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Which Properties of Silicone Rubber are More Practical´╝îIn Which Areas are They Mostly Used, Easy to Use

Feb 24, 2021

Silicone rubber is divided into thermal vulcanization type (high temperature vulcanized silica gel HTV) and room temperature vulcanization type (RTV). The room temperature vulcanization type is divided into polycondensation reaction type and addition reaction type. High temperature silicone rubber is mainly used to manufacture various silicone rubber products, while room temperature silicone rubber is mainly used as an adhesive, potting material or mold. The hot vulcanization type has the largest amount, and the hot vulcanization type is divided into methyl silicone rubber (MQ), methyl vinyl silicone rubber (VMQ, the most amount and product brand), and methyl vinyl phenyl silicone rubber PVMQ (low temperature resistance, radiation resistance) ), there are other silicone rubber, fluorosilicone rubber and so on.

Mechanical propertiesedit
The requirements for the mechanical properties of silicone resins mainly depend on the application. People are more concerned about the hardness, elasticity, thermoplasticity and adhesion of silicone resin used as electrical insulating paint, coating and adhesive. The hardness and elasticity of silicone resin paint film can be changed in a wide range by adjusting the molecular structure of the resin. When the content of trifunctional or tetrafunctional chain links is higher, that is, when the crosslinking density is higher, a paint film with high hardness and low elasticity can be obtained; the introduction of substituents with large steric hindrance can improve flexibility and thermal elasticity, which is positive This is the reason why the flexibility and thermoplasticity of methyl phenyl silicone resin is better than that of methyl silicone resin. Therefore, the silicone resin does not need to use special plasticizers, but can meet the requirements for plasticity by the appropriate combination of soft and hard silicone resins.

When used as some coatings, the hardness of the pure silicone resin coating film is insufficient, but the thermoplasticity is more than enough; if the organic modified silicone resin is used, this contradiction can be easily resolved.
Pigments and catalysts can also affect the hardness and elasticity of silicone resins. The pigment has the effect of accelerating the oxidation of the silicone resin paint film and transforming it into harder silica glass. The use of low-activity catalysts, due to the incomplete condensation reaction, can only obtain a soft coating; on the contrary, the use of high-activity catalysts (such as Pb, Al, etc.) can obtain hard and brittle coatings, but some catalysts (such as titanium) Ester) can effectively increase the hardness of the coating without severely reducing the elasticity.

Silicone resin has good adhesion to iron, aluminum, silver, tin, glass and ceramics, but poor adhesion to copper. Especially after high temperature and long-term thermal aging, the oxide film on the other side of the copper may be Accelerate the thermal cracking reaction of silicone resin. The adhesion of silicone grease to organic materials such as plastics, silicone rubber, etc., mainly depends on the latter's surface energy and compatibility with silicone resin. Materials with lower surface energy and poorer compatibility are more difficult to bond. Through the treatment of the surface of the substrate (including sanding and primer), especially the introduction of tackifying components into the silicone resin, the adhesion of the silicone resin to the difficult-to-stick substrate can be improved to a certain extent.
Compared with other adhesives, silicone rubber has a higher usage rate. Silicone rubber is recognized in many industrial fields because it has outstanding advantages and is worthy of being used. So, what are the significant advantages of silicone rubber that have won the trust of users?
High temperature performance is relatively stable

This is the most prominent advantage of silicone rubber, which can withstand high temperatures. It can not only exert its due strength at normal temperature, but also work at high temperature. At room temperature, it cannot exert its strength 100%, which is far inferior to natural rubber and synthetic rubber. But in an environment above 200 degrees, it still maintains its due flexibility, elasticity and hardness. At this high temperature, there is no change in mechanical properties.

Performance is also good at low temperature
Silicone rubber can adapt to low temperature working environment and work normally in the environment of minus 70 degrees to minus 50 degrees. There are some products with special formulas that can perform in an environment of minus 100 degrees. This excellent performance is particularly practical and can be used in industrial fields. Cooperate with powerful suppliers to be more assured. For example, COSMO is focusing on silicone rubber research and providing customized silicone rubber application solutions. It has a wide range of applications and can be used in new energy, military, medical, aviation, shipping, electronics, and automobiles. , Instrument, power supply, high-speed rail and other industries.
Very good weather resistance

Silicone rubber does not have high requirements for the working environment, and can resist oxidation, ultraviolet rays and ozone. Even without adding other additives, it can also exert good weather resistance.
Very good electrical performance
Silicone rubber contains insulating material, which greatly improves the insulation performance. No matter what field it is used in, it can exhibit insulation, corona resistance and arc resistance, and is very durable.

Good physical and mechanical properties
At room temperature, the physical and mechanical properties of silicone rubber are pretty good. It can be used normally in the environment of minus 50 degrees to 150 degrees above zero, no need to worry.

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