Processing technology of a military clothing fabric with good waterproof performance

Abstract

The present invention discloses a processing technology for a military clothing fabric with good waterproof performance. In the present invention, a nano-silica coating material is prepared by the sol-gel method. Subsequently, through a double-bond addition reaction, acrylamide and 2-ethylhexyl acrylate form a polymer that interpenetrates and winds around the nano-silica to obtain modified nano-silica. At the same time, a polymer is formed on the surface of the nano-silica, improving the flame retardancy of the nano-silica; the active functional groups in the polymer can react with the hydroxyl groups in the pretreated fabric, improving the binding firmness between the modified nano-silica and the fabric, and further improving the washability of the fabric; octadecyltrimethoxysilane is used to perform hydrophobic modification on the preliminarily modified fabric, improving 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 military clothing fabric with good waterproof performance. Background Art

[0002] Military clothing fabrics are a type of material 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 temperature differences between day and night and strong light, or burning areas where bullets are flying, so higher requirements are put forward for the fabrics of military uniforms: having good moisture absorption and sweat discharge properties to ensure comfortable wearing; having good anti-mosquito, anti-mildew and 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 properties to ensure being able to shuttle through burning areas.

[0003] Chinese patent document CN201610826073.5 discloses a preparation method of a fabric with flame retardant and hydrophobic functions, including the following steps: using an aqueous solution containing polycarboxylic acid and a catalyst to perform padding finishing on the fabric, and obtaining a pretreated fabric after drying; mixing siloxane, cationic surfactant and non-ionic surfactant in water, then adding a flame retardant, adjusting the pH to 2-3 for reaction to obtain a sol doped with the flame retardant; adding a silicate ester to the sol for reaction, after the reaction is completed, adding a long-chain alkyl silane as a hydrophobic agent to continue the reaction to obtain a flame retardant and hydrophobic finishing solution; immersing the above pretreated fabric in the flame retardant and hydrophobic finishing solution, and obtaining a fabric with flame retardant and hydrophobic functions after padding-baking, washing, and drying. Although the fabric finished by this method has certain flame retardancy and hydrophobicity, it still needs to be further improved to meet the actual needs. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a processing technology for a military clothing fabric with good waterproof performance. The prepared military clothing fabric has the characteristics of good flame retardant performance, good waterproof performance, and resistance to washing.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A processing technology for a military clothing fabric with good waterproof performance includes the following steps:

[0007] (1) Immerse the fabric in a sodium hydroxide solution, take it out after heat treatment, and wash it with water to obtain a pretreated fabric;

[0008] (2) Immerse the pretreated fabric in the finishing solution for padding treatment, and then dry the padded fabric to obtain a preliminarily modified fabric;

[0009] (3) Immerse the preliminarily modified fabric in an octadecyltrimethoxysilane solution, and after padding, perform baking, washing, and drying treatments to obtain a military clothing fabric with good waterproof performance.

[0010] Preferably, in step (1), the mass fraction of the sodium hydroxide solution is 3-6%.

[0011] Preferably, in step (2), the preparation method of the finishing solution is as follows:

[0012] S1. Add tetraethyl orthosilicate solution and acrylamide solution to liquid paraffin, then add emulsifier Span80, stir and mix evenly, then dropwise add an alkali solution to adjust the pH of the solution to 8-9, stir for 3-5 h, and then let it stand for 2-4 h. After washing, dialysis, and freeze-drying, obtain nano-silica coated material;

[0013] S2. Disperse the nano-silica coated material in an ethanol aqueous solution, then add 2-ethylhexyl acrylate, stir and mix evenly, then add potassium persulfate and N,N-methylenebisacrylamide, and react under a nitrogen atmosphere. After the reaction is completed, filter, wash, and dry to obtain modified nano-silica;

[0014] S3. Add the modified nano-silica and sodium dodecyl sulfate to water, and mix evenly to obtain the finishing solution.

[0015] Preferably, in step S1, the mass ratio of tetraethyl orthosilicate solution, acrylamide solution, liquid paraffin, and emulsifier Span80 is 10-20:5-10:60-90:1-3, the mass ratio of tetraethyl orthosilicate, ethanol, and water in the tetraethyl orthosilicate solution is 3-5:20-30:5-10, the pH of the tetraethyl orthosilicate solution is 3-4, and the mass fraction of the acrylamide solution is 20-30%.

