| Polyacrylate emulsion has become widely used film forming material with its excellent performances of film-forming, cohesiveness, weather resistance, and gloss and color retention. However, the polyacrylate film has drawbacks such as poor water resistance, and is unfit for high-grade products. Introducing inorganic nanoparticles into polymer could combine the advantages of nanomaterials on the premise of maintaining the superior characteristics of traditional polymer, and could also obtain excellent comprehensive performances for a synergistic effect of both. In this study, zinc oxide nanoparticles were introduced into polyacrylate emulsions by in-situ polymerization and Pickering emulsion polymerization. The application performance of the composite emulsions in textile pigment printing and leather finishing were investigated.Zinc oxide nanoparticle was modified by vinyltriethoxysilane. Polyacrylate emulsion was prepared by emulsion polymerization using acrylate monomers. Polyacrylate/nano-Zn O composite emulsion was prepared by introducing the modified zinc oxide nanoparticle into the polyacrylate emulsion polymerization system via in-situ polymerization. The composite emulsion was used for textile pigment printing and leather finishing, and its application performance was investigated. Particle size of modified zinc oxide nanoparticle was larger compared with unmodified zinc oxide nanoparticle. Polyacrylate/nano-Zn O composite emulsion had a relatively uniform particle size of 190~200nm. Zinc oxide nanoparticle feeding ways had little effect on particle size and its monodispersity of the composite emulsion but affected the particle size distribution. The existence of zinc oxide nanoparticle enhanced the initial thermal decomposition temperature of the composite film. Zinc oxide nanoparticle feeding ways had little effect on application performance of the composite emulsion in textile pigment printing. Dry and wet rubbing fastness of the printed cotton fabric achieved 3 grade above and 2 grade above separately. Soaping fastness demonstrated 4 grade and the hand feel was soft. Leather samples finished by the composite emulsion had the dry rubbing fastness of 4 grade and wet rubbing fastness of 1~2 grade. Compared with the leather samples finished by conventional polyacrylate emulsion, leather samples finished by the composite emulsion showed better air and water vapor permeability.Polyacrylate/nano-Zn O composite emulsion was prepared via Pickering emulsion polymerization using methyl methacrylate(MMA) and butyl acrylate(BA) as monomers, and zinc oxide nanoparticle and ammonium allyloxtmethylate nonylphenol ethoxylates sulfate(DNS-86) together as stabilizers. The composite emulsion was used for pigment printing and leather finishing, and its application performance was investigated. Stability of Pickering emulsion was better when the ratio of oil to water was 4:6, emulsifying time was more than 5 min, and MMA was used for oil phase monomer. The emulsion stability improved with an increase of the dosage of zinc oxide nanoparticle and DNS-86. Performance of the composite emulsion was better when mass ratio of BA to MMA was 6:4, the dosage of zinc oxide nanoparticle was 7wt%, and the dosage of DNS-86 was 2wt%. Average size of the spherical-like hybrid particles was about 450 nm. Some zinc oxide nanoparticles were located at the surface of the polymer particles. The initial thermal decomposition temperature of the composite film was improved due to the existence of zinc oxide nanoparticles. The cotton fabric printed by the composite emulsion had the dry rubbing fastness of 4 grade, wet rubbing fastness of 3 grade and soaping fastness of 4~5 grade. Fabric printed with the composite emulsion had improved color fastness and excellent ultraviolet radiation shielding performance in comparison with that printed with polyacrylate emulsion. Leather samples finished by the composite emulsion had the dry rubbing fastness of 4 grade and wet rubbing fastness of 2 grade. The wet rubbing fastness was better than that finished by the composite emulsion prepared via in-situ polymerization and conventional polyacrylate emulsion. Compared with the leather samples finished by conventional polyacrylate emulsion, leather samples finished by the composite emulsion showed better air and water vapor permeability.From the study of polyacrylate/nano-Zn O composite emulsions prepared by the two kinds of emulsion polymerization means, it could be said that the introduction of zinc oxide nanoparticle into polyacrylate emulsion was beneficial to improve the thermal performance of polyacrylate film. Fabric printed with the composite emulsion prepared by Pickering emulsion polymerization had better color fastness compared with that printed with the polyacrylate emulsion. Leather samples finished by the two composite emulsions had better air and water vapor permeability than that finished by the conventional polyacrylate emulsion. Wet rubbing fastness of the leather sample finished by the composite emulsion prepared via Pickering emulsion polymerization was superior to that finished by the composite emulsion prepared via in-situ polymerization. |
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