“Silica gel” is a condensate of silica having a molecular formula of mSiO2.H2O. The “silica gel” is a highly active adsorbent material, which is an amorphous substance, insoluble in water and any solvent, non-toxic and tasteless, chemically stable, and does not react with any substance except strong alkali and hydrofluoric acid. And we often say rhinoplasty, the silica gel filled in the breast is this kind of silica gel. However, in the mold industry, the silica gel we mentioned is usually not the silica gel of the hydrate of silica mentioned above, but a synthetic rubber, which is called silicone rubber because it contains a silicon atom component, and is simply referred to as silica gel.
How to distinguish between silicone and silicone rubber?
When the silica gel is burned, there is no open flame and the white soot is white, the rubber is black smoke, the gray is black, and it is particularly stinky.
Rubber is divided into natural rubber and synthetic rubber. The structure of natural rubber is high polymer of isoprene, synthetic rubber such as butadiene rubber, neoprene rubber, styrene-butadiene rubber and the like. When the crosslinked rubber is deformed by external force, it has the ability to recover quickly and has good physical and mechanical properties and chemical stability.
The main component of silicone rubber is a high molar mass linear polysiloxane.
Since the Si-O-Si bond is the basic bond type of the Si-O-Si bond, the silicon atom is mainly linked to the methyl group, and a very small amount of unsaturated groups are introduced into the side chain. The intermolecular force is small, the molecule has a helical structure, and the methyl group faces outward. Arranged and freely rotatable, so silicone rubber has excellent resistance to high and low temperature -100~315 °C after vulcanization, weathering, hydrophobicity, electrical insulation, physiological inertness, etc., in the defense industry, medical and health, industrial and agricultural production and people It has been widely used in daily life.
Focus: No toxicity, commonly used in pacifiers, breast augmentation.
Liquid silicone rubber can be used in trademarks, articles, nipples, medical supplies, coating, dipping and infusion. Silicone products for molding, injection molding, cake molds, etc. for crystal glue, polyurethane, epoxy resin, etc., widely used in the electronics industry as moisture-proof, shipping, insulating coating and potting materials for electronic components. It protects electronic components and assemblies from dust, moisture, shock and insulation. If the transparent gel is used to encapsulate the electronic components, it not only can play the role of shockproof and waterproof protection, but also can see the components and can detect the fault of the components with the probe, and replace them. The damaged silicone gel can be refilled. repair. It can also be used in the manufacture of product forming molds for gypsum, wax, epoxy resin, polyester resin, polyurethane resin and low melting point alloy. It is applied to high frequency embossing of artificial leather, surface and bottom molding of shoes, manufacturing of arts and crafts, Ceramics, toy industry, furniture, household appliances, electronic components industry replication and molding of gypsum, cement materials, molding of wax products, manufacturing of models, molding of materials, etc.
Liquid silicone needs to be produced by injection machine, mainly used for baby products, medical supplies and electronic products (buttons). There is also a kind of A/B mixed directly into the mold, and then baked in the oven oven (silica gel) Production and operation methods), as well as silica gel, trademark glue, etc. used to make liquid silicone roller, mainly depends on what product you use. Generally, liquid silicone gel is used after being vulcanized, but it can also be used as a filler, such as an electrical insulating filler, or a liquid silicone filler for breast augmentation, or as an additive in cosmetics.