Production method of water based paint special for lost foam

Abstract

The invention provides a production method for water-based coating which is specially used for lost die. The composition of the water-based coating comprises: amorphous graphite powder, flaky graphite powder, bentonite, hydroxymethyl fiber, milk-white glue, corn starch, dextrin and BY adhesive. The composition proportion is 50% of the amorphous graphite powders, 50% of flaky graphite powders, 5-10% of bentonite, 3-5% of hydroxymethyl fiber, 1.5-3% of milk-white glue, 3-5% corn starch, 3-5% of dextrin and 2-3% of the BY adhesive. The method of the invention solves the problems that the currently usually used lost die is easy to cause that the casting is easy to be deformed, cracked, delaminated, stuck with sand on the surface, non-smooth and difficult to remove the stuck sand, thereby affecting the quality of the casting and being suitable for application in the casting production of the lost die.

Description

technical field [0001] The invention relates to the field of lost foam casting, in particular to a production method of a special water-based coating for lost foam. Background technique [0002] In the lost foam casting production, the lost foam coating is an important factor that affects the quality of the casting. At present, the commonly used lost foam coating is easy to cause deformation, cracking, delamination of the casting, and the surface is sticky and not smooth, and the sticky sand is difficult to remove, affecting The quality of the casting. Contents of the invention [0003] In order to solve the problem that the currently commonly used lost foam coatings are easy to cause deformation, cracking and delamination of castings, and the surface is sticky and not smooth, and the sticky sand is difficult to remove, which affects the quality of castings, a kind of soil-like graphite powder, scale-like graphite powder is invented. Graphite powder, bentonite, hydroxymet...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the currently commonly used lost foam coatings are easy to cause deformation, cracking and delamination of castings, and the surface is sticky and not smooth, and the sticky sand is difficult to remove, which affects the quality of castings, a kind of soil-like graphite powder, scale-like graphite powder is invented. Graphite powder, bentonite, hydroxymethyl cellulose, latex white glue, cornstarch, dextrin, BY binder are the production method of the special water-based coating for lost foam as raw materials