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Process for preparing size-controllable nano-silicon dioxide

A nano-silicon dioxide and size technology, applied in the preparation of silicon dioxide, silicon oxide, oxide/hydroxide, etc., can solve the problems of poor cooling effect, sintering into large particles, and difficult size, so as to improve the cooling effect. Efficiency and effect of preventing particle size increase

Inactive Publication Date: 2004-11-17
GUANGZHOU GBS HIGH TECH & IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the production process of fumed silica, the cooling of the combustion chamber is a key process, because in the process of silica preparation, the reaction temperature is basically above 1700°C (above the melting point of silica), and immediately after the reaction is completed Keep the temperature in the reaction chamber below 800°C, otherwise the formed silica particles are likely to collide with each other and sinter into large particles, and if the cooling rate is too slow, it is easy to form crystalline silica and affect the performance of the product
The traditional method is to use air cooling, the cooling effect is poor, and the temperature in the reaction chamber is not easy to control, so it is difficult to effectively control the size of the primary silica particles, the particle size distribution is wide, and the yield of fumed silica is relatively low

Method used

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  • Process for preparing size-controllable nano-silicon dioxide
  • Process for preparing size-controllable nano-silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Methyltrichlorosilane at 7.5m 3 / h, hydrogen at 12m 3 / h, air at 105m 3 The supply of / h is continuously delivered to the premixer for premixing (the above volume is the standard volume), and then enters the nozzle of the combustion furnace after preheating to 120°C. The specific process is shown in Figure 1. The temperature in the reaction chamber is 720°C. The temperature in the primary deacidification furnace is 600°C, the temperature in the secondary deacidification furnace is 550°C, the auxiliary gas for deacidification is water vapor and nitrogen, and the temperature is 230°C. The quality indicators of the prepared silica are as follows:

[0023] Silica content (%) (hydrofluoric acid method) 99.85

[0024] Primary particle average particle size (nm) (electron microscope method) 30

[0025] Specific surface area (m2 / g) (BET method) 153

[0026] PH value (4% water suspension) 3.95

[0027] Carbon content (%) 0.01

Embodiment 2

[0029] The methyl trichlorosilane of embodiment 1 is replaced with silicon tetrachloride, and silicon tetrachloride is 7m 3 / h, hydrogen at 15m 3 / h, air at 130m 3 The supply of / h is supplied, the process is the same as in Example 1, and the temperature in the reaction chamber is 640° C., and the others are the same as in Example 1. The quality index of the prepared silica is as follows:

[0030] Silica content (%) (hydrofluoric acid method) 99.85

[0031] Primary particle average particle size (nm) (electron microscopy) 12

[0032] Specific surface area (m 2 / g) (BET method) 283

[0033] PH value (4% water suspension) 4.05

[0034] Carbon content (%) Not determined

Embodiment 3

[0036] The methyltrichlorosilane in Example 1 is replaced with 60% methyltrichlorosilane and 40% silicon tetrachloride, and the supply is 8.5m 3 / h, hydrogen is 16m 3 / h, the air is 125m 3 / h, the temperature in the reaction chamber is 690°C, and other process parameters are the same as in Example 1, and the quality index of the prepared silicon dioxide is as follows:

[0037] Silica content (%) (hydrofluoric acid method) 99.82

[0038] Primary particle average particle size (nm) (electron microscopy) 15

[0039] Specific surface area (m 2 / g) (BET method) 208

[0040] PH value (4% water suspension) 4.23

[0041] Carbon content (%) 0.01

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Abstract

The invention provides a process for preparing dimension controllable nano silicon dioxide comprising continuously conveying organic halogensilane, hydrogen, and oxygen by a finite proportion into combustion nozzle then firing chamber, conducting hydrolytic reaction in 1000 deg. C to 2000deg. C flame, subjecting the reaction product to congregation, cyclone air-solid segregation and deacidification post-treatment, and vacuum-packing.

Description

Technical field [0001] The utility model relates to a preparation method of 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. At present, the method for preparing nano-silica can be divided into two types, one is the wet method, which uses a silicate solution (such as sodium silicate) to hydrolyze under acidic or alkaline conditions, and then undergoes a series of post-treatment processes to obtain Silica, also known as precipitated silica. The other is the dry method, using organosilicon halides (such as silicon tetrachloride, methyltrichlorosilane, etc.) Process to obtain silica, also known as fumed silica or fumed silica. There are some differences in the properties of silica p...

Claims

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Application Information

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IPC IPC(8): C01B13/14C01B33/12C01B33/18
Inventor 王跃林杨本意张平邹军辉段先健
Owner GUANGZHOU GBS HIGH TECH & IND
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