Based on the production and use of polyurethane catalyst products, we usually choose to use three functions of the catalyst: promotion Chain growth, promoting the reaction speed of certain specific chemical reactions in the reaction system, adjusting the balance of various complex reactions, various polyurethane catalysts are based on their own catalytic properties and the requirements of various industries for catalytic properties. , respectively used in different fields.
First of all, the editor of Shanghai 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. The viscous polyol and isocyanate are mixed and stirred into a solid porous material, and a catalyst is 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.
The demand for catalysts in the coating and adhesive industry 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 the generation of bubbles in the elastomer system, 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.
