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Modifying wood with paraffin wax emulsion impregnation and thermal modification: hydrophobization effect and mechanism of the combined treatment
2016 - IRG/WP 16-40726
The aim of this study was to enhance the water repellency of wood by a combined treatment of paraffin wax emulsion (PWE) impregnation and thermal modification. Two different treating procedures were used to modify the southern pine (pinus spp.). One is first PWE impregnation and then thermal modification, another is first thermal modification and then PWE impregnation. The treated samples were immersed in distilled water, and the water absorption property was tested by gravimetric method and time-domain nuclear magnetic resonance (TD-NMR). The results indicated that the combined treatment showed much better performance than the single treatment, especially the process of first PWE impregnation and then thermal modification. Moreover, the synergism between two procedures were also observed by TD-NMR and scanning electron microscope (SEM). It could be concluded that the PWE impregnation and thermal modification increase the hydrophobicity of wood through decreasing free water absorption and bound water absorption respectively. And the synergistic effect of the combined treatment was mainly due to the redistribution of the paraffin wax during the thermal modification.
Wang Wang, Jinzhen Cao, Cong Chen
Wood Hydrophobic Modification by Mixed Wax Emulsions
2018 - IRG/WP 18-40839
An environmental-friendly, economical and facile method to construct hydrophobic system for improving wood repellency was applied in this study. Using paraffin wax and carnauba mixed wax O/W emulsions can simultaneously fabricate continuous wax films and rough structures in wood internal and external surface under appropriate heat treatment. In the study, single and mixed wax emulsions of 4% solid content were prepared for wood impregnation with subsequent heat treatment at 70oC. The water absorption, dimensional stability and contact angle of treated wood were determined, and the micromorphology of double-layer model was presented by Field Emission Scanning Electron Microscope (FE-SEM). Furthermore, the water distribution and water state were analyzed by Low Field Nuclear Magnetic Resonance (LF-NMR). The results indicate that micron-submicron rough structure and water-proof wax film could be both observed after demulsification and redistribution of mixed wax emulsions, which rendered wood hydrophobicity and long term water repellency.
C Chen, W Wang