Rigid polyurethane foam, referred to as rigid polyureth […]
Rigid polyurethane foam, referred to as rigid polyurethane foam, is second only to flexible polyurethane foam in the amount of polyurethane products. The rigid polyurethane foam in PMI foam is mostly closed-cell structure, which has good thermal insulation effect, light weight, high specific strength, convenient construction and other excellent characteristics. At the same time, it also has the characteristics of sound insulation, shockproof, electrical insulation, heat resistance, cold resistance, solvent resistance, etc. The high temperature resistant foam.
Among all kinds of polyurethane products, polyurethane foam is the most important part. Its main feature is its porosity, so its relative density is low and its specific strength is high. According to different raw materials and formula changes, it can be made into soft, semi-rigid and rigid polyurethane foams; if classified according to the polyols used, it can be divided into polyester, polyether and castor oil polyurethane foams. Plastic etc.
According to its foaming method, it can be classified into block, molded and sprayed polyurethane foam. Rigid polyurethane foam is generally foamed at room temperature, and the molding process is relatively simple. According to the degree of construction mechanization, it can be divided into manual foaming and mechanical foaming; according to the foaming pressure, it can be divided into high-pressure foaming and low-pressure foaming; according to the molding method, it can be divided into pouring foaming and spraying foaming.