Special paint for evaporative pattern cast iron and manufacturing method of special paint

A technology of lost foam and cast iron, which is applied in manufacturing tools, casting equipment, coatings, etc., can solve the problem of uneven thickness of the coating on the surface of castings, and achieve the effect of improving suspension, good air permeability, and ensuring coating thickness.

Inactive Publication Date: 2013-04-03
安徽中兴华汉机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the uniformity of the coating is also very important. Most foreign coatings have poor thixotropy (referring to force, stirring, and shear thinning) and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] A special coating for lost foam cast iron of the present invention contains: 45-55 parts of bauxite, 30-35 parts of kyanite, 3-7 parts of mica powder, 10-14 parts of diatomite, 1-2 parts Attapulgite, 1.5-2.5 parts of sodium bentonite, 1-2 parts of sepiolite, 1.5-2.5 parts of artificial starch, 0.05-0.1 parts of hydroxyethyl cellulose, 2-4 parts of latex powder, 0.2-0.4 parts of acid Sodium, 0.1-0.3 part of defoamer and 0.1-0.3 part of surfactant, and 35-45% of water based on the total weight of the above ingredients. Preferably it contains: 50 parts of bauxite, 33 parts of spar powder, 5 parts of mica powder, 12 parts of diatomaceous earth, 1.5 parts of attapulgite, 2 parts of sodium bentonite, 1.5 parts of sepiolite, 2 parts artificial starch, 0.1 part of hydroxyethyl cellulose, 3 parts of latex powder, 0.3 part of sodium carbonate, 0.2 part of defoamer and 0.2 part of surfactant.

[0022] The antifoaming agent can be tributyl phosphate; the surfactant can be sodium d...

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Abstract

The invention relates to special paint for evaporative pattern cast iron and a manufacturing method of the special paint. The special paint comprises the following components: 45-55 parts of bauxite, 30-35 parts of spar powder, 3-7 parts of mica powder, 10-14 parts of kieselguhr, 1-2 parts of attapulgite, 1.5-2.5 parts of sodium bentonite, 1-2 parts of meerschaum, 1.5-2.5 parts of artificial starch, 0.05-0.1 part of hydroxyethyl cellulose, 2-4 parts of emulsion powder, 0.2-0.4 parts of sodium carbonate, 0.1-0.3 part of antifoaming agent, 0.1-0.3 part of surfactant and water with the weight accounting for 35-45% of the total weight of the other components. The thickness of a single coated coating of the paint is between 0.55mm and 0.7mm; and coating can ensure no flowing, and prevent exposure of a facade and cracks of a corner. The coating with the appropriate thickness is good in air permeability, and the paint is particularly suitable for castings with complicated inner cores, such as thin-wall gray iron castings with complicated inner cavities, like an engine body, a cylinder cover and a vent pipe.

Description

technical field [0001] The invention relates to a coating and a manufacturing method thereof, in particular to a special coating for lost foam cast iron and a manufacturing method thereof. Background technique [0002] Traditional casting coatings only play a barrier role between castings and molds to prevent sand sticking. However, ordinary casting coatings are prone to sand sticking due to poor adhesion, low strength, poor fire resistance, and large gas generation at high temperatures. , Trachoma, porosity, carbon residue and other defects. Sand sticking in castings is because the coating does not effectively block and isolate, or the chemical reaction between the coating and the high-temperature metal liquid occurs. [0003] The lost foam coating is the isolation layer between the molding sand and the foam mold. The finer the refractory material used for the coating, the thicker the coating is, and the casting is not easy to stick sand. However, thick coating and fine m...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C9/04
Inventor 孙月英王燕
Owner 安徽中兴华汉机械有限公司
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