Cast iron sand mold protecting coating coated to surface of 40-120-mesh sand and preparation method thereof

Abstract

The invention relates to a cast iron sand mold protecting coating coated to the surface of 40-120-mesh sand and a preparation method thereof. The cast iron sand mold protecting coating is prepared from the following components in parts by mass: 50-85 parts of a refractory aggregate, 3-5 parts of a suspender, 1-2.5 parts of an adhesive and 30-45 parts of a solvent, wherein the size distribution ofthe refractory aggregate is as follows: 5-15wt% of -100-+120 meshes, 25-45wt% of -120-+270 meshes and 30-50wt% of 270 meshes. The coating is good in coating effect and good in permeating effect on thesurface of 40-120-mesh mold sand. The surface structure of the cast iron mold sand is modified, the levelness is improved, and permeation to the mold sand by molten metal is shielded; moreover, sulfur released by the sand mold at a high temperature is absorbed by the coating, so that the under-nodularizing thickness of a cast iron part is reduced greatly.

Description

technical field [0001] The invention relates to the technical field of casting materials, in particular to a cast iron sand mold protective coating for coating on the surface of 40-120 mesh molding sand and a preparation method thereof. Background technique [0002] In the casting production process, molding sand molding is an important production process. Because furan resin sand molding has the characteristics of high strength, high dimensional accuracy, fast hardening speed, high production efficiency and low labor intensity, it is widely used in the current foundry production. However, the curing agent for furan resin is mainly p-toluenesulfonic acid, xylenesulfonic acid, sulfuric acid, or a mixture of any two or three of the above substances, etc., which will produce harmful elemental sulfur during the casting process. The situation will lead to cracks or poor spheroidization of castings, which will affect the quality of casting products. [0003] Foundry paint is a v...

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Problems solved by technology

[0011] In view of the problems existing in the prior art that the sulfur element in the production of furan resin sand castings damages castings, and the thickness of the surface of ductile iron castings is poor and the thickness is large, one of the purposes of the present invention is to provide a highly stable coating The cast iron sand mold protective coating on the surface of the 40-120 mesh sand mold can shield the metal liquid from penetrating the sand mold through the cast iron sand mold protective coating, and shield the gas generated in the sand mold from immersing into the metal liquid to prevent the harmful sulfur element in the sand mold from being produced on the casting. Adverse effects, greatly reducing the thickness of nodularization failure of ductile iron castings

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