The Synthesis And Bonding Properties Of Biomass Modified Phenol-formaldehyde Resin Adhesives

In order to reduce the production costs and the content of free phenol and formaldehyde of phenol-formaldehyde resin(PF), to improve the performance of PF, the modification of PF was investigated in this survey. Modified PF was synthesized by cheap and abundant cashew oil, starch, residue of the processing of oiltea camellia and other biomass. Modified PF’s structure and its bonding surface were characterized by infrared spectrogram detector, contact angle apparatus, electron microscope and so on. Effect of biomass on the performance of modified PF was discussed in this survey. Firstly, the result showed that when the ratio of formaldehyde and phenol was1.7, cashew oil can replace30%phenol. The bonding strength of cashew oil modified PF, whose viscosity, free formaldehyde content and bonding strength were510mPa.s,0.22%and1.62MPa, is equal to commercial phenol-formaldehyde resin adhesive.Then the PF was modified by cashew oil which partly replaced phenol under the catalyst of maleic anhydride. It proved that the replacement can be50%. As the price of cashew oil is the half of phenol, it has significant economic and ecological benefits. The bonding strength of cashew oil modified phenol-formaldehyde resin adhesive can be improved while the amount of phenol can be reduced with the addition of oxidized starch whose largest amount was10%of the mass of phenolic. The optimum synthesis condition of residue of the processing of oiltea camellia modified phenol-formaldehyde resin(YCJ-PFR) and the relationship between the condition and the bonding strength were analysed in this research. It showed that the addition of residue of the processing of oiltea camellia made no difference to the viscosity and bonding strength of YCJ-PFR when the amount is below30%. The partical size of residue of the processing of oiltea camellia and the molar ratio of phenol and formaldehyde made a big difference to the content of free formaldehyde, bonding strength and storage stability. This study results open new avenues of residue of the processing of oiltea camellia and modified phenol-formaldehyde resin.