Water-based coating for lost foam cast steel

Abstract

The invention belongs to the technical field of coating compositions for lost foam, is applicable to forming EPS foam pattern coatings of lost foam steel castings, and particularly discloses a water-based coating for lost foam cast steel. The water-based coating for the lost foam cast steel comprises the following components (calculated as the weight): 100 portions of quartz powder, 2 to 3 portions of lithium bentonite, 1 to 2 portions of white latex, 1 to 1.2 portions of sodium carboxymethyl cellulose, 2 to 3 portions of water soluble phenolic resin, 0.1 to 0.15 portion of aluminum powder, 0.08 portion of glass fiber, 0.02 to 0.03 portion of active agent, and 0.02 to 0.03 portion of defoaming agent. The coating ensures that the surface quality of castings is improved, meets the technical requirement of the castings, saves subsequent treatment procedures, improves production efficiency, improves the working environment of laborers, more importantly, eliminates the potential safety hazard during the subsequent use, and also improves the economic benefit of enterprises.

Description

technical field [0001] The invention belongs to the technical field of coating compositions for lost foam, and is suitable for forming EPS pattern coatings for steel castings of lost foam, specifically a water-based paint for steel castings of lost foam. Background technique [0002] In the production of lost foam steel castings, it is necessary to coat the surface of foam modules with paint. The characteristics of paint directly affect the quality and performance of steel castings. The preparation and drying of paint is one of the important links to obtain high-quality castings. In production , the quality of castings is unstable and the scrap rate rises due to unstable coating performance or inappropriate indicators, which deepens people's understanding of the importance of coatings. The smelting process in the production of steel castings has to go through pre-deoxidation, final deoxidation and other processes. The test deoxidation of the round cup sample in front of the ...

AI Technical Summary

Problems solved by technology

In order to meet the slow-fast-slow pouring requirements of the lost foam, a tilting ladle is often used. The white mold painted with paint needs to be strictly baked, but there are still varying numbers of spots on the top of the casting and at the corners of the casting. Micropores exist, and the adhesion between the coating and the casting cannot fall off by itself, so it is necessary to strictly inspect the surface of the casting in the subsequent treatment process, and perform welding repair on the parts with micropores, and then polish after welding. It is necessary to carry out annealing treatment, welding repair and then heat preservation to eliminate the welding stress caused by welding. If the treatment is not good, due to the difference of welding materials and the existence of internal stress, it will bury hidden dangers in the process of casting.

The defect is that the surface of carbon steel castings of lost foam casting often has micropores, which affects the surface quality and brings troubles to subsequent processing work. The grinding and processing process is expensive and increases costs. More importantly, it is not safe for subsequent use. , bury safety hazards; it is difficult to peel off the bonding coating, which increases the labor intensity of workers, deteriorates the working environment, increases cleaning costs, and reduces production efficiency; cracks appear after the coating is dried, causing flying thorns on the surface of the casting, and the subsequent processing workers labor High strength, harsh working environment, increased cleaning costs