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Modified phosphate casting binder and preparation method and application thereof

A binder and phosphate technology, used in casting molding equipment, molds, manufacturing tools, etc., can solve the problems of poor chemical stability of binders, short use time of molding sand, fast curing reaction speed, etc., and achieve anti-hygroscopicity. Strong, reducing embrittlement, preventing crystallization and precipitation

Inactive Publication Date: 2013-09-18
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For example, the aluminum-phosphorus molar ratio of traditional aluminophosphate binders is between 0.29 and 0.3. In order to improve the moisture absorption resistance of the binder, the binder is required to have a higher aluminum-phosphorus molar ratio, and the aluminum-phosphorus molar ratio is required to be greater than >0.32, but it will bring problems such as poor chemical stability of the binder, too fast curing reaction speed and short usable time of molding sand (<5 minutes)
According to another study, when the moisture in the binder is high, that is, when the weight percentage of water is 25-30%, the storage stability of the self-hardening sand mold with phosphate binder is poor, that is, the prepared sand mold or sand core is not stable during storage. There are brittle phenomena, etc., and its bond strength is not as good as that of organic binders
Therefore, it is difficult to promote the application of traditional phosphate casting binders

Method used

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  • Modified phosphate casting binder and preparation method and application thereof
  • Modified phosphate casting binder and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Components of the modified phosphate foundry binder and their weight percentages:

[0044] Aluminum hydroxide 13% toothpaste grade,

[0045] The mass fraction is 63% of industrial phosphoric acid of 85%,

[0046] Boric Acid 1.5%, Borax 1%,

[0047] Citric Acid 1.8%, Ethanol 4.7%,

[0048] Water 15%.

[0049] The synthesis of the above-mentioned modified phosphate casting binder is carried out in a reaction kettle with a condenser, which can avoid the change of the concentration of the binder due to water evaporation. The modified phosphate casting binder is synthesized according to the following steps 200 g:

[0050] (1) First, add 126 grams of industrial phosphoric acid with a mass fraction of 85% into the reaction kettle, add 30 grams of water, heat to boiling, then slowly add 26 grams of aluminum hydroxide with a particle size of toothpaste grade, stir while adding, and finish adding After that, continue heating until a uniform and transparent solution is obtain...

Embodiment 2

[0062] Components of the modified phosphate foundry binder and their weight percentages:

[0063] Aluminum hydroxide 12% toothpaste grade,

[0064] 62% of industrial phosphoric acid with a mass fraction of 85%,

[0065] Boric Acid 2.4%, Borax 2%,

[0066] Citric Acid 2.4%, Ethanol 3.2%,

[0067] Water 16%.

[0068] The synthesis of the above-mentioned modified phosphate casting binder is carried out in a reaction kettle with a condenser, which can avoid the change of the concentration of the binder due to water evaporation. The modified phosphate casting binder is synthesized according to the following steps 200 g:

[0069] (1) First, add 124 grams of industrial phosphoric acid with a mass fraction of 85% into the reaction kettle, add 32 grams of water, heat to boiling, then slowly add 24 grams of aluminum hydroxide with a particle size of toothpaste grade, and stir while adding. , continue to heat until a uniform and transparent solution is obtained;

[0070] (2) Slowly...

Embodiment 3

[0081] Components of the modified phosphate foundry binder and their weight percentages:

[0082] Aluminum hydroxide 11% toothpaste grade,

[0083] 61% of industrial phosphoric acid with a mass fraction of 85%,

[0084] Boric Acid 3.2%, Borax 3%,

[0085] Citric Acid 2.8%, Ethanol 4%,

[0086] Water 15%.

[0087] The synthesis of the above-mentioned modified phosphate casting binder is carried out in a reaction kettle with a condenser, which can avoid the change of the concentration of the binder due to water evaporation. The modified phosphate casting binder is synthesized according to the following steps 200 g:

[0088] (1) First, add 122 grams of industrial phosphoric acid with a mass fraction of 85% into the reaction kettle, add 30 grams of water, heat to boiling, then slowly add 22 grams of aluminum hydroxide with a particle size of toothpaste grade, and stir while adding. , continue to heat until a uniform and transparent solution is obtained;

[0089] (2) Add 5.6 ...

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Abstract

The invention discloses a modified phosphate casting binder and a preparation method and application thereof. The modified phosphate casting binder is synthesized and prepared by a chemical reaction from the following components in percentage by weight: 9-15% of aluminum hydroxide, 60-65% of phosphoric acid, 1-5% of boric acid, 1-3% of borax, 1-5% of citric acid, 10-20% of water and 4-15% of ethanol. The obtained binder has good chemical stability, strong moisture absorption resistance and high bonding strength. The binder disclosed by the invention is suitable for preparing a self-hardening sand mould and has the characteristics of high bonding strength, long service time of a sand mould, good performance stability of the sand mould, easy collapse of the sand mould, normal-temperature regeneration of old sand and easy sand clearing of castings, and has broad application prospects in the casting industry.

Description

technical field [0001] The invention relates to a binder, in particular to a modified phosphate casting binder and its preparation method and application. Background technique [0002] The traditional phosphate casting binder has the advantages of environmental protection, its collapsibility reaches the level of organic resin, and it is possible to replace organic resin, but there are still many problems that hinder its application. [0003] For example, the aluminum-phosphorus molar ratio of traditional aluminophosphate binders is between 0.29 and 0.3. In order to improve the moisture absorption resistance of the binder, the binder is required to have a higher aluminum-phosphorus molar ratio, and the aluminum-phosphorus molar ratio is required to be greater than >0.32, but it will bring problems such as poor chemical stability of the binder, too fast curing reaction speed and short usable time of molding sand (<5 minutes). According to another study, when the moistur...

Claims

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Application Information

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IPC IPC(8): B22C1/18
Inventor 张友寿黄晋夏露李四年黄建波何丹
Owner HUBEI UNIV OF TECH
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