Coating for lost foam cast iron

Abstract

The invention belongs to the technical field of coatings for lost foam, in particular to a coating for lost foam cast iron. The invention provides the coating for the lost foam cast iron, which comprises the following components (calculated as the weight): 70 portions of bauxite, 30 portions of quartz powder, 2 to 5 portions of bentonite, 0.5 to 2 portions of white latex, 0.5 to 1.0 portion of sodium carboxymethyl cellulose, 2 to 3 portions of water soluble phenolic resin, 0.5 to 2 portions of attapulgite, 2 to 5 portions of spodumene powder, 0.01 to 0.03 portion of surfactant, and 0.01 to 0.02 portion of defoaming agent. The coating has thin and even coatings and good air permeability; the surfaces of castings are smooth, clean, and level and easy to peel off, and black defects are eliminated; and the castings have level surfaces and high surface quality.

Description

technical field [0001] The invention belongs to the technical field of coatings for lost foam, in particular to a coating for lost foam cast iron. Background technique [0002] In the production of lost foam castings, due to the high carbon content and the incomplete gasification of the EPS foam during the pouring process, black defects are often caused, that is, black spots after processing, which cause the casting to be scrapped, and the air permeability and adsorption capacity of the pattern coating can be increased. Effectively eliminate black defects, but most refractory coatings increase the adsorption capacity while sacrificing the flatness of the casting surface, ensuring the surface quality of the castings but cannot guarantee the adsorption capacity and increase the difficulty of coating cleaning. The unevenness of the casting surface seriously affects the casting. Appearance Quality. In the production of lost foam castings, the preparation and drying of coatings ...

AI Technical Summary

Problems solved by technology

The previous paint coating is thick, poor air permeability, foam plastic gasification is not easy to discharge, resulting in carbon slag defects in iron castings, or casting scrapping, affecting performance, low casting pass rate, low high temperature strength, uneven surface of castings after pouring, Affect the appearance of the casting, or increase the grinding process. It is not difficult to see the combination of bauxite and quartz powder in conventional coatings, but the thickness of the coating is difficult to clean and the fluctuation of pouring temperature often causes black defects. Coatings containing spodumene powder It is recently developed and used, but it is still difficult to achieve the ideal casting quality