Synthesis of waterborne acrylic copolymer resin as a binding agent for the development of water-based inks in the printing application

In this study, a new waterborne acrylic copolymer resin (acrylic-co-resin) was synthesized to develop water-based printing inks on polyester (PET) film. The synthesized acrylic resin showed good water solubility, high acid value (120 mg KOH/g), about 57% solid content. The developed water-based inks (cyan, magenta, and yellow) exhibited small particle size (<1 μm) and optimum surface energy within required values (31.5, 32, and 30 mN/m) for good adhesion of ink upon PET films. The developed inks also showed good storage stability for 30 days. Further, to evaluate the application performance, the inks were printed on corona-treated PET films at room temperature, and the ink drying time was measured. Further, the inks were printed on the corona-treated PET film to evaluate the application performance. The developed inks showed a short drying time (7–9 s), which indicates their fast drying nature. Moreover, the developed inks showed good printability, color strength, high adhesion, and excellent rub-resistant properties. Thus, the overall results demonstrated the potential of water-based inks in printing applications.     

Effects on print quality of varying acrylic binder types in water-based flexographic ink formulations

The ink industry is one of the world's largest markets due to the increasing demand for printing inks for the packaging industry. Flexography printing is a well-known promising technology for large-area printing due to its high printing speed and roll-to-roll capability to print economically on a variety of surfaces and is used in nearly in all areas of packaging printing. Water-based inks are considered non-toxic, odourless, and more environmentally friendly options compared to solvent-based inks. Therefore, in this article, the goal was to develop new water-based ink formulation with different acrylic binders for flexographic printing on commercial solid bleached sulphate (SBS) board. Five inks were formulated with four different acrylic binders and compared to a commercially available ink to study their performance. The developed inks were investigated with regard to their print qualities and print characteristics. It was found that the binder type influenced some print quality while the effect was not significant for others. Using flexography printed cyan inks, the ink formulated with the highest molecular weight had the lowest print density and the largest tonal value increase (TVI) observed between 40 and 60 tone values. The same ink had the largest mottle values and variation in topography. For values of print contrast and delta gloss at 75°, although differences were observed between average values, data had inconclusive variation and spread around averages, where no conclusive trends or effects of acrylic binder type on these response factors were observed. Print chroma and dot roundness results were equally close for all printed samples.     

酮醛改性水性丙烯酸酯树脂的合成及性能研究

以丙烯酸、丙烯酸酯、甲基丙烯酸酯等为基料，在过硫酸铵引发下，加入醛酮树脂进行改性聚合，合成了几种不同的酮醛改性的水溶性丙烯酸树脂，将上述树脂加入颜料、消泡剂、分散剂等，制成水性油墨，经测定其成膜性、耐磨性、耐水性等性能均达到水墨在印刷上所要求的标准。     

Synthesis of waterborne polyurethane ink binder with high T-peel strength and its application in biaxially oriented polypropylene film printing

In order to improve adhesion properties of waterborne polyurethane (WPU) inks on biaxially oriented polypropylene (BOPP) films, herein, a liquid polyester polyol BY3003 with long-branched aliphatic chains was used to prepare WPU latexes suitable for BOPP films printing. The application of BY3003 made the surface tension of the prepared latexes not more than 43 mN/m, while that of traditional WPU latex exceeded 55 mN/m. Accordingly, the T-peel strength of the inks made from these latexes was all above 0.8 N/15 mm. In addition, post chain extension degree, dimethylol butyric acid content, and NCO/OH molar ratio also had significantly effect on latex and film properties of WPU, especially on the T-peel strength of the corresponding inks. By optimizing these factors, a WPU latex with surface tension as low as 39.6 mN/m and adhesion fastness over 95% on BOPP film were obtained, and the T-peel strength of its corresponding ink was up to 2.05 N/15 mm, which is the highest value recorded in the literature as far as we know.     

