Catalysts are the accelerators of many chemical reactions. Catalyst is an important additive for synthetic resins, and polyurethane is no exception. Polyurethane catalystShorten reaction time, improve production efficiency, selectively promote positive reactions and inhibit side reactions. In the production of many polyurethane products, catalyst is a commonly used additive. Although the dosage is small, it has a great effect.
Although a small amount of inorganic salt compounds, organic phosphorus oxide compounds, etc. can be used as catalysts for polyurethane, they are easy to use and difficult to use in the synthesis of polyurethane and its raw materials. Commonly used catalysts include tertiary amine catalysts (including their quaternary ammonium salts) and organometallic compounds.
Tertiary amine catalysts can be mainly divided into aliphatic amines, alicyclic amines, aromatic amines, alcohol amines and their ammonium salt compounds. Aliphatic amine catalysts include N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl)ether, triethylenediamine, and N,N,N’,N’-tetramethylalkylene diamine, N,N,N’,N”-pentamethyldiethylenetriamine, triethylamine, N,N-dimethylbenzylamine, N,N-dimethylhexadecylamine, N,N-dimethylbutylamine, etc.
Alcoholamine compound catalysts include triethanolamine, N,N-dimethylethanolamine, etc. Alcohol catalyst is a type of reactive catalyst that can be used in conjunction with other highly active catalysts. Triethanolamine is also a cross-linking agent for molded foams.
Research data shows that (dimethylaminoethyl) ether (A-1) has high catalytic activity, and its reaction rate constant is higher than triethylene Diamine is 50% higher. Polyurethane catalyst In the activity comparison test, the butanol-phenyl isocyanate model reaction system was used to study the alcohol- Isocyanate reaction kinetic data, water and phenyl isocyanate model reaction system are used to study water-isocyanate reaction kinetics, the solvent is 25°C toluene-dimethylformamide (90/10), and an equal amount of stannous octoate is added to each system .
