MQ silicone resin is a relatively unique structure of silicone resin. It consists of an organosilicon compound containing a tetrafunctional siloxane link (SiO4 / 2, Q) and a monofunctional siloxane link (R3SiO1 / 2). , M) The organosilicon compound is a three-dimensional spherical structured silicone grease formed by co-hydrolysis-polycondensation reaction. Its molar mass is generally 1000 to 8000 g / mol. It has a state from a viscous fluid to a solid powder, is hard and brittle, and has a wide glass transition temperature (Tg) range.

It is generally believed that MQ silicone resin is a compact double-layered spheroid, in which the core is a cage-shaped SiO2 with Si—O chain connection, higher density, and a degree of polymerization of 15-50, and the spherical shell is a lower density R3SiO1 / 2 layer .

MQ silicone resins have many different types due to the different organic groups R on the spherical shell:
When R is all methyl, it is called methyl MQ silicone resin or MQ silicone resin for short; when part of R is H, it is called methyl hydrogen MQ silicone resin; and methylphenyl MQ silicone resin, vinyl MQ Silicone tree, phenyl MQ silicone resin, fluorine-containing MQ silicone resin, MDQ, MTQ silicone resin, etc. The performance of MQ silicone resin and its application range mainly depend on its synthetic process conditions and the type and number of organic groups in the molecule, that is, the ratio of the number of M chain links to Q chain links; the organic group R is mainly added to other groups The compatibility of the components plays a role of increasing viscosity, and the SiO4 / 2 chain is mainly used to enhance the strength of the composite material to reinforce it.