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Mar 24, 2023
(1)MeSiCb is directly hydrolyzed and condensed to produce methyl silicone resin. In an acid resistant reaction with an agitator with a rotating speed of 200~240r/min, add 13 parts of ice water mixture by mass, maintain at 0 ° C, and stir. Add 1 part of MeSiCb within 0.5h, and maintain stirring for 1min. The product can be transferred to a settling tab. Maintain at 0 ° C for 4~5h, allowing the condensation reaction to be further completed, and allowing the generated methyl silicone resin to settle. Remove the flocculent from the liquid surface, discharge the acid water, slowly add deionized water at 70 ° C with stirring, and the silicone resin will condense into a white solid. Filter off the water layer and continue washing with deionized water at 70 ° C several times until neutral. Then air dried or vacuum dried to obtain a white solid silicone resin that is easily crushed. It is completely soluble in ethanol and neutral. The softening point is 40~47 ° C. The gel time at 150 ° C is about 9 min. The applicable period is 2 to 7 days. The product is suitable for preparing high temperature and arc resistant molding materials.
(3) A transparent methyl silicone resin is prepared from MeSi (OR). The hydrolysis rate of the SiOR bond in MeSl (OR) 3 (R is Me, Et) is much slower than that of the Si-Cl bond, so that it requires the aid of a catalyst to successfully hydrolyze. This method is easier to obtain prepolymers with predetermined properties and containing SiOH and SiOR. After curing, it has high transparency and good wear resistance, and is suitable for use as a hardening coating and waterproof agent for transparent plastics. For example, when MeSi (OEt) is hydrolyzed under the catalysis of excess water and a trace amount of hydrochloric acid, the initial reactant is divided into two phases, and as the reaction proceeds and the amount of by-product EtOH increases, it is converted into a homogeneous phase. Finally, a colorless transparent methyl silicone resin containing SiOEt and soluble in thousands of EtOH is obtained. The specific process is as follows: adding an industrial grade MeSi (OEt) and saturated Na2C03 aqueous solution at a volume ratio of 100: (1-2) to a column bar for heating, steaming, and refining, After removing the low boiling substance from the tower top, collect the refined MeSi (OEt) 3, which has a boiling range of 140~145 ° C and a CHCI content of as low as 2 µ L/L. Take out 180 parts by mass, add them to a porcelain binding reaction stick with stirring, add another 60 parts of dilute hydrochloric acid containing 153 µ L/L HCI, and fry for 3 hours at 80 ° C 'at 80 ° C, then add 0.025 parts of Me core NHSiMe3 to neutralize HCI, heat up to 90 ° C, evaporate most of EtOH and water, and heat up to ll0 ° C within 0.5 h to complete the silicone resin pre curing process. After cooling, add 110 parts of anhydrous ethanol, 200 parts of methyl silicone resin ethanol solution with a concentration of about 40% (mass fraction) were obtained by filtration.
SILIBASE SILICONE currently including below silicone resins: Methyl Silicone Resin IntermediateMethyl, MQ Silicone Resin Powder, MQ Silicone Resin,Liquid MQ Silicone Resin,Silicone Resin for Motor, Amino Phenyl Silicone Resin,Vinyl MQ Silicone Resin, Silicone Adhesive.