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A waterproof and moisture-permeable film and its preparation method and application

A film and reaction technology, applied in the field of film and its preparation, can solve the problems of poor water-repellent processing performance, difficult to decompose PTFE, airtight fabric, etc.

Active Publication Date: 2018-01-09
拉萨经济技术开发区美第意户外用品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional fabrics are airtight and feel stuffy when worn. The sweat produced by the human body cannot be drained out of the clothing, and condensation accumulates on the inner surface of the clothing, making people feel uncomfortable and clammy, and even frostbite and freezing to death.
[0003] At present, the research on waterproof and moisture-permeable materials mainly includes the following types: TPU (thermoplastic polyurethane elastomer) waterproof and moisture-permeable membrane, which is a homogeneous and non-porous film, which uses polyurethane elastomer with hydrophilic groups TPU is the main material, with good moisture permeability and low price, but the disadvantage is that this kind of film has a low melting point, and the water-repellent processing performance after compounding is not good.
It has high moisture permeability and good air permeability, but the production price of the film is high. After long-term wearing and washing, the film will soon lose its waterproofness, and PTFE is difficult to decompose. There have been debates about its environmental protection

Method used

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  • A waterproof and moisture-permeable film and its preparation method and application
  • A waterproof and moisture-permeable film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Add 8 parts by mass of polyethylene glycol (molecular weight: 2000) into a three-necked flask to 100°C and vacuumize to -0.1MPa, then dehydrate at 110°C for 2 hours, then pass in nitrogen and cool to 70°C , add 17 mass parts of solvent N, N-dimethylformamide, stir evenly, and the stirring rate is 280 rpm;

[0034] (2) Then add 40 parts by mass of diphenylmethane 4,4'-diisocyanate into a three-necked flask, and react for 2 hours at a temperature of 50°C;

[0035] (3) Add 0.5 parts by mass of 1,4-butanediol and dimethylolpropionic acid of 0.5 parts by mass, stir evenly, the stirring speed is 250 rpm, after chain extension reaction for 1.5h, add 0.5 parts by mass of three Ethylamine, neutralize at 50°C for 0.5h, and finally use the solvent N,N-dimethylformamide to control the solid content of the system to 20%;

[0036] (4) Vacuumize the obtained film to remove the solvent N,N-dimethylformamide, the vacuum degree is -0.05MPa, then pour it into a petri dish, level it t...

Embodiment 2

[0038] (1) Add 30 parts by mass of polyethylene glycol into a three-necked flask to 100°C and vacuumize to -0.1MPa, dehydrate at 115°C for 2 hours, then pass in nitrogen, cool to 70°C, and add 50 parts by mass The solvent N, N-dimethylformamide, stir evenly, and the stirring rate is 300 rpm;

[0039] (2) Then add 30 parts by mass of diphenylmethane 4,4'-diisocyanate into the three-necked flask, and react for 4 hours at a temperature of 80°C;

[0040] (3) Add 1.0 parts by mass of 1,4-butanediol and 1.0 parts by mass of dimethylol propionic acid, stir evenly, the stirring speed is 280 rpm, after 2 hours of chain extension reaction; add 1 mass part of triethyl Amine, neutralization reaction at 55°C for 1 hour, and finally use the solvent N,N-dimethylformamide to control the solid content of the system to 30%;

[0041] (4) Vacuumize the obtained film to remove the solvent N,N-dimethylformamide, the vacuum degree is -0.05MPa, then pour it into a petri dish, level it to form a film...

Embodiment 3

[0043] (1) Add 50 parts by mass of polyethylene glycol into a three-necked flask to 100°C and vacuumize to -0.1MPa, dehydrate at 120°C for 2 hours, then pass in nitrogen, cool to 70°C, and add 80 parts by mass The solvent N, N-dimethylformamide, stir evenly, and the stirring rate is 350 rpm;

[0044] (2) Then add 10 parts by mass of diphenylmethane 4,4'-diisocyanate to the three-necked flask, and react for 6 hours at a temperature of 80°C;

[0045] (3) Add 1.5 parts by mass of 1,4-butanediol and dimethylol propionic acid of 1.5 parts by mass, stir evenly, the stirring speed is 300 rpm, after chain extension reaction for 2.5h; add 2 parts by mass of three Ethylamine, neutralize at 60°C for 1.0h, and finally use the solvent N,N-dimethylformamide to control the solid content of the system to 40%;

[0046] (4) Vacuumize the obtained film to remove the solvent N,N-dimethylformamide, the vacuum degree is -0.05MPa, then pour it into a petri dish, level it to form a film, and then pu...

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Abstract

The invention belongs to the field of polymer materials, and relates to a thin film and its preparation method and application. The film is made of the following components by mass: polyethylene glycol 8-50 parts, diphenylmethane 4, 4'-diisocyanate 10-40 parts, salt-forming agent 0.5-2 parts, chain extender 1 -5 servings. Compared with the prior art, the film of the present invention has better moisture permeability, and has better moisture permeability in the temperature range of 25-40°C, which is close to the active temperature range of the human body; the softness and hardness can also be adjusted according to needs. The ratio of segment molecular weight, and then change the softness and moisture permeability of the film. In addition, compared with traditional cotton, wool and other thermal insulation materials, the present invention has the advantages of waterproof, moisture permeability, windproof, and warmth retention. It can be coated or laminated. It is then used as high-end clothing, protective clothing, tents, moisture-proof pads and other products.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a thin film and its preparation method and application. Background technique [0002] In recent years, with the vigorous development of outdoor sports such as mountaineering, skiing, and sailing, as well as the special needs of some powerful departments for clothing materials, there is a strong demand for clothing materials with good waterproof and moisture-permeable functions. Waterproof, moisture permeable, windproof and warm in one, it can not only resist the invasion of rain, snow and cold wind, but also allow the sweat of the human body to be discharged in time to keep dry and warm, so as to realize the unity of waterproof function and comfort of the fabric. However, traditional fabrics are airtight and feel stuffy when worn. The sweat produced by the human body cannot be drained out of the clothing, and condensation accumulates on the inner surface of the clothing, making peo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/10C08L75/08C08J5/18
Inventor 于建美
Owner 拉萨经济技术开发区美第意户外用品有限公司
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