Powdery paint for lost foam casting of cast iron

Abstract

The invention discloses a special coating for pulverous expendable pattern casting and casting iron, and the special coating comprises 60-70 percent of 180-200 mesh refractory materials, 2.0-3.0 percent of suspending agent, 1.5-2.5 percent of adhesive, 0.3-0.6 percent of organosilicon defoamer, 0.01-0.03 percent of preservative agent and 180-200 mesh residual mica powder in balancing amount. When the special coating is prepared, various pulverous materials are weighed according to the required proportion, interposed into the powder stirrer in sequence to stir for 20 to 40 minutes at a low speed and then discharged and packed. When the coating is used, appropriate water is interposed into the stirred vessel by the powder-to-water ratio of 1 to (1.1-1.4). After the stirred vessel is turned on, the powder coating weighed is interposed in batches. The coating is utilized after preparing into slurry; therefore, the special coating has the advantages of good suspension property, high intensity, uniform coating, good thixotropy, good leveling property, glabrous surface, no bubbles, no cracks and the like. Moreover, the user can adopts the dip-coating method, the hang-coating method and the brush-coating method, the viscosity change of coating materials can be decided upon the demands of the user, and different viscosities can realize different coating thicknesses.

Description

technical field [0001] The invention belongs to the technical fields of metal material processing and metallurgy, and relates to a powder coating for lost foam cast iron, which has the advantages of no pollution, simple and convenient packaging and transportation, and no corruption and deterioration during long-term storage. Background technique [0002] Lost foam casting is currently the fastest growing new casting process, and coating technology is one of the keys to the success of this process. At present, most of the lost foam casting manufacturers in my country use self-made coatings to cope with production, and the obtained castings have rough surfaces and even casting defects. High-quality paint depends on imports, which are expensive. Some of the lost foam coatings currently on the market are water-based colloidal coatings, and a small amount are powder coatings. Water-based colloidal paint is packaged in iron drums or plastic drums, which increases the cost for us...

AI Technical Summary

Problems solved by technology

Commercial coatings currently available on the market are difficult to meet these requirements at the same time