Inorganic binder, preparation method and application thereof

A binder and formula technology, applied in manufacturing tools, casting and forming equipment, metal processing equipment, etc., can solve the problems of long hot-hard heating time, reduced binder stability, short use time, etc., to reduce the work of workers. The effect of reducing the amount of dust, avoiding dust pollution and using a long time

Inactive Publication Date: 2013-05-22
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. In order to achieve the required density in the late stage of binder synthesis, it is necessary to repeatedly measure density - add water (or continue heating) - measure density - add water (or continue heating)... It takes a long time, is not conducive to production, and sometimes The adhesive becomes turbid after adding water, even if it is reheated, it still cannot reach a transparent state, which reduces the stability of the adhesive
[0006] 3. The hardening methods of phosphate sand are self-hardening and thermal hardening. The former causes a lot of dust pollution because the hardener is solid powder during sand mixing, and it is not easy to realize automatic quantitative feeding on the production line. The mixed sand can be used for a long time short
The latter has long heating time and high cost, and the heat-hardened sand mold (core) has poor storage stability due to moisture absorption. The use of high and medium neutrality binders can solve the problem of thermal hard sand mold (core) storage stability to a certain extent. However, the stability of the high and high neutrality binder itself is poor, crystals will precipitate during storage, and the quality of the binder will decline. The performance of the sand mold (core) thus prepared will be greatly reduced or even completely unusable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: the production and performance measurement of binder

[0022] Target: The components in the binder formula are 36 grams of 300 mesh aluminum hydroxide, 163 grams of phosphoric acid with a concentration of 85%, 8 grams of 300 mesh boric acid, 15 grams of 300 mesh magnesium carbonate, 10 grams of 300 mesh zinc oxide and 225 grams water.

[0023] resolve resolution:

[0024] First mix aluminum hydroxide and 60 grams of water into the container, start the agitator (until the end of the synthesis), heat to boiling, then slowly add phosphoric acid until the reactant is clear and transparent, then add boric acid until the reaction is transparent, and then add carbonic acid Mix magnesium with 110 grams of water and slowly add to the mixture until the reaction is transparent, then continue heating for 25-35 minutes, and finally mix zinc oxide with the remaining water and slowly add to the mixture until the solution is transparent Mucus, and then continue to heat...

Embodiment 2

[0026] Example 2: Sand cores with a wall thickness of 50mm were prepared by hot air curing

[0027] Method: Add 3% of the binder to the original sand, configure the molding sand, prepare a number of standard samples of φ50×50mm, and then pass in hot air at 200°C and a pressure of 0.15-0.25MPa for 2-3 minutes, then take the mold, and wait for it After cooling, test the compressive strength of the samples, randomly select 5 samples, and the compressive strengths are: 2.01MPa, 1.98MPa, 2.13MPa, 2.05MPa, 2.24MPa. Randomly select 3 samples and cut them longitudinally, it can be seen that the samples are completely hard.

Embodiment 3

[0028] Example 3: Prepare a sand core with a wall thickness of 30mm by hot air curing

[0029] Method: Add 3% of the binder to the original sand, configure the molding sand, prepare a number of samples of φ30×30mm, and then pass in hot air at 200°C and a pressure of 0.15-0.25MPa for 30-60s, take the mold, and wait for it to cool Test the compressive strength of the samples, randomly select 5 samples, the compressive strengths are: 1.65MPa, 1.88MPa, 2.22MPa, 1.79MPa, 1.80MPa. Randomly select 3 samples and cut them longitudinally, it can be seen that the samples are completely hard.

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PUM

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Abstract

The invention discloses a casting inorganic binder suitable for curing by hot air, a preparation method and application thereof, wherein the binder contains 30-40 parts of 200-400-mesh aluminium hydroxide, 140-180 parts of 80-90% phosphoric acid, 6-12 parts of 200-400-mesh boric acid, 10-20 parts of 200-400-mesh magnesium carbonate, 5-10 parts of 200-400-mesh zinc oxide, and 150-280 parts of water. The binder disclosed by the invention is cured by hot air; dust pollution of adding a powder curing agent when the sand is mixed is avoided; core sand can be used for a long period of time; no substance with poison or pungent odor is discharged in the whole process; the poured cast oil sand is easily cleaned; and the workload of a worker is reduced.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a casting inorganic binder suitable for hot air curing, a preparation method and an application thereof. Background technique [0002] At present, the binders used for molding and core making in foundry production are mainly divided into two categories: organic and inorganic. Organic binders (ie, organic resins) have high bonding strength, and the curing agent is liquid, which is convenient for automatic quantitative production. There is no dust pollution, but the organic resin sand produces toxic gases during the pouring process, such as dioxin, ammonia, sulfur dioxide, etc., causing serious environmental pollution and high cost. Inorganic binders meet the environment-friendly requirements proposed by the Party Central Committee. At present, clay and water glass are mostly used in production. Clay sand (mostly wet type) is generally used for modeling, and its strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/18
Inventor 夏露张友寿黄晋李四年何丹
Owner HUBEI UNIV OF TECH
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