Modification of phenol formaldehyde resin adhesive using bagasse lignin

The lignin-based phenol formaldehyde (LPF) adhesive with strong adhesiveness has been prepared for partially replacing poisonous phenol and formaldehyde using bagasse lignin. The preparation conditions of lignin phenol formaldehyde (LPF) adhesive, such as the lignin content, molar ratio of formaldehyde to phenol, catalyst usage, reaction temperatures and times were studied on adhesive strength, shear strength, nonvolatile solids and free formaldehyde contents. The preparation process parameters were also optimized.The performances of the LPF adhesive prepared on the optimized parameters were compared with those of the traditional phenol formaldehyde (PF) adhesive. It was found that up to 50% of phenol can be substituted by lignin to give LPF adhesive having better performances in comparison to PF adhesive. A shelf-life study shows that the adhesive strength of LPF adhesive has higher behavior as compared to PF adhesive.