High-temperature good-strength quartz-based expendable pattern paint modified by mica powder and preparation method of high-temperature good-strength quartz-based expendable pattern paint

Abstract

The invention discloses high-temperature good-strength quartz-based expendable pattern paint modified by mica powder. The high-temperature good-strength quartz-based expendable pattern paint is prepared from the following raw materials in parts by weight: 100-102 parts of quartz powder, 0.9-1.1 parts of modified starch, 0.9-1.1 parts of carboxymethyl cellulose, 2.4-2.6 parts of sodium bentonite, 0.9-1 part of mica powder, 0.8-0.9 part of tetrapod ZnO whiskers, 0.9-1.1 parts of silicasol, 10-13 parts of ethanol, an appropriate amount of water, 0.5-0.6 part of aluminum sol, 1.1-1.3 parts of nonionic boronates and 0.2-0.3 part of tea tree essential oil. The aluminum sol, the nonionic boronates and the tea tree essential oil are used, so that the bentonite is modified, the lipophilicity of the bentonite is improved, and the cohesiveness and the sagging resistance of the paint to plastic foams are improved; therefore, coatings are uniform and compact, molten steel is prevented from penetrating, the fissility is improved, and the aluminum sol and the nonionic boronates can form heat-resistant oxide after being heated, so that the high temperature strength of the coatings is improved.

Description

technical field [0001] The invention relates to the technical field of lost-foam coatings, in particular to a mica powder-modified quartz-based lost-foam coating with good high-temperature strength and a preparation method thereof. Background technique [0002] Lost foam casting is a casting technology with almost no margin, and coating is the key point of lost foam casting. The performance of coating is directly related to the quality of castings. Lost foam coatings generally consist of refractory aggregates, binders, suspending agents, carriers, and additives. As a cheap and easy-to-obtain refractory aggregate, quartz powder is widely used in lost foam casting, but its application is limited due to its poor sintering performance. The principle of the lost foam coating at the beginning of the design is to sinter and peel off. If the sintering performance of the refractory aggregate is poor at the pouring temperature, a sufficient amount of liquid phase cannot be formed. ...

AI Technical Summary

Problems solved by technology

[0003] However, the poor dispersion and suspension of mica in the coating can easily lead to uneven flexural strength after sintering and uneven peeling performance, and the mica becomes flakes, which will block the pores, affect the gas discharge, and cause the pores of the casting, which needs to be improved.