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Method for coating modified superfine ceramic powder by polyurethane

A technology of ceramic powder and polyurethane, which is applied in the field of colloid chemistry, can solve the problem of inability to improve the dispersibility of nano powder, and achieve the effects of no toxic side effects, simple process and easy operation.

Active Publication Date: 2013-02-06
江苏先进无机材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, relying solely on the role of dispersants cannot improve the dispersion of nano-powders and prepare ceramic slurry with high solid content.

Method used

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  • Method for coating modified superfine ceramic powder by polyurethane
  • Method for coating modified superfine ceramic powder by polyurethane

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Add 150 g of alumina powder (average particle size: 0.18 μm) and 100 ml of ethanol into a ball mill jar, and ball mill for 10 minutes to obtain alumina slurry. Take 4.5 g of one-component polyurethane (CCW-525) and add it to the alumina slurry, and continue ball milling for 1 hour. Pour the alumina slurry into a tray and dry in an oven for at least 12 hours to complete dryness at 70°C.

example 2

[0029] Add 150 g of alumina powder (average particle size: 0.18 μm) and 100 ml of ethanol into a ball mill jar, and ball mill for 10 minutes to obtain alumina slurry. Take 3g of component A of the two-component polyurethane (HY-010) and add it to the aluminum nitride slurry, and continue ball milling for 1 hour. Pour the alumina slurry into a beaker, and add 1.5 g of component B of the two-component polyurethane while stirring. Stirring was continued for 1 hour. After the slurry is filtered, it is dried in an oven for at least 12 hours to be completely dry at a temperature of 70°C.

example 3

[0031] Add 150 g of yttrium oxide powder (average particle size: 0.12 μm) and 100 ml of ethanol into a ball mill jar, and ball mill for 10 minutes to obtain yttrium oxide slurry. Take 4.5 g of polyol-modified one-component polyurethane and add it into the yttrium oxide slurry, and continue ball milling for 1 hour. Pour the yttrium oxide slurry into the tray and dry in an oven for at least 12 hours to complete dryness at 70 °C.

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Abstract

The invention relates to a method for coating a modified superfine ceramic powder by polyurethane. The method is characterized by comprising the following steps of: enriching the polyurethane on the surface of the ceramic powder through a physical absorption and chemical adsorption mode of the polyurethane on the surface of the ceramic powder; after a curing agent is added, forming a firmer organic film layer on the surface of the ceramic powder, so as to achieve a surface modification purpose. The adding quantity of the polyurethane is 0.2-1 % of the weight of the ceramic powder. The adding quantity of the curing agent is 2-50 % of the weight of the polyurethane. The method provided by the invention has the outstanding advantages as follows: the dispersiveness of the surface modified ceramic powder is enhanced and a ceramic paste with high solid content can be prepared; the polyurethane has no toxic and side effect; the polyurethane can removed through a calcining method; no impurity remains; and no influence on the sintering of the ceramic is caused.

Description

technical field [0001] The invention relates to a method for wrapping modified ultrafine ceramic powder with polyurethane, which belongs to the field of colloid chemistry. technical background [0002] Wet molding is an important molding process for preparing ceramics, such as: gel casting molding, grouting molding, tape casting, injection molding, etc. These molding methods have high requirements on the fluidity and dispersion of the ceramic slurry. Among them, the solid content of the ceramic slurry used for gel casting and tape casting should be as high as possible. However, the prerequisite is to ensure that the slurry The fluidity of the material is convenient for pouring and slurry transfer. On the other hand, in order to promote the sintering of ceramics and reduce the sintering temperature, researchers generally use nanoscale ceramic powders. The dispersion of nano-ceramic powder is more difficult. Such as: alumina powder used to prepare transparent ceramics, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628
Inventor 董满江薛剑峰
Owner 江苏先进无机材料研究院