Preparation method of polyurethane microporous membrane

Abstract

The invention discloses a preparation method of a polyurethane microporous membrane, which comprises the following steps: (1) uniformly stirring the following components in parts by mass to form a coating emulsion: 90-100 parts of W / O polyurethane resin, 10-20 parts of hydrophilic polyurethane resin, 15-30 parts of toluene, 25-35 parts of methylethylketone, 10-20 parts of pore-forming agent, 1-2 parts of crosslinking agent, 0.2-1.0 part of releasing agent, 0.2-1.0 part of anti-skinning agent, 0.5-1.5 parts of leveling agent, 1-3 parts of water-sprinkling agent, 40-60 parts of deionized water and 1-10 parts of color paste; and (2) coating the coating emulsion to a transfer carrier, drying, and peeling to obtain the polyurethane microporous membrane. The polyurethane microporous membrane prepared by the preparation method has the functions of windproofness and ventilation and the function of actively absorbing moisture and discharging sweat, and is applicable to different clothing facing materials.

Description

technical field [0001] The invention relates to a preparation method of polyurethane microporous film. Background technique [0002] With the progress of society, the vigorous development of outdoor sports and the improvement of people's living standards, people not only have requirements for clothing styles, fabrics and other external aspects, but also pay more and more attention to some internal quality and functionality. The combination of windproof, breathable, moisture-absorbing and sweat-conducting materials with textile fabrics will greatly expand the application of some textile fabrics, such as down jackets, morning exercise clothes, thermal underwear, windbreakers, etc. There is a wide range of demand. Some people have used ordinary plastic films (such as polyethylene, polypropylene, polyvinyl chloride) to punch holes to produce some breathable films for composite applications of textile fabrics. This approach has the following disadvantages: ①Due to the relatively...

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Problems solved by technology

This approach has the following disadvantages: ①Due to the relatively large hole diameter, usually around 0.1mm, the windproof performance is poor. In places where the outdoor wind is strong, because it cannot block the intrusion of cold wind, the warmth retention is not good, which limits its application; ② It is not a non-hydrophilic material, so it does not have the function of actively absorbing moisture and sweating; ③The hand feels bad, and the fabric feels plastic after compounding; ④The cold resistance is not good, and it will become hard and brittle in cold conditions (below -20°C). ; ⑤ can not be naturally degraded, does not meet the current environmental protection requirements

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