Preparation method of waterproof and cold-resistant work clothes

Abstract

The invention belongs to the technical field of textiles and garments, and particularly relates to a preparation method of waterproof and cold-resistant work clothes, which comprises the following steps: dissolving and spinning nylon 66 to form a fabric, roughening the nylon fabric, depositing a silica structure on the surface, carrying out hot press molding, adhering with a cotton fabric, and carrying out hot press to obtain a cold-resistant fabric, and cutting to obtain the waterproof and cold-resistant work clothes. The problem of wear resistance of existing cold protective clothing is solved, a wear-resistant waterproof surface is obtained by depositing a silica precursor on the surface of the nylon fabric and performing hydrolysis and hot press molding, and the waterproof stability is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of textile clothing, and in particular relates to a method for preparing waterproof and cold-resistant work clothes. Background Art

[0002] Cold-proof work clothes are a type of clothing specifically used for working in low-temperature environments. They are mainly used for protection and warmth, ensuring that workers can stay comfortable and safe in extremely low-temperature conditions. Current cold-proof work clothes are composed of an inner layer of thermal insulation material and an outer layer of cold-proof material. The inner layer of thermal insulation material is mainly chemical fiber cotton, and the outer layer of cold-proof material is mainly nylon fabric. However, nylon fabric requires thick nylon fabric to meet the cold-proof effect, which not only reduces the wear resistance of the cold-proof clothing, but also reduces flexibility. In short, the cold-proof clothing has problems with durability and flexibility. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a method for preparing waterproof and cold-resistant work clothes, which solves the problem of wear resistance of existing cold-proof clothes. Silicon oxide precursors are deposited on the surface of nylon fabrics, which are hydrolyzed and hot-pressed to obtain a wear-resistant and waterproof surface, thereby ensuring waterproof stability.

[0004] In order to achieve the above technical objectives, the technical solution of the present invention is:

[0005] A method for preparing waterproof and cold-resistant work clothes comprises the following steps:

[0006] Step 1, adding formic acid to ethanol and stirring well to form a mixed solvent, then adding refined nylon 66 and heating and ultrasonicating for 20-30 minutes, and heating to obtain a nylon solution; the volume ratio of formic acid to ethanol is 5:5-7, the stirring speed for uniform stirring is 200-500r / min, the mass ratio of nylon 66 to formic acid is 5-7:7, the temperature of the heating and ultrasonicating is 50-60°C, the ultrasonic frequency is 80-100kHz, and the heating temperature is 80-90°C; this step utilizes the mutual solubility of formic acid and ethanol to form a good mixture and obtain a homogeneous mixture liquid, and then put refined nylon 66 into the homogeneous mixed liquid, and form rapid dispersion and dissolution under the action of temperature and ultrasonic high-frequency vibration, so as to obtain a mixed solvent for dissolving nylon 66, and remove ethanol during the heating process to obtain a formic acid solution of nylon 66; wherein, the nylon 66 refining method comprises the following steps: a1, blending nylon 66 with ether, and then low-temperature grinding for 2-3h to obtain a refined material, wherein the mass ratio of nylon 66 to ether is 5:1-2, the mixing temperature is 5-10°C, the temperature of the low-temperature grinding treatment is 0-5°C, and the grinding pressure is 0.6 -0.8MPa, the low temperature grinding process is carried out in a sealed environment. This step utilizes the insolubility of nylon and ether to form a liquid phase grinding process, and utilizes a low temperature sealed environment to ensure that the ether always remains in a liquid phase. Even if a certain amount of heat is generated during the grinding process, which will cause the ether to evaporate, the ether will gradually liquidize in a low temperature sealed environment to form ether liquid; a2, the refined material is purged at a constant temperature to obtain refined nylon powder, and the purged tail gas is cooled and collected to obtain ether. The constant temperature purging uses dry nitrogen, and the temperature of the nitrogen is 60-80°C, and the purging speed is 10-30g / L The temperature of the cooling and collection is 0-5°C. In this step, the sealed and ground refined material is purged with constant temperature nitrogen. The temperature can directly convert the ether liquid into ether vapor, while the refined nylon powder is not affected. The tail gas converts the ether vapor back into ether liquid during the low-temperature collection process, so as to achieve the purpose of ether recovery and reduce air pollution. The refined nylon material basically does not contain ether. Even if there is a small amount of ether remaining, when the refined nylon powder is placed in a mixed solvent of formic acid and ethanol, the ether can directly enter the mixed solvent, and directly evaporate and collect in ethanol in the subsequent heating;

