A waterproof and high-permeable jacket fabric and a preparation method thereof

Abstract

The application discloses a kind of strong waterproof high moisture-permeable jacket fabric and preparation method thereof, it is related to fabric technical field.The preparation includes the following steps: step 1: the preparation of TPU film: the spinning solution A and spinning solution B containing different porous chitosan microspheres proportion are formulated;Spinning solution A is spun, and inner layer is obtained;Aldehyde group modified porous chitosan microspheres solution is coated on one side thereof, with the coating surface as receiving layer, spinning solution B is spun on the surface thereof, and outer layer is obtained, dried to obtain composite base film;The composite base film is placed in keratinase solution, pretreated;Then 3-sulfopropyl acrylate potassium salt mixed solution is coated on the surface of outer layer, and ultraviolet light is irradiated at room temperature;Immersed in deionized water, dried to obtain TPU film;Step 2: TPU film is hot-pressed with shuttle fabric to obtain jacket fabric.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to a highly waterproof and breathable windbreaker fabric and its preparation method. Background Technology

[0002] In recent years, the popularity of outdoor sports has led to an increased demand for outdoor sports equipment such as waterproof jackets. Among them, the fabric of waterproof jackets usually needs to have the functions of waterproofing, breathability, and warmth.

[0003] In existing technologies, polyurethane is a polymer material formed from polyisocyanates and polyhydroxy polymers. It possesses wear resistance, high elasticity, and high elongation, making it well-suited for various clothing styles and environmental applications. Therefore, polyurethane-based membranes, such as TPU films, are widely used in outdoor sports. Currently, polyurethane films used in outdoor jacket fabrics typically have microporous structures, allowing water molecules to pass through, thus achieving breathability and moisture permeability. However, existing polyurethane films have the following drawbacks: generally, increasing porosity is necessary to improve moisture permeability, but this often leads to a decrease in mechanical properties such as tensile strength; on the other hand, not increasing porosity affects breathability and moisture permeability. Furthermore, existing polyurethane films generally do not improve the warmth retention of outdoor jacket fabrics.

[0004] In conclusion, it is of great significance to overcome the shortcomings of existing technologies and develop a new type of outdoor jacket fabric. Summary of the Invention

[0005] The purpose of this invention is to provide a highly waterproof and breathable waterproof jacket fabric and its preparation method, so as to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for preparing a highly waterproof and breathable outdoor jacket fabric includes the following steps:

[0008] Step 1: Preparation of TPU film:

[0009] S1-1: Polyacrylonitrile and hydrophilic thermoplastic polyurethane elastomer are added sequentially to N,N-dimethylformamide, and porous chitosan microspheres of different proportions are added. The mixture is stirred at 55~60℃ for 4~5 hours to obtain spinning solution A and spinning solution B.

[0010] S1-2: Spinning solution A to obtain an inner layer; coating one side of it with aldehyde-modified porous chitosan microsphere solution, using the coated surface as a receiving layer, spinning solution B on its surface to obtain an outer layer; drying it at 60~70℃ for 2~4 hours to obtain a composite base film;

[0011] S1-3: Place the composite base film in a keratinase solution and pretreat it at 40-45℃ for 6-8 hours; then coat the outer surface of the film with a mixture of potassium 3-sulfopropyl acrylate and irradiate it with ultraviolet light at room temperature for 1-2 hours; immerse it in deionized water for 1-2 days and dry it to obtain a TPU film.

[0012] Step 2: Heat-press the TPU film with the woven fabric to obtain the jacket fabric.

[0013] Among them, woven fabrics are made of bicomponent composite fiber yarns interwoven together, and bicomponent composite fibers include, but are not limited to, T800 elastic yarns.

[0014] The windbreaker fabric prepared in this application can be combined with other fabrics to further expand the functionality of the composite fabric. Other fabrics include, but are not limited to, knitted fabrics and waterproof fabrics.

