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Sodium silicate chemical modification for casting and preparation and application thereof

A technology of chemical modifier and water glass, which is applied in casting molding equipment, molds, manufacturing tools, etc. It can solve the problems of high residual strength of molding sand and large amount of water glass added, so as to achieve simple and convenient synthesis process and improve performance Effect

Inactive Publication Date: 2008-09-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of large amount of water glass added into water glass sand and high residual strength of molding sand, the present invention provides a composition formula and preparation process steps of a water glass modifier that can effectively improve the cohesive force of water glass and delay the aging phenomenon of water glass and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 2g sodium carboxymethyl cellulose, 2g polyvinyl alkyl alcohol ether, 1.5g polyacrylamide, and 1g dextrin into 300ml water, heat and stir, stop heating after boiling for 30 minutes, stir and cool with 1:3.5 Mix the mass ratio with ordinary water glass, heat and stir, stop heating after boiling for 30 minutes, and cool to room temperature to obtain brown modified water glass; add 4% of the mass of molding sand to mix sand. After sample preparation, its performance was measured as follows: wet tensile strength 0.208MPa, 24-hour tensile strength 0.356MPa, which were 15.6% and 21.7% higher than the molding sand mixed with ordinary water glass; residual strength after burning at 800°C was 0.164MPa, It is 31.7% lower than the molding sand mixed with ordinary water glass.

Embodiment 2

[0030]Dissolve 2g of sodium carboxymethylcellulose, 1.5g of polyvinyl alkyl alcohol ether, 1g of polyacrylamide, and 1g of dextrin into 300ml of water, heat and stir, stop heating after boiling for 30 minutes, stir and cool with a ratio of 1:4 Mix the mass ratio with ordinary water glass, heat and stir, stop heating after boiling for 30 minutes, and cool to room temperature to obtain brown modified water glass; add 4% of the mass of molding sand to mix sand. After sample preparation, its performance was measured as follows: wet tensile strength 0.224MPa, 24-hour tensile strength 0.325MPa, which were 26.6% and 16.1% higher than the molding sand mixed with the same amount of ordinary water glass respectively; residual strength after burning at 800°C was 0.141 MPa, which is 41.2% lower than the molding sand mixed with ordinary water glass.

Embodiment 3

[0032] Dissolve 2g sodium carboxymethyl cellulose, 2g polyvinyl alkyl alcohol ether, 1.5g polyacrylamide, and 1g dextrin into 300ml water, heat and stir, stop heating after boiling for 30 minutes, stir and cool with 1:3.5 The mass ratio is mixed with ordinary water glass, heated and stirred, and the heating is stopped after boiling for 30 minutes, and cooled to room temperature to obtain a brown modified water glass solution; remove the dense gel film on the surface of the solution, add 55g dipotassium hydrogen phosphate, 2g ten Dialkyl sodium sulfate and 14g of nano-montmorillonite were stirred at room temperature for 1 hour to obtain multiple chemical compound modified water glass. Mix sand with 4% of the mass of molding sand. After sample preparation, its properties were determined as follows: wet tensile strength 0.252MPa, 24-hour tensile strength 0.414MPa, which were 40.0% and 41.9% higher than the molding sand mixed with the same amount of ordinary water glass respective...

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Abstract

The invention provides a soluble glass chemical modifying agent used for casting and a preparation method; the components of the invention comprise 0.1 to 1 percent of sodium carboxymethyl cellulose, 0.1 to 1 percent of polyethylene alkyl alcohol, 0.1 to 1 percent of polyacrylamide and 0.1 to 1 percent of dextrine of the relative mass of the sodium soluble glass. On the basis, the invention can also comprise 1 to 8 percent of dipotassium hydrogen phosphate, 0.1 to 1 percent of sodium dodecyl sulfate (or alkyl sodium sulfonate) or 1 to 6 percent of nano-meter montmorillonite. The preparation method includes: dissolving the organic components into water, heating and stirring, cooling to obtain a compound modifying agent; adding the compound modifying agent into the soluble glass according to a certain proportion, heating and stirring, cooling to obtain the organic modified soluble glass; adding the inorganic components into the organic modified soluble glass, stirring uniformly to obtain a chemical compound modifying soluble glass. Applying the organic modified soluble glass of the invention can enhance the mould strength and improve the sand collapsibility. The prepared modifying agent has the powerful market competitiveness and the value of application owing to the low manufacturing cost and the excellent performance.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a water glass chemical modifier for casting, a modification process and application. Background technique [0002] Water glass sand is one of the main modeling materials used in casting production. Compared with other molding sand, molding with it has the advantages of no (or less) dust pollution, non-toxicity, good fluidity of molding sand, easy compaction, low labor intensity, simple operation, low energy consumption, high hardening strength, and good dimensional accuracy. . However, in some domestic foundries at present, due to the different quality of water glass used for casting, they have to rely on increasing the amount of water glass added to ensure the strength of the sand mold, resulting in high residual strength of the molding sand, poor collapsibility, and old sand. Technical problems such as poor reusability. In addition, there is also an "aging" phenomenon in whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02C08L1/26C08L33/26C08L3/02C08K3/32C08K5/42C08K3/34
Inventor 张希俊张方谈剑
Owner KUNMING UNIV OF SCI & TECH
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