Processing technology of a military waterproof and warm coat fabric

Abstract

The present invention discloses a processing technology for a fabric of a military waterproof and warm coat. First, the fabric base cloth is modified in the present invention to improve the surface activity of the fabric base cloth, which is beneficial to the subsequent reactions. In the present invention, polydopamine and ammonium phosphate are intercalated into the montmorillonite layers to obtain composite nanosheets. The combined action of polydopamine and ammonium phosphate improves the flame retardant performance of montmorillonite. Then, nano-silica aerogel is loaded on the montmorillonite to obtain composite modified montmorillonite, so that the composite modified montmorillonite has good heat preservation performance. The epoxy groups in the pretreated fabric react with the composite modified montmorillonite to improve the bonding firmness between the composite modified montmorillonite and the fabric. After multiple water washings, the fabric still has good heat preservation performance and flame retardant performance. Then, sodium methyl silicate is used to treat the preliminarily modified fabric to improve the waterproof performance of the fabric.

Description

Technical Field

[0001] The present invention relates to the technical field of fabric processing, and particularly relates to a processing technology for a fabric of a military waterproof and warm coat. Background Art

[0002] Military clothing fabrics are a type of materials specifically used for making military clothing. Such fabrics have many special properties and can meet the needs of soldiers in various harsh environments. For example, in forests that are dark, humid and have many mosquitoes, deserts with large day-night temperature differences and strong light, or burning areas where bullets fly, so higher requirements are put forward for the fabrics of military uniforms: having good moisture absorption and sweat discharge performance to ensure comfortable wearing; having good anti-mosquito, anti-mildew, antibacterial and anti-scratch properties to meet the use in dark and humid environments such as forests; having excellent ultraviolet resistance and cold protection functions to be suitable for harsh environments such as deserts or polar regions; having excellent flame retardant performance to ensure being able to shuttle through burning areas.

[0003] There are many types of military clothing fabrics. According to different functions and uses, they can be divided into various types. For example, military uniform fabrics are divided into two types: fabrics for military camps and fabrics for field use. Fabrics for military camps usually choose cotton textiles, such as cotton cloth, cotton silk, etc. Such fabrics have a soft texture, high comfort, good air permeability and are comfortable to wear, but the disadvantages are that the moisture absorption and warmth retention are not strong. Fabrics for field use are mainly synthetic fibers, such as nylon, polyester fiber, etc. Such fabrics are mainly used to make military clothing with waterproof, windproof and warm-keeping properties, and have the characteristics of being light, durable, waterproof and breathable, and ultraviolet resistant, and can withstand harsh climate conditions.

[0004] Chinese patent document CN201710614019.9 discloses a military fabric with infrared prevention, high wear resistance and high toughness. Its raw materials by weight include: 30-40 parts of modified polylactic acid fiber, 15-25 parts of modified polyester fiber, 6-12 parts of polypropylene filament, 10-20 parts of polyester fiber, 3-5 parts of wool fiber, 4-8 parts of corn fiber, 2-5 parts of nylon fiber, 1-5 parts of jute fiber, 3-5 parts of asbestos fiber, 1-5 parts of polyamide fiber, 2-5 parts of polyethylene glycol, 4-6 parts of methacrylic acid, 3-5 parts of ethyl acetate, 4-8 parts of propylene glycol. The prepared military fabric has the performance of preventing infrared rays, and has excellent wear resistance and toughness, but the flame retardant performance and waterproof performance still need to be improved.

[0005] When the fabric is subjected to multi-functional finishing, due to the mutual influence between various finishing agents and auxiliaries, the finishing process also has a certain influence on the product performance. Therefore, studying the compatibility between various finishing agents and auxiliaries, and at the same time solving the coordination problems between various properties such as flame retardant performance, warmth retention performance and waterproof performance during finishing is of great significance for preparing multi-functional military fabrics. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a processing technology for a military waterproof and warm overcoat fabric, and the prepared military warm overcoat fabric has good flame retardancy, warmth retention performance and waterproof performance.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A processing technology for a military waterproof and warm overcoat fabric includes the following steps:

[0009] S1. Immerse the fabric base cloth in an epoxy group silane coupling agent solution, then take it out and dry it to obtain a pretreated fabric;

[0010] S2. Immerse the pretreated fabric in a finishing solution for padding, then take out the padded fabric and dry it to obtain a preliminarily modified fabric;

