A windproof and breathable composite fabric and its preparation method and application

Abstract

The present invention relates to a windproof and breathable composite fabric and its preparation method and application, belonging to the technical field of fabrics, comprising an inner substrate, a nano breathable film layer attached to one surface of the inner substrate by vacuum coating, a nano waterproof layer composited on the nano breathable film layer, and a nano antibacterial layer composited on the other surface of the inner substrate; wherein the nano waterproof layer is obtained by weaving a modified waterborne polyurethane emulsion and a modified polyimide fiber after being treated with a finishing liquid, and the modified waterborne polyurethane emulsion is mixed with trimethylhexane diisocyanate, dihydroxy polyether, a modified porogen, and glycidyl ether, and synthesized by hydrophilic chain extension, neutralization, and emulsification; the nano antibacterial layer is obtained by weaving a modified polyacrylonitrile fiber and an antibacterial finishing agent after being treated with an emulsion. The composite fabric prepared by the present invention using a nano waterproof layer, a nano antibacterial layer, and a nano breathable film layer has the characteristics of good air and moisture permeability, good antibacterial property, and high softness.

Description

Technical Field

[0001] The invention belongs to the technical field of fabrics, and in particular relates to a windproof and rainproof breathable composite fabric and a preparation method and application thereof. Background Art

[0002] With the advancement of equipment and the development of material technology, clothing materials and fabrics are constantly being updated. People have an increasing demand for textiles with multiple functions such as good waterproofness, good breathability, antibacterial and radiation protection, and their applications are becoming more and more extensive.

[0003] Among functional textile fabrics, waterproof and breathable fabrics are products with relatively high difficulty and high technical content. In order to have more functions, the fabrics in the prior art need to add coatings while maintaining the original fabric properties. However, blindly adding coatings will reduce the breathability of the fabrics. In actual use, such functional composite fabrics are stuffy and not breathable when worn, making users feel uncomfortable, which affects the comfort and warmth of wearing to a considerable extent. Therefore, a windproof and breathable composite fabric and its preparation method and application are designed. Summary of the invention

[0004] The purpose of the present invention is to provide a windproof and breathable composite fabric to solve the above problems, which can make the fabric have good air permeability, good moisture permeability, good antibacterial properties, and at the same time have strong softness and certain insecticidal and sterilization effects.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A windproof and breathable composite fabric and its application, comprising an inner substrate, a nano breathable film layer attached to the inner substrate by vacuum coating, a nano waterproof layer composited on the nano breathable film layer, and a nano antibacterial layer composited on the inner substrate;

[0007] The nano waterproof layer is obtained by weaving a modified waterborne polyurethane emulsion and a modified polyimide fiber after being treated with a finishing liquid. The modified waterborne polyurethane emulsion is mixed with trimethylhexane diisocyanate, dihydroxy polyether, a modified porogen, and glycidyl ether, and synthesized by hydrophilic chain extension, neutralization, and emulsification.

[0008] The nano antibacterial layer is obtained by treating modified polyacrylonitrile fiber and an antibacterial finishing agent with an emulsion and then drying the emulsion.

[0009] As a further improvement of the present invention, the inner layer base material is made of one of cotton fiber, polyvinyl chloride fiber and regenerated fiber.

[0010] As a further improvement of the present invention, the nano breathable membrane layer is obtained by mixing polyvinylidene fluoride, talcum powder particles and foaming agent particle powder with additives, and forming micropores after extrusion and stretching by an extruder.

[0011] As a further improvement of the present invention, the antibacterial finishing agent is one of a zeolite antibacterial agent, a phosphate complex antibacterial agent, a silica gel antibacterial agent and a synthetic antibacterial agent.

[0012] The preparation method of the windproof and breathable composite fabric is as follows:

[0013] (1) firstly treating the polyimide fiber with a plasma generator, then mixing and impregnating the fiber with a solution of a maleic anhydride grafting compatibilizer having a concentration of 3% to 5% for 2 to 5 minutes, pre-baking and baking, the pre-baking temperature is 40 to 70° C., the pre-baking time is 4 to 8 minutes, the baking temperature is 110 to 140° C., the baking time is 3 to 5 minutes, and then the fiber is fully washed and dried at 110 to 140° C. to obtain a modified polyimide fiber;

[0014] Then, trimethylhexane diisocyanate and dihydroxy polyether are mixed and reacted to prepare waterborne polyurethane elastomer, and then modified porogen and glycidyl ether are added, and hydrophilic chain extension, neutralization and emulsification are performed to synthesize modified waterborne polyurethane emulsion;

[0015] The modified polyurethane emulsion is added into the dipping tank, and then the modified polyimide fiber is immersed therein for 10 to 15 minutes. The modified polyimide fiber treated with the modified polyurethane emulsion is woven by a textile machine to obtain a nano waterproof layer.

