|
Flax is a natural cellulose fiber with excellent properties, which endow its products with good wearing characteristics and style. So it meets requirements of the markets and the customers in the global textile. Flax noil fiber are the short fibers falling from the long spinning process, with good moisture absorption, heat dissipation and abrasion, small electrical conductivity, low dust, antibacterial and other unique health benefits just like flax fiber. However, the inherent shortcomings of flax noil fiber, such as the shorter length and lower length uniformity, lower splittability, higher stiffness and impurities content, and poorer cohesion, make it difficult to spin directly.In order to overcome the disadvantage of flax noil fiber, the refining technology was studied in this paper, and the optimum refining process had been got; meantime the performances of the refined flax noil fiber were tested and analyzed. The conclusions were drawn as follows:(1) Enzymatic modification of flax noil fiber needed alkali pretreatment, which could make the fibers fully infiltrated before enzymatic treatment, and removed part of the pectin and hemicelluloses so as to help the spread and adsorption of enzyme, which could speed up the reaction.(2) Researches on the process of enzymatic modification showed that the concentration, temperature, time and pH of solution had influence on the weight loss, linear density, breaking strength, elongation and mean length of flax noil fiber.(3) The optimal process was obtained by orthogonal design on the basis of single factor experiments on enzymatic treatments, and the performance of the fiber thus obtained was tested and analyzed. We choosed the best processing paraments: enzyme concentration is 2%, treating time is 2 hours, temperature is 55℃. And the properties of the modified fibers are as follows:the weight loss is 11.6%, linear density is 6.17 dtex, breaking streneth is 5.2cN/dtex, elongation is 4.53%, mean length is 43.90mm, the standard deviation of length is 17.75%, and short fiber content is 10.79%.(4) Ether modification of flax noil fiber needed the pretreatment process, which could make the fiber fully swelling and activation so as to accelerate the modification.(5) The morphology, FTIR spectra, X-ray diffraction spectra, CP/MAS-13C-NMR, tensile properties and linear density of the ether modified flax noil fiber were all discussed. The result showed that:the flax noil fiber modified by epoxyethane become full round, with decreased crystallinity and breaking strength, significantly increased elongation, and slightly decreased linear density.
|