Method for preparing solid-mold casting coating material for large-sized cast parts

Abstract

The invention discloses a method for preparing a solid-mold casting coating material for large-sized cast parts. According to the method, the solid-mold casting coating material is prepared from the following ingredients in parts by weight: 68-75 parts of quartz powder, 5-7 parts of wood ash, 5-7 parts of fly ash, 10-12 parts of water glass, 10-12 parts of sodium bentonite, 4-6 parts of nano calcium carbonate, 1-2 parts of lignosulfonic acid, 2-4 parts of carboxymethyl cellulose, 0.3-0.7 part of glycerine, 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, 1-2 parts of sodium tripolyphosphate, 4-5 parts of potassium feldspar powder and 525-635 parts of water. The solid-mold casting coating material prepared by the method has excellent gas permeability and quick-drying performance in both a high-temperature environment and a low-temperature environment, thereby meeting the production requirements of the large-sized cast parts.

Description

technical field [0001] The invention relates to the field of casting, in particular to a method for preparing a full mold casting paint for large castings. 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-calcium carbonate and special additives. The coating needs to have good process performance, work performance, Quality consistency 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 ...

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