[0016] (2) 50-70 g / L of the antibacterial finishing agent is dissolved in 2-ethylhexyl hexadecanoate to prepare an emulsion, and then the modified polyacrylonitrile fiber is fully immersed in the emulsion, the temperature is controlled at 80-90°C, the time is controlled at 10-20 min, and then it is vulcanized with copper sulfate, rolled, and dried to obtain a nano antibacterial layer.

[0017] (3) placing the polyvinylidene fluoride raw material in a dehumidifying dryer, stirring and melting, adding talcum powder particles, foaming agent particle powder and additives, extruding through an extruder, and rolling into a polyvinylidene fluoride roll;

[0018] (4) firstly stretching the polyvinylidene fluoride roll transversely by 2 to 3 times or longitudinally by 2 to 3 times, and then rolling and vibrating the roll using a rolling machine to separate the talcum powder particles and the foaming agent particle powder from the polyvinylidene fluoride film layer, and then forming micropores at the locations of the talcum powder particles and the foaming agent particle powder after separation, thereby obtaining a nano breathable film layer;

[0019] (5) The nano-breathable film layer is first coated on the surface of the inner substrate by vacuum coating, and then the nano-waterproof layer and the nano-antibacterial layer are respectively composited on the nano-breathable film layer and the inner substrate by hot pressing to obtain a finished fabric.

[0020] As a further improvement of the present invention, in the step (1), the weight proportion of trimethylhexane diisocyanate is 20 to 30 parts, the weight proportion of dihydroxy polyether is 20 to 30 parts, during mixing and stirring, the heating temperature is controlled to be 80 to 90° C., and the reaction time is 1.5 to 2 hours.

[0021] As a further improvement of the present invention, the type of the additive in step (3) is any one of sodium bicarbonate and ammonium bicarbonate.

[0022] The present invention also provides an application of the preparation method of the above-mentioned windproof and rainproof breathable composite fabric in fire-fighting clothing or anti-static clothing.

[0023] The beneficial effects of the present invention are:

[0024] 1) The present invention heat-presses and composites a nano waterproof layer on a nano breathable membrane layer, wherein the nano waterproof layer is prepared by first treating a polyimide fiber with a solution of a grafting agent using a plasma generator to prepare a modified polyimide fiber, then mixing trimethylhexane diisocyanate and dihydroxy polyether to prepare a waterborne polyurethane elastomer, adding a modified porogen and glycidyl ether, and synthesizing a modified waterborne polyurethane emulsion through hydrophilic chain extension, neutralization, and emulsification, and immersing the modified polyimide fiber in the emulsion to obtain the fabric. The above method gives the fabric the characteristics of good air permeability and good moisture permeability;

[0025] 2) The present invention heat-presses the nano antibacterial layer on the inner substrate, wherein the nano antibacterial layer is prepared by dissolving the antibacterial finishing agent in 2-ethylhexyl hexadecanoate to form an emulsion, and then the modified polyacrylonitrile fiber is fully immersed in the emulsion, and the modified polyacrylonitrile fiber is reduced with copper sulfate to coordinate and chelate the nitrile group with the copper ion, thereby imparting antibacterial and deodorizing properties;

[0026] 3) In the present invention, a nano breathable film layer is coated on the surface of the inner substrate by vacuum coating, wherein the nano breathable film layer is formed by adding talcum powder particles and foaming agent particle powder to polyvinylidene fluoride, and the talcum powder particles and foaming agent particle powder are combined with the polyvinylidene fluoride matrix being formed during the stretching process, and the talcum powder particles and foaming agent particle powder are decomposed by heat, and a part of the talcum powder particles and foaming agent particle powder is separated from the polyvinylidene fluoride film layer. After separation, micropores are formed locally at the location where the original talcum powder particles and foaming agent particle powder are located, thereby increasing the breathability of the fabric, and at the same time, the hydrous magnesium silicate can improve the tensile strength, bending strength and impact strength, and extend the service life;

[0027] In summary, the waterproof and rain-permeable composite fabric prepared by the above method has good air permeability, good moisture permeability, and good antibacterial properties. It also has strong softness and certain insecticidal and sterilization effects, and is suitable for fire-fighting and anti-static workers to wear. DETAILED DESCRIPTION

[0028] The present application is described in further detail below. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] Example 1

[0030] The windproof and breathable composite fabric in this embodiment includes an inner substrate, a nano breathable film layer attached to the inner substrate by vacuum coating, a nano waterproof layer composited on the nano breathable film layer, and a nano antibacterial layer composited on the inner substrate.

