1. room temperature vulcanized silicone rubber
Room temperature vulcanized silicone rubber (RTV) is a new type of silicone elastomer introduced in the 1960s, the most significant feature of this rubber is that it can be cured in place without heating at room temperature, such as pressure, and it is extremely convenient to use. Therefore, as soon as it came out, it quickly became an important part of the entire silicone product. Now room temperature vulcanized silicone rubber has been widely used as adhesives, sealants, protective coatings, pot-sealing and molding materials, in all walks of life have its uses.
sort:Room temperature vulcanized silicone rubber can be divided into one component and two component room temperature vulcanized silicone rubber according to its packaging, and can be divided into condensation type and addition molding according to the vulcanization mechanism. Therefore, room temperature vulcanized silicone rubber can be divided into three types according to the composition, vulcanization mechanism and use process, that is, single component room temperature vulcanized silicone rubber, two-component condensation type room temperature vulcanized silicone rubber and two-component addition molding room temperature vulcanized silicone rubber. These three series of room temperature vulcanized silicone rubber each has its own characteristics: the advantage of single component room temperature vulcanized silicone rubber is easy to use, but the deep curing speed is difficult; The advantages of two-component room temperature vulcanized silicone rubber are that there is no heat release during curing, the shrinkage rate is very small, there is no expansion, there is no internal stress, the curing can be carried out in the interior and the surface at the same time, and it can be deeply vulcanized; The vulcanization time of molded RT-vulcanized silicone rubber is mainly determined by the temperature, so the vulcanization rate can be controlled by the adjustment of temperature.
2. high temperature vulcanized silicone rubber
High temperature vulcanized silicone rubber is a high molecular weight (molecular weight is generally 400,000 to 800,000) of polyorganosiloxane (that is, raw rubber) adding reinforcing fillers and other additives, using organic peroxides as vulcanizing agents, by pressure molding (molding, extrusion, calender) or injection molding, and at high temperature cross-chain into rubber. This rubber is generally referred to as silicone rubber.
The reinforcing filler of silicone rubber is various types of white carbon black, which can increase the strength of vulcanized rubber by ten times. The addition of various additives is mainly to reduce the cost of the rubber, improve the performance of the rubber and give the vulcanized rubber various special properties such as flame retardant, conductive and so on.
3. Silicon gel
After vulcanization, this glue becomes a soft and transparent silicone gel, which can remain elastic for a long time in the temperature range of -65 ~ 200℃. It has excellent electrical and chemical stability, water resistance, ozone resistance, climate aging resistance, water-repellent, moisture-proof, shock-proof, non-corrosion, and has physiological inertia, non-toxic, tasteless, easy to fill, deep vulcanization, low shrinkage, simple operation and other advantages, silicone gel in the electronics industry is widely used as electronic components moisture-proof, insulation coating and pot-sealing materials. It can protect electronic components and assemblies against dust, moisture, shock and insulation. If the use of transparent gel potting electronic components, not only can play a shock-proof and waterproof protection, but also can see the components and can use the probe to detect the fault of the components, replacement, damaged silicon gel can be potting again repair. Silicone gel is an ideal inner coating material for transistors and integrated circuits due to its high purity, convenience and elasticity, which can improve the pass rate and reliability of semiconductor devices. Silicone gels can also be used as elastic adhesives for optical instruments. In the medical field, silicone gels can be used as organs implanted in the human body, such as artificial breasts, and used to repair damaged organs.
4. foam silicone rubber
Foam silicone rubber is liquid before vulcanization and is suitable for potting and sealing materials. Foam silicone rubber is an ideal lightweight packaging material because of its high thermal stability, good thermal insulation, insulation, moisture resistance, and shock resistance, especially at high frequency.