Research Progress of Wood Low Molecular Weight Resin Impregnation Modification and Its Drying

Resin modification is one of the enhancement treatments by filling wood cell lumina and cell wall with low molecular weight thermosetting resin, which could form a stiff network with themselves to increase wood density as well as strength properties, and by bulking the cell wall, blocking hydroxyl group or reducing water sorption sites to improve dimensional properties of wood. For this reason, modified wood, especially for fast-growing wood with low density and poor dimensional stability, with resin impregnation would promote its added value and widen its end-use. There are two steps involved in making resin modified wood, the resin impregnation treatment and the drying of impregnated wood. With the development of wood resin modification, drying, as a key technical of resin-modified wood preparation and industrial application, has been paid more and more attention by researchers. This paper reviewed both research progress on them, respectively. Specifically, the main internal and external factors on wood resin modification, and the new technology of resin modification were systematically introduced and described. After that, the influence of different drying technology on the drying characteristics of resin impregnated wood, the moisture transfer and resin curing characteristics during the drying process were introduced emphatically. Finally, the main problems and the research work of the future in this field was proposed. © 2022, Materials Review Magazine. All right reserved.