[0007] Step 2, electrospinning the nylon solution and hot pressing to obtain nylon fabric, wherein the electrospinning pressure is 20-30 kV, the receiving distance is 15-20 cm, the receiving speed is 100-150 r / min, and the infusion speed is 0.1-0.3 mm / min. This step converts the nylon solution into spinning by electrospinning, and forms nylon fabric during the hot pressing process;

[0008] Step 3, spraying formic acid onto the surface of the nylon fabric and letting it stand for 20-30 minutes, then rinsing it with ethanol, and drying it to obtain a nylon fabric with a rough surface. The spraying amount of the spray is 1-2 mL / cm 2 The static temperature is 20-30°C, the drying temperature is 70-80°C, and the spray volume of the secondary spray is 0.5-0.9 mL / cm 2 , the temperature is 0-5°C, this step uses formic acid spraying and standing to roughen the surface of the nylon fabric, and then uses the solubility of ethanol in formic acid to form a surface concave-convex structure;

[0009] Step 4, adding dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane to ether and stirring evenly, then adding formic acid to form a mixed silane liquid, and finally spraying the mixed silane liquid onto the nylon fabric to obtain a coated nylon fabric, wherein the molar ratio of the dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane is 2-3:3-5:1, the concentration of the dichlorodimethylsilane in the ether is 100-200 g / L, the stirring speed for uniform stirring is 400-800 r / min, the amount of formic acid added is 3-5% of the volume of the ether, and the spraying amount of the spray is 3-5 mL / cm 2 This step utilizes the solubility of formic acid and ether to form a mixed solvent, and utilizes the solubility of dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane in ether to form a stable dispersion to achieve a homogeneously dispersed mixed silane liquid, and finally forms a surface liquid film under the action of spraying;

[0010] Step 5, allowing the coated nylon fabric to stand for 20-30 minutes, and then hot-pressing to obtain a composite nylon fabric, wherein the atmosphere of the standing still is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10-12:1, and the temperature is 40-50°C; the temperature of the hot-pressing is 230-235°C, and the pressure is 0.3-0.5MPa. In this step, the water vapor in the standing still atmosphere is used to hydrolyze dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane, and a surface silicon-oxygen structure is formed during the hot-pressing. At the same time, the silane structure penetrates into the nylon during the hot-pressing to form a wear-resistant and waterproof effect on the surface;

[0011] Step 6, the cotton fabric is adhered to the surface of the composite nylon fabric with a polyurethane adhesive, hot-pressed to obtain a cold-resistant fabric, and then the cold-resistant fabric is cut into work clothes to obtain waterproof cold-resistant work clothes, wherein the mass of the cotton fabric is 20-50% of the composite nylon fabric, and the mass of the polyurethane adhesive is 1-2% of the composite nylon fabric.

[0012] It can be seen from the above description that the present invention has the following advantages:

[0013] 1. The present invention solves the problem of wear resistance of existing cold-proof clothing. Silicon oxide precursors are deposited on the surface of nylon fabrics, and after hydrolysis and hot pressing, a wear-resistant and waterproof surface is obtained to ensure waterproof stability.

[0014] 2. The present invention utilizes dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane as silane precursors, which form a silicon-oxygen structure after hydrolysis, and at the same time form a saturated alkyl branched structure of methyl, isopropyl, and dodecyl, thereby forming a surface hydrophobic effect, thereby utilizing the surface hydrophobicity to enhance the waterproof effect; at the same time, the branched chain improves the wear resistance of the surface of the work clothes.

[0015] 3. The present invention uses formic acid as a nylon dissolving liquid to roughen the nylon fabric, effectively improving the adhesion of the nylon surface, thereby improving the stability and adhesion of the multi-layer structure. DETAILED DESCRIPTION

[0016] The present invention is described in detail with reference to the embodiments, but no limitation is imposed on the claims of the present invention.

