Gypsum shell low in retained strength and preparing method of gypsum shell

Abstract

The invention discloses a gypsum shell low in retained strength and a preparing method of the gypsum shell. Gelatin is contained in the gypsum shell. The method comprises the steps that gypsum powderand filler are evenly mixed; after water is heated, the gelatin is added in the water, uniform mixing is conducted, and a transparent solution is obtained; gypsum powder and filler mixed powder is added in the transparent solution, and slurry is obtained; the slurry is poured into a die; after the slurry in the die is hardened, the die is dismounted, standing is conducted at the room temperature,and a wet gypsum shell is obtained; and the wet gypsum shell is naturally dried and roasted, and the gypsum shell low in retained strength is obtained. The gypsum shell is low in retained strength andeasy to clean, the preparing method is simple, and the production efficiency is high.

Description

technical field [0001] This article relates to the field of inorganic non-metallic materials, especially a gypsum shell with low residual strength and a preparation method thereof. Background technique [0002] The gypsum type precision casting process is the main process for forming non-ferrous metals, and it is the most widely used process in production at present. The most important factor determining the quality of castings is the strength of the plaster shell. Among them, the residual strength is the strength of the molded shell after pouring into the molten alloy casting and solidifying. In view of the shortcomings of high labor intensity and imperfect cleaning after casting, appropriately reducing the residual strength of the mold shell is of great significance to speed up the cleaning speed, improve production efficiency and economic benefits. However, at present, researchers at home and abroad pay more attention to how to improve the wet strength of the gypsum she...

AI Technical Summary

Problems solved by technology

In view of the disadvantages of high labor intensity and imperfect cleaning after pouring, appropriately reducing the residual strength of the mold shell is of great significance to speed up the cleaning speed, improve production efficiency and economic benefits

However, at present, researchers at home and abroad pay more attention to how to improve the wet strength of the gypsum shell at room temperature and the high-temperature strength after drying and roasting. There is little research on reducing the residual strength of the shell and improving the mechanical properties after roasting.

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