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Research on the Structure and Dyeing Properties of Hemp Fiber with Liquid Ammonia Treatment

Author: GaoYan
Tutor: ZhouYongKai
School: Beijing Institute of Clothing Technology
Course: Textile Material and Textiles Design
Keywords: Hemp fabric Liquid ammonia treatment Fiber structure Direct Dyes Reactive Dyes Dyeing
CLC: TS193.1
Type: Master's thesis
Year: 2010
Downloads: 88
Quote: 1
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Abstract


In this paper, by scanning electron microscopy, X-ray diffraction, than the surface area of ??testing and testing and other means of infrared spectroscopy to study the structural changes of the hemp fiber before and after ammonia treatment. The results showed that: the ammonia treatment after the fiber surface becomes smooth, longitudinal cracks and rough Results reduced, the fibers become more closely; lower degree of crystallinity, grain size has little change, most of the cellulose Ⅰ cellulose Ⅲ ; the fibers pore size distribution is narrowed, and the specific surface area decreased, decreases the effective volume; characteristic peaks 896cm -1 in enhanced 3475cm -1 at the appearance of new peaks, hemp fibers after with the liquid ammonia treatment ... H ... N hydrogen bonds stretching vibration caused by O ... H peak distinct separation. Select a different type, direct dyes and reactive dyes of the structure, using the dip method, respectively, the fabric before and after the ammonia treatment of cannabis staining study different dyeing conditions, such as the amount of salt, the alkali dosage and the dyeing temperature, its staining uptake rate, fixing rate, to draw dye uptake curve. To develop the various dye hemp fabric dyeing the optimum conditions, evaluation dye products K / S value and color fastness indicators. Relatively liquid ammonia treated fabric dyeing performance differences, analysis of the impact of changes in the structure of hemp fiber fabric dyeing properties before and after ammonia treatment. The study found: a variety of direct dyes liquid ammonia treatment, dyeing, the dye rate is lower than the untreated fabric; higher dye uptake of small molecular weight dye, dye uptake is low molecular weight dye. The structure of the dye dyeing performance also exists a certain impact, better performance of the linear structure of the dye staining, the poor performance of the phthalocyanine dyes. Reactive blue, reactive yellow and reactive violet dyed hemp fabric before and after ammonia treatment reactive dyes on fabric dyeing liquid ammonia treatment on dye uptake, fixation rate and K / S values ??are higher than the untreated fabric, but the use the active Cuilan of liquid ammonia treatment fabric dyeing rate than untreated fabric. Reactive brilliant blue and two reactive yellow dye hemp fabric dyeing, better performance, the active purple and active Cuilan of poor. The study found that the changes in the distribution of the fiber aperture caused by the liquid ammonia treatment is the major factor to cause the performance difference of the direct dye. The main factors of reactive dyes is the change of the crystalline structure of the fiber caused by ammonia treatment, increased fiber amorphous regions can increase the dye molecules inside the fiber, good dyeing properties; Conversely, poor dyeing properties .

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CLC: > Industrial Technology > Light industry,handicrafts > Textile industry,dyeing and finishing industry > Dyeing and finishing industry > Dyeing > Staining physics, dyeing chemical
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