Polyurethane modified polylol and polyurethane foam plastic prepared from polyurethane modified polylol

Abstract

The invention discloses polyurethane modified polylol, which is prepared from the following ingredients in parts by weight: 100 parts of polyalcohol, 1.0 to 8.0 parts of chain extending agents, 0.1 to0.3 part of catalysts and 2.0 to 20.0 parts of diisocyanate. The invention also discloses polyurethane foam which is prepared from the polyurethane modified polylol and has the shrinkage rate and themechanical strength. The novel polyurethane modified polylol has the advantages that the polyurethane foam prepared from the polyurethane modified polylol has the advantages of high pore rate, low shrinkage rate and fine dimension of the prepared finished product, simultaneously has high mechanical strength, and solves the problems that the existing polyurethane foam is difficult to simultaneously consider the shrinkage rate and the mechanical strength; the application prospects are very good.

Description

technical field [0001] The invention relates to a polyurethane modified polyol and a polyurethane foam prepared therefrom. Background technique [0002] Polyurethane foam plastics, with the increase of molecular chain cross-linking density, that is, the decrease of molecular weight (Mc) between cross-linking points, the foam mechanical properties increase rapidly, while the elongation, compression set and swelling in solvent decrease rapidly . According to the Mc classification of foam, polyurethane foam can be divided into soft, semi-rigid and rigid foam. Among them, rigid foam is a fully closed-cell foam with relatively high mechanical strength, but its resilience is poor; soft foam has good resilience, but low mechanical strength; semi-rigid foam is a transition from soft foam to hard foam. The intermediate product has the advantages of both, it has certain mechanical strength and certain resilience, so its application range is wider, and it is widely used in automobile...

AI Technical Summary

Problems solved by technology

A low open cell ratio will lead to shrinkage during the preparation of polyurethane foam, which will affect the finished product, and usually a high open cell ratio will lead to a decrease in mechanical strength

Therefore, it is currently difficult to prepare semi-rigid foams with high porosity and relatively high mechanical strength.

For example, the patent application with publication number CN102336900A provides a polyether polyol or polyether polyester as a cell opener for slow resilience polyurethane foam, which improves the open cell ratio, but has the problem of low mechanical strength

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