Method of preparing water-soluble mold core

A water-soluble, mold core technology, applied in casting and molding equipment and other directions, can solve the problems of accelerating the dissolution rate of PEG core mold, difficult to achieve room temperature curing, slow mold core material, etc., to achieve good water solubility, good high temperature mechanical properties, Good temperature resistance

Inactive Publication Date: 2008-07-30
BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Bonding, 2007, 28: 13-15] also uses phosphate starch as a water-soluble binder to prepare the core mold material for composite molding, but the disadvantage of the binder is: the water solubility of the core material is at room temperature Slower, requires heating to completely collapse
However, when the core mold using PEG as the binder is removed, it is necessary to put the pressed core mold into about 10% hydrochloric acid aqueous solution. Since the core mold contains active sodium bicarbonate, it reacts with hydrochloric acid to produce a large amount of Carbon dioxide gas, so the dissolution rate of the PEG core mold is accelerated, and the working environment is poor. At the same time, it also needs heating and curing, which is difficult to achieve room temperature curing, and the temperature resistance is poor.

Method used

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preparation example Construction

[0021] The present invention will be described in further detail below. A kind of preparation method of water-soluble mold core is characterized in that, the operation steps of this method are as follows:

[0022] (1) preparing an aqueous solution of the binder; adding 5 to 50 wt % of the polyvinylpyrrolidone binder in water, fully stirring, and dissolving it completely to obtain an aqueous solution of the binder;

[0023] (2) Add aggregate; add solid powder as aggregate to the above-mentioned binder aqueous solution, the addition of solid powder is 0.5 to 5 times the weight of the binder solution, fully stir after adding, and form a uniform mud, The solid powder is one of alumina, quartz, zirconia, glass beads, high-strength, and other non-hydrolyzable ceramic powders, graphite powder, metal powder, chopped carbon fibers, and other non-hydrolyzable polymer powders or Combinations of multiple substances;

[0024] (3) Add gypsum powder to the above slurry; the amount of gypsu...

Embodiment 1

[0030] Use PVP K30 as the binder, prepare a solution with a concentration of 10wt%, weigh 30g of the solution, add 100g of alumina ceramic powder and 20g of gypsum powder, and stir fully on the mixer for 30 minutes to obtain a uniform slurry, and perform vacuum defoaming After 10 minutes, it was cast into a steel mold, left naturally for 2 hours, demolded, put into an oven and dried at 80°C for 1 hour, then raised to 120°C and dried for 2 hours to obtain a water-soluble mandrel.

Embodiment 2

[0032] Use PVP K30 as the binder, prepare a solution with a concentration of 20wt%, weigh 30g of the solution, add 40g of alumina ceramic powder and 80g of gypsum powder, and fully stir on the mixer for 30 minutes to obtain a uniform slurry, and perform vacuum defoaming After 10 minutes, it was cast into a steel mold, left naturally for 2 hours, demolded, put into an oven and dried at 80°C for 1 hour, then raised to 120°C and dried for 2 hours to obtain a water-soluble mandrel.

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Abstract

The invention pertains to a casting moulding technical field, which relates to improvement of a technical mold core for casting and molding resin matrix composites. The steps in the invention are the following: preparing aqueous solution of a bonder-adding aggregate-adding plaster powder-defoaming-casting moulding- drying- post-processing. Solidification has advantages of room temperature curing and good temperature endurance, good water solubility at room temperature and no environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of pouring molding, and relates to the improvement of a process mold core for casting and resin-based composite material molding. Background technique [0002] Core mold materials are currently used primarily in the foundry and composite manufacturing industries. With the development of modern industrial technology, especially the rapid development of aviation and aerospace, the shape of castings is becoming more and more complex, and the requirements for the complexity of the inner cavity, dimensional accuracy and surface finish are getting higher and higher. The sand core adhesive is one of the most used raw materials in foundry production, which is directly related to the quality and quantity of foundry sand core production, as well as the working environment of the foundry workshop. Adhesives for foundry can be divided into two categories: inorganic and organic: inorganic type includes water glass, clay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C7/06
Inventor 益小苏王岭仝建峰陈大明李宝伟黄浩华文君
Owner BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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