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May 5, 2023
In polyester modified silicone resin coatings, the introduction of NC2 pressure ratio NHC3 pressure Si COMe and SiCOCH pressure ratio OMe can achieve low-temperature curing. For example, 100 parts by mass of polyester [40 0: 70. Copolymer prepared from 4 parts of dimethyl terephthalate and trilight methyl propanol, 150 parts of methyl phenyl silicone resin intermediate, 167 parts of cellulose acetate, and 0 Three parts of isopropyl methacrylate were reacted at 150 ° C for 4 hours, and then diluted with 2-ethoxyethanol and butanol to obtain a polyester modified silicone resin solution with a solid content of 30%. Take out 25 parts and mix them with 4 parts to press NC2, NHC3H, i (OMe) 3, o. 5 parts of Si (OC2, OMe) 4, and 0 75 parts of 50% (mass fraction) Bu2Sn (OCOC17 H ring as solution) were coated on aluminum plates and cured at 80 ° C for 2 hours to obtain a coating with a thickness of 5 µ m, hardness (pencil) B, and resistance to CBEK.
Many silicone modified polyesters are prepared using a two-step process, with strict requirements for reaction control of polyester prepolymers. Otherwise, it will directly affect the condensation reaction during silicone modification and the success of the silicone modified polyester reaction, ultimately affecting the performance of the product. Since the invention of a one-step method for preparing silicon modified polyester, silicon modified polyester without pre condensation has always been a hot topic in this field, which involves the reaction of organic silicon intermediates with polyols and then with polybasic acids. Similarly, the method of preparing Si-0-C type organic silicon modified polyester through monomer copolymerization modification can also be achieved. This can not only further reduce or avoid gel of products, save time and energy, improve production efficiency, but also narrow relative molecular Mass distribution, and the prepared coating has better water resistance, solvent resistance, weather resistance and gloss retention.
Silicone modified polyester was prepared by polycondensation with low molar mass warp based silicone oil as a partial substitute for diols.
The results showed that the molar mass of polyester chain segments in silicone modified polyester was greater than the molar mass of polyester without the introduction of tibial silicone; Moreover, with the increase of the amount of light silicone oil, the molar mass of polyester chain segments increased accordingly. This is because in the presence of light based silicone oil, not only does the condensation reaction between the thionyl and light groups occur, but also some of the thionyl groups undergo condensation, resulting in an increase in the molar mass of the polyester chain segment. The content of organic silicon in silicone modified polyester increases with the increase of the amount of tibia based silicone oil, with a molar fraction of 6 Reaching the limit at 7%. The organic silicon modified polyester prepared by this method has low surface energy and can be used as a low surface energy additive or surfactant.
Our main products are Silicones in Hair Care，Silicone Resin Blend for Personal Care，Dimethicone Silicone Resin Blend，Amino Phenyl Silicone Resin，Silicone Resin Modifier for Artificial Leather，Synthetic Leather Silicone Resin Modifier.