Lost foam coating with high fire resistance and preparation method of lost foam coating

Abstract

The invention provides a lost foam coating with high fire resistance and a preparation method of the lost foam coating, and relates to the technical field of production of lost foam. The lost foam coating is prepared from the following components in parts by weight: 30-40 parts of magnesite powder, 25-30 parts of pearl powder, 15-25 parts of mica powder, 3-8 parts of petroleum coke powder, 3-8 parts of silica sol, 1-5 parts of white emulsion, 0.3-0.5 part of triethanolamine, 0.1-0.6 part of sodium carboxymethylcellulose, 1-6 parts of adsorbent and 0.3-2 parts of fire retardant; and the fire retardant comprises, by weight, 5-8 parts of perchloropentacyclodecane, 3-5 parts of chlorendic acid, 1-2 parts of melamine cyanurate and 3-4 parts of potassium gold chloride. The preparation method comprises the following steps: grinding and sieving the magnesite powder, the pearl powder, the mica powder, the petroleum coke powder, the sodium carboxymethylcellulose and the adsorbent; adding water in the adsorbent, the fire retardant, the sodium carboxymethylcellulose and the triethanolamine and mixing; and fully mixing the magnesite powder, the pearl powder, the mica powder, the petroleum coke powder, the silica sol and the white emulsion. During casting of workpieces, the lost foam coating is high in adhesive, free of residue, relatively good in fire resistance and high in stability; and production quality can be improved.

Description

Technical field: [0001] The invention relates to the technical field of lost foam production, in particular to a high flame retardancy lost foam coating and a preparation method thereof. Background technique: [0002] Lost foam casting is a full-type casting of foam plastic mold using dry sand without binder combined with vacuum technology. The main names in China are "dry sand solid mold casting", "negative pressure solid mold casting", or EPC casting for short. Lost foam casting is one of the most advanced casting methods in the world at present. It is known as a "revolution" in the history of casting, and it is called green casting in the 21st century at home and abroad. Many of the existing technologies of lost foam are not formed as a whole at one time, and need to be completed by bonding and molding, and there is a coating on the outside. The coating used for bonding of lost foam in the prior art is relatively simple, and the viscosity is not high , poor flame retard...

AI Technical Summary

Problems solved by technology

Many of the existing technologies of lost foam are not formed as a whole at one time, and can only be completed by bonding and molding, and there are coatings on the outside. The coatings used for bonding of lost foam in the prior art are relatively simple, and the viscosity is not high , poor flame retardancy, poor stability, easy to produce residues, affecting the smoothness of the outer surface of cast parts