Classification of polyurethane catalysts
The catalysts commonly used in the synthesis of polyurethane and its raw materials mainly include tertiary amine catalysts (including their quaternary ammonium salts) and organometallic compounds. There are many kinds of tertiary amines and organometallic compounds. Considering various factors, there are only more than 20 most commonly used in polyurethane production.
Amine catalysts
Amine catalysts are generally used in the production of polyurethane foam, mainly divided into the following categories:
Aliphatic amine catalysts are N,N-Dimethylcyclohexylamine, bis(2-dimethylaminoethyl)ether, N,N,N’,N’-tetramethylalkylenediamine, triethylamine, N,N- Dimethylbenzylamine, etc.
Alicyclic amine catalysts include solid amine, N-ethylmorpholine, N-methylmorpholine, N,N’-diethylpiperazine, etc.
Alcohol compound catalysts include triethanolamine, DMEA, etc.
Aromatic amines include pyridine, N,N’-lutidine, etc.
Organometallic catalyst
In polyurethane elastomers and adhesives, coatings, sealants, waterproof coatings, paving materials and other formulations, organic metals such as dibutyltin dilaurate Catalyst is the most commonly used, it is very effective in promoting the reaction between isocyanate groups and hydroxyl groups, but it also has a certain acceleration effect on the reaction of water and isocyanate in formulas with moisture, and it is suspicious that organic lead and other special catalysts can be used in formulas such as plastic track [1 ].
Organometallic compounds include carboxylates, metal alkyl compounds, etc. The metal elements contained mainly include tin, potassium, lead, mercury, zinc, etc., and the most commonly used are organotin compounds.
Tag:   polyurethane catalyst amine catalyst organometallic catalyst
