Old woolen yarn fast recycling method

Abstract

The present invention discloses an old woolen yarn fast recycling method. The method comprises the following steps of 1 ) alkali swelling, wherein old woolen yarns are immersed into a sodium hydroxideaqueous solution, low-speed low-temperature stirring is performed, and ethanol is dropwise added; 2) semi-extrusion drying, wherein fast high-temperature extrusion is performed to obtain a semi-dry old woolen fabric; 3) modified fiber soaking, wherein alternately soaking is performed in a modified fiber solution and a sodium hydroxide mixed solution to obtain a modified old woolen fabric; 4) decolorization and bleaching, wherein sequentially soaking is performed in a potassium permanganate aqueous solution, tap water and oxalic acid water to obtain a bleached old woolen yarn fabric; 5) dyeingand finishing, wherein dip-dyeing is performed in a softener solution and rinsing is performed with clear water to obtain a dyed old woolen fabric; and 6) washing and airing, wherein sequentially soaking is performed in a detergent, hot water and an acetic acid aqueous solution, rinsing is performed with clear water, wrapping is performed with a plastic bag, and air heating and extrusion are alternated to obtain modified woolen yarns. A process is simple, a formula is effective and cheap, the old woolen yarns and the fabrics thereof can be effectively improved in softness, color, mechanical strength and the like, and recycling of the woolen yarns is realized.

Description

technical field [0001] The invention relates to the technical field of recycling cotton wool, in particular to a method for quickly recycling old wool. Background technique [0002] Worn or damaged woolen fabrics, old woolen yarns overstocked in textile workshops, and textile wastes are often treated roughly as ordinary cotton yarns, and their downstream is generally used in the paper industry. Currently, the processing cost is relatively high, and papermaking The digestion capacity of the industry is limited, causing a large amount of old wool to be shelved and deteriorated or burned as waste products, which does not meet the green environmental protection requirements of modern production. [0003] The difficulty in recycling old wool lies in the fact that old wool is dirty, stained with various bacteria and dyes, and of poor quality. During the process of sterilization, cleaning, decolorization and dyeing, the fabric structure of old wool is basically completely destroyed...

AI Technical Summary

Problems solved by technology

[0002] Worn or damaged woolen fabrics, old woolen yarns overstocked in textile workshops, and textile wastes are often treated roughly as ordinary cotton yarns, and their downstream is generally used in the paper industry. Currently, the processing cost is relatively high, and papermaking The digestion capacity of the industry is limited, causing a large amount of old wool to be shelved and deteriorated or burned as waste products, which does not meet the green environmental protection requirements of modern production

[0003] The difficulty in recycling old wool lies in the fact that old wool is dirty, stained with various bacteria and dyes, and of poor quality. During the process of sterilization, cleaning, decolorization and dyeing, the fabric structure of old wool is basically completely destroyed. Even if it is cleaned, it can only be used as a low-quality cellulose powder product. Therefore, in order to realize the recycling of old wool and directly apply it in the textile field, it is necessary to improve the treatment process. The recovery of the existing common wool treatment process Wool yarn still does not meet the technical requirements of the textile industry