Dyeing factory does not contain azo dyes how to write a certificate

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.

Or ask your dye supplier to provide an environmental report on azo testing from a third-party testing agency.

HCT iridescent detection, we will answer for you.

AZO azo compounds are compounds formed by the attachment of azo group-n=n- to two hydrocarbon groups, and its general formula is r-n=n-r. The nouns related to azo azo compounds in life are: azo free, azo free certificate, azo free test, azo fuel, azo dye, etc.

The materials involved in azo synthesis mainly include: cloth, leather, paint, plastic, rubber, colorants, etc.

The twenty-four carcinogenic aromatic amine dyes currently banned in the EU include:

Aminobiphenyls. 2. Benzidine.

Chloro-2-methylaniline.

Naphthylamine. - Amino-3,2'-dimethylazobenzene.

Amino-4-nitrotoluene, 4-dihydromethyl ether.

Chloroaniline, 4'-Diaminodiphenylmethane, 3'-Dichlorobenzidine, 3'-Dimethoxybenzidine, 3'-Dimethylbenzidine, 3'-Dimethyl-4,4'-Diaminodiphenylmethane.

Methoxy-5-methylaniline, 4'-methylene-bis(2-chloroaniline), 4'-diaminodiphenyl ether, 4'-diaminodiphenyl sulfide.

Methylaniline, 4-dihydrotoluene, 4,5-trimethylaniline.

Methoxyaniline.

Aminoazobenzene, 4-dimethylaniline, 6-dimethylaniline.

Recently, some newspapers and periodicals have frequently appeared in the article "the EU will ban the use of azo dyes", in fact, this statement is inappropriate, it should be "the EU will ban the use of harmful azo dyes", there is a lack of a definite sentence, but its content is very different.

Dyes are classified according to application, including direct dyes, acid dyes, disperse dyes, reactive dyes, cationic dyes, etc., and azo dyes, nitro dyes, sulfur dyes, anthraquinone dyes, etc. In the molecular structure of dyes, all those containing azo groups (n n) are collectively called azo dyes, in which the azo group is often connected with one or more aromatic ring systems to form a conjugated system and serve as the chromosome of the dye.

Azo dyes are widely used in textiles, leather products and other dyeing and printing, in the synthetic dyes, azo dyes are the most diverse and number of a class, accounting for more than half, the current printing and dyeing factory uses as many as 600 700 kinds of azo dyes, it is impossible to be all banned, there are many direct dyes, acid dyes, disperse dyes, reactive dyes, cationic dyes are azo dyes. Azo dyes have a wide range of chromatograms, including red, orange, yellow, blue, purple, black, etc., with complete colors, good color and light, and a certain fastness, so they are widely used in the dyeing of various fibers.

In 1994, Germany promulgated a daily decree stipulating that all leather and textiles exported to Germany must be tested for banned azo dyes (referred to as AZO testing), where "banned azo dyes" is not "prohibiting the use of all azo dyes", but "prohibiting the use of harmful azo dyes".

This test item is also one of the test items stipulated in the OEKO 100 standard (commonly known as the environmental protection standard) issued by the International Textile Ecological Research and Inspection Association, which stipulates that textiles shall not contain 23 kinds of azo dye intermediates, and if one of them is detected, it is a substandard product. After long-term contact with the human body, the clothing dyed with azo dyes will be mixed with the components released in the metabolic process and produce a reduction reaction to form carcinogenic aromatic amine compounds, which will be absorbed by the human body, and after a series of activation effects, the DNA of human cells will undergo structural and functional changes, which will become the cause of human body lesions.

The European Union is one of the markets for China's textile clothing and leather products imports, according to customs statistics, in 2001, the total value of textiles, clothing and leather products exported to the European Union exceeded 6.4 billion US dollars, accounting for about 11 of the total export value of similar commodities that year, the European Union's new regulations on the detection of prohibited azo dyes have caused great attention to China's textile industry and dye industry, and qualified substitute dyes containing harmful aromatic amine intermediates have been introduced. As long as we pay attention to the EU regulations, it will not affect the export of enterprise products. （**。

Textiles. 1 Clothing, bedding, towels, wigs, eyebrows, hats, diapers and other hygiene products, sleeping bags.

2: Shoes, gloves, watch straps, tote bags, various wallets, briefcases, chair covers.

3 Textile or leather toys, toys with textile or leather garments, synthetic dyes, organic compound dyes.

4: Fabrics and yarns that are ultimately used by consumers.

5: Decorative fabrics.

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.