How to solve the stability of room temperature storage of addition molded silicone rubber

Basic components of addition molded silicone rubber: vinyl silicone oil, reinforcing filler, hydrogen containing silicone oil, crosslinking agent, catalyst. When these components are mixed together, cross-linking reactions occur. Even with the addition of ordinary inhibitors, the cross-linking time can only be limited, and vulcanization usually occurs after 24 hours at room temperature. From this, it can be seen that the key to single component addition molding of silicone rubber is to solve the storage stability of the rubber material at room temperature. The current method to solve the stability of room temperature storage is generally to add low activity catalysts and inhibitors.
Platinum catalyst is a commonly used catalyst for addition molding of silicone rubber. The Karstedt catalyst is not suitable for single component addition molding of silicone rubber due to its high activity. And inhibitors have their own advantages and disadvantages. The effect of polyvinylsiloxane inhibitor is not very good. It is generally used to adjust the operation time in two components, but almost not in one component. Compounds containing N, S, and P are less used in the past because they are prone to poisoning platinum Catalyst poisoning.
In general, the lower the activity of the catalyst at room temperature or the better the inhibitory effect of the inhibitor at room temperature, the higher the sulfurization temperature is required; Increasing the storage stability of rubber at room temperature while reducing the vulcanization temperature is an important research direction for single component addition molding of silicone rubber.
Compared with condensed silicone rubber, addition molded silicone rubber has advantages such as no by-products during the vulcanization process, minimal shrinkage, deep vulcanization ability, and more environmentally friendly properties. Its sealing performance at high temperatures is also better than condensed silicone rubber. Compared to dual component addition molded silicone rubber and single component addition molded silicone rubber, it also has advantages such as easy storage and transportation, and convenient use.