Fabric pre-treatment: adopting environmentally friendly technology is the inevitable development direction
Editor’s note: REACH, the Registration, Evaluation and Authorization and Restriction of Chemicals, was officially implemented on June 1 this year, and pre-registration began on June 1, 2008. According to the requirements of this new system, the EU will complete the registration, evaluation and recognition of all relevant chemicals in stages by 2012. During the legislative process, a motion to mark “This product complies with REACH requirements” on products was also introduced. For the printing and dyeing industry, if products want to enter the EU market, the dyeing materials used in printing and dyeing processing should be selected, and corresponding process technologies should be adopted according to the requirements of REACH. The principle of dyeing and finishing technology in response to REACH should be to minimize the amount of stains on the fabric. Chemical content, avoid using dyes containing SVHC, and try to use APEO-free pre-treatment and soft finishing, halogen-free bleaching, environmentally friendly dyeing, PFOS/PFOA-free functional finishing and other process technologies.
In view of REACH regulations, the pre-treatment process should highlight three points: first, use environmentally friendly additives and adopt environmentally friendly production processes (APEO-free pre-treatment, halogen-free bleaching, etc.); second, use enzyme treatment as much as possible; third, Pay attention to the washing of residual additives on the fabric, especially the washing after mercerization.
In addition to paying attention to the pH value of the finished product during fabric pre-treatment, efforts should also be made to reduce residual additives on the fabric. EU 2002/371/EC stipulates that the use of 7 surfactants and their preparations including alkylphenol polyoxyethylene ether (APEO) is restricted. 2003/53/EC stipulates that textiles and clothing entering the EU must provide valid proof of APEO testing. The allowable limit of APEO in chemicals is <0.1% (1000mg/kg). APEO is widely used in the production of various scouring agents and detergents in my country, such as detergent 105, detergent LD, 826 detergent, 1050 detergent, surfactant 812, etc. The banned EDTA and DTPA are used in the manufacture of oxygen bleach stabilizers, such as hydrogen peroxide stabilizer C-75. The detergent LS also contains carcinogenic aromatic amine anthranilate. This is the only dyeing and finishing auxiliary found to contain carcinogenic aromatic amines in production and use so far. This is caused by the transformation of its production raw materials. To.
For pretreatment additives that do not contain harmful chemicals such as the seven restricted surfactants, alternatives can be found in my country, such as environmentally friendly scouring agent ZS-95, scouring agent KC301, chelating agent S, Hydrogen peroxide stabilizer CJ201, etc. Scouring agent ZS-95 is a high-performance low-foam scouring agent for cotton fabrics. It can be completely degraded within 48 hours. It can withstand alkali to 150g/l. It does not contain APEO and phosphorus. It is suitable for alkali-oxygen one-bath cold bleaching process and steaming. Process and short process pre-treatment. Hydrogen peroxide stabilizer CJ201 is composed of a copolymer of sugar compounds and carboxylic acid compounds. It has excellent chelating properties, biodegradability, alkali resistance and large activation energy, and does not decompose within 100°C. Practice has shown that by using pre-treatment additives containing APEO and applying traditional continuous dyeing and finishing processes, as long as APEO-free additives (such as softeners, etc.) are used in post-printing and dyeing finishing, the APEO content in finished printed and dyed products is generally lower than 100 mg/kg, although this meets the EU’s restriction requirements, it still has to fulfill the obligation to notify consumers. The application of APEO-free pre-treatment process is the inevitable development directionAA
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