Application of MQ resin in Silicone Pressure Sensitive Adhesive

Silicone Pressure Sensitive Adhesive (SPSA) is a special adhesive composed of silicone resin (commonly used MQ silicone resin), silicone rubber, catalyst, crosslinking agent, and other additives. Silicone pressure-sensitive adhesives mainly include solvent type, high solid content type, solvent-free type, emulsion type, radiation curing type, resin modification type, biodegradable type, functional type, and other systems.

Since the solvent type contains a large amount of volatile organic compounds, during curing, the volatilization of the solvent can easily cause serious pollution to the environment. Nowadays, environmental protection has been paid more and more attention. The silicone pressure-sensitive adhesive industry is taking environmentally-friendly low-cost products as the development mainstream, and new products such as biodegradable and radiation curing products are the research direction. MQ silicone resin is mainly used to increase viscosity and strengthen. The silanol or vinyl in MQ resin can respectively react with the hydroxyl group of silicone rubber or through the condensation reaction of hydrogen-containing siloxane and silicone rubber under the action of a catalyst. Silicone pressure-sensitive adhesive.

The indicators to measure the adhesive performance of Silicone Pressure Sensitive Adhesive are tack T, adhesion A, cohesion C, and keying K. To obtain pressure-sensitive adhesives with excellent performance, We must consider how to make the 4 kinds of adhesive force meet the following balance relationship: K ＞C ＞A ＞T. The research shows that the ratio of silicone resin to rubber material has the greatest impact on the performance of pressure-sensitive adhesives. With the increase of the amount of silicone resin, the cohesive force of the pressure-sensitive adhesive increases, but the peeling force decreases; with the increase of the amount of silicone rubber, the initial viscosity increases. But the stickiness is reduced. This is because silicone rubber can increase the fluidity of the pressure-sensitive adhesive, thereby increasing the interfacial adhesion, and has a strong initial tack; the reduction in the amount of resin is not conducive to deep crosslinking, the reinforcing effect is not good, and the cohesion is reduced. The molecular weight of MQ resin has a greater impact on the adhesive performance of the Silicone Pressure Sensitive Adhesive because the change of molecular weight causes the viscosity and cohesive strength of the Silicone Pressure Sensitive Adhesive to change. When the molecular weight is high, the Silicone Pressure Sensitive Adhesive has high cohesive strength and good stickiness; when the molecular weight is low, its bulk viscosity is low, which can improve the interfacial adhesion, but the polymer has low cohesive strength and is prone to cohesive failure during peeling. When the molecular mass distribution of MQ resin is wide, and the number average molecular mass is about 3000, it can be used to prepare pressure-sensitive adhesives. Nicolas studied the adhesion properties of acrylic adhesives to silicone elastomers containing different quality MQ silicone resins to adjust the mechanical properties of the tape (mainly peel strength). The results show that the amount of MQ silicone resin in the elastomer has a great influence on the performance of the modified tape, and controlling the surface properties of the elastomer is an effective way to adjust the peeling force.

XJY-8205M Methyl MQ Silicone Resin Toluene Solution is an important raw material for SPSA. It is long-lasting so that can improve glue adhesion, glue temperature resistance, and  the adhesion of glue to the substrate.

XJY-301 and 302 series Silicone Pressure Sensitive Adhesive (SPSA) is a colorless transparent stick liquid with good cohesion, stable adhesion and is non-toxic, environmentally friendly. It can be applied in Aluminum substrate laminating tape, Medical tape, PI, PET, PTEF, etc.

XJY Silicones

XJY Silicones as one of the leading silicone manufacturers is a new enterprise for silicone resin innovation and R&D, with more than 30 years of experience in the silicone industry. Our manufacturing, R&D, and sales services had obtained the ISO9001 certificate.