Abstract
Biobased raw material like lignin used during manufacturing of wood and wood composite adhesive have been used extensively to replaced petro-chemical based adhesive because of their easy availability, low cost and biodegradability. Bio-based resources, such as lignin which is an abundant, constitute a rich source of hydroxyl functionality which is being considered as reactive raw material for the production of “adhesives”. Lignin is mainly used for production of wood and wood composite adhesives by blending with soy protein, grafting with another polymer and reacting with isocynates. In this review, lignin as suitable alternative raw material to conventional petroleum sourced materials used as a raw material for adhesives is discussed.
Highlights
Most polymeric coatings and adhesives are generally based on fossil feedstocks
Biobased raw material like lignin used during manufacturing of wood and wood composite adhesive have been used extensively to replaced petro-chemical based adhesive because of their easy availability, low cost and biodegradability
Comparing to PDL amine, the amine based on not de-polymerized lignin could more greatly enhance the adhesion strength and water resistance of soy protein based adhesives reaction is shown in Figure 1 [12]-[18]
Summary
Most polymeric coatings and adhesives are generally based on fossil feedstocks. Researchers are increasingly devoting their efforts to the possible use of renewable feedstock as raw materials for the production of monomers and their polymeric coatings and adhesives. There has been a more research interest in the development of biobased wood adhesives from renewable resources. Various biomass resources such as lignin, starch, plant proteins, tannin, bark, and vegetable oils have been used as a renewable feedstock to synthesize bio-based adhesives [2]. Lignin is an amorphous natural polymeric material that is based on phenylpropane derivate and one of the most abundant materials and renewable resources on earth. Lignin acts as a reactive component, and the active functional groups in lignin are further utilized for biocompatible materials [6]
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