Process for fabricating low nitrogen furan resin for steel casting
A production process and nitrogen furan technology are applied in the field of production technology of low nitrogen furan resin for cast steel, which can solve the problems of pores, pinholes, short use time of resin and high free formaldehyde content, and achieve the effect of improving strength
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[0060] A kind of manufacture technology of low-nitrogen furan resin for cast steel, it is characterized in that: it comprises the following steps: optimal formula: formaldehyde (36.5%): 8-9 parts of urea: 3-5 parts of furfuryl alcohol: ≥85 parts of NaOH solution: 40% hydrochloric acid solution: 10% silane coupling agent: 0.2%
[0061] a. Feeding: Use a vacuum pump to suck the formaldehyde solution into the metering tank, close the discharge valve at the bottom of the reaction kettle, open the formaldehyde feed valve, add formaldehyde from the process formula, open the steam valve, start the mixer, add a certain amount of NaOH to adjust the pH of the solution To 7.5 ~ 8.5, then slowly add 92.6% of urea in the process formula, close the feed valve;
[0062] b. Heating and heating: when the temperature of the feed liquid rises to 35-45°C, use NaOH solution to adjust the pH value of the reaction solution to 8.7-9, open the reflux valve, and slowly raise the temperature for 60 minu...
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