[0031] The inner base material is made of cotton fiber.

[0032] The preparation method of the windproof and breathable composite fabric is as follows:

[0033] (1) firstly treating the polyimide fiber with a plasma generator, then mixing and impregnating the fiber with a solution of a 3% maleic anhydride grafting compatibilizer for 2 minutes, pre-baking and baking, the pre-baking temperature is 40° C., the pre-baking time is 4 minutes, the baking temperature is 110° C., the baking time is 3 minutes, and then the fiber is fully washed and dried at 110° C. to obtain a modified polyimide fiber;

[0034] Then, 20 parts by weight of trimethylhexane diisocyanate and 30 parts by weight of dihydroxy polyether are mixed, stirred and heated, the reaction temperature is controlled to be 80° C., and the reaction time is 1.5 hours to prepare a waterborne polyurethane elastomer, and then a modified porogen and glycidyl ether are added, and the modified waterborne polyurethane emulsion is synthesized through hydrophilic chain extension, neutralization and emulsification;

[0035] The modified polyurethane emulsion is added into the dipping tank, and then the modified polyimide fiber is immersed therein for 10 minutes. The modified polyimide fiber treated with the modified polyurethane emulsion is woven by a textile machine to obtain a nano waterproof layer.

[0036] (2) 50 g / L zeolite antibacterial agent was dissolved in 2-ethylhexyl hexadecanoate to prepare an emulsion, and then the modified polyacrylonitrile fiber was fully immersed in the emulsion at a temperature of 80°C and a time of 10 min. After copper sulfate sulfide, impregnation and drying, a nano antibacterial layer was obtained.

[0037] (3) placing the polyvinylidene fluoride raw material in a dehumidifying dryer, stirring and melting, adding talcum powder particles, foaming agent particle powder and sodium bicarbonate, extruding through an extruder, and rolling into a polyvinylidene fluoride roll;

[0038] (4) The polyvinylidene fluoride roll is first stretched transversely by 2 to 3 times or longitudinally by 2 to 3 times, and then rolled and vibrated by a rolling machine to separate the talcum powder particles and the foaming agent particle powder from the polyvinylidene fluoride film layer. After separation, micropores are formed at the locations of the talcum powder particles and the foaming agent particle powder to obtain a nano breathable film layer.

[0039] (5) The nano-breathable film layer is first coated on the surface of the inner substrate by vacuum coating, and then the nano-waterproof layer and the nano-antibacterial layer are respectively composited on the nano-breathable film layer and the inner substrate by hot pressing to obtain a finished fabric.

[0040] Example 2

[0041] The windproof and breathable composite fabric in this embodiment includes an inner substrate, a nano breathable film layer attached to the inner substrate by vacuum coating, a nano waterproof layer composited on the nano breathable film layer, and a nano antibacterial layer composited on the inner substrate.

[0042] The inner base material is made of polyvinyl chloride fiber.

[0043] The preparation method of the windproof and breathable composite fabric is as follows:

[0044] (1) firstly treating the polyimide fiber with a plasma generator, then mixing and impregnating with a solution of a 4% maleic anhydride grafting compatibilizer for 3 minutes, pre-baking and baking, the pre-baking temperature is 55° C., the pre-baking time is 6 minutes, the baking temperature is 120° C., the baking time is 4 minutes, and then after being fully washed with water, drying at 120° C., a modified polyimide fiber is obtained;

[0045] Then, 30 parts by weight of trimethylhexane diisocyanate and 20 parts by weight of dihydroxy polyether are mixed, stirred and heated, and the reaction temperature is controlled to be 85° C. and the reaction time is 1.8 hours to prepare a waterborne polyurethane elastomer, and then a modified porogen and glycidyl ether are added, and the modified waterborne polyurethane emulsion is synthesized through hydrophilic chain extension, neutralization and emulsification;

[0046] The modified polyurethane emulsion is added into the dipping tank, and then the modified polyimide fiber is immersed therein for 12 minutes. The modified polyimide fiber treated with the modified polyurethane emulsion is woven by a textile machine to obtain a nano waterproof layer.

