Method for preparing inorganic crystal whisker with SiO2-coated surface

A technology of inorganic whiskers and surface coating, which is applied in the field of preparation of SiO2 coated on the surface of inorganic whiskers, can solve problems such as difficulty in operation control, and achieve the effects of high application value, simple and easy operation, and remarkable surface modification effect.

Inactive Publication Date: 2005-01-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the actual operation and control difficulties of the prior art methods, and to provide an inorganic whisker surface-coated SiO 2 The preparation method makes it easy to operate, and the obtained whisker coating layer is dense and uniform, and the thickness is controllable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Dispersion treatment of potassium titanate whiskers: according to the coating amount of 5% (SiO 2 Mass ratio to potassium titanate whiskers) Weigh sodium silicate, dissolve in water 10 times the mass of the whiskers to make a dilute solution, add potassium titanate whiskers to the solution, and ultrasonically disperse for 10 minutes to obtain dispersion A ;

[0015] (2) Potassium titanate whiskers coated with SiO 2 Membrane: Weigh ethyl acetate according to 1 times the amount of sodium silicate, slowly drop it into the dispersion A, and keep it at 60°C for 4 hours while stirring;

[0016] (3) Post-coating treatment: after the reaction is completed, the product is filtered, washed once, filtered and dried to obtain the final product.

[0017] Test results: the actual coating amount is 4.69%, and the thickness is about 50nm

Embodiment 2

[0019] (1) Dispersion treatment of potassium titanate whiskers: according to the coating amount of 10% (SiO 2 Mass ratio to potassium titanate whiskers) Weigh sodium silicate, dissolve in water 10 times the mass of the whiskers to make a dilute solution, add potassium titanate whiskers to the solution, and ultrasonically disperse for 10 minutes to obtain dispersion A ;

[0020] (2) Potassium titanate whiskers coated with SiO 2 Membrane: Ethyl acetate is weighed according to 3 times the amount of sodium silicate, slowly dropped into the dispersion A, and aged at 20°C for 24 hours under stirring;

[0021] (3) Post-coating treatment: after the reaction is completed, the product is filtered, washed once, filtered and dried to obtain the final product.

[0022] Test results: the actual coating amount is 9.62%, and the thickness is about 100nm

Embodiment 3

[0024] (1) Dispersion treatment of calcium sulfate whiskers: 20% by coating amount (SiO 2 Mass ratio to calcium sulfate whiskers) Weigh sodium silicate, dissolve in water 10 times the mass of the whiskers to make a dilute solution, add calcium sulfate whiskers to the solution, and ultrasonically disperse for 10 minutes to obtain dispersion A;

[0025] (2) Calcium sulfate whisker surface coated with SiO 2 Membrane: Ethyl acetate was weighed according to 6 times the amount of sodium silicate, slowly dropped into the dispersion A, and aged at 70°C for 4 hours under stirring;

[0026] (3) Post-coating treatment: after the reaction is completed, the product is filtered, washed once, filtered and dried to obtain the final product.

[0027] Test results: the actual coating amount is 18.92%, and the thickness is about 200nm

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Abstract

Disclosed is a method for preparing inorganic crystal whisker with SiO2-coated surface which comprises, subjecting the inorganic crystal whisker to decentralized processing in precursor solution, carrying out inorganic coating by employing homogeneous precipitation method, thermal insulating and ageing, filtering, scouring, and drying to obtain the inorganic crystal whisker with SiO2-coated surface.

Description

technical field [0001] The invention relates to a method for surface treatment of inorganic whiskers, in particular to a method for coating the surface of inorganic whiskers with SiO 2 method of preparation. Used in the field of material preparation. Background technique [0002] Due to the high surface energy of inorganic whiskers, they are easy to agglomerate, and the number of surface active groups is relatively small, which makes the interfacial compatibility between the prepared composite material and the matrix unsatisfactory, thus affecting the performance. Therefore, the surface treatment of inorganic whiskers is a difficult and hot spot in the research of whisker composite materials. At present, the effect of the direct coupling method used by most researchers is usually not ideal. If the active inorganic material can be coated on the surface of the potassium titanate whisker, the abundant hydroxyl groups on the surface of the active inorganic material can be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628C04B35/81C30B29/62C30B33/00
Inventor 郭明波徐宏古宏晨
Owner SHANGHAI JIAO TONG UNIV
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