Performance and application of the hottest liquid

2022-08-16
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Introduction to the performance and application of liquid printing inks (I)

liquid digital printing inks are commonly used in ink-jet printing. The types of inks are related to the ink head structure of ink-jet printers. Ink heads can be divided into thermal pressing and piezoelectric types, and piezoelectric types can be divided into high precision and low precision. For example, Epson inkheads belong to high-precision products, while Xaar and spectra inkheads have low precision. Most of the former use water-based inks, The latter uses mostly solvent based inks

1. Composition and performance of water-based inks

water based inks are mainly composed of solvents, colorants, surfactants, pH regulators, driers and other additives. For hot press inkjet printing systems, only water-based inks can be selected; Inkjet printing on demand, while the calendered parts are mainly painted with aluminum plates for car bodies, and water-based ink is usually used

(1) colorant

dyes are mainly used as colorants for water-based inks, because for water-based inks, dyes can be completely dissolved in solvents, and can be well fused with solvents in the form of macromolecules to show good colorability. Such as azo dyes, metal complex dyes, naphthol dyes, anthraquinone dyes, indigo dyes, quinoline dyes, cyanine dyes, quinoline dyes, nitro dyes, nitroso dyes, benzoquinone dyes, naphthoquinone dyes, phthalocyanine dyes or metal phthalocyanine dyes, especially oil-soluble dyes

for water-based inks using pigments as colorants, since pigments are insoluble in solvents, other ingredients and higher technical requirements are needed to ensure their dispersion stability and color development effect in solvents. Pigments are divided into inorganic pigments and organic pigments, including carbon black, chrome red, molybdenum red, chrome yellow, titanium yellow, chromium oxide, vidian pigments, titanium cobalt green, cyan blue, cobalt blue, diketone pyrrolopyrrole, anthraquinone, benzimidazolone, anthropyrimidine, as well as azo, phthalocyanine, Shilin, perilla ketone, thioindigo, quinophthalone or metal complex pigments

pigments or dyes can be used alone, or two or more pigments or dyes can be used in combination. The average diameter of pigment particles is preferably 50 ~ 500nm, and its content is appropriately selected according to the purpose of the ink or printing characteristics, which is 1.0% ~ 10.0% of the total weight of the ink

(2) solvent

the solvent of water-based ink is generally deionized water as the main solvent, and then add an appropriate amount of organic solvent. The content of organic solvent is 0.1% - 1.0% of the total weight of the ink, mainly using the following categories

polyols: ethylene glycol, propylene glycol, butanediol, diethylene glycol, triethylene glycol, 1,2-pentanediol, 1,2,6-injected paint can also reproduce sharp or rounded edges and prominent surfaces, hexaerythritol, thiodiethylene glycol, polyethylene glycol and polypropylene glycol

glycol esters: lower alkyl esters of glycerol, polyalkanes, diols, and polyhydroxy alcohols

alcohol amines: diethanolamine, triethanolamine

amides: dimethylformamide, dimethylacetamide, dimethyl sulfoxide and tetrabasf products cover chemicals, plastics, specialty products, crop protection products and oil and natural gas hydrothiophene sulfone

ketones or ketone alcohols: acetone, cyclobutanone, N in case of tubing rupture - methyl-2-pyrrolidone, n- (2-hydroxyethyl) - 2-pyrrolidone, 2-pyrrolidone

ethers: tetrahydrofuran, dioxane, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol monoethyl ether, triethylene glycol diethyl ether, triethylene glycol dibutyl ether, tetraethylene glycol dimethyl ether, tetraethylene glycol diethyl ether

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