METHOD FOR PREPARING LIGNIN-MODIFIED FURAN RESIN

摘要

Disclosed are a method for preparing lignin-modified furan resin and the lignin-modified furan resin prepared by using the method. The method of the present invention comprises: step 1, adding formaldehyde into a reaction vessel, adjusting the PH to be alkaline, adding lignin, and reacting under the action of stirring; step 2, adding carbamide for reaction; step 3, adding furfuryl alcohol, reacting under an alkaline condition, and adjusting the PH to be acid for reaction; and step 4, adding carbamide for reaction, dewatering a system under the condition of vacuum, adding furfuryl alcohol into the dewatered system, and stirring the system to be uniform to obtain the lignin-modified furan resin. The furan resin prepared by using the method of the present invention is low in content of free furfuryl alcohol and free formaldehyde, and the emission of formaldehyde in the casting and mulling process can be effectively reduced, so that requirements on environmentally-friendly furan resin are met.