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Epoxy resin bi-component binding agents modified by polyurethane

A technology of polyurethane modification and epoxy resin, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problems of scarring reject rate, low resin strength, sand washing and sand inclusion, etc., and achieve remarkable casting quality, Improvement of resin strength and improvement of casting quality

Active Publication Date: 2011-07-06
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the prior art, the cold box binder for sulfur dioxide blow hardening is greatly affected by environmental factors, has poor heat and humidity resistance, is brittle, and has low resin strength. Defects such as sand inclusion and scarring cause high rejection rate

Method used

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  • Epoxy resin bi-component binding agents modified by polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of Polyurethane Modified Epoxy Resin

[0045] (1) Put 180 kg of melted benzyl ether phenolic resin into the reaction kettle, heat and stir, and dehydrate under vacuum (vacuum degree is 15 mm Hg), until the temperature reaches 120 °C without bubbles. Cool down to 60°C, add 15 kg of polyisocyanate PM-200;

[0046] (2) Adjust the condenser of the reaction kettle to the reflux state, pass steam under stirring to raise the temperature, raise the temperature to 70°C within 30 minutes, and keep the temperature at 70-90°C for 180 minutes;

[0047] (3) After the heat preservation is over, cool the material to 60°C, add 805 kg of epoxy resin DER 331, raise the temperature in the kettle to 110°C within 60 minutes, and keep the temperature at 110-150°C for 180 minutes, then cool down, That is to obtain polyurethane modified epoxy resin.

[0048] Preparation of Component I: Add 600 kg of the above polyurethane modified epoxy resin, 260 kg of trimethylolpropane triacryl...

Embodiment 2

[0051] Preparation of Polyurethane Modified Epoxy Resin

[0052] (1) Put 160 kg of melted benzyl ether phenolic resin into the reaction kettle, heat and stir, 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 20 kg of polyisocyanate PM-200;

[0053] (2) Adjust the condenser of the reaction kettle to the reflux state, pass steam under stirring to raise the temperature, raise the temperature to 70°C within 30 minutes, and keep the temperature at 70-90°C for 180 minutes;

[0054] (3) After the heat preservation is over, cool the material to 60°C, add 820 kg of epoxy resin DER 331, raise the temperature in the kettle to 110°C within 60 minutes, and keep the temperature at 110-150°C for 180 minutes, then cool down, That is to obtain polyurethane modified epoxy resin.

[0055] Preparation of component I: Add 630 kilograms of the above-mentioned polyurethane modified epoxy resin, 200 kilograms of ...

Embodiment 3

[0058] Preparation of Polyurethane Modified Epoxy Resin

[0059] (1) Put 134 kg of melted benzyl ether phenolic resin into the reaction kettle, heat and stir, and dehydrate under vacuum (vacuum degree is 15 mm Hg), until the temperature reaches 120 ° C without bubbles. Cool down to 60°C, add 16 kg of polyisocyanate PM-200;

[0060] (2) Adjust the condenser of the reaction kettle to the reflux state, pass steam under stirring to raise the temperature, raise the temperature to 70°C within 30 minutes, and keep the temperature at 70-90°C for 180 minutes;

[0061] (3) After the heat preservation is over, cool the material to 60°C, add 850 kg of epoxy resin DER 331, raise the temperature in the kettle to 110°C within 60 minutes, and keep the temperature at 110-150°C for 180 minutes, then cool down, That is to obtain polyurethane modified epoxy resin.

[0062] The preparation of component I: 610 kilograms of above-mentioned polyurethane modified epoxy resins, 220 kilograms of trime...

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Abstract

The invention discloses an epoxy resin bi-component binding agent system modified by polyurethane. The epoxy resin bi-component binding agent system is characterized in that the binding agent system blows gaseous sulfur dioxide for solidification, and the binding agent system comprises the following components in percentage by weight: (a) 1 to 40 parts of benzyl ether phenolic resin; (b) 0.1 to 10 parts of polymeric isocyanate; (c) 40 to 80 parts of epoxy resin; (d) 20 to 30 parts of acrylate; (e) 1 to 30 parts of high boiling ester and / or hydrocarbon thinners; and (f) 15 to 75 parts of organic peroxide. The epoxy resin bi-component binding agent system modified by polyurethane overcomes the disadvantages in the prior art that cold box binding agents adopting sulfur dioxide for blowing hardening have fragility and bad temperature resistance, can improve the strength of a sand core and a sand mold during the casting and using process, reduces the rejection rate, and improves the casting quality.

Description

technical field [0001] The invention relates to a binder, which is used for casting resin sand mixture, solidified by blowing gaseous sulfur dioxide to form a core mold for manufacturing metal castings, and is suitable for various types of cast steel, cast iron and non-ferrous alloy parts in the foundry field . Background technique [0002] In the foundry industry, the cold box method refers to the process of using gas or aerosol catalyst to catalyze the instantaneous solidification of resin sand at room temperature. 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 ...

Claims

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Application Information

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IPC IPC(8): B22C1/22
Inventor 许增彬祝建勋
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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