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Preparation method of epoxy resin coated ceramic powder

A technology of epoxy resin and ceramic powder, which is applied in the field of rapid prototyping, can solve problems such as prolonged degreasing time, voids in the blank, and increased cost, and achieves the effects of reducing content, increasing strength, and requiring less equipment

Active Publication Date: 2014-02-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The easiest way to increase the strength of the initial form is to increase the content of the polymer binder. However, since the binder is finally removed at high temperature, that is, after degreasing, the high binder content often causes the form to form a large amount after degreasing. Voids, which result in unacceptable shrinkage of the final part, and may cause parisons to collapse during debinding
Another problem caused by high binder content is the extended degreasing time, resulting in lower efficiency and higher cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The invention provides a preparation method of epoxy resin coated ceramic powder, the steps of which are:

[0021] 1) Put ceramic powder and epoxy resin into a jacketed stainless steel reaction kettle, add a sufficient amount of solvent, seal the reaction kettle and the acetone volatilization collection device connected to it, and protect it with nitrogen gas; among them, the ceramic powder can be For: alumina, silicon carbide, zirconia and other ceramic powders, the mass ratio of epoxy resin to ceramic powder can be selected according to needs, but not less than 1:19, the solvent is acetone, and the amount added should be enough to stir the reactor Place the head below the liquid level of acetone, generally 4000ml-7000ml; raise the temperature in the kettle from room temperature to 40-50°C after 0.5-1 hour, and mechanically stir while raising the temperature to completely dissolve the epoxy resin in acetone. Stir to disperse the ceramic powder evenly in the acetone sol...

Embodiment 1

[0024] Example 1 Preparation of Epoxy Resin Coated Aluminum Oxide Powder

[0025] (1) Put epoxy resin E06 and alumina powder (FC-A type, Baikowski Company, France) into the reaction kettle at a mass ratio of 1:2, add 4000ml of solvent acetone (analytical grade, Tianjin Baoxifeng Company), and react The kettle and the acetone volatilization collection device connected to it are sealed as a whole and protected by nitrogen gas. Raise the temperature in the kettle from room temperature to about 40-50°C after 0.5 hours to 1 hour, and mechanically stir while raising the temperature to completely dissolve the epoxy resin in acetone, and vigorously stir to make the aluminum oxide evenly dispersed in the acetone of the epoxy resin In the solution, keep warm for 1 hour to 2 hours. During the heat preservation process, the acetone is directly volatilized, and the acetone is recovered through the volatilization collection device;

[0026] (2) After 2 hours to 3 hours, the kettle is coole...

Embodiment 2

[0027] Embodiment 2 prepares silicon carbide powder coated with epoxy resin

[0028] (1) Put epoxy resin E06 and silicon carbide powder into the reaction kettle at a mass ratio of 1:3, add 4000ml of solvent acetone, seal the reaction kettle and the acetone volatilization collection device connected to it, and ventilate nitrogen for protection. Raise the temperature in the kettle from room temperature to 40-50°C after 0.5-1 hour, and mechanically stir at the same time, so that the silicon carbide is evenly dispersed in the acetone solution of epoxy resin, and keep warm for 1-2 hours. In the process, acetone is directly volatilized, and it is recovered through a volatilization collection device;

[0029] (2) After 2 hours to 3 hours, the kettle is cooled to room temperature, so that the epoxy resin gradually takes the silicon carbide powder as the nucleus, and crystallizes on its surface to form an epoxy resin-coated silicon carbide powder aggregate. Take the composite powder a...

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PUM

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Abstract

The invention discloses a preparation method of epoxy resin coated ceramic powder, which comprises the following steps: ceramic powder, an epoxy resin and an acetone solvent are proportionally added into a reaction kettle, the sealed reaction kettle is heated and mechanically stirred, and the acetone is directly volatilized and recovered in the thermal insulation process; in the cooling process, the epoxy resin crystal is coated on the surface of the ceramic powder; and the powder is taken out of the reaction kettle, naturally dried, ground and screened to obtain the final epoxy resin coated ceramic powder material. The method is beneficial to enhancing the strength of the initial blank, lowers the adhesive content, has the advantages of favorable coating effect, simple technique and low facility request, and can not pollute the environment.

Description

technical field [0001] The invention relates to the technical field of rapid prototyping, in particular to a method for preparing epoxy resin-coated ceramic powder. Background technique [0002] At present, the more researched SLS materials include polymer powder materials, metal powder materials, ceramic powder materials, nanocomposite materials, etc. Among them, the rapid prototyping of ceramic materials is an important development direction of SLS technology. There are four main types of ceramic powder materials researched at this stage: ceramic powder directly mixed with binder, surface-coated ceramic powder, surface-modified ceramic powder, and resin sand. [0003] Generally speaking, the power of the laser equipped with the SLS system is small enough to directly melt the high-melting point ceramic powder, so the indirect method is used to manufacture ceramic parts. The ceramic-based powder material used in this method contains a low-melting point binder, and the laser ...

Claims

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Application Information

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IPC IPC(8): C04B35/628
Inventor 史玉升刘凯夏思婕刘洁李晨辉
Owner HUAZHONG UNIV OF SCI & TECH
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