Furan resin for casting and production method thereof
A technology of furan resin and reaction device, which is applied in the field of sand casting, can solve problems such as low strength, affecting use, and poor adhesion, and achieve the effects of reducing damage, improving safety, and good strength
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Embodiment 1
[0044] Add 30 parts of furfuryl alcohol, 200 parts of water, and 18 parts of formaldehyde into the reaction device, and mix them evenly. After preliminary mixing, control the temperature of the reaction device to raise the temperature of the reaction device to 100°C, and then add 10 parts of Urea, 6 parts of copper-zinc catalyst with a copper-zinc ratio of 1:1.5 and 2 parts of magnesium promoter, after stirring evenly, adjust the pH of the mixture to 10 with alkaline solution such as sodium hydroxide or potassium hydroxide, and perform addition reaction at 100°C After 1.5 hours, then add 30 parts of furfuryl alcohol to the reaction device, and adjust the pH of the mixture to 6 with an acid solution such as hydrochloric acid solution or nitric acid solution, and carry out polycondensation reaction at 100°C for 1 hour;
[0045] After the polycondensation reaction is completed, add the remaining 15 parts of urea, 8 parts of formaldehyde reducing agent and 4 parts of oxidized starc...
Embodiment 2
[0058] Add 25 parts of furfuryl alcohol, 150 parts of water, and 20 parts of formaldehyde into the reaction device, and mix them evenly. After preliminary mixing, control the temperature of the reaction device to raise the temperature of the reaction device to 100°C, and then add 12 parts of Urea, 10 parts of copper-zinc catalyst with a copper-zinc ratio of 1:1.5 and 2 parts of magnesium promoter, after stirring evenly, adjust the pH of the mixture to 10 with alkaline solution such as sodium hydroxide or potassium hydroxide, and perform addition reaction at 100°C After 1.5 hours, add 25 parts of furfuryl alcohol to the reaction device, adjust the pH of the mixture to 6 with an acid solution such as hydrochloric acid solution or nitric acid solution, and carry out polycondensation reaction at 100°C for 1 hour;
[0059] After the polycondensation reaction is completed, add the remaining 18 parts of urea, 10 parts of formaldehyde reducing agent and 5 parts of oxidized starch into ...
Embodiment 3
[0072] Add 15 parts of furfuryl alcohol, 100 parts of water, and 10 parts of formaldehyde into the reaction device, and mix them evenly. After preliminary mixing, control the temperature of the reaction device to raise the temperature of the reaction device to 100°C, and then add 8 parts of Urea, 5 parts of copper-zinc catalyst with a copper-zinc ratio of 1:1.5 and 1 part of magnesium promoter, after stirring evenly, adjust the pH of the mixture to 10 with alkaline solution such as sodium hydroxide or potassium hydroxide, and perform addition reaction at 100°C After 1.5 hours, then add 20 parts of furfuryl alcohol to the reaction device, and adjust the pH of the mixture to 6 with an acid solution such as hydrochloric acid solution or nitric acid solution, and carry out polycondensation reaction at 100°C for 1 hour;
[0073] After the polycondensation reaction is completed, add the remaining 12 parts of urea, 5 parts of formaldehyde reducing agent and 2 parts of oxidized starch ...
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