Special coating for full mold casting

Abstract

A special coating for full mold casting is characterized in that the coating is prepared by mixing and stirring components consisting of sodium borate, phosphoric acid, silica sol, ethyl acetate, polypropylene acyl carboxy, carboxymethyl cellulose sodium and absorbent according to the weight ratio of 10:2-3:6-9:8-10:8-10:2-6:5-8. The special coating for full mold casting has the advantages that the coating property and thixotropy are quite strong, and the casting can effectively absorb liquid products produced by foam plastic model pyrolysis during the using process, thus reducing the porosity of a casting part below 0.2 percent, greatly improving the precision of the size of the casting part, and reducing the finishing allowance of blanks of the casting part.

Description

technical field [0001] The invention relates to a special coating for full mold casting, which belongs to the technical field of material modification chemical materials. Background technique [0002] In the full mold casting industry, full mold surface coating is one of the key technologies of full mold casting. In the prior art, the porosity of the full-shape cast aluminum parts is a major problem in the promotion of the full-shape casting. In order to reduce the porosity of aluminum castings, the performance of aluminum alloy lost foam coating is very important. The patent application number is 01142612.8 "Absorptive Aluminum Alloy Lost Foam Casting Coating and Its Preparation Method" disclosed in the invention patent specification, which provides that the chemical components of the coating are diatomite, pearl powder, mica powder, silica gel liquid, white latex, polypropylene The special coatings for lost foam casting made of acyl carboxyl, sodium carboxymethyl cellulo...

AI Technical Summary

Problems solved by technology

The patent application number is 01142612.8 "Absorptive Aluminum Alloy Lost Foam Casting Coating and Its Preparation Method" disclosed in the invention patent specification, which provides that the chemical components of the coating are diatomite, pearl powder, mica powder, silica gel liquid, white latex, polypropylene Special coatings for lost foam casting made of acyl carboxyl, sodium carboxymethyl cellulose and adsorbents all have shortcomings such as too thin coating, poor adhesion, and poor air permeability.