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Modified polyurethane coating, polyurethane manufacturers are in use

2019-07-29

Modified polyurethane coating




For the relatively single polyurethane coating, in the process of industrial production and application, its appearance, gloss, water resistance and hardness are still some limitations, so we can try to improve its performance by developing modified polyurethane coating. Under the current technical level, there are two types of modification methods applicable to polyurethane materials: one is chemical intervention to enable polyurethane coatings to have two or more characteristics; The second is to mix two or more resin materials with complementary properties through physical intervention, so that polyurethane coatings can have diversified properties. Among them, organic silicon material has a series of characteristics and advantages, such as non-corrosion, non-toxicity, fire resistance, ozone resistance, weathering resistance, electrical insulation, etc., and has a very good application value in the modification of polyurethane coating. Bayer took the lead in the basic research and development of polyurethane powder coatings, and successfully developed the closed isocyanate cross-linking system. The commonly used is the caprolactam closed IPDI curing system, whose curing temperature is above 170 ℃. This high-temperature curing is beneficial to the high level of the coating film, and it is a kind of non-volatile by-product released. Previous reports also pointed out that attempts to combine organosilicone materials with polyurethane coatings and apply appropriate methods to modify processing can obviously overcome the performance defects of polyurethane materials, which is of great value for expanding the application field of polyurethane materials. At the same time, polysiloxane has a special chemical structure, showing good stability, biocompatibility, electrical insulation and high and low temperature resistance. Since the 1940 s are widely used in industrial production practice, the research and development process of modified polyurethane material, can try with polysiloxane as soft segment, polysiloxane - polyurethane block copolymer synthesis, in order to highlight the advantages of polyurethane and polysiloxane both, reveal the modified polyurethane coating on the surface enrichment, dielectric properties and biocompatibility of outstanding advantage, have the very big application space and development potential


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