Abstract
Synthetic resin adhesives such as formaldehyde-based resins have been used for manufacturing wood-based materials. However, in view of concern about global environmental problems and potential shortages of fossil resources, it is desirable to reduce the consumption of synthetic resin adhesives. Natural adhesives derived from bio-resources have been considered as alternatives to synthetic resin adhesives. Natural adhesives for wood are classified into saccharide-based, protein-based, aromatics-based, oil-based, natural rubber-based, and liquefied wood based-adhesives, etc. Several adhesives have been investigated in each group. Recent trends of natural wood adhesives are reviewed based on published research papers. Here I would like to summarize the kinds of natural substances, research methods, synthesis methods, resin properties, bond performance and evaluation methods.
