Abstract
To overcome the defects of longer curing times and higher curing temperatures for melamine urea formaldehyde resins (MUF) used in wood panel products, nanofluid MUF resin adhesives were prepared by dispersing SiO2 and TiO2 nanoparticles into the MUF resin at six concentration levels based on the overall mass of the adhesive, 0%, 0.2%, 0.4%, 0.6%, 0.8% and 1%, with the assistance of ultrasound. The excellent thermal conductivities of the nanofluid adhesives eliminated the defects of the MUF resins. When the SiO2 and TiO2 nanoparticles were incorporated, the viscosity increased as the nanoparticle concentration increased, the maximum viscosity increased by 13.4% with SiO2 nanoparticles (1.0% level) and 11.4% with TiO2 nanoparticles (1.0% level), the pot life, curing time, and free formaldehyde content of the MUF resins declined to varying degrees as the nanoparticle loading level was increased, the pot life maximum decreased by 38.5% with SiO2 nanoparticles (0.2% level) and 36.0% with TiO2 nanoparticles (0.2% level), the maximum reduction in curing time was 13.3% with SiO2 nanoparticles (0.4% level) and 13.6% with TiO2 nanoparticles (0.6% level), and the maximum content of free formaldehyde was reduced by 32.3% with SiO2 nanoparticles (1.0% level) and 41.9% with TiO2 nanoparticles (1.0% level). The nanofluid MUF resins showed much higher bonding strengths and lower formaldehyde emissions than pure MUF resins after being treated with the same hot pressing method used during plywood manufacturing. The maximum bonding strength was increased by 28.8% with the SiO2 nanoparticles (1.0% level) and 25.4% with the TiO2 nanoparticles (1.0% level) at a hot-pressing temperature of 100 °C and a hot-pressing time of 60 s/mm. The maximum formaldehyde emissions were reduced by 46.3% with the SiO2 nanoparticles (1.0% level) and 46.3% with the TiO2 nanoparticles (1.0% level) at a hot-pressing temperature of 110 °C and a hot-pressing time of 40 s/mm. Furthermore, nanofluid MUF resins used in plywood manufacturing decreased the hot-pressing temperature or shortened the hot-pressing time required.
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This research was supported by the National Natural Science Foundation of China (Grant No. 32071697)
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ZW: data curation, formal analyses. XK: resources, methodology. BJ: investigation. SX: validation. SH: conceptualization, writing—original draft, funding acquisition.
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Wei, Z., Kong, X., Jia, B. et al. MUF resin incorporating SiO2 and TiO2 nanoparticles: characterization and performance as a plywood adhesive. Eur. J. Wood Prod. 82, 797–808 (2024). https://doi.org/10.1007/s00107-023-02022-6
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DOI: https://doi.org/10.1007/s00107-023-02022-6