functional monomer containing an ammonium cation; and then, the polyacrylate emulsion is prepared using acrylic acid, 2-(perfluorobutyl)ethyl acrylate, methyl methacrylate, functional monomers, and butyl acrylate as basic raw materials. The yarn used for the outer fabric is made of a blend of viscose fiber, polyester fiber and cotton fiber. The yarn not only maintains the excellent air permeability of cotton fiber, but also has the high strength and elasticity of polyester fiber. At the same time, the waterproof and breathable coating is treated by yarn impregnation, which can increase the air permeability gap of the fabric and improve the breathability of the fabric. Among them, the hydrophobic monomers (methyl methacrylate, 2-(perfluorobutyl) ethyl acrylate and butyl acrylate) introduced into the polyacrylate emulsion give the fabric certain waterproof properties. At the same time, the introduction of functional monomers also gives the fabric certain antistatic properties. This is because the ammonium cations contained in the functional monomers are positively charged and can effectively neutralize the negative charge on the surface of the fabric, thereby achieving the effect of eliminating static electricity.

[0028] In the modified silica, mesoporous silica is synthesized using ethyl orthosilicate as a silicon source and sodium lauryl sarcosinate as a template. Lauryl acrylate and 3-(isobutyleneoxy)propyltrimethoxysilane are used as raw materials, and azobisisobutyronitrile is used as an initiator to coat the surface of the mesoporous silica with a hydrophobic polymer to obtain the modified silica. Modified silica is obtained by using mesoporous silica as a base and coating a hydrophobic polymer on its surface. The polymer is added to the coating and the outer fabric yarn is treated by immersion padding, which further improves the hydrophobicity of the outer fabric and makes the outer fabric have certain waterproof properties. This is because the polymer coated on the surface of the modified silica contains long-chain hydrophobic alkyl groups with low surface energy. The long-chain hydrophobic alkyl groups will migrate to the surface of the yarn during the immersion padding process, thereby reducing the surface energy of the yarn surface and making it hydrophobic to a certain extent, so that the fabric prepared using the yarn has waterproof properties; the mesoporous silica contains a large number of pore structures, which can provide a path for gas flow and make the fabric have a certain air permeability; in addition, the polymer coated on the surface of the modified silica also contains a siloxane structure. The silanol groups produced after the hydrolysis of the siloxane can react with the active groups on the surface of the yarn, so that the modified silica can be firmly fixed on the surface of the yarn, which can effectively prevent the coating from falling off due to washing. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] Example 1

[0031] Modified silica is prepared by the following steps:

[0032] Step B1, 0.6 g of sodium lauryl sarcosinate was added to a flask containing 120 mL of deionized water and stirred for 10 min, followed by the addition of 4 g of 0.1 mol / L hydrochloric acid and stirring for 30 min, followed by the addition of 3.2 mL of ethyl orthosilicate and continued stirring for 30 min, and allowed to stand at room temperature for 4 h, then the system temperature was raised to 70 ° C and allowed to stand for 24 h, centrifuged, washed, dried, and the product was collected, and then redispersed in a mixture of 40 mL of ethanolamine and 160 mL of ethanol, and extracted under reflux in an oil bath at 90 ° C for 12 h, and then the extraction was repeated once, and then centrifuged, washed, and dried to obtain mesoporous silica;

[0033] Step B2, 0.065 mol of lauryl acrylate, 0.004 mol of 3-(isobutyleneoxy)propyltrimethoxysilane and 25 mL of ethanol were added to a beaker and stirred and mixed evenly, recorded as mixed solution 1; then 1 g of mesoporous silica was ultrasonically dispersed in 20 mL of ethanol, 25 mL of mixed solution 1 was added and stirred and mixed evenly, and then 10 mL of azobisisobutyronitrile ethanol solution was added, and the system temperature was increased to 65°C and reacted for 3.5 hours, centrifuged, washed, and dried to obtain modified silica. The azobisisobutyronitrile ethanol solution was prepared by stirring azobisisobutyronitrile and ethanol in a dosage ratio of 0.06 g:10 mL.