[0015] More preferably, the spinning solution A comprises the following raw materials in parts by weight: 4-5 parts polyacrylonitrile, 6-7 parts hydrophilic thermoplastic polyurethane elastomer, 3-4 parts porous chitosan microspheres, and 84-87 parts N,N-dimethylformamide; the spinning solution B comprises the following raw materials in parts by weight: 4-5 parts polyacrylonitrile, 6-7 parts hydrophilic thermoplastic polyurethane elastomer, 6-8 parts porous chitosan microspheres, and 80-84 parts N,N-dimethylformamide.

[0016] In a more optimized manner, the spinning parameters of the spinning solution A are: voltage of 18~20kV, receiving distance of 18~20cm, and jetting speed of 0.1~0.11mL / min; and the spinning parameters of the spinning solution B are: voltage of 14~16kV, receiving distance of 14~16cm, and jetting speed of 0.05~0.08mL / min.

[0017] The more optimized method for preparing the porous chitosan microspheres is as follows: (1) Mix 7~8 mg / mL of chitosan-acetic acid aqueous solution, 3~4 mg / mL of phosphorylated chitosan-acetic acid aqueous solution, 3~4 mg / mL of keratin aqueous solution, and 0.1~0.15 mg / mL of polyethylene glycol aqueous solution, stir evenly to obtain an aqueous phase; (2) Add 0.1~0.12 g / mL of Tween-20 to a mixed solvent of cyclohexane and n-hexanol to obtain an oil phase; (3) Add the aqueous phase dropwise to the oil phase and stir to form an emulsion, quickly inject 0.08~0.12 g / mL of glutaraldehyde aqueous solution, stir at 1000~1200 rpm for 6~8 hours, add anhydrous ethanol and stir for 1~2 hours, centrifuge, wash, freeze dry to obtain porous chitosan microspheres.

[0018] In a more optimized manner, the volume ratio of chitosan-acetic acid aqueous solution, phosphorylated chitosan-acetic acid aqueous solution, keratin-aqueous solution, and polyethylene glycol aqueous solution in the aqueous phase is 4~5:2:3~4:0.2~0.3; the concentration of the acetic acid aqueous solution is 1~1.2wt%; the volume ratio of cyclohexane to n-hexanol is 60~70:30~40; and the volume ratio of the aqueous phase, oil phase, and glutaraldehyde aqueous solution is 10:60:1~2.

[0019] Ideally, the concentration of the aldehyde-modified porous chitosan microsphere solution is 1-2 wt%, and the coating amount is 50-60 g / m³. 2 ;

[0020] The impregnation ratio of the composite base film to the keratinase solution is 1:5~8, and the amount of keratinase used is 120~150u / g of the composite base film.

[0021] The coating amount of the potassium 3-sulfopropyl acrylate mixed solution is 100~160 g / m². 2 .

[0022] In a more optimized manner, the preparation method of the aldehyde-modified porous chitosan microspheres is as follows: porous chitosan microspheres are added to dimethyl sulfoxide, 2-iodobenzoic acid is added, and the mixture is stirred and reacted at 25~30℃ for 30~48 hours, followed by post-treatment to obtain aldehyde-modified porous chitosan microspheres; the mass ratio of porous chitosan microspheres to 2-iodobenzoic acid is 1:0.3~0.5.

[0023] In a more optimized manner, the potassium 3-sulfopropyl acrylate mixed solution comprises the following raw materials in parts by weight: 6-8 parts potassium 3-sulfopropyl acrylate, 2-3 parts cerium complex, 0.5-1 part photoinitiator DMPA, and 100 parts deionized water.

[0024] A more optimized method for preparing the cerium-based complex is as follows: 4-allylcatechol, 3-aminomethylcatechol, and cerium salt in a molar ratio of 1:1:1 are sequentially added to xylene, stirred at 70-80°C for 1-2 hours, washed, and dried to obtain the cerium-based complex.

[0025] In a more optimized configuration, the areal density of the TPU film in the jacket fabric is 30~50 g / m². 2 .

