Silicone rubber (English name: Silicone rubber), thermal vulcanization type (high temperature vulcanization silicone HTV), room temperature vulcanization type (RTV), of which room temperature vulcanization type is divided into condensation reaction type and addition reaction type.
High temperature silicone rubber is mainly used in the manufacture of various silicone rubber products, while room temperature silicone rubber is mainly used as a bonding agent, potting material or mold. The amount of hot vulcanization type is the largest, and the hot vulcanization type is divided into methyl silicone rubber (MQ), methyl vinyl silicone rubber (VMQ, the amount and product grade are the most), methyl vinyl phenyl silicone rubber PVMQ low temperature resistance, radiation resistance), and other rubber, fluorine silicone rubber.
Silicone resin, scientific name polysiloxane resin (English name: Silicone resin) is a highly crosslinked structure of polyorganosiloxane, both organic resin and inorganic material dual characteristics, silicone resin has unique physical and chemical properties.
Classification of silicone resin Silicone resin is a semi-inorganic cross-linked polymer with silica-oxy-silicon as the main chain and organic groups attached to silicon atoms. It is with the direct production of silicone monomer silicone resin has outstanding weather resistance, which is beyond any kind of organic resin, even under strong ultraviolet irradiation, silicone resin is also resistant to yellowing.
Features:
Silicone rubber has excellent heat resistance, cold resistance, dielectric property, ozone resistance and atmospheric aging resistance, silicone rubber outstanding performance is the use of a wide temperature, can be used in -60℃ (or lower temperature) to +250℃ (or higher temperature) for a long time. However, the tensile strength and tear strength of silicone rubber and other mechanical properties are poor, at room temperature its physical and mechanical properties are not as good as most synthetic rubber, and in addition to nitrile silicon, fluorine silicone rubber, the general silicone rubber oil resistance, solvent resistance is poor, so silicone rubber is not suitable for ordinary conditions, but very suitable for many specific occasions.
Silicone resin is mainly used as: insulating paint (including varnish, enamel paint, color paint, impregnating paint, etc.) impregnating H-class motor and transformer coil, and used to impregnate glass cloth, glass cloth wire and asbestos cloth to make motor bushing, electrical insulation winding, etc. Large area mica sheet insulation material can be prepared by bonding mica with silicone insulating paint and used as the main insulation of high voltage motor.
In addition, silicone resins can also be used as heat and weather resistant anticorrosive coatings, metal protective coatings, waterproof and moisture resistant coatings for construction engineering, release agents, adhesives and secondary processing into silicone plastics for electronic, electrical and defense industries. As a semiconductor packaging material and electronic, electrical silicone resin according to its main uses and crosslinking methods can be roughly divided into silicone insulating paint, silicone coatings, silicone plastics and silicone adhesives and other categories.
Silicone resins may include small molecules of silicone compounds, and the molecular weight need not be large. The silicone rubber must be a certain degree of molecular weight, with rubber state of polyorganosilane.