Resinification of Factory-Sawdust in Phenol and Optimum Resinification Processing Parameters

Abstract

In order to make full use of wood residues, in this study, we aimed to synthesize resol phenol-formaldehyde resin from liquefied factory-sawdust in phenol in which phenol is 5 times to factory-sawdust in presence of sulfuric acid as catalyst. By using the orthogonal experiment method, the molar ratio of formaldehyde to liquefied factory-sawdust in phenol (LSP) [n (F):n (LSP)], the molar ratio of sodium hydroxide to liquefied factory-sawdust in phenol [n (NaOH) : n (LSP)], the resinification temperature and the resinification time on chemical properties of liquefied sawdust resins (LSR) were investigated. The results show that the ratio of sodium hydroxide to liquefied factory-sawdust in phenol plays the most important role in the processing of resinification, the ratio of formaldehyde to liquefied factory-sawdust in phenol follows, the resinification time and the resinification temperature come to the last two. The optimum processing conditions are as follows: [n (NaOH) : n (LSP)]=0.5, [n (F) : n (LSP)]=2.0, resinification temperature is 80 °C and resinification time is 3.0h. The physical properties of the poplar three-layer plywood bonded with LSR were similar to those with normal PF resins and also satisfied the demands of I level.