[0034] The outer fabric is prepared by the following steps:

[0035] Step A1, 0.01 mol of dimethylaminobutanol, 6.1 g of triethylamine and 100 mL of toluene were added to a flask and stirred to mix evenly. Then, 60 mL of methacryloyl chloride toluene solution was transferred to a constant pressure dropping funnel and slowly added dropwise to the flask under ice-water bath and stirring conditions. The addition time was 4 hours. After the addition was completed, the mixture was reacted at room temperature for 12 hours, filtered, washed, and dried to obtain intermediate 1. The methacryloyl chloride toluene solution was prepared by stirring and mixing methacryloyl chloride and toluene in a ratio of 0.012 mol: 60 mL;

[0036] Step A2: Add intermediate 1 to a reactor, stir at 45°C, add 1-chlorododecane dropwise using a constant pressure separatory funnel at a rate of 5s / drop, and react for 12 hours. The mixture is allowed to stand in the separatory funnel for 12 hours, and the lower layer of liquid is separated, rotated, and freeze-dried for 8 hours to obtain a functional monomer. The molar ratio of intermediate 1 to 1-chlorododecane is 1:1.

[0037] Step A3: Weigh the raw materials by weight, add 80 parts of deionized water, 0.01 parts of OP-10 (emulsifier), 0.05 parts of sodium lauryl sulfate, and 0.01 parts of potassium persulfate to a reactor and stir evenly. Then, add 3 parts of acrylic acid, 2 parts of 2-(perfluorobutyl) ethyl acrylate, 10 parts of methyl methacrylate, 8 parts of functional monomer, and 25 parts of butyl acrylate, stir and mix evenly, and then add to the reactor. React at 45° C. for 3 hours, and cool to room temperature to obtain a polyacrylate emulsion.

[0038] Step A4: Weigh the raw materials by weight, and stir and mix 35 parts of polyacrylate emulsion, 10 parts of modified silica, 0.5 parts of BYK-191 (dispersant), 3 parts of ethylene glycol, 3 parts of polyoxypropylene glycerol ether (defoaming agent), and 20 parts of deionized water to obtain a waterproof and breathable coating;

[0039] Step A5: The yarns are used as warp and weft yarns, immersed in a waterproof and breathable coating, and subjected to a three-dip and three-roll treatment, followed by drying, and then woven into an outer fabric. The yarns are all spun from a mixture of viscose fiber, polyester fiber, and cotton fiber in a mass ratio of 1:4:3. The density of the warp yarn is 68 yarns / cm, and the density of the weft yarn is 45 yarns / cm.

[0040] Example 2

[0041] Modified silica is prepared by the following steps:

[0042] Step B1, 0.9 g of sodium lauryl sarcosinate was added to a flask containing 120 mL of deionized water and stirred for 10 min, followed by the addition of 6 g of 0.1 mol / L hydrochloric acid and stirring for 30 min, followed by the addition of 4.8 mL of ethyl orthosilicate and continued stirring for 45 min, and allowed to stand at room temperature for 5 h, then the system temperature was raised to 75 ° C and allowed to stand for 24 h, centrifuged, washed, dried, and the product was collected, and then redispersed in a mixture of 40 mL of ethanolamine and 160 mL of ethanol, and extracted under reflux in an oil bath at 90 ° C for 12 h, and then the extraction was repeated once, and then centrifuged, washed, and dried to obtain mesoporous silica;

[0043] Step B2, 0.09 mol of lauryl acrylate, 0.006 mol of 3-(isobutyleneoxy)propyltrimethoxysilane and 25 mL of ethanol were added to a beaker and stirred and mixed evenly, recorded as mixed solution 1; then 1.5 g of mesoporous silica was ultrasonically dispersed in 20 mL of ethanol, 25 mL of mixed solution 1 was added and stirred and mixed evenly, and then 10 mL of azobisisobutyronitrile ethanol solution was added, and the system temperature was raised to 70° C. and reacted for 4 hours, centrifuged, washed, and dried to obtain modified silica. The azobisisobutyronitrile ethanol solution was prepared by stirring azobisisobutyronitrile and ethanol in a dosage ratio of 0.09 g:10 mL.

