Silicone pressure sensitive adhesives mainly include solvent type, high solid content type, solvent free type, emulsion type, radiation curing type, resin modified type, biodegradable type and functional type system. Because the solvent type contains a lot of volatile organic compounds, it is easy to cause serious environmental pollution when curing. Nowadays, more and more attention has been paid to environmental protection. The silicone pressure-sensitive adhesive industry is taking environmental protection and low-cost products as the mainstream of development, and taking new products such as biodegradation and radiation curing as the research direction. MQ silicone resin mainly plays the role of tackifying and reinforcing. The silicone hydroxyl or vinyl in MQ resin can respectively react with the hydroxyl of silicone rubber or with silicone rubber through hydrosiloxane under the action of catalyst to prepare silicone pressure-sensitive adhesive.

principle

Silicone rubber can increase the fluidity of pressure-sensitive adhesive, thus increasing the interface adhesion and the initial adhesion. Moreover, the molecular weight of MQ resin has a great influence on the adhesion performance of pressure-sensitive adhesive, because the change of molecular weight changes the viscosity and cohesion strength of pressure-sensitive adhesive. When the molecular weight of MQ silicone is about 3000, the pressure-sensitive adhesive has high cohesive strength, good adhesion, high peel strength and good thixotropy.


Application characteristics


It has high dispersibility and can improve the fluidity of colloid without thickening.


Part of the original vinyl silicone oil or epoxy resin can be replaced properly


Increase the thermal conductivity of the adhesive, reduce the coefficient of thermal expansion, improve the yellowing resistance, etc


The product has low moisture content, which is not easy to cause quality problems such as product foaming in hot air vulcanization


Improve vulcanization efficiency and reduce colloid structure degree


Usage method


Suitable for pressure-sensitive adhesive, epoxy potting adhesive, silicone potting adhesive, polyurethane potting adhesive series


Directly mix with basic raw materials at a certain temperature (50-60 ℃)


According to different requirements of different products, you can freely adjust the amount of added use.