[0026] Compared with the prior art, the advantages of this application are as follows:

[0027] (1) In this scheme, a TPU film with a double-layer structure is formed by introducing porous chitosan microspheres in different proportions into the spinning solution for spinning; and aldehyde-modified chitosan is introduced between the two layers as an interface reinforcement layer; which effectively improves the mechanical properties, air permeability and moisture permeability of the TPU film. At the same time, the thermal insulation properties of the porous chitosan microspheres are used to effectively improve the warmth retention performance of the fabric.

[0028] Among them, porous chitosan microspheres are prepared from chitosan, phosphorylated chitosan, and keratin. Compared with microspheres made from chitosan alone, they have better pore stability and mechanical properties, thereby improving the mechanical properties and air and moisture permeability of TPU films. Firstly, phosphorylated chitosan can provide additional cross-linking points to improve the mechanical strength of the microspheres and have better thermal stability, thus improving thermal insulation performance. Secondly, the introduction of phosphorylated chitosan and keratin can change the pore structure of the microspheres and increase porosity. Phosphorylation can increase the spacing between polymer chains, thereby increasing the number of air and moisture permeability channels. The addition of keratin may improve the flexibility and porosity of the microspheres, thereby enhancing their air permeability. This produces multi-crosslinked, low thermal conductivity network microspheres, which can effectively improve related properties.

[0029] In this process, porous chitosan microspheres are introduced into the spinning solution at varying concentrations to form inner and outer layers with different compositions. Subsequent enzymatic treatment roughens the keratin, creating coarse micropores that facilitate capillary action, thus enhancing moisture permeability and thermal insulation. The different content of the two layers creates a wetting gradient, improving unidirectional breathability and moisture permeability, and increasing the comfort of the jacket fabric. Furthermore, to further enhance the wetting gradient of the TPU film, thiol groups generated after keratinase treatment of the porous chitosan microspheres are grafted onto one side with potassium 3-sulfopropyl acrylate and cerium complexes, effectively increasing breathability and moisture permeability. Simultaneously, the introduced cerium complexes effectively improve far-infrared radiation and enhance warmth retention.

[0030] (2) The scheme combines TPU film with woven fabric. The outer woven fabric layer uses two-component composite fiber yarn. The fabric is soft to the touch, has a cotton feel, and is elastic, which improves the wearing experience. Detailed Implementation

[0031] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that there are no special restrictions on the purchasers of any of the raw materials involved in this invention. Exemplary examples include: in the following embodiments, "parts" refers to parts by weight; chitosan with a DAC greater than 90% was purchased from Shandong Haiyihua Biotechnology Co., Ltd.; polyethylene glycol has a molecular weight of 600; keratin has the product number HC5162 and was purchased from Tianmen Hengchang Chemical Co., Ltd.; 2-iodobenzoic acid has the CAS number 61717-82-6, 3-aminomethylcatechol has the CAS number 3-aminomethylcatechol, and 4-allylcatechol has the CAS number 1126-61-0.

[0033] Preparation of phosphorylated chitosan: 10g of chitosan was added to a 10wt% acetic acid aqueous solution and stirred at room temperature for 30 minutes. Then, 50mL of a 20wt% phosphoric acid solution was added and stirred at 50℃ for 2-3 hours. After washing and drying, phosphorylated chitosan was obtained.

[0034] Preparation of porous chitosan microspheres: (1) Mix 7 mg / mL chitosan-acetic acid aqueous solution, 3 mg / mL phosphorylated chitosan-acetic acid aqueous solution, 3 mg / mL keratin aqueous solution, and 0.12 mg / mL polyethylene glycol aqueous solution, and stir evenly to obtain an aqueous phase; (2) Add 0.1 g / mL Tween-20 to a mixed solvent of cyclohexane and n-hexanol (volume ratio 70:30) to obtain an oil phase; (3) Add the aqueous phase dropwise to the oil phase and stir to form an emulsion, then quickly inject 0.08 g / mL of... A glutaraldehyde aqueous solution was stirred at 1000 rpm for 8 hours, followed by the addition of anhydrous ethanol and stirring for 1 hour. The mixture was then centrifuged, washed, and freeze-dried to obtain porous chitosan microspheres. The volume ratio of chitosan-acetic acid aqueous solution, phosphorylated chitosan-acetic acid aqueous solution, keratin-aqueous solution, and polyethylene glycol aqueous solution was 4:2:3:0.2. The concentration of the acetic acid aqueous solution was 1 wt%. The volume ratio of Tween-20, cyclohexane, and n-hexanol in the oil phase was [not specified]. The volume ratio of the aqueous phase, oil phase, and glutaraldehyde aqueous solution was 10:60:1.5.

