在線聊天
brief introduction
Commonly known as precipitated silica silica, also called silicate hydrate, silica, chemical formula of the general mSiO2 written in nH2O, the appearance of white amorphous powder highly dispersed, are processed into granules as a commodity. The specific gravity is 2.319 ~ 2.653 and the melting point is 1750. Does not dissolve in water and the vast majority of acid, in the air to absorb moisture will become the aggregation of fine particles. Soluble in hydrofluoric acid and caustic soda. For other chemicals stable, resistant to high temperature does not break down, do not burn. Has a high electrical insulation, porosity, large surface area, water absorption, non-toxic.
Product characteristics
Adhesion, anti adhesion, anti agglomeration, aggregation, control release, carrier, help flow, improve the printing effect, mechanical function, thermoplastic special additives, reinforcing, rheological control, whitening. The surface modification of hydrophobic silica is soluble in oil, rubber and plastics used as reinforcing filler, can make the product mechanical strength and tear index increased significantly. Due to different manufacturing methods, physicochemical properties and microstructure of silica will have some differences, so its application field and application effect is different.
Precipitated silica is widely used, and different products have different purposes. As a good synthetic rubber reinforcing agent, the reinforcing performance after carbon black, if ultra fine and proper surface treatment, or even better than that of carbon black. Especially for the production of white, color and light colored rubber products more applicable. Used as a thickening agent or thickener, synthetic oils, mixture insulating paint, paint flatting agent, thixotropic agent electronic element encapsulating material, fluorescent screen coated fluorescent powder deposition agent, printing rubber filler, casting mold release agent. The moisture and insulation properties of resin can be improved with the addition of resin. Filled in the plastic products, can increase the anti - sliding and anti - oil. Filled in silicone resin, can be made resistant to more than 200. Used as a filler and paper surface ingredients in the papermaking industry.
Precipitated silica (general): products and rubber and various additives and good compatibility, good dispersibility, white spots and less impurities, suitable for all kinds of shoe soles, transmission belt, rubber parts, tires and other ordinary
Precipitated silica (silicon rubber): This product is made of superfine white carbon black masterbatch manufacture of silicone rubber, and high specific surface and low surface of two types, high specific surface area, suitable for high temperature vulcanized silicone rubber (such as: buttons, transparent silicone rubber, high temperature high pressure sealing ring); low the specific surface area, applied to room temperature (such as glass glue, glue sealant etc.)
Precipitated silica (fire grade): This product is suitable for ABC and BC dry powder fire extinguishing agent, modified to prevent subsidence, caking, out of good performance
Precipitated silica (roller level): the product specific surface area can reach 205 to 235, will give the hardness of rubber roller product comparison, 90-95 reached the shore, all kinds of industrial rubber roller (milling roller, printing roller, transmission rollers, special rollers etc.) reinforcing agent
Precipitated silica (pesticide grade): This product is dry powder as a carrier of pesticide, and agricultural groups have about material good compatibility, has a very small pore volume and absorption of pesticides components, which can guarantee the long release effect
Precipitated silica (granular environment-friendly): This product for particles of environmentally friendly products, powder after granulating machine extruding molding, prevent dust, can effectively disperse in the tire, and is mainly used for radial truck tire industry in
Precipitated silica is rubber reinforcing materials widely used, generally speaking, the precipitated silica (surface treatment, the exception of superfine reinforcing effect of carbon black) is not good, it is a semi reinforcing filler material. Therefore, according to the use of occasions decided to replace the percentage of carbon black. Precipitated silica for tyre rubber products have cars, dump trucks, trucks, tractors, trucks, bicycles, belts, hoses, gaskets, rubber, food processing industry and threshing rollers, rubber shoes and other rubber products are more or less used silica. Add a certain amount in the ordinary tire in silica can improve the service life of the tire. According to the former West Germany company tire formulation research test results show that if it was equipped with 10 ~ 20 phr silica can improve cementing and tear resistance, so that the tire mileage increase, but also enhance the tire grip on the road, in order to facilitate safe driving. China's tire mileage is lower than the international standard, do not use the carbon black is one of the reasons. In addition, due to the carbon black heat, foreign automotive tyre for highway also tend to add white carbon black. On a bicycle tire market at home and abroad are also increasingly diversified, such as tire bead color and flash ring fancy new varieties are used instead of white carbon black carbon black production. In the production of rubber shoes, rubber shoes, boots, people sports shoes, travel shoes, gym shoes, ballet shoes, not only the requirements and requirements of color fastness, beautiful, comfortable and light. Silica has good reinforcing properties, wear resistance, skid resistance and adhesion of the vamp, and is a good light reinforcing material, so in the development of rubber overshoes to provide shoes quality and style plays an important role.
Silica can be used as filling material in polyethylene, polypropylene, polybutene, epoxy resin and other plastic, can improve the elastic strength and wear resistance and hardness of plastics, thermal stability. For cable can also improve the electrical insulation of the cable, such as methyl vinyl silicone rubber pressure line with fumed silica or high quality precipitated silica. In two layers of plastic thin
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