Improving single-step scCO2 dyeing of wood by DMSO-induced micro-swelling

被引：10

作者：

Jaxel, J. ^{[1
,2
]}

Gusenbauer, C. ^{[3
]}

Boehmdorfer, S. ^{[2
]}

Liebner, F. ^{[2
,4
,5
]}

Hansmann, C. ^{[1
]}

机构：

[1] Kompetenzzentrum Holz GmbH, Wood K Plus Competence Ctr Wood Composites & Wood, Altenberger Str 69, A-4040 Linz, Austria

[2] Univ Nat Resources & Life Sci, Inst Chem Renewable Resources, Dept Chem, Vienna BOKU, Konrad Lorenz Str 24, A-3430 Tulin An Der Donau, Austria

[3] Univ Nat Resources & Life Sci, Inst Wood Technol & Renewable Mat, Dept Mat Sci & Proc Engn, Vienna BOKU, Konrad Lorenz Str 24, A-3430 Tulin An Der Donau, Austria

[4] Univ Aveiro, Dept Chem, Campus Univ Santiago, P-3810193 Aveiro, Portugal

[5] Univ Aveiro, CICECO Aveiro Inst Mat, Campus Univ Santiago, P-3810193 Aveiro, Portugal

来源：

JOURNAL OF SUPERCRITICAL FLUIDS | 2020年 / 165卷

基金：

欧洲研究理事会;

关键词：

Supercritical carbon dioxide dyeing; Wood modification; Dimethyl sulfoxide; 5,8-dihydroxy-[1,4]-naphthoquinone; Naphthazarin; Wood swelling; SUPERCRITICAL-FLUID IMPREGNATION; REACTIVE DISPERSE DYES; INTERNAL-PRESSURE DEVELOPMENT; CELLULOSIC KEY CHROMOPHORE; CARBON-DIOXIDE; COTTON; FIBERS; CO2; ACETYLATION; BIOCIDES;

D O I：

10.1016/j.supflu.2020.104978

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Supercritical dyeing of wood is a smart green technology. Beyond being of interest to wood industry, it could help to preserve tropical forests and decrease the environmental pollution from overseas shipping. However, scCO(2) dyeing is still in its infancies. This paper demonstrates at the example of three major European hardwood species and the dye Naphthazarin that the uptake of colorants can be improved if scCO(2) is complemented with small amounts of DMSO. The latter triggers micro-swelling of wood, thereby improving dye penetration. Systematic variation of process parameters revealed that optimal colouration is reached at 20.0 MPa and 85 degrees C. Colour gradients as observed in the interior of halved specimen were evaluated by two methods. While the Euclidean distance Delta E (CIELAB) represents relative colour change only, a recently proposed scanning densitometric approach translates colour depth into absolute dye surface concentration. Morphological investigations conceal this study investigating the impact of selected process conditions. (C) 2020 The Authors. Published by Elsevier B.V.

引用

页数：11