Classification of silicone rubber
Silicone rubber According to its curing temperature, can be divided into high-temperature heating vulcanization (HTV) and RTV (RTV) Two types, high-temperature glue is mainly used in the manufacture of various silicon rubber products, while the temperature glue is mainly used as bonding agent, potting materials or mold use.
1, Hot vulcanized silicone Rubber (HTV)
Hot vulcanized Silicone Rubber (HTV) is the most important kind of organic silicon products, methyl vinyl silicone rubber (VMQ) is the most important kind of HTV, commonly known as high temperature glue. Methyl vinyl silicone rubber (crude rubber) is colorless, odorless, non-toxic, non-mechanical impurities glue, raw rubber in accordance with the need to participate in the appropriate reinforcement agent, construction section preparations, curing agent and other additives mixing together, then heating molding or extrusion molding, and then by two-paragraph curing to make all kinds of finished products. Its finished products have excellent electrical insulation, arc resistance, corona, electric spark can be strong, waterproof, moisture-proof, anti-impact, good anti-seismic, with psychological inertia, breathable and other functions.
Mainly used in aviation, instrumentation, electronic appliances, sail sea, metallurgy, machinery, automobiles, medical and health parts, can do all kinds of shape sealing rings, gaskets, tubes, cables, but also can do human organs, blood vessels, breathable membranes and rubber molds, fine forging release agent.
2. RTV Silicone Rubber (RTV)
RTV silicone rubber generally for condensation type and addition of two major types of molding.
Condensation-type RTV silicone rubber is characterized by the condensation reaction between SI hydroxyl and other active substances, and can be cross-linked into elastomer at room temperature, the product is divided into single-group packaging and two-pack packaging. Single-component RTV Silicone Rubber (hereinafter referred to as RTV-1 glue) is one of the first products of condensed liquid silicone rubber. Where the foundation polymer, cross-linking agent, Catalyst, filler and additives are prepared. Product packaging in the sealed hose, when the use of extrusion, contact with the air can be vulcanized into elastomer, the use of very convenient. Vulcanized rubber can be used in (– 60~+200 ℃) temperature limitation for a long time, with excellent electrical expired margin function and chemical invariance, ability to water, ozone resistance, weather aging, a variety of metals and non-metallic materials have superior bonding. Mainly used as a variety of electronic components and electrical equipment Shang, packet sealing materials insulation, moisture-proof, shockproof effect; As a semiconductor device exterior maintenance data, also can be used as sealing gaps and elastic bonding agent.
Adding molding room temperature glue is a linear polysiloxane with vinyl-based gum, with hydrogen-containing siloxane as cross-linking agent, in the catalyst deposit in the room temperature to moderate to the onset of the cross-linking reaction to become elastic body. It has superior heat resistance, hydrophobic, electrical insulation, but also because of the introduction of active end base, so that it has excellent physical and mechanical functions, especially in the tensile strength, relative elongation and tear intensity has a distinct progress. It is used in a variety of curing methods, such as radiation vulcanization, peroxide vulcanization and forming vulcanization, commonly used in heat-resistant, moisture-proof, electrical insulation, high-strength silicone rubber products.