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What Are The Main Factors Affecting The Impact Of Organic Pigments In Impurities?

(1) trace of aromatic amines: the production of organic pigments, inevitably there will be trace amounts of aromatic amines, national regulations have a corresponding limit on the provisions of the provisions, such as food packaging materials, the aromatic amine content of the pigment can not exceed 500ppm , For some diazo class will break down into carcinogenic MAK-ⅢA aromatic amine azo pigments, should pay attention to its toxicity.

(2) trace of heavy metals: As early as 1973, the United States Dyestuff Production Association (DCMA) on the US market of commercial pigments of heavy metals for a comprehensive test and research, indicating that the pigment heavy metal content is very low, in line with legal standards The

(3) Polychlorinated biphenyls (PCBs): Very restrictive restrictions on PCBs in the United States and the European Union, because these compounds are highly distributed and endangered, and the typical two- Dairy market panic, trace PCB mainly exists in two pigments, namely: azo pigments (including chloroaniline, dichloro or tetrachlorobenzidine), the use of dichlorobenzene or trichlorobenzene as solvent for organic pigments , Which can produce trace amounts of PCB by side reactions.

In summary, under normal conditions, organic pigments have no acute toxicity and repeated exposure to the living body after the toxicity, there is no obvious mutagenicity and carcinogenicity, including 3,3'-dichlorobenzidine as heavy Nitrogen components produced by azo-type organic pigments, therefore, the German government promulgated on July 15, 1994 for the use of colorants only dyes, no organic pigments, apparently taking into account the organic pigment made of paint printing paste or paint stains The use of textiles for coloring is also safe and does not break down azo bonds under special conditions to break out harmful aromatic amines, but as organic pigments, added components or additives must be noted because the tests found that they often Will play a role in the toxicity of organic pigments; the manufacture of organic pigments of raw materials should also be strictly controlled, can not be harmful to the human body aromatic amine.

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