Binders For Pigment Printing Research Articles

A new route for synthesis of polyurethane vinyl acetate acrylate emulsions as binders for pigment printing of cotton fabrics

HEREIN, two polyurethane oligomers were successfully synthesized using a prepolymer mixing process. The prepolymers were synthesized based on the step-growth addition polymerization of polypropylene glycol, Methylene diphenyl diisocyanate and 2-hydroxyethyl methacrylate or 2-hydroxyethyl acrylate. Isopropanol was functioned as the isocyanate blocking agent. Thereafter, different terpolymer emulsions were prepared by the emulsion graft copolymerization with the vinyl acetate monomer in presence of 2-ethylhexyl acrylate as a vinyl monomer. The chemical structures of the synthesized oligomeric monomers were probed by FTIR spectroscopy and found to vary with the content of acrylic monomer used in the oligomer synthesis phase (i.e.hydroxyethyl acrylate or hydroxyethyl methacrylate). The topography, thermal stability, and particle size of terpolymers were investigated by SEM, TGA, and zeta potential, respectively. The TGA results demonstrated marked enhancement in thermal stability of the synthesized terpolymers up to ca. 600°C, which was concurrent with enhanced surface homogeneity and film properties as evidenced by the SEM images. These terpolymers showed also property enhancement as binders for textile pigment printing in terms of rubbing resistance, color strength and fastness to washing when compared to the commercial binders. These judgments would provide a new competent synthesis route by introducing polyurethane acetate vinyl acrylate as the binder for use in pigment printing of cotton fabrics.

Preparation of epoxy-acrylate copolymer/nano-silica via Pickering emulsion polymerization and its application as printing binder

This paper presents a facile and efficient synthesis method to fabricate epoxy-acrylate copolymer/nano-silica latex via Pickering emulsion polymerization stabilized by silica sol. The effects of solid contents, silica concentration and polymerization time on emulsion polymerization were studied. The core-shell epoxy-acrylate copolymer/nano-silica was obtained with average diameter 690 nm, was observed by Transmission Electron Microscopy (TEM) and Dynamic Light Scattering (DLS). The formation mechanism of epoxy-acrylate copolymer/nano-silica emulsion polymerization was proposed through observing the morphology of latex particles at different polymerization time. Fourier Transformation Infrared (FT-IR) and Thermogravimetric Analysis (TGA) were used to study structure and thermostability of the composites. Morphology of the latex film was characterized by Scanning Electron Microscope (SEM). The results indicated that nano-silica particles existed in the composite emulsion and could improve the thermal stability of the film. The epoxy-acrylate copolymer/nano-silica latex was used as binder applied to cotton fabric for pigment printing. The application results demonstrated that Pickering emulsion stabilized by silica sol has good effects in the pigment printing binder without surfactant. Compared with commodity binder, the resistance to wet rubbing fastness and soaping fastness were improved half grade.

“Soft” polymer latexes stabilized by a mixture of zinc oxide nanoparticles and polymerizable surfactants: Binders for pigment printing

Abstract “Soft” polymer latexes were synthesized by Pickering emulsion polymerization. O/W emulsions were prepared using monomers as oil phase, and a mixture of zinc oxide nanoparticles and polymerizable surfactants ammonium allyloxtmethylate nonylphenol ethoxylates sulfate (DNS-86) as stabilizers, and then the “soft” polymer latexes were prepared by free radical copolymerization of monomers in oil phase of the O/W emulsions. Stabilities of both the O/W emulsions and the polymer latexes with an increase of DNS-86 were discussed. Effect of the dosages of DNS-86 on water resistance of the polymer films was reported. The polymer latex was applied as a binder for pigment printing of cotton fabrics. The emulsion droplets became smaller, the drop sizes became more homogeneous, and the gel contents of the polymer latexes decreased to almost constant with an increase of the DNS-86 concentration. TEM showed that some zinc oxide nanoparticles were located at the surface of the polymer particles. DNS-86 was conducive to improve water resistance of the polymer films. Fabric printed with the prepared polymer latex had smaller color difference, improved color fastness and excellent ultraviolet radiation shielding performance in comparison with that printed with commercial binder. However, hand feel of the cotton fabrics printed using the synthetic latex was reduced compared with that of the cotton fabrics printed using commercial binder.

