Characterization of canola oil based polyurethane wood adhesives

• Published in: International journal of adhesion and adhesives Vol. 31; no. 6; pp. 559 - 564
• Main Authors: Kong, Xiaohua, Liu, Guoguang, Curtis, Jonathan M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.09.2011; Elsevier
• Subjects: Adhesives; Applied sciences; Canola oil; Canola oil based polyurethane; Chemical resistance; Curing; Ethers; Exact sciences and technology; Lap shearing strength; Organic polymers; Physicochemistry of polymers; Polymers with particular properties; Polyols; Polyurethane resins; Preparation, kinetics, thermodynamics, mechanism and catalysts; Shear strength; Wood; Wood adhesive; Curing; Canola oil based polyurethane; Wood adhesive; Chemical resistance; Lap shearing strength; Adhesivity; Wood; Property composition relationship; Mechanical properties; Shear strength; Vegetable oil; Experimental study; Polyaddition; Rapeseed oil; Waterproofness; Preparation; Polyurethane; Crosslinked polymer; Surface properties; Polyol; Chemical properties; Monomer; Adhesive
• ISSN: 0143-7496; 1879-0127
• DOI: 10.1016/j.ijadhadh.2011.05.004

A novel bio-based poly (ether ester) polyol containing both primary and secondary functional groups was synthesized from canola oil using a low cost and efficient procedure. In this work, use of the new canola oil derived polyol for the production of polyurethane (PU) adhesives was demonstrated. The canola oil based PU adhesives had similar or better adhesive properties in terms of lap shear strength than three commercial PU adhesives. The effect of NCO/OH ratio and temperature on adhesive characteristics on wood bonding was also evaluated by lap shear tests. It was found that the use of an elevated curing temperature (i.e. 100 °C), as well as optimized NCO/OH molar ratio (higher than 1.5/1.0), improved the wood adhesive properties. The overall chemical resistance of bio-based PU adhesives to cold water, acid and alkali was comparable to that of commercial PU adhesives whilst its resistance to hot water was superior.