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Binder for casting core mould

A binder and casting mold technology, which is applied in casting molding equipment, casting molds, cores, etc., can solve the problems of scarring rejection rate, low thermal strength, sand washing and sand inclusion, etc. The effect of reducing the rate and improving the quality of castings

Active Publication Date: 2011-05-25
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When used in steel castings, the low thermal strength is likely to produce sand washing and sand inclusions, and scars cause high scrap rates and other defects

Method used

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  • Binder for casting core mould
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Embodiment 1-8

[0045] According to the ratio of raw materials listed in Table 1, according to the following method to prepare the cold box binder for sulfur dioxide blow hardening according to the present invention.

[0046] Put the melted benzyl ether phenolic resin into the reaction kettle, heat and stir, and dehydrate under vacuum (vacuum degree is 15mm Hg), until the temperature reaches 120°C and there are no bubbles. Cool down to 60°C, add polyisocyanate;

[0047] Adjust the condenser of the reaction kettle to the reflux state, heat up with steam under stirring, raise the temperature to 70°C within 30 minutes, and keep the reaction at 70-90°C for 180 minutes;

[0048] After the heat preservation is over, cool the material down to 60°C, add epoxy resin, raise the temperature in the kettle to 110°C within 60 minutes, and keep the temperature at 110-150°C for 180 minutes;

[0049] Cool down to 60°C, add acrylate, high-boiling point ester, and hydrocarbon diluent into the mixing kettle, st...

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Abstract

The invention discloses a binder for hardening by sulphur dioxide blowing, and the binder is used for curing by sulphur dioxide blowing in the presence of an organic peroxide activator. The binder disclosed by the invention comprises the following compositions in parts by weight: (a) 1-40 parts of benzylidenehydrazine, (b) 0.1-10 parts of polyisocyanate, (c) 40-80 parts of epoxy resin, (d) 20-30 parts of acrylic ester, and (e) 1-30 parts of high-boiling esters and / or hydrocarbon diluents. The binder disclosed by the invention can be used for overcoming the defects that the brittleness and resistance to heat and humidity of the binder for hardening by sulphur dioxide blowing in the prior art are poor, thereby improving the strength of a core sand mould when the binder is used in the process of casting, reducing the rejection ratio, and improving the quality of castings.

Description

technical field [0001] The present invention relates to resin materials, and more particularly to a binder for casting mandrels. Background technique [0002] In the foundry industry, the cold box method refers to the process of using gas or aerosol catalyst to catalyze resin sand at room temperature to achieve rapid solidification. According to different gas or aerosol catalysts, the cold box method can be divided into amine method, SO 2 Law, CO 2 Resin method and methyl formate method. [0003] French SPAIC company invented SO in 1971 2 - The furan resin method, known as the Hardox method, was used in casting production in 1975. The process is: add the activator containing peroxide into the core sand, when SO 2 When passing through the core sand, it combines with the nascent oxygen released by the peroxide to generate SO 3 , SO 3 Sulfuric acid is formed with water dissolved in the binder and sand, which promotes the rapid exothermic polycondensation reaction of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/24
Inventor 祝建勋许增彬
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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