[0044] The outer fabric is prepared by the following steps:

[0045] Step A1, 0.02 mol of dimethylaminobutanol, 12.2 g of triethylamine and 100 mL of toluene were added to a flask and stirred to mix evenly. Then, 60 mL of methacryloyl chloride toluene solution was transferred to a constant pressure dropping funnel and slowly added dropwise to the flask under ice-water bath and stirring conditions. The addition time was 4.5 h. After the addition was completed, the mixture was reacted at room temperature for 12 h, filtered, washed, and dried to obtain intermediate 1. The methacryloyl chloride toluene solution was prepared by stirring and mixing methacryloyl chloride and toluene in a ratio of 0.022 mol: 60 mL;

[0046] Step A2: Add intermediate 1 to a reactor, stir at 45°C, add 1-chlorododecane dropwise using a constant pressure separatory funnel at a rate of 5s / drop, and react for 12 hours. The mixture is allowed to stand in the separatory funnel for 12 hours, and the lower layer of liquid is separated, rotated, and freeze-dried for 8 hours to obtain a functional monomer. The molar ratio of intermediate 1 to 1-chlorododecane is 1:1.

[0047] Step A3: Weigh the raw materials by weight, add 85 parts of deionized water, 0.03 parts of OP-10 (emulsifier), 0.1 parts of sodium lauryl sulfate, and 0.04 parts of potassium persulfate to a reactor and stir evenly. Then, add 6 parts of acrylic acid, 3 parts of 2-(perfluorobutyl) ethyl acrylate, 12 parts of methyl methacrylate, 12 parts of functional monomer, and 30 parts of butyl acrylate, stir and mix evenly, and then add to the reactor. React at 65° C. for 4 hours, and cool to room temperature to obtain a polyacrylate emulsion.

[0048] Step A4: Weigh the raw materials by weight, and stir and mix 45 parts of polyacrylate emulsion, 14 parts of modified silica, 1 part of BYK-191 (dispersant), 4 parts of ethylene glycol, 4 parts of polyoxypropylene glycerol ether (defoaming agent), and 25 parts of deionized water to obtain a waterproof and breathable coating.

[0049] Step A5: The yarns are used as warp and weft yarns, immersed in a waterproof and breathable coating, and subjected to a three-dip and three-roll treatment, followed by a drying treatment, and then woven into an outer fabric. The yarns are all spun from a mixture of viscose fiber, polyester fiber, and cotton fiber in a mass ratio of 1:5:3. The density of the warp yarn is 78 yarns / cm, and the density of the weft yarn is 55 yarns / cm.

[0050] Example 3

[0051] Modified silica is prepared by the following steps:

[0052] Step B1, 1.2g of sodium lauryl sarcosinate was added to a flask containing 120mL of deionized water and stirred for 10min, followed by the addition of 8g of 0.1mol / L hydrochloric acid and stirring for 30min, followed by the addition of 6.4mL of ethyl orthosilicate and continued stirring for 60min, and allowed to stand at room temperature for 6h, then the system temperature was raised to 80°C and allowed to stand for 24h, centrifuged, washed, dried, and the product was collected, and then redispersed in a mixture of 40mL of ethanolamine and 160mL of ethanol, and extracted under reflux in an oil bath at 90°C for 12h, and then the extraction was repeated once, and then centrifuged, washed, and dried to obtain mesoporous silica;

[0053] Step B2, 0.13 mol of lauryl acrylate, 0.008 mol of 3-(isobutyleneoxy)propyltrimethoxysilane and 25 mL of ethanol were added to a beaker and stirred and mixed evenly, recorded as mixed solution 1; then 2 g of mesoporous silica was ultrasonically dispersed in 20 mL of ethanol, 25 mL of mixed solution 1 was added and stirred and mixed evenly, and then 10 mL of azobisisobutyronitrile ethanol solution was added, and the system temperature was raised to 75°C and reacted for 4.5 hours, centrifuged, washed, and dried to obtain modified silica. The azobisisobutyronitrile ethanol solution was prepared by stirring azobisisobutyronitrile and ethanol in a dosage ratio of 0.12 g:10 mL.