[0017] Example 1

[0018] A method for preparing waterproof and cold-resistant work clothes comprises the following steps:

[0019] Step 1, adding formic acid to ethanol and stirring thoroughly to form a mixed solvent, then adding refined nylon 66 and heating and ultrasonicating for 20 minutes, and heating to obtain a nylon solution; the volume ratio of formic acid to ethanol is 1:1, the stirring speed for uniform stirring is 200r / min, the mass ratio of nylon 66 to formic acid is 5:7, the temperature of the heating and ultrasonicating is 50°C, the ultrasonic frequency is 80kHz, and the heating temperature is 80°C; wherein the nylon 66 refinement method comprises the following steps: a1, Nylon 66 is blended with ether and then subjected to cryogenic grinding for 2 hours to obtain a refined material, wherein the mass ratio of nylon 66 to ether is 5:1, the mixing temperature is 5°C, the cryogenic grinding temperature is 0°C, and the grinding pressure is 0.6MPa; a2, the refined material is subjected to constant temperature purging to obtain refined nylon powder, and the purged tail gas is cooled and collected to obtain ether, wherein the constant temperature purging adopts dry nitrogen, and the temperature of the nitrogen is 60°C, the purging rate is 10g / L, and the cooling collection temperature is 0°C;

[0020] Step 2, electrospinning the nylon solution and hot pressing it to obtain nylon fabric, wherein the electrospinning pressure is 20 kV, the receiving distance is 15 cm, the receiving speed is 100 r / min, and the infusion speed is 0.1 mm / min;

[0021] Step 3: spray formic acid onto the surface of the nylon fabric and let it stand for 20 minutes, then rinse it with ethanol, and dry it to obtain a nylon fabric with a rough surface. The spray volume is 1 mL / cm 2 The static temperature is 20°C, the drying temperature is 70°C, and the spray volume of the secondary spray is 0.5 mL / cm 2 , the temperature is 0℃;

[0022] Step 4, adding dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane to ether and stirring evenly, then adding formic acid to form a mixed silane liquid, and finally spraying the mixed silane liquid onto the nylon fabric to obtain a coated nylon fabric, wherein the molar ratio of the dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane is 2:3:1, the concentration of the dichlorodimethylsilane in the ether is 100 g / L, the stirring speed for uniform stirring is 400 r / min, the amount of formic acid added is 3% of the volume of the ether, and the spraying amount of the spray is 3 mL / cm 2 ;

[0023] Step 5, allowing the coated nylon fabric to stand for 20 minutes, and then hot pressing to obtain a composite nylon fabric, wherein the atmosphere of the standing is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10:1, and the temperature is 40° C.; the temperature of the hot pressing is 230° C. and the pressure is 0.3-0.5 MPa;

[0024] Step 6, the cotton fabric is adhered to the surface of the composite nylon fabric with a polyurethane adhesive, hot-pressed to obtain a cold-resistant fabric, and then the cold-resistant fabric is cut into work clothes to obtain waterproof cold-resistant work clothes, wherein the mass of the cotton fabric is 20% of the composite nylon fabric, and the mass of the polyurethane adhesive is 1% of the composite nylon fabric.

[0025] Example 2

[0026] A method for preparing waterproof and cold-resistant work clothes comprises the following steps:

[0027] Step 1, adding formic acid to ethanol and stirring thoroughly to form a mixed solvent, then adding refined nylon 66 and heating and ultrasonicating for 30 minutes, and heating to obtain a nylon solution; the volume ratio of formic acid to ethanol is 5:7, the stirring speed for uniform stirring is 500r / min, the mass ratio of nylon 66 to formic acid is 1:1, the temperature of the heating and ultrasonicating is 60°C, the ultrasonic frequency is 100kHz, and the heating temperature is 90°C; wherein the nylon 66 refinement method comprises the following steps: a1, Nylon 66 is blended with ether and then subjected to cryogenic grinding for 3 hours to obtain a refined material, wherein the mass ratio of nylon 66 to ether is 5:2, the mixing temperature is 10°C, the cryogenic grinding temperature is 5°C, and the grinding pressure is 0.8MPa; a2, the refined material is subjected to constant temperature purging to obtain refined nylon powder, and the purged tail gas is cooled and collected to obtain ether, wherein the constant temperature purging adopts dry nitrogen, and the temperature of the nitrogen is 80°C, the purging rate is 30g / L, and the cooling collection temperature is 5°C;

