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Preparation method of silica shear thickening liquid

A technology of silica and monodisperse silica microspheres, applied in the direction of silica, silica, etc., can solve the problem of increasing the preparation cycle of silica shear thickening liquid and affecting the rheological properties of shear thickening liquid , high surface energy of nano-powders, to achieve the effect of shortening the preparation cycle, good consistency, and good monodispersity

Inactive Publication Date: 2013-10-23
浩华科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This independent two-step preparation technology has the following problems: First, because the powder will affect the shape of the powder during the multiple washing, drying and grinding processes, and even part of it will be ground, which will eventually affect the shearing process. The rheological properties of the thickening liquid; secondly, the surface energy of the nano-powder is high, and it is easy to agglomerate during the drying process, which increases the difficulty of redispersion; thirdly, when the shear thickening liquid is prepared by the two-step method, due to the Processes such as washing, drying, grinding and dispersing are required, which increases the preparation cycle of silica shear thickening liquid and increases the production cost

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  • Preparation method of silica shear thickening liquid
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  • Preparation method of silica shear thickening liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Mix 1200ml of methanol and 110ml of ammonia water evenly by means of magnetic stirring, control the temperature at 55°C, add 60ml of TEOS into the mixed solution system, and react to obtain monodisperse silica microsphere seeds.

[0024] (2) Using the multi-stage seed growth method, add 120ml of TEOS and 18ml of deionized water every 7h, a total of 4 times, the silica nuclei gradually grow up, and finally form monodisperse silica microspheres, after the reaction is completed Add 2.3ml of SCA-903 to the system, and the particle size of the prepared silica microspheres is 118nm.

[0025] (3) Add 57g of PEG200 to the silica suspension and mix well.

[0026] (4) The above mixed solution is heated under reduced pressure to remove impurities such as alcohol, water and ammonia to obtain a shear thickening solution.

Embodiment 2

[0028] (1) Using the Stober method, add 1200ml of ethanol, 120ml of ammonia water, and 80ml of deionized water into a clean 2L flask, stir and mix with a magnetic stirrer at a speed of 200r / min, control the temperature at 45°C, add 70ml of TEOS and mix In the solution system, the monodisperse silica microsphere seeds are obtained through the reaction.

[0029] (2) Using the multi-stage seed growth method, first lower the temperature of the above-mentioned silica seed solution system to 40°C, and then add 140ml of TEOS and 22.5ml of deionized water every 7h, a total of 5 times, the silica crystal The nuclei grow gradually, and finally form monodisperse silica microspheres. After the reaction is completed, add 2.3ml of SCA-903 to the system, and the particle size of the prepared silica microspheres is 226nm.

[0030] (3) Add 90g of PEG400 into the silica suspension and mix well.

[0031] (4) The above mixed solution is heated under reduced pressure to remove impurities such as ...

Embodiment 3

[0033] (1) Measure 1200ml of absolute ethanol, 200ml of ammonia water, and 80ml of deionized water into a clean flask, stir for 10 minutes with magnetic force to mix evenly, and the temperature is 30°C, add 100ml of TEOS into the mixed solution system, and react to obtain monodisperse silica Microsphere seeds.

[0034] (2) Using the multi-stage seed growth method, add 200ml of TEOS and 21ml of deionized water every 6h, a total of 6 times, the silica nuclei gradually grow up, and finally form monodisperse silica microspheres, after the reaction is completed Add 2.3ml of SCA-903 to the system, and the particle size of the prepared silica microspheres is 585nm.

[0035] (3) Add 200 g of glycerol to the silica suspension and mix well.

[0036] (4) Heating the above mixed solution under reduced pressure to remove impurities such as ethanol, water and ammonia to obtain a shear thickening solution.

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Abstract

The invention discloses a preparation method of a silica shear thickening liquid. The preparation method comprises the following steps of: preparing monodisperse silica microspheres with certain grain size in an alcohol-water mixed liquid according to a multi-level seed growth method by utilizing tetraethoxysilane serves as a raw material and ammonia as a catalyst; after reaction is finished, adding shear thickening liquid dispersion media (polyethylene glycol, glycerol and the like) into a SiO2 suspension liquid; after mixing uniformly, removing ethanol, water and ammonia from the mixed liquid by adopting a heating and pressure-reducing method to finally prepare the silica shear thickening liquid, wherein the ethanol which is collected under reduced pressure can serve as a solvent and can be reused. In the preparation method, the SiO2 microspheres exist in the form of a uniformly dispersed suspension liquid from the synthesis link to the preparation link of the shear thickening liquid, so the agglomeration phenomenon of powder in drying and redispersion processes is avoided, and the stability and rheological property of the shear thickening liquid are improved.

Description

technical field [0001] The invention relates to a method for preparing a silica shear thickening liquid, in particular, monodisperse silica microspheres are prepared by a multi-stage seed method and then directly mixed with a dispersion medium to form a shear thickening liquid. Background technique [0002] Shear thickening fluid is a new type of intelligent anti-impact material, which is in a liquid state under normal conditions. When subjected to high-speed shear or external force impact, the viscosity and strength of the material increase rapidly, and the liquid state is transformed into a solid state to achieve energy absorption protection. Effect. [0003] The shear thickening liquid is composed of dispersed phase, dispersion medium, various additives, etc., among which the morphology, particle size, particle size distribution, and degree of dispersion of the dispersed phase play a decisive role in its rheological properties. Studies have shown that if the particle siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 王家松李小娟王芬韩跃余勇雷卫武
Owner 浩华科技实业有限公司
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