Method of preparing water-soluble mold core

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...

AI Technical Summary

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.