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Water proof and moisture permeable material, thin film and fabric

A waterproof and moisture-permeable, thin-film technology, applied in the direction of layered products, etc.

Inactive Publication Date: 2008-12-31
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are quite a lot of patents on moisture-permeable and waterproof polyurethane, among which the literature on modification of external additives or post-processing methods accounts for the majority, but patents on pure raw material formulas are rare

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Design a formula with a weight ratio of polyester polyol / polyether polyol of 0.36 to synthesize polyurethane: polyethylene glycol (PEG2000) with a mole fraction of 0.11 and a poly-1,4-butanediol adipate with a mole fraction of 0.04 Ester (PBA2000) and 1,4-butanediol (1,4-BD) with a mole fraction of 0.35 were mixed at 70°C and stirred uniformly, and then 4,4-diphenylmethane diisocyanate with a mole fraction of 0.50 ( MDI) was added and the reaction was stirred rapidly. After the reaction temperature reaches 120°C, the composition is poured out to cool and placed in an oven at 80°C to mature for one day to obtain the moisture-permeable thermoplastic polyurethane. It has good film-forming properties, elongation rate of more than 700%, and moisture permeability of 13,000g / m 2 / D.

Embodiment 2

[0037] Design a formula with a weight ratio of polyester polyol / polyether polyol of 1.0 to synthesize polyurethane: polyethylene glycol (PEG2000) with a mole fraction of 0.06 and a poly-1,4-butanediol adipic acid with a mole fraction of 0.06 Ester (PBA2000) and 1,4-butanediol (1,4-BD) with a mole fraction of 0.38 were mixed and stirred at 70°C, and then 4,4-diphenylmethane diisocyanate with a mole fraction of 0.50 ( MDI) was added and the reaction was stirred rapidly. After the reaction temperature reaches 120°C, the composition is poured out to cool and placed in an oven at 80°C to mature for one day to obtain the moisture-permeable thermoplastic polyurethane. It has good film-forming properties, elongation of 550% or more, and moisture permeability of 2,600g / m 2 / D.

Embodiment 3

[0039] In this embodiment, the thickness of the waterproof and moisture-permeable film obtained by blown film processing is 15 μm, and the set blow-up ratio is 2.0. The film composition formula includes 95 wt% of thermoplastic polyurethane, 5 wt% of low density polyethylene and 1,000 ppm of anti-blocking agent. The ratio of polyurethane hard segment to soft segment is 0.61, and the polyethylene density is 0.923g / cc. The physical properties of the film are as follows, the moisture permeability is 2,854g / m 2 / day, elastic recovery rate is 89%, elongation rate is 730%.

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Abstract

The invention provides a waterproof moisture-permeable polyurethane and a film made of the waterproof moisture-permeable polyurethane. The film contains 90-99wt% polyurethane and 1-10wt% polyethylene. The invention further provides a fabric which contains the film.

Description

Technical field [0001] The invention relates to a polymer material, in particular to a waterproof and moisture-permeable film and fabrics containing the film. Background technique [0002] Thermoplastic polyurethane (TPU) is a kind of high tensile strength and soft elastomer synthetic resin, which has the characteristics of abrasion resistance, low temperature resistance, no cracking, and resistance to falling off the surface of the attached object. Its processing does not use solvents and is decomposable, meets environmental protection requirements, and has a wide range of uses, especially in the processing and bonding of textiles and garments. In terms of film processing, in order to achieve a lower thickness (<20 μm) and better uniformity (accuracy ±15%), blown film processing is usually used. [0003] Due to the high friction on the surface of the polyurethane, in the process of film curling and flattening, the problem of film blocking is often encountered, which causes fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/42C08J5/18C08L75/08C08L23/06B32B5/24B32B7/12
Inventor 龚丹诚陈联泰陈瑞鑫
Owner IND TECH RES INST