Prepn. of environment-protecting silicone resin

Abstract

The invention refers to a method of preparing the environmental-protection-type organic-silicon rosin. It adopts the return method to synthesize the organic-sillicon rosin directly from the return step of neutralizing the back enriched silicon. And at the same time, it can add the polyester in different proportion to the return step according to the needs of different products, and under the condition of steady temperature 145 minus or plus 2 C, have the full-return reaction for 6 hours or so using the silicon-alkyl coupled agent to adjust the needed product's viscosity. The invention features in simple technique, convenient operation and saving energy sources. As adopting the full-return of the liquid phase to produce, the reaction medium all the time is in the solvent so the produced resin has light colour and even molecular weight.

Description

Technical field [0001] The invention relates to a production method of silicone resin. Background technique [0002] At present, domestically produced silicone resins such as W30-3, W31-1, W31-2, 1151, and 1153 are basically used as insulating varnishes with a single purpose. The following two production processes are generally used. One is high-temperature air oxidation. During the polycondensation process, the organic groups on the silicon atoms are oxidized due to the use of vacuum suction to oxidize the organic groups on the silicon atoms, so the color of the product becomes darker. Due to the destruction of the organic groups, the R / Si ratio of the resin is reduced. The quality of the product is also unstable. In terms of operation, especially in the later stage of the reaction, the operator must sit on the high-temperature reaction kettle to observe the reaction situation, open the lid constantly, and take out the high-temperature resin wire drawing to control the end ...

AI Technical Summary

Problems solved by technology

One is high-temperature air oxidation. During the polycondensation process, the organic groups on the silicon atoms are oxidized due to the use of vacuum suction to oxidize the organic groups on the silicon atoms, so the color of the product becomes darker. Due to the destruction of the organic groups, the R / Si ratio of the resin is reduced. The quality of the product is also unstable. In terms of operation, especially in the later stage of the reaction, the operator must sit on the high-temperature reaction kettle to observe the reaction situation, open the lid constantly, and take out the high-temperature resin wire drawing to control the end point. Due to the different technical levels of the operators, It will also make the product quality unstable, and at the same time, due to high temperature sampling, it will also cause burns, which is not conducive to safe production

The second is to use carboxylate catalysts, which also need to be synthesized by condensation under high temperature and high vacuum conditions. Later workers must also stand by the side of the reactor to observe and continuously take samples to measure observation points. Due to temperature fluctuations, the molecular weight is uneven, and there are also Resin appearance is darker