Jump to main content
Jump to site search

Issue 7, 2018
Previous Article Next Article

A lignin-epoxy resin derived from biomass as an alternative to formaldehyde-based wood adhesives

Author affiliations

Abstract

Wood products are extensively used to make furniture items and construction materials; however, the majority contain formaldehyde-based adhesives that raise serious health concerns. Here, we report a formaldehyde-free adhesive formulation comprised of two high-volume biorefinery biproducts, namely Kraft lignin (pulp and paper) and glycerol (biodiesel), and its adhesion properties as determined by ultimate shear stress as well as wood failure rates. We show that this lignin-based resin displays the same desirable characteristics as formaldehyde-based resins including water-tolerance, fast curing, and comparable adhesion performance. Chemical analysis indicates that resin curing occurs uncatalyzed via formation of ether bonds between lignin hydroxyl groups and the glycerol-derived crosslinker epoxide. We also show that different lignin and crosslinker feedstocks can be used in the formulation, in some cases with water as a cosolvent, to generate a set of lignin-derived resins with similar properties and mechanical strength. In contrast to the majority of formaldehyde-free adhesives, this lignin-epoxy formulation does not require the use of caustic base and known carcinogens. Furthermore, we demonstrate through mechanical testing and attention to processing conditions that this lignin-based resin has the potential to be a viable alternative to widely used formaldehyde resins.

Graphical abstract: A lignin-epoxy resin derived from biomass as an alternative to formaldehyde-based wood adhesives

Back to tab navigation

Supplementary files

Publication details

The article was received on 07 Oct 2017, accepted on 21 Feb 2018 and first published on 21 Feb 2018


Article type: Communication
DOI: 10.1039/C7GC03026F
Citation: Green Chem., 2018,20, 1459-1466
  •   Request permissions

    A lignin-epoxy resin derived from biomass as an alternative to formaldehyde-based wood adhesives

    R. J. Li, J. Gutierrez, Y. Chung, C. W. Frank, S. L. Billington and E. S. Sattely, Green Chem., 2018, 20, 1459
    DOI: 10.1039/C7GC03026F

Search articles by author

Spotlight

Advertisements