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Polyurethane waterproof moisture-permeable film and preparation method thereof

A polyurethane waterproof, waterproof and moisture-permeable membrane technology, which is applied in the field of waterproof and moisture-permeable membrane materials, can solve the problems of small pore size of waterproof and moisture-permeable membranes, and achieve the effects of improving mechanical strength, good compatibility, and enhancing moisture absorption performance

Active Publication Date: 2020-04-17
ZHEJIANG HUAFON SYNTHETIC RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention has a certain degree of innovation in terms of environmental protection, but the waterproof and moisture-permeable membrane prepared by this method has a relatively small pore size, and the relevant performance can only meet the requirements of ordinary clothing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The preparation method of described titanium dioxide porous microsphere is as follows:

[0033] A certain amount of cellulose triacetate was dissolved in dimethylacetamide, and magnetically stirred at 60° C. for 1 h until uniform. Dissolve a certain amount of tetrabutyl titanate in a mixed solution of dimethylacetamide and glacial acetic acid, and stir magnetically at 25° C. for 1 h until uniform. The above solutions were mixed, stirred at room temperature for 3 hours, and then placed in an oven at -10°C for 30 minutes. A large amount of ethanol was added to the solution to extract dimethylacetamide and glacial acetic acid, and the extraction was continued for 5 times. The remaining samples were freeze-dried for 48 hours to obtain triacetate cellulose / titanium dioxide composite porous microspheres. The composite porous microspheres were hydrolyzed in a certain amount of 0.5% NaOH ethanol solution for 24 hours, then washed with distilled water until neutral, and vacuum...

Embodiment 1

[0042]The polyurethane waterproof and moisture-permeable membrane is mainly made of the following components: 25 parts of polyurethane resin, 72 parts of organic solvent, 2 parts of pore-forming agent, and 1 part of inorganic filler.

[0043] Described polyurethane resin adopts the JF-S-WV7025 model product of Zhejiang Huafeng Synthetic Resin Co., Ltd.;

[0044] The raw material of the polyurethane resin includes polypolyol, and polyethylene glycol accounts for 20% of the mass of the polypolyol;

[0045] The organic solvent is a mixed solution of N,N-dimethylformamide, ethyl acetate and dimethyl carbonate, with a mass ratio of 6:3:1;

[0046] The pore-forming agent is titanium dioxide, alumina, zirconia porous microspheres, the molar ratio of substances is 5:3:2, and the average pore diameter is 15 μm;

[0047] Described inorganic filler adopts silane coupling agent to modify inorganic filler, and described inorganic filler is organic montmorillonite, kaolin, carbon nanotube,...

Embodiment 2

[0053] The polyurethane waterproof and moisture-permeable membrane is mainly made of the following components: 25 parts of polyurethane resin, 74 parts of organic solvent, 0.5 part of pore forming agent, and 0.5 part of inorganic filler.

[0054] Described polyurethane resin adopts the JF-S-WV7025 model product of Zhejiang Huafeng Synthetic Resin Co., Ltd.;

[0055] The raw material of the polyurethane resin includes polypolyol, and polyethylene glycol accounts for 20% of the mass of the polypolyol;

[0056] The organic solvent is a mixed solution of N,N-dimethylformamide, ethyl acetate and dimethyl carbonate, with a mass ratio of 6:3:1;

[0057] The pore-forming agent is porous microspheres of titanium dioxide, alumina, and zirconia, the molar ratio of substances is 5:3:2, and the average pore diameter is 1 μm;

[0058] Described inorganic filler adopts silane coupling agent to modify inorganic filler, and described inorganic filler is organic montmorillonite, kaolin, carbon...

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Abstract

The invention discloses a polyurethane waterproof moisture-permeable film and a preparation method thereof. The polyurethane waterproof moisture-permeable film is prepared from the following raw materials in parts by weight: 25-45 parts of polyurethane resin, 52-75 parts of an organic solvent, 0.5-2 parts of a pore-forming agent and 0.1-1 part of an inorganic filler. The method comprises the following steps: step 1, physical blending: adding a pore-forming agent into a polyurethane resin solution, stirring, adding the inorganic filler, continuously stirring, adding the organic solvent, uniformly stirring, and cooling to obtain a mixed solution; and 2, preparing a film, namely pouring the mixed solution obtained in the step 1 onto a planar medium, scraping a film on the planar medium by using a scraping tool, and drying to form a film, thereby obtaining the polyurethane waterproof moisture-permeable film. According to the invention, the problem of poor performance of a commercially aviable waterproof and moisture permeable film can be solved, the moisture permeability and the water pressure resistance of the polyurethane waterproof moisture-permeable film are effectively improved, the waterproof and moisture permeable performance of the polyurethane waterproof moisture-permeable film can be regulated and controlled, and the breaking strength, the elongation at break and other mechanical strength are excellent.

Description

technical field [0001] The invention relates to a polyurethane waterproof and moisture-permeable membrane and a preparation method thereof, belonging to the technical field of waterproof and moisture-permeable membrane materials. Background technique [0002] In order to meet people's consumption needs, there are more and more types of functional clothing on the market, and waterproof and moisture permeability is one of the important functions. In order to realize the waterproof and moisture-permeable properties of clothing, the current market generally adopts laminating fabrics with waterproof and moisture-permeable polyurethane films. [0003] There are two main types of polyurethane waterproof and moisture-permeable membranes: microporous waterproof and moisture-permeable membranes and dense waterproof and moisture-permeable membranes. A large number of micropores with a diameter of 2-20 μm are distributed on the surface of the microporous waterproof and moisture-permeab...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L75/06C08K13/06C08K9/06C08K3/34C08K3/04C08K7/24C08J5/18
CPCC08J5/18C08J2375/06C08J2375/08C08K3/04C08K3/346C08K7/24C08K9/06C08K13/06C08K3/041
Inventor 方飞张初银韩飞龙孙凡杜飘扬岑小春
Owner ZHEJIANG HUAFON SYNTHETIC RESIN
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