Silicone rubber has been widely used, but some people may not understand and distinguish silicone rubber and silica gel, and the name is not fixed. When we hear the word "silicone," it's important to understand whether it's silica or silicone rubber, or inorganic or organic. In summary, silica gel can be divided into organic silica gel and inorganic silica gel according to its properties and components.

1. the performance of silicon rubber technical parameters

Silicone rubber is one of the most widely used silicone products with the largest output. Vulcanized silicone rubber has excellent high resistance, low temperature, weather resistance, hydrophobic, electrical insulation, physiological inertia and other characteristics. Main performance and application of silicone rubber products: silicone rubber can be divided into high temperature (heating) vulcanization type and room temperature vulcanization type according to its vulcanization temperature. High temperature rubber is mainly used to manufacture all kinds of silicone rubber products, while room temperature rubber is mainly used as adhesive, potting material or mold.

Hot vulcanized silicone rubber (HTV)

Hot vulcanized silicone rubber (HTV) is the most important kind of silicone products, methyl vinyl silicone rubber (VMQ) is the most important variety of HTV, commonly known as high temperature rubber. Methyl vinyl silicone rubber (raw rubber) is colorless, odorless, non-toxic, no mechanical impurities of the rubber, according to the need to add appropriate reinforcing agent, structural control agent, vulcanizing agent and other additives mixed together, and then heating molding or extrusion molding, and then through two sections of vulcanization into various products. Its products have excellent electrical insulation, arc resistance, corona, spark resistance, waterproof, moisture-proof, impact resistance, shock resistance, with physiological inertia, permeability and other properties. Mainly used in aviation, instrument, electronic appliances, navigation, metallurgy, machinery, automobile, medical and health departments, can be made of various shapes of sealing rings, gaskets, pipes, cables, also can be made of human organs, blood vessels, breathable film, rubber mold, precision casting release agent, etc.

RTV (Room temperature vulcanized silicone rubber)

RTV silicone rubber generally includes condensation type and molding two categories. Add molding room temperature glue is a vinyl linear polysiloxane as the base glue, with hydrosiloxane as the crosslinking agent, in the presence of a catalyst at room temperature to medium temperature crosslinking reaction and become an elastomer. It has good heat resistance, hydrophobicity and electrical insulation. At the same time, due to the introduction of active end group, it has excellent physical and mechanical properties, especially in the tensile strength, relative elongation and tear strength has been significantly improved. It is suitable for a variety of curing methods, such as radiation curing, peroxide curing and molding curing, widely used in heat resistance, moisture resistance, electrical insulation, high strength silicone rubber products and so on. Condensation RTV silicone rubber is characterized by condensation reaction between silicon hydroxyl and other active substances, which can be crosslinked into elastomers at room temperature. The product is divided into two forms of single-component packaging and two-component packaging. Rtv-1 rubber is one of the main products of condensed liquid silicone rubber. It is usually made of basic polymers, crosslinking agents, catalysts, fillers and additives. The product is packed in a sealed hose, extruded when used, and can be self-vulcanized into elastomer after contact with air, which is very convenient to use. Vulcanizates can be used in the temperature range of (-60 ~ +200℃) for a long time, with excellent electrical insulation and chemical stability, water resistance, ozone resistance, climate aging resistance, a variety of metal and non-metal materials have good adhesion. Mainly used as a variety of electronic components and electrical equipment coating, sealing material insulation, moisture, shock; As a surface protection material for semiconductor devices; It can also be used as sealing filler material and elastic adhesive.

Two-component RTV silicone rubber (referred to as RTV-2 rubber) is not convenient to use RTV-1 rubber, but its component proportion is rich in changes, a variety of vulcanized products can be obtained with a variety of specifications, but also can be deeply vulcanized, Therefore, it is widely used in electrical and electronic, automobile, machinery, construction, textile, chemical, light industry, printing and other industries as insulation, encapsulation, caulking, sealing, moisture-proof, anti-seismic and production of roller materials. In addition, because rTV-2 has excellent demoulding, as a soft mold material, it is widely used in the replication and manufacturing of cultural relics, handicrafts, toys, electronic appliances, mechanical parts and so on. One of the typical applications of silicone sealant is glass curtain wall. The glass and aluminum alloy frame is bonded with silicone structural adhesive as exterior wall material, and the expansion joint is waterproof and sealed with silicone weatherproof adhesive. Other applications also include used for aluminum alloy doors and Windows and plastic steel doors and Windows surrounding sealing, glass installation and moving groove joint, rivets and fixed screw sealing: kitchen, bathroom, toilet sanitary ware and table, wall, furniture waterproof sealing; Aquarium, ceiling, metal roof, window, counter, wall panel, color steel plate sealing; Used for waterproof caulking and sealing between high-grade highway plates. In addition to building sealant, RTV also includes sealing materials used in aerospace, nuclear power plant, electronics, machinery, automobile and other industries, silicone sealing materials for electronic components, silicone mold glue used as soft mold materials, etc. These varieties are in relatively low demand, but are indispensable in many situations.