[0035] Preparation of aldehyde-modified porous chitosan microspheres: 1 part of porous chitosan microspheres was added to 50 parts of dimethyl sulfoxide, and 0.5 parts of 2-iodobenzoic acid were added. The mixture was stirred at 25°C for 48 hours and then post-treated to obtain aldehyde-modified porous chitosan microspheres.

[0036] Preparation of cerium-based complex: 4-allylcatechol, 3-aminomethylcatechol and cerium sulfate hydrate in a molar ratio of 1:1:1 were added sequentially to xylene, stirred at 80°C for 2 hours, washed and dried to obtain cerium-based complex.

[0037] Example 1: A method for preparing a highly waterproof and breathable rain jacket fabric, comprising the following steps:

[0038] Step 1: Preparation of TPU film: S1-1: Add 4 parts polyacrylonitrile and 6 parts hydrophilic thermoplastic polyurethane elastomer to 87 parts N,N-dimethylformamide in sequence, add 3 parts porous chitosan microspheres, and stir at 60°C for 4 hours to obtain spinning solution A; Add 4 parts polyacrylonitrile and 6 parts hydrophilic thermoplastic polyurethane elastomer to N,N-dimethylformamide in sequence, add 83 parts N,N-dimethylformamide, add 7 parts porous chitosan microspheres, and stir at 60°C for 4 hours to obtain spinning solution B;

[0039] S1-2: Electrospinning of spinning solution A at a voltage of 20kV, a receiving distance of 18cm, and a jetting speed of 0.1mL / min yields the inner layer; one side of this inner layer is coated with a 1.5wt% aldehyde-modified porous chitosan microsphere solution at a coating amount of 60g / m². 2 Using this surface as the receiving layer, the spinning solution B was electrospun on its surface at a voltage of 15kV, a receiving distance of 15cm, and a spraying speed of 0.05mL / min to obtain the outer layer; it was then dried at 65℃ for 2 hours to obtain the composite base film.

[0040] S1-3: The composite base membrane was placed in a keratinase solution (the amount of keratinase was 140 u / g of the composite base membrane by mass) at a volume ratio of 1:5 and pretreated at 45°C for 8 hours; then, a mixed solution of potassium 3-sulfopropyl acrylate was coated onto its outer surface at a coating amount of 150 g / m². 2 At room temperature, irradiate with ultraviolet light for 2 hours; soak in deionized water for 2 days, then dry to obtain TPU film;

[0041] The 3-sulfopropyl acrylate potassium salt mixed solution comprises the following raw materials by mass: 7 parts 3-sulfopropyl acrylate potassium salt, 3 parts cerium complex, 1 part photoinitiator DMPA, and 100 parts deionized water.

[0042] Step 2: Layer the TPU film with the woven fabric, set the pressure to 30Pa, and heat-press the composite at 130℃ for 10 seconds to obtain the jacket fabric.

[0043] Example 2: A method for preparing a highly waterproof and breathable rain jacket fabric, comprising the following steps:

[0044] Step 1: Preparation of TPU film: S1-1: Add 5 parts polyacrylonitrile and 7 parts hydrophilic thermoplastic polyurethane elastomer to 84 parts N,N-dimethylformamide in sequence, add 4 parts porous chitosan microspheres, and stir at 60°C for 4 hours to obtain spinning solution A; Add 5 parts polyacrylonitrile and 5 parts hydrophilic thermoplastic polyurethane elastomer to N,N-dimethylformamide in sequence, add 8 parts porous chitosan microspheres to 82 parts N,N-dimethylformamide, and stir at 60°C for 4 hours to obtain spinning solution B;

[0045] S1-2: Electrospinning of spinning solution A at a voltage of 20kV, a receiving distance of 18cm, and a jetting speed of 0.1mL / min yields the inner layer; a 2wt% aldehyde-modified porous chitosan microsphere solution is coated on one side of this inner layer at a coating amount of 50g / m². 2 Using this surface as the receiving layer, the spinning solution B was electrospun on its surface at a voltage of 15kV, a receiving distance of 15cm, and a spraying speed of 0.05mL / min to obtain the outer layer; it was then dried at 65℃ for 2 hours to obtain the composite base film.