[0054] The outer fabric is prepared by the following steps:

[0055] Step A1, 0.03 mol of dimethylaminobutanol, 18.2 g of triethylamine and 100 mL of toluene were added to a flask and stirred to mix evenly. Then, 60 mL of methacryloyl chloride toluene solution was transferred to a constant pressure dropping funnel and slowly added dropwise to the flask under ice-water bath and stirring conditions. The addition time was 5 h. After the addition was completed, the mixture was reacted at room temperature for 12 h, filtered, washed, and dried to obtain intermediate 1. The methacryloyl chloride toluene solution was prepared by stirring and mixing methacryloyl chloride and toluene in a ratio of 0.032 mol: 60 mL;

[0056] Step A2: Add intermediate 1 to a reactor, stir at 45°C, add 1-chlorododecane dropwise using a constant pressure separatory funnel at a rate of 5s / drop, and react for 12 hours. The mixture is allowed to stand in the separatory funnel for 12 hours, and the lower layer of liquid is separated, rotated, and freeze-dried for 8 hours to obtain a functional monomer. The molar ratio of intermediate 1 to 1-chlorododecane is 1:1.

[0057] Step A3: Weigh the raw materials by weight, add 90 parts of deionized water, 0.05 parts of OP-10 (emulsifier), 0.2 parts of sodium lauryl sulfate, and 0.08 parts of potassium persulfate to a reactor and stir evenly. Then, add 8 parts of acrylic acid, 5 parts of 2-(perfluorobutyl) ethyl acrylate, 15 parts of methyl methacrylate, 15 parts of functional monomer, and 35 parts of butyl acrylate, stir and mix evenly, and then add to the reactor. React at 85° C. for 5 hours, and cool to room temperature to obtain a polyacrylate emulsion.

[0058] Step A4: Weigh the raw materials by weight, and stir and mix 55 parts of polyacrylate emulsion, 18 parts of modified silica, 1.5 parts of BYK-191 (dispersant), 5 parts of ethylene glycol, 5 parts of polyoxypropylene glycerol ether (defoaming agent), and 30 parts of deionized water to obtain a waterproof and breathable coating.

[0059] Step A5: The yarns are used as warp and weft yarns, immersed in a waterproof and breathable coating, and subjected to a three-dip and three-roll treatment, followed by a drying treatment, and then woven into an outer fabric. The yarns are all spun from a mixture of viscose fiber, polyester fiber, and cotton fiber in a mass ratio of 1:6:4. The density of the warp yarn is 78 yarns / cm, and the density of the weft yarn is 55 yarns / cm.

[0060] Example 4

[0061] A method for preparing a waterproof and breathable fabric comprises the following steps:

[0062] The breathable cotton cloth, the TPU hot melt adhesive film and the outer layer fabric prepared in Example 1 were stacked in sequence and hot pressed and laminated using a hot ironing device to obtain a waterproof and breathable fabric.

[0063] Example 5

[0064] A method for preparing a waterproof and breathable fabric comprises the following steps:

[0065] The breathable cotton cloth, the TPU hot melt adhesive film and the outer layer fabric prepared in Example 2 were stacked in sequence and hot pressed and laminated using a hot ironing device to obtain a waterproof and breathable fabric.

[0066] Example 6

[0067] A method for preparing a waterproof and breathable fabric comprises the following steps:

[0068] The breathable cotton cloth, the TPU hot melt adhesive film and the outer layer fabric prepared in Example 3 were stacked in sequence and hot pressed and laminated using a hot ironing device to obtain a waterproof and breathable fabric.

[0069] Comparative Example 1

[0070] This comparative example is a fabric, which differs from Example 6 in that the waterproof and breathable coating used in the outer fabric prepared in Example 3 is prepared by the following method, and the rest are the same;

[0071] The waterproof breathable coating includes the following steps:

[0072] Step S1, weighing raw materials by weight, adding 90 parts of deionized water, 0.05 parts of OP-10 (emulsifier), 0.2 parts of sodium lauryl sulfate and 0.08 parts of potassium persulfate to a reactor and stirring evenly, then adding 8 parts of acrylic acid, 5 parts of 2-(perfluorobutyl) ethyl acrylate, 30 parts of methyl methacrylate and 35 parts of butyl acrylate, stirring and mixing evenly, adding to the reactor, reacting at 85° C. for 5 hours, and cooling to room temperature to obtain a polyacrylate emulsion;

[0073] Step S2, weighing the raw materials in parts by weight, 55 parts of polyacrylate emulsion, 18 parts of modified silica prepared in Example 3, 1.5 parts of BYK-191 (dispersant), 5 parts of ethylene glycol, 5 parts of polyoxypropylene glycerol ether (defoaming agent) and 30 parts of deionized water were stirred and mixed uniformly to obtain a waterproof and breathable coating.

