Does the textile direct injection machine cause pollution problems?

by:angelacrox     2021-08-20
The important substances contained in the exhaust gas produced during the production process of the textile direct injection machine and their sources of production are related to: (1) Mineral oil production sources: kerosene, paste-like synthetic thickeners, softeners, defoamers; (2) ) Formaldehyde generation source: adhesive, fixing agent, preservative; (3) Monomer generation source: adhesive, fixing agent, thickener; (4) Smoke generation source: paste synthetic thickener, softener , Urea, ethylene glycol; (5) Sources of volatile organic compounds: kerosene, paste-like synthetic thickeners, softeners, defoamers, ethylene glycol. Due to the higher and higher fastness requirements for textile direct-injection woven fabrics, many foreign adhesives are still using low-formaldehyde melamine resin fixing agents, and the self-crosslinking of adhesives produced by most domestic enterprises The body also still uses n-methylol acrylamide (accounting for 3% to 5% of the total monomer), which releases free formaldehyde during the baking and storage process, making it difficult to ensure the free formaldehyde content on the printed fabric Below the detection limit, most of the reducing agents used for discharge printing contain formaldehyde, so this is a problem that needs to be solved urgently. Toxicological problems of printing color paste: Textile direct injection machine color paste is made of pigments, dispersants, surfactants (emulsifiers and wetting agents) and water through high-speed pre-dispersion and then high-shear mechanical grinding. The pigment paste, except for black (carbon black) and white (titanium dioxide), the other chromatograms are all organic pigments. According to the chemical structure, they are divided into azo type, heterocyclic type and phthalocyanine structure. Among them, azo Most of the pigments are yellow, orange, and red. Heterocyclic pigments are mainly red and purple, while the pigments with phthalocyanine structure are blue and green pigments. The banned carcinogenic aromatic amines are most affected by azo pigments. There are three main carcinogenic aromatic amines involved, namely 3, 3'-chlorobenzidine (dcb), 3, 3'-dimethylbenzidine (dmb) and 2 —Methyl-5-nitroaniline (Big Red g Peisi), which is related to 21 different brands of products such as yellow, orange, red, purple, and brown in China. At present, organic pigments made of 3.3′-dichlorobenzidine and 3.3′-dimethylbenzidine have been proved to be unable to detect carcinogenic aromatic amines produced by endogenous metabolic cleavage under standard testing conditions, so no tumors will be generated. The activity is not carcinogenic. However, the study found that if an excessive, strong alkaline mixture of methanol and ammonia is used for testing under harsher conditions than the standard testing method, some azo pigments made with 3.3′-dichlorobenzidine can be found It will still crack to produce carcinogenic aromatic amines that exceed the limit value. And this cracking is not only related to the pigment structure, but also related to the application method and the quality of printing and dyeing, including the binder system used, the color depth, and the fabric. In the post-quota era, with the accelerating process of international market integration, relying solely on stable and first-class product quality is not enough to enable enterprises to enter the broad international market smoothly. In order to integrate with the international market as soon as possible, this requires the textile direct injection machine industry to pay attention to the ecological requirements during production and processing, as well as the toxicological problems of textiles to the human body.
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