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Large-pore-volume silicon dioxide with nanoparticle structure and preparation method thereof

A nanoparticle and silica technology, which is applied in the field of preparation of macroporous silica, can solve the problems of uncontrolled average particle size and so on.

Active Publication Date: 2011-08-10
广州凌玮科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method disclosed in U5625023 is that potassium or sodium water glass and inorganic acid are mixed through a special nozzle to form a hydrogel, and then washed with water and dried to obtain a specific surface area of ​​10-1000m 2 / g, pore volume: 0.5-2.5ml / g, a silica product with a pore size of 40-200?, a method for preparing silica with a large pore volume is disclosed in the patent US3959174, which adds a hydrophobic agent to water glass (including inorganic ammonia salts, inorganic sodium salts and potassium salts, organic alcohols, ketones and other small molecular substances) react at room temperature, adjust the pH value at 10-11, continue to add acid to PH3-10 after aging, and heat up to 90 ° C Aging, then washing, drying, and crushing to obtain large-pore silica with a pore volume of 1.2-3.0. This patent restricts the size of the pore volume, but the size and secondary The average particle size of the particles is not controlled, but the size of the primary particles and the average particle size of the secondary particles of silica used as coating matting agents, thickeners, inkjet printing media adsorption materials, heat insulation materials, plastic opening agents, etc. Performance plays a decisive role

Method used

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  • Large-pore-volume silicon dioxide with nanoparticle structure and preparation method thereof
  • Large-pore-volume silicon dioxide with nanoparticle structure and preparation method thereof
  • Large-pore-volume silicon dioxide with nanoparticle structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: do seven parallel sample experiments:

[0019] Each preparation weight percent concentration is 6% sodium silicate solution 1000g and the weight percent concentration is 15% sulfuric acid solution 300g; Add dispersant fatty alcohol and ethylene oxide condensate 10g, react, and the reaction time is controlled at After 3 hours, add sulfuric acid to adjust the pH value to 3-4; raise the temperature of the material to 80°C for thermal activation treatment. The primary particle is controlled at 8-10nm, and then washed with water, spray-dried and cut into an average of 5-6 microns by using supersonic airflow. Its product properties are shown in Table 1:

[0020] Table 1

[0021]

Embodiment 2

[0022] Embodiment 2: do seven parallel sample experiments:

[0023] Each prepared 1000g of sodium silicate solution with 12% silicon dioxide content, reacted with 200g of solution with 10% sulfuric acid content and added 40g of polyethylene glycol at the same time, the reaction time was controlled at 5 hours, and then added sulfuric acid pH value For 3-4, heat the material to 100°C for thermal activation. Control the primary particles to 10-15nm, then wash with water, spray dry and use supersonic airflow to cut the dried particles into an average of 5-6 microns. The product properties are shown in Table 2:

[0024] Table 2

[0025]

Embodiment 3

[0026] Embodiment 3: do seven parallel sample experiments:

[0027] Prepare 1000g of sodium silicate solution with a silicon dioxide content of 12% for each, react with 250g of a sulfuric acid solution with a prepared content of 15%, and add 30g of glycerol oleate at the same time. The reaction time is controlled at 2 hours, and the pH is adjusted by adding sulfuric acid. The value is 3-5 warming up to 90°C for thermal activation. Control the primary particles to 10-15nm, wash with water, spray dry and use supersonic airflow to cut the dried particles into an average of 5-6 microns. The product properties are shown in Table 3:

[0028] table 3

[0029]

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Abstract

The invention discloses large-pore-volume silicon dioxide with a nanoparticle structure and a preparation method thereof. The large-pore-volume silicon dioxide is a product obtained by performing reaction, thermal activation, washing and supersonic air current cutting on alkaline silicate, a sulfuric acid solution and a dispersant serving as raw materials. The silicon dioxide content (dry base) is over 99.0, the BET specific surface area is between 280 m<2> / g and 450 m<2> / g, the void volume is between 2.0 and 3.6, the secondary particle average particle size is between 5 mum and 6 mum, and the primary particle size is between 10 nanometers and 15 nanometers. The average particle size, pore volume and specific surface area of a product produced with the preparation method are controllable; and large-pore-volume silicon dioxide products with different performances can be prepared according to different uses.

Description

technical field [0001] The invention relates to a method for preparing large-volume silicon dioxide with a nanoparticle structure. Background technique [0002] It has been known for a long time to use large pore volume silica as coating matting agent, thickener, inkjet printing medium adsorption material, plastic opening agent, thermal insulation material, etc. There are precipitation method and sol-gel method. The large pore volume silica prepared by precipitation method has unstable pore characteristics, resulting in unstable product quality. US5231066, US5895770, US5372983, etc. The method disclosed in U5625023 is that potassium or sodium water glass and inorganic acid are mixed through a special nozzle to form a hydrogel, and then washed with water and dried to obtain a specific surface area of ​​10-1000m 2 / g, pore volume: 0.5-2.5ml / g, a silica product with a pore size of 40-200?, a method for preparing silica with a large pore volume is disclosed in the patent US395...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B82Y40/00
Inventor 胡湘仲胡伟民
Owner 广州凌玮科技股份有限公司
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