Method for producing hot-box resin for casting
A production method and hot core box technology, which are applied in casting molding equipment, casting molds, cores, etc., can solve the problems of fast gas generation, unstable strength, and inability to overcome, and achieve improved product performance, smooth appearance, Fast curing effect
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[0027] Embodiment 1: A method for producing hot core box resin for casting, characterized in that the weight percentage of its raw materials is: aqueous formaldehyde solution: 45%, urea: 4%, phenol: 18%, furfuryl alcohol: 57%, Modifier: 2%, enhancer 0.4%
[0028] The method includes the following steps:
[0029] a. Heat the above amount of phenol to melt and dissolve, add it to the reactor, start the mixer, add the above amount of formaldehyde aqueous solution and furfuryl alcohol in sequence, and use NaOH lye to adjust the pH of the feed solution to 9-10;
[0030] b. Open the steam valve, heat up to 90-95℃ within 40-60 minutes, keep the temperature for 60 minutes;
[0031] c. Add 1 / 2 of the amount of NaOH lye in one step, 90-95℃, keep the temperature for 30 minutes;
[0032] d. After the heat preservation is completed, the temperature is lowered to 80°C, the pH value is adjusted to 4.5-5.5 with formic acid, and the vacuum dehydration is performed. The dehydration amount is 70% of the ...
Example Embodiment
[0038] Embodiment 2: A method for producing hot core box resin for casting, characterized in that the weight percentages of its raw materials are: aqueous formaldehyde solution: 55%, urea: 6%, phenol: 22%, furfuryl alcohol: 48%, Modifier: 4%, enhancer 0.6%
[0039] The method includes the following steps:
[0040] a. Heat the above amount of phenol to melt and dissolve, add it to the reactor, start the mixer, add the above amount of formaldehyde aqueous solution and furfuryl alcohol in sequence, and use NaOH lye to adjust the pH of the feed solution to 9-10;
[0041] b. Open the steam valve, heat up to 90-95℃ within 40-60 minutes, keep the temperature for 60 minutes;
[0042] c. Add 1 / 2 of the amount of NaOH lye in one step, 90-95℃, keep the temperature for 30 minutes;
[0043] d. After the heat preservation is completed, the temperature is lowered to 80°C, the pH value is adjusted to 4.5-5.5 with formic acid, and the vacuum dehydration is performed. The dehydration amount is 70% of th...
Example Embodiment
[0049] Embodiment 3: A method for producing hot core box resin for casting, characterized in that the weight percentage of raw materials is: aqueous formaldehyde solution: 65%, urea: 8%, phenol: 26%, furfuryl alcohol: 39%, Modifier: 6%, enhancer 0.8%
[0050] The method includes the following steps:
[0051] a. Heat the above amount of phenol to melt and dissolve, add it to the reactor, start the mixer, add the above amount of formaldehyde aqueous solution and furfuryl alcohol in sequence, and use NaOH lye to adjust the pH of the feed solution to 9-10;
[0052] b. Open the steam valve, heat up to 90-95℃ within 40-60 minutes, keep the temperature for 60 minutes;
[0053] c. Add 1 / 2 of the amount of NaOH lye in one step, 90-95℃, keep the temperature for 30 minutes;
[0054] d. After the heat preservation is completed, the temperature is lowered to 80°C, the pH value is adjusted to 4.5-5.5 with formic acid, and the vacuum dehydration is performed. The dehydration amount is 70% of the weig...
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