[0028] Step 2, electrospinning the nylon solution and hot pressing it to obtain nylon fabric, wherein the electrospinning pressure is 30 kV, the receiving distance is 20 cm, the receiving speed is 150 r / min, and the infusion speed is 0.3 mm / min;

[0029] Step 3: spray formic acid onto the surface of the nylon fabric and let it stand for 30 minutes, then rinse it with ethanol, and dry it to obtain a nylon fabric with a rough surface. The spray volume is 2 mL / cm 2 The static temperature is 30°C, the drying temperature is 80°C, and the spray volume of the secondary spray is 0.9 mL / cm 2 , temperature is 5℃;

[0030] Step 4, adding dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane to ether and stirring evenly, then adding formic acid to form a mixed silane liquid, and finally spraying the mixed silane liquid onto the nylon fabric to obtain a coated nylon fabric, wherein the molar ratio of the dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane is 3:5:1, the concentration of the dichlorodimethylsilane in the ether is 200 g / L, the stirring speed for uniform stirring is 800 r / min, the amount of formic acid added is 5% of the volume of the ether, and the spraying amount of the spray is 5 mL / cm 2 ;

[0031] Step 5, allowing the coated nylon fabric to stand for 30 minutes, and then hot pressing to obtain a composite nylon fabric, wherein the atmosphere of the standing is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 12:1, and the temperature is 50° C.; the temperature of the hot pressing is 235° C. and the pressure is 0.5 MPa;

[0032] Step 6, the cotton fabric is adhered to the surface of the composite nylon fabric with a polyurethane adhesive, hot-pressed to obtain a cold-resistant fabric, and then the cold-resistant fabric is cut into work clothes to obtain waterproof cold-resistant work clothes, wherein the mass of the cotton fabric is 50% of the composite nylon fabric, and the mass of the polyurethane adhesive is 2% of the composite nylon fabric.

[0033] Example 3

[0034] A method for preparing waterproof and cold-resistant work clothes comprises the following steps:

[0035] Step 1, adding formic acid to ethanol and stirring thoroughly to form a mixed solvent, then adding refined nylon 66 and heating and ultrasonicating for 25 minutes, and heating to obtain a nylon solution; the volume ratio of formic acid to ethanol is 5:6, the stirring speed for uniform stirring is 400r / min, the mass ratio of nylon 66 to formic acid is 6:7, the temperature of the heating and ultrasonicating is 55°C, the ultrasonic frequency is 90kHz, and the heating temperature is 85°C; wherein the nylon 66 refinement method comprises the following steps: a1, Nylon 66 is blended with ether and then subjected to cryogenic grinding for 3 hours to obtain a refined material, wherein the mass ratio of nylon 66 to ether is 5:2, the mixing temperature is 8°C, the cryogenic grinding temperature is 3°C, and the grinding pressure is 0.7MPa; a2, the refined material is subjected to constant temperature purging to obtain refined nylon powder, and the purged tail gas is cooled and collected to obtain ether, wherein the constant temperature purging adopts dry nitrogen, and the temperature of the nitrogen is 70°C, the purging rate is 20g / L, and the cooling collection temperature is 3°C;

[0036] Step 2, electrospinning the nylon solution and hot pressing it to obtain nylon fabric, wherein the electrospinning pressure is 25 kV, the receiving distance is 20 cm, the receiving speed is 130 r / min, and the infusion speed is 0.2 mm / min;

[0037] Step 3: spray formic acid onto the surface of the nylon fabric and let it stand for 25 minutes, then rinse it with ethanol, and dry it to obtain a nylon fabric with a rough surface. The spray volume is 2 mL / cm 2 The static temperature is 25°C, the drying temperature is 75°C, and the spray volume of the secondary spray is 0.7 mL / cm 2 , temperature is 3℃;

