Classification of polyurethane catalysts

Classification of polyurethane catalysts
Polyurethane catalyst is a kind of auxiliary to accelerate the reaction of polyurethane.

Polyurethane catalysts About classification: According to its chemical structure formula type, it can be basically divided into two categories: tertiary amine catalysts and organometallic compounds. There are very many varieties of tertiary amines and organometallic compounds, and considering various factors, only twenty kinds are most commonly used in polyurethane production.

Amine catalysts are generally used in the production of polyurethane foam and are mainly divided into the following categories.

1、Aliphatic amine catalysts include N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, N,N,N’,N’-tetramethylene-alkylenediamine, triethylamine, N,N-dimethylbenzylamine, etc.

2、Alicyclic amine catalysts include solid amine, N-ethyl morpholine, N-methyl morpholine, N,N’-diethylpiperazine, etc.

3、Alcoholic compounds catalysts include triethanolamine, DMEA, etc.

4、Aromatic amines include pyridine, N,N’-dimethylpyridine, etc.

Organometallic catalysts: in polyurethane catalysts elastomers and adhesives, coatings, sealants, waterproof coatings, paving materials and other formulations, dibutyltin laurate (T-12) and other organometallic catalysts are most commonly used, it is very effective in promoting the isocyanate group and hydroxyl reflection, but in the formula with water to water and isocyanate reaction also has a certain accelerating effect, much doubt in the plastic runway and other formulations The special catalyst such as organic lead can be used in the formulation of plastic runway. Organometallic compounds include carboxylic acid salts, metal alkyl compounds, etc. The metal elements contained are mainly tin, potassium, lead, mercury, zinc, etc. The most commonly used are organotin compounds. Commonly used varieties: bis(dimethylamino)ethyl ether, pentamethylenediethylenetriamine, dimethylcyclohexylamine, dibutyltin laurate, organic bismuth, triazine trimer catalyst, etc.