How to deal with the problem of slow foaming and curing of polyurethane products

Through the use of latent curing agent, many problems existing in polyurethane industry, such as bubbles, slow curing speed and difficult adjustment of mechanical properties, have been successfully solved, which provides a reliable guarantee for developing high-quality polyurethane products.

Polyurethane is called polyurethane, which is the general name of macromolecular compounds with repeated carbamate groups in the main chain. It is formed by addition polymerization of organic diisocyanate or polyisocyanate with dihydroxy or polyhydroxy compounds. Polyurethane materials are widely used and can replace rubber, plastic and nylon. , can be used in airports, hotels, building materials, automobile factories, coal mines, cement plants, senior apartments, villas, landscaping, painted stone art, parks and so on.

Plastic foaming technology has a long history. The earliest is the foam bakelite in the early 1920s, which was made by a method similar to foam rubber. Rigid polyurethane foam and polystyrene foam appeared in 1930s. In the 1940s, there were polyethylene, polyvinyl chloride, epoxy resin and phenolic foam. In 1950s, there were expandable polystyrene foam and flexible polyurethane foam. Basically all plastics, including thermoplastics and thermosetting plastics, can be foamed into foam. Industrial preparation methods include extrusion foaming, injection foaming, molding foaming, calendering foaming, powder foaming and spray foaming. Among them, injection foaming is one of the most important molding methods, and this paper focuses on injection foaming.