Alcohol-group dry powder sand mould foundry coating

Abstract

The invention discloses alcohol-group dry powder sand mould foundry coating, which comprises the following components in percentage by weight: 60-75% of bauxite, 2-10% of amorphous graphite, 3-15% of lamellar graphite, 2-10% of iron oxide red, 1-5% of attapulgite, 0.5-1.5% of sodium bentonite, 1-5% of polyvinyl butyral, 0.1-0.5% of surfactant and 0.1-0.5% of dispersing agent. The dry powder coating has the advantages of simple preparation technology, convenience in use and good high-temperature sand adhesiveness resistance.

Description

technical field [0001] The invention relates to an auxiliary material for casting molding, in particular to an alcohol-based dry powder casting coating for sand casting. Background technique [0002] Coating a layer of casting paint on the working surface of the casting sand mold (core) can effectively prevent and reduce the gradual surface sticking of sand, sand inclusions, sand holes and other defects, and reduce the surface roughness of the casting. The quality of casting coating is the most direct factor that affects whether the casting is sand-sticking, sand inclusion, surface finish of the casting, and dimensional accuracy of the casting. There are many kinds of casting coatings, which can be roughly divided into two categories: water-based coatings and alcohol-based coatings. Among them, the alcohol-based coating can be cured after being coated and ignited. It can be used in conjunction with various self-hardening sand processes without drying, which can shorten ...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent (application number: 86105456) discloses a lithium-based bentonite zircon powder powder casting coating, the raw materials such as lithium-based bentonite, zirconium quartz powder, resin and titanium dioxide are mixed and milled to make a powder coating. When directly adding ethanol to dilute into a slurry paint, but because the lithium-based bentonite has not caused swelling, the suspension of the paint is poor

Chinese patent (application number: 200910189788.4) discloses a preparation method of alcohol-based nano-composite and surface-modified dry powder casting coatings, by using nano-layered clay and nano-SiO 2 Compose a composite suspending agent, and then mix and grind it with refractory powder, binder and other additives to form alcohol-based dry powder coatings. The preparation process requires high requirements, and the performance of the coating will be affected if it is not properly controlled.

Chinese patent (publication number: CN100377811C) discloses a production method of alcohol-based attapulgite casting coating powder, using sodium-modified attapulgite clay as a suspending agent, and the prepared coating powder can achieve a higher suspension in ethanol rate, but the percentage of modified attapulgite clay in the coating powder is 55~85%, the refractory powder is only 10~45%, the amount of suspending agent is much higher than that of refractory powder, although the obtained coating has better Suspension stability, but at the expense of reduced refractoriness of the coating

Therefore, the scope of application of the coating is limited, and it cannot be used in the production of steel castings and large iron castings