Anli Tian

Properties of alginate fiber spun-dyed with fluorescent pigment dispersion.

Spun-dyed alginate fiber was prepared by the spun-dyeing method with the mixture of fluorescent pigment dispersion and sodium alginate fiber spinning solution, and its properties were characterized by SEM, TGA, DSC, and XRD. The results indicate that fluorescent pigment dispersion prepared with esterified poly (styrene-alt maleic acid) had excellent compatibility with sodium alginate fiber spinning solution, and small amount of fluorescent pigment could reduce the viscosity of spun-dyed spinning solutions. SEM photo of spun-dyed alginate fiber indicated that fewer pigment particles deposited on its surface. TGA, DSC, and XRD results suggested that thermal properties and crystal phase of spun-dyed alginate fibers had slight changes compared to the original alginate fibers. The fluorescence intensity of spun-dyed alginate fiber reached its maximum when the content of fluorescent pigment was 4%. The spun-dyed alginate fiber showed excellent rubbing and washing fastness.

Effect of pigment particle character on dyeing performance of cotton fabrics

The cotton fabrics were dyed by exhaust method using the pigment dispersions as colorant, and meanwhile the effects of particle character on dyeing performance were further investigated. The results showed that the larger zeta potentials, the higher K/S value, pigment uptakes, rubbing and washing fastness of the dyed cotton fabrics were. Adsorption isotherms were belonging to Langmuir type when zeta potentials were about 0.46 mV and 31.39 mV respectively. The cotton fabrics that dyed by the pigment dispersions with small particles had high K/S value, rubbing and washing fastness. The chemical structure of pigment had little influence on pigment uptakes, and all kind of pigment dispersions reach to 98 % uptakes after 30 min but exhibit various uptake rates at initial stage.

Regenerated cellulose fibers spun-dyed with carbon black/latex composite dispersion

A carbon black (CB)/latex composite was prepared by the method of miniemulsion polymerization for use as a colorant for spun dyeing of regenerated cellulose fibers. Analysis of experimental results revealed that the CB/latex composite had a small particle size and a narrow particle size distribution which were important to ensure a stable dispersion being later added to spinning solution. A good stability of the prepared CB/latex composite dispersion in the spinning solution indicated that it was highly possible to use the CB/latex composite as a colorant for spun dyeing of regenerated cellulose fibers. When a 3.5% mass ratio of CB/latex composite to cellulose was used for spun dyeing, the spun-dyed fibers had the highest tensile strength, breaking elongation and color strength. The rubbing and washing color fastnesses of spun-dyed regenerated cellulose fibers could satisfy requirements of most textiles. This study provided a new insight into producing spun-dyed regenerated cellulose with a novel colorant.

Preparation of SiO2/PSSS dispersion for formulation of white inkjet ink

SiO2 particles were prepared by sol–gel method and further modified with γ-methacryloxypropyltrimethoxysilane (KH570). A SiO2/PSSS composite was prepared with a core–shell structure, by the in situ polymerization of p-styrene sulfonate sodium (SSS) and the reaction with the KH570-modified SiO2. The SiO2/PSSS composite was optimized by adjusting the mass ratios of KH570 to SiO2, SSS to SiO2 and APS to SSS for control of the particle size and polymer layer thickness. Fourier transform infrared spectrum, contact angle and thermogravimetric analysis indicated that PSSS was successfully coated onto SiO2 particle surface. Transmission electron microscopy images showed that the prepared SiO2/PSSS dispersion had small particles and narrow particle size distribution. The white inkjet ink prepared from the SiO2/PSSS dispersion exhibited excellent thermal and centrifugal stabilities. The white inkjet ink was applied for pretreatment of fabric before colored printing which resulted in a significant enhancement of pattern brightness.

