The invention relates to a production technology of
furan resin, in particular to a production technology of
furan resin used for
casting steel. The technology comprises the following steps of: closing an outlet valve at the bottom of the reactor, opening a feed valve, starting a mixer, adding certain content of
paraformaldehyde,
urea and
furfuryl alcohol, adding certain content of basic catalyst to adjust the PH value of the
seasoning liquid; heating up to 80-100 DEG C, insulating for 60-80 minutes; stopping the insulation, opening cooling water and
cooling down to 60-90 DEG C, adding 50% of the total amount of
furfuryl alcohol; adding certain amount of acid catalyst to adjust the PH value of the
seasoning liquid to 3-5 when the temperature drops to 60 DEG C; heating up to 85-100 DEG C, insulating for 50-70 minutes; adding the 25% of the total amount of
furfuryl alcohol, adding certain amount of
silane coupling agent
ammonia and
methanol; and continuing to stir for 30 minutes after discharging and submitting for censorship. The invention provides a method of using imported
paraformaldehyde and
urea to produce
urea-
formaldehyde glue on the basis of traditional resin technology instead of using
aqueous solution of
formaldehyde. The production technology provided by the invention has the advantages of needlessness of
dehydration in the post-synthetic phase,
production cycle reducing, cost saving and
environmental protection.