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Binder coated refractories, casting mold using the same, and method of manufacturing casting mold using the same

Inactive Publication Date: 2012-08-30
LIGNYTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]According to this invention, the sugar group acts as the binder to bond the refractory aggregates with each other. In addition, if the sugar group is thermally decomposed, the sugar group emits the carbon dioxide gas and the water. Therefore, it is possible to reduce the emission of the harmful gas and reduce the environmental pollution. Further, the sugar group has a property of being thermally decomposed easily. Therefore, it is possible to produce the casting mold having a good breaking property with using the binder coated refractories.
[0048]Furthermore, according to the method of manufacturing the casting mold of this invention, it is possible to manufacture the casting mold with little environmental pollution.

Problems solved by technology

The novolac-type phenolic resin is not cured when heated.
However, “a part of the formaldehyde which is not reacted” and “most of ammonia” are volatilized into the atmosphere during and after producing the casting mold.
However, also in using the resol-type phenolic resin, the some formaldehyde is unreacted and is volatilized into the atmosphere.
Therefore, the resol-type phenolic resin has the above problem, too.
However, when pouring the molten metal into the casting mold, the heat in the molten metal degrades the phenol resin.
This also causes the problem of pollution.
In addition, the phenol resin has a large amount of residual carbon.
Therefore, even if pouring the molten metal into the casting mold to form the cast metal is performed, it is difficult to break the casting mold by the heat of the molten metal.
In addition, there is a need to apply the high-temperature heat over a long period to decompose the phenol resin.
That is, demolding the cast metal from the casting mold requires the additional work.

Method used

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  • Binder coated refractories, casting mold using the same, and method of manufacturing casting mold using the same
  • Binder coated refractories, casting mold using the same, and method of manufacturing casting mold using the same

Examples

Experimental program
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Effect test

example

[0086]Next, the example is specifically explained in the followings.

examples 1 to 9

[0087]The 30 kilograms flattery silica sand heated to 130 degrees C. was supplied to the whirlmixer. Then, the water solution of “the sugar group and the curing agent indicated in the Table 1” dissolved to or dispersed in the water of 450 grams was supplied to the whirlmixer. Then, the mixture is kneaded for 90 seconds. After breaking the mixture, the calcium stearate as the lubricant was added to the mixture. Then, the aeration was made to the mixture. In this manner, the binder coated refractories having the coating layer made of the sugar group was obtained. The binder coated refractories has the coating layer having the weight ratio of 2 percents by mass.

[0088]In addition, as shown in Table 1, the sugar group of the following was used.[0089]Dextrin (“No4-C”“No. 102-S”“ND-S” of NIPPON STARCH CHEMICAL Col. Ltd.)[0090]Enzyme Denaturation Dextrin (“Amycol No7-H”“Amycol No6-H”“amycol No3-L” of NIPPON STARCH CHEMICAL Col. Ltd.)[0091]White Superior Soft Sugar (Sucrose 98 percents by ma...

examples 10 to 13

[0092]The 30 kilograms flattery silica sand heated to 140 degrees C. was supplied to the whirlmixer. Then, the phenol resin indicated in Table 2 was added to the whirlmixer and then mixed with flattery silica sand. Then, the water solution of “the sugar group in Table 2” was dissolved to or dispersed in the water of 450 grams was added to the mixture of the flattery silica sand and the phenol resin. Then, kneading the mixture for 90 seconds was performed. Subsequently, the aeration was made, whereby the binder coated refractories having the coating layer including the sugar group and the phenol resin was produced. The binder coated refractories had the coating layer having the weight ratio of 2.0 percents by mass.

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Abstract

The binder coated refractories comprises the refractory aggregates and the solid-form coating layer which comprises the sugar group as the binder and which is provided to the surface of the refractory aggregates. According to this, the sugar group is used as the binder for bonding the refractory aggregates. Further, even if the sugar group is thermally decomposed, the sugar group emits the carbon dioxide and the water. Therefore, there is little likelihood of emitting the harmful gas. Therefore, it is possible to reduce the environmental pollution. Further, the sugar group is thermally decomposed easily. Therefore, it is possible to manufacture the casting mold having the good breaking property.

Description

TECHNICAL FIELD[0001]This invention relates to binder coated refractories used for manufacturing of a casting mold, a casting mold using the binder coated refractories, and a method of manufacturing the casting mold using the binder coated refractories.BACKGROUND ART[0002]Conventionally, there are a plurality of methods of manufacturing the casting mold. As to one of the method of manufacturing the casting mold, the shell molding method is well known. The shell molding method is a method for manufacturing the casting mold by bonding the refractory aggregates by the binder. The refractory aggregates are exemplified by silica sand. The shell molding method is realized as an effective method for producing the casting mold having a good dimensional accuracy. According to this reason, the shell molding method is frequently used when producing the casting mold.[0003]As to the binder for the shell molding method, the thermosetting resin such as phenol resin is generally used. The refractor...

Claims

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Application Information

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IPC IPC(8): B22C9/00C08L3/02
CPCB22C1/22B22C9/02B22C1/26B22C1/2253B22C9/12C09D103/02
Inventor IDE, ISAMUSEKI, TORUNISHIDA, SHINJI
Owner LIGNYTE CO LTD
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