Coloration of aluminum pigment using SiO2 and γ-glycidoxypropyltrimethoxysilane with dichlorotriazine reactive dye

Purpose The purpose of this paper is to colour aluminium pigment to the highest chroma using SiO2 and organic silane with dichlorotriazine reactive dye and investigate its reaction mechanism, chemical stability and thermal properties to improve its applicability in surface coatings. Design/methodology/approach Aluminium pigment was encapsulated by the catalysed sol-gel method using SiO2, followed by modification with γ-glycidoxypropyltrimethoxysilane (GPTMS). Purified reactive dye (1-Amino-4-[3-(4,6-dichlorotriazin-2-ylamino)-4-sulfophenylamino]anthraquinone-2-sulfonic acid (X-BR)) was covalently immobilized onto modified SiO2 to obtain coloured aluminium pigment. The reaction mechanism, chemical stability and thermophysical properties were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscope, transmission electron microscope and thermogravimetric analyses (TGA). Findings The results showed that X-BR was covalently attached to modified Al/SiO2 with maximum colour grafting of 95 per cent when the dosage of GPTMS and X-BR per weight of modified Al/SiO2 was 25 and 15 per cent, respectively, at pH 8.5 and a temperature of 40°C. The coloured aluminium pigment had good chemical stability with excellent anti-migration properties in many solvents. Research limitations/implications The organic silane used required a careful control of pH to ensure maximum colour grafting efficiency meanwhile other silanes with amine groups could also be used effectively with different kinds of colorants besides reactive dyes. Practical implications The method used is less cumbersome and provides a simple route to preparing coloured aluminium pigment. Originality/value The use of organic-inorganic SiO2/γ- GPTMS with purified reactive dye to covalently colour aluminium pigment to the highest chroma is novel and will help advance the frontiers of knowledge on coloration of aluminium pigments.

Influence of diffusion behavior of disperse dye ink on printing accuracy for warp-knitted polyester fabrics

The diffusion behavior of disperse dye ink on untreated warp-knitted polyester (WKP) fabric for ink-jet printing was investigated. The results showed that disperse dye ink diffused along the yarn, and the loops and underlap structure of WKP fabric had a significant influence on printing accuracy. The effect of ink volume on the diffusion shape of ink on pretreated fabrics using a cationic modification agent (B-1), sodium alginate (SA), and polyvinyl alcohol (PVA) was also investigated. It could be observed that ink volume and pretreatment agents had a great influence on the diffusion shape and printing accuracy. The diffuse width of disperse dye ink on WKP fabric in the wale direction was wider than that in the course direction when the droplet size was less than 0.2 µL, whereas the ink diffused mainly along the course direction. Moreover, the diffuse width of ink on B-1 pretreated fabric was smaller than that on the fabric pretreated with SA or PVA for the thick fabric (230 g/m2). Compared with the untreated and pretreated fabrics using SA or PVA, the color strength (K/S) and saturation (C*) value of the B-1 pretreated fabric increased. However, the diffuse width of ink on SA pretreated fabric was smaller than that on the fabric pretreated with B-1 or PVA for the thin fabric (110 g/m2).

Formulation of nanoscale copolymer-SiO2 dispersion via miniemulsion polymerization for application in white inkjet ink

Purpose The purpose of this study is to prepare nanoscale copolymer-silicon dioxide (SiO2) dispersion for formulating textile printing white ink. Design/methodology/approach Nanoscale copolymer-SiO2 dispersion was prepared via miniemulsion polymerization. The miniemulsion formulation was optimized for preparing stable SiO2/O/W miniemulsion and nanoscale copolymer-SiO2 dispersion. The nanoscale copolymer-SiO2 was investigated by transmission electron microscope (TEM), X-ray diffraction (XRD), differential thermal gravity (DTG) and thermogravimetric analysis (TGA). The performance of white inks from this colorant was further investigated. Findings Nanoscale copolymer-SiO2 had a core-shell structure with about 45 nm encapsulated copolymer layer when it was synthesized under optimal miniemulsion formulation 60 per cent mass ratio of styrene (St) to KH570-SiO2, 5.0 per cent hexadecane to St and 2.0 per cent concentration of DNS-86. The nanoscale copolymer-SiO2 white ink had high thermal and centrifugal stability with high purity and color fastness. Research limitations/implications The miniemulsion polymerization conditions required a careful control before favorable results could be achieved. Practical implications The nanoscale copolymer-SiO2 dispersion and white ink prepared by this method showed excellent stability. This research could accelerate the textiles inkjet printing application. Originality/value The reactive stabilizer DNS-86 is innovatively introduced into the miniemulsion polymerization to improve the stability of the nanoscale copolymer-SiO2 dispersion. The white ink was formulated from nanoscale copolymer-SiO2 to improve the fastness of the printed fabrics.