1. carefully selected dyes
Copper, chromium and nickel metal complex dyes was constructed using a specific dyes and metal complexing to metal complex dyes made in advance. Acid metal complex dye, 93. EU rules: when related to when it is used to dye, after the use of each of those metal complex dyes, dye was discharged to the wastewater processing should be less than 7%, namely metal complex dye uptake rate to surpass 93%; Meanwhile, should not exceed 75ms/KS fiber copper or nickel, chromium should not beyond 50m ore KS fibers. Thus, selected dyes need a certain amount of purity.
2. dyeing water
Acid dyes for dyeing water hardness it is best to 100-150 mg/kg if the water hardness is high, you may add 0. 5-2s/L chelating agents to improve water quality, ensure that the dye. Phosphates and surfactants, chelating agents, will undermine the dye itself links to different degrees, affect the color brightness and color fastness. Found that Macao (the ORTHO) chelating chemical limited supply of 88, little effect on the contact of metal ion dye guessed. Thus, staining the need for filtering chelating agents, not to blindly use.
3. the way
Because the solubility of acid complex dyes is inconsistent, so when you want to make a difference. Usually tune into a paste with cold water and then diluted with hot or boiling water to make it dissolve. Sometimes for commercial dyeing guess plus filler, dissolve tough and, if necessary, be cooked, stirring until fully dissolved, writes the final screen slow tank, avoid colour spot (spot).
4. textile pretreatment
Because there is grease, pastes, impurities in fabrics and natural color. Sometimes as long as removal of slurry, and pass the half bleached, ability to dye. Practice has proved that pure textile pretreatment is relatively simple, and the blend of textiles difficult, but before dyeing it is necessary to have outstanding soaked (wet), depending on the detail depending on the species.
5. the role of acid
Both sulfuric acid, formic acid (formic acid) and acetic acid, which are acidic and acid complex dye accelerant. Sometimes in order to make the dye to dye (exhaustion), usually appended to the dyeing and later acid dosage. But when the additional required prior dilution, close the steam valve, stop heating, slowly adding people to prevent dye flowers.
6. the role of Glauber
Sometimes acid complexing dyes dyeing the desired pH value below 4, sodium sulfate as a retarding agent. Conversely, if the dye bath PH value of medium is more than 4, you should not use Glauber, because it can add dye aggregation tendency and should use non-ionic surfactants, such as flat with emulsifier OP and o for retarding agents. Depending on the dosage should be based on color depth, dyeing equipment. Excessive amount of sheep blankets, feel rough, effect of liquid dyes, liquid flow bubbles add on, and affect the normal operation of circular Exchange system; less wrong.
7. the neutralization
Alkali is mainly used for dyeing and processing in the strong acid media, intention is the result of dyeing is now ionized amino recovery for non-ionized amino-, further contact keeps the fibers and dyes. According to resolution and pollutants before the actual pH value in. Usually ammonia as lmL/L, soda ash 2-3S/L, at a temperature of 40-50 when 20-30min, and end, and abundant water.
8. the stain stops, cylinder washing temperature should not be too low, and should normally be controlled at 50-60, mainly to avoid wrinkle, particularly wool and nylon as soon as wrinkles, it will be difficult to amend.
9. fixing agent
To request higher fabric for color fastness, acid complexing dyes can be used after cationic fixing agent (powder) 2%-6% (OWF), liquor ratio 1:20-30, temperature of 55 t, dipping 30 min. Especially silk fabric, after solid-color, usually color fastness to advance 0. 5-1. 5 levels. Experiment shows that nylon fabrics do not have solid-color processing.