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A dry powder lost foam casting coating

A lost foam casting and coating technology, which is applied to casting molding equipment, coatings, casting molds, etc., can solve the problems of insufficient coating strength, easy delamination, poor suspension, etc. The effect of long shelf life

Active Publication Date: 2019-12-27
桃江新兴管件有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current lost foam coatings still have the following problems: 1) most of the lost foam coatings on the market are in a slurry state, and the binder of the lost foam coatings is basically organic matter. Due to the presence of water, the microorganisms reproduce obviously, and the coatings are placed for a long time. , is easily spoiled, so the shelf life is short
2) The strength of the coating is not enough, which leads to cracking of the coating, which in turn leads to sticky sand during pouring
3) Poor suspensibility, prone to stratification during use

Method used

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  • A dry powder lost foam casting coating
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare 73 parts of high-alumina powder with a particle size of 280-320 mesh, 17 parts of zircon powder with a particle size of 280-300 mesh, 8 parts of sepiolite with a particle size of 280-320 mesh, and a sodium base with a particle size of 280-320 mesh. 2 parts of bentonite, 1.2 parts of sodium methylene dinaphthalene sulfonate, 2 parts of sodium pyrophosphate, 2.4 parts of yellow dextrin, 1 part of potato flour. First add high alumina powder, zircon powder, sepiolite, and sodium bentonite into the mill for the first grinding to obtain mixture A, then mix mixture A, sodium methylene dinaphthalene sulfonate, and sodium pyrophosphate , yellow dextrin, and potato flour are added into the mill and milled for the second time to obtain mixture B, which is the dry powder lost foam casting coating; the pressure of the first milling is 40MPa, and the milling speed is 800rpm. The grinding time is 30 minutes; the pressure of the second grinding is 20 MPa, the grinding speed is ...

Embodiment 2

[0032] Prepare 74 parts of high-alumina powder with a particle size of 240-320 mesh, 18 parts of zircon powder with a particle size of 240-320 mesh, and 9 parts of sepiolite with a particle size of 240-320 mesh. 3 parts of 240-320 mesh sodium bentonite, 1.4 parts of sodium methylene dinaphthalene sulfonate, 3 parts of sodium pyrophosphate, 3 parts of yellow dextrin, 1.2 parts of potato flour. First add high alumina powder, zircon powder, sepiolite, and sodium bentonite into the mill for the first grinding to obtain mixture A, then mix mixture A, sodium methylene dinaphthalene sulfonate, and sodium pyrophosphate , yellow dextrin, and potato flour are added to the mill for the second milling to obtain mixture B, which is the dry powder lost foam casting coating;

[0033] The first milling pressure is 38MPa, the milling speed is 700rpm, and the milling time is 28min; the second milling pressure is 19MPa, the milling speed is 480rpm, and the milling time is 28min.

Embodiment 3

[0035] Prepare 70 parts of high-alumina powder with a particle size of 200-320 mesh, 15 parts of zircon powder with a particle size of 200-320 mesh, and 7 parts of sepiolite with a particle size of 200-320 mesh. 1 part of 200-320 mesh sodium bentonite, 0.65 parts of sodium methylene dinaphthalene sulfonate, 1.2 parts of sodium pyrophosphate, 1.5 parts of yellow dextrin, 1 part of potato flour; Add stone and sodium bentonite to the mill for the first milling to obtain mixture A, then add mixture A, sodium methylene dinaphthalene sulfonate, sodium pyrophosphate, yellow dextrin, and potato flour into the mill Carry out the second milling to obtain the mixture B, which is the dry powder lost foam casting coating; the pressure of the first milling is 30MPa, the milling speed is 600rpm, and the milling time is 20min; the second milling The milling pressure is 10 MPa, the milling speed is 400 rpm, and the milling time is 20 minutes.

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Abstract

The invention discloses dry powder lost foam casting coating and a preparation method thereof. The dry powder lost foam casting coating is composed of following raw materials of, by weight, 70-76 parts of high aluminum powder, 15-19 parts of zircon powder, 7-9 parts of meerschaum, 1-3 parts of sodium bentonite, 0.6-1.5 parts of dispersing agents NNO, 1.2-3 parts of sodium pyrophosphate, 1.5-3 parts of yellow dextrin, 1-1.5 parts of potato powder, and 0.01-0.03 part of antifoaming agent. According to the obtained dry powder lost foam casting coating, the coating thickness is even, a coating isflat, the high-temperature strength is high, and the coating hanging performance is excellent.

Description

technical field [0001] The invention belongs to the field of lost foam casting, and in particular relates to a dry powder lost foam casting coating. 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] Coating is an indispensable process in the lost foam casting process. The performance and production cost of the coating determine whether the casting technology can meet the actual needs of the enterprise, and the quality and surface roughness of the lost foam castings are largely Depending on the quality of coatings, there is a saying abroad that coatings are casting molds. Therefore, coatings have become a hot spot in the lost foam casting proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 符坚侯永先傅利呼冠军
Owner 桃江新兴管件有限责任公司
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