Influence Of Fenton Process On Anti Felting Of Wool Fabric

use Fenton reagent method The oxidation treatment of wool fiber scale was compared with conventional oxidation methods such as hydrogen peroxide pretreatment and protease treatment, and the influence of Fenton reagent method on anti felting and dyeing properties of wool fabric was discussed. In addition, the effects of C12H25NaO4S, Fe2+, biological enzymes and chelating agent EDTA on the color difference of fabrics were also discussed Δ E. The surface state of treated wool scale was observed by SEM, and the felting shrinkage, color difference and breaking strength of wool fabric were tested. The results show that Fenton reagent method has stronger oxidation effect on wool scale than conventional oxidation method, and has significant anti felting effect on wool fabric, which can significantly improve the dye uptake of the fabric. The breaking strength loss rate of the fabric is 8.4%, which will not affect its serviceability.

Wool is a kind of pure natural protein fiber, which is composed of scale layer, cortex layer and medulla layer. The existence of wool scale layer and its own elastic characteristics are the main reasons for felting of wool fabrics. At present, the main method to prevent felting is to change the scale layer.

The traditional method of wool fabric treatment is mostly using chlorine containing oxidants to passivate the scale layer, but the AOX produced is very harmful to the environment. With the strengthening of environmental awareness, the harm of AOX to the environment has attracted great attention. Research on new clean and less polluting finishing agents and their treatment methods to replace the traditional chlorination method has become a research hotspot of wool anti felting.

Many scholars at home and abroad, out of consideration of environmental protection, mostly choose H2O2 as pretreatment agent, supplemented by protease treatment for anti felting processing of wool fabrics. Although H2O2 method and biological enzyme method have made some progress in wool shrink prevention and solved the problem of environmental pollution, there are still some problems in wool scale treatment with this method, such as longer treatment time and less obvious treatment effect.

This paper uses Fenton reagent method to Wool fibre And try to solve the existing problems. Fenton reagent is a mixed solution composed of H2O2 and Fe2+. Due to its strong oxidation capacity, it is widely used in environmental protection and chemical reaction process fields. H2O2 decomposes to produce · OH under the catalysis of Fe2+. Its oxidation potential is the strongest inorganic oxidant except element fluorine. It oxidizes and decomposes organics through electron transfer and other ways. As a catalyst, Fe2+is finally oxidized to Fe3+[4-6].

Materials. Wool top, pure wool fabric (commercially available), sodium dodecyl sulfate (C12H25NaO4S) (reagent grade, Shenyang No. 5 Reagent Factory) FeSO4 · 7H2O (reagent grade, Tianjin Kemio Chemical Reagent Development Center), H2O2 (35%), acid protease (pH 2.5~5.0, suitable temperature 30~45 ℃, Zhaodong Nicheng Enzyme Preparation Co., Ltd.) chelating agent EDTA (reagent grade, Shenyang Federal Reagent Factory), Non ionic defoamer (Dalian Xinyuan Chemical Technology Co., Ltd.), acetic acid, weak acid turquoise blue A-G. Equipment and instruments. Electronic balance, oven, YG065 fabric strength tester, infrared dyeing small prototype (Guangdong Hongda Machinery Co., Ltd.), LV-646 scanning electron microscope (Japan JEOL Company), ADCI-60 full-automatic color difference meter (Beijing Chentaike Instrument Technology Co., Ltd. ADCI-60-C), HH series thermostatic water bath.

Experimental method and process. Fenton method treatment: wool tops and fabrics are treated with sodium dodecyl sulfate (C12H25NaO4S), mass concentration 1g/L, bath ratio 1:40, temperature 40 ℃, 30min, and dried. Then treat with FeSO4 · 7H2, the mass concentration is 0.1g/L, the pH value is less than 3, the bath ratio is 1:40, the temperature is 40 ℃, 30min, and dry. Then 50g/LH2O2 (35%), bath ratio 1:40, temperature 70 ℃, 60min, water washing, drying. Finally, use 1g/L chelating agent EDTA, pH<6, bath ratio 1:40, temperature 80 ℃, 20min, water washing, drying.

Fenton protease treatment: Fenton process Conduct treatment, and then treat with acid protease. The dosage of protease is 3% (owf), pH value is 3, bath ratio is 1:40, temperature is 40 ℃, 60min. H2O2 (35%) treatment: mass concentration 50g/L, bath ratio 1:40, temperature 70 ℃, 60min. Protease treatment: acid protease dosage 3% (owf), pH 3, bath ratio 1:40, temperature 40 ℃, 60min. H2O2 protease treatment: wool tops and wool fabrics are treated with H2O2 and protease treatment process. Fabric dyeing process: the amount of weak acid turquoise blue is 2% (owf), the amount of acid dye leveling agent is 1% (owf), the bath ratio is 1:40, the pH value is adjusted to 4~6, 50 ℃ is used for dyeing, the temperature is raised to 80 ℃, and the dyeing lasts for 20 minutes.