KSY SILICONE PRODUCTS Co.,LTD

Silica gel is a kind of highly active adsorption material, belongs to the amorphous substance, which contains polysiloxane, silicone oil, silica black (silica), coupling agent and filler and so on. The main component is silica, its chemical formula is mSiO2·nH2O. Insoluble in water and any solvents, non-toxic and tasteless, stable chemical properties, except strong alkali, hydrofluoric acid does not react with any substance. Different types of silica gel form different microporous structures due to their different manufacturing methods. The chemical composition and physical structure of silica gel, determines that it has many other similar materials are difficult to replace the characteristics: high adsorption performance, good thermal stability, chemical stability, high mechanical strength and so on.

Silica gel raw material

Classification of silica gel:

According to its vulcanization characteristics, silica gel can be divided into hot vulcanized silicone rubber and room temperature vulcanized silicone rubber two categories. According to the different performance and use can be divided into general type, super low temperature resistance type, super high temperature resistance type, high strength type, oil resistance type, medical type and so on. According to the different monomer used, it can be divided into methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, fluorosilicone, nitrile silicone rubber and so on.

What are the molding conditions from raw gum to compound gum?

1, in the process of mixing, due to the low intermolecular cohesion of silicone rubber, so high reinforcement and high temperature resistance of silica filler

It is the most important compound of silicone rubber. When choosing other compound agents, the nursery rhyme needs to consider the requirements of high temperature resistance, that is, under the application conditions of silicone rubber, they shall not volatilize, decompose, carbonize or discolor. In order to maintain the heat resistance of silicone rubber and reduce the fracture of silicon bond by acid and alkali attack, foreign acid and alkali should be prevented when mixing. Also in time to remove peroxide sulfide agent decomposition produced by acid substances!

2. The mixed raw glue and other ingredients are cooked in the vacuum kneader. The temperature is not high at the beginning

During the process, the temperature of the height is slowly rubbed through, reaching 155-160 degrees when another half an hour can be done.

3, in the cooked glue in the mixer to smooth, roll, this as long as pay attention to do not dirty, the number of rolling

It only takes two or three laps

4, after grinding, to cool, the time is about 3-4 hours, and then through the screen, the glue filter again, eye

Is to filter out some of the solid material inside the glue.

Silica gel raw material

What are the types and characteristics of white carbon black?

There are two main methods: gas phase method and precipitation method:

Gas phase method: mostly from silicon tetrachloride, mixed with chlorine gas, oxygen (air), at a high temperature of more than 1000 degrees, hydrogen and oxygen first combustion to produce water, and then with silicon tetrachloride action, hydrolyzed to produce, micro powder, after polymerization, capture and acid removal, white carbon black products.

Advantages of gas phase method: pure height, less sioh, high reinforcement rate, hot air vulcanization, high transparency of vulcanized adhesive, good electrical performance, sealing, cushion resistance and dynamic fatigue resistance.

Gas phase method Uses: car parts, wires, cables, medical food, high strength, high transparent silicone rubber products, gaskets.

Precipitation method: Starting from water glass, adding hydrochloric acid or sulfuric acid to neutralize the reaction under stirring, to obtain SIO2 precipitation, filtration, drying, grinding into high fineness white carbon black.

It can also be obtained from alkaline earth metal-silicic acid by acid decomposition reaction.

Advantages of precipitation method: vulcanized rubber resilience, compression permanent deformation, swelling resistance and good processing performance, cheap price, rubber material is not easy to structure, and can only be used in rubber, plastic products filled, reinforcing.

Precipitation method uses: general molding products, cots, oil - resistant gasket materials.

What's the difference between silicone and rubber?

We often think that silicone is a kind of rubber, but this is not true.

The main components of the raw materials of silica gel are extracted from the silica stone (such as silicone oil, white carbon black), and the raw materials of rubber are extracted from the resin, the cost of silica gel is more expensive than rubber, more environmental protection.