A solvent dye is soluble in organic solvents. It is usually used as a solution in an organic solvent. It is used to color organic solvents, hydrocarbon fuels, waxes, lubricants, plastics, and other hydrocarbon-based nonpolar materials. Fuel dyes are one use of solvent dyes. Their molecules are typically nonpolar or little polar, and they do not undergo ionization. They are insoluble in water. They form a colloidal solution in solvents.They have poor (basic dyes) to good (metal complex based) light fastness. It is used for gold imitation (and other transparent metallic effects) of metallized polyester films. Also used in marking inks, inkjet inks, glass coloration, and so on.
Pay attention to the reducibility of blue anthrone dyes
Blue anthrone reducing dyes include reduced blue RSN, GCD, BC, etc. their chemical structure is prone to over reduction, that is, four carbonyls are reduced to ona group, so it is necessary to use glucose, dextrin and other over reduction preventers in dyeing. In addition, the use of excessive powder will lead to the over reduction of blue anthrone reducing dyes, not only the color of the dye will become dark green, in extreme cases, it will even partially fade and reduce the concentration.
Oxidants used and oxidation conditions
The commonly used oxidants are hydrogen peroxide, sodium perborate, etc. When hydrogen peroxide is used, there are two oxidation conditions: one is to oxidize at 50-60 ℃ with 35% h2o22-3ml / L, the other is to oxidize at 50-60 ℃ with 35% h2o22-3ml / L, and add 35% h2o22-3ml / L after heating up; when sodium perborate is used, the oxidation condition is to oxidize at 60 ℃ with 2-3g / L sodium perborate, which has stable effect under alkaline condition. In addition, 3-5g / L of sodium m-nitrobenzenesulfonate, an organic oxidant with excellent sustained effect, is also effective for oxidation at 40-50 ℃.
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