Method for preparing solid-mold casting coating material for cast aluminum

Abstract

The invention discloses a method for preparing a solid-mold casting coating material for cast aluminum. According to the method, the solid-mold casting coating material is prepared from the following ingredients in parts by weight: 65-75 parts of quartz powder, 5-7 parts of plant ash, 5-7 parts of slag, 10-12 parts of corundum powder, 10-12 parts of sodium bentonite, 4-6 parts of nano attapulgite, 1-2 parts of lignosulfonic acid, 2-4 parts of polyvinyl alcohol, 0.3-0.7 part of n-octanol, 2-4 parts of sodium borate, 5-7 parts of starch paste, 1.4-1.6 parts of silica sol, 1-2 parts of nanoscale ceramic powder, 0.5-0.8 part of red ferric oxide powder and 525-535 parts of water. The solid-mold casting coating material prepared by the method has excellent gas permeability and quick-drying performance in both high-temperature environments and low-temperature environments, thereby being capable of meeting the production requirements of large-sized cast parts.

Description

technical field [0001] The invention relates to the field of casting, in particular to a method for preparing a solid casting coating for aluminum casting. Background technique [0002] The solid casting coating is a dispersion system composed of a variety of materials with different properties. Its composition mainly includes refractory materials, binders, carriers, nano-attapulgite and special additives. The coating needs to have good process performance and work performance. , quality stability and application reproducibility. The solid casting paint is coated on the outer surface of the foam plastic model, and the molding can only be poured after the paint is dry. Foamed plastics are airtight, have a low heat distortion temperature (about 70°C), and have poor affinity for water; foamed plastics are heated and melted, and after gasification, there are many liquid residues and a large amount of gas generation. If these gases and liquid residues cannot be discharged in tim...

AI Technical Summary

Problems solved by technology

[0003] The high temperature resistance of the casting coating in the prior art is relatively poor, and it can only be suitable for the production of small parts (within 200kg) with short high temperature treatment time, and cannot adapt to the production of large castings (within 20 tons) and small batches of manual operations

It has high temperature resistance and can be applied to the production process of large castings, but its manufacturing cost is high, and it cannot be applied to manual painting. The paint is black, which is easy to cause black pollution in the working environment