posted on 2024-03-01, 13:41authored byJunfang Xue, Zhenxuan Liang, Qian Yan, Shifeng Zhang, Haijiao Kang
The wood industry faces challenges in producing eco-friendly,
high-performance,
and formaldehyde-free adhesives. In this study, carboxylated styrene–butadiene
rubber (XSBR) was blended with polyamidoamine–epichlorohydrin
(PAE) resin, and a controlled amount of CaCO3 powder was
incorporated to create an adhesive with exceptional strength. The
resulting three-layer plywood demonstrated remarkable dry and wet
shear strengths of 3.09 and 2.36 MPa, respectively, and of 2.27 MPa
after boiling water tests, comparable to that of phenolic resins.
Additionally, the adhesive exhibited strong adhesion across various
materials including glass, metal, etc. This exceptional performance
was due to two primary factors: (1) the high-density chemical cross-linking
reaction and the physical entanglement between XSBR and PAE; (2) the
organic–inorganic hybrid involving metal ion complexation developed
by CaCO3, which fostered molecular chain connections and
enhanced the adhesive–material interface. These findings offer
valuable references for further research in the field of wood adhesives.