High-thermostability water-based paint containing nanometer wollastonite for lost foam casting and manufacturing method of water-based paint

Abstract

The invention relates to the technical field of lost form casting and in particular to high-thermostability water-based paint containing nanometer wallastonite for lost foam casting and a manufacturing method of the water-based paint. According to the paint, high-alumina bauxite and violet lime stone powder with the different grain sizes are used as refractory aggregates, so that the permeability of a coating is good, the thermostability is better, and the high heat resistance and impact resistance are good; a nanometer wollastonite, aluminum-magnesium silicate and sodium carboxymethylcellulose mixed sizing agent is used as a suspending agent, so that the paint has the good suspension property and thixotropy, a polyethylene wax emulsion is dispersed into the coating, then the flatness of the surface of the coating can be improved, the sand prevention stickiness is improved, rapid melting is performed in the pouring process, and the permeability of the coating is further improved; and the obtained paint is good in stickiness, the coating strength is uniform, the permeability is good, the thermostability is good, the size is stable, molten metal is not polluted, stripping is easy after casting is finished, and the quality of castings is effectively improved.

Description

technical field [0001] The invention relates to the technical field of lost foam casting, in particular to a highly thermally stable water-based coating for lost foam casting containing nano wollastonite and a preparation method thereof. Background technique [0002] The coating for lost foam refers to a layer of special coating coated on the outer surface of the pattern during the lost foam casting process. It plays a key role in the casting process. Since the pattern is made of foam plastic, the gas permeability of the coating , coating strength, rheology and other properties will have a crucial impact on the casting product. The lost foam coating with excellent performance should meet: (1) It can help improve the strength and rigidity of the foam plastic pattern and prevent the pattern from being damaged and deformed. (2) It has the function of isolation, which separates the molten metal from the model, prevents the molten metal from penetrating into the dry sand, and pre...

AI Technical Summary

Problems solved by technology

[0003] The composition of lost foam coatings mainly includes refractory aggregates, adhesives, solvents, suspending agents and various additives. According to the nature of the binder used, it is mainly divided into water-based coatings, alcohol-based coatings, resin coatings, etc. Among them, water-based coatings are widely used in actual production because of their low cost. However, water-based coatings are easy to collapse and stick to sand when the coating is cleaned, and most of the products still have defects in the performance of the products. described effect