METHOD FOR PRODUCTION OF PHENOL-FURAN BINDER Russian patent published in 1997 - IPC

FIELD: manufacturing of abrasive tools having flexible base. SUBSTANCE: phenol alcohol is condensed in the presence of maleic anhydride to viscosity 50-130 s. Thus prepared resin is isolated, stabilizing agent is added and then vacuum drying is carried out. Diethylene glycol is used as mentioned above stabilizing agent. The process is followed by adding of furfural and reaction is carried out within 40-80 min at 50-80 C. Mass ratio of phenol alcohol, maleic anhydride, diethylene glycol and furfural is 100:(3-4):(8-10): (30-55) respectively. Then abrasive composition on the base of thus obtained binder is prepared. Said composition is applied of cloth being preliminary dressed, then abrasive grains being applied on it. EFFECT: decreases losses of furan raw materials, intensifies the process. 2 tbl