[0038] Step 4, adding dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane to ether and stirring evenly, then adding formic acid to form a mixed silane liquid, and finally spraying the mixed silane liquid onto the nylon fabric to obtain a coated nylon fabric, wherein the molar ratio of the dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane is 3:4:1, the concentration of the dichlorodimethylsilane in the ether is 150 g / L, the stirring speed for uniform stirring is 600 r / min, the amount of formic acid added is 4% of the volume of the ether, and the spraying amount of the spray is 4 mL / cm 2 ;

[0039] Step 5, allowing the coated nylon fabric to stand for 25 minutes, and then hot pressing to obtain a composite nylon fabric, wherein the atmosphere of the standing is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 12:1, and the temperature is 45° C.; the temperature of the hot pressing is 233° C. and the pressure is 0.4 MPa;

[0040] Step 6: The cotton fabric is adhered to the surface of the composite nylon fabric with a polyurethane adhesive, and hot-pressed to obtain a cold-resistant fabric. The cold-resistant fabric is then cut into work clothes to obtain waterproof cold-resistant work clothes. The mass of the cotton fabric is 30% of the composite nylon fabric, and the mass of the polyurethane adhesive is 2% of the composite nylon fabric.

[0041] Comparative Example 1

[0042] A method for preparing waterproof and cold-resistant work clothes comprises the following steps:

[0043] Step 1, adding formic acid to ethanol and stirring thoroughly to form a mixed solvent, then adding refined nylon 66 and heating and ultrasonicating for 25 minutes, and heating to obtain a nylon solution; the volume ratio of formic acid to ethanol is 5:6, the stirring speed for uniform stirring is 400r / min, the mass ratio of nylon 66 to formic acid is 6:7, the temperature of the heating and ultrasonicating is 55°C, the ultrasonic frequency is 90kHz, and the heating temperature is 85°C; wherein the nylon 66 refinement method comprises the following steps: a1, Nylon 66 is blended with ether and then subjected to cryogenic grinding for 3 hours to obtain a refined material, wherein the mass ratio of nylon 66 to ether is 5:2, the mixing temperature is 8°C, the cryogenic grinding temperature is 3°C, and the grinding pressure is 0.7MPa; a2, the refined material is subjected to constant temperature purging to obtain refined nylon powder, and the purged tail gas is cooled and collected to obtain ether, wherein the constant temperature purging adopts dry nitrogen, and the temperature of the nitrogen is 70°C, the purging rate is 20g / L, and the cooling collection temperature is 3°C;

[0044] Step 2, electrospinning the nylon solution and hot pressing it to obtain nylon fabric, wherein the electrospinning pressure is 25 kV, the receiving distance is 20 cm, the receiving speed is 130 r / min, and the infusion speed is 0.2 mm / min;

[0045] Step 3, cotton fabric is adhered to the surface of nylon fabric with polyurethane adhesive, hot-pressed to obtain fabric, and then the fabric is cut into work clothes to obtain work clothes, the mass of the cotton fabric is 30% of the composite nylon fabric, and the mass of the polyurethane adhesive is 2% of the composite nylon fabric.

[0046] Performance Testing

[0047] The prepared fabrics of Examples 1-3 and Comparative Example were tested as follows:

[0048]

[0049]

[0050] The above data show that the fabric provided by the technical solution has good hydrophobicity and oleophobicity, and with the silicone material as the surface, it shows excellent wear resistance, and the thermal insulation rate of the fabric is high, ensuring that it has good cold resistance; after washing 50 times, its thermal insulation rate and hydrophobicity and oleophobicity remain basically unchanged. That is, the fabric in the technical solution has good waterproof and cold resistance.

