Cross-linking of low viscosity printing inks – printing ink, cross-linking – Printing Industry
Ink viscosity is often based on its size into a high viscosity low viscosity paste inks and liquid inks. Paste ink is the most common Offset printing ink And screen printing inks. The photogravure printing ink, flexo ink ink ink and press the viscosity is very low, so these printing inks, also known as liquid ink.
In the low viscosity (liquid inks) and drying method, by cross-linking reaction so that ink drying is a drying ink. Currently used in the printing industry, a growing number of UV curing inks and EB curing inks ( Electronic Beam curing) belongs to the crosslinking fixation areas.
Crosslinking fixation ink composition, the compound of the crosslinking agent is one link to a key component. The choice of crosslinker good or bad, affect the ink printing ink film after the drying rate; In addition, cross-linking system itself will affect the viscosity of ink and printing ink in the printing surface after the adhesive properties; third, pay Contact agent will affect the printed ink film surface of the various anti-resistance, such as printed surface of the heat resistance, light resistance, water resistance and solvent resistance and so on. In summary, the crosslinking agent is a printing ink and Varnish Formula components to improve performance and to improve the ink ink printability is an important component. Ink and Varnish in the selection of the crosslinking agent must be carefully selected to give the ink or unique characteristics of coated glazing.
Next, a brief introduction on the varnish used ink system and a lot about some of the cross-linking agent:? Oxidation system of cross-linking agent: retrospective cross-linking agent used in printing inks, unsaturated oil substances may be regarded as a veteran ink system, unsaturated oils substances occurs through the crosslinking reaction of oxygen to achieve the ink or the varnish dry fixation. Oxidation system crosslinking agent typically used in sheet-fed offset printing ink and oil-based ink, the ink used in the liquid was not much. However, the oxidation system can also be used in liquid ink crosslinking agent, but also can give the unique properties of ink, good alkali resistance is the most outstanding advantages of this cross-linking agent. In some printing this advantage is useful, such as soap Packaging Printing The surface of paper printed with a strong alkali and oxidation system at this time cross-linking agent will be able to play. Oxidisable alkyd and epoxy resin in a number of printing to meet specific applications. Oxidative crosslinking system can be coupled with the promotion of the use of oxidation catalysts, or you can without catalyst. Department of crosslinking agent can be oxidized to the ink product reliability and superior cement Resist.
Zinc ammonium carbonate and ammonium zirconium carbonate: zinc ammonium carbonate and ammonium zirconium carbonate crosslinkers such inorganic reaction with resin and carboxyl, will produce zinc, or zirconium ionic bond ionic bond ionic bond of these highly heat resistance and strong alcohol resistance. Zinc ammonium carbonate and ammonium zirconium carbonate crosslinkers generally used in these water-based ink. PH value ink formulation system, usually 9 or higher. If the PH value of less than 9, so the chemical properties of ink system will become unstable.
Silane: Silane is an accelerator to improve the ink viscosity, more specifically, alkoxy silanes. Silane can be added to solvent-based ink or water-based ink being, they can react with carboxyl resin. Chemical reaction time slightly longer. In addition, the added silane is required after the printing ink drying temperature higher. Silane has a good performance and resistance to anti-viscosity properties, these properties of the ink products were well reflected.
Organic titanate, and zirconium salts of organic: organic titanate, and zirconium salts of organic ink system is another cross-linking agent. Many ordinary ink commonly used in organic resins and organic zirconium titanate salt as the ink viscosity enhancers, such as cellulose nitrate resin and polyurethane resin and so the use of organic titanate and organic zirconium salts to improve the ink adhesion . Organic titanate, and zirconium salts of organic chemical performance is lively, so in ink formulations should be carefully prepared to ensure the stability of the ink system. Zirconium titanate and organic acid salt in organic solvent-based inks have been used for many years, now some water-based acrylic ink formulations can also see the figures of the organic titanate.
Photoinitiator: UV ink and UV Varnish photoinitiator used in the cross-linking agent are special. UV ink and UV curing Varnish principle is: first, photoinitiator (crosslinker) UV absorption of UV light equipment issued to generate reactive groups of radicals, free radicals can be polymerized to UV cross-linking monomer The formation of polymer film. After the ink drying, ink printed film gives a good gloss and resistance to anti-performance. In the current UV ink and UV Varnish There are two main types of photoinitiator: free radical photoinitiators and cationic photoinitiators, which in some UV light cured ink systems have been used for many years. Since the decision of the UV photoinitiator or Varnish ink drying speed, so the choice of photoinitiator is UV ink and varnish formulation on a key ring.
Several cross-linking agent mentioned above, has its own advantages and disadvantages. Do not have a perfect cross-linking agent. Crosslinking agent and other needed Additive Consistent with the use of ink to make printing requirements. As many toxic crosslinking agent but also the smell, obviously can not be used Food And drug packaging and printing. Therefore, detailed and scientifically selected to meet the printing ink of the crosslinking agent customer requirements is necessary.
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