Method for bleaching grey down feather

Abstract

The invention discloses a method for bleaching grey down feather. The method comprises the following steps: firstly, using ferrous ions to conduct pretreatment on down feather to be treated, then conducting selective oxidation bleaching on the down feather, and finally using thiourea dioxide to conduct reduction bleaching on the down feather, and using clear water to wash the down feather, and drying. The method can effectively eliminate the natural pigment in the down feather, and has less damage to the down feather; the selective oxidation bleaching and reduction bleaching by using the thiourea dioxide (TDO) are combined to treat the down feather; after the TDO is applied to conduct reduction bleaching under the mild condition on the down feather treated by selective oxidation bleaching, thus improving the whiteness of the down feather, leading the decolorization and bleaching of the grey down feather to achieve high-level whiteness, and inhibiting the color reversion of the down feather; and the TDO is an acid reducing agent, can play the role of strong reducing property under the acidulous and neutral conditions, is suitable for the stability condition of the protein fiber in the down feather, and has little damage to the fiber. The whole process for decolorizing and bleaching the down feather is conducted at low temperature, thus not only ensuring the little damage to the fiber, and good bulkiness, but also being beneficial to energy conservation and environmental protection.

Description

technical field [0001] The present invention relates to down bleaching technology, in particular to a gray down bleaching method. Background technique [0002] Feather and down are natural protein fibers. Feather and down textiles are soft, fluffy and have excellent thermal performance. The products are deeply loved by consumers. Down and feathers can be used as filling materials for sporting goods, handicrafts, clothing and bedding, and as raw materials for animal-derived protein feed. They have important economic value, and they are used as filling materials for clothing and bedding. [0003] my country is the world's largest producer and exporter of down and its products. In 2006, all feather (down) processing and product manufacturing enterprises in China realized a total industrial output value of 32,287,666,000 yuan. The export of down and feather has a history of more than 100 years, and the export volume has occupied more than 70% of the world's down market. Accord...

AI Technical Summary

Problems solved by technology

h 2 o 2 Although good bleaching effect can be achieved as an oxidizing agent, higher pH medium, higher water bath temperature and longer oxidation time are required in the bleaching process, the production cost is greatly increased, and the profit generated is small, which is not conducive to industrialization Production

Moreover, if only H 2 o 2 Oxidative bleaching as an oxidant, the bleaching process is difficult to control, and it is easy to cause over-oxidation or incomplete oxidation, so it is easy to cause the feathers to become brittle, easy to crush, and yellow after bleaching, and after a period of time, usually about three months , the bleached down part returns color, which seriously affects the performance of the bleached down