[0074] Comparative Example 2

[0075] This comparative example is a fabric, which differs from Example 6 in that the waterproof and breathable coating used in the outer fabric prepared in Example 3 is prepared by the following method, and the rest are the same;

[0076] Step S1, weighing raw materials by weight, adding 90 parts of deionized water, 0.05 parts of OP-10 (emulsifier), 0.2 parts of sodium lauryl sulfate and 0.08 parts of potassium persulfate to a reactor and stirring evenly, then adding 8 parts of acrylic acid, 5 parts of 2-(perfluorobutyl) ethyl acrylate, 15 parts of methyl methacrylate, 15 parts of the functional monomer prepared in Example 3 and 35 parts of butyl acrylate, stirring and mixing evenly, adding to a reactor, reacting at 85° C. for 5 hours, and cooling to room temperature to obtain a polyacrylate emulsion;

[0077] Step S2, weighing the raw materials in parts by weight, and stirring and mixing 55 parts of polyacrylate emulsion, 18 parts of silicon dioxide, 1.5 parts of BYK-191 (dispersant), 5 parts of ethylene glycol, 5 parts of polyoxypropylene glycerol ether (defoaming agent) and 30 parts of deionized water to obtain a waterproof and breathable coating.

[0078] The fabrics prepared in Examples 4-6 and Comparative Examples 1-2 were subjected to performance tests:

[0079] Water repellency: AATCC22-2005 "Water Repellency of Textiles - Spray Method" is used to test the water repellency of the fabric surface;

[0080] Air permeability test: GBT5453-1997 "Determination of air permeability of textile fabrics" is used to test the air permeability of the fabric (mm / s);

[0081] Hydrophobicity test: Tested in accordance with GB / T 30693-2014 standard;

[0082] Antistatic performance test: The YC401 fabric induction static tester was used as the test instrument. The test was conducted in an atmosphere with a relative humidity of 65% and a temperature of 23±2°C. The turntable speed was 1500 r / min, the discharge distance between the needle electrode and the sample was 20 mm, and the measurement distance between the test probe and the sample was 15 mm.

[0083] The test results are shown in the following table:

[0084]

[0085] As can be seen from the above table, the fabric prepared by the present invention has excellent waterproof performance, air permeability and antistatic performance, and has broad application prospects.

[0086] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the scope of protection of the present invention.

Claims

1. A waterproof and breathable fabric, characterized in that: It includes an inner layer, an adhesive layer and an outer layer of fabric, wherein the inner layer is a breathable cotton cloth, the adhesive layer is a TPU hot melt adhesive film, and the outer layer of fabric is woven from yarns that have been impregnated with a waterproof and breathable coating; The outer fabric is prepared by the following steps: Step A1, dimethylaminobutanol, triethylamine and toluene were added to a flask and stirred to mix evenly. Then, the methacryloyl chloride toluene solution was transferred to a constant pressure dropping funnel and slowly added dropwise to the flask under ice-water bath and stirring conditions for 4-5 hours. After the addition was completed, the reaction was carried out at room temperature for 12 hours, and then filtered, washed, and dried to obtain Intermediate 1; Step A2: Add intermediate 1 to a reactor, stir at 45°C, add 1-chlorododecane dropwise using a constant pressure separatory funnel at a rate of 5s / drop, and react for 12h. Allow the mixture to stand in the separatory funnel for 12h, separate the lower layer of liquid, rotate, and freeze-dry for 8h to obtain the functional monomer; Step A3, weighing raw materials by weight, adding 80-90 parts of deionized water, 0.01-0.05 parts of OP-10, 0.05-0.2 parts of sodium lauryl sulfate, and 0.01-0.08 parts of potassium persulfate to a reactor and stirring evenly, then adding 3-8 parts of acrylic acid, 2-5 parts of 2-(perfluorobutyl)ethyl acrylate, 10-15 parts of methyl methacrylate, 8-15 parts of functional monomer, and 25-35 parts of butyl acrylate, stirring and mixing evenly, and then adding to a reactor, reacting at 45-85° C. for 3-5 hours, and cooling to room temperature to obtain a polyacrylate emulsion; Step A4: weighing raw materials in parts by weight, and uniformly mixing 35-55 parts of polyacrylate emulsion, 10-18 parts of modified silica, 0.5-1.5 parts of BYK-191, 3-5 parts of ethylene glycol, 3-5 parts of polyoxypropylene glycerol ether, and 20-30 parts of deionized water to obtain a waterproof and breathable coating; Step A5: The yarns are used as warp and weft yarns, immersed in the waterproof and breathable coating, and subjected to a three-dip and three-roll process, followed by drying, and then woven into an outer fabric.