[0046] S1-3: The composite base membrane was placed in a keratinase solution (the amount of keratinase was 140 u / g of the composite base membrane by mass) at a volume ratio of 1:5 and pretreated at 45°C for 8 hours; then, a mixed solution of potassium 3-sulfopropyl acrylate was coated onto its outer surface at a coating amount of 150 g / m². 2 At room temperature, irradiate with ultraviolet light for 2 hours; soak in deionized water for 2 days, then dry to obtain TPU film;

[0047] The 3-sulfopropyl acrylate potassium salt mixed solution comprises the following raw materials by mass: 6 parts 3-sulfopropyl acrylate potassium salt, 2 parts cerium complex, 0.5 parts photoinitiator DMPA, and 100 parts deionized water.

[0048] Step 2: Layer the TPU film with the woven fabric, set the pressure to 30Pa, and heat-press the composite at 130℃ for 10 seconds to obtain the jacket fabric.

[0049] Example 3: A method for preparing a highly waterproof and breathable rain jacket fabric, comprising the following steps:

[0050] Step 1: Preparation of TPU film: S1-1: Add 5 parts polyacrylonitrile and 5 parts hydrophilic thermoplastic polyurethane elastomer to 87 parts N,N-dimethylformamide in sequence, add 3 parts porous chitosan microspheres, and stir at 60°C for 4 hours to obtain spinning solution A; Add 4 parts polyacrylonitrile and 6 parts hydrophilic thermoplastic polyurethane elastomer to N,N-dimethylformamide in sequence, add 84 parts N,N-dimethylformamide, add 6 parts porous chitosan microspheres, and stir at 60°C for 4 hours to obtain spinning solution B;

[0051] S1-2: Electrospinning solution A was performed at a voltage of 20kV, a receiving distance of 18cm, and a jetting speed of 0.1mL / min to obtain the inner layer; a 1wt% aldehyde-modified porous chitosan microsphere solution was coated on one side of the inner layer at a coating amount of 60g / m². 2Using this surface as the receiving layer, the spinning solution B was electrospun on its surface at a voltage of 15kV, a receiving distance of 15cm, and a spraying speed of 0.05mL / min to obtain the outer layer; it was then dried at 65℃ for 2 hours to obtain the composite base film.

[0052] S1-3: The composite base membrane was placed in a keratinase solution (the amount of keratinase was 140 u / g of the composite base membrane by mass) at a volume ratio of 1:5 and pretreated at 45°C for 8 hours; then, a mixed solution of potassium 3-sulfopropyl acrylate was coated onto its outer surface at a coating amount of 150 g / m². 2 At room temperature, irradiate with ultraviolet light for 2 hours; soak in deionized water for 2 days, then dry to obtain TPU film;

[0053] The 3-sulfopropyl acrylate potassium salt mixed solution comprises the following raw materials by mass: 8 parts 3-sulfopropyl acrylate potassium salt, 2 parts cerium complex, 1 part photoinitiator DMPA, and 100 parts deionized water.

[0054] Step 2: Layer the TPU film with the woven fabric, set the pressure to 30Pa, and heat-press the composite at 130℃ for 10 seconds to obtain the jacket fabric.

[0055] Comparative Example 1: A single-layer TPU film, otherwise the same as in Example 1, specifically including the following steps:

[0056] Step 1: Preparation of TPU film: S1-1: Add 4 parts of polyacrylonitrile and 6 parts of hydrophilic thermoplastic polyurethane elastomer to 85 parts of N,N-dimethylformamide in sequence, add 5 parts of porous chitosan microspheres, stir at 60°C for 4 hours to obtain spinning solution.