[0016] Preferably, in step S2, the mass ratio of nano-silica coated material, 2-ethylhexyl acrylate, potassium persulfate, and N,N-methylenebisacrylamide is 10-15:5-8:0.2-0.4:0.06-0.1.

[0017] Preferably, in step S2, the reaction temperature is 60-70 °C, and the reaction time is 2-3 h.

[0018] Preferably, in step S3, the mass ratio of modified nano-silica, sodium dodecyl sulfate, and water is 40-60:1-3:1000.

[0019] Preferably, in step (2), the liquor ratio is 1:20 - 30, and the padding rate is 60 - 70%.

[0020] Preferably, in step (3), the mass fraction of the octadecyltrimethoxysilane solution is 1 - 3%.

[0021] Preferably, in step (3), the liquor ratio is 1:25 - 30, and the padding rate is 60 - 80%.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The present invention uses the sol - gel method to prepare nano - silica coating material, and at the same time loads acrylamide in the nano - silica. Subsequently, through the double - bond addition reaction, acrylamide and 2 - ethylhexyl acrylate form a polymer that interpenetrates and winds around the nano - silica to obtain modified nano - silica. At the same time, a polymer is formed on the surface of the nano - silica, improving the flame - retardant performance of the nano - silica; the active functional groups in the polymer can react with the hydroxyl groups in the pretreated fabric, improving the bonding firmness between the modified nano - silica and the fabric, and further improving the wash - resistance of the fabric; then octadecyltrimethoxysilane is used to perform hydrophobic modification on the preliminarily modified fabric, improving the waterproof performance of the fabric.

[0024] (2) If the fabric is first treated with an octadecyltrimethoxysilane solution and then treated with the finishing solution in the present invention, the waterproof performance of the prepared fabric is not ideal. The reason may be that octadecyltrimethoxysilane is not easily loaded on the surface of the fabric, resulting in a deterioration of the waterproof performance of the fabric. Specific Embodiments

[0025] The following further elaborates on the present invention through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0026] It should be noted that unless otherwise specified, the chemical reagents involved in the present invention are all purchased through commercial channels.

[0027] The fabric base 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 .

[0028] Example 1

[0029] A processing technology for a military clothing fabric with good waterproof performance includes the following steps:

[0030] (1) Immerse the fabric in a 3wt% sodium hydroxide solution, heat and stir at 60°C for 60 min, then take it out and wash it with water to obtain the pretreated fabric;

[0031] (2) Immerse the pretreated fabric in the finishing solution for padding treatment. The bath ratio is 1:20 and the liquor pickup rate is 60%. Then dry the padded fabric to obtain a preliminarily modified fabric.

[0032] The preparation method of the finishing solution is as follows:

[0033] S1. Add 10 g of tetraethyl orthosilicate solution and 5 g of 20 wt% acrylamide solution to 60 g of liquid paraffin. The mass ratio of tetraethyl orthosilicate, ethanol and water in the tetraethyl orthosilicate solution is 3:20:7, and the pH of the tetraethyl orthosilicate solution is 3. Then add 1 g of emulsifier Span80, stir and mix evenly. Subsequently, add an alkali solution to adjust the pH of the solution to 9, stir for 3 h, then let it stand for 2 h. After washing, dialysis and freeze-drying, obtain nano-silica coated material.

[0034] S2. Disperse 10 g of nano-silica coated material in 150 g of 60 wt% ethanol aqueous solution, then add 5 g of 2-ethylhexyl acrylate, stir and mix evenly. Then add 0.2 g of potassium persulfate and 0.06 g of N,N-methylenebisacrylamide, react at 60 °C under a nitrogen atmosphere for 2 h. After the reaction is completed, filter, wash and dry to obtain modified nano-silica.

[0035] S3. Add 40 g of modified nano-silica and 1 g of sodium dodecyl sulfate to 1000 g of water, mix evenly to obtain the finishing solution.

