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Title: Influence of soy type on wood bonding performance

Author: Frihart, Charles R.;

Date: 2011

Source: Proceedings of the 34th annual meeting of the Adhesion Society, 2011 February 13-16, Savannah, GA. Blacksburg, VA: The Adhesion Society, 2011: [3] p.

Publication Series: Paper (invited, offered, keynote)

Description: Proteins were the main wood bonding adhesives for centuries, but they were displaced by fossil fuel-based adhesives in the 20th century because synthetic adhesives offered better water resistance, ease of use, and lower cost. Recently, studies using a polyamidoamine– epichlorohydrin (PAE) curing agent have led to soybean-based adhesives that are being used commercially for interior plywood, engineered wood flooring, and particleboard. Commercial products typically use the less expensive soy flour, while the majority of the published research has been on the soy protein isolate and purified glycinin and conglycinin proteins. Although soy flour contains about equal proportions of carbohydrate and protein, the common assumption is that the protein provides most of the adhesive strength. Thus, to make better products, it is important to understand protein structure and how other components in natural products are altering the performance of these adhesives. For proteins, intrachain interactions are more critical than they are for other polymers. The hydrophobic folding of the proteins may also limit the number of available reactive groups accessible for cross-linking reactions. To better assess the influence of various parameters, we have studied the effect of heat denaturation on soy flour and compared the performance on wood-bond strength of soy flour to the more purified concentrate and isolate versions.

Keywords: Soybean glue, adhesives, adhesion, soy flour, soy proteins, proteins, glue, viscosity, water repellents, carbohydrates, epichlorohydrin, gluing, thermal analysis, wood, durability, bonding, performance testing, bond strength, polyamidoamine, polymers, polymerization, thermal degradation

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  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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Frihart, Charles R. 2011. Influence of soy type on wood bonding performance. In: Proceedings of the 34th annual meeting of the Adhesion Society, 2011 February 13-16, Savannah, GA. Blacksburg, VA : The Adhesion Society, 2011: [3] p.

 


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