[0011] S3. Immerse the preliminarily modified fabric in an aqueous solution of sodium methyl silicate for padding, then take out the padded fabric, first air-dry it at room temperature, and then dry it in a drying oven to obtain the military waterproof and warm overcoat fabric;

[0012] The preparation method of the finishing solution is as follows:

[0013] (1) Add montmorillonite to deionized water, disperse it evenly, then add polydopamine and ammonium phosphate salt to it, stir at 40 - 60 °C for 6 - 12 h, filter, wash, and dry to obtain pretreated montmorillonite;

[0014] (2) Mix tetraethyl orthosilicate, deionized water and ethanol evenly, adjust the pH of the solution to 2 - 3, stir and hydrolyze for 1 - 2 h, then adjust the pH of the solution to 8 - 9, stir at room temperature for 3 - 4 h, then add the pretreated montmorillonite, stir for 4 - 6 h, then put it into a dialysis bag for dialysis, and freeze-dry to obtain composite modified montmorillonite;

[0015] (3) Add the composite modified montmorillonite and polyurethane adhesive to deionized water, disperse it evenly to obtain the finishing solution.

[0016] Preferably, in step S1, the mass fraction of the epoxy group silane coupling agent solution is 1 - 3%.

[0017] Preferably, in step S1, the epoxy group silane coupling agent is selected from one or more of γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltripropoxysilane, 3,4-epoxycyclohexylmethyltrimethoxysilane.

[0018] Preferably, in step S1, the bath ratio is 1:10 - 20, and the soaking time is 2 - 3 h.

[0019] Preferably, in step S2, the liquor ratio is 1:20 - 40, and the padding time is 60 - 90 min.

[0020] Preferably, in step (1), the mass ratio of montmorillonite, polydopamine and ammonium phosphate is 10 - 20:5 - 8:3 - 6.

[0021] Preferably, in step (2), the mass ratio of tetraethyl orthosilicate, deionized water, ethanol and pretreated montmorillonite is 2 - 3:15 - 25:80 - 100:5 - 10.

[0022] Preferably, in step (3), the concentration of the composite modified montmorillonite is 10 - 15 g / L, and the concentration of the polyurethane adhesive is 3 - 6 g / L.

[0023] Preferably, in step S3, the mass fraction of the sodium methyl silicate aqueous solution is 2 - 4%.

[0024] Preferably, in step S3, the liquor ratio is 1:20 - 30, and the padding time is 30 - 60 min.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The present invention uses an epoxy group - containing silane coupling agent to modify the fabric base fabric, introducing epoxy groups on the surface of the fabric base fabric, improving the surface activity of the fabric base fabric, and facilitating the subsequent reaction; the present invention intercalates polydopamine and ammonium phosphate into the montmorillonite lamellae to obtain composite nanosheets. Polydopamine can generate non - flammable gases, and ammonium phosphate serves as a foaming source. The combined action of polydopamine and ammonium phosphate improves the flame - retardant performance of montmorillonite; then nano - silica aerogel is loaded on the montmorillonite to obtain composite modified montmorillonite, making the composite modified montmorillonite have good heat - preservation performance. The epoxy groups in the pretreated fabric react with the composite modified montmorillonite, improving the bonding firmness between the composite modified montmorillonite and the fabric. After multiple washes, the fabric still has good heat - preservation performance and flame - retardant performance; then the preliminary modified fabric is treated with sodium methyl silicate. Sodium methyl silicate decomposes in the air to form methyl silicic acid, and methyl silicic acid forms a polysiloxane film covering the surface of the preliminary modified fabric, thereby improving the waterproof performance of the fabric.

[0027] (2) The inventor found during the experiment that if the pretreated fabric is first subjected to waterproof treatment with a sodium methyl silicate aqueous solution and then treated with a finishing solution, the flame - retardant performance and heat - preservation performance of the prepared fabric become poor. The reason may be that the composite modified montmorillonite is not easily loaded on the polysiloxane film formed by methyl silicic acid, thereby resulting in poor flame - retardant performance and heat - preservation performance of the fabric. Detailed implementation mode

[0028] The present invention will be further described in detail below through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0029] It should be noted that unless otherwise specified, the chemical reagents involved in the present invention are all purchased through commercial channels.

