Bio-based adhesives have shown promise in the engineered wood products industry, and there is a substantial growth of research on bio-based bonding agents. Wood is a renewable resource, and most of the engineered wood products are synthetic adhesive-bonded composites and laminates. Environmental concerns exist for the use of adhesives made from fossil fuels lowering the bio-content of the bonded wood products. Bio-based adhesives are getting more attention since they are environmentally friendly green products without any adverse effects on the environment. However, there is a remaining challenge for the industry to make them more effective than synthetic ones in terms of their mechanical properties and long-term durability. These adhesives, with different components such as cellulose, proteins, lignins, and tannins are adhesives which exhibit great potential for the bonding of specially engineered wood products. The modification of bio-based adhesives with different dispersing agents and cross-linkers can improve their strength and water resistance properties to compete with synthetic adhesives. The blending of proteins and carbohydrates can yield good bio-adhesives with acceptable adhesive properties. All these improvements of bio-based adhesives help us move towards ‘sustainable’ products where clean synthesis, biomass and water-based processing are highly desirable. Based on studies conducted in recent decades, the objective of this article is to review the production processes of adhesives from different bio-resources, their necessary modification for improving properties and their utilization in the wood-based industries. Finding the research gaps would also help to hasten the research activities for applying these bio-based adhesives at the industrial scale.

生物基粘合剂在工程木制品行业已显示出前景，并且对生物基粘合剂的研究显着增长。木材是一种可再生资源，大多数工程木制品是合成粘合剂复合材料和层压板。使用由化石燃料制成的粘合剂会降低粘合木制品的生物含量，因此存在环境问题。生物基胶粘剂作为对环境无任何不良影响的环保绿色产品，受到越来越多的关注。然而，要使它们在机械性能和长期耐用性方面比合成材料更有效，该行业仍存在挑战。这些粘合剂含有不同的成分，如纤维素、蛋白质、木质素、和单宁是粘合剂，在特殊工程木制品的粘合方面表现出巨大的潜力。用不同的分散剂和交联剂对生物基粘合剂进行改性，可以提高其强度和耐水性，与合成粘合剂竞争。蛋白质和碳水化合物的混合可以产生具有可接受的粘合特性的良好生物粘合剂。生物基粘合剂的所有这些改进帮助我们转向“可持续”产品，在这些产品中，清洁合成、生物质和水基加工是非常需要的。基于近几十年来进行的研究，本文的目的是回顾来自不同生物资源的粘合剂的生产过程，它们为改善性能而进行的必要修改，以及它们在木质工业中的利用。