Investigations on the effect of carriers on meta-aramid fabric dyeing properties in supercritical carbon dioxide

Abstract

Ecofriendly dyeing of meta-aramid was investigated with nontoxic carriers in supercritical carbon dioxide.

Surface modification of an aramid fiber via grafting epichlorohydrin assisted by supercritical CO2

“…However, there are a few active groups on the AF surface and the amide functional group forms a p-conjugation effect on the adjacent benzene ring in the molecular chains. 4 At the same time, the ber possesses a smooth surface due to the high crystallinity and degree of orientation, 5 which all result in a poor interface combination between the ber and the matrix, especially the epoxy resin, seriously affecting the long-term and stable service of the composite materials. 6 In other words, the destruction of the AF-reinforced composite products during the service process is mainly attributed to the weak combination between the ber and the matrix.…”

Near room temperature dyeing of m‐aramid fabrics

“…Furthermore, removal of carriers from inside the fibers is difficult. Extensive research has been conducted to overcome such drawbacks including the application of liquid ammonia, a pretreatment with amine solutions, supercritical carbon dioxide, and even surface modification with different techniques has been practiced, for example, diblock copolymer, UV light combined with ozone, and photografting . Such studies have obtained excellent results in improving dyeability of meta‐aramid fibers; however, another hurdle remains when applying those techniques.…”

Inspection for supercritical CO2 dyeing of poly(m-phenylene isophthalamide) by kinetics and thermodynamics analysis

“…11 Nevertheless, the carriers currently used always present high toxicity and bad smell, bringing in great inconvenience to the commercial Inspection for supercritical CO 2 dyeing of poly(m-phenylene isophthalamide) by kinetics and thermodynamics analysis production. 13 Furthermore, a huge amount of wastewater generated from the water dyeing procedure exacerbates concerns as high concentrations of unused dyes, surfactants, and other chemicals are contained. 14 Recently, supercritical carbon dioxide dyeing and finishing has already been investigated worldwide due to the distinct advantages of no water and recyclability of dyes, auxiliaries, and carbon dioxide.…”