A kind of sintering stripping type light-colored casting coating and preparation method thereof

Abstract

The invention discloses and provides a sintered strippable light-colored casting coating which is wide in application range, pollution-free, low in cost and good in sintering stripping performance and stability, and a preparation method thereof. The coating provided by the invention completely does not contain graphite powder; composite zirconium-containing silicate mineral powder is adopted as a main fireproof base material and a suspending agent, a bonding agent, a de-foaming agent and the like are added at the same time; the raw materials are low in price and sufficient in source; the coating is excellent in sintering stripping performance, sand bonding resistance and suspension stability, unlikely to generate deposits in long-term storage and transportation processes, low in production cost and free of environmental pollution, and can be used for producing various cast steel parts and various cast iron and non-ferrous cast parts; especially the sintering stripping performance of the coating is wide in adaptability and breaks through the limitation of narrow adaptation range of the sintering stripping performance ubiquitous in a conventional sintered strippable coating. The coating is applied in the technical field of casting coatings.

Description

Technical field [0001] The invention relates to a casting coating, in particular to a sintered peeling light-color alcohol-based casting coating and a preparation method thereof. Background technique [0002] Casting coating is a commonly used modeling material to prevent defects such as sand sticking and sand inclusion on the surface of castings, reduce surface roughness of castings, and reduce the workload of surface cleaning of castings. It has various technical effects and good comprehensive economic benefits. [0003] At present, common cast iron coatings in China generally use microcrystalline graphite powder and flake graphite powder as basic refractory materials. Graphite powder has high refractoriness and low price, which can effectively prevent sand sticking defects caused by metal infiltration. However, the graphite powder coating is black, which seriously pollutes the working environment and deteriorates working conditions during preparation and use; graphite powder wi...

AI Technical Summary

Problems solved by technology

Chromite powder also has solid-phase self-sintering characteristics similar to zircon powder, and is not wetted by molten steel. It has a large high-temperature thermal conductivity, strong chilling ability, strong paint sintering peeling ability and anti-sand sticking ability, but the cost is still high. higher, still darker

[0006] In recent years, some progress has been made in the development and application of light-colored casting coatings that replace zircon powder coatings in China. Some units have begun to use light-colored refractory materials such as bauxite powder, quartz powder, mullite powder, and magnesia powder with low prices. Several low-cost alcohol-based light-colored sintered peel-off cast iron coatings for resin sand have been developed, but these coatings still have the following four problems: one is that the anti-sticking sand effect is generally poor, or the suspension stability is poor, and the coating is not stable in long-term storage and transportation. Precipitation is easy to occur during the process, and the coating brush marks are serious, which affects the surface quality of the casting; secondly, the sintering temperature range of the coating becomes smaller, and the coating of the same formula cannot be suitable for large castings (wall thickness) and small castings (thin wall) at the same time. , or cannot adapt to castings with high pouring temperature and low pouring temperature at the same time, and the sintering peelability adaptability range is narrow, which limits the wide application of these low-cost light-colored sintering peeling coatings; the third is the sintering flux used in some coatings (or called Crystal nucleating agent) is an expensive superfine pyroxene, lanthanum / strontium rare earth or nano-scale aluminum, zirconium, chromium and other ultrafine solid powder materials (such as patent CN101088660A "light-colored cast iron coating of high aluminum polycrystalline composite aggregate ”); Fourth, most paints still contain some graphite powder, and the color is still dark (light gray or gray)