[0047] (2) 60 g / L phosphate antibacterial agent was dissolved in 2-ethylhexyl hexadecanoate to prepare an emulsion, and then the modified polyacrylonitrile fiber was fully immersed in the emulsion at a temperature of 85 ° C and a time of 15 min. After copper sulfate vulcanization, padding, and drying, a nano antibacterial layer was obtained.

[0048] (3) placing the polyvinylidene fluoride raw material in a dehumidifying dryer, stirring and melting, adding talcum powder particles, foaming agent particle powder and ammonium bicarbonate, extruding through an extruder, and rolling into a polyvinylidene fluoride roll;

[0049] (4) The polyvinylidene fluoride roll is first stretched transversely by 2 to 3 times or longitudinally by 2 to 3 times, and then rolled and vibrated by a rolling machine to separate the talcum powder particles and the foaming agent particle powder from the polyvinylidene fluoride film layer. After separation, micropores are formed at the locations of the talcum powder particles and the foaming agent particle powder to obtain a nano breathable film layer.

[0050] (5) The nano-breathable film layer is first coated on the surface of the inner substrate by vacuum coating, and then the nano-waterproof layer and the nano-antibacterial layer are respectively composited on the nano-breathable film layer and the inner substrate by hot pressing to obtain a finished fabric.

[0051] Example 3

[0052] The windproof and breathable composite fabric in this embodiment includes an inner substrate, a nano waterproof layer and a nano antibacterial layer composited on the inner substrate, and a nano breathable film layer attached to the inner substrate by vacuum coating.

[0053] The inner base material is made of recycled fiber.

[0054] The preparation method of the windproof and breathable composite fabric is as follows:

[0055] (1) firstly treating the polyimide fiber with a plasma generator, then mixing and impregnating with a solution of a 5% maleic anhydride grafting compatibilizer for 5 minutes, pre-baking and baking, the pre-baking temperature is 70°C, the pre-baking time is 8 minutes, the baking temperature is 140°C, the baking time is 5 minutes, and then after being fully washed with water, drying at 140°C to obtain a modified polyimide fiber;

[0056] Then, 25 parts by weight of trimethylhexane diisocyanate and 25 parts by weight of dihydroxy polyether are mixed, stirred, and heated, and the reaction temperature is controlled to be 90° C. and the reaction time is 2 hours to prepare a waterborne polyurethane elastomer, and then a modified porogen and glycidyl ether are added, and the modified waterborne polyurethane emulsion is synthesized through hydrophilic chain extension, neutralization, and emulsification;

[0057] The modified polyurethane emulsion is added into the dipping tank, and then the modified polyimide fiber is immersed therein for 15 minutes. The modified polyimide fiber treated with the modified polyurethane emulsion is woven by a textile machine to obtain a nano waterproof layer.

[0058] (2) 70 g / L of silica gel antibacterial agent was dissolved in 2-ethylhexyl hexadecanoate to prepare an emulsion, and then the modified polyacrylonitrile fiber was fully immersed in the emulsion at a temperature of 90 °C and a time of 20 min. After that, the fiber was subjected to copper sulfate vulcanization, padding, and drying to obtain a nano antibacterial layer.

[0059] (3) placing the polyvinylidene fluoride raw material in a dehumidifying dryer, stirring and melting, adding talcum powder particles, foaming agent particle powder and ammonium bicarbonate, extruding through an extruder, and rolling into a polyvinylidene fluoride roll;

[0060] (4) The polyvinylidene fluoride roll is first stretched transversely by 2 to 3 times or longitudinally by 2 to 3 times, and then rolled and vibrated by a rolling machine to separate the talcum powder particles and the foaming agent particle powder from the polyvinylidene fluoride film layer. After separation, micropores are formed at the locations of the talcum powder particles and the foaming agent particle powder to obtain a nano breathable film layer.

[0061] (5) The nano-breathable film layer is first coated on the surface of the inner substrate by vacuum coating, and then the nano-waterproof layer and the nano-antibacterial layer are respectively composited on the nano-breathable film layer and the inner substrate by hot pressing to obtain a finished fabric.

