Polyurethane catalyst is an additive that accelerates the polyurethane reaction.
The catalysts commonly used in the synthesis of polyurethane and its raw materials mainly include tertiary amine catalysts and organometallic compounds. There are many kinds of tertiary amines and organometallic compounds. Considering various factors, there are only more than 20 types most commonly used in polyurethane production.
Amine catalysts
Amine catalysts are generally used in the production of polyurethane foams Among them, they are mainly divided into the following categories:
Aliphatic amine catalysts include N,N-dimethylcyclohexylamine, bis(2-dimethyl Aminoethyl) ether, N,N,N’,N’-tetramethylalkylenediamine, triethylamine, N,N-dimethylbenzylamine, etc.
Alicyclic amine catalysts include solid amines, N-ethylmorpholine, N-methylmorpholine, and N,N’-diethyl Piperazine etc.
Alcohol compound catalysts include triethanolamine, DMEA, etc.
Aromatic amines include pyridine, N, N’-dimethylpyridine, etc.
Organometallic catalysts
In polyurethane elastomers, adhesives, coatings, In formulas such as sealants, waterproof coatings, and paving materials, organometallic catalysts such as dibutyltin dilaurate (DY-12) are most commonly used. They are very effective in promoting the reaction between isocyanate groups and hydroxyl groups. However, in formulas containing moisture, The reaction between water and isocyanate also has a certain acceleration effect. Special catalysts such as organic lead can be used in formulas such as plastic runways.
Organometallic compounds include carboxylates, metal alkyl compounds, etc. The main metal elements contained are tin, potassium, lead, mercury, zinc, etc. The most commonly used are organotin compounds.
Commonly used varieties
DY-1 (bis dimethylaminoethyl ether) , DY-5 (pentamethyldiethylenetriamine), DY-8 (dimethylcyclohexylamine), DY-12 (dibutyltin dilaurate), DY-20 (Organobismuth), DY-41 (triazine trimerization catalyst), etc.
Storage
Dry and sealed storage
