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Ultrafine high-oil-absorption food-grade silica preparation method and product thereof

A technology of silicon dioxide and oil absorption value, applied in the directions of silicon dioxide, silicon oxide, chemical instruments and methods, etc., can solve the problems of low product purity, small specific surface area, poor uniformity, etc., and achieve uniform particle size distribution, The particle size is uniform and the effect of improving the oil absorption value

Pending Publication Date: 2019-06-21
TIANJIN LONGHUA CHENGXIN POWDER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the product obtained by the traditional precipitation method has low purity, poor uniformity, small specific surface area, and poor quality compared to the other four methods. Therefore, it is necessary to improve the traditional precipitation method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Using sodium silicate as the silicon source, mix 4.5gNa2SiO3·9H2O with 50ml of distilled water, add to a mixer, stir at a speed of 800r / min, control the temperature at 22°C, and stir for 30min to obtain a mixed bottom liquid, and let it stand at room temperature for 36h ;The mixture of 0.2g n-octanol and straight-chain dodecanol is added to the mixed bottom liquid, and ultrasonic treatment is performed to fully disperse the mixture of n-octanol and straight-chain dodecanol to obtain a solution; then in the solution Slowly add sulfuric acid solution, the concentration of sulfuric acid solution is 5mol / L, and adjust the pH value to 7; stir the adjusted solution in the mixer at a speed of 700r / min for 30min, and control the temperature at 55°C; add distilled water, and adjust the concentration of sodium silicate Adjust to 0.2g / ml, stir at a speed of 250r / min for 6h, then perform ultrasonic treatment for 1h, and age for 4h; add octylphenol polyoxyethylene ether OP-10 to the ...

Embodiment 2

[0016] Using sodium silicate as the silicon source, mix 4.5gNa2SiO3·9H2O with 50ml of distilled water, add it to a mixer, stir at a speed of 500r / min, control the temperature at 20°C, and stir for 30min to obtain a mixed bottom liquid, and let it stand at room temperature for 42h ;The mixture of 0.2g n-octanol and straight-chain dodecanol is added to the mixed bottom liquid, and ultrasonic treatment is performed to fully disperse the mixture of n-octanol and straight-chain dodecanol to obtain a solution; then in the solution Slowly add sulfuric acid solution, the concentration of sulfuric acid solution is 4mol / L, adjust the pH value to 7; stir the adjusted solution in the mixer at a speed of 600r / min for 30min, and control the temperature at 50°C; add distilled water to adjust the concentration of sodium silicate Adjust to 0.25g / ml, stir at a speed of 150r / min for 6h, then perform ultrasonic treatment for 1h, and age for 4h; It is dried at 100°C, and then roasted at 500°C to o...

Embodiment 3

[0018] Using sodium silicate as the silicon source, mix 4.5gNa2SiO3·9H2O with 50ml of distilled water, add to a mixer, stir at a speed of 600r / min, control the temperature at 20°C, and stir for 30min to obtain a mixed bottom liquid, and let it stand at room temperature for 40h ;The mixture of 0.2g n-octanol and straight-chain dodecanol is added to the mixed bottom liquid, and ultrasonic treatment is performed to fully disperse the mixture of n-octanol and straight-chain dodecanol to obtain a solution; then in the solution Slowly add sulfuric acid solution, the concentration of sulfuric acid solution is 4.5mol / L, and adjust the pH value to 6; stir the adjusted solution in the mixer at a speed of 600r / min for 30min, and control the temperature at 50°C; add distilled water, and mix the sodium silicate Adjust the concentration to 0.15g / ml, stir at a speed of 150r / min for 6h, then perform ultrasonic treatment for 1h, and age for 4h; add hexadecyltrimethylammonium bromide to the prec...

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Abstract

The invention discloses an ultrafine high-oil-absorption food-grade silica preparation method and a product thereof. The preparation method comprises: mixing 4.5 g of Na2SiO3.9H2O as a silicon sourceand 50 ml of distilled water, and stirring to obtain a mixed substrate solution; adding 0.2 g of an alcohol-based auxiliary agent to the mixed substrate solution, and carrying out ultrasonic treatmentto obtain a solution; slowly adding a sulfuric acid solution into the solution in a dropwise manner, and adjusting the pH value to 6-7; adding distilled water, adjusting the concentration of sodium silicate to 0.15-0.25 g / ml, carrying out ultrasonic treatment for 1 h, and aging for 4 h; and adding a surfactant to the precipitate, washing with an ethanol solution, drying, and calcining to obtain the ultrafine high-oil-absorption food-grade silica. According to the present invention, during the preparation, the pore volume and the oil absorption value of ultrafine silica are increased by addingthe mixture of n-octanol and straight chain dodecanol, the surfactant makes silica have good particle shape and uniform particle size distribution, and the use of ultrasonic treatment makes ultrafinesilica have characteristics of good dispersibility, uniform particle size and no agglomeration.

Description

technical field [0001] The invention relates to the technical field of silicon dioxide, in particular to a preparation method and product of superfine food-grade silicon dioxide with high oil absorption value. Background technique [0002] Silica is a high-tech inorganic fine chemical, which exhibits good hydrophilicity due to its unusual particle characteristics, namely extremely small particle size, large specific surface area and excellent chemical properties , Reinforcing, thickening, matting and anti-adhesive properties, so it is widely used in the fields of rubber, paint, medicine, ink and food, and is an indispensable raw material in industry and life. At present, the methods for preparing food-grade silica can be divided into dry method and wet method. The dry method includes gas phase method and arc method, and the wet method mainly includes microemulsion method, gel method and precipitation method. The chemical precipitation method has the advantages of cheap and ...

Claims

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Application Information

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IPC IPC(8): C01B33/18B01J20/10B01J20/28B01J20/30
Inventor 孙维习
Owner TIANJIN LONGHUA CHENGXIN POWDER TECH
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