| The dyeability of flax can be improved provided the fiber is chemically modified by inducing quaternary amino groups, which has been studied in detail in this paper.Theoretical analyze and prepare experiments have been done firstly. The results have showed that epoxy based quaternary ammonium compounds are fit for modifying the dyeability of flax. The epoxy based quaternary ammonium salt named REF has been synthetised successfully through repeated testing in this paper. The optimum synthetic technology conditions have been investigated. The results are that the radio of mole of reaction materials is 1:1, pH of reaction bath is 7, for ISOmin at 80 10 . The ideal solvent is the blend of methyl and ethanol that their proportion is 1:2.5.The studies on chemical mechanism of modifying on flax have been carried out by infrared spectrometry. The pretreated ways of flax fabric and optimum pretreated technology conditions have been studied using mathematical statistics. The results have showed that the optimum technology conditions of exhaustion process are that the concentration of REF is 40 g/L, and NaOH is 15 g/L at a liquor ratio of 20:1 for Ih at 60 1C . The optimum technology conditions of pad - dry - bake procedure are that REF is 47.88 g/L, and NaOH is 30.69 g/L at 124 'C for 3 minutes.Binding states between modified flax fabrics and anion dyes have been investigated by infrared spectrometry, X ?diffraction, peeling of color and experiments on water proofing of modified flax fabric with taking reactive red X-3B, direct Chinese red 6B and acid yellow G for examples. The results show that binding force between modified flax and acid dye is coulomb's force, and besides hydrogen bond and gravitation among molecule, electrovalent bond has been formed among direct dye and modified flax. Reactive dye not only can covalent-ly bind with modified flax by nucleophilic reaction, but also can form electrovalent bond. Attracting among hydronium is of benefit to nucleophilic reaction.The thermodynamics principle of dyeing of modified flax fabric has been studied in the aspects of adsorption isotherm, dying appetency, substantivity and saturation value and so on. The results indicate that dyeing adsorption isotherm of modified flax fabric belongs to the characteristic equation curve of Langmiur, which is according to the mechanism of electric adsorption. Moreover dyeing substantive has doubled, and dyeing appetency increase by about quintupling as compared with general flax fabric. Anion dye with several sulfonic groups occurs adsorption of overtaking in the number of mole when dyeing modified flax fabric.The kinetics mechanism of dyeing of modified flax fabric has been investigated from the aspects of dyeing speed and pervasion velocity. The results have revealed that the exhaustionalmost achieves maximum when the dyeing time is 15 minutes. When the amount of nitrogen contained by the modified flax fabric is smaller, the dyeing pervasion velocity increases as compared with general flax fabric. But when the content of nitrