The application range of heat-resistant foam is very wide, and it has almost penetrated into all sectors of the national economy, especially in furniture, bedding, transportation, refrigeration, construction, heat insulation and other sectors. It is widely used and has become one of the indispensable materials. Polyurethane foam has excellent physical and mechanical properties, acoustic properties, electrical properties and chemical resistance. In particular, rigid polyurethane foam has a particularly low thermal conductivity and is a high-quality thermal insulation and cold preservation material.
The density and hardness of polyurethane foam can be changed with different raw materials and formulations. In addition, in terms of molding construction, other plastics cannot be compared with it. Unlike polymers such as polyethylene and polyvinyl chloride, monomers need to be polymerized into pellets before they can be processed into products. Polyurethane is directly processed from monomer raw materials into polymer products at one time, which eliminates the need for intermediate processes such as polymerization, separation, refining, and extrusion into pellets.
During the synthesis of polyurethane, the chemical structure, specification, variety and other adjustment formula combinations of raw materials can be adjusted to produce terminal products with various properties and uses, such as electrical conductivity, magnetic permeability, high temperature resistance, low temperature resistance, abrasion resistance, flame retardant, high Rebound, slow resilience, high density, low density, reticulated foam, hydrophilic foam and other products can meet various technical requirements put forward by various industrial fields in the national economy.
For a long time, the application of polyurethane foam has been mainly used as a liner and thermal insulation material. The current trend is to continuously expand the application area. In order to save energy in buildings, the Ministry of Construction has promulgated energy-saving measures that require the use of new thermal insulation materials. Polyurethane foam sandwich materials are one of the main varieties to be promoted, which will further expand the development of polyurethane foam materials.
