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Bi-component epoxy resin binder, cast mixture containing bi-component epoxy resin binder, cast molding body and method for casting metal products

A technology of epoxy resin and binder, which is applied in casting molding equipment, casting molds, metal processing equipment, etc., can solve the problems of high scrap rate, poor toughness, thermal deformation, etc. The effect of improving the quality of castings

Active Publication Date: 2012-07-18
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The cold box binder for sulfur dioxide air blow hardening in the prior art, when mixed with casting aggregate to form resin sand mixture, has poor toughness, low high temperature strength, and is easy to heat when it is used to manufacture core molds for metal castings. Deformation, resulting in defects such as high scrap rate

Method used

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  • Bi-component epoxy resin binder, cast mixture containing bi-component epoxy resin binder, cast molding body and method for casting metal products
  • Bi-component epoxy resin binder, cast mixture containing bi-component epoxy resin binder, cast molding body and method for casting metal products
  • Bi-component epoxy resin binder, cast mixture containing bi-component epoxy resin binder, cast molding body and method for casting metal products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of Polyurethane Prepolymer

[0054] Put 185 kg of melted benzyl ether phenolic resin into the reaction kettle, heat and stir, dehydrate under vacuum (vacuum degree is 10 mm Hg), until the temperature reaches 120° C. without bubbles. Cool down to 60°C, add 15 kg of polymethylene polyphenyl polyisocyanate PM-200; adjust the reactor condenser to reflux state, heat up with steam under stirring, raise the temperature to 80°C within 30 minutes, and Insulate and react at 80-90°C for 180 minutes. After the heat preservation is over, cool the material down to below 60°C.

[0055] Preparation of Component I

[0056] 100 kg of the above polyurethane prepolymer, 450 kg of epoxy resin DER 331, 300 kg of trimethylolpropane triacrylate, 90 kg of dibutyl phthalate, 20 kg of aromatic hydrocarbon Solvesso 100 diluent were added to the mixing kettle, Start stirring and mix for about 2 hours to make the materials evenly mixed.

[0057] Preparation of Component II

[0058] ...

Embodiment 2

[0060] Preparation of Polyurethane Prepolymer

[0061] Put 25 kg of melted benzyl ether phenolic resin into the reaction kettle, heat and stir, dehydrate under vacuum (vacuum degree is 10mm Hg), until the temperature reaches 120°C and there are no bubbles. Cool down to 60°C, add 5 kg of polymethylene polyphenyl polyisocyanate PM-200; adjust the reactor condenser to reflux state, heat up with steam under stirring, and raise the temperature to 80°C within 30 minutes, and Insulate and react at 80-90°C for 180 minutes. After the heat preservation is over, cool the material down to below 60°C.

[0062] Preparation of Component I

[0063] 10 kg of the above polyurethane prepolymer, 800 kg of epoxy resin DER 331, 300 kg of trimethylolpropane triacrylate, 100 kg of dibutyl phthalate, 50 kg of aromatic hydrocarbon Solvesso 100 diluent were added to the mixing kettle, Start stirring and mix for about 2 hours to make the materials evenly mixed.

[0064] Preparation of Component II

...

Embodiment 3

[0067] Preparation of Polyurethane Prepolymer

[0068] Put 140 kg of melted benzyl ether phenolic resin into the reaction kettle, heat and stir, and dehydrate under vacuum (vacuum degree is 10 mm Hg), until the temperature reaches 120° C. without bubbles. Cool down to 60°C, add 10 kg of polymethylene polyphenyl polyisocyanate PM-200; adjust the reactor condenser to reflux state, heat up with steam under stirring, raise the temperature to 80°C within 30 minutes, and Insulate and react at 80-90°C for 180 minutes. After the heat preservation is over, the material is cooled to below 40°C.

[0069] Preparation of Component I

[0070] 100 kg of the above polyurethane prepolymer, 550 kg of epoxy resin DER 331, 200 kg of trimethylolpropane triacrylate, 60 kg of dibutyl phthalate, 20 kg of aromatic hydrocarbon Solvesso 100 diluent were added to the mixing kettle, Start stirring and mix for about 2 hours to make the materials evenly mixed.

[0071] Preparation of Component II

[00...

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Abstract

The invention discloses a bi-component epoxy resin binder, which mainly comprises the following components in parts by weight: 40-80 parts of epoxy resin (a), 1-30 parts of polyurethane prepolymer (b), 10-30 parts of acrylic ester (c) and 1-30 parts of diluent (d). The binder is of a bi-component system, and the acrylic ester and organic peroxides are separately stored. The polyurethane prepolymer is mixed with other components at the temperature of not higher than 60 DEG C. According to the invention, the binder with improved heat resistance and high-temperature toughness is prepared by taking the polyurethane prepolymer as a toughening component through an interpenetrating polymer network (IPN) synthesis method. The binder is used for manufacturing a die for casting metal castings, and thereby, the high-temperature strength of a core mold can be increased. The invention also provides a cast mixture containing the bi-component epoxy resin binder, a cast molding body obtained from the cast mixture, a method for casting metal products by using the molding body and the castings obtained by the method.

Description

technical field [0001] The invention relates to the field of polymer compositions, in particular to a binder for casting patterns and mandrels, the invention also relates to foundry mixtures and foundry shapes comprising the binder, and also to methods for casting metal articles And castings obtained by this method. Background technique [0002] In the foundry industry, the sulfur dioxide method is another air blowing cold box core making and molding method developed after the triethylamine method. [0003] The French SPAIC company invented the SO2-furan resin method in 1971. The process is: add an activator containing peroxide to the core sand, and when SO2 passes through the core sand, it combines with the new ecological oxygen released by the peroxide to form SO3, SO3 and water dissolved in the binder and sand generate sulfuric acid, which promotes the rapid exothermic polycondensation reaction of the resin and the rapid hardening of the sand core. The domestic custom is...

Claims

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Application Information

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