Environment-friendly high-performance quickly de-molding polyurethane reaction injection molding compound and preparation method of self-catalyzed chain extender thereof

Abstract

The invention discloses an environment-friendly high-performance quickly de-molding polyurethane reaction injection molding compound and a preparation method of a self-catalyzed chain extender thereof. The compound is prepared from two components. The component A is prepared from 1 to 10 percent of self-catalyzed chain extender and 0.01 to 2 percent of composite catalyst, wherein the self-catalyzed chain extender is the matter with the following structure shown in the description, in the formula, x is equal to 2 to 5, R is CyH2y+1, and y is equal to 0 to 2; and the composite catalyst is prepared from 10 parts of bismuth isooctanoate, 1 to 2 parts of potassium isooctanoate, 15 parts of bicyclic amidine compound and 10 parts of glycerol. The component B is prepared from 60 to 95 percent of MDI (diphenylmethane diisocyanate), 5 to 40 percent of modifier and 23 to 28 percent of NCO (isocyanate), wherein the modifier is prepared from at least one dihydric alcohol and at least one triatomic alcohol. The preparation method of the self-catalyzed chain extender comprises the following steps of heating piperazine to 65+ / -5 DEG C, at a temperature constant state, slowly dropping one of ethylene oxide, propylene epoxide or epoxybutane into a reaction vessel according to molar ratio, after dropping is finished, increasing the temperature to 80 to 85 DEG C to react for 4 hours, cooling, and discharging materials. The compound is low in odor, low in VOC (volatile organic compounds), good in weather resistance and short in de-molding time.

Description

technical field [0001] The invention relates to a polyurethane reaction injection molding material and a preparation process. Background technique [0002] Polyurethane Reactive Injection Molding (PU-RIM) materials are widely used in automobiles, and they are mainly divided into interior parts and exterior parts in terms of application parts. The materials in the cockpit of the car belong to interior parts, such as car seat foam, which have extremely strict requirements on the environmental performance of materials such as odor level and volatile organic compound content; the parts outside the cockpit are automotive exteriors Components, such as skylights, large surrounds, etc., have stricter requirements on the light aging performance of materials, and relatively lower requirements on environmental protection performance. However, with the continuous upgrading of products and the continuous improvement of product requirements, many products have put forward double high req...

AI Technical Summary

Problems solved by technology

This method can realize higher production efficiency, but because contain a certain amount of solvent in the composite catalyst, as acetone, 1,4-dioxane, xylene or ethyl acetate, and this composite catalyst is in composition system The proportion is relatively large, and the odor level and VOC of the material are difficult to meet the environmental protection performance requirements of its application field

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