Usability of cellulose-based binder in water-based flexographic ink

Packaging must have a good commercial appearance and is generally obtained by ink transferred to its substrate. It is important that the ink used in packaging printing is produced from environmentally friendly and sustainable raw materials as well as being suitable for the printing system. The increasing demand in the field of printed packaging and the scarcity of resources to meet this demand have accelerated the search for new sources for inks. For this purpose, inks produced in the laboratory using a modified cellulose-based binder, a commercial acrylic resin and a commercial soybean protein were compared with a commercial ink. As a result of the study, it was determined that the printability properties of the ink obtained by using the modified cellulose-based binder were better than the ink obtained with commercial soybean protein. It was determined that it showed printability properties close to the ink produced with commercial acrylic binders. By using modified cellulose-based water-based flexographic ink instead of other commonly used binders, more environmentally friendly sustainable inks can be produced.     

表面活性剂对水性油墨干燥速度的影响

色浆研磨时的分散剂用量和成墨过程中润湿剂的用量对水性油墨的干燥速度有较大影响。用量适当可提高干燥速度;若用量不当,不但降低干燥速度,而且将影响水性油墨的粘度、细度和附着牢度。     

Development and characterization of inks for screen printing of glass solders for SOFCs

Glass ceramics are supposed to produce stable sealants between ceramic electrolyte and ferritic steel in planar SOFC stacks. The screen printing method is a suitable industrial process in order to produce layers with tailored height and width reproducibly. An appropriate suspension was developed for this application and improved by adjusting the additive composition. This study investigates the rheological behavior of screen printing inks and the corresponding topography of the printed layers. Rotary measurements were carried out to analyse the impact of shear rates on viscosity showing shear thinning behavior. In addition, oscillatory rheometry is performed to gain information about the viscoelastic properties of the slurries and to understand the internal structure of the developed inks. The viscoelasticity and the recovery behavior after shear loading are crucial for the topography of printed films. The principal investigations are executed on solvent-based suspensions, whereby the knowledge gained is used for a transfer to water-based systems allowing a more environmentally friendly handling.     

喷墨打印机颜料型油墨的最新进展

喷墨打印技术是一种非接触式的数字印刷技术,它将数码技术与传统的印刷技术合二为一。用于喷墨印刷的染料型墨水通常表现出差的耐光性和耐水性,因此将颜料引进到喷墨油墨中以克服染料型墨水的缺点是必然趋势。为了在低粘度下保持颜料稳定的分散,性能优异的合成分散剂对于获得稳定的颜料分散体是必不可少的。本文介绍了水性喷墨油墨的组分及各组分作用,对喷墨油墨的生产技术、发展前景进行了展望。     

塑料水性凹印油墨附着性能的研究

采用合适的颜基比和分散剂制备了塑料水性凹印油墨基墨,用与基墨具有良好相容性的树脂溶液调稀基墨,添加各种助剂以改善油墨样品的印刷适性,探讨了颜基比、树脂溶液、助剂对油墨附着力的影响。结果表明:基墨中颜基比为3:1、分散剂为1.5%时油墨在PET和BOPP塑料表面均有较好的附着力,制备油墨时,使用50%的AZ-3808树脂溶液并添加1.5%异丙醇或1.5%润湿剂时,油墨在PET塑料表面具有较好的附着力,使用50%的1424树脂和1437树脂的混合溶液并添加1.5%异丙醇时,油墨在BOPP塑料表面具有较好的附着力。     

复合软包装用水性聚氨酯油墨的制备与性能

用不同结构的聚酯二元醇或聚醚二元醇制备水性聚氨酯( WPU)油墨,分别探讨了不同二元醇结构制备的WPU油墨对基材附着牢度、聚己二酸乙二醇-丁二醇酯(PBA)体系的硬段含量对水性油墨抗返粘性、交联剂对水性油墨耐湿性、乙醇溶剂对水性油墨干燥速度的影响.结果表明,用PBA制备的WPU油墨具有较好的附着牢度;硬段质量分数40％...