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New product answer: application of precipitated silica

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As mentioned above, silica can be used as a reinforcing agent and filler in rubber tire shoe making; carrier and filler in feed, pesticide and medicine; matting agent, thickening agent and anti settling agent in coating ink; filler in paper making; friction agent and thickening agent in toothpaste. It is widely used in rubber, tire, shoe making, feed, plastic, paper making, paint, cosmetics, toothpaste and ink.
Today, let's focus on the main uses of precipitated silica.



       The rubber industry is the main consumer market of silica, accounting for more than 70% of the total consumption of silica. As a rubber reinforcing material, precipitated silica is mainly used in shoes, tires and other light colored rubber products. Rubber processing is also the most potential market for silica.
As shown in the figure, the consumption of footwear products accounts for 33.5%, tire industry accounts for 28.5%, other rubber products account for 12%, pesticide feed industry accounts for 8%, toothpaste industry accounts for 3.5%, paint and coating accounts for 2.5%, and other uses account for 12%.
It can be seen that the consumption of silica in footwear products far exceeds that of other industries. As a rubber filling material, the use of silica can not only make the processed soles have good wear resistance, anti-skid performance and vamp adhesion performance, but also can process the color transparent rib sole, which is beyond the carbon black. Therefore, silica has been widely used in a variety of light color and color footwear products, such as travel shoes, casual shoes, craft shoes and shoes with tendon soles.
China is the largest shoe producer and consumer in the world, with an annual output of more than 10 billion pairs of shoes, accounting for about 70% of the world's total footwear output. Among the footwear output, leather shoes account for about half and rubber shoes account for about 1 / 3. Due to the large number of domestic shoe-making enterprises, private enterprises and foreign capital account for a considerable proportion. Adding silica in footwear products can reduce the use of carbon black and raw rubber. However, due to the rising prices of raw materials, the appreciation of RMB and the rise of labor costs, the growth rate of footwear industry slowed down during the 12th Five Year Plan period. In recent years, the consumption proportion of white carbon black for shoes showed a downward trend. On the contrary, silica for tires showed an upward trend.
It is widely used in China's domestic and industrial tire, including white carbon and steel cord, which is widely used in China's tire and industrial tire Glue, etc.
Adding silica to the tread compound can greatly improve the physical properties of the compound, reduce the lag of the compound, improve the cutting and tearing resistance of the tread, reduce the jumping and falling blocks, reduce the rolling resistance of the tire, improve the grip performance on wet road surface and the tear resistance of the tire, without losing its wet skid resistance.
Thanks to the rapid development of automobile industry, China's tire industry has ushered in a period of rapid growth under the stimulation of market demand. With the increasing requirements of radial tire, environmental protection, energy saving and comfort, the application of silica in tire is becoming more and more important. At present, in terms of reducing rolling resistance and improving grip performance, the combination of silica and carbon black shows excellent performance, and silica has been used to replace carbon black to produce "green tire".
The new tire label regulation is a very big driving force for the renewal of tire materials. Tire enterprises will use SSBR more to replace ESBR, and the corresponding reinforcing materials will also change from carbon black to silica. Tires have great potential in the future market of silica. With the development of green tires in China, the proportion of silica for tires in the world will increase from 33.49% in 2015 to 49.64% in 2020. The proportion of highly dispersed silica in the world will increase from 29.46% in 2015 to 48.55% in 2020. The consumption and consumption proportion of silica for tires are on the rise.
In addition, the main uses of precipitated silica in our company, pesticides and fire extinguisher additives, should not be underestimated.
China has been a big country of pesticide production and use since ancient times. Since 2018, China's environmental protection supervision has been further enhanced, and long-term mechanisms such as environmental protection tax and pollutant discharge permit system have been established, and the pesticide industry has been focused on supervision due to the large amount of pollutants produced. With the establishment of new pesticide management regulations and other mechanisms and the continuous tightening of pesticide supply side, small enterprises with backward technology and imperfect environmental protection measures will be eliminated from the market, and the supply and demand pattern of China's pesticide industry is expected to gradually improve.
It is worth mentioning that silica has a large specific surface area and is an ideal carrier of high-efficiency pesticide. When white carbon black is used as emulsion dispersant and granule of various pesticides, it can release pesticides and pesticides after a large amount of absorption, so that the insecticidal time is long and the effect is good.
In addition, precipitated silica can also be used as auxiliary agent for dry powder fire extinguisher. As filler, it can prevent vibration and agglomeration, improve the movement performance of dry powder, catalyze the polymerization of dry powder silicone oil and improve the capacity of foam extinguishing agent.



       Dry powder fire extinguishing agent is a kind of fine solid powder which is easy to flow. It is mainly composed of fire extinguishing, anti caking, dyeing, product performance improvement and other auxiliary materials. The fire extinguishing components are generally NH4H2PO4, (NH4) 2SO4, NaHCO3 and NaCl The anti caking components include silicone oil, silica, perchloroethylene, metal carboxylate and activated clay; the dyeing component is the corresponding pigment; mica powder is the component to improve the electrical insulation and fluidity of the product; talc powder, barite, calcium carbonate and other natural minerals as auxiliary materials can also improve the product performance.
The anti caking treatment of various dry powder fire extinguishing agents is the same in principle.
Silicone oil covers the surface of the particles and forms a solid protective layer after polymerization. The surface modification of particles changes from hydrophilic to hydrophobic (hereinafter referred to as hydrophobicity or hydrophobicity), and it is not wet when meeting water, so it is not easy to agglomerate with each other. When the powder contacts with water, the water surface will automatically absorb the hydrophobic silica and other small particles nearby to form an impermeable protective layer to block the contact with the surrounding environment. Due to the change of temperature and humidity in the protective layer, salt can only appear in the protective layer, which can effectively prevent the formation of lumps.


       Precipitated silica, sodium silicate reacts with acid to precipitate silica, which is widely used to produce dry powder fire extinguishing agent at home and abroad. Compare several kinds of silica used in China with that of a Japanese company, as shown in the figure,
The biggest difference between the two lies in the bulk density. The white carbon black pine density used by Japanese companies is larger because of their different production processes. The Japanese company's production process is to mix silica and ammonium phosphate to further reduce the particle size of silica. The domestic production process is that silica is directly mixed with other materials without further grinding.

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