氧化脱胶体系对亚麻纤维理化性能的影响.

Linen products are widely used in clothing home textiles and industrial textiles and are favored in the textile market for their excellent properties such as good moisture permeability antibacterial and anti-radiation properties. The key to improve the spinnability of flax raw materials and the quality of finished products lies in degumming and extracting high-quality hemp fibers. Traditional chemical degumming methods of flax involve complicated steps long production process and high labor intensity which is no longer in line with the current trend of efficient production in factories. The research and development of efficient and energy-saving oxidative degumming has attracted wide attention of researchers. In recent years degumming flax fibers with various oxidant systems has become a research hotspot. The main principle of oxidation and degumming is to use oxidizer to quickly degrade the colloid and complete the bleaching at the same time which can simplify the cooking-bleaching process in the traditional de-bonding process. At present alkaline hydrogen peroxide is the most commonly used flax oxidation degumming system sodium percarbonate is often used as bleach and dyeing agent in the textile industry while the TEMPO system and the NHPI system are more frequently used for selective oxidation of plant cellulose to prepare fibers with high carboxyl content of high added value. However no related application in degumming of hemp fibers has been reported. At the same time the differences of physical and chemical properties of the four oxidation systems have not been systematically studied. The four oxidation systems of alkaline hydrogen peroxide sodium percarbonate TEMPO system and NHPI system were used in this study. The results show that all the four oxidation systems can successfully realize the degumming of flax fibers. Compared with primary flax the collagen content of flax fiber lignin and pectin decreases significantly the change of polymerization and bundle fiber strength varies greatly and the fiber fineness and whiteness are greatly improved. Specifically in terms of the NHPI system the fiber polymerization degree is 572 the bundle fiber strength is 24.41 cN / tex and the pectin content is 1.67% and its fiber tensile performance is poor and the residual pectin content is high. As for the TEMPO system the fiber fineness is 8. 33 dtex the degree of aggregation is 1 086 the lignin content is 1.62% and the fiber fineness is satisfactory. However the residual lignin content is relatively high and the polymerization degree is relatively low. As regards the sodium supercarbonate system the fiber polymerization degree is 2 315 the beam line dimension strength is 63. 09 cN / tex the lignin content is 1.74% and the pectin content is 1.58% . Its fiber strength and elongation performance is satisfactory while the gum content of residual lignin and residual pectin is relatively high. As for the alkaline hydrogen peroxide system the fiber whiteness is 60. 6 the lignin content is 1. 29% and the pectin content is 1.09% . It has the lowest fibrous pectin content. By exploring the differences in the physical and chemical properties of flax fibers under the four oxidation degumming systems this paper provides a new idea for the selection of the oxidation system in the flax degumming process. [ABSTRACT FROM AUTHOR]