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Anonymous users2024-02-15Good afternoon, common water-soluble acid dyes, basic dyes, direct dyes, and disperse dyes all belong to the azo dye range, please refer to it. Azo dyes are only azo groups (-n=n-) in the molecular formula as color groups, and some aniline dyes containing azo groups are both azo dyes and aniline dyes.
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Anonymous users2024-02-14Many, I know of methyl orange, methyl red, acid red, Sudan dye, these dyes all contain azo bonds
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Anonymous users2024-02-13Azo dyes include acidic, basic, direct, mordant, ice-dyed, dispersed, reactive dyes, and organic pigments. According to the number of azo groups contained in the molecule, it can be divided into monoazo, diazo, triazo and polyazo dyes: monoazo dyes:
ar-n=n-ar-oh(nh2) diazo dye: ar1-n=n-ar2-n=n-ar3 triazo dye: ar1-n=n-ar2-n=n-ar3-n=n-ar4 where ar is aryl.
As the azo base order increases, the color of the dye deepens.
1859 J, pGris discovered the first diazo compound and prepared the first azo dye---aniline yellow.
Sudan dyes are a class of synthetic azo dyes, and their varieties mainly include Sudan 1, Sudan 2, Sudan 3 and Sudan 4, which are mainly used for solvents, oils, waxes, gasoline and shoes and floors.
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Anonymous users2024-02-12The largest variety of man-made dyes is azo dyes. The rise of the modern oil and coal industries has brought a large amount of benzene, toluene, and paraben.
Naphthracene, etc. So, to benzene ring.
The center's chemical research is flourishing. In azo dyes, the molecule contains 2, 4, or 6 nitrogen atoms linked by double bonds, all of which are even numbered.
Therefore, it is called azo dye. Azo dyes have 7 colors: red, orange, yellow, green, cyan, blue, and violet, from light to dark. For example, the red ones are Congo red and do not fade red; The yellow ones are tartar yellow, aniline yellow renting rock; The blue ones are cyclic emerald blue, phenol blue-black; the cyan has indigo dye; The purple ones are Tyre purple, Vidoa purple, and so on.
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Anonymous users2024-02-11The European Union has published 3 European standards on test methods for harmful azo dyes in its official publication. These standards are companion documents for the implementation of EU Directive 2002 61 EC.
They are: 1: Ceniso TS17234:2003 leather - chemical test - check whether the dyed leather contains a certain type of azo dye.
2:EN14362-1:2003 Textiles - Detection of aromatic amines released from azo dyes - Part I: Testing products for the presence of certain types of azo dyes without extraction.
3: EN14362-2: 2003 Textiles – Testing of aromatic amines released from azo dyes – Part 2: Extraction of fibers to test whether a product contains a certain type of azo dye.
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Anonymous users2024-02-10Insoluble in water, the diazo component is the diazo salt of some aromatic primary amines, and the coupling component is mainly phenolic compounds.
Hello! Whether the materials used in the dyeing factory contain azo dyes or not is not to write a certificate yourself. Instead, the dyes of your factory should be sent to a third-party testing agency for actual testing, and whether the test is qualified or not will be reflected in the test report of the third-party testing agency. >>>More
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