Modified by phenolic resin, epoxy resin, polyester resin and polyurethane resin, it has good adhesion performance, can be cured at room temperature, and is resistant to high temperature. Silicone has good bonding properties to metals such as iron, aluminum and tin, and is also easy to bond to glass and ceramics, but has poor adhesion to copper. The silicone adhesive based on pure silicone resin is made of silicone resin and mixed with inorganic filler and solvent. When solidified, small molecules are released and heat and pressure are required.

KH-505 adhesive is a commonly used high temperature silicone adhesive. The base material is methyl phenyl silicone resin. The monomer has a R/Si value of 1.3 and a methyl/phenyl value of 1. Filled mica powder, asbestos, etc. can improve the strength of the adhesive at high temperature, asbestos can prevent the crack of the adhesive layer due to shrinkage, mica increases the wettability of the adhesive layer to the adherend, TiO2 increases the strength and improves the oxidation resistance, ZnO It can neutralize trace amounts of acid. The glue joint of KH-505 adhesive can withstand flame spraying at 1000 °C. At this time, it is loaded with 0 294 MPa for more than 4 h, and it is not damaged; its wet heat aging resistance is good. KH-505 high temperature conductive adhesive, high temperature resistant 200-250 ° C and ion-resistant radiation, can be used for the bonding of target and cathode in electric vacuum RF sputtering technology.

Silicone-based adhesives cure at too high a temperature and are limited in application. A small amount of ethyl orthosilicate, potassium acetate and silicate glass are added, the curing temperature is lowered to 220-200 ° C, the high-temperature strength is still 3 92-4 90 MPa, the pure silicone resin has low mechanical strength, and polyester, epoxy When copolymerized with an organic resin such as phenolic, high temperature resistance and excellent mechanical properties can be obtained for high temperature resistant structural adhesives.