[0062] In order to verify the effect of the present invention, the following experiments were conducted on Examples 1 to 3, and Comparative Examples 1, 2 and 3 were set for comparison, as follows:

[0063] Comparative Example 1

[0064] (1) firstly treating the polyimide fiber with a plasma generator, then mixing and impregnating the fiber with a solution of a 3% maleic anhydride grafting compatibilizer for 2 minutes, pre-baking and baking, the pre-baking temperature is 40° C., the pre-baking time is 4 minutes, the baking temperature is 110° C., the baking time is 3 minutes, and then the fiber is fully washed and dried at 110° C. to obtain a modified polyimide fiber;

[0065] Then, 20 parts by weight of 4,4-diphenylmethane diisocyanate and 30 parts by weight of dihydroxy polyether are mixed, stirred and heated, and the reaction temperature is controlled to be 80° C. and the reaction time is 1.5 hours to prepare a waterborne polyurethane elastomer, and then a modified porogen and glycidyl ether are added, and the modified waterborne polyurethane emulsion is synthesized through hydrophilic chain extension, neutralization and emulsification;

[0066] The modified polyurethane emulsion is added into the dipping tank, and then the modified polyimide fiber is immersed therein for 10 minutes. The modified polyimide fiber treated with the modified polyurethane emulsion is woven by a textile machine to obtain a nano waterproof layer.

[0067] (2) 50 g / L zeolite antibacterial agent was dissolved in 2-ethylhexyl hexadecanoate to prepare an emulsion, and then the modified polyacrylonitrile fiber was fully immersed in the emulsion at a temperature of 80°C and a time of 10 min. After copper sulfate sulfide, impregnation and drying, a nano antibacterial layer was obtained.

[0068] (3) placing the polyvinylidene fluoride raw material in a dehumidifying dryer, stirring and melting, adding talcum powder particles, foaming agent particle powder and sodium bicarbonate, extruding through an extruder, and rolling into a polyvinylidene fluoride roll;

[0069] (4) The polyvinylidene fluoride roll is first stretched transversely by 2 to 3 times or longitudinally by 2 to 3 times, and then rolled and vibrated by a rolling machine to separate the talcum powder particles and the foaming agent particle powder from the polyvinylidene fluoride film layer. After separation, micropores are formed at the locations of the talcum powder particles and the foaming agent particle powder to obtain a nano breathable film layer.

[0070] (5) The nano-breathable film layer is first coated on the surface of the inner substrate by vacuum coating, and then the nano-waterproof layer and the nano-antibacterial layer are respectively composited on the nano-breathable film layer and the inner substrate by hot pressing to obtain a finished fabric.

[0071] Comparative Example 2

[0072] (1) firstly treating the polyimide fiber with a plasma generator, then mixing and impregnating with a solution of a 4% maleic anhydride grafting compatibilizer for 3 minutes, pre-baking and baking, the pre-baking temperature is 55° C., the pre-baking time is 6 minutes, the baking temperature is 120° C., the baking time is 4 minutes, and then after being fully washed with water, drying at 120° C., a modified polyimide fiber is obtained;

[0073] Then, 30 parts by weight of 4,4-diphenylmethane diisocyanate and 20 parts by weight of dihydroxy polyether are mixed, stirred and heated, and the reaction temperature is controlled to be 85° C. and the reaction time is 1.8 hours to prepare a waterborne polyurethane elastomer, and then a modified porogen and glycidyl ether are added, and the modified waterborne polyurethane emulsion is synthesized through hydrophilic chain extension, neutralization and emulsification;

[0074] The modified polyurethane emulsion is added into the dipping tank, and then the modified polyimide fiber is immersed therein for 12 minutes. The modified polyimide fiber treated with the modified polyurethane emulsion is woven by a textile machine to obtain a nano waterproof layer.

[0075] (2) 60 g / L phosphate antibacterial agent was dissolved in 2-ethylhexyl hexadecanoate to prepare an emulsion, and then the modified polyacrylonitrile fiber was fully immersed in the emulsion at a temperature of 85 ° C and a time of 15 min. After copper sulfate vulcanization, padding, and drying, a nano antibacterial layer was obtained.

