A silane crosslinking agent
refers to a silane containing two or more silicon functional groups. It can act as an in-line molecular bridge, so that multiple linear molecules or lightly branched macromolecules and polymers can be bonded to each other to form a three-dimensional network structure, which promotes or mediates formation of a bond or ionic bond between polymer molecular chains.
Crosslinking agent is the core part of one-component room temperature vulcanized silicone rubber, which is the basis for determining the cross-linking mechanism and classification of products.
According to the different condensation reaction products, the one-component room temperature vulcanization silicone rubber can be divided into different types such as deacidification type, deketoxime type, dealcoholization type, deamination type, deamidation type, and acetone removal type. It is a general-purpose product for mass production.
Taking the methyltriacetoxysilane crosslinking agent as an example, since the condensation reaction product is acetic acid, it is called a deacetic acid type room temperature vulcanized silicone rubber.
In general, silane crosslinking agents
are different from silane coupling agents, but there are exceptions. The aniline methyl triethoxy silane represented by α series silane coupling agent has been widely used in the one-component dealcoholized room temperature vulcanized silicone rubber.
Common silane crosslinking agents
Dealcoholic silane: alkyl triethoxy, methyl trimethoxy
Deacidified silane: triacetoxy, propyl triacetoxysilane
Deketoxime silane: vinyl tributol sulfonyl silane, methyl tributol ketone silane