How does addition molding liquid silicone rubber solidify?

The addition molding liquid silicone rubber commonly used in production is a new type of material, mainly composed of polydimethylsiloxanes terminated (or flanked) with vinyl groups, cross-linking agents containing hydrogen silicone oil, and platinum based catalysts. According to the requirements of product application, corresponding fillers, inhibitors, color pastes, spices, and other additives are added. Fillers, also known as fillers, are typically quartz powder, silica obtained by vapor phase or precipitation methods, and inhibitors are alkynol inhibitors. With low shrinkage, strong curing ability, excellent mechanical and electrical properties, and convenient molding, it is an excellent functional material for modern life generation, widely used in electronic and electrical, automotive, medical, and other fields.

How does additive liquid silicone rubber solidify? What is the principle?

The curing principle of addition molded liquid silicone rubber is to add a catalyst (platinum catalyst) to the silicone rubber and conduct a catalytic reaction to solidify it.

Addition liquid silicone rubber usually uses platinum catalysts under mild reaction conditions, and is commonly used in the synthesis of downstream silicone products and the preparation of room temperature curable coatings, adhesives, etc. However, due to the high activity of platinum catalysts, the operating time for cross-linking catalysis is relatively short. The reaction control of platinum catalyzed hydrosilylation requires the selection of appropriate catalysts based on their solubility and catalytic speed in the base polymer.