Modified aqueous polyurethane ink containing cellulose nanometer crystals and preparation method thereof

Abstract

The invention discloses modified aqueous polyurethane ink containing cellulose nanometer crystals. According to the printing ink, hexafluorobutyl methacrylate and glycidyl methacrylate are used for performing modification treatment on aqueous polyurethane; the water resistance of the modified polyurethane is improved; the added cellulose nanocrystals are subjected to grafting modification treatment through pentaerythritol oleate and titanate coupling agents, and then, better dispersion performance and better bonding performance are realized in the polyurethane emulsion; the mechanical property of the ink is effectively enhanced; the pigment retentivity and the printing adhesiveness are better; the prepared ink has good film forming performance; the water resistance, light resistance and aging resistance are good; the color is uniform and stable; durability is realized.

Description

technical field [0001] The invention relates to the technical field of water-based inks, in particular to a modified water-based polyurethane ink containing cellulose nanocrystals and a preparation method thereof. Background technique [0002] Water-based ink is composed of water-soluble resins, organic pigments, solvents and related additives. It has excellent environmental protection and can alleviate the current pollution problems in the packaging and printing industry. It has become the key development direction of the ink industry at present and in the future. [0003] Water-based polyurethane ink has the advantages of good color expression, good adhesion, oil resistance, etc., and has wide applicability to various substrate materials. Due to the presence of hydrophilic groups in waterborne polyurethane, the coating formed by it has poor water resistance, heat resistance and viscoelasticity, especially the difference in water resistance, which directly affects the exper...

AI Technical Summary

Problems solved by technology

Due to the presence of hydrophilic groups in waterborne polyurethane, the coating formed by it has poor water resistance, heat resistance and viscoelasticity, especially the difference in water resistance, which directly affects the experience of printing products. Performance is further improved to perfect its performance

"Preparation and Characterization of Nano-Silica Modified Waterborne Polyurethane Dispersion" In the article, a silane coupling agent was used to hydrolyze and disperse in a polyoxypropylene glycol solution to prepare a nano-silica polyoxypropylene glycol dispersion, which participated in the synthesis of water-based polyurethane process, obtained nano-silica modified water-based polyurethane emulsion, the hydrophobicity and surface hardness of the polyurethane coating obtained by this method have been improved to a certain extent, but its tensile strength and elongation at break have decreased accordingly. The mechanical properties are poor, so it can be seen that obtaining an emulsion with excellent mechanical properties while improving the hydrophobicity of water-based polyurethane is the research focus with practical application value, and it is also the purpose of the present invention