Rigid polyurethane foams, referred to as rigid polyuret […]
Rigid polyurethane foams, referred to as rigid polyurethane foams, are used in polyurethane products second only to flexible polyurethane foams. Polyurethane rigid foam is mostly closed-cell structure, which has excellent characteristics such as good thermal insulation effect, light weight, high specific strength and convenient construction. It also has high temperature resistant foam with the characteristics of sound insulation, shock resistance, electrical insulation, heat resistance, cold resistance, and solvent resistance. .
Among all kinds of polyurethane products, polyurethane foam is an important part. Its main feature is its porosity, so its relative density is low and its specific strength is high. According to the different raw materials used in the PMI foam and the changes in the formula, it can be made into soft, semi-rigid and rigid polyurethane foams; if classified according to the types of polyols used, it can be divided into polyester type, polyether type and castor oil type. Polyurethane foam, 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. As a high-performance sandwich material, PMI foam, PMI (polymethacrylimide) high-performance lightweight rigid foam, has excellent mechanical and technological properties, and can be widely used in various composite parts.