Micro-emulsion co-polymerisation of butyl acrylate with acrylic acid as binder for textile pigment printing

Purpose – The purpose of this paper is to prepare nano size micro-emulsion co-polymer particles based on butyl acrylate (BA)/acrylic acid (AAc) with high monomer/surfactant ratio. The study involved the application of the prepared micro-emulsions co-polymers as textile pigment printing binders. Design/methodology/approach – The micro-emulsion co-polymerisations processes were carried out with different mixtures of BA and AAc using modified process. Sodium dodecyl sulphate (SDS) and potassium peroxy disulphate/glucose were used as emulsifier and redox initiator, respectively. The prepared emulsion co-polymer was characterized via spectroscopic measurements, FT-IR, 1H-NMR and transmission electron microscope (TEM), in addition to thermal analysis. The prepared micro-emulsion co-polymers were applied as binders for pigment printing process onto cotton fabric, polyester and cotton/polyester blend by using flat screen technique. The optimum curing conditions were determined, colour strength and fastness properties of pigment printed areas to light, washing, perspiration and rubbing were evaluated. In addition, stiffness of the prints was studied. Findings – The achieved results indicated that particle size and homogeneity of the prepared micro-emulsions depend on monomers weight ratio, initiator and emulsifier concentrations. On the other hand, the prints obtained using the prepared binders with optimum conditions have satisfactory fastness, good handle and high colour yield. Research limitations/implications – Monomers were continuously and slowly added into the polymerising system with mild stirring to avoid disturbing the stability of the micro-emulsion. Also, emulsifier and initiator concentrations should be controlled to avoid coagulation. Practical implications – The research provides textile pigment printing binder with nano particle size within the range of 24-48 nm. Using the prepared nano binders in pigment printing enhances the stiffness, handle, and fastnesses properties of the prints. Originality/value – The prepared co-polymer binders showed high-performance physico-mechanical properties; in addition, the ultimate goal of this study is to prepare a nano size binder with high monomer/surfactant ratio using a modified micro-emulsion process.

Influence of the Hydrophile-Lipophile Property of Cross-Linker on the Properties of Acrylate Latex and its Film

A series of acrylate latexes for pigment printing binder were prepared by semi-continuous pre-emulsifying emulsion polymerization, using lipophilic glycidyl meth-acrylate (GMA), ethylene glycol dimethyl acrylate (EGDMA) and hydrophilic HA (containing hydroxyl, acylamino), N-methylol acrylamide (NMA) as cross-linking monomer. The influences of cross-linker type on the particle size, viscosity and film-forming rate of latex, cross-linking degree and tensile properties of latex film were studied. It was found that the latex particle size, viscosity and film-forming rate were closely related with the hydrophile-lipophile property of cross linkers. The acrylate latex synthesized with hydrophilic cross-linkers always exhibits the characteristics of larger particle size, lower film-forming rate, higher viscosity and pseudoplastic fluid. The cross-linking degree and tensile properties of latex film generally depend on the crosslinking groups of cross-linkers and their reactivity.

Application and Study of Reactive Polyacrylate Microgel in Pigment Paint of Printed Fabric

Polyacrylate microgel emulsion was prepared by emulsion polymerization using styrene, α-n-butyl acrylate and methyl methacrylate as monomer, polyoxyethylene octylphenol ether (TX-30) and sodium dodecyl sulfate(SDS) as combine emulsifier, divinyl benzene and ammonium persulfate (APS) as initiator，respectively. The prepared microgel was analyzed by a variety of measurment methods, such as Fourier transform infrared spectroscopy and transmission electron microscopy. The effect of microgel on the rheological properties of adhesives, leveling, mechanical properties and pigment printing performance was studied. The rhelogy and the color fastness of the pigment printing binder of printed fabrics were measured by rheometer and friction color fastness test instruments, respectively. At the same time, the mechanical properties of the adhesive film was measured by strength tester. The results show that the thixotropy, leveling and mechanical properties of adhesive printing binder and pringting quality of coating fabrics were improved when the microgel was added.

Development of ecofriendly binders for pigment printing of all types of textile fabrics

For many years, improving the quality of pigment prints was the main goal in product development. Lately, economic, environmental and toxicological considerations have become more important. Using more environmentally friendly pigment preparations and auxiliary products, for example to reduce or to eliminate formaldehyde on the fabric, is currently one of the major concerns in the textile printing industry. The curable oligomers take the place of the organic solvents and work as the binder of pigments. Some novel prepared aqueous binder of polyurethane acrylate based on either polyethylene glycol or glycerol ethoxylate- co-propoxylate having zero volatile organic compounds was used for preparing printing paste for screen printing of all types of textile fabrics using pigment dyes. The highest color strength is obtained and fastness properties range between good and excellent for samples printed using polyurethane acrylate based on glycerol ethoxylate- co-propoxylate as a binder, this is true irrespective of the type of fabric used. While lower value of color strength is obtained for samples printed using Ebecryl 2002 as a commercial binder, and polyurethane acrylate based on PEG 2000 is better than polyurethane acrylate based on PEG 1000 + 2000 , unless in case of screen printed wool, the inverse is true.

UV-Curing Coatings for Textiles: Coatings with a Future

Radiation curing can offer many advantages in textile coating and printing processes. In this paper some results are given of a study on UV-curable coatings and the investigation of UV-curable binders for pigment printing.

Radiation Curable Coatings and Pigment Binders for Textile Substrates

Radiation curing has found applications in many branches of industry. This technology can also be applied in textile finishing. Coating and pigment print ing, as well as other finishing processes, can be performed successfully with UV- curing and electron beam curing (EB). This paper discloses some results of a study for UV-curable coatings and the development of UV-curable binders for pigment printing.