The raw rubber basis of one-component room-temperature vulcanizing silicone rubber is α,ω -dihydroxypolysiloxane, and its vulcanization process depends on moisture in the air.
Commonly used crosslinking agents, such as methyltriacetoxysilane, react with water to form acetic acid and remove hydroxyl groups, which then condense with linear organosilicon to form a crosslinked structure.
This type of rubber is usually packed in sealed hoses and contains silanol end groups, fillers, catalysts, etc. When in use, it is extruded and reacts with moisture in the air, vulcanizing into an elastomer and releasing low-molecular substances. The choice of crosslinking agent will affect the type of product. For example, the type that releases alcohol after crosslinking with alkoxy groups is called the dealcoholization type, and the type that generates oxime after crosslinking with oxime groups is called the deoxime type. At present, the deacidification type one-component room-temperature vulcanizing silicone rubber is the most commonly used variety.