Polyurethane is the reaction product of polyols (including diols) and polyisocyanates (including diisocyanates).

The two main raw materials, organic polyisocyanates and oligomer polyols (such as polyether, polyester, etc.), usually account for more than 80% of the weight of polyurethane products (excluding solvents). Although the amount of additives is small, it is also an important raw material for polyurethane materials. The development of main raw materials and additives has promoted the development of new polyurethane materials.

Compared with other synthetic resins, polyurethane resin has a wide variety of raw materials, which leads to the diversification and wide application of polyurethane materials. This is a major feature of polyurethane resin. There are many varieties of polyisocyanates and oligomer polyols, and there are even more additives. In terms of functions, the additives include catalysts, chain extenders, cross-linking agents (curing agents), flame retardants, foaming agents, and foams. Stabilizers, antioxidants, UV absorbers, anti-hydrolysis agents, bactericidal (anti-mildew) agents, coupling agents, primers, antistatic agents, rheological additives and thickeners, leveling agents, wetting and dispersing agents Agents, pigments and color pastes, water removers, modified monomers and resins, release agents, etc., some of which can be divided into several subcategories; raw material additives also have many chemical components, including diisocyanates and polyisocyanates. , polyether polyols, polyester polyols, small molecule diols and triols, aromatic diamines, modified silicones, halogenated hydrocarbons, phosphate esters, hindered amines, hindered phenols, tertiary amines, organic metal compounds, Carbodiimide, alkylene oxide, carbonate, lactone, etc.