Based on the different production and uses of Polyurethane Catalyst products, we usually choose to use three functions of the catalyst: promoting chain growth and promoting reaction system The reaction speed of certain specific chemical reactions and the adjustment of various complex reaction balances. Various polyurethane catalysts are based on their own catalytic characteristics and various industries. The requirements for catalytic properties are used in different fields.
First of all, the editor of Shanghai Zhengui New Materials will introduce to you the application of polyurethane catalysts in the foam industry:
The polyurethane foam industry has high requirements for polyurethane catalysts. To turn viscous polyols and isocyanates into solid porous materials through mixing and stirring, catalysts are indispensable. It must have both foaming and gelling effects, and some products also require delay and trimerization effects. Therefore, in the preparation process of polyurethane foam, a variety of catalysts are often mixed and used. Tertiary amine catalysts, metal alkyl compounds, and organic amine salt catalysts are widely used in the PU foam industry.
The second is the polyurethane coating and adhesive industry
Coatings and adhesives The adhesive industry’s demand for catalysts mainly lies in two aspects: 1. Synthesis of prepolymers; 2. Product drying. Due to their gelling requirements, metal alkyl compounds are widely used in the coating and adhesive industries.
Finally, there is the polyurethane elastomer industry: most elastomers have almost strict requirements for moisture in the system, because the introduction of water will cause bubbles in the elastomer system. generation, thereby affecting the quality of the product. In the field of elastomers, polyurethane synthetic leather resin is an important branch. This industry does not have strict requirements for air bubbles in the system. This is confirmed by the fact that almost all resin factories are using recycled DMF with high moisture content. In the production of wet process materials, contact with water is inevitable. The selection of polyurethane catalysts in this industry is similar to that in the coatings and adhesives industry, and it also faces the same environmental issues.