[0057] S1-2: The spinning solution was electrospun at a voltage of 20kV, a receiving distance of 18cm, and a jetting speed of 0.1mL / min. The solution was then dried at 65℃ for 2 hours to obtain a composite base film.

[0058] S1-3: The composite base membrane was placed in a keratinase solution (the amount of keratinase was 140 u / g of the composite base membrane by mass) at a volume ratio of 1:5 and pretreated at 45°C for 8 hours; then, a mixed solution of potassium 3-sulfopropyl acrylate was coated onto its outer surface at a coating amount of 150 g / m². 2 At room temperature, irradiate with ultraviolet light for 2 hours; soak in deionized water for 2 days, then dry to obtain TPU film;

[0059] The 3-sulfopropyl acrylate potassium salt mixed solution comprises the following raw materials by mass: 7 parts 3-sulfopropyl acrylate potassium salt, 3 parts cerium complex, 1 part photoinitiator DMPA, and 100 parts deionized water.

[0060] Step 2: Layer the TPU film with the woven fabric, set the pressure to 30Pa, and heat-press the composite at 130℃ for 10 seconds to obtain the jacket fabric.

[0061] Comparative Example 2: Using a single chitosan porous microsphere, the rest was the same as in Example 1, except that the steps were different:

[0062] Preparation of porous chitosan microspheres: (1) Mix 10 mg / mL chitosan-acetic acid aqueous solution and 0.15 mg / mL polyethylene glycol aqueous solution, stir evenly to obtain an aqueous phase; (2) Add 0.1 g / mL Tween-20 to a mixed solvent of cyclohexane and n-hexanol (volume ratio of 70:30) to obtain an oil phase; (3) Add the aqueous phase dropwise to the oil phase and stir to form an emulsion, quickly inject 0.08 g / mL glutaraldehyde aqueous solution, stir at 1000 rpm for 8 hours, add anhydrous ethanol and stir for 1 hour, centrifuge, wash, freeze dry to obtain porous chitosan microspheres; wherein, the volume ratio of chitosan-acetic acid aqueous solution and polyethylene glycol aqueous solution is 4:0.1; the concentration of acetic acid aqueous solution is 1 wt%; the volume ratio of Tween-20, cyclohexane and n-hexanol included in the raw materials of the oil phase is; the volume ratio of aqueous phase, oil phase and glutaraldehyde aqueous solution is 10:60:1.5.

[0063] Comparative Example 3: The TPU film does not incorporate aldehyde-modified chitosan porous microspheres; the rest is the same as in Example 1, specifically including the following steps:

[0064] Step 1: Preparation of TPU film: S1-1: Add 4 parts polyacrylonitrile and 6 parts hydrophilic thermoplastic polyurethane elastomer to 87 parts N,N-dimethylformamide in sequence, add 3 parts porous chitosan microspheres, and stir at 60°C for 4 hours to obtain spinning solution A; Add 4 parts polyacrylonitrile and 6 parts hydrophilic thermoplastic polyurethane elastomer to N,N-dimethylformamide in sequence, add 83 parts N,N-dimethylformamide, add 7 parts porous chitosan microspheres, and stir at 60°C for 4 hours to obtain spinning solution B;

[0065] S1-2: Electrospinning solution A at a voltage of 20kV, a receiving distance of 18cm, and a jetting speed of 0.1mL / min yields an inner layer; using this as a receiving layer, electrospinning solution B at a voltage of 15kV, a receiving distance of 15cm, and a jetting speed of 0.05mL / min yields an outer layer; drying this outer layer at 65℃ for 2 hours yields a composite base film.

