Method for preparing hydrophobic nano-silica with controllable grain diameter

A nano-silica, hydrophobic technology, applied in the direction of dyeing organosilicon compound treatment, fibrous filler, etc., can solve the problems of high roasting temperature, different product properties, and high energy consumption, and achieves simple method and enhanced function. , the effect of enhancing dispersibility

Inactive Publication Date: 2010-11-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

For example, the gas phase method has a small concentration of substances and less agglomeration of the generated particles, but the preparation and roasting temperature is high, the energy consumption in the production process is high, the cost is high, and the pollution is large; the precipitation method has different reaction media, reaction ratios, and process conditions. Very different, difficult to control

Method used

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  • Method for preparing hydrophobic nano-silica with controllable grain diameter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] After mixing 4g of ammonia water (20% by mass) and 2g of water, add it to 150g of absolute ethanol, stir and heat up to 70°C, and stir for 0.5 hours; further add 6g of ethyl orthosilicate dropwise to the above solution , the dropping speed was 0.8g / min, after the dropwise addition, the reaction was kept for 2 hours, and 2.5g of methyltriethoxysilane was further added dropwise, and the reaction was kept for 18 hours. Then filter, wash, and dry to obtain hydrophobic nano-silica, the properties of which are shown in Table 1.

Embodiment 2

[0022] After mixing 4g of ammonia water (28% by mass) and 6g of water, add it to 100g of absolute ethanol, stir and heat up to 50°C, and stir for 1 hour; further add 6g of ethyl orthosilicate dropwise to the above solution , a dropping rate of 0.5g / min, after the dropwise addition, the reaction was kept for 2 hours, and 3.5g of methyltriethoxysilane was further added dropwise, and the reaction was kept for 18 hours. Then filter, wash, and dry to obtain hydrophobic nano-silica, the properties of which are shown in Table 1.

Embodiment 3

[0024] After mixing 5g of ammonia water (25% by mass) and 7g of water, add it to 100g of absolute ethanol, stir and heat up to 60°C, and stir for 1 hour; further add 6g of tetraethyl orthosilicate dropwise to the above solution , the dropping rate was 1.0g / min, after the dropwise addition, the reaction was kept for 3 hours, and 2.5g of ethyltriethoxysilane was further added dropwise, and the reaction was kept for 20 hours. Then filter, wash, and dry to obtain hydrophobic nano-silica, the properties of which are shown in Table 1.

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Abstract

The invention discloses a method for preparing hydrophobic nano-silica with a controllable grain diameter. The method comprises the following steps of: adding ammonia water and water into absolute ethanol and stirring the mixture for 0.5 to 1 hour at the temperature of between 20 and 70 DEG C; under an alkali condition, performing hydrolytic polycondensation to obtain nano-silica by using the absolute ethanol as solvent and tetraethoxysilane as a raw material; and preparing the hydrophobic nano-silica with the grain diameter in the range of between 20 and 500 nm by using a silane coupling agent as a hydrophobic modifier, wherein the using amount of ammonia water is 40 to 100 percent of the weight of the tetraethoxysilane; the using amount of the absolute ethanol is 12 to 25 times the weight of the tetraethoxysilane; and the using amount of the water is 30 to 150 percent of the weight of the tetraethoxysilane. The preparation method has the advantages of simpleness, easy operation and mild reaction condition. The hydrophobic nano-silica with the controllable grain diameter can be prepared by adjusting proportion and technological parameters of the materials.

Description

technical field [0001] The invention relates to a method for preparing functional nanometer silicon dioxide, specifically a method for preparing hydrophobic nanometer silicon dioxide with a controllable particle size by a sol-gel method, and belongs to the field of preparation of functional nanometer materials. Background technique [0002] Nano-silica is one of the extremely important high-tech ultra-fine inorganic new materials. Because of its small particle size and large specific surface area, it has specific properties in terms of thermal resistance and electrical resistance. Strength, thickening performance and thixotropy play an irreplaceable role in many disciplines and fields. Nano-silica is widely used as an additive, catalyst carrier, decolorizer, matting agent, rubber reinforcing agent, plastic filler, ink thickener, metal soft polishing agent, insulating filler, etc. And spraying materials, medicine, environmental protection and so on. However, due to the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/12
Inventor 郑大锋周耿槟皮丕辉黄二梅文秀芳蔡智奇程江杨卓如
Owner SOUTH CHINA UNIV OF TECH
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