[0076] (3) placing the polyvinylidene fluoride raw material in a dehumidifying dryer, stirring and melting, adding talcum powder particles, foaming agent particle powder and ammonium bicarbonate, extruding through an extruder, and rolling into a polyvinylidene fluoride roll;

[0077] (4) The polyvinylidene fluoride roll is first stretched transversely by 2 to 3 times or longitudinally by 2 to 3 times, and then rolled and vibrated by a rolling machine to separate the talcum powder particles and the foaming agent particle powder from the polyvinylidene fluoride film layer. After separation, micropores are formed at the locations of the talcum powder particles and the foaming agent particle powder to obtain a nano breathable film layer.

[0078] (5) The nano-breathable film layer is first coated on the surface of the inner substrate by vacuum coating, and then the nano-waterproof layer and the nano-antibacterial layer are respectively composited on the nano-breathable film layer and the inner substrate by hot pressing to obtain a finished fabric.

[0079] Comparative Example 3

[0080] (1) firstly treating the polyimide fiber with a plasma generator, then mixing and impregnating the fiber with a solution of a 5% maleic anhydride grafting compatibilizer for 5 minutes, pre-baking and baking, the pre-baking temperature is 70°C, the pre-baking time is 8 minutes, the baking temperature is 140°C, the baking time is 3 to 5 minutes, and then the fiber is fully washed and dried at 140°C to obtain a modified polyimide fiber;

[0081] Then, 25 parts by weight of 4,4-diphenylmethane diisocyanate and 25 parts by weight of dihydroxy polyether are mixed, stirred, and heated, and the reaction temperature is controlled to be 90° C. and the reaction time is 2 hours to prepare a waterborne polyurethane elastomer, and then a modified porogen and glycidyl ether are added, and the modified waterborne polyurethane emulsion is synthesized through hydrophilic chain extension, neutralization, and emulsification;

[0082] The modified polyurethane emulsion is added into the dipping tank, and then the modified polyimide fiber is immersed therein for 15 minutes. The modified polyimide fiber treated with the modified polyurethane emulsion is woven by a textile machine to obtain a nano waterproof layer.

[0083] (2) 70 g / L of silica gel antibacterial agent was dissolved in 2-ethylhexyl hexadecanoate to prepare an emulsion, and then the modified polyacrylonitrile fiber was fully immersed in the emulsion at a temperature of 90 °C and a time of 20 min. After that, the fiber was subjected to copper sulfate vulcanization, padding, and drying to obtain a nano antibacterial layer.

[0084] (3) placing the polyvinylidene fluoride raw material in a dehumidifying dryer, stirring and melting, adding talcum powder particles, foaming agent particle powder and ammonium bicarbonate, extruding through an extruder, and rolling into a polyvinylidene fluoride roll;

[0085] (4) The polyvinylidene fluoride roll is first stretched transversely by 2 to 3 times or longitudinally by 2 to 3 times, and then rolled and vibrated by a rolling machine to separate the talcum powder particles and the foaming agent particle powder from the polyvinylidene fluoride film layer. After separation, micropores are formed at the locations of the talcum powder particles and the foaming agent particle powder to obtain a nano breathable film layer.

[0086] (5) The nano-breathable film layer is first coated on the surface of the inner substrate by vacuum coating, and then the nano-waterproof layer and the nano-antibacterial layer are respectively composited on the nano-breathable film layer and the inner substrate by hot pressing to obtain a finished fabric.

[0087] For the composite fabrics prepared in Examples 1 to 3 and Comparative Examples 1 to 3, samples of the same area were taken and performance tests were performed using GB / T3923.1-2013 "Determination of air permeability of textile fabrics", GB / T 2791-1995 "Determination of stripping rate of textile fabrics", GB / T 16928-1997 "Determination of moisture permeability of textile fabrics", GB / T 3923.1-2013 "Determination of tensile properties of textile fabrics", GB / T 21196.2-2007 "Determination of wear resistance of textiles", and GB / T 3923.1-2013 "Determination of elongation at break of textile fabrics". The specific test results are shown in Table 1 below.

[0088]

[0089] It can be seen from the above table that, under the same sample and the same conditions, the nano waterproof layer obtained by immersing the modified polyimide fiber in the modified waterborne polyurethane emulsion prepared by trimethylhexane diisocyanate and dihydroxy polyether as raw materials has a higher air permeability and better moisture permeability than the nano waterproof layer obtained by immersing the modified polyimide fiber in the modified waterborne polyurethane emulsion prepared by 4,4-diphenylmethane diisocyanate and dihydroxy polyether as raw materials.

