Lost foam paint and method for producing the same

A technology of lost foam and paint, applied in the direction of manufacturing tools, coatings, casting and molding equipment, etc., can solve problems such as damage, difficult operation of paint, shape deformation, etc., to simplify the cleaning process, save the cleaning process, and achieve the effect of good flow parallelism.

Inactive Publication Date: 2009-08-05
杨玉光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0008] Example 1

[0009] Mix 15 kilograms of high alumina powder, 60 kilograms of quartz powder, 30 kilograms of olivine, 1 kilogram of sodium hexametaphosphate, 3 kilograms of cryolite and 5 kilograms of iron oxide in a roller rotor sand mixer for 1.5 to 3 hours. Gradually add water to make it fluffy.

[0010] Then 3 kg of B01 water-soluble resin solution and 1.5 kg of sodium carboxymethyl cellulose are made into a 3-10% aqueous solution. 5 kg of bentonite is activated by 0.25 kg of sodium carbonate and then added to the sand mixer and mixed with the above materials. 1.5 to 3 hours to make it into paint paste.

[0011] Put the mixed paint paste into a mixer, then add 80 g of Tween-80, 10 g of n-octanol and 80 kg of water, stir and mix for 0.5 to 2 hours to form a viscous paste.

Example Embodiment

[0012] Example 2

[0013] Mix 20 kilograms of high alumina powder, 58 kilograms of quartz powder, 26 kilograms of olivine, 0.5 kilograms of sodium hexametaphosphate, 2 kilograms of cryolite and 4.5 kilograms of iron oxide in a roller rotor sand mixer for 1.5 to 3 hours. Gradually add water to make it fluffy.

[0014] Then, 2 kg of B01 water-soluble resin solution and 1.4 kg of sodium carboxymethyl cellulose are made into a 3-10% aqueous solution. 4 kg of bentonite is activated by 0.2 kg of sodium carbonate and then added to the sand mixer and mixed with the above materials. 1.5 to 3 hours to make it into paint paste.

[0015] Put the mixed paint paste into a mixer, then add a 70x pan, 8 g of n-octanol and 70 kg of water, stir and mix for 0.5 to 2 hours to form a viscous paste.

Example Embodiment

[0016] Example 3

[0017] Mix 25 kilograms of high alumina powder, 56 kilograms of quartz powder, 26 kilograms of olivine, 1 kilogram of sodium hexametaphosphate, 1 kilogram of cryolite and 4 kilograms of iron oxide in a roller rotor sand mixer for 1.5 to 3 hours. Gradually add water to make it fluffy.

[0018] Then 3 kg of polyvinyl alcohol resin solution and 1.2 kg of sodium carboxymethyl cellulose are made into a 3-10% aqueous solution. 3.5 kg of bentonite is activated by 0.175 kg of sodium carbonate and then added to the sand mixer and mixed with the above materials. 1.5 to 3 hours to make it into paint paste.

[0019] Put the mixed paint paste into a mixer, then add 60 g of Tween-80, 6 g of n-octanol and 75 kg of water, stir and mix for 0.5 to 2 hours to form a viscous paste.

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PUM

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Abstract

The invention discloses an expendable pattern casting (EPC) coating and a method for producing the same. The EPC coating comprises a refractory aggregate, a bonding agent, a suspending agent, a wetting agent, a defoaming agent, an addition agent and a dispersing agent, wherein the refractory aggregate comprises high aluminum powder, quartz powder and olivine powder; the bonding agent comprises B01 water soluble resin or polyvinyl alcohol resin aqueous solution, polyvinyl acetate emulsion, bentonite and sodium hexametaphosphate; the suspending agent comprises sodium carboxymethyl cellulose; the wetting agent comprises tween or/and span; the defoaming agent comprises monobasic alcohol octanol; the addition agent comprises sodium carbonate, cryolite and ferric oxide powder; and the dispersing agent is water. The EPC coating has the advantages that by selecting proper coating components and adjusting the contents thereof, and selecting a proper mixing process, the normal temperature and high temperature strengths, the suitable high temperature air permeability, and the excellent flow parallel and suspension properties and the brushability for a coating layer are completely satisfied. The coating is applicable to gray cast iron pieces with different brands, and particularly the coating layer sheds off automatically and gradually in the cooling process of a cast after pouring and mold dismantling so that the surface of the cast is bright and clean, and the process for cleaning the cast is greatly simplified and saved.

Description

technical field [0001] The invention belongs to the engineering field of auxiliary materials for casting, and specifically relates to a lost foam coating and a manufacturing method thereof. Background technique [0002] 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 casting cavities in addition to the above two functions, so it must have a high Excellent room temperature strength, high temperature strength and suitable high temperature air permeability. [0003] Although the lost foam casting process has developed rapidly since its inception, the coating technolo...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C9/04
Inventor 杨玉光廖希亮董利
Owner 杨玉光
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