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Aperture-controllable micro-porous membrane and making method thereof

A technology of microporous membrane and pore size, which is applied in the field of microporous membrane with controllable pore size and its preparation, can solve the problems of difficulty in actual machine production, poor reproducibility, complicated production process, etc., and achieve the effect of excellent waterproof and moisture permeability effect.

Active Publication Date: 2017-06-20
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

③Dry film-making method. First, two solvents with different boiling points and solubility are evenly dispersed into the resin, and then heated to continuously volatilize the solvent. Among them, the low boiling point solvent gradually evaporates, so that the resin concentration increases and gradually condenses; , the high-boiling-point solvent is in a state of micro-gap dispersion, and the condensation process is carried out on the interface around the dispersed particles. When the high-boiling-point solvent is dried, countless pores will be formed. Similarly, this method is difficult to control the pore size, and the reproducibility is poor. Real machine production difficulty
④Calendering film-making method, extruding and forming molten TPU, TPE or PTFE, and then biaxially stretching the formed body horizontally and vertically to obtain a uniform microporous structure. The obtained microporous film has excellent strength and waterproof Moisture permeability, but the production process is complicated and the cost is high
This film-making method is more environmentally friendly, but because water-soluble polymers such as sodium carboxymethylcellulose, soluble starch, etc., have a particle size of more than 20 μm; control

Method used

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  • Aperture-controllable micro-porous membrane and making method thereof

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preparation example Construction

[0016] The preparation method of the microporous membrane with controllable pore size of the present invention comprises the following steps:

[0017] (1) Prepare coating resin processing fluid, at least including the following components:

[0018] 100 parts by weight of solvent-based polyurethane resin

[0019] Acid-soluble fine particles 5-60 parts by weight

[0020] The particle size of the acid-soluble microparticles used is 0.5-20 μm;

[0021] (2) Then apply the above-mentioned coating resin processing liquid to the surface of the release cloth or release paper to prepare a non-porous polyurethane resin film;

[0022] (3) Then put the above-mentioned non-porous polyurethane resin film into an acid aqueous solution for acid treatment;

[0023] (4) Finally wash with water to get the product.

[0024] Different types of acids may affect the stripping effect of acid-soluble microparticles. The acid used for acid treatment is preferably one of hydrochloric acid, nitric aci...

Embodiment 1

[0042] (1) Preparation of coating resin processing fluid:

[0043] 100 parts by weight of solvent-based polyether polyurethane resin

[0044] Magnesium hydroxide microparticles (2um) 20 parts by weight

[0045] 50 parts by weight of toluene

[0046] First, magnesium hydroxide is uniformly dispersed in toluene to obtain a mixed solution, and then the mixed solution is uniformly mixed with a solvent-based ether-type polyurethane resin to obtain a coating resin processing fluid;

[0047] (2) Next, on the coating machine, apply the above-mentioned coating resin processing fluid to the surface of the release cloth, and then dry it in a continuous drying oven (90°C → 130°C → 160°C) to form a film to obtain a 20μm-thick film. Porous polyether polyurethane resin film;

[0048] (3) Then, in the acid treatment tank, put the non-porous polyether polyurethane resin film prepared above into an aqueous acetic acid solution with a pH value of 3 for acid treatment at a temperature of 60°C ...

Embodiment 2

[0051] The particle size of the magnesium hydroxide microparticles used was 4 μm, and the rest were the same as in Example 1 to prepare a microporous resin film, the properties of which are shown in Table 1.

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Abstract

The invention discloses an aperture-controllable micro-porous membrane and a making method thereof. The micro-porous membrane is a polyurethane resin membrane, the aperture of the micro-porous membrane is 0.5-20 [mu]m, and the content of acid-soluble micro-particles in the membrane is 5.0 wt% or less. The acid-soluble micro-particles are used in coated resin, and are dissolved through acid treatment to obtain the aperture-controllable micro-porous membrane. The method is simple and easy, and the obtained micro-porous membrane has superior water pressure resistance, superior moisture permeability and soft hand feeling, can be used in outdoor sports wear, and has wide application prospect.

Description

technical field [0001] The invention belongs to the field of waterproof and moisture-permeable membranes, in particular to a microporous membrane with controllable pore size and a preparation method thereof. Background technique [0002] In order to cater to people's consumption needs, there are more and more types of functional clothing appearing on the market, and their functions are becoming stronger and stronger. The functions of commonly used fabrics include anti-wrinkle, antibacterial, mosquito repellent, anti-ultraviolet, pearlescent effect, radiation protection, waterproof and moisture-permeable. Among them, clothing fabrics with waterproof and moisture-permeable functions are being paid attention to by more and more people, and have been widely used Winter clothes, raincoats, mountaineering suits, ski suits and other sportswear and many other aspects. Generally speaking, there are two main methods commonly used to obtain the waterproof and moisture-permeable functi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26C08L75/04C08K3/22
CPCC08J5/18C08J9/26C08J2375/04C08K3/22C08K2003/2224C08L75/04
Inventor 邵兵刘春燕符晔二宫有希
Owner TORAY FIBER RES INST(CHINA) CO LTD
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