Ink composition of the liquid part is called binders; solid components of pigment (pigments or dyes); and various additives. Binder is a certain viscosity, gel fluid, and its role as a pigment first carrier, the pigment powder mixture of solid particles such as linking, pigment is dispersed in them, relying on its wetting easier to study in the grinding machine was fine; secondly as a binder, the pigment eventually fixing the substrate surface to achieve the display text, images, tags, decorative purposes. Rely on its role in adhesion, ink was able to Print Machine is transferred, delivered. Finally, in the printed product, the connecting material also plays a protective film role, and presents the necessary gloss, and even protective role of the substrate.
Binders quality directly influences the performance of ink, because the connection material to a large extent determine the viscosity of ink, adhesive, dry, mobility and other properties. To get high-quality ink, we must re-use high-quality binders. Ink various properties of materials determine the use of printing ink to adapt to the various properties, for Plastic Resin used in gravure inks generally include polypropylene, polyamide, polyurethane, etc.. For a long time, its low cost of chlorinated polypropylene, excellent adhesion and other properties of the OPP take gravure printing ink resin composite in than half of the market, but its biggest shortcoming is its main solvent toluene, usually Environmental protection Solvent such as esters, alcohols solvent is powerless. Solvent-based polyurethane printing ink binders with ease of use, performance and stability, strong adhesion, excellent gloss, and good heat resistance, suitable for all printing requirements, especially for network printing, plastic Package And composite films and so on. Foreign 70's was the 20th century to achieve industrialization, such as Japan and Japan companies, Dainippon Ink & Chemical Industry and Takeda Pharmaceutical and other domestic uses polyurethane printing ink binders are generally imported from abroad, polyurethane rubber, and then processed using, in demand will reach 30,000 tons. In recent years, domestic production and scientific research units have been involved in many ink connection material of polyurethane, and have achieved good results, such as resistance to 121 and 135 cooking Ink material production has been flat and widely used in market However, overall performance of products compared with imported products have a certain gap, improve product performance and development of multi-functional integrated product is the material of PU Ink focus of the study. Beijing High-League Chemical industry Co., Ltd. from polyurethane structural features, functionality and features hands-on polyurethane printing ink binders depth research, developed a kind of gloss better, more cohesive strength, and good compatibility with pigments on alcohol solvent compatibility and good features such as polyurethane printing ink binders, and to the market, get a better response.
Ink generally used in polyurethane resin is polyester / polyether polyol and isocyanate instead made of molecular force of about 20,000 ~ 40,000. The solvent mainly benzene, ketone, ester solvent as the main solvent. In the development process can be based printing ink plant and environmental needs, using solvents or alcohol ester ketone ester The preparation of benzene solvent ink resins.
Ink characteristics of polyurethane resin 1. Excellent anti-yellowing properties Ink preparation process of polyurethane resin in the mainly aliphatic polyester and aliphatic isocyanate as the main materials, more aromatic polyurethane has excellent optical stability, film after film has excellent anti-yellowing properties.
2. Excellent substrate for thin film adhesion fastness
Ink polyurethane molecular chains containing urethane, urea-based A ester, ester, ether and other polar groups, with a variety of polar substrates, PET, PA and other plastic surface of the polar groups the formation of hydrogen bonds, thus forming a certain connection strength of joints. Polyurethane resin of the ink, the printing surface in the polar plastic substrates with excellent adhesion fastness.
3. And pigments / dyes have good affinity and wettability
Ink generally polyester or polyurethane polyether polyols, alicyclic diisocyanate and diamine / diol chain extender Preparation, molecular weight of about tens of thousands. I am an expert from China Print Net, usually analyzes all kind of industries situation, such as how to grow sunflowers , chicken salad with grapes.
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