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Improving the dyeability of polyimide by pretreatment with alkali
Author(s) -
Wang Zehong,
Rao Zhujun,
Zhan Yizhen,
Hao Tianqi,
Wang Wei,
Yu Dan
Publication year - 2016
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/cote.12238
Subject(s) - polyimide , dyeing , rubbing , materials science , swelling , thermal stability , adsorption , yield (engineering) , disperse dye , chemical engineering , alkali metal , composite material , polymer chemistry , chemistry , organic chemistry , layer (electronics) , engineering
Polyimide fabric, as a high‐performance fabric, possesses advantageous properties, such as outstanding thermal stability and chemical resistance, but has poor dyeability. In this paper, polyimide fabric was dyed successfully with disperse dyes by high‐temperature and high‐pressure dyeing in the presence of a swelling agent and auxiliaries. Under optimal dyeing conditions, it is pretreated with Na OH 6 g l −1 and dyed with disperse dyes 5% o.w.f., NaCl 1 m , benzyl alcohol 60 ml l −1 at 135 °C for 45 min to obtain a satisfactory colour yield with good washing fastness and dry rubbing fastness with 93.3% strength retention. The experimental results demonstrate that the Nernst adsorption isotherm is a favourable model for polyimide fabric dyeing with disperse dyes.