Traditional silicone resins have methyl/phenyl functional groups and contain up to 95% siloxane in their skeleton. In typical high temperature cured silicone resins, the content of alkoxy functional groups is very low, and the polymer structure has high molecular weight. A small number of alkoxy functional groups were kept for 30 min at about 250℃ for cross-linking.
The new normal temperature curing silicone resins are different from the previous generation of silicone resins mainly because of their oligomer properties. This means that they contain a low molecular weight siloxane structure and a higher alkoxy functional group. This characteristic also enables it to have high solid content (up to 100%) and low viscosity.
Hydrolysis reaction by moisture at room temperature
02 Condensation reaction
In order to achieve the polymerization of the resin by condensation cross-linking, these functional groups are first required to undergo a hydrolysis reaction to form the silanol group. These silanol groups will then react in the form of alcohol condensation. When this reaction is complete, the resin takes on the properties of polysiloxane and releases alcohol reaction by-products.