[0036] (3) Immerse the preliminarily modified fabric in a 1 wt% octadecyltrimethoxysilane solution, with a bath ratio of 1:25 and a liquor pickup rate of 60%. After padding, perform baking, washing and drying treatments to obtain a military clothing fabric with good waterproof performance.

[0037] Example 2

[0038] A processing technology for a military clothing fabric with good waterproof performance, including the following steps:

[0039] (1) Immerse the fabric in a 5 wt% sodium hydroxide solution, heat and stir at 60 °C for 60 min, then take it out and wash it with water to obtain a pretreated fabric.

[0040] (2) Immerse the pretreated fabric in the finishing solution for padding treatment. The bath ratio is 1:30 and the liquor pickup rate is 65%. Then dry the padded fabric to obtain a preliminarily modified fabric.

[0041] The preparation method of the finishing solution is as follows:

[0042] S1. Add 20 g of tetraethyl orthosilicate solution and 10 g of 20 wt% acrylamide solution to 90 g of liquid paraffin. The mass ratio of tetraethyl orthosilicate, ethanol and water in the tetraethyl orthosilicate solution is 5:30:5, and the pH of the tetraethyl orthosilicate solution is 4. Then add 3 g of emulsifier Span80, stir and mix evenly. Subsequently, add an alkali solution dropwise to adjust the pH of the solution to 9, stir for 4 h, then let it stand for 3 h, and obtain nano-silica coating material after washing, dialysis and freeze-drying;

[0043] S2. Disperse 15 g of nano-silica coating material in 150 g of 60 wt% ethanol aqueous solution, then add 8 g of 2-ethylhexyl acrylate, stir and mix evenly, then add 0.4 g of potassium persulfate and 0.08 g of N,N-methylenebisacrylamide, react at 70 °C for 2 h under a nitrogen atmosphere. After the reaction is completed, filter, wash and dry to obtain modified nano-silica;

[0044] S3. Add 60 g of modified nano-silica and 3 g of sodium dodecyl sulfate to 1000 g of water, mix evenly to obtain the finishing solution.

[0045] (3) Immerse the preliminarily modified fabric in a 3 wt% octadecyltrimethoxysilane solution, with a bath ratio of 1:30 and a padding rate of 60%. After padding, perform baking, washing and drying treatments to obtain a military clothing fabric with good waterproof performance.

[0046] Example 3

[0047] A processing technology for a military clothing fabric with good waterproof performance includes the following steps:

[0048] (1) Immerse the fabric in a 5 wt% sodium hydroxide solution, heat and stir at 60 °C for 60 min, then take it out and wash it with water to obtain a pretreated fabric;

[0049] (2) Immerse the pretreated fabric in the finishing solution for padding treatment, with a bath ratio of 1:25 and a padding rate of 70%. Then dry the padded fabric to obtain a preliminarily modified fabric;

[0050] The preparation method of the finishing solution is as follows:

[0051] S1. Add 15 g of tetraethyl orthosilicate solution and 8 g of 30 wt% acrylamide solution to 90 g of liquid paraffin. The mass ratio of tetraethyl orthosilicate, ethanol and water in the tetraethyl orthosilicate solution is 5:30:5, and the pH of the tetraethyl orthosilicate solution is 3. Then add 2 g of emulsifier Span80, stir and mix evenly. Subsequently, add an alkali solution dropwise to adjust the pH of the solution to 9, stir for 5 h, then let it stand for 4 h, and obtain nano-silica coating material after washing, dialysis and freeze-drying;

[0052] S2. Disperse 12 g of nano-silica coating material in 150 g of 60 wt% ethanol aqueous solution, then add 6 g of 2-ethylhexyl acrylate, stir and mix evenly, then add 0.3 g of potassium persulfate and 0.08 g of N,N-methylenebisacrylamide, react at 70 °C for 3 h under a nitrogen atmosphere. After the reaction is completed, filter, wash, and dry to obtain modified nano-silica;

[0053] S3. Add 50 g of modified nano-silica and 2 g of sodium dodecyl sulfate to 1000 g of water, mix evenly to obtain the finishing solution.

