Room temperature vulcanized silicone rubber generally includes two types of condensation and addition molding. The addition molding room temperature adhesive is a linear polysiloxane with a vinyl group as a base adhesive and a hydrogen-containing siloxane as a cross-linking agent. In the presence of a catalyst, a cross-linking reaction occurs at room temperature to intermediate temperature to become an elastomer. It has good heat resistance, water repellency, and electrical insulation. 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. Of improvement. It is suitable for a variety of vulcanization methods, such as radiation vulcanization, peroxide vulcanization, and addition vulcanization. It is widely used in heat resistance, moisture resistance, electrical insulation, and high-strength silicone rubber products.

Condensation type room temperature vulcanized silicone rubber is characterized by the condensation reaction between silicon hydroxyl groups and other active materials. It can be crosslinked into elastomers at room temperature. The products are divided into single-component packaging and two-component packaging. form. One-component room temperature vulcanized silicone rubber (RTV-1 rubber for short) is one of the main products in condensation liquid silicone rubber. It is usually formulated from base polymers, crosslinkers, catalysts, fillers and additives. The product is packed in a sealed hose, squeezed out during use, and can be vulcanized into an elastomer by itself after contact with air, which is extremely convenient to use. The vulcanizate can be used for a long time in the temperature range (-60 ～ + 200 ℃). It has excellent electrical insulation properties and chemical stability. It is resistant to water, ozone and weathering.接 性。 Accessibility. It is mainly used for coating of various electronic components and electrical equipment. The encapsulating material plays the role of insulation, moisture resistance and shock resistance; as a surface protection material for semiconductor devices; it can also be used as a seal filler and elastic adhesive.

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

One of the typical applications for silicone sealants is glass curtain walls. The glass and the aluminum alloy frame are bonded with a silicone structural adhesive as an exterior wall material, and the expansion joint is sealed with a silicone weatherproof adhesive. Other applications include peripheral sealing of aluminum alloy doors and windows, plastic steel doors and windows, sealing of glass installation and moving grooves, rivets and fixing screws: sanitary ware and countertops, walls and furniture in kitchens, bathrooms, and toilets. Watertight seal between rooms; aquarium, ceiling, metal roof, window, counter, wall panel, color steel plate; used for waterproof caulking between high-grade highway plates.

In addition to building sealants, RTV also includes sealing materials used in the aerospace, nuclear power plant, electronics, machinery, automotive and other industries, silicone potting materials used for potting electronic components, and silicones used as soft mold materials. Mold glue and so on. The demand for these varieties is relatively small, but in many cases it is essential.

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