Vulcanized silicone rubber (RTV) is a new type of silicone elastomer that came out in the 1960s. The most notable feature of this rubber is that it can be cured in situ without heating and pressure at room temperature, and it is extremely convenient to use. Become an important part of the whole silicone product. Vulcanized silicone rubber is a new type of silicone elastomer, which is used to manufacture one-component and two-component sealants of dealcoholized, deacetic acid, and deketoxime type. It has very good mold release properties, especially It is suitable for making precision molds; it can also be used in electronic potting glue as an insulating material. Utilize the good characteristics of high and low temperature resistance of 107 glue.
High-temperature vulcanized silicone rubber is a high molecular weight (generally 400,000 to 800,000 molecular weight) polyorganosiloxane (ie raw rubber) added with reinforcing fillers and other various additives, using organic peroxide as a vulcanizing agent, and press molding (Molding, extrusion, calendering) or injection molding, and cross-chained into rubber at high temperature.
(2) Molecular structure
High-temperature vulcanized silicone rubber is a high-molecular-weight polysiloxane (the molecular weight is generally 400,000 to 800,000), while the room temperature vulcanized silicone rubber generally has a lower molecular weight (30,000 to 60,000), with bands at both ends of the molecular chain (sometimes in the middle). There are one or two functional groups, and under certain conditions (moisture in air or appropriate catalyst), these functional groups can react to form high molecular weight cross-linked structures.
Vulcanized silicone rubber can protect against moisture, corrosion and shock. It can improve the performance and stability parameters of silicone rubber. RTV silicone rubber has excellent anti-stick properties after vulcanization, and the shrinkage rate is extremely small during vulcanization. Vulcanized silicone rubber is especially suitable for deep potting materials and has a faster vulcanization time.
Vulcanized silicone rubber is widely used as adhesives, sealants, protective coatings, potting and molding materials, and has its uses in a variety of industries. Various electronic and electrical components are coated and potted with room temperature vulcanized silicone rubber, and are widely used in sealing in the automotive and machinery industries, shock-resistant materials, rubber roller materials in textile, plastic, and printing industries, and caulking sealing materials in the construction industry. At the same time, it can be used to manufacture soft molds for casting epoxy resin, polyester resin, polystyrene, polyurethane, vinyl plastic, paraffin, low melting point alloy, etc. In addition, the high simulation performance of two-component RTV silicone rubber can replicate various exquisite patterns on cultural relics.
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