Processing Methods For Polyurethane Materials

                                              Processing-methods-for-polyurethane-materials

In recent years, the development of related technologies for polyurethane modification has become a research hotspot. The purpose is to make the modified polyurethane have better mechanical properties as well as heat resistance, chemical resistance and other properties, so that foam technology can be more widely used in the field of automotive parts manufacturing.

Polyurethane was first synthesized by German chemist Otto Bayer and his colleagues in 1936 during the study of the addition polymerization reaction process of isocyanates. The three major technological breakthroughs in the 20th century promoted the rapid development of industrial production of polyurethane. Polyurethane products can be widely used in various fields such as light industry, petrochemical industry, electromechanical industry, automobile industry, energy industry, military industry and construction industry.

Processing methods for polyurethane materials

The RIM polyurethane usually refers to RIM, RRIM (Reinforced Reaction Injection Molding), SRIM, MC-RIM, GRIM and RIRIM (Rotary Injection RIM).

RIM refers to the process of ordinary unreinforced materials; RRIM mainly refers to materials or processes prepared by reacting relatively short fibers or other reinforcing materials mixed with reaction materials; SRIM refers to continuous long fibers that are pre-placed in the cavity and then injected into the cavity through fiber pads. The material or process that reacts after passing through; MC-RIM refers to multi-component reaction injection molding, also called “multi-stage injection RIM”, that is, the materials for the skin and central parts are injected into the cavity successively; GRIM refers to thin-walled and hollow parts. This process can save about 40% of raw materials; RIRM is called rotary reaction injection molding. The characteristic of this technology is that there is no limit on the viscosity of the material. There are two injection methods: one is a rotary injection mixing method with a small hole as an injection port, and the other is a rotary plane jet mixing method with a gap as an injection port.