Comparative Study of Bond Strength of Formaldehyde and Soya based Adhesive in Wood Fibre Plywood

This study proposes a natural biobased adhesive that was developed using soya flour, phenol, Plaster of Paris and an agro-based powder as the binder. A comparison of modulus of rupture of the plywood developed using the proposed soya-based adhesive with popular plywoods, including the traditional urea-formaldehyde based plywood has also been undertaken. The three-point bend test (to identify the modulus of rupture) was conducted for all the plywoods compressed at a fixed pressure. It was observed that the soya-based adhesive imparts greater strength to the plywood than the formaldehyde-based adhesive. It is also desirable for wood and wood-based composites to have fire-retarding and microbial-resistant properties by utilising non- toxic additives and treatments. Traditional methods of achieving these objectives have been harmful; for example, timber has been treated with arsenic-based chemicals to make it resistant to microbes. This paper also presents future research directions to render wood-based composites free of toxic additives as well as being sustainable and environmentally friendly.
Source: Procedia Materials Science - Category: Materials Science Source Type: research