Alcohol-based paint for sand casting and preparation method thereof

A sand casting and coating technology, which is applied in casting molding equipment, coatings, molds, etc., can solve the problems of poor storage stability of coatings, easy cracking of coatings, easy precipitation and agglomeration, etc., and achieve good high temperature strength and stability. , Easy to store, the effect of ensuring the surface quality

Inactive Publication Date: 2014-12-24
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these products generally have the following defects: 1. The storage stability of the paint is poor, and it is easy to precipitate and agglomerate during storage, resulting in a decrease in viscosity
2. The strength of the high-temperature coating is poor, the coating is easy to crack and fall off, and the molten steel is easy to break through the coating and penetrate into the sand mold, resulting in sand inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 75 kg of bauxite, 5 kg of attapulgite, 0.5 kg of sodium bentonite, 2 kg of amorphous graphite, 3 kg of flake graphite, 8.3 kg of iron red, 1 kg of polyvinyl butyral, and 0.1 kg of oxyethylene ether, 0.1 kg of aliphatic dicarboxylic acid, and 5 kg of hydrochloric acid solution (mass concentration: 5%). Among them, the particle size of bauxite, attapulgite, sodium bentonite, amorphous graphite and flake graphite is 300-500 mesh.

[0024] Weigh the polyvinyl butyral according to the above components, add an appropriate amount of methanol solvent, stir well, and wait until the polyvinyl butyral is completely dissolved. Weigh bauxite, attapulgite, sodium bentonite, amorphous graphite, flake graphite and iron red. Add alkylphenol polyoxyethylene ether, aliphatic dicarboxylic acid, polyvinyl butyral solution and hydrochloric acid solution, put into the mill and stir evenly; add methanol solvent into the mill, the total amount of methanol added is Finally adjust the den...

Embodiment 2

[0026] Weigh 60 kg of bauxite, 1 kg of attapulgite, 0.5 kg of sodium bentonite, 10 kg of amorphous graphite, 15 kg of flake graphite, 6.5 kg of iron red, 5 kg of polyvinyl butyral, and 0.5 kg of oxyethylene ether, 0.5 kg of aliphatic dicarboxylic acid, and 1 kg of hydrochloric acid solution (mass concentration: 2.31%). Among them, the particle size of bauxite, attapulgite, sodium bentonite, amorphous graphite and flake graphite is 300-500 mesh.

[0027] Weigh the polyvinyl butyral according to the above components, add an appropriate amount of ethanol solvent, stir well, and wait until the polyvinyl butyral is completely dissolved. Weigh bauxite, attapulgite, sodium bentonite, amorphous graphite, flake graphite and iron red. Add alkylphenol polyoxyethylene ether, aliphatic dicarboxylic acid, polyvinyl butyral solution and hydrochloric acid solution, put into the mill and stir evenly; add ethanol solvent into the mill, the total amount of ethanol added is Finally adjust the d...

Embodiment 3

[0029] Weigh 70 kg of bauxite, 3.7 kg of attapulgite, 1.5 kg of sodium bentonite, 6 kg of amorphous graphite, 9 kg of flake graphite, 2 kg of iron red, 3 kg of polyvinyl butyral, and 0.4 kg of oxyethylene ether, 0.4 kg of polyacrylic acid, and 4 kg of hydrochloric acid solution (5% mass concentration). Among them, the particle size of bauxite, attapulgite, sodium bentonite, amorphous graphite and flake graphite is 300-500 mesh.

[0030] Weigh the polyvinyl butyral according to the above components, add an appropriate amount of isopropanol solvent, and stir thoroughly until the polyvinyl butyral is completely dissolved. Weigh bauxite, attapulgite, sodium bentonite, amorphous graphite, flake graphite and iron red. Add alkylphenol polyoxyethylene ether, polyacrylic acid, polyvinyl butyral solution and hydrochloric acid solution, put into the mill and stir evenly; add isopropanol solvent into the mill, the total amount of isopropanol added Adjust the density of the slurry at 130...

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Abstract

The invention discloses an alcohol-based paint for sand casting and a preparation method thereof. The density of the paint is 1200-1400 kg / m<3>, and the paint is composed of solutes and an organic solvent, wherein the organic solvent is one of methanol, ethanol and isopropanol or a mixture thereof; and the solutes include the following components in percentage by weight: 60-75% of alumina, 1-5% of attapulgite, 0.5-1.5% of sodium bentonite, 2-10% of amorphous graphite, 3-15% of lamellar graphite, 2-10% of iron red, 1-5% of polyvinyl butyral, 0.1-0.5% of surfactant, 0.1-0.5% of dispersant and 1-5% of hydrochloric acid solution. The alcohol-based paint is simple in preparation process, high in stability and easy to store.

Description

technical field [0001] The invention belongs to the technical field of sand casting, and in particular relates to an alcohol-based paint for sand casting and a preparation method thereof. Background technique [0002] With the development of the foundry industry, the requirements for the surface quality of cast workpieces are getting higher and higher. In order to improve the surface quality of sand castings, a layer of casting paint is usually applied to the working surface of the mold (core). Foundry coating is a kind of refractory coating, its main function is to block the direct contact between molten metal and sand mold (core) surface, eliminate the physical or chemical reaction between molten metal and sand mold (core) surface; effectively prevent and reduce the gradual surface sticking of sand , sand inclusions, sand holes and other defects; improve the surface strength of the casting mold (core); control the cooling rate of the casting to prevent shrinkage cavities...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22C9/02
Inventor 刘斌姚义俊沈国柱苏义盛群楼之栋
Owner NANJING UNIV OF INFORMATION SCI & TECH
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