Foaming Soy Adhesives May Help Soybeans Bond
With Lumber Industry By
December 29, 2000
A new soy-based glue may give plywood manufacturers what every
industry wants: faster production at a lower cost.
Agricultural Research Service (ARS)
scientists in Peoria, Ill., substituted soy flour for an expensive animal blood
protein now used in plywood glue formulas.
Concerns about animal bloods limited supply and about
health issues prompted the search for alternative protein extenders. Extenders
are substances added to an adhesive to reduce the amount of resin required. The
plywood glues were designed to be applied with foam extrusion, one of four
conventional ways the industry applies glue to wood.
Soy flour--at 22 cents per pound--made the best foaming glue.
That glue was 50 cents per 100 kilograms cheaper than conventional
formulations. Soy flour makes up 3.5 to 5.5 percent of the glue mix, with the
adhesive resin being the primary component. Soy flour has less protein than
animal blood, so it cant be used one-for-one in place of blood protein in
the glue. But by adding more soy flour, the researchers produced a glue that
foamed better at less cost.
Other benefits of the soy-based glue are that it requires less
drying time, uses less water, and produces less waste than conventional plywood
glues. The United Soybean Board provided
funding for this project.
ARS is the chief scientific research agency for the
U.S. Department of Agriculture.
A report on the soy glue appears in the January issue of
Agricultural Research magazine.
Scientific contact: Milagros P. Hojilla-Evangelista,
ARS National Center for Agricultural
Utilization Research, Peoria, Ill., phone (309) 681-6350,