[0066] S1-3: The composite base membrane was placed in a keratinase solution (the amount of keratinase was 140 u / g of the composite base membrane by mass) at a volume ratio of 1:5 and pretreated at 45°C for 8 hours; then, a mixed solution of potassium 3-sulfopropyl acrylate was coated onto its outer surface at a coating amount of 150 g / m². 2 At room temperature, irradiate with ultraviolet light for 2 hours; soak in deionized water for 2 days, then dry to obtain TPU film;

[0067] The 3-sulfopropyl acrylate potassium salt mixed solution comprises the following raw materials by mass: 7 parts 3-sulfopropyl acrylate potassium salt, 3 parts cerium complex, 1 part photoinitiator DMPA, and 100 parts deionized water.

[0068] Step 2: Layer the TPU film with the woven fabric, set the pressure to 30Pa, and heat-press the composite at 130℃ for 10 seconds to obtain the jacket fabric.

[0069] Comparative Example 4: A composite base film was used as the TPU film, and the preparation steps were the same as in Example 1.

[0070] Comparative Example 5: Outdoor jacket fabric purchased from the market, Shenzhen Jinhongsheng Textile Technology Co., Ltd., B42012.

[0071] Performance Test 1: The following tests were conducted on the jacket fabrics used in the examples and comparative examples; hydrostatic pressure was tested according to GB / T4744-2013, with a test area of ​​100cm². 2 The water pressure rise rate was 60 cmH2O / min, and the test surface was the woven fabric side; water repellency was tested according to GB / T4745-2012 spray method, the test water temperature was 20℃, and the test surface was the woven fabric side; moisture permeability was tested according to GB / T12704.2-2009 method B, condition a, inverted cup method, the test chamber temperature was 38℃, the humidity was 50%, the wind speed was 0.3~0.5m / s, the reverse side faced the water, and the test surface was the TPU film side; the obtained data are shown in Table 1:

[0072] Table 1

[0073]

[0074] Conclusion: As can be seen from the data in the table above, the waterproof fabric prepared in this application has excellent functionality, and its hydrostatic pressure, water repellency and moisture permeability are far superior to those of commercially available waterproof fabrics.

[0075] Performance Test 1: The TPU films in the examples and comparative examples were subjected to the following performance tests: the tensile strength was tested using a universal mechanical testing instrument at a stretching rate of 100 m / min; the thermal conductivity was tested using a 2 mm thick TPU film with the same thickness for the outer and inner layers; the obtained data are shown in Table 2.

[0076] Table 2

[0077]

[0078] Conclusion: As shown in the table above, this application has prepared a TPU film with excellent mechanical and thermal insulation properties, which has excellent practicality for use in outdoor jacket fabrics.

[0079] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a waterproof and high moisture permeable shell fabric, characterized in that: Includes the following steps: Step 1: Preparation of TPU film: S1-1: Polyacrylonitrile and hydrophilic thermoplastic polyurethane elastomer are added sequentially to N,N-dimethylformamide, and porous chitosan microspheres of different proportions are added. The mixture is stirred at 55~60℃ for 4~5 hours to obtain spinning solution A and spinning solution B. S1-2: Spinning solution A to obtain an inner layer; coating one side of it with aldehyde-modified porous chitosan microsphere solution, using the coated surface as a receiving layer, spinning solution B on its surface to obtain an outer layer; drying it at 60~70℃ for 2~4 hours to obtain a composite base film; S1-3: Place the composite base film in a keratinase solution and pretreat it at 40-45℃ for 6-8 hours; then coat the outer surface of the film with a mixture of potassium 3-sulfopropyl acrylate and irradiate it with ultraviolet light at room temperature for 1-2 hours; immerse it in deionized water for 1-2 days and dry it to obtain a TPU film. Step 2: Heat-press the TPU film with the woven fabric to obtain the jacket fabric; The method for preparing the porous chitosan microspheres is as follows: (1) Mix 7~8 mg / mL of chitosan-acetic acid aqueous solution, 3~4 mg / mL of phosphorylated chitosan-acetic acid aqueous solution, 3~4 mg / mL of keratin aqueous solution, and 0.1~0.15 mg / mL of polyethylene glycol aqueous solution, stir evenly to obtain an aqueous phase; (2) Add 0.1~0.12 g / mL of Tween-20 to a mixed solvent of cyclohexane and n-hexanol to obtain an oil phase; (3) Add the aqueous phase dropwise to the oil phase and stir to form an emulsion, quickly inject 0.08~0.12 g / mL of glutaraldehyde aqueous solution, stir at 1000~1200 rpm for 6~8 hours, add anhydrous ethanol and stir for 1~2 hours, centrifuge, wash, freeze dry to obtain porous chitosan microspheres.

