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Method for improving fluidity of water glass for casting through polyethylene glycol

A technology of polyethylene glycol and water glass, which is applied in the direction of casting molding equipment, casting molds, manufacturing tools, etc., and can solve the defects of casting pores, limited application range, strength of water glass sand, collapse fluidity and low recycling rate and other problems to achieve the effect of preventing aggregation growth, improving fluidity, improving surface potential energy and solvating ability

Active Publication Date: 2019-07-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the properties of water glass sand such as strength, collapsibility, fluidity and recycling rate are low, and its application range is greatly limited.
Organic binders such as furan resin and phenolic resin, which are widely used in sand casting, will release a large amount of gas when heated and decomposed during casting production, which will easily cause pore defects in castings. At the same time, toxic gases such as formaldehyde, toluene, phenol, and carbon monoxide in the gas will give Adverse effects on the environment and the health of workers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Water glass is carried out pretreatment, and step is as follows:

[0024] 1) Heat the water glass solution at 50°C for 40 minutes, and stir while heating;

[0025] 2) Cool the above water glass solution to 15°C to obtain the pretreated water glass solution.

[0026] At an ambient temperature of 25°C, weigh 30 g (modulus 2.0) of the pretreated water glass solution into a glass beaker, add water to dilute to a density of 1.2 g / ml, and then add polycarbonate with a molecular weight of 200 to it. Ethylene glycol, added in an amount of 0.6% of the diluted water glass solution quality, stirred until uniformly mixed.

[0027] Taking relative fluidity as the fluidity index, relative fluidity is the ratio of the flow time of a certain volume of deionized water in the measuring instrument to the flow time of the same volume of modified water glass solution. The greater the relative fluidity, the better the fluidity. The relative fluidity of the modified water glass binder is 0....

Embodiment 2

[0030] Described step (1) middle water glass is carried out pretreatment, and step is as follows:

[0031] 1) Heat the water glass solution at 70°C for 20 minutes, and stir while heating;

[0032] 2) Cool the above water glass solution to 20°C to obtain the pretreated water glass solution.

[0033] At an ambient temperature of 27°C, weigh 30g of pretreated water glass (modulus 2.8) into a glass beaker, add water to dilute to a density of 1.3g / ml, and then add polyethylene with a molecular weight of 200 to it. Glycol, the addition amount is 1.0% of the water glass solution quality after dilution, stirs until mixing evenly.

[0034] The relative fluidity measured by the method of example 1 of the modified water glass binder is 0.17. Compared with the unmodified sodium silicate sand prepared under the same conditions, it increased by 7.5%.

[0035] Prepare sample by example 1 method and measure the normal temperature tensile strength of modified water glass sand to reach 0.88M...

Embodiment 3

[0037] Described step (1) middle water glass is carried out pretreatment, and step is as follows:

[0038] 1) Heat the water glass solution at 100°C for 10 minutes, and stir while heating;

[0039] 2) Cool the above water glass solution to 27°C to obtain the pretreated water glass solution.

[0040] At an ambient temperature of 27°C, weigh 30 g (modulus 3.5) of the pretreated water glass solution into a glass beaker, add water to dilute to a density of 1.5 g / ml, and then add polycarbonate with a molecular weight of 200 to it. Ethylene glycol, added in an amount of 1.4% of the diluted water glass solution quality, stirred until uniformly mixed.

[0041] The relative fluidity measured by the method of example 1 of the modified water glass binder is 0.16, which improves by 1.2% compared with the unmodified water glass sand prepared under the same conditions.

[0042] Prepare sample by example 1 method and record that the normal temperature tensile strength of modified water gla...

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Abstract

The invention relates to a method for improving the fluidity of water glass for casting through polyethylene glycol. The method comprises the steps that the polyethylene glycol serves as a modifier tobe added in a water glass solution for making a reaction, and a modified water glass binder can be obtained; and under the same preparation conditions, compared with a water glass binder without thepolyethylene glycol modifier, the fluidity of the modified water glass binder is improved, the normal temperature tensile strength is improved, and the normal temperature flexure strength is reduced.The fluidity of the modified water glass binder is good, and the modified water glass binder is suitable for sand mold 3DP manufatcuring.

Description

technical field [0001] The invention relates to a method for improving the fluidity of water glass for casting by using polyethylene glycol, and belongs to the technical field of modification of water glass binder for sand casting. Background technique [0002] As an inorganic binder for sand casting, water glass is widely used in the production of cast steel and cast iron because there is almost no outgassing problem in casting production, and it is rich in resources and low in cost. However, the properties of water glass sand such as strength, collapsibility, fluidity and recycling rate are low, and its application range is greatly limited. Organic binders such as furan resin and phenolic resin, which are widely used in sand casting, will release a large amount of gas when heated and decomposed during casting production, which will easily cause pore defects in castings. At the same time, toxic gases such as formaldehyde, toluene, phenol, and carbon monoxide in the gas will...

Claims

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Application Information

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IPC IPC(8): B22C1/18B33Y70/00
CPCB22C1/188B33Y70/00
Inventor 盛晓波张鹏王晶晶董寅生储成林郭超黄志海
Owner SOUTHEAST UNIV
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