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Manufacturing Technology of High Strength Nixing Pottery Plaster Mold

A gypsum mold and manufacturing process technology, applied in the direction of manufacturing tools, ceramic molding machines, etc., can solve the problems of reducing strength, shortening the service life of gypsum molds, reducing the strength of gypsum molds, water resistance and corrosion resistance, and achieving the goal of increasing strength Effect

Active Publication Date: 2019-09-20
广西钦华陶艺开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gypsum mold has been in a complex and humid mud environment for a long time. When the gypsum mold encounters Nixing ceramic mud, water molecules and electrolytes will invade the capillary pores of the gypsum mold to weaken the force between the gypsum crystal particles, and the complete and stable network structure of the crystal is destroyed. to damage, resulting in local collapse and damage of part of the dihydrate gypsum due to corrosion and dissolution, reducing its strength and ultimately shortening the service life of the plaster mold
[0003] In order to ensure the production efficiency and quality of the Nixing pottery body, the gypsum mold must have a porosity of 30-40%. Therefore, when preparing the gypsum slurry, the water consumption is as high as 60-80%, far exceeding the theoretical value of 18.16%, which is seriously reduced. The strength, water resistance and corrosion resistance of the gypsum mold lead to a very short service life of the gypsum mold, generally only 60 to 100 times

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Mix gypsum powder and water at a weight ratio of 100:40 to obtain gypsum slurry;

[0019] 2) Add 0.01% of PrCl by weight to the gypsum slurry 4 , Stir evenly to obtain a mixed slurry;

[0020] 3) The mixed slurry is made into blank molds of various shapes and dried to form a plaster mold.

[0021] After testing, the 2h flexural strength of the plaster mold is above 7.41MPa, the absolute dry flexural strength is above 14.25MPa, the water absorption rate is 30.45%, and the number of uses can reach more than 150 times.

Embodiment 2

[0023] 1) Mix gypsum powder and water at a weight ratio of 100:50 to obtain gypsum slurry;

[0024] 2) Add 0.1% by weight of PrCl to the gypsum slurry 4 , Stir evenly to obtain a mixed slurry;

[0025] 3) The mixed slurry is made into blank molds of various shapes and dried to form a plaster mold.

[0026] After testing, the 2h flexural strength of the plaster mold is above 7.15MPa, the absolute dry flexural strength is above 14.06MPa, the water absorption rate is 36.16%, and the number of uses can reach more than 150 times.

Embodiment 3

[0028] 1) Mix gypsum powder and water at a weight ratio of 100:45 to obtain gypsum slurry;

[0029] 2) Add 0.05% of PrCl by weight to the gypsum slurry 4 , Stir evenly to obtain a mixed slurry;

[0030] 3) The mixed slurry is made into blank molds of various shapes and dried to form a plaster mold.

[0031] After testing, the 2h flexural strength of the plaster mold is more than 7.32MPa, the absolute dry flexural strength is more than 14.19MPa, the water absorption rate is 35.45%, and the number of uses can reach more than 150 times.

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Abstract

The invention provides a manufacturing process of a high strength nixing pottery gypsum die. The manufacturing process comprises the following steps: 1) mixing gypsum powder with water to obtain a gypsum slurry; 2) adding PrC14 0.01-0.1% of the weight of the gypsum slurry into the gypsum slurry, and uniformly stirring to obtain a mixed slurry; 3) preparing blank dies in various shapes from the mixed slurry, and drying, so as to obtain the gypsum die. According to the manufacturing process of the high strength nixing pottery gypsum die, after PrC14 is added into the gypsum slurry, the strength of the prepared gypsum die is greatly improved, the 2h folding strength reaches 7 MPa or above, the absolute dry folding strength reaches 14 MPa or above, and the using times reaches 150 or above.

Description

Technical field [0001] The invention relates to a mold manufacturing process, in particular to a manufacturing process of a high-strength Nixing pottery gypsum mold. Background technique [0002] The molding methods of Nixing ceramic body include grouting, compression molding and plastic molding. Because grouting has high efficiency and great adaptability, it can be used for large-size, complex shapes, and irregular shapes. It is made by grouting. Grouting is to use the capillary force of the pores in the plaster mold to absorb the excess water in the mud to dispersely adhere the mud to the mold to form a mud layer with the same shape as the mold, and gradually increase its thickness with time. When the thickness reaches the requirement, the excess mud is poured out, and it is separated from the plaster mold wall after drying and shrinkage, and then the green body is demolded out. Because the strength of the gypsum mold mainly depends on the friction and adhesion between the gy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/26C04B28/14C04B22/12
Inventor 苏文中
Owner 广西钦华陶艺开发有限公司