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Application of polyurethane catalyst in molding soft foam
Edit:Nantong Yutai Chemical Products Co., Ltd.   UpDate:2019-10-11

Molded high rebound soft foam is a soft foam plastic with excellent performance. Due to its light weight, softness, high resilience and high hand comfort, it is widely used in industries related to daily life such as automobiles and furniture. With the continuous improvement of people's living standards and the increasing emphasis on environmental protection, the market is increasingly demanding the quality, odor and sporadicity of molded high resilience foam. Now, the following points are very high in the forming height. The main technical challenges faced by bomb bubble manufacturers.

Polyurethane catalyst technology challenge

(1) Foam odor and volatile organic compounds (VOC) In order to reduce the impact of polyurethane foam on people and the environment, and to ensure the safety of people in the production and use of polyurethane foam products, major automotive OEMs have established strict standards.

(2) Quick release

In recent years, the rapid development of China's polyurethane industry, especially the rapid development of the automotive industry, its growth rate is much higher than the annual growth rate of China's GDP. For automotive interior parts manufacturers, how to use existing production conditions to improve productivity through rapid demolding, reduce scrap rates and improve product quality is an economically viable solution.

With the continuous improvement of people's living standards, the demand for high-quality products and the emphasis on green environmental protection, polyurethane foam has developed towards higher quality, safer and more environmentally friendly. Air Products' Dabco series of amine catalysts and surfactants, as well as Polycat series of amine catalysts, are designed to help molded foam manufacturers address low odor, low emissions, low atomization, safety, environmental protection and rapid demolding. Challenges to help them gradually improve product quality and increase their market competitiveness in the increasingly fierce market competition.

The most commonly used catalysts for polyurethane foaming are tertiary amines, quaternary amines, amine salts and metal nucleic acid salts (usually SnII, SnIV or K+). A tertiary amine is used to promote gelation. Foaming and crosslinking reactions. Limb salts and heat-sensitive amines, such as diazobicycloundecane, are used to provide a blocking effect. Metal salts strongly influence the gelation reaction. The stannous compound (SnII) is low in cost but easily hydrolyzed and unstable. Its typical use is to be able to meter separate streams of applications, such as soft blocks. The tin compound (SnIV) is not easily hydrolyzed and can be incorporated into systems such as soft molded and rigid foams. For example, a specific class of compounds such as quaternary amines, potassium nucleic acids, tris(dimethylaminomethyl)phenol, and 2,4

A research report on polyurethane foaming catalysts mentions that the reaction of isocyanate with a polyol is called gelation, which ultimately produces a carbamate. The reaction of isocyanate with water (called a foaming reaction) ultimately produces dolphins. When the carbamate is further reacted with isocyanate at night, crosslinking may occur, and methyl formate and crater may be produced separately. Isocyanates can be self-condensed into trimers, dimers and carbodiimides in several different ways. The choice of catalyst affects the reactivity of the overall foaming system and the selectivity of some of the individual reactions described above. The reactivity of the foaming system is indicated by the activation time of the system, the curing process, the demolding or curing time.