[0030] The fabric base cloth used in the present invention is polyester Oxford cloth, with a yarn count of 600D*600D and a gram weight of 230 g / m 2 ;

[0031] Montmorillonite was purchased from Zhejiang Huate New Materials Co., Ltd., CAS No.: 1302-78-9;

[0032] The ammonium phosphate salt is ammonium dihydrogen phosphate;

[0033] Polydopamine was purchased from Hangzhou Xinqiao Biotechnology Co., Ltd.;

[0034] The polyurethane adhesive was purchased from Shanghai Liulian New Materials Technology Co., Ltd., grade: LP-951.

[0035] Example 1

[0036] A processing technology for a military waterproof and warm coat fabric includes the following steps:

[0037] S1. Immerse the fabric base cloth in a 1% (mass fraction) γ-glycidoxypropyltrimethoxysilane solution, with a bath ratio of 1:10 (mass ratio), soak for 2 h, then take it out and dry at 60 °C to obtain a pretreated fabric;

[0038] S2. Immerse the pretreated fabric in the finishing solution and pad-roll for 60 min, with a bath ratio of 1:20 (mass ratio), then take out the pad-rolled fabric and dry at 120 °C to obtain a preliminarily modified fabric; the preparation method of the finishing solution is as follows:

[0039] (1) Add 10 g of montmorillonite to deionized water, disperse evenly, then add 5 g of polydopamine and 3 g of ammonium dihydrogen phosphate thereto, stir at 40 °C for 12 h, filter, wash, and dry to obtain pretreated montmorillonite;

[0040] (2) Mix 2 g of tetraethyl orthosilicate, 15 g of deionized water, and 80 g of ethanol evenly, adjust the pH of the solution to 2, stir and hydrolyze for 1 h, then adjust the pH of the solution to 8, stir at room temperature for 3 h, then add 5 g of pretreated montmorillonite, stir for 4 h, then put it into a dialysis bag and dialyze for 36 h, and then freeze-dry to obtain composite modified montmorillonite;

[0041] (3) Add the compound modified montmorillonite and polyurethane adhesive into deionized water and disperse them evenly. The concentration of the compound modified montmorillonite is 10 g / L, and the concentration of the polyurethane adhesive is 3 g / L, thus obtaining the finishing liquid.

[0042] S3. Immerse the preliminarily modified fabric into a 2 wt% aqueous solution of sodium methyl silicate and pad it for 30 min with a liquor ratio of 1:20 (mass ratio). Then take out the padded fabric, first air-dry it at room temperature, and then dry it in an oven at 60 °C to obtain the fabric for military waterproof and warm overcoats.

[0043] Example 2

[0044] A processing technology for the fabric of military waterproof and warm overcoats, comprising the following steps:

[0045] S1. Immerse the fabric base in a 2% by mass solution of γ-glycidoxypropyltrimethoxysilane with a liquor ratio of 1:15 (mass ratio) for 3 h. Then take it out and dry it at 60 °C to obtain the pretreated fabric.

[0046] S2. Immerse the pretreated fabric into the finishing liquid and pad it for 90 min with a liquor ratio of 1:30 (mass ratio). Then take out the padded fabric and dry it at 120 °C to obtain the preliminarily modified fabric. The preparation method of the finishing liquid is as follows:

[0047] (1) Add 20 g of montmorillonite into deionized water and disperse it evenly. Then add 8 g of polydopamine and 6 g of ammonium dihydrogen phosphate into it, stir at 60 °C for 6 h, filter, wash, and dry to obtain the pretreated montmorillonite.

[0048] (2) Mix 3 g of tetraethyl orthosilicate, 25 g of deionized water, and 100 g of ethanol evenly, adjust the pH of the solution to 2, stir and hydrolyze for 2 h. Then adjust the pH of the solution to 9, stir at room temperature for 4 h. Then add 10 g of the pretreated montmorillonite, stir for 6 h, then put it into a dialysis bag and dialyze for 36 h, and then freeze-dry to obtain the compound modified montmorillonite.

[0049] (3) Add the compound modified montmorillonite and polyurethane adhesive into deionized water and disperse them evenly. The concentration of the compound modified montmorillonite is 15 g / L, and the concentration of the polyurethane adhesive is 4 g / L, thus obtaining the finishing liquid.