[0090] Among them, the test results of peeling force, abrasion resistance and elongation at break of the composite fabrics prepared in Examples 1 to 3 and Comparative Examples 1 to 3 are not much different.

[0091] In summary, the waterproof and rain-permeable composite fabric prepared by the above method of the present invention has good air permeability, good moisture permeability, good antibacterial property, strong tear resistance, and at the same time has strong softness and certain insecticidal and sterilization effects.

[0092] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for preparing a windproof and breathable composite fabric, characterized in that: The composite fabric comprises an inner substrate, a nano breathable membrane layer attached to one surface of the inner substrate, a nano waterproof layer composited on the nano breathable membrane layer, and a nano antibacterial layer composited on the other surface of the inner substrate; the preparation method comprises the following steps: (1) firstly treating the polyimide fiber with a plasma generator, then mixing and impregnating with a solution of a maleic anhydride grafting compatibilizer with a concentration percentage of 3%-5% for 2-5 minutes, pre-baking and baking, the pre-baking temperature is 40-70°C, the pre-baking time is 4-8 minutes, the baking temperature is 110-140°C, the baking time is 3-5 minutes, and then after being fully washed with water, drying at 110-140°C to obtain a modified polyimide fiber; Then, trimethylhexane diisocyanate and dihydroxy polyether are mixed and reacted to prepare a waterborne polyurethane elastomer, and then a modified porogen and glycidyl ether are added, and the modified waterborne polyurethane emulsion is synthesized through hydrophilic chain extension, neutralization and emulsification. Adding the modified polyurethane emulsion into a padding tank, and then immersing the modified polyimide fiber therein for 10-15 minutes, and weaving the modified polyimide fiber treated with the modified polyurethane emulsion through a weaving machine to obtain a nano waterproof layer; Wherein, the weight proportion of trimethylhexane diisocyanate is 20-30 parts, the weight proportion of dihydroxy polyether is 20-30 parts, during mixing and stirring, the heating temperature is controlled at 80-90°C, and the reaction time is 1.5-2h; (2) dissolving 50-70 g / L of an antibacterial finishing agent in 2-ethylhexyl hexadecanoate to prepare an emulsion, and then fully immersing the modified polyacrylonitrile fiber in the emulsion, controlling the temperature to 80-90° C. and the time to 10-20 min, and then performing copper sulfate coordination chelation, padding, and drying to obtain a nano antibacterial layer; (3) placing the polyvinylidene fluoride raw material in a dehumidifying dryer, stirring and melting it, adding talcum powder particles, foaming agent particle powder and additives, extruding it through an extruder, and rolling it into a polyvinylidene fluoride roll; wherein the type of the additive is any one of sodium bicarbonate and ammonium bicarbonate; (4) The polyvinylidene fluoride roll is first stretched transversely by 2-3 times or longitudinally by 2-3 times, and then rolled and vibrated by a rolling machine to separate the talcum powder particles and the foaming agent particle powder from the polyvinylidene fluoride film layer. After separation, micropores are formed at the locations of the talcum powder particles and the foaming agent particle powder to obtain a nano breathable film layer; (5) Covering a nano-breathable membrane layer on one surface of the inner substrate, and then compounding a nano-waterproof layer and a nano-antibacterial layer on the nano-breathable membrane layer and the other surface of the inner substrate by hot pressing, to obtain a finished fabric.

2. The method for preparing a windproof and breathable composite fabric according to claim 1, characterized in that: The inner layer base material is made of one of cotton fiber, polyvinyl chloride fiber and regenerated fiber.

3. The method for preparing the windproof and breathable composite fabric according to claim 1, characterized in that: The nano breathable membrane layer is obtained by mixing polyvinylidene fluoride, talcum powder particles, foaming agent particle powder and additives, and forming micropores after extrusion and stretching by an extruder.

4. The method for preparing a windproof and breathable composite fabric according to claim 1, characterized in that: The antibacterial finishing agent is one of a zeolite antibacterial agent, a phosphate complex antibacterial agent, a silica gel antibacterial agent and a synthetic antibacterial agent.

5. A windproof and breathable composite fabric, characterized in that: The invention is prepared by the preparation method according to any one of claims 1 to 4.

6. Use of the windproof and rainproof breathable composite fabric as claimed in claim 5 in fire-fighting clothing or anti-static clothing.

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