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Method for preparing hydrophobic type nano silicon dioxide thruogh continuous surface treatment

A nano-silica, surface treatment technology, applied in the direction of dyeing organosilicon compound treatment, fibrous fillers, etc., can solve the problems of inability to meet, inhibit the application field, affect the uniform dispersion of fumed silica, and achieve the effect of improving quality

Active Publication Date: 2009-07-01
GUANGZHOU HUIFU RES INST CO LTD +1
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Problems solved by technology

However, because the surface of the product contains a large amount of silanol (Si-OH), it is easy to form hydrogen bonds, which makes the product extremely hydrophilic, which affects the uniform dispersion of fumed silica in organic polymers, and cannot meet the special requirements of some industries. needs, which greatly inhibits the application field of the product

Method used

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  • Method for preparing hydrophobic type nano silicon dioxide thruogh continuous surface treatment
  • Method for preparing hydrophobic type nano silicon dioxide thruogh continuous surface treatment

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Experimental program
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Embodiment Construction

[0012] Such as figure 1 As shown, the hydrophilic nano-silica gas-solid mixture transported by gas from the raw material warehouse enters the surface treatment furnace 2 through the rotary feeding valve 1, and the solid silica powder enters the furnace body under the action of pressure difference and weight. , and the gas with part of the silicon dioxide powder flows back to the top of the silo through the return pipe 10 again to realize material circulation. On the premise that the amount of silicon dioxide transported by the pipeline is excessive, by controlling the pressure difference between the feeding pipe and the surface treatment furnace 2 and the rotating speed of the rotary feeding valve, the powder metering can be ensured to be transported into the furnace body smoothly and accurately.

[0013] The silicon dioxide powder entering the surface treatment furnace 2 first enters the atomizing device 3 placed on the top of the treatment furnace. Under the action of gravi...

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Abstract

The invention discloses a method for preparing hydrophobic nano-silicon dioxide through continuous surface treatment. In the method, hydrophilic nano-silicon dioxide is continuously fed into a surface treatment furnace and a continuously supplied silane-based surface treatment agent is placed in the surface treatment furnace. Internal reaction, by controlling the type of surface treatment agent, the ratio of reaction materials, reaction temperature and reaction time to prepare hydrophobic nano-silica with a hydrophobic rate of 10-99.99%, so as to be suitable for different application fields and improve the performance of nano-silica. silicon quality.

Description

technical field [0001] The invention relates to a method for preparing hydrophobic nano silicon dioxide. Background technique [0002] Due to its unique physical and chemical properties, nano-silica is widely used in the fields of rubber, plastics, coatings, paint inks, adhesives, cosmetics, medicine, agriculture, etc., for reinforcement, thickening, thixotropy, extinction, and anti-settling , anti-sagging and anti-aging effects. Nano-silica is obtained by using organosilicon halides (such as silicon tetrachloride, methyltrichlorosilane, etc.) Silica, also known as fumed silica or fumed silica. The silica product obtained by this method has high purity (silica content is greater than 99.8%), the primary particle size of the product is between 7 and 40nm, and the specific surface area is 100 to 400m 2 / g, has excellent reinforcing, thickening and thixotropic properties. However, because the surface of the product contains a large amount of silanol (Si-OH), it is easy to f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/28C09C3/12
Inventor 王跃林刘莉龙成坤徐宁
Owner GUANGZHOU HUIFU RES INST CO LTD
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