Methyl glucoside as an extender/modifier for phenol-formaldehyde resin used to bond structural plywood

Replacement of 15 percent of the phenol-formaldehyde (PF) resin solids with methyl glucoside (STA-MEG 100) was studied in adhesives used to bond southern pine plywood. In laboratory tests, methyl glucoside-PF resin produced bondline quality comparable to the control PF resin. The stability of the phenolic resin was improved with pre-addition and post-addition of methyl glucoside. Methyl glucoside was also effective in reducing free formaldehyde in a flakeboard resole PF resin. Methyl glucoside was proven to be an effective extender/modifier in adhesive mixes used to bond structural plywood in plywood mills in the southern United States. Up to 15 percent replacement of the PF solids with methyl glucoside was approved by independent testing and certification agencies (i.e., American Plywood Association and Timber Engineering Company) in their subscriber mills. Plywood mills reported that adhesive spreads have been reduced 7 to 12 percent when using methyl glucoside-modified adhesives. The price of methyl glucoside is expected to remain competitive with the cost of PF resin on a solids basis. Due both to the lower adhesive cost and the lower spread application rate when using methyl-glucoside-modified PF adhesives, plywood plants can achieve production cost and performance advantages, and the supply of PF resin can be extended with a renewable resource.

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