Main properties of PU catalyst

For PU catalysts, for relatively simple PU coatings, there are still certain limitations in their appearance, gloss, water resistance, and hardness during industrial production and application. Therefore, it is possible to try to develop modified PU coatings to improve their performance. performance level. At the current level of technology, there are two types of modification methods that can be applied to PU materials: one is through chemical intervention, so that PU coatings can have two or more properties; the second is through physical methods. In the way of intervention, two or more resin materials with complementary characteristics are mixed, so that PU coatings can have diversified properties. Among them, for silicone materials, the material has a series of characteristics and advantages such as non-corrosion, non-toxicity, flame resistance, ozone resistance, weathering resistance, electrical insulation, etc., and has a very good performance in the modification and processing of PU coatings. application value.

The PU catalyst has carried out the basic research and development of polyurethane powder coatings, and successfully developed a closed isocyanate crosslinking system. The commonly used is caprolactam-blocked IPDI curing system, and its curing temperature is above 170 ° C. This high temperature curing is conducive to the coating film. High leveling, is a variety without volatile by-products. Previous reports also pointed out that trying to combine silicone materials with polyurethane coatings and applying appropriate methods for modification processing can obviously overcome the performance defects of PU materials, which is of very definite value for expanding the application field of PU materials. At the same time, the chemical structure of polysiloxane is relatively special, showing excellent stability, biocompatibility, electrical insulation and high and low temperature resistance. It has been widely used in industrial production practice since the 1940s. During the research and development of modified PU catalysts, it is possible to use polysiloxane as the soft segment to synthesize polysiloxane-PU block copolymers to highlight the PU As well as the advantages of polysiloxane, it shows the outstanding advantages of the modified PU coating in terms of surface enrichment, dielectricity and biocompatibility, and has a very large application space and development potential.