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Quick-drying adhesive for casting sand mold

A technology of casting sand and adhesive glue, which is applied in the direction of casting molding equipment, casting molds, and casting mold components, and can solve the problem of repairing sand molds (core strength and drying time need to be improved, bonding strength and curing time are not ideal, castings Easy to produce porosity and other problems, to achieve the effect of short curing time, high bond strength, and reduce energy consumption

Inactive Publication Date: 2012-03-28
鑫工艺(上海)材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the existing sand adhesives use a mixture of oily adhesives and organic resins, and their bonding strength and curing time are not ideal
The traditional domestic sand mold adhesive is made of quartz powder, bentonite, tung oil, and water glass. There are several problems in the use of this adhesive: first, the sand mold must be dried at about 150°C after repairing. , consumes energy and reduces production efficiency; low bonding strength, easy to fall off, resulting in casting defects; large amount of gas generation, if the repair position is the inner cavity of the sand mold, directly in contact with the molten metal, the casting is prone to produce pores after pouring, affecting the quality; short shelf life
At present, there are also sand-type adhesives in China that use organic solvents such as alcohol as the carrier liquid and PVB as the binder, but the strength and drying time of repairing sand molds (cores) need to be improved

Method used

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  • Quick-drying adhesive for casting sand mold
  • Quick-drying adhesive for casting sand mold
  • Quick-drying adhesive for casting sand mold

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Experimental program
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Embodiment Construction

[0016] according to figure 1 The preparation process shown is to prepare sand mold quick-drying adhesive for foundry in proportion, and the weight ratio of its components is:

[0017] Rosin glyceride 30.3%~35.7%, phenolic resin 1.5~2.1%, nitrile rubber 7.5~11%, ethyl acetate 10.5%~13.5%, kaolin 13.9~15.6%, light calcium carbonate 7.5~9%, the rest is acetone.

[0018] Among the rosin glycerides described in C 23 h 36 o 4 Content ≥99.9%, its specific gravity is 1.1~1.3g / cm 3 ;

[0019] Described phenolic resin is a thermoplastic resin;

[0020] The relative molecular mass (ratio of one molecular mass to one carbon atom of 1 / 12) of the described nitrile rubber is 4000~6000, the acrylonitrile content is 28~35%, and the viscosity is 2500~3500cps;

[0021] The purity of the ethyl acetate ≥ 99.5%;

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Abstract

The invention discloses a quick-drying adhesive for a casting sand mold, which is characterized in that the quick-drying adhesive comprises the following components by weight percent: 30.3%-35.7% of rosin glycerides, 1.5-2.1% of phenolic resin, 7.5-11% of butadiene-acrylonitrile rubber, 10.5%-13.5% of ethyl acetate, 13.9-15.6% of kaolin, 7.5-9% of light calcium carbonate and the balance of acetone. Through a large number of tests and summarization, a bonding system with short curing time and high final strength under normal temperature is developed, the auxiliary curing process step is not required, the displacement can be prevented within 15 minutes after bonding the sand mold during the use, and the bonding strength at 24 hours can be improved to above 1MPa. The quick-drying adhesive is coated on the breakage and the section of the sand mold, thereby being capable of effectively providing the bonding strength which is not lower than that of the sand mold when the sand mold is intact within a short period of time, reducing the number of damages of the sand mold during the casting production process, avoiding the repeated labor and the waste of energy and material, and improving the production efficiency.

Description

technical field [0001] The invention relates to a casting material, in particular to a casting bonding material. Background technique [0002] Most of the existing sand adhesives use a mixture of oily adhesives and organic resins, and their bonding strength and curing time are not ideal. The traditional domestic sand mold adhesive is made of quartz powder, bentonite, tung oil, and water glass. There are several problems in the use of this adhesive: first, the sand mold must be dried at about 150°C after repairing. , consumes energy and reduces production efficiency; low bonding strength, easy to fall off, resulting in casting defects; large amount of gas generation, if the repair position is the inner cavity of the sand mold, directly in contact with the molten metal, the casting is prone to produce pores after pouring, affecting the quality; Short shelf life. At present, there are also sand-type adhesives in China that use organic solvents such as alcohol as the carrier l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J193/04C09J109/02C09J161/10C09J11/04B22C9/12
Inventor 卜伟施风华龚圣峰
Owner 鑫工艺(上海)材料科技有限公司
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