Advanced Materials Research Vol. 380

Abstract: People pay more and more attention to water-based printing inkjet ink which has no environmental pollution and fits environmental protection requirements. Inkjet printing technology could be applicable small batch and various variety products and satisfy the customer’s personalized requirements. Resin as one of the main compositions of printing inkjet ink has important effects on ink’s performance. To determine the effects of resin on the performance of water-based printing inkjet ink, adopting grinding method prepare the samples by changing resin and its proportion. By testing the samples’ particle size, viscosity, surface tension, pH value, the effects of resin on the water-based printing inkjet ink were analyzed. The results show that the type of resin and composite ratio has some effects on the performance of printing inkjet ink. When the resin was mixed in accordance with Resin B/Resin C=29/21, the performance of printing inkjet ink which was diluted with this resin was better.

Abstract: Environment protection has aroused big concern in industrial development nowadays, and the printing industry has always been known as a big paper consumer and environmental pollution "contributor". In 1980s, Europe and the United States pioneered the concept of environment-friendly printing. China has also issued “Regulations for Environmental Labeling Products—Ink” since the 2008, which contains similar provisions of limited demand with those regulations of USA, EU, Japan, New Zealand and other countries. Environment-friendly ink is the key to achieve environment-friendly printing, and fine chemicals as an indispensable component is the sticking point to control. This paper describes the relevant laws of environment-friendly ink, types of environment-friendly colorant and the actual application, such as in inkjet and flexographic printing field.

Abstract: The performances of three kinds of water-based pigment inks were compared and studied, which include self-made ink, original printing ink and compatible ink. Art paper, matte paper and white card paper were used as the substrates. Testing the contact angle of ink droplets, the spreading, wetting, and drying rate of inks were investigated. The color density and CIE L*a*b* values of the printed samples were measured, to evaluate the hue error and color gamut. The water resistance was studied with corresponding experiments. The result indicates: self-made water-based pigment ink has the smallest contact angle on coated paper, showing a faster drying rate. Its color gamut is similar to the original printing ink on art paper, and the hue error is low. Through the water resistance test, the color density measured on art paper and matte paper had no changes, without color dissolving and color fading, showing good water resistance applicability.

Abstract: The ink used in food packaging is facing great challenge with the increasing of food safety requirements. In this paper, a kind of nano-SiO₂ water-based ink was studied which combined the anti-UV & anti-bacterial characteristics of nano-SiO₂ with the advantage of non-polluting water-based ink. Nano-SiO₂ was prepared by the chemical precipitation method and characterized by XRD and Malvern zetasizer Nano-ZS. Sodium silicate solution and NH₄CI solution were used as the reagent. The experimental results showed that the average size of nano-SiO₂ was less than 100nm, and it was a kind of amorphous powder. The homemade powder of nano-SiO₂¬, water-based ink and dispersant PVP were mixed using Ultra–wave dispersion, and the anti-UV & anti-bacterial water-based ink could be prepared. The UV absorption experiment of this ink shows that the absorption rate was nearly 100%, and the anti-Escherichia.coli(anti-E.coli) experiment showed that the anti-bacterium rate could reach 90%. This study has good application prospect in anti-aging property of ink and the area of food safety packaging.

Abstract: _{Subscript textSubscript text}Epoxy resins have been widely used for inner coating in food can and other chemical products storage containers. Differential scanning calorimetry (DSC) was used at different heating rates to study the cure kinetics of the diglycidyl ether of bisphenol A (DGEBA) with a methanol etherified amino resin (MEAR). The apparent activation energy derived from Kissinger and Ozawa methods is 35.67KJ/mol and 40.27kJ/mol, respectively. The reaction order evaluated by Crane equation is 0. 95 and the frequency factor is 1.12×10⁴s^-1. Reaction mechanism was monitored by FTIR spectra of the reaction mixtures before and after curing. The curing reaction below 200°C is between alkoxylmethyl (>NCH₂OCH₃) and epoxide group, not between alkoxylmethyl and hydroxyls.

