Home > News > Industry News

Selection of Polyurethane Catalyst

2021-08-10

Selection of polyurethane catalyst

Polyurethane  products are mainly synthesized by polyether, isocyanate, blowing agent, catalyst, etc. The main process of foam formation is generally considered as follows:

1. The foam is produced in the polyurethane reaction system through physical and chemical methods, and the foam is uniformly dispersed in the reaction system. The main foaming method is to use water and isocyanate to produce carbon dioxide. Bubble. 

2. The foam generation process requires that the viscosity of the reaction system increase to stabilize the foam from being escaped. 

3. When the foam formation reaches the required number and size, the viscosity of the reaction system needs to continue to increase or even form a cross-linked system to stabilize the foam and shape it into a product.

In this case, at least two catalysts are needed to adjust the progress of the reaction. One catalyst is to promote the reaction of isocyanate and water, that is, to promote the foaming reaction. Generally, amine catalysts are selected; the other is to promote The reaction of isocyanate and polyether or alcohol, that is, the reaction of polyurethane molecular chain growth and crosslinking, generally uses metal catalysts. Therefore, amine catalysts and organometallic catalysts are generally used in the synthesis process of polyurethane foam in order to produce a synergistic effect to achieve the best effect.

Polyurethane Catalyst