Plaster mould for ceramic slip casting and manufacturing method of plaster mould

A gypsum mold and grouting molding technology, applied in the field of gypsum mold and its preparation, can solve the problems of poor water absorption performance and low strength, and achieve the effects of improving corrosion resistance and wear resistance, high strength and strong corrosion resistance

Active Publication Date: 2013-10-23
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of low strength and poor water absorption performance of the existing gypsum molds,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The present invention also provides a kind of preparation method of gypsum mold, and this method comprises the following steps:

[0019] S1 uses asphalt as raw material, adds foaming agent and mixes evenly, and foams under the protection of nitrogen atmosphere to prepare porous pitch carbon;

[0020] S2 Prepare gypsum powder and water to make gypsum slurry, mix gypsum slurry with pitch charcoal, stir, cast, and dry to make a gypsum mold.

[0021] According to the preparation method of the gypsum mold provided by the present invention, preferably, the foaming temperature is 350-600°C, the pressure is 2-5MPa, the heating rate is 5-15°C / min, and the temperature is kept at the highest temperature for 2-5h .

[0022] According to the method for preparing a gypsum mold provided by the present invention, preferably, the foaming agent is an inorganic foaming agent and / or an organic foaming agent. More preferably, described inorganic foaming agent is at least one in sodium bic...

Embodiment 1

[0030] 1. Preparation of porous pitch carbon: high-temperature coal tar pitch (softening point 95°C) is used as raw material, ammonium carbonate is used as foaming agent, and the two are mixed evenly at a mass ratio of 100:1. The obtained mixture was foamed in an autoclave to prepare porous pitch carbon. The foaming process was as follows: heating rate 10°C / min, pressure 3MPa, maximum foaming temperature 500°C and heat preservation for 4h. The obtained bituminous charcoal is broken into particles with a particle size of 3-8 mm.

[0031] 2. Preparation of gypsum slurry: gypsum powder with a purity of more than 95% and a particle size of 90-150 mesh (wherein α gypsum powder: β gypsum powder = 80:20) is mixed with water and stirred under the condition of a vacuum of 0.0008MPa. Gypsum slurry, wherein the mass ratio of gypsum powder to water is 1.2:1.

[0032] 3. Preparation of gypsum mold: Take the porous pitch carbon and gypsum slurry prepared by the above method, and mix 35 p...

Embodiment 2

[0035] The gypsum mold was prepared by the same method as in Example 1, except that the foaming agent was replaced with aliphatic amine (1.5wt% added); the foaming process was: heating rate 15°C / min, pressure 2MPa, the highest foaming The temperature is 600° C. and the temperature is kept for 2 hours; in the gypsum slurry, the mass ratio of gypsum powder to water is 1:1; the gypsum mold A2 is prepared.

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PUM

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Abstract

The invention provides a plaster mould for ceramic slip casting and a manufacturing method of the plaster mould. The plaster mould comprises the following materials: porous asphalt carbon and plaster slurry, wherein the plaster slurry is formed by dissolving plaster powder in water; the weight percentage of the porous asphalt carbon to the plaster powder is 1:(0.8-3). The invention further provides a manufacturing method of the plaster mould. The 2h-wet breaking strength, the 2h-wet comprehensive strength and the water absorption of the plaster mould obtained by the manufacturing method disclosed by the invention are obviously improved. Meanwhile, the plaster mould manufactured by the manufacturing method disclosed by the invention is excellent in corrosion resistance and abrasion resistance.

Description

technical field [0001] The invention relates to a gypsum mold for ceramic grouting and a preparation method thereof. Background technique [0002] Grouting molding is a simple and practical ceramic molding process, usually using gypsum as a molding mold. The production cost of gypsum is low, and its raw material gypsum is rich in reserves in my country and the price is low; it has good fluidity in production and can prepare molds of various shapes; in addition, it has unparalleled coagulation performance and water absorption performance. It is widely used in forming processes such as grouting, spinning, rolling, plastic pressing (cold pressing), and there is no other material that can completely replace it. [0003] The traditional process of preparing gypsum molds is to use a certain proportion of α gypsum powder and β gypsum powder mixed powder and water to prepare gypsum slurry, which is made by casting and drying. α gypsum powder has high strength, but its water absorpt...

Claims

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Application Information

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IPC IPC(8): C04B28/14B28B1/50
Inventor 沈益顺沈玉婷姜占锋
Owner BYD CO LTD
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