6． What is MAK? What is the relationship between MAK IIIA and A2 and the 22 banned aromatic amine dyes and auxiliaries?
Answer: The German MAK Committee is an organization that formulates classifications and limits for high acceptable concentrations of carcinogens and hazardous substances. Announcement No. 30 points out that a total of 22 substances in Category III A1 and A2 are direct or indirect carcinogens and are designated as banned substances (MAK originally meant to be approved for large concentrations). , the original text is Maxium Artbeiplay Kongentrations). Dyes containing MAKⅢA1A2 aromatic amines are prohibited, and additives are also affected by individual carcinogenic aromatic amines. For example, detergent Ls is used during the manufacturing process One of the raw materials used is para-aminomethyl ether, which is an isomer of anthranilic amine and is a carcinogenic aromatic amine. In addition, polyurethane PU coating agent layer p polyurethane is a polymer elastomer composed of hard segments and soft segments. The hard segment is composed of diisocyanate. Commonly used diisocyanates include TDI (2,4 or 2,6-toluene diisocyanate), MDI (4,4′-diphenylmethane isocyanate), etc., among which TDi and MDl are represented by 2,4 respectively. – Diaminotoluene and 4,4-diaminodimethane are used as raw materials. Through the complete gas reaction, the amino group is converted into isocyanate. The residual amount of this type of diamine in the PU coating agent can be as high as 1300 mg/kg. This aromatic amine is included in the list. MAKⅢA2 group. In addition, high-temperature leveling agents made of styrene phenol polyoxyethylene ether and carriers containing biphenyl chloride and chlorinated hydrocarbons are all carcinogens.
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