Pigment dyeing of polyamide‐epichlorohydrin cationized cotton fabrics

Abstract

A synthesized cationic reagent named polyamide-epichlorohydrin (PAE) was used to cationize cotton fabrics which were dyed with nanoscale pigments after PAE modification. The results showed that when the PAE concentration was below 7% (owf), the K/S value increased nearly linearly with increasing of PAE concentration, and excess that concentration the K/S value did not increase further. With increasing the pH value of cationization bath, the K/S value increased first and then decreased, the maximum K/S value appeared at pH 9-10. Cotton fabrics cationized at 80 C for 20 min exhibited the best cationizing result. Both the pigment uptake and the color strength reached their own maximum values when the dye bath was neutral. When the pigment concentration was 1% (owf) the addition of 1g/L sodium chloride in the dye bath could decrease the pigment uptake while for 5% (owf) pigment concentration the uptake increased with increasing the amount of sodium chloride.

Modification of carbon black pigment: Cotton fabric colouring and anti‐bacterial finishing

“…However, because cotton fibres usually possess a negative charge during the colouring process, anionic CB pigments cannot be used directly on cotton fabric unless the cotton fabric is first modified to possess cationic properties. [12][13][14] One type of hydrophilic group that has always been beneficial to the improvement of particles' dispersibility in the aqueous phase is the quaternary ammonium group. This compound has mainly been used as a cationic antimicrobial agent to kill and/or prevent the growth of microorganisms on the surface of materials.…”

“…Space‐confined and electrostatic repulsion of the modified agent are primary factors for the improvement of the dispersibility of CB pigments. However, because cotton fibres usually possess a negative charge during the colouring process, anionic CB pigments cannot be used directly on cotton fabric unless the cotton fabric is first modified to possess cationic properties 12‐14 …”

Preparation of reactive nanoscale carbon black dispersion for pad coloration of cotton fabric

“…Common polymeric dispersants are only used for their dispersing and stabilising abilities, but do not take into account fixing performance. Large amounts of binders or crosslinkers are needed in pigment applications to improve colour fastness and poor handle and the colour brilliance of dyeing fabrics due to the poor attractive forces between the pigment and fabric. Binders or crosslinkers impair pigment dispersability, therefore a multifunctional material with the functionality on both dispersant and crosslinker is needed that could reduce the amount of binders and enhance colour fastness of dyeing fabrics.…”

Modelling the properties of pigment‐dyed polyester/cotton sheeting fabrics by response surface methodology

“…Pigment dyeing of polyester/cotton blended fabrics can be a good single‐stage alternative to dyeing with disperse/reactive or disperse/vat dyes. Pigment dyeing is known to give excellent light fastness and good wash fastness, along with controlled fabric pilling . However, in terms of rubbing fastness, fabric tear strength and stiffness, there is still room for improvement in pigment dyeing systems, which is currently the focus of many manufacturers of pigments and auxiliaries .…”