Siltech – Silicone Resins for Strengthening and for Improving Thermal Stability in Coatings
Silicone resins at Siltech are most commonly manufactured via the reaction products of silicates with trimethylsiloxy groups.
The result is a three-dimensional silicon-based cross-linked network, and these resins can be used to impart differing degrees of hardness and scratch resistance to Coatings.
The structures are often referred to as silicone MQ resins, because the network consists of tetrafunctional silicon atoms (Q groups, as shown below) which are end-capped with M groups (a silicon atom attached to one oxygen and three alkyls):
During the reaction, it is possible to vary the M:Q ratio. A higher M:Q ratio means more end-capping, and these products are 100% solvent-free pourable clear liquids.
Reducing the amount of end-capping means that the molecular weight increases, and therefore higher molecular weight MQ resins can be manufactured and provided in a range of carriers &/or solvents.
Then of course it is also possible to synthesise T, DT, TQ, DTQ resins and so on, with reactive alkoxy (methoxy or ethoxy) groups. Phenyl groups can be included for improved heat stability.
The table below shows some examples:
Hardness ranges from 5B to over 9H, which illustrates just how flexible this type of chemistry can be.
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