Silica gel products are mostly made of silicone rubber, forming process is also mostly hydraulic molding, the lower the hardness is not only conducive to the product of the swing material, but also because of its semi-fluid internal structure in the process of high temperature vulcanization bubbles, so we choose this kind of product silica gel material requirements are very high, but also must use the best vulcanizing agent, The solution is to increase the power of the vacuum machine and improve the mold structure.
The toughness and elasticity of silicone products are very good, not easy to deformation due to external forces, and there will be a layer of greasy substances on the surface layer, so it will feel smooth to the touch. It is mainly used in construction machinery, automobiles, electronic products, household appliances, toys, medical treatment, sports equipment ………… And other industries, with shock absorption, sealing, anti-static, high and low temperature resistance, wear resistance, flame retardant, acid and alkali corrosion resistance.
The adsorption of silica gel is mainly physical adsorption, which can be regenerated and used repeatedly. Add acid to the alkali metal silicate (such as sodium silicate) solution to acidify it, and then add a certain amount of electrolyte to stir, that is, to generate silica gel.
Or adding acid or ammonium salt to a concentrated sodium silicate solution can also produce silicic acid gel. Silica gel is left for a few hours to age, then washed with hot water to remove soluble salts, dried at 60 ~ 70 ° C and activated at about 300 ° C to obtain silica gel.
Under normal circumstances, the hardness of silicone products is 30-80°, which is also an ordinary silicone hardness, suitable for most of the production of silicone products. Let's take the silicone tube as an example: silicone tube, also known as silicone hose. Used as liquid, gas and other material flow and coating carrier. Hardness: 70±5, tensile strength: ≥6.5
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