Preparation method and application of polyurethane/polypropylene foam composite material

Abstract

The invention discloses a preparation method and application of a polyurethane / polypropylene foam composite material. The preparation method comprises the following steps: forming a polyurethane surface layer; the polyether polyol combined material A is prepared from the following components in parts by weight: 100 to 150 parts of polyether polyol, 20 to 60 parts of filler, 0.2 to 0.4 part of a rear-section curing catalyst and 0.05 to 0.15 part of an equilibrium catalyst; a polypropylene foam body is attached to the surface of the solvent-free polyurethane bonding layer, and a semi-finished product is obtained; and forming a surface treatment layer on the surface of the semi-finished product to prepare the polyurethane / polypropylene foam composite material. Through a special solvent-free cross-linked structure, the solvent-free polyurethane bonding layer and the PP foam body are firmly bonded, so that on the basis that the odor is reduced and the light weight is realized, excellent bonding performance is achieved, and the requirements of automobile interior foam type composite materials are met.

Description

technical field [0001] The invention belongs to the technical field of polyurethane composite materials, in particular to a method for preparing a polyurethane / polypropylene foam composite material, and also relates to the application of the polyurethane / polypropylene foam composite material prepared by the preparation method in automotive interior decoration. Background technique [0002] Automotive interiors generally require a foam-type composite material to meet the needs of daily use. In the current industry, PVC or PU polyurethane skin and polyurethane sponge are mostly prepared by flame compounding process, but when flame compounding, because the surface of the sponge needs to be melted, the combustion will be incomplete, and the initial decomposition will generate isocyanate and polyol, and then further decompose It is water, carbon dioxide and other volatile organic compounds (VOC). Although most of the VOC will volatilize in the subsequent process, it is still poss...

AI Technical Summary

Problems solved by technology

In the current industry, PVC or PU polyurethane skin and polyurethane sponge are mostly prepared by flame compounding process, but when flame compounding, because the surface of the sponge needs to be melted, the combustion will be incomplete, and the initial decomposition will generate isocyanate and polyol, and then further decompose It is water, carbon dioxide and other volatile organic compounds (VOC). Although most of the VOC will volatilize in the subsequent process, it may still be incompletely volatilized, resulting in an unpleasant smell and excessive VOC in the entire composite material.

[0003] In view of the above problems, the existing method is to compound PU and PP layers to obtain foam composite materials. Specifically, by setting PP medium glue between the base cloth layer of PU and the PP layer, it is possible to avoid the need for flame compounding to burn This leads to the problem of VOC exceeding the standard. Due to the base cloth and medium glue, on the one hand, the glue also has the problem of odor and VOC release; on the other hand, it increases the weight of the composite material, which does not meet the current trend of lightweight materials; but If the combination of base cloth and medium glue is not used, although the traditional solvent-free adhesive layer also has a certain adhesive ability, due to the particularity of the PP layer material, the adhesive performance between the two cannot meet the use requirements.

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