Polyurethane catalyst is an auxiliary agent that accelerates the polyurethane reaction. agent.
About classification: According to their chemical structural formula types, they can be basically divided into two categories: 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 are generally used in In the production of polyurethane foam, it is mainly divided into the following categories:
1. Aliphatic amine catalysts include N,N-dimethylcyclohexylamine, Bis(2-dimethylaminoethyl) ether, N,N,N’,N’-tetramethylalkylenediamine, triethylamine, N,N-dimethylbenzylamine, etc.
2. Alicyclic amine catalysts include solid amine, N-ethylmorpholine, N-methylmorpholine, N,N’-diethyl Piperazine etc.
3. Alcohol compound catalysts include triethanolamine, DMEA, etc.
4. Aromatic amines include pyridine, N,N’-lutidine, etc.
Organometallic catalysts: Polyurethane catalysts elastomers and 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.
The above is the editor’s introduction to the classification of polyurethane catalysts. For more questions about polyurethane catalysts, please feel free to consult.