Abstract: Photochromic spiropyran material is of the most extensive and in-depth category. Small molecule spiropyran ring by UV irradiation, the color is less stable body, which restricts the widespread use of these compounds. In this paper, the introduction of spiropyran compounds with substituents on the group method of open-loop stability, which will contain active groups spiropyran monomers in the polymer side chain connected to a rigid polymer to limit the use of spiropyran ring merocyanine body rotation, so that the body color is more stable. This selection and design of the process is simple with R = CH₂OCOC (CH₃) =CH2 groups spiropyran monomer compounds, and then with methyl methacrylate polymer formed by radical means. By IR, NMR spectroscopy, mass spectrometry and gel permeation chromatography of the target compounds were characterized. UV spectrometer using the compounds of new photochromic properties were tested and the results shows spiropyran monomers and polymers have good photochromic properties. Discoloration kinetic of the spiropyran monomers and polymers in polar solvents proved to the spiropyran side connected to the polymer chain can significantly improve the stability of the color body.

Abstract: Ink is one of “the four treasures in the study”. Inks prepared by the traditional materials is usually in the form of Chinese ink and ink stick, which are unsuitable for the modern printing technology such as screen printing, offset print, gravure or flexo printing. On the other hand, modern commodity printing inks most prepared by modern chemical pigments and chemical reagents, which would emit a certain amount of pollutants. Reproduction of Chinese ancient books, if printed by using modern commodity printing inks, would lost their lasting ancient charm such as antique, quaint, hoary, vintage, archaic, etc. In the present research, a new black water based ink is prepared by Chinese traditional materials such as, Chinese wood oil soot, bone glue, borneol, musk, pepper, etc. not including any modern chemical reagents which could cause pollution of the environment. The viscosity, fineness and rheology property of the ink were characterized. As an application example, the ink is used to duplicate the Tripitaka book sample by screen printing on Xuan papers. The original is the Tripitaka printed in the Ming Dynasty and from the temple of Wutaishan, Shanxi Province, China. The Reproduce is lasting ancient charm and durable.

Abstract: In order to observe the influence of monomer on the printing quality of UV waterless offset ink, ink samples with different monomer were made, and the main performance parameters such as viscosity, thixotropy, yield value, fluidity and stickiness were tested. Proofing by printability tester, and the printing qualities such as solid density, gloss, dot gain and print contrast were tested. Analyzing the influence of the difference of ink performance that caused by monomer on the printing quality of UV waterless ink. The results show that ink performances affect the printing quality directly. The differences of monomer’s structure and functionality have great effect on ink’s performance such as viscosity, thixotropy, yield value, fluidity and stickiness, and it can lead to the difference of printing quality such as solid density, gloss, dot gain, and print contrast.

Abstract: The emulsification ratio of ink has an important effect on ink-transfer performance and printing quality. The UV offset ink of gold and silver cardboard was prepared by three-roll grinder. Ink was emulsified by adding different amounts of water and the ink samples with different emulsification ratio were made. Printability tester was used to proof, test the ink transfer performance, set up Ink transfer equation, confirm the parameters of f’，b and k, and investigate the influence of emulsification ratio on ink-transfer performance. Test the solid density, dot gain and relative contrast value of proofs, analyze the effect of emulsification ratio on printing quality. The research results show that when the ink of plate was large, the amount of ink transfer and the volume of ink on the plate are basic in a linear relationship. When the emulsification ratio of ink is 11.76%, the value b, the solid density and relative contrast value are the biggest. When the emulsification ratio of ink is 6.25%, the value f’ is the biggest. The dot gain is the smallest while the emulsification ratio is 15.67%.

Abstract: The water-based pigment ink jet emulsion whose particle size was less than 100nm was synthesized by the polymerization of methyl methacrylate, butyl acrylate and ethylhexyl acrylate, and anionic reactive surfactant and nonionic surfactant were used as the emulsifiers. The effects of particle size and water resistance were studied. The glass transition temperature was tested by differential scanning calorimetry. The average particle size of emulsion was range from 60nm to70nm, zeta potential value was less than -60mv; viscosity was 3.5mps; water absorption was 5.9%.