What is the difference between the silicone products and rubber products?
Heat resistance properties.
Organic silicon products in silicon, oxygen (
Key chain structure, C - C key in the key for 82.
6 kcal/mol, Si - O can key in the key in the organic silicon is 121 kcal/mol, so the thermal stability of silicone products, high temperature (
Or radiation exposure)
Molecular bonds do not broken, do not break down.
Organic silicon not only resistant to high temperature, and low temperature resistant, can be used in a wide range of temperatures.
Chemical properties and physical and mechanical properties, along with the change of temperature are small.
Weatherability of organic silicon products main chain - Si - O -, no double bonds exist, therefore not easy by uv and ozone decomposition.
Organic silicon is better than other high polymer materials and the thermal stability of the irradiation resistance and weather resistance ability.
The service life of organic silicon in the natural environment can be up to several decades.
Electric insulation performance of organic silicon products have good electrical insulating properties, the dielectric loss, voltage resistance, arc resistance, corona resistance, volume resistivity and surface resistivity of all came out on top in the insulation material, and their electrical performance is affected by temperature and frequency is small.
As a result, they are a kind of stable electric insulation material, is widely used in electronics, electrical industry.
Organic silicon besides has excellent heat resistance, but also has excellent water repellency, this is using electrical equipment in wet conditions with high reliability.
Physiological inert polysiloxane compounds are known one of the most inactive compounds.
They are very resistant to biological aging, and the animal body without rejection, and has good anticoagulant capability.
Low surface tension and low surface energy of organic silicone products main chain is very smooth, the intermolecular force is much weaker than hydrocarbons, therefore, than with low molecular weight hydrocarbons viscosity, surface tension, surface energy is small, film forming ability.
This kind of low surface tension and low surface energy is the main reason why it for various applications: hydrophobic, foam, foam stability, adhesion, lubrication, polishing, and other excellent performance.
The purpose of the organic silicon due to the organic silicon has these excellent performance, so it has a very wide range of application scope.
Detection of silicone rubber method 1.
For coarse silica gel, can be put in the furnace heats up to 500 -
By 600 ℃, which is about 6 -
8 hours to colloidal particles with a white or brown.
For fine silica, roasting temperature should not exceed 200 ℃.
This fulling the silica gel in the saturated water vapor adsorption saturation after heat soak rinse, and can be combined with detergent to remove waste or other organic impurities, drying dehydration after water washing.
3. Solvent flushing method based on silica gel adsorption organic matter types, choose the appropriate solvent adsorption in silica gel dissolution of organic matter, and then heat the silica gel to removing solvent, silica gel regeneration problems should be paid attention to.
___________ when drying regeneration should be paid attention to gradually raise the temperature, in order to avoid severe dry cause colloidal particle cracking, reduce the recovery.
2. The silica gel regeneration, roasting temperature is too high will cause the silica gel pore structure change and significantly reduce its adsorption effect, affect the use value.
For the blue gel indicator or discolor silica gel, stripping regeneration temperature shall not exceed 120 ℃, otherwise you will lost due to gradual oxidation agent color effect.
3. After the regeneration of silica gel shall generally be sieve to remove fine particles, in order to make uniform particles.