This kind of adhesive is based on silicone resin. Add some inorganic filler and organic solvent mixed, used for bonding metal, glass fiber reinforced plastics, etc. When curing, due to further condensation and release of small molecules, so the need to heat, pressure.
Silicone adhesive temperature resistance is the most outstanding performance, it can work at 400 ℃ for a long time without being damaged, can be used for the structural bonding and sealing parts, screw, the fixed and mica layer of chip bonding, can also be a short period of time to work in the ultra high temperature, the adhesive bonding can withstand 1000 ℃ flame burner, load 0.249 MPa at this time more than 4 h, nor damage, Silicone adhesive also has good damp heat aging resistance. After 6 months of damp heat aging at 45-50℃ and high temperature (RH98%), the strength of room temperature decreases by 50%, and the strength of time decreases by 27% at 425℃.
In addition, after adding conductive silver powder, silicone resin can be prepared to withstand high temperature, high temperature conductive adhesive resistant to ion radiation, working temperature for a long time in the range of 200-250℃, can be used for the target and cathode bonding in electric vacuum rf sputtering technology. The application of silicone adhesives is limited due to the high curing temperature. In order to reduce the curing temperature, people try to add a small amount of ethyl oxilicate Si(OC2H5)4, potassium acetate CH3COOK and silicate glass in the components of the glue, which can reduce the curing temperature to 220 ℃ or 200℃. The high temperature strength is still 3.92-4.90mpa.