Does liquid silicone need to undergo vulcanization?
Does liquid silicone need to undergo vulcanization? Liquid silicone is a new material made by mixing multiple materials, all of which are formed through vulcanization. Why does liquid silicone need to be vulcanized, and what are the functions of vulcanized silicone?
The reason why silicone needs to be vulcanized is mainly because silicone needs to be processed and molded. The original silicone is a material that has not been molded, and it is vulcanized through a process to produce the desired silicone product; There are many types of vulcanization molding, including machine high-temperature vulcanization molding. This type belongs to solid silicone gel, which is vulcanized through vulcanizing agents and high-temperature equipment; Another type of machine operated molding is injection molding, which involves mixing two types of liquid silicone gel through machine operation, injecting it into a mold, and then rapidly molding it at high temperature.
In addition to machine operation, there are also manually operated vulcanization molding processes. Common ones include room temperature vulcanization molding of silicone gel, which can be divided into two types: one is single component silicone gel. This type of silicone gel only has a single component vacuum packaging and is cured by contact with air. This type of product is mainly used for bonding and sealing; Another type is: two-component room temperature vulcanization molding, which is generally used in the production of silicone molds. By reacting with another component B catalyst, a chemical reaction is generated to promote the curing of silicone.
This type of two-component silicone is divided into two types: industrial grade and food grade. Industrial grade silicone can only be vulcanized at room temperature, and the temperature has little effect on the vulcanization time. Because it solidifies through organotin catalysis and contact with moisture in the air; Food grade silicone can be vulcanized at room temperature or by heating, which belongs to platinum catalysis. The prepared silicone can accelerate curing by increasing the temperature, making it suitable for mass production of products