[0054] (3) Immerse the preliminarily modified fabric in a 2 wt% octadecyltrimethoxysilane solution, with a bath ratio of 1:30 and a liquor pickup rate of 80%. After padding, perform baking, washing, and drying treatments to obtain a military clothing fabric with good waterproof performance.

[0055] Comparative Example 1

[0056] A processing technology for military clothing fabric includes the following steps:

[0057] (1) Immerse the fabric in a 5 wt% sodium hydroxide solution, heat and stir at 60 °C for 60 min, then take it out and wash with water to obtain the pretreated fabric;

[0058] (2) Immerse the pretreated fabric in the finishing solution for padding treatment, with a bath ratio of 1:25 and a liquor pickup rate of 70%. Then dry the padded fabric to obtain the preliminarily modified fabric;

[0059] The preparation method of the finishing solution is as follows:

[0060] S1. Add 15 g of tetraethyl orthosilicate solution to 90 g of liquid paraffin. The mass ratio of tetraethyl orthosilicate, ethanol, and water in the tetraethyl orthosilicate solution is 5:30:5, and the pH of the tetraethyl orthosilicate solution is 3. Then add 2 g of emulsifier Span80, stir and mix evenly. Subsequently, dropwise add an alkali solution to adjust the pH of the solution to 9, stir for 5 h, then let it stand for 4 h, and perform washing, dialysis, and freeze-drying to obtain nano-silica;

[0061] S2. Add 50 g of nano-silica and 2 g of sodium dodecyl sulfate to 1000 g of water, mix evenly to obtain the finishing solution.

[0062] (3) Immerse the preliminarily modified fabric in a 2 wt% octadecyltrimethoxysilane solution, with a bath ratio of 1:30 and a liquor pickup rate of 80%. After padding, perform baking, washing, and drying treatments to obtain the military clothing fabric.

[0063] Comparative Example 2

[0064] A processing technology for a military clothing fabric, comprising the following steps:

[0065] (1) Immerse the fabric in a 5wt% sodium hydroxide solution, heat and stir at 60°C for 60 minutes, then take it out and wash it with water to obtain a pretreated fabric;

[0066] (2) Immerse the pretreated fabric in a 2wt% octadecyltrimethoxysilane solution, with a bath ratio of 1:30 and a padding rate of 80%. After padding, perform baking, washing, and drying treatments to obtain a preliminarily modified fabric;

[0067] (3) Immerse the preliminarily modified fabric in a finishing solution for padding treatment, with a bath ratio of 1:25 and a padding rate of 70%. Then dry the padded fabric to obtain the military clothing fabric;

[0068] The preparation method of the finishing solution is as follows:

[0069] S1. Add 15g of tetraethyl orthosilicate solution and 8g of 30wt% acrylamide solution to 90g of liquid paraffin. The mass ratio of tetraethyl orthosilicate, ethanol, and water in the tetraethyl orthosilicate solution is 5:30:5, and the pH of the tetraethyl orthosilicate solution is 3. Then add 2g of emulsifier Span80, stir and mix evenly. Subsequently, dropwise add an alkali solution to adjust the pH of the solution to 9, stir for 5 hours, then let it stand for 4 hours. After washing, dialysis, and freeze-drying, obtain a nano-silica coated material;

[0070] S2. Disperse 12g of the nano-silica coated material in 150g of 60wt% ethanol aqueous solution, then add 6g of 2-ethylhexyl acrylate, stir and mix evenly. Then add 0.3g of potassium persulfate and 0.08g of N,N-methylenebisacrylamide, react at 70°C under a nitrogen atmosphere for 3 hours. After the reaction is completed, filter, wash, and dry to obtain modified nano-silica;

[0071] S3. Add 50g of the modified nano-silica and 2g of sodium dodecyl sulfate to 1000g of water, mix evenly to obtain the finishing solution.