[0051] It is understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A method for preparing waterproof and cold-resistant work clothes, characterized in that: The preparation method comprises the following steps: Step 1, adding formic acid to ethanol and stirring thoroughly to form a mixed solvent, then adding refined nylon 66 and heating and ultrasonicating for 20-30 minutes to obtain a nylon solution by heating; Step 2, electrospinning the nylon solution and hot pressing it to obtain a nylon fabric; Step 3, spraying formic acid onto the surface of the nylon fabric and leaving it to stand for 20-30 minutes, then rinsing it with ethanol, and drying it to obtain a nylon fabric with a rough surface; Step 4, adding dichlorodimethylsilane, dichlorodiisopropylsilane, and trichlorododecylsilane into ether and stirring evenly, then adding formic acid to form a mixed silane liquid, and finally spraying the mixed silane liquid onto the nylon fabric to obtain a coated nylon fabric; Step 5, leaving the coated nylon fabric to stand for 20-30 minutes, and then hot pressing to obtain a composite nylon fabric; Step 6, the cotton fabric is adhered to the surface of the composite nylon fabric by using a polyurethane adhesive, hot-pressed to obtain a cold-resistant fabric, and then the cold-resistant fabric is cut into work clothes to obtain waterproof cold-resistant work clothes.

2. The method for preparing the waterproof and cold-resistant work clothes according to claim 1, characterized in that: The volume ratio of formic acid to ethanol in step 1 is 5:5-7, the stirring speed for uniform stirring is 200-500r / min, the mass ratio of nylon 66 to formic acid is 5-7:7, the temperature of the heating ultrasound is 50-60°C, and the ultrasonic frequency is 80-100kHz.

3. The method for preparing the waterproof and cold-resistant work clothes according to claim 1, characterized in that: The heating temperature in step 1 is 80-90°C.

4. The method for preparing the waterproof and cold-resistant work clothes according to claim 1, characterized in that: The method for refining nylon 66 in step 1 comprises the following steps: a1, blending nylon 66 with ether, and then subjecting the mixture to cryogenic grinding for 2-3 hours to obtain a refined material, wherein the mass ratio of nylon 66 to ether is 5:1-2, the mixing temperature is 5-10°C, the cryogenic grinding temperature is 0-5°C, and the grinding pressure is 0.6-0.8MPa; a2, subjecting the refined material to constant temperature purging to obtain refined nylon powder, and cooling and collecting the purged tail gas to obtain ether, wherein the constant temperature purging uses dry nitrogen, and the temperature of the nitrogen is 60-80°C, the purging speed is 10-30g / L, and the cooling and collecting temperature is 0-5°C.

5. The method for preparing the waterproof and cold-resistant work clothes according to claim 1, characterized in that: The electrospinning pressure in step 2 is 20-30 kV, the receiving distance is 15-20 cm, the receiving rotation speed is 100-150 r / min, and the perfusion speed is 0.1-0.3 mm / min.

6. The method for preparing waterproof and cold-resistant work clothes according to claim 1, characterized in that: The spray volume in step 3 is 1-2 mL / cm 2 The static temperature is 20-30°C, the drying temperature is 70-80°C, and the spray volume of the secondary spray is 0.5-0.9 mL / cm 2 , temperature is 0-5℃.

7. The method for preparing the waterproof and cold-resistant work clothes according to claim 1, characterized in that: The molar ratio of dichlorodimethylsilane, dichlorodiisopropylsilane and trichlorododecylsilane in step 4 is 2-3:3-5:1, the concentration of dichlorodimethylsilane in ether is 100-200 g / L, and the stirring speed for uniform stirring is 400-800 r / min.

8. The method for preparing the waterproof and cold-resistant work clothes according to claim 1, characterized in that: The amount of formic acid added in step 4 is 3-5% of the volume of ether, and the spray volume of the spray is 3-5 mL / cm 2 .

9. The method for preparing waterproof and cold-resistant work clothes according to claim 1, characterized in that: The static atmosphere in step 5 is a mixed atmosphere of nitrogen and water vapor, and the volume ratio of nitrogen to water vapor is 10-12:1, and the temperature is 40-50°C; the temperature of the hot pressing molding is 230-235°C, and the pressure is 0.3-0.5MPa.

10. The method for preparing waterproof and cold-resistant work clothes according to claim 1, characterized in that: The mass of the cotton fabric in step 6 is 20-50% of the composite nylon fabric, and the mass of the polyurethane adhesive is 1-2% of the composite nylon fabric.

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