[0050] S3. Immerse the preliminarily modified fabric into a 4 wt% aqueous solution of sodium methyl silicate and pad it for 30 min with a liquor ratio of 1:25 (mass ratio). Then take out the padded fabric, first air-dry it at room temperature, and then dry it in an oven at 60 °C to obtain the fabric for military waterproof and warm overcoats.

[0051] Example 3

[0052] A processing technology for the fabric of a military waterproof and warm overcoat, comprising the following steps:

[0053] S1. Immerse the fabric base cloth in a 3,4-epoxycyclohexylmethyltrimethoxysilane solution with a mass fraction of 3%, with a bath ratio of 1:20 (mass ratio), soak for 2 h, then take it out and dry at 60 °C to obtain a pretreated fabric;

[0054] S2. Immerse the pretreated fabric in the finishing solution and pad-roll for 80 min, with a bath ratio of 1:40 (mass ratio), then take out the pad-rolled fabric and dry at 120 °C to obtain a preliminarily modified fabric; the preparation method of the finishing solution is as follows:

[0055] (1) Add 15 g of montmorillonite to deionized water, disperse evenly, then add 6 g of polydopamine and 5 g of ammonium dihydrogen phosphate, stir at 50 °C for 10 h, filter, wash, and dry to obtain pretreated montmorillonite;

[0056] (2) Mix 3 g of tetraethyl orthosilicate, 20 g of deionized water, and 100 g of ethanol evenly, adjust the pH of the solution to 3, stir and hydrolyze for 1 h, then adjust the pH of the solution to 9, stir at room temperature for 3 h, then add 6 g of pretreated montmorillonite, stir for 5 h, then put it into a dialysis bag and dialyze for 36 h, and then freeze-dry to obtain composite modified montmorillonite;

[0057] (3) Add the composite modified montmorillonite and polyurethane adhesive to deionized water, disperse evenly, where the concentration of the composite modified montmorillonite is 12 g / L and the concentration of the polyurethane adhesive is 6 g / L, then the finishing solution is obtained;

[0058] S3. Immerse the preliminarily modified fabric in a 3 wt% aqueous solution of sodium methyl silicate and pad-roll for 30 min, with a bath ratio of 1:30 (mass ratio), then take out the pad-rolled fabric, first air-dry at room temperature, and then dry in an oven at 60 °C to obtain the fabric of the military waterproof and warm overcoat.

[0059] Comparative Example 1

[0060] A processing technology for the fabric of a military waterproof and warm overcoat, comprising the following steps:

[0061] S1. Immerse the fabric base cloth in the finishing solution and pad-roll for 80 min, with a bath ratio of 1:40 (mass ratio), then take out the pad-rolled fabric and dry at 120 °C to obtain a preliminarily modified fabric; the preparation method of the finishing solution is as follows:

[0062] (1) Add 15 g of montmorillonite to deionized water, disperse evenly, then add 6 g of polydopamine and 5 g of ammonium dihydrogen phosphate thereto, stir at 50 °C for 10 h, filter, wash, and dry to obtain pretreated montmorillonite;

[0063] (2) Mix 3 g of tetraethyl orthosilicate, 20 g of deionized water, and 100 g of ethanol evenly, adjust the pH of the solution to 3, stir and hydrolyze for 1 h, then adjust the pH of the solution to 9, stir at room temperature for 3 h, then add 6 g of pretreated montmorillonite, stir for 5 h, then put it into a dialysis bag and dialyze for 36 h, and then freeze-dry to obtain compound-modified montmorillonite;

[0064] (3) Add the compound-modified montmorillonite and polyurethane adhesive to deionized water, disperse evenly, where the concentration of the compound-modified montmorillonite is 12 g / L and the concentration of the polyurethane adhesive is 6 g / L to obtain the finishing solution;

[0065] S2. Immerse the preliminarily modified fabric in an aqueous solution of 3 wt% sodium methyl silicate and pad for 30 min, with a liquor ratio of 1:30 (mass ratio). Then take out the padded fabric, first air-dry at room temperature, and then dry in an oven at 60 °C to obtain the fabric for military waterproof and warm coats.

