A: Additive silicone rubber is the most active product series of silicone materials in recent years. Compared with other silicone rubber, it has the following advantages: no by-products in the vulcanization process, small shrinkage, deep curing, no corrosion to the contact materials, safe and environmental protection in the production process, short molding cycle, high degree of automation, good strength of finished products, transparent, tasteless Easy to reach food grade, medical grade, etc. Therefore, additive silicone rubber is more and more widely used in medical treatment, food, electronics, packaging, intelligent wearable devices and other fields.






Addition silicone rubber is a silicone elastomer with network structure formed by crosslinking vinyl containing polymers (such as vinyl raw rubber, vinyl silicone oil, vinyl silicone resin, etc.) with hydrogen containing polymers (such as hydrogen containing silicone oil, hydrogen containing silicone resin) through hydrosilylation reaction; In this process, a catalyst must be added to enable the hydrosilylation reaction to proceed. The most widely used catalyst with the highest catalytic efficiency and the highest cost performance is platinum catalyst (commonly known as platinum water).


Traditional platinum catalysts can be divided into the following categories:






one


Speier catalyst: isopropanol, ethanol and other solutions of chloroplatinic acid; The catalyst is easy to manufacture and use; However, the disadvantages are low catalytic efficiency, yellow color and easy oxidation. Therefore, it is only applied to a few special products and industries.






two


Karstedt's catalyst: complex of chloroplatinic acid and vinyl double head; The catalyst has high reaction activity, light color, good storage stability and good compatibility with silicone products. Therefore, it has been widely used in industry.






three


Ashby's catalyst: complex of chloroplatinic acid and vinyl ring; The catalyst has high reaction activity and good yellow resistance; Excellent storage stability. It is mostly used in products and industries with high appearance requirements.






When the above traditional platinum catalyst is used, the rubber will quickly lose fluidity and produce cross-linking at room temperature, which is not conducive to product molding. Therefore, in industrial production, platinum catalyst and cross-linking agent are generally added to additive silicone rubber to make rubber of components a and B, or additives of components a and B, The reaction inhibitor is added to the hydrogen containing components to adjust the operation time, and then mixed according to the proportion during use, which not only increases the production cost, but also reduces the production efficiency, which brings great inconvenience to the industrial production.


Recently, Guangzhou Siyou New Material Technology Co., Ltd. grandly launched pt-2500dz-x colorless transparent additive silicone rubber single component platinum catalyst series products; This one component platinum catalyst does not need to add inhibitors when used; It can be directly added to the silicone rubber system together with hydrogen containing crosslinking agent. The rubber has a long operable time, can be stably stored at room temperature for more than six months, can be vulcanized rapidly at high temperature, and the vulcanization speed can be adjusted according to customer needs. It can be used to produce high value-added single component addition molding liquid silicone rubber, solid silicone rubber, pressure-sensitive adhesive, silicone glue, silicone ink, etc; It can also be used to produce one component platinum curing agent, which partially replaces the traditional peroxide curing agent.