2. The preparation method of the strong waterproof and high moisture permeable jacket fabric according to claim 1, characterized in that: The spinning solution A comprises the following raw materials in parts by weight: 4-5 parts polyacrylonitrile, 6-7 parts hydrophilic thermoplastic polyurethane elastomer, 3-4 parts porous chitosan microspheres, and 84-87 parts N,N-dimethylformamide; the spinning solution B comprises the following raw materials in parts by weight: 4-5 parts polyacrylonitrile, 6-7 parts hydrophilic thermoplastic polyurethane elastomer, 6-8 parts porous chitosan microspheres, and 80-84 parts N,N-dimethylformamide.

3. The method for preparing a highly waterproof and breathable rain jacket fabric according to claim 1, characterized in that: The spinning parameters of the spinning solution A are: voltage of 18~20kV, receiving distance of 18~20cm, and spraying speed of 0.1~0.11mL / min; the spinning parameters of the spinning solution B are: voltage of 14~16kV, receiving distance of 14~16cm, and spraying speed of 0.05~0.08mL / min.

4. The method for preparing a highly waterproof and breathable rain jacket fabric according to claim 1, characterized in that: In the aqueous phase raw materials, the volume ratio of chitosan-acetic acid aqueous solution, phosphorylated chitosan-acetic acid aqueous solution, keratin-aqueous solution, and polyethylene glycol aqueous solution is 4~5:2:3~4:0.2~0.3; the concentration of the acetic acid aqueous solution is 1~1.2wt%; the volume ratio of cyclohexane and n-hexanol is 60~70:30~40; and the volume ratio of the aqueous phase, oil phase, and glutaraldehyde aqueous solution is 10:60:1~2.

5. The method for preparing a highly waterproof and breathable rain jacket fabric according to claim 1, characterized in that: The concentration of the aldehyde group modified porous chitosan microsphere solution is 1-2 wt%, and the coating amount is 50-60 g / m 2 ; The impregnation ratio of the composite base film to the keratinase solution is 1:5~8, and the amount of keratinase used is 120~150u / g of the composite base film. The coating amount of the 3-sulfopropyl acrylate potassium salt mixed solution is 100 to 160 g / m 2 .

6. The method for preparing a highly waterproof and breathable rain jacket fabric according to claim 1, characterized in that: The method for preparing the aldehyde-modified porous chitosan microspheres is as follows: porous chitosan microspheres are added to dimethyl sulfoxide, 2-iodobenzoic acid is added, and the mixture is stirred and reacted at 25~30℃ for 30~48 hours. After post-treatment, aldehyde-modified porous chitosan microspheres are obtained. The mass ratio of porous chitosan microspheres to 2-iodobenzoic acid is 1:0.3~0.

5.

7. The method for preparing a highly waterproof and breathable rain jacket fabric according to claim 1, characterized in that: The 3-sulfopropyl acrylate potassium salt mixed solution comprises the following raw materials in parts by weight: 6-8 parts of 3-sulfopropyl acrylate potassium salt, 2-3 parts of cerium complex, 0.5-1 parts of photoinitiator DMPA, and 100 parts of deionized water.

8. The preparation method of the strong waterproof and high moisture permeable jacket fabric according to claim 7, characterized in that: The cerium-based complex is prepared by sequentially adding 4-allylcatechol, 3-aminomethylcatechol, and cerium salt in a molar ratio of 1:1:1 to xylene, stirring at 70-80°C for 1-2 hours, washing, and drying to obtain the cerium-based complex.

9. The waterproof and breathable jacket fabric prepared by the method according to any one of claims 1-8, characterized in that: The TPU film has a areal density of 30-50 g / m 2 .

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