[0066] Comparative Example 2

[0067] A processing technology for the fabric of military waterproof and warm coats, comprising the following steps:

[0068] S1. Immerse the fabric base in a 3% (mass fraction) solution of 3,4-epoxycyclohexylmethyltrimethoxysilane, with a liquor ratio of 1:20 (mass ratio), soak for 2 h, then take out and dry at 60 °C to obtain the pretreated fabric;

[0069] S2. Immerse the pretreated fabric in the finishing solution and pad for 80 min, with a liquor ratio of 1:40 (mass ratio). Then take out the padded fabric and dry at 120 °C to obtain the preliminarily modified fabric. The preparation method of the finishing solution is as follows:

[0070] (1) Add 15 g of montmorillonite to deionized water, disperse evenly, then add 6 g of polydopamine and 5 g of ammonium dihydrogen phosphate thereto, stir at 50 °C for 10 h, filter, wash, and dry to obtain modified montmorillonite;

[0071] (2) Add the modified montmorillonite and polyurethane adhesive to deionized water, disperse evenly, where the concentration of the compound-modified montmorillonite is 12 g / L and the concentration of the polyurethane adhesive is 6 g / L to obtain the finishing solution;

[0072] S3. Immerse the preliminarily modified fabric in an aqueous solution of sodium methyl silicate with a concentration of 3 wt% for padding for 30 min, with a liquor ratio of 1:30 (mass ratio). Then take out the padded fabric, first air-dry it at room temperature, and then dry it in an oven at 60 °C to obtain the fabric for military waterproof and warm coats.

[0073] Comparative Example 3

[0074] A processing technology for the fabric of military waterproof and warm coats includes the following steps:

[0075] S1. Immerse the fabric base cloth in a 3,4-epoxycyclohexylmethyltrimethoxysilane solution with a mass fraction of 3%, with a liquor ratio of 1:20 (mass ratio), for an immersion time of 2 h. Then take it out and dry it at 60 °C to obtain the pretreated fabric.

[0076] S2. Immerse the pretreated fabric in an aqueous solution of sodium methyl silicate with a concentration of 3 wt% for padding for 30 min, with a liquor ratio of 1:30 (mass ratio). Then take out the padded fabric, first air-dry it at room temperature, and then dry it in an oven at 60 °C to obtain the preliminarily modified fabric.

[0077] S3. Immerse the preliminarily modified fabric in the finishing solution for padding for 80 min, with a liquor ratio of 1:40 (mass ratio). Then take out the padded fabric and dry it at 120 °C to obtain the fabric for military waterproof and warm coats. The preparation method of the finishing solution is as follows:

[0078] (1) Add 15 g of montmorillonite to deionized water, disperse it evenly, then add 6 g of polydopamine and 5 g of ammonium dihydrogen phosphate to it, stir at 50 °C for 10 h, and after filtration, washing, and drying, obtain the pretreated montmorillonite.

[0079] (2) Mix 3 g of tetraethyl orthosilicate, 20 g of deionized water, and 100 g of ethanol evenly, adjust the pH of the solution to 3, stir and hydrolyze for 1 h, then adjust the pH of the solution to 9, stir at room temperature for 3 h, then add 6 g of the pretreated montmorillonite, stir for 5 h, then put it into a dialysis bag and dialyze for 36 h, and then freeze-dry to obtain the composite modified montmorillonite.

[0080] (3) Add the composite modified montmorillonite and polyurethane adhesive to deionized water, disperse it evenly, where the concentration of the composite modified montmorillonite is 12 g / L and the concentration of the polyurethane adhesive is 6 g / L to obtain the finishing solution.

[0081] Perform performance tests on the fabrics prepared in Examples 1 - 3 and Comparative Examples 1 - 3 as follows:

[0082] Limiting oxygen index test: Conduct the test according to the standard of GB / T 5454 - 1997 "Textiles - Burning performance - Oxygen index method".

[0083] Thermal insulation performance test: According to the standard of GB / T 11048-2018 "Determination of Thermal Resistance and Moisture Resistance of Textiles under Steady-State Conditions of Physiological Comfort", a thermal resistance and moisture resistance tester is used to conduct the thermal resistance test. The specific method is as follows: Cover the test sample on the test plate, and the thermal guard rings around and at the bottom of the test plate can maintain a constant temperature, so that the heat of the test plate can only be dissipated vertically upward through the test sample. The thermal resistance of the test sample is calculated by collecting the air temperatures of the test plate and the test chamber. The size of the test sample is 30 cm × 30 cm;

