Polyurethane self-skinning foam and preparation method thereof

Abstract

The invention relates to the technical field of high polymer materials, and particularly provides polyurethane self-skinning foam and a preparation method thereof. The polyurethane self-skinning foamis prepared from a cross-linking agent, a catalyst and isocyanate, and PO / EO copolyether polyol and methyl formate, wherein the molecular weight of the PO / EO copolyether polyol is 6000-12000, the primary hydroxyl group content is 70-85 percent, and the content of ethylene oxide is 10-20%; according to the invention, the adopted molecular weight is 6000-12000, the primary hydroxyl group content is70-85 percent, polyether polyol with ethylene oxide content of 10-20% and a foaming agent methyl formate are combined for use, a non-environment-friendly hydrochlorofluorocarbon foaming agent HCFC-141b can be replaced, the use amount of the foaming agent is reduced, the compatibility between materials can be improved, the surface density, tensile strength and tearing strength of the polyurethane self-skinning foam are improved, the density of the foam can be reduced, and the tensile strength and the tearing strength of the foam are improved so that the performances of the polyurethane self-skinning foam surface and the foam are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyurethane self-skinned foam and a preparation method thereof. Background technique [0002] Polyurethane self-skin foam (integral skin foam, referred to as ISF foam), also known as integral skin foam, is a product made of a dense skin layer with a certain thickness (0.3-3.0mm) and a foam inner core through a molding process. And the cross-sectional density gradually decreases from the skin to the inner core, showing an anti-parabolic shape, and the skin layer has a density similar to that of the polymer matrix material, 900-1200kg / m 3 , the lowest density at the center is close to dozens to hundreds of kg / m 3 , the skin layer has both beautiful appearance and mechanical properties comparable to olefin plastic leather. [0003] The preparation process and principle of polyurethane self-skin foam is: use the reaction heat generated by the reaction of polyol compone...

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Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome the serious pollution of using HCFC-141b blowing agent in the prior art, and the poor defect of the polyurethane self-skin foam formed, thereby providing a kind of polyurethane self-skin foam and its Preparation

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