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Cross-linking agent for water-repellent and oil-repellent finishing and preparation method and application of cross-linking agent

A technology of crosslinking agent and catalyst, which is applied in the field of crosslinking agent for water and oil repellent finishing and its preparation, can solve the problems of low glass transition temperature, low function, inability to arrange water and oil repellent finishing agents neatly, etc., and achieve improvement The effect of water and oil repellency

Active Publication Date: 2021-02-12
SUZHOU TANGHUA NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are currently two technical problems. On the one hand, the most commonly used non-woven material, polypropylene, has a low glass transition temperature and cannot be baked at a high temperature to make the water and oil repellent finishing agents efficiently and neatly arranged. On the other hand, the water and oil repellency of the C8 series in the general market is relatively high, but C8 water repellent contains PFOA and PFOS that may be potentially harmful to the human body, which is the industry standard in the European and American markets. Restriction, banning the sale of textiles with PFOA and PFOS content exceeding 0.05%, so C6 fluorine-containing finishing agents are mostly used in the market for water and oil repellent finishing of textiles, but the water and oil repellency of C6 series finishing is lower than that of C8 series finishing agents. Moreover, the composition of the medical protective fabric is polyethylene, and the glass transition temperature of polyethylene is low. It is also impossible to enhance the orderly arrangement of the waterproofing agent by increasing the baking temperature to improve the function of water and oil repellency.

Method used

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  • Cross-linking agent for water-repellent and oil-repellent finishing and preparation method and application of cross-linking agent
  • Cross-linking agent for water-repellent and oil-repellent finishing and preparation method and application of cross-linking agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to the mass ratio of 1:0.06:0.8:1.1, put chitosan, dibutyltin diacetate, acetic acid, and ethyl acetate into a four-necked flask to make a mixed solution A, and start the stirrer to stir. According to the mass ratio of 1:2, dissolve propyl isocyanate in ethyl acetate to make mixed solution B, after stirring evenly, drop mixed solution B into mixed solution A at a speed of 3ml / min, mixed solution The feeding volume ratio of A to mixed liquid B is 1:0.45. During the dropwise addition process, keep a constant temperature of 30°C. After the dropwise addition is completed, slowly raise the temperature of the liquid to 70°C, continue stirring for 2 hours, then stop heating, let the liquid slowly drop to 20°C, and then place the four-neck flask in a cold bath , adjust the temperature to -10°C, and after the crystals are precipitated, filter and wash with ethanol three times to obtain the product modified chitosan crosslinking agent, which is set aside.

[0038] Mix ...

Embodiment 2

[0040] According to the mass ratio of 1:0.08:1.0:1.2, put chitosan, stannous octoate, acetic acid, and ethyl acetate into four-necked flask A to make mixed solution A, and start the stirrer to stir. According to the mass ratio of 1:2.5, dissolve propyl isocyanate in ethyl acetate to make mixed solution B, after stirring evenly, drop mixed solution B into mixed solution A at a speed of 4ml / min, mixed solution The feeding volume ratio of A to mixed liquid B is 1:0.5. During the dropwise addition process, keep a constant temperature of 35°C. After the dropwise addition is completed, slowly raise the temperature of the liquid to 75°C, continue stirring for 2.5 hours, then stop heating, let the liquid slowly drop to 20°C, and then place the four-neck flask in a cold bath , adjust the temperature to -12°C, and after the crystals are precipitated, filter and wash with ethanol three times to obtain the product modified chitosan cross-linking agent, which is set aside.

[0041] Mix th...

Embodiment 3

[0043] According to the mass ratio of 1:0.1:1.2:1.6, chitosan, dibutyltin di(dodecylsulfide), acetic acid, and ethyl acetate were put into a four-necked flask to make a mixed solution A, and the stirrer was started to stir. According to the mass ratio of 1:3, dissolve propyl isocyanate in ethyl acetate to make mixed solution B, after stirring evenly, drop mixed solution B into mixed solution A at a speed of 5ml / min, mixed solution A The feeding volume ratio of mixed liquid B is 1:0.55. During the dropwise addition process, keep a constant temperature of 40°C. After the dropwise addition is completed, slowly raise the temperature of the liquid to 80°C, continue stirring for 3 hours, then stop heating, let the liquid slowly drop to 20°C, and then place the four-neck flask in a cold bath , adjust the temperature to -15°C, and after the crystals are precipitated, filter and wash with ethanol three times to obtain the product modified chitosan crosslinking agent, which is set aside...

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Abstract

The invention relates to a cross-linking agent and a preparation method and application thereof. The cross-linking agent is prepared by grafting reaction of chitosan and propyl isocyanate under the action of a catalyst. The modified oligochitosan serves as a cross-linking agent and has a hydroxymethyl group and an epoxy group at the same time, chitosan has a film-forming property, the modified oligochitosan serves as the cross-linking agent and is used together with a fluorine-containing finishing agent, and the finishing agent and a fabric are firmly combined through the cross-linking effectand the film-forming effect of the cross-linking agent, and the water and oil repellency of the fabric can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of textile post-finishing, and in particular relates to a crosslinking agent for water- and oil-repellent finishing and a preparation method and application thereof. Background technique [0002] In the form of an epidemic outbreak, the problem of safety protection for medical staff is particularly prominent. During the process of close contact with patients, protective personnel will often come into contact with the patient's body fluids, blood, medicinal liquid, etc., requiring protective clothing with strong anti-penetration properties. In order to improve the impermeability of protective clothing, it is necessary to improve the waterproof, oil-proof, anti-blood and alcohol penetration capabilities of the fabric at the same time. It is necessary to use fluorine-based water-repellent and oil-repellent finishing agents to finish the fabric, and to achieve higher water repellency. Oil repellency level. How...

Claims

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Application Information

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IPC IPC(8): C08B37/08D06M15/03
CPCC08B37/003D06M15/03D06M2200/11D06M2200/12
Inventor 陈艳珍王鹏张仁海
Owner SUZHOU TANGHUA NANO TECH
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