[0084] Waterproof performance test: Test according to the standard of GB / T 4745-2012 "Testing and Evaluation of Water Resistance of Textiles - Spray Test"; The test results are shown in Table 1:

[0085] Table 1

[0086]

[0087]

[0088] The fabrics prepared in Example 3 and Comparative Example 1 are washed 30 times. The washing method is carried out according to the standard of GB / T 8629-2017 "Textiles - Home Laundering and Drying Procedures for Testing". Then, the limiting oxygen index, thermal insulation performance and waterproof performance are tested. The test results are shown in Table 2:

[0089] Table 2

[0090] LOI(%) <![CDATA[Thermal resistance value (m 2 ·K·W -1 )]]> Water absorption level (grade) Example 3 36.4 0.21 5 Comparative Example 1 25.7 0.09 3

[0091] Finally, it should be noted that the above embodiments do not limit the present invention in any form. For those skilled in the art, based on the present invention, some modifications and improvements can be made. Therefore, any modification or improvement made without departing from the spirit of the present invention falls within the scope of protection required by the present invention.

Claims

1. Processing technology of a military waterproof and warm overcoat fabric, Characterized in that, It includes the following steps: S1. Immerse the fabric base cloth in an epoxy-based silane coupling agent solution, then take it out and dry it to obtain a pretreated fabric; S2. Immerse the pretreated fabric in a finishing solution for padding, then take out the padded fabric and dry it to obtain a preliminarily modified fabric; S3. Immerse the preliminarily modified fabric in an aqueous solution of sodium methyl silicate for padding, then take out the padded fabric, first air-dry it at room temperature, and then dry it in a drying oven to obtain the military waterproof and warm overcoat fabric; The preparation method of the finishing solution is as follows: (1) Add montmorillonite to deionized water, disperse it evenly, then add polydopamine and ammonium phosphate salt to it, stir at 40-60 °C for 6-12 h, filter, wash, and dry to obtain pretreated montmorillonite; (2) Mix tetraethyl orthosilicate, deionized water and ethanol evenly, adjust the pH of the solution to 2-3, stir and hydrolyze for 1-2 h, then adjust the pH of the solution to 8-9, stir at room temperature for 3-4 h, then add pretreated montmorillonite, stir for 4-6 h, then put it into a dialysis bag for dialysis, and freeze-dry to obtain composite modified montmorillonite; (3) Add the composite modified montmorillonite and polyurethane adhesive to deionized water, disperse it evenly to obtain the finishing solution.

2. The processing technology of the military waterproof and warm overcoat fabric according to claim 1, Characterized in that, In step S1, the mass fraction of the epoxy-based silane coupling agent solution is 1-3%.

3. The processing technology of the military waterproof and warm overcoat fabric according to claim 1, Characterized in that, In step S1, the epoxy-based silane coupling agent is selected from one or more of γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltripropoxysilane, 3,4-epoxycyclohexylmethyltrimethoxysilane.

4. The processing technology of the military waterproof and warm overcoat fabric according to claim 1, Characterized in that, In step S1, the bath ratio is 1:10-20, and the soaking time is 2-3 h.

5. The processing technology of the military waterproof and warm overcoat fabric according to claim 1, Characterized in that, In step S2, the bath ratio is 1:20-40, and the padding time is 60-90 min.

6. The processing technology of the military waterproof and warm overcoat fabric according to claim 1, Characterized in that, In step (1), the mass ratio of montmorillonite, polydopamine and ammonium phosphate salt is 10-20:5-8:3-6.

7. The processing technology of the military waterproof and warm overcoat fabric according to claim 1, Characterized in that, In step (2), the mass ratio of tetraethyl orthosilicate, deionized water, ethanol and pretreated montmorillonite is 2-3:15-25:80-100:5-10.

8. The processing technology of the military waterproof and warm overcoat fabric according to claim 1, Characterized in that, In step (3), the concentration of the composite modified montmorillonite is 10-15 g / L, and the concentration of the polyurethane adhesive is 3-6 g / L.

9. The processing technology of the fabric for military waterproof and warm overcoats according to claim 1, characterized in that, in step S3, the mass fraction of the sodium methyl silicate aqueous solution is 2-4%.

10. The processing technology of the fabric for military waterproof and warm overcoats according to claim 1, characterized in that, in step S3, the bath ratio is 1:20-30, and the padding time is 30-60 min.

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