Evaluation of ultrasonic-assisted dyeing properties of fast-growing poplar wood treated by reactive dye based on grey system theory analysis

Abstract

Ultrasonic-assisted dyeing as a novel and eco-friendly method was utilized to improve decorative value of fast-growing tree species. The effects of ultrasonic-assisted dyeing parameters (e.g., temperature, dye concentration, ultrasonic power, dipping time, dyeing assistant and dye-fixing agent) on the properties of wood were investigated, and the parameters were optimized. Moreover, the main factors mentioned above were determined with grey system theory analysis. Analyses of chemical structure, thermostability, crystallinity, and microscopic morphologies were conducted using fourier transform infrared spectroscopy (FTIR), thermogravimetric (TG), X-ray diffraction (XRD), and scanning electron microscope (SEM), respectively. Results showed that dye uptake and K/S were influenced by the parameters in the following order: dye concentration > dye-fixing agent > dyeing assistant > dipping time > ultrasonic power > temperature. FTIR indicated that an ether bond was formed between the wood component and the reactive dye. TG and XRD demonstrated that the thermal stability and crystallinity of ultrasonic-assisted dyed wood were both improved. SEM revealed that dye molecules diffused into the cell cavity, wood vessel, aperture, and part of the wood microstructure such as pit membrane, which was mechanically damaged after the ultrasonic-assisted dyeing treatment and created new fluid channels for the dye.

Natural dye extracted from Dalbergia cochinchinensis residue with water fastness, mildew resistance and permeability properties for wood staining

“…Moreover, distribution form variation between dye and wood tissues may also account for this phenomenon. As reported in our previous study (Zhu et al, 2018), the ND was formed a lm that anchored on the wood tissues leading to greater coverage area, which was quite different from spots distribution form for acid and reactive dye (Liu et al, 2015b;Wang et al, 2018b). Additionally, the AGR and R3G offer more propensity for water dissolution problems and further result in poor water fastness property.…”

Enhancing flame retardancy, thermal stability, and superhydrophobic of paper through Na₂O·nSiO₂ and PDMS modification

“…In the second stage, spanning from 120℃ to 280℃, the paper entered its glass transition temperature stage. The mass loss rate during this phase was ~ 18%, primarily owing to the instability of components within the paper and the pyrolysis of hemicellulose (Wang et al 2018). As the temperature increased, the third stage of the thermal decomposition process of the paper unfolded between 280°C and 380°C, constituting the charring stage.…”

A közönséges gyertyán (Carpinus betulus L.) jelenlegi helyzete és potenciálja az erdészetben és faiparban

“…A faipar számára számos innovatív elképzelés létezik a fenti kihívásokra lehetséges válaszként: − fenyő helyettesítése bükkel, nyírrel, gyorsan növő nemesnyárral, fűzfával (van Acker 2021); − lombos faanyagból CLT-t előállítani, pl. bükkből, nyárfából, nyírfából (Wang et al 2018;Brunetti et al 2020;Dubois et al 2020); − kőrisből, nyírfából, tölgyből, bükkből, nyárból rétegelt ragasztott tartót készíteni (Luedtke et al 2015); − LVL bükkből, nyárfából (Knorz and van de Kuilen 2012;Wei et al 2019); − kombinált rétegelt ragasztott tartó gyártása -külső réteg lombosfából, belső réteg fenyőből (Balász et al 2020); − módosított faanyag használata rétegelt ragasztott tartók, rétegelt lemez, OSB (irányított szálforgács lap), LSL, LVL gyártásához a tartósság és a méretstabilitás növelése érdekében (Mirzaei et al 2017;Barnes et al 2018); − ragasztómentes technológiák használata (van Acker 2021). A mérnöki fatermékek hozzájárulnak a fával történő építés fő előnyeihez: gyors (rövid építési idő), könnyű (nagyon jó szilárdság/merevség arány), zöld (fenntartható, bioenergia).…”