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Polymers 2017, 9(5), 169;

Soy-Based Adhesive Cross-Linked by Phenol-Formaldehyde-Glutaraldehyde

1,* and 1,*
Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China
College of Forestry, Guizhou University, Guiyang 550025, Guizhou, China
The two authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Academic Editor: Antonio Pizzi
Received: 10 March 2017 / Revised: 2 May 2017 / Accepted: 5 May 2017 / Published: 8 May 2017
(This article belongs to the Collection Polymeric Adhesives)
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To prepare a low-formaldehyde soy-based adhesive with good water resistance, phenol-formaldehyde modified with glutaraldehyde (PFG) with lower free phenol and free formaldehyde contents was used to cross-link the soy-based adhesive. The results showed that the mechanical properties and water resistance of plywood prepared with soy-based adhesive with PFG was better than that of plywood with the same amount of phenol-formaldehyde (PF). The reaction between phenol and glutaraldehyde was proved by 13C-NMR. Under the optimized preparation conditions for plywood, that is to say, press temperature 160 °C, press time 4 min and resin loading 320 g·m−2, type I plywood could be prepared with 9% PFG as a cross-linker of soy-based adhesive. The Differential Scanning Calorimetry (DSC) result confirmed the cross-linking reaction between soy-based adhesive and PFG or PF. The activation energy of soy-based adhesive with cross-linker PFG was higher than that with PF resin. View Full-Text
Keywords: soy-based adhesive; glutaraldehyde; phenol-formaldehyde; preparation procedure; crosslinking modification soy-based adhesive; glutaraldehyde; phenol-formaldehyde; preparation procedure; crosslinking modification

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Wu, Z.; Xi, X.; Lei, H.; Du, G. Soy-Based Adhesive Cross-Linked by Phenol-Formaldehyde-Glutaraldehyde. Polymers 2017, 9, 169.

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