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Inspection Of Basic Safety Items For Eco Textiles And Textile Products (4)

2010/11/15 14:54:00 42

4.3 banned azo dyes

Textiles and garments

After the use of azo dyes containing carcinogenic aromatic amines, the dye may be absorbed by the skin in the long-term contact with the human body (which is more likely to occur in poor color fastness) and spread in the human body.

These dyes may decompose and restore in the human body and release some aromatic carcinogenic amines.

The metabolism of these aromatic amines in vivo makes cell deoxyribonucleic acid (DNA) change, which is the inducement of human diseases and has potential carcinogenic sensitization.

As early as 1930s, when Japanese Yoshida discovered that solvent yellow could cause liver cancer in rats, people began to realize the danger of azo dyes and their intermediates in production and use.

In fact, in 1905, the German health authorities confirmed the carcinogenic effect of some aromatic amines from dyed fuchsin, gold amine and naphthalene.

With the rapid development of dyestuff and chemical industry, this situation has further deteriorated. According to incomplete statistics, by 1960s, more than 3000 cases of bladder cancer in the world were engaged in dyestuff and chemical industry.

In 1994, the German government issued a decree prohibiting the use of 118 azo dyes capable of producing 20 kinds of harmful aromatic amines.

European Union

In 1997, the 67/648/EC directive was issued by the European Union to prohibit the use of azo dyes which can lyse and release some carcinogenic aromatic amines in textiles and leather products. There are 22 carcinogenic aromatic amines.

In March 27, 2001, the EU issued the 2001/C96E/18 directive, which further specified the textiles contained in the control area.

The directive also provides for the detection of 3 banned dyes. The detection rate of carcinogenic aromatic amines should not exceed 30 mg/kg.

In July 19, 2002, the European Union issued the order No. 2002/61, indicating that all azo dyes released from carcinogenic aromatic amines under reduction conditions were banned.

In January 6, 2003, the EU further issued the directive No. third of 2003, which stipulates that

European Union

Banned and sold chromic azo dyes in the textile, clothing and leather products market and came into effect in June 30, 2004.

4.4 color fastness test and odor test

Analysis of Oeko-Tex 200 (test standard) detection procedures can be seen in the assessment items, in addition to color fastness and odor, other assessment items are basically toxic and harmful substances restrictions.

Why do we need to check the color fastness and smell? This is because the fastness is closely related to the two categories of assessment indicators, such as banned dyes and extractable heavy metals. When the color fastness is not good, if the banned dyes and extractable heavy metals exist, the textile will cause greater harm to the human body.

At present, the color fastness items of GB 18401 standard are water resistant (discoloration, stain), acid perspiration (discoloration, stain), alkali resistance (stain, stain), dry friction, saliva resistance (stain, stain) and so on.

The presence of odors can directly lead to a decline in the wearability of textiles. Any odors that are not related to the product or related to the products, but excessive odour indicate that there are excessive chemical residues on the textiles, which may cause potential health hazards.

At present, the odor tested by GB 18401 standard has musty flavor, high boiling oil smell, fishy smell, aromatic hydrocarbon smell and so on.