Preparation method of water-based coating for lost foam casting

A lost foam casting, water-based technology, applied in casting molding equipment, coatings, casting molds, etc., can solve the problem that the quality of the coating cannot meet the lost foam casting process, the coating does not have suitable high temperature air permeability, and the strength at room temperature cannot meet the requirements, etc. problems, to achieve good suspension and thixotropy, high surface strength, and good quality of finished products

Active Publication Date: 2012-03-07
南通江海港建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the lost foam casting process has developed rapidly since its inception, the coating technology has been plagued by the fact that it is difficult to greatly improve the casting yield. The main reason is that the quality of the coating cannot meet the requirements of the lost foam casting process.
One is that the strength at room temperature does not meet the requirements, and the shape is deformed and the coating is damaged during molding, so that the casting is scrapped; the other is that the high-temperature strength is low, and the casting cavity collapses, damages, and paint peeling occurs during pouring, so that the casting is scrapped; the third is that the coating is not suitable. High temperature air permeability, too high air permeability will cause the cavity to collapse, and too low air permeability will cause casting defects such as pores, wrinkled skin, and slag inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of water-based paint for lost foam casting, the method comprising the steps of:

[0025] 1) Weigh the ingredients:

[0026] Weigh the following substances by weight percentage, 18% of 150-200 mesh mullite powder, 6% of 80-150 mesh quartz powder, 15% of 200-320 mesh bauxite, 1.2% of silica sol, 2.5% of polyvinyl acetate milk , 0.3% sodium carboxymethyl cellulose, 0.2% sodium alkylbenzene sulfonate, 0.2% sodium sulfate, 0.2% n-octanol, 0.15% fatty alcohol polyoxyethylene ether, and the balance is water;

[0027] 2) Coating preparation:

[0028] a. Stir the mullite powder, quartz powder and bauxite base material in the paint grinding equipment, then add 30% of the total water to the base material, wet the base material and stir it;

[0029] b. Add silica sol, polyvinyl acetate milk, sodium carboxymethyl cellulose, sodium alkylbenzene sulfonate, sodium sulfate, n-octanol, and fatty alcohol polyoxyethylene ether to the base material that has been wette...

Embodiment 2

[0032] A preparation method of water-based paint for lost foam casting, the method comprising the steps of:

[0033] 1) Weigh the ingredients:

[0034] Weigh the following substances by weight percentage, 18% of 150-200 mesh mullite powder, 6% of 80-150 mesh quartz powder, 15% of 200-320 mesh bauxite, 1.2% of silica sol, 2.5% of polyvinyl acetate milk , 0.3% sodium carboxymethyl cellulose, 0.2% sodium alkylbenzene sulfonate, 0.2% sodium sulfate, 0.2% n-octanol, 0.15% fatty alcohol polyoxyethylene ether, and the balance is water;

[0035] 2) Coating preparation:

[0036] a. Stir the mullite powder, quartz powder and bauxite base material in the paint grinding equipment, then add 35% of the total water to the base material, wet the base material and stir it;

[0037] b. Add silica sol, polyvinyl acetate milk, sodium carboxymethyl cellulose, sodium alkylbenzene sulfonate, sodium sulfate, n-octanol, and fatty alcohol polyoxyethylene ether to the base material that has been wette...

Embodiment 3

[0040] A preparation method of water-based paint for lost foam casting, the method comprising the steps of:

[0041] 1) Weigh the ingredients:

[0042] Weigh the following substances by weight percentage, 18% of 150-200 mesh mullite powder, 6% of 80-150 mesh quartz powder, 15% of 200-320 mesh bauxite, 1.2% of silica sol, 2.5% of polyvinyl acetate milk , 0.3% sodium carboxymethyl cellulose, 0.2% sodium alkylbenzene sulfonate, 0.2% sodium sulfate, 0.2% n-octanol, 0.15% fatty alcohol polyoxyethylene ether, and the balance is water;

[0043] 2) Coating preparation:

[0044] a. Stir the mullite powder, quartz powder and bauxite base material in the paint grinding equipment, then add 40% of the total water to the base material, wet the base material and stir it;

[0045] b. Add silica sol, polyvinyl acetate milk, sodium carboxymethyl cellulose, sodium alkylbenzene sulfonate, sodium sulfate, n-octanol, and fatty alcohol polyoxyethylene ether to the base material that has been wette...

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Abstract

The invention discloses a preparation method of a water-based coating for lost foam casting. A coating prepared by the preparation method has excellent performances, good suspensibility, thixotropy and permeability, and high surface strength. The preparation method overcomes the defects that refractory powder adopted by the conventional casting coating preparation technology is very expensive and a coating production cost of the conventional casting coating preparation technology is high. A casting coating obtained by the preparation method is smooth and has appropriate viscosity. Through the preparation method, a high-quality casting coating can be prepared from cheap raw materials through simple production processes. Therefore, the preparation method reduces a coating production cost and realizes good finished product quality.

Description

technical field [0001] The invention relates to the field of casting, in particular to the field of coating for lost foam casting. Background technique [0002] With its unique advantages, lost foam casting is known as "green casting technology" and "21st century casting technology". Since its application in my country in the 1960s, after decades of continuous development, the application field of lost foam casting has been continuously expanded, and good economic and social benefits have been obtained. [0003] Lost foam casting coating is one of the two key technologies of lost foam casting process. The performance of the coating directly affects the quality of the casting, which is significantly different from the traditional sand casting coating. The main purpose of traditional sand casting coatings is to prevent castings from mechanical sand sticking and chemical sticking sand, while coatings for lost foam casting have an important role in forming and maintaining cast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
Inventor 许立新
Owner 南通江海港建设工程有限公司
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