A kind of polyurethane foaming agent with enhanced function and preparation method thereof

Abstract

The present invention relates to the technical field of polyurethane foaming agents, particularly to a polyurethane foaming agent having an enhancement function, and a preparation method thereof. According to the present invention, the polyurethane foaming agent is a capsule blowing agent formed from an ethyl cellulose capsule, water and inorganic crystal whiskers, wherein the water and the inorganic crystal whiskers are wrapped in the ethyl cellulose; when the polyurethane foaming agent is used for foaming polyurethane, the ethyl cellulose is slowly dissolved by an organic solvent, the inner core water contained in the ethyl cellulose is subjected to a reaction to produce foams, and further the inorganic crystal whiskers are uniformly dispersed in the polyurethane foams through foam expansion diffusion, such that the enhancement effect is provided, and the foaming rate can be controlled so as to achieve the controlled, uniform and stable polyurethane water foaming.

Description

technical field [0001] The invention relates to the technical field of polyurethane foaming agents, in particular to a polyurethane foaming agent with enhanced functions and a preparation method. Background technique [0002] Polyurethane (PU) foam is one of the most commonly used plastics at present. It is estimated that the global annual demand is about 5 million tons, most of which are polyurethane soft foam and hard foam. The PU foam material is extremely flammable in the air, and produces a large amount of toxic gas and smoke when burning. Therefore, foreign countries have paid great attention to the flame retardancy of PU foam materials, and promulgated many regulations and standards on flame retardancy. In my country, although there are no regulations on PU foam flame retardancy, in fact, in recent years, the polyurethane foam used in aircraft, ships, railway vehicles, automobiles, other important industry parts, equipment and some places has proposed regulations. Fl...

AI Technical Summary

Problems solved by technology

Above-mentioned two kinds of methods all adopt acidic reaction condition, the adding of acidic substance can reduce the stability of suspending agent silicon dioxide and influence the homogeneity and the dispersibility of microcapsule blowing agent

Moreover, the polymerization reaction under acidic conditions often causes the decomposition of some monomers such as vinylidene chloride, so that the formed microcapsule foaming agent product is relatively acidic (PH<4). The storage stability of the foamed resin composition prepared by the agent is low, and affects the performance

[0008] In practical engineering applications, technical indicators such as bending strength and impact strength of PUR foam cannot meet the requirements of use, which limits its wide application. Therefore, it needs to be enhanced and modified to make up for the shortage of materials and further improve its mechanical properties.

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