Silicone rubber is one of the largest and most widely used types of silicone products. After vulcanization, silicone rubber has excellent high and low temperature resistance, weather resistance, hydrophobicity, electrical insulation, physiological inertia and other characteristics, and has been widely used in national defense and military industry, medical and health, industrial and agricultural production and people's daily life.

The main properties and applications of silicone rubber products: Silicone rubber can be divided into two categories according to its vulcanization temperature: high temperature (heating) vulcanization type and room temperature vulcanization type. High temperature rubber is mainly used to manufacture various silicone rubber products, while room temperature rubber is Mainly used as an adhesive, potting material or mold.

Hot Vulcanized Silicone Rubber (HTV)

Hot vulcanized silicone rubber (HTV) is the most important type of silicone products, and methyl vinyl silicone rubber (VMQ) is the most important variety in HTV, commonly known as high temperature rubber. Methyl vinyl silicone rubber (raw rubber) is a colorless, odorless, non-toxic, non-mechanical impurity colloidal substance. The raw rubber is mixed with appropriate reinforcing agents, structure control agents, vulcanizing agents and other additives as needed. It is smelted, then heated to press molding or extrusion molding, and then made into various products through two-stage vulcanization. Its products have excellent electrical insulation, strong resistance to arc, corona, electric spark, waterproof, moisture-proof, impact resistance, shock resistance, physiological inertia, air permeability and other properties. Mainly used in aviation, instrumentation, electronic appliances, navigation, metallurgy, machinery, automobiles, medical and health departments, etc., can be used as sealing rings, gaskets, pipes, cables of various shapes, and can also be used as human organs, blood vessels, breathable membranes and Rubber molds, mold release agents for precision casting, etc.


Room temperature vulcanized silicone rubber (RTV)

RTV silicone rubber generally includes two categories: condensation type and addition type. The addition type room temperature adhesive is based on a linear polysiloxane with vinyl group as the base adhesive, with hydrogen-containing siloxane as the crosslinking agent, and in the presence of a catalyst, a crosslinking reaction occurs at room temperature to medium temperature to become an elastomer. It has good heat resistance, hydrophobicity, electrical insulation, and at the same time, due to the introduction of active end groups, it has excellent physical and mechanical properties, especially in tensile strength, relative elongation and tear strength. improvement. It is suitable for a variety of vulcanization methods, such as radiation vulcanization, peroxide vulcanization and addition vulcanization, and is widely used in heat resistance, moisture resistance, electrical insulation, and high-strength silicone rubber products.

Condensation type RTV silicone rubber is characterized by the condensation reaction between silicon hydroxyl groups and other active substances, and can be cross-linked into an elastomer at room temperature. The products are divided into one-component packaging and two-component packaging. form. One-component room temperature vulcanized silicone rubber (RTV-1 for short) is one of the main products of condensation type liquid silicone rubber. It is usually formulated from base polymers, cross-linking agents, catalysts, fillers and additives. The product is packaged in a sealed hose, extruded during use, and can be self-vulcanized into an elastomer after contact with air, which is extremely convenient to use. Vulcanizate can be used for a long time in the temperature range of (-60 ~ +200 ℃), has excellent electrical insulation properties and chemical stability, water resistance, ozone resistance, weather resistance, and has good adhesion to a variety of metal and non-metallic materials. Connectivity. Mainly used for the coating of various electronic components and electrical equipment, the encapsulation material plays the role of insulation, moisture-proof and shock-proof; as a surface protection material for semiconductor devices; it can also be used as a sealing filler and an elastic adhesive, etc.

Two-component room temperature vulcanized silicone rubber (RTV-2 for short) is not as convenient to use as RTV-1, but its component ratio is rich in changes. One variety can obtain vulcanized products of various specifications and properties, and it can also be deeply vulcanized. Therefore, it is widely used in electronic appliances, automobiles, machinery, construction, textile, chemical industry, light industry, printing and other industries as insulation, packaging, caulking, sealing, moisture-proof, shock-resistant and roller materials. In addition, because RTV-2 has excellent mold release properties, it is widely used as a soft mold material for the reproduction and manufacture of cultural relics, handicrafts, toys, electronic appliances, mechanical parts, etc.