Use of additives to enhance the properties of cottonseed protein as wood adhesives

Published Date
July 2016, Vol.68:156–160, doi:10.1016/j.ijadhadh.2016.02.012

Title 
Use of additives to enhance the properties of cottonseed protein as wood adhesives

Author 

H.N. Cheng ^,

Catrina Ford

Michael K. Dowd

Zhongqi He

• Southern Regional Research Center, USDA Agricultural Research Service, 1100 Robert E. Lee Blvd., New Orleans, LA 70124, USA

Accepted 25 February 2016. Available online 4 March 2016.

Abstract

Soy protein is currently being used commercially as a “green” wood adhesive. Previous work in this laboratory has shown that cottonseed protein isolate, tested on maple wood veneer, produced higher adhesive strength and hot water resistance relative to soy protein. In the present study, cottonseed protein and soy protein isolates were tested on different wood types, and cottonseed protein again showed better performance relative to soy protein. Furthermore, the effects of several protein modifiers were evaluated, including amino acids, fatty acids, and other organic molecules with cationic or anionic charges. Aspartic acid, glutamic acid, acetic acid, butyric acid, and adipic acid gave improved performance when included with cottonseed protein isolate whereas no significant effect was observed on soy protein isolate. Both dry adhesive strength and hot water resistance were tested. The enhanced performance observed with these additives provides an additional incentive for the use of cottonseed protein in this application.

Keywords

• Cottonseed protein
• Soy protein
• Adhesion
• Wood veneer
• Protein modifiers

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