A novel gelatin-based copolymer derived from chromium shavings waste as
eco-friendly wood adhesive
Abstract
One environmental friendly wood adhesive based on waterborne
polyurethane (WPU) grafted gelatin (G) was investigated in this
research. The G was extracted from chromium shavings waste firstly, and
then mixed with pre-polymer emulsion of WPU to synthesis the graft
copolymer (WPUG) via solvent-free emulsion copolymerization. The
synthesized copolymer was characterized regarding the mechanical
properties test, TGA, FT-IR and other analysis technology. The results
indicated that the WPUG has good stability, water resisting. The
film-forming and thermal stability of G were improved after reacted with
the pre-polymer of WPU, and the temperature of maximum weight loss was
over 350 oC. The WPUG adhesive has excellent bonding power and
mechanical properties, the dry bonding strength could reach 4.21 MPa
when the R value was 1.5. The preparation of copolymer not only can
perfectly satisfy the need of environment-friendly wood adhesives, but
can also effectively improve the recycling use of chromium shavings
waste.