[0072] Perform performance tests on the fabrics prepared in Examples 1-3 and Comparative Examples 1-3, as follows:

[0073] Limiting oxygen index test: Conduct the test according to the standard of GB / T 5454-1997 "Textiles - Burning performance test - Oxygen index method";

[0074] Contact angle (CA) test: Use an OCA contact angle tester, set the water droplet to 3μL, measure at three different positions, and take the average of the test results; The test results are shown in Table 1 below:

[0075] Table 1

[0076] LOI(%) CA(°) Example 1 32.9 134.3 Example 2 33.0 137.1 Example 3 33.4 136.8 Comparative Example 1 27.7 129.5 Comparative Example 2 32.5 98.6

[0077] The fabrics prepared in Examples 1-3 were washed 50 times. The washing method was carried out according to the standard of GB / T 8629-2017 "Textiles - Home laundering and drying procedures for testing". Then, the limiting oxygen index and contact angle were tested. The test results are shown in Table 2:

[0078] Table 2

[0079] LOI(%) CA(°) Example 1 32.3 129.2 Example 2 32.1 130.5 Example 3 32.6 128.4

[0080] 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 modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection required by the present invention.

Claims

1. A processing technology for a military clothing fabric with good waterproof performance, characterized in that, It includes the following steps: (1) Immerse the fabric in a sodium hydroxide solution, take it out after heat treatment, and wash it with water to obtain a pretreated fabric; (2) Immerse the pretreated fabric in a finishing solution for padding treatment, and then dry the padded fabric to obtain a preliminarily modified fabric; (3) Immerse the preliminarily modified fabric in an octadecyltrimethoxysilane solution, pad it, and then perform baking, washing, and drying treatments to obtain a military clothing fabric with good waterproof performance; Among them, in step (1), the fabric used is polyester Oxford cloth; In step (2), the preparation method of the finishing solution is as follows: S1. Add tetraethyl orthosilicate solution and acrylamide solution to liquid paraffin, then add emulsifier Span80, stir and mix evenly, then dropwise add an alkali solution to adjust the pH of the solution to 8-9, stir for 3-5 h, then let it stand for 2-4 h, and after washing, dialysis, and freeze-drying, obtain nano-silica coated material; S2. Disperse the nano-silica coated material in an ethanol aqueous solution, then add 2-ethylhexyl acrylate, stir and mix evenly, then add potassium persulfate and N,N-methylenebisacrylamide, and react under a nitrogen atmosphere. After the reaction is completed, filter, wash, and dry to obtain modified nano-silica; S3. Add the modified nano-silica and sodium dodecyl sulfate to water, and mix evenly to obtain the finishing solution.

2. The processing technology of the military clothing fabric with good waterproof performance according to claim 1, characterized in that, In step (1), the mass fraction of the sodium hydroxide solution is 3-6%.

3. The processing technology of the military clothing fabric with good waterproof performance according to claim 1, characterized in that, In step S1, the mass ratio of tetraethyl orthosilicate solution, acrylamide solution, liquid paraffin, and emulsifier Span80 is 10-20:5-10:60-90:1-3, the mass ratio of tetraethyl orthosilicate, ethanol, and water in the tetraethyl orthosilicate solution is 3-5:20-30:5-10, the pH of the tetraethyl orthosilicate solution is 3-4, and the mass fraction of the acrylamide solution is 20-30%.

4. The processing technology of the military clothing fabric with good waterproof performance according to claim 1, characterized in that, In step S2, the mass ratio of nano-silica coated material, 2-ethylhexyl acrylate, potassium persulfate, and N,N-methylenebisacrylamide is 10-15:5-8:0.2-0.4:0.06-0.

1.

5. The processing technology of the military clothing fabric with good waterproof performance according to claim 1, characterized in that, In step S2, the reaction temperature is 60-70 °C, and the reaction time is 2-3 h.

6. The processing technology of the military clothing fabric with good waterproof performance according to claim 1, characterized in that, In step S3, the mass ratio of modified nano-silica, sodium dodecyl sulfate, and water is 40-60:1-3:1000.

7. The processing technology of the military clothing fabric with good waterproof performance according to claim 1, characterized in that In step (2), the liquor ratio is 1:20-30, and the padding rate is 60-70%.

8. The processing technology of the military clothing fabric with good waterproof performance according to claim 1, characterized in that, In step (3), the mass fraction of the octadecyltrimethoxysilane solution is 1-3%.

9. The processing technology of the military clothing fabric with good waterproof performance according to claim 1, characterized in that, In step (3), the liquor ratio is 1:25-30, and the padding rate is 60-80%.