2. The waterproof and breathable fabric according to claim 1, characterized in that: In step A1, the amount ratio of dimethylaminobutanol, triethylamine, toluene and methacryloyl chloride toluene solution is 0.01-0.03 mol:6.1-18.2 g:100 mL:60 mL, and the methacryloyl chloride toluene solution is prepared by stirring and mixing methacryloyl chloride and toluene in an amount ratio of 0.012-0.032 mol:60 mL.

3. The waterproof and breathable fabric according to claim 1, characterized in that: The molar ratio of intermediate 1 to 1-chlorododecane in step A2 is 1:

1.

4. The waterproof and breathable fabric according to claim 1, characterized in that: The yarns in step A5 are all made by mixing viscose fiber, polyester fiber and cotton fiber in a mass ratio of 1:4-6:3-4, with a warp density of 68-78 yarns / cm and a weft density of 45-55 yarns / cm.

5. The waterproof and breathable fabric according to claim 1, characterized in that: The modified silicon dioxide is prepared by the following steps: Step B1, sodium lauryl sarcosinate is added to a flask containing deionized water and stirred for 10 minutes, then 0.1 mol / L hydrochloric acid is added and stirred for 30 minutes, and then ethyl orthosilicate is added and stirred for 30-60 minutes. The mixture is allowed to stand at room temperature for 4-6 hours, and then the system temperature is increased to 70-80°C and allowed to stand for 24 hours. The mixture is centrifuged, washed, dried, and the product is collected. The product is then redispersed in a mixture of ethanolamine and ethanol, and extracted under reflux in an oil bath at 90°C for 12 hours. The extraction is then repeated once, and the mixture is centrifuged, washed, and dried to obtain mesoporous silica. Step B2: Add lauryl acrylate, 3-(isobutyleneoxy)propyltrimethoxysilane, and ethanol into a beaker and stir to mix evenly, which is recorded as mixed solution 1; then ultrasonically disperse the mesoporous silica in ethanol, add the mixed solution 1 and stir to mix evenly, then add the ethanol solution of azobisisobutyronitrile, and increase the system temperature to 65-75°C for 3.5-4.5 hours. Centrifuge, wash, and dry to obtain modified silica.

6. The waterproof and breathable fabric according to claim 5, characterized in that: In step B1, the usage ratio of sodium lauryl sarcosinate, deionized water, hydrochloric acid, ethyl orthosilicate, ethanolamine and ethanol is 0.6-1.2 g:120 mL:4-8 g:3.2-6.4 mL:40 mL:160 mL.

7. The waterproof and breathable fabric according to claim 5, characterized in that: In step B2, the usage ratio of mesoporous silica, ethanol, mixed solution 1 and azobisisobutyronitrile ethanol solution is 1-2 g: 20 mL: 25 mL: 10 mL.

8. The waterproof and breathable fabric according to claim 7, characterized in that: The ratio of lauryl acrylate, 3-(isomethacryloyloxy)propyltrimethoxysilane and ethanol in the mixed solution 1 used in step B2 is 0.065-0.13 mol: 0.004-0.008 mol: 25 mL.

9. The waterproof and breathable fabric according to claim 7, characterized in that: The azobisisobutyronitrile ethanol solution in step B2 is prepared by stirring and mixing azobisisobutyronitrile and ethanol in a ratio of 0.06-0.12 g:10 mL.

10. The method for preparing a waterproof and breathable fabric according to claim 1, characterized in that: The following steps are involved: The breathable cotton cloth, TPU hot melt adhesive film and outer fabric are stacked in sequence and hot pressed and laminated using hot ironing equipment to obtain a waterproof and breathable fabric.

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