Effect of carboxyl methyl cellulose on the adhesion properties of sodium silicate wood adhesive

Carboxyl methyl cellulose (CMC) was used to improve the bonding capacity of sodium silicate (Na₂SiO₃) wood adhesive in this study. Compared with Na₂SiO₃ wood adhesive without CMC, the bonding strength of Na₂SiO₃ wood adhesive with 7.5% CMC increased by 56.3% in dry state, while its water resistance did not improve. The improved performance of CMC/Na₂SiO₃ wood adhesive was supported by its strengthened molecular structure, enhanced thermal stability, beneficial changes in flexibility of Na₂SiO₃ wood adhesive from the analysis results using Fourier transform infrared spectroscopy, thermogravimetric analyzer, and scanning electron microscopy. The improvement effect of CMC on the structure and properties of the adhesive indicates that CMC can be used to prepare environmentally friendly Na₂SiO₃ wood adhesive with high performance.