The catalysts commonly used in the synthesis of polyurethane its raw materials are tertiary amine catalyst organometallic compound. There are many kinds of tertiary amines organometallic compounds. Considering various factors, only more than 20 kinds of tertiary amines organometallic compounds are commonly used in polyurethane production.
Amine catalysts are commonly used in the production of polyurethane foam, which are mainly divided into the following categories:
Aliphatic amine catalysts include n, n-dimethylcyclohexylamine, bis (2-dimethylaminoethyl) ether, N, N, n ', n' - TETRAMETHYLENEDIAMINE, triethylamine, N, n-dimethylbenzylamine, etc.
Alicyclic amine catalysts include solid amine, n-ethylmorpholine, N-Methylmorpholine, N, n '- diethylpiperazine, etc.
The catalysts of alcohols are triethanolamine, DMEA, etc.
Aromatic amines include pyridine, N, n '- dimethylpyridine, etc.
Among the polyurethane elastomers, adhesives, coatings, sealants, waterproof coatings, paving materials other formulations, dibutyltin dilaurate (dy-12) other organic metal catalysts are most commonly used. It is very effective to promote the reaction of isocyanate group hydroxyl group, but it can also accelerate the reaction of water isocyanate in the formula with water. It is doubtful that dy-12 can accelerate the reaction of water isocyanate in the formula with water Special organic catalysts such as lead can be used.
Organic metal compounds include carboxylates, metal alkyl compounds, etc. the metal elements mainly include tin, potassium, lead, mercury, zinc, etc., the most commonly used is organotin compounds.
DY-1 (BIS dimethylaminoethyl ether), DY-5 (pentamethyldiethylenetriamine), dy-8 (dimethylcyclohexylamine), dy-12 (dibutyltin dilaurate), dy-20 (organic bismuth), dy-41 (triazine trimerization catalyst), etc.
keep in storage
Dry sealed storage