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Composition for drying gypsum and preparation method of gypsum mold

A technology of composition and gypsum, which is applied in the field of gypsum drying composition, can solve the problems of rough process, long time consumption, and the difficulty of fast mold to meet the fast requirements, etc.

Inactive Publication Date: 2012-02-08
KUNSHAN RUIJIE PRECISION MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies are complex, time-consuming, and expensive, which affects the development progress of new products
However, due to the rough process, low precision and short life of the traditional rapid mold, it is difficult to fully meet the requirements of users, and it is also difficult for the traditional rapid mold to meet the rapid requirements.

Method used

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  • Composition for drying gypsum and preparation method of gypsum mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Gypsum material ratio

[0020] White cement 10wt%, sodium polyphosphate 0.01wt%, soda ash 0.05wt%, the balance is hemihydrate gypsum; water-solid ratio is 1: 1wt%;

[0021] (2) Vacuum mixing and stirring

[0022] Weigh the above-mentioned gypsum mixture and water quantitatively according to the ratio of 1:1; vacuum degree: 5×10 3 Pa, stirring speed: 400r / min, stirring time is 2min;

[0023] (3) Gypsum type vacuum molding

[0024] The slurry fills the cavity from bottom to top along the edge of the master mold, and when the grouting is finished, open the grouting chamber immediately; the vacuum degree of the grouting chamber is 5×10 3 Pa; grouting time is 30sec;

[0025] (4) Gypsum drying

[0026] The gypsum type after grouting, after standing still for 30 minutes, is removed from the mold. After demoulding, the gypsum type is dried and hardened in the air at a temperature of 25°C for 20 hours, and then painted with 1wt% sodium chloride solution, and the...

Embodiment 2

[0030] (1) Gypsum material ratio

[0031] White cement 10wt%, sodium polyphosphate 0.01wt%, soda ash 0.05wt%, the balance is hemihydrate gypsum; water-solid ratio is 1: 1wt%;

[0032] (2) Vacuum mixing and stirring

[0033] Weigh the above-mentioned gypsum mixture and water quantitatively according to the ratio of 1:1; vacuum degree: 5×10 3 Pa, stirring speed: 400r / min, stirring time is 2min;

[0034] (3) Gypsum type vacuum molding

[0035] The slurry fills the cavity from bottom to top along the edge of the master mold, and when the grouting is finished, open the grouting chamber immediately; the vacuum degree of the grouting chamber is 5×10 3 Pa; grouting time is 30sec;

[0036] (4) Gypsum drying

[0037] The gypsum type after grouting, after standing still for 30 minutes, the mold is removed. After demoulding, the gypsum type is dried and hardened in the air at a temperature of 25°C for 20 hours, and then painted with 1wt% NaCl+0.5wt% sodium nitrate. solution,...

Embodiment 3

[0041] (1) Gypsum material ratio

[0042] White cement 10wt%, sodium polyphosphate 0.01wt%, soda ash 0.05wt%, the balance is hemihydrate gypsum; water-solid ratio is 1: 1wt%;

[0043] (2) Vacuum mixing and stirring

[0044] Weigh the above-mentioned gypsum mixture and water quantitatively according to the ratio of 1:1; vacuum degree: 5×10 3 Pa, stirring speed: 400r / min, stirring time is 2min;

[0045] (3) Gypsum type vacuum molding

[0046] The slurry fills the cavity from bottom to top along the edge of the master mold, and when the grouting is finished, open the grouting chamber immediately; the vacuum degree of the grouting chamber is 5×10 3 Pa; grouting time is 30sec;

[0047] (4) Gypsum drying

[0048] The gypsum type after grouting, after 30 minutes of standing still, is removed from the mold. After demoulding, the gypsum type is dried and hardened in the air at a temperature of 25°C for 20 hours, and then painted with 1wt% NaCl+0.5wt% KNO 3 The formed solu...

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Abstract

The invention relates to a composition for drying gypsum, which is characterized in that: the composition comprises 0.5-1.5 wt% of alkaline earth metal chlorides. The invention also relates to a preparation method of a gypsum mold, which comprises the step of applying the above composition to a dried and hardened gypsum mold surface. The composition of the application and the method not only greatly shorten the drying time, but also do not influence the performance of the gypsum mold; in addition, the composition has low raw material cost and a simple application method, so the invention has good practicality.

Description

technical field [0001] The invention relates to a composition for drying gypsum. In addition, the invention also relates to a preparation method for gypsum molding. Background technique [0002] Gypsum casting is a characteristic casting process, which refers to a casting method in which molten metal is poured into a mold made of gypsum as the base material. It has the advantages of being able to cast non-ferrous metal castings with high surface precision and complex shapes, and is easy to clean after pouring. It is often used in the manufacture of non-ferrous metal molds. The main disadvantage of the method of obtaining plaster molds by turning over the mold is that the process is complicated, and it is necessary to make a master mold, The silicone mold is turned over, the plaster mold is poured, and the metal casting is poured after the plaster mold is obtained, and there is a loss of precision during the mold turning process. [0003] The gypsum type is formed by groutin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/024C04B40/00
Inventor 郑霞
Owner KUNSHAN RUIJIE PRECISION MOLD