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This study describes the preparation of microemulsion inks based on commercially available disperse dyes for thermal bubble ink jet printing. The approach to make the inks is by formulating to form water-soluble emulsions (o/w), which were then optimized to reach a dynamically stable isotropic condition. The dyes in three primary colors-cyan, magen...
Citations
The study aims to investigate the effect of additives (poly (vinyl pyrrolidone) PVP, glycerol, ethylene glycol) on the performances of disperse water-based inks for ink-jet printing and how such additives interact with water. This should help into design suitable inks for textile printing by ink-jet printing, in particular for synthetic fibers such as polyester fabrics. Thirteen kinds of inks were prepared, and the glycerol content was replaced by water and PVP (K15, K30, K60), and the solubility parameter of the additive was calculated by the group contribution method. Low field nuclear magnetic resonance (LF-NMR) reveals the existence of bound water, intra-microstructure water, and extra-microstructure water in the ink, and the intra-microstructure water is entrapped inside the micro-structure formed by additives, mainly due to the presence of PVP. The optimal ink (Y5K30) has a low linewidth relative change (0.4%) and excellent sharpness. The reason is the existence of microstructure in ink, which reduces the mobility of solvent in ink and the diffusion of ink on fabric. PVP and disperse dyes have a strong affinity and help to improve the color depth and color fastness of the fabric.
Nanosuspension of prodigiosins micelles produced by the fermentation of Serratia marcescens was utilized as a novel kind of cleaner disperse dye for polyester fabric dyeing. The average particle size of the pigments dispersion was 184.3 nm (range of 101.1-378.0 nm). The effects of technical parameters including dyeing temperature, dyeing time and dye bath pH on dyeing effects, antibacterial and ultraviolet protective properties of dyed fabrics were explored. The results indicated that when the dyeing temperature was set at 110 °C with a holding time of 30 minutes, dyed polyester under dye bath pH of 1.9 and 7.9 possessed high color strength, outstanding bacteriostatic rate of above 89.0% against Staphylococcus aureus and very good UV-protection ability. In addition, the dyed fabrics exhibited excellent rubbing, washing and perspiration color fastness but poor light color fastness. This research developed a novel clean method of preparing prodigiosins disperse dye by microbial fermentation and dyed polyester fabric to endow it with functionalities.
C.I. disperse dye blue 60 was encapsulated with poly(styrene-maleic acid) by phase separation method and followed by the preparation of enccpsulated disperse dye dispersion Experimental results showed that sodium hydroxide and ammonia provided the dispersion the smaller particle size as compared with other additives. An optimal process was attained when mass ratio of NaOH to poly(styrene-maleic acid) was about 0.5, mass ratio of SDBS or OP-10 to encapsulated disperse dye was about 15% and dispersed with bead mill or ultrasonic machine. The encapsulated C.I. disperse dye blue 60 dispersion had narrow particle size distribution and excellent stability to centrifugal force, freeze-thaw treatmen. The rheological behavior of the dispersion was close to Newtonian fluid.
In order to anticipate the color of dye ink more accurately, WENZHOU Mernuo Red-10 as an example, who was dissolved in different polarity solvent by magnetic stirring and ultrasonic agitation, the influence for properties of solvent on color of dye was researched with the coating method through contrasting sample papers. The influence for pH values of the solution and adding water to Red-10 solution on color of dye were also researched. It's shown that with the increased polarity of the solution,the absorption wavelength of Red-10 reduced gradually,light shade effect was caused. For the same solvent,with the pH values of the solvent increased,the absorption wavelength of Red-10 reduced gradually,light shade effect was caused.And all the factors affect the L,a,b values of the Red-10 dye's samples.
This research focus on investigating the effect of particle size on properties and droplet formation of disperse dye multiphase fluid. The results show that the stability, spreading area on the transfer paper and transfer rate increase with decreasing the particle size of disperse dye in multiphase fluid. The droplet formation process of multiphase fluid from a fine pinhole is composed of ejection, stretching, necking, pinch-off, recoil and recombination of primary drop and satellite. The larger particle size of the disperse dye, the shorter droplet pinch-off time is. And the larger disperse dye content leading to the smaller pinch-off time. A small droplet following the primary particles is formed when disperse dye content is high.
C.I. disperse dye blue 60 was encapsulated by poly(styrene-maleic acid) using phase separation technique, followed by the preparation of the encapsulated disperse dye dispersion. The effects of process conditions on particle size of the dispersion were investigated. The results showed that the particle size of the encapsulated disperse dye dispersion was small, and the stability was excellent when mass ratio of poly(styrene-maleic acid) to disperse dye (Rp/d), dropping speed of phase separation agent (Ds), disperse dye content in dispersion (Cd), and dispersing time (Dt) were about 20%, 7 mL/min, 5–7.5%, and 1.5 h, respectively. Transmission electron microscope (TEM), zeta potentials, and contact angle indicated that C.I. disperse dye blue 60 was successfully encapsulated by poly(styrene-maleic acid). © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Purpose
– The aim of this paper was to prepare a stable fluorescent disperse yellow paste by wet grinding process by adding naphthalene sulphonic derivative dispersing agent.
Design/methodology/approach
– The dispersants 2-naphthalenesulphonic acid (NNO), naphthalene-sulphonic acid (MF) and benzyl naphthalene sulphonate formaldehyde condensate (CNF) were used to disperse the yellow dye. The particle size of the paste was characterised by particle size analyser. The paste centrifugal stability, diffusion properties, morphology and thermal properties were also tested for assessing its stability which could be helpful to prepare inks with good stability.
Findings
– The particle sizes of dye pastes with dispersing agent NNO, MF and CNF were 161.1, 150.0 and 136.0 nm, respectively, after grinding for 6 h. The dye paste grinded with dispersing agent CNF presented good centrifugal and thermal properties. TEM images demonstrated that the morphologies of dye pastes grinded with dispersing agent MF and CNF were homogeneous nearly spherical nanoparticle and rarely generated agglomeration and precipitation.
Originality/value
– The paste used for aqueous inkjet ink exhibited excellent thermal stability.
Here we report the synthesis of polymer stabilised anthraquinone dye-based aqueous nanoparticles using evaporative precipitation from dichloromethane into water and their use as novel aqueous inkjet colorants. Polymer stabilised dye nanoparticles in the 100 nm size range are demonstrated and the mechanism of formation of stable nanoparticles and the role of polymer stabiliser design is discussed. Formation of stable small particle size nanoparticles requires a fast dye crystal nucleation rate followed by a subsequent slow growth rate so as to avoid Ostwald ripening. Rapid nucleation can be achieved by metering small amounts of water-miscible organic solution of the dye to the non-solvent water under rapid mixing, referred to as quasi-emulsion solvent diffusion (QESD). These conditions result in high-supersaturation which causes spontaneous nucleation, followed by a rapid decrease in local supersaturation and hence slow crystal growth rate.
The influence of toner shape on the toner performance was investigated. Toner particles were thermally or mechanically modified to make variations in shape from irregular to quasispherical shape. In addition to the typical developing characteristics such as transfer efficiency, the developing characteristics were investigated by observing the degree of toner contamination on the developing roller with an electron microscope and measuring the charge of the toner particles on the developing roller on continued development. It was found that the surface of the developing roller was gradually contaminated to form an additional thin film made of toner materials after a long run developing process. This contamination played a major role in the decrease of the toner charge, especially in the late part of the cartridge life. The degree of contamination was found to be dependent critically on the toner shape and the structure of the toner surface. Both thermal and mechanical modifications worked to reduce the contamination, thus improving the lifetime of toner performance.
