Preparation method of nano SiO2

A nano-silicon dioxide and silicate technology, applied in the direction of silicon dioxide, silicon oxide, nanotechnology, etc., can solve the problems of environmental pollution, the inability to recycle or recycle salt-containing and acid-containing wastewater, and the consumption of inorganic acids. The effect of reducing manufacturing costs, reducing direct production costs, and reducing emissions

Inactive Publication Date: 2012-08-15
ZHEJIANG YUDA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, although the above-mentioned process has solved the problem of replacing expensive raw materials with cheap materials, it has brought about the need to consume a large amount of inorganic acid, produce a large amount of salty and acidic waste water that cannot be recycled or recycled, and simultaneously cause problems such as environmental pollution.

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  • Preparation method of nano SiO2
  • Preparation method of nano SiO2

Examples

Experimental program
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Embodiment 1

[0060] Take a sodium silicate with a Baume degree of 37°Be' (20°C, the same below), add 4 times the amount (weight, the same below) of water to dilute, filter, and measure the diluent containing SiO 2 %=5.0%, Na 2 O%=1.4%, its modulus n=3.7, weighs 600g of this dilute solution, mixes with 600g 3.8% NaHCO under stirring 3 The solution is mixed (the reaction molar ratio is 1:2.0), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 15 minutes, filter, wash the precipitate with water until the washing water is nearly neutral, drain, wash the precipitate with ethanol, drain, dry in an oven, and then pulverize to obtain about 27.5g of nano-silica finished product .

[0061] The clear water is tap water or deionized water.

Embodiment 2

[0063] Take a sodium silicate with a Baume degree of 40°Be', add 3 times the amount of water to dilute, filter, and measure that the diluted solution contains SiO 2 % = 7.3%, Na 2 O%=2.3%, its modulus n=3.3, take by weighing 400g of this dilute sodium silicate solution, mix with 450g NaHCO containing 6.1% under stirring 3 The solution is mixed (the reaction molar ratio is 1:2.2), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 15 minutes, filter, wash the precipitate with water 2-3 times, and then use a small amount of NH 4 HCO 3 Wash the precipitate with water for 2-3 times, then wash the precipitate with clean water until the washing water is nearly neutral, drain, then wash the precipitate with isopropanol several times, drain, dry in an oven, and then pulverize to obtain nano-dioxide The silicon finished product is about 27.5g.

Embodiment 3

[0065] Take a sodium silicate with a Baume degree of 50°Be', add 4 times the amount of water to dilute, filter, and measure that the diluted solution contains SiO 2 %=5.8%, Na 2 O% = 2.6%, its modulus n = 2.3, weigh 500g of this kind of dilute sodium silicate solution, mix it with 500g of NaHCO containing 7.4% under stirring 3 The solution is mixed (the reaction molar ratio is 1:2.1), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 15 minutes, filter, wash the precipitate with water 2-3 times, and then use a small amount of H 2 SO 4 Wash the precipitate with water for 2-3 times, then wash the precipitate with water until the washing water is nearly neutral, drain it, add it to n-butanol, use azeotropic distillation to remove the water contained in the filter cake, stop heating after the distillation is completed, and cool After reaching normal temperature, use a Buchner funnel to suction filter, put the filter cake in an oven to dry, ...

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Abstract

The invention discloses a preparation method of nano SiO2. The preparation method is characterized by taking soluble silicate M2O.nSiO2 and hydrocarbonate MHCO3 as raw materials to obtain hydrate SiO2 through precipitation, separating out filtrate through filtration, then washing the filter cake, displacing the filter cake with an organic solvent and drying and grinding the product to obtain the nano SiO2 product, wherein the filtrate mainly contains carbonate M2CO3 and little hydrocarbonate MHCO3; and M in the soluble silicate M2O.nSiO2, hydrocarbonate MHCO3 and carbonate M2CO3 is an alkali metal Na or K. The preparation method has the following beneficial effects: the filtrate mainly contains carbonate M2CO3 and little hydrocarbonate MHCO3 and the reaction raw materials can be obtained through different processing modes, so the materials can be recycled, thus the preparation cost is reduced, fewer resources are consumed, emission is reduced, and the problems of environmental pollution and the like because plenty of inorganic acids need to be consumed in the prior art are avoided.

Description

technical field [0001] The invention relates to a method for preparing nano silicon dioxide, which belongs to the technical field of new chemical materials. Background technique [0002] Nano silicon dioxide (nm-SiO 2 ) is an amorphous silica product with a particle size of nanoscale (generally 1-100nm). Its appearance is white powder. It is a non-toxic, odorless, and non-polluting non-metallic oxide material. The quasi-granule spherical structure, because of its small size, large specific surface area, high surface energy, high interface energy in contact with polymers, and superior stability, reinforcement, thickening and thixotropy, is used in many It has a very wide range of applications, especially in rubber, special coatings, textile industry, resin-based composite material modification and other application fields, which are increasingly showing its irreplaceable role. [0003] At present, nm-SiO is produced 2 There are mainly two kinds of methods: dry method and w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B82Y40/00
Inventor 章浩龙
Owner ZHEJIANG YUDA CHEM IND
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