Introduction of liquid ink digital printing - digital printing, liquid inks - printing special printing industry
Liquid commonly used in digital printing ink jet printing, ink jet printer Motou type and structure of, Motou can be divided into two types of hot type and the piezoelectric, piezoelectric is divided into high-precision and low accuracy, such as EPSON inkjet heads are precision products, Xaar and Spectra inkjet heads less precise, the former most of the use of water-based ink, which is mostly solvent-based inks.
1. Water-based ink composition and performance Mainly by water-based ink solvent, coloring agent, surfactant, pH value regulator, drying agents and other additives for hot inkjet printing systems, can only use water-based ink; on-demand ink jet printing ink usually use water-based ink.
(1) coloring agent Water-based ink dye colorants mainly because of the water-based ink, the dye can be completely dissolved in a solvent to form macromolecules with the solvent and show a good blend of good color. Such as azo dyes, metal complex dyes, naphthol dyes, anthraquinone dyes, indigo dyes, quinone imine dyes, cyanine dyes, quinoline dyes, nitro dyes, nitroso dyes, benzoquinone dyes, naphthoquinone dyes phthalocyanine dye, or metal phthalocyanine dye, especially preferred oil-soluble dyes.
To paint for the coloring agent for water-based ink, because the pigments do not dissolve in solvent, so to ensure their dispersion stability in solvent and hair color results will need other ingredients and higher technical requirements. Inorganic pigment into a pigment and organic pigments, including carbon black, chrome red, molybdenum red, chrome yellow, titanium yellow, chromium oxide, Weilidian pigment, titanium cobalt green, Ultramarine blue, cobalt blue, diketone pyrrole and pyrrole , anthraquinone, benzimidazole ketone, anthracene and pyrimidine, and azo, phthalocyanine, Shihlin class, perilla ketone, sulfur indigo type, quinoline phthalocyanine pigments such as ketones or metal complexes.
Pigments or dyes can be used alone, it can be more than 2 or 2 pigments or dyes used in combination, the average diameter of pigment particles is best for the 50 ~ 500nm, its content or use based ink printing features appropriate choice for the total weight of ink of 1.0% to 10.0%.
(2) solvent Solvent inks generally deionized water-based solvent, and then add the appropriate amount of organic solvent, organic solvent content of ink on the total weight of 0.1% to 1.0%, mainly in the following categories.
Multi-hydroxy alcohols: ethylene glycol, propylene glycol, butanediol, diethylene glycol, triethylene glycol, 1,2 - pentanediol, 1,2,6 - have triol, thio-2 glycol, polyethylene glycol and polypropylene glycol.
Glycol ester: glycerol, multi-agent alkane diols, polyhydric alcohols of lower alkyl ester. Alcohol Amine: diethanolamine, triethanolamine. Amide: dimethylformamide, dimethylacetamide, DMSO, and tetrahydrothiophene sulfone. Ketone or ketone alcohol: acetone, cyclobutanone, N-methyl -2 - pyrrolidone, N-(2 - hydroxyethyl) -2 - pyrrolidone, 2 - pyrrolidone.
Ethers: tetrahydrofuran, 2 alkyl, ethylene glycol monomethyl ether, ethylene glycol ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol ether alone, triethylene 2 Single alcohol ether, 3 ethylene glycol ether, triethylene glycol diethyl ether, triethylene glycol dibutyl ether, ethylene glycol dimethyl ether 4, 4 ethylene glycol diethyl ether.
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