Combined polyol for polyisocyanurate foam

Abstract

The polyol composition for polyisocyanurate foam consists of: polyester polyols based on aromatic acid anhydride 40-70 wt%; polyethylene / propylene oxide polyether polyols based on fatty amine, fatty diamine or fatty polyamine 0-10 wt%; compound containing active hydrogen atom 0-25 wt%, liquid organic fire retardant 14-25 wt%, water 1-3 wt%, catalyst 2-4.5 wt%, and supplementary material and / or additives 2-5 wt%. The hard foam prepared through one-step process has homogeneous and fine cells, and has the excellent performances in electric insulation, light weight, sound isolation, chemical corrosion resistance, etc. similar to those of PUR foam as well as pressure strength, size stability, heat insulation, flame resistance, low burning smoke amount, etc. superior to PUR foam. The present invention may be used in heat insulating material and sandwiched composite material with relatively high temperature requirement.

Description

Technical field [0001] The present invention relates to a polyol used in the field of foam materials, in particular to a combined polyol for polyisocyanurate foam plastics. Background technique [0002] Since the method of producing rigid polyurethane foam by reacting organic isocyanate with combined polyols in the presence of a blowing agent was established, rigid polyurethane foam (PUR) has become a popular choice due to its low thermal conductivity, high specific strength, light weight, and chemical resistance. Characteristics, it has received more and more applications and attention in the fields of construction, thermal insulation, transportation, insulation and other materials. However, ordinary PUR rigid foam is easy to deform and its compressive strength will decrease if it is exposed to high temperature or severe cold environment for a long time, and its application range is limited. Moreover, as an organic polymer material, PUR rigid foam, like other organic subst...

AI Technical Summary

Problems solved by technology

However, the foam containing the above two types of flame retardants has obvious disadvantages, that is, once the foam is burned, the volatile phosphorus or halogen compound escapes into the fireworks, causing a large increase in smoke and accompanied by toxic and irritating gases.