Acetylated wood processing method

Abstract

The invention discloses an acetylated wood processing method including the steps: mixing and stirring wood and an acetylation fluid according to the mass ratio of (1-20):100 at the temperature of 10 DEG C-120 DEG C for 50-300 min, to obtain a microwave hydrothermal reaction precursor; putting the obtained precursor in a reaction kettle with a polytetrafluoroethylene liner, then putting the reaction kettle in a microwave hydrothermal reaction instrument, and carrying out an acetylation reaction; after the acetylation reaction is completed, cooling to room temperature, taking out a solid in the reaction kettle, putting the solid in a vacuum drying oven, drying, and thus obtaining an acetylated wood solid. The acetylated wood processing method at least has the following advantages: the method is simple in device, the reaction time is only about 30 minutes while the reaction time of a conventional liquid acetylation method is at least 4 hours or more, the acetylated wood is synthesized at the temperature of 150 DEG C and the pressure of 1 MPa, and the method is a simple-process, high-efficiency, low-energy-consumption and low-cost environmentally-friendly type processing method.

Description

technical field [0001] The invention belongs to the technical field of wood production, in particular to a treatment method for acetylated wood. Background technique [0002] Acetylated wood is a kind of chemically modified wood. Through acetylation modification technology, the wood is chemically modified to convert the hydroxyl groups in the wood components into acetyl groups. This chemical modification thus has the effect of converting hydrophilic hydroxyl groups into hydrophobic acetyl groups. [0003] Wood acetylation is the most studied chemical modification of wood and has begun to be commercialized. Wood acetylation is a technique in which wood is treated with acetyl to improve its dimensional stability. In the early wood acetylation process, acetic anhydride was dissolved in diluents such as xylene and toluene to facilitate penetration in the wood, and long-term high-temperature medium treatment degraded the wood, resulting in a decrease in the strength of the wood...

AI Technical Summary

Problems solved by technology

In the early wood acetylation process, acetic anhydride was dissolved in diluents such as xylene and toluene to facilitate penetration in the wood, and long-term high-temperature medium treatment degraded the wood, resulting in a decrease in the strength of the wood itself ( KumarS, AgarwalSC.Biologicaldegradationresistanceofwoodacetylatedwiththioacetic acid, InternationalResearchGrouponwoodPreservationIRG / WP / 3223, 1983); It is also reported that some catalysts (such as pyridine, etc.) are used in the process of wood acetylation, but the unpleasant smell is difficult to completely remove after the reaction. The separation and recovery of the treatment liquid bring difficulties (RowellRM. Liu Zhengtian and other translations. Solid wood chemistry. Beijing: China Forestry Press, 1988: 10-28); Wang Wanhua etc. measure the waste liquid after liquid phase acetylation and draw about 85% of the acid anhydride does not actually participate in the reaction, which is a great waste in industry (Wang Wanhua et al. Research on liquid phase acetylation of wood. Journal of Nanjing Forestry Industry College. 1981(4): 33-40)

It can be said that the high cost of acetylated wood due to low acetylation yield is a difficult problem in acetylation research.