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
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[0052] Example 1
[0053] Preparation of polyurethane prepolymer
[0054] Put 185 kg of melted benzyl ether phenolic resin into the reaction kettle, heat and stir, and dehydrate under vacuum (vacuum degree is 10mm 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, add steam under stirring to increase the temperature, and raise the temperature to 80°C within 30 minutes, and Incubate the reaction at 80-90°C for 180 minutes. After the heat preservation is over, the material is cooled to below 60°C.
[0055] Preparation of component I
[0056] Add 100 kg of the above polyurethane prepolymer, add 450 kg of epoxy resin DER 331, 300 kg of trimethylolpropane triacrylate, 90 kg of dibutyl phthalate, and 20 kg of aromatic Solvesso 100 diluent into the mixing kettle. Start stirring and mix for about 2 hours to make the materials evenly mixed.
[0057] Preparation ...
Example Embodiment
[0059] Example 2
[0060] Preparation of polyurethane prepolymer
[0061] Put 25 kilograms of the melted benzyl ether phenolic resin into the reaction kettle, heat and stir, and dehydrate under vacuum (vacuum degree is 10mm Hg) until the temperature reaches 120°C without bubbles. Cool down to 60°C, add 5 kg of polymethylene polyphenyl polyisocyanate PM-200; adjust the reactor condenser to reflux state, add steam under stirring to increase the temperature, raise the temperature to 80°C within 30 minutes, and Incubate the reaction at 80-90°C for 180 minutes. After the heat preservation is over, the material is cooled to below 60°C.
[0062] Preparation of component I
[0063] Add 10 kg of the above polyurethane prepolymer, 800 kg of epoxy resin DER 331, 300 kg of trimethylolpropane triacrylate, 100 kg of dibutyl phthalate, and 50 kg of aromatic Solvesso 100 diluent into the mixing kettle. Start stirring and mix for about 2 hours to make the materials evenly mixed.
[0064] Preparation...
Example Embodiment
[0066] Example 3
[0067] Preparation of polyurethane prepolymer
[0068] Put 140 kilograms of melted benzyl ether phenolic resin into the reaction kettle, heat and stir, and dehydrate under vacuum (vacuum degree is 10mm 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, add steam under stirring to increase the temperature, raise the temperature to 80°C within 30 minutes, and Incubate the reaction 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] Add 100 kg of the above polyurethane prepolymer, add 550 kg of epoxy resin DER 331, 200 kg of trimethylolpropane triacrylate, 60 kg of dibutyl phthalate, and 20 kg of aromatic Solvesso 100 diluent into the mixing kettle. Start stirring and mix for about 2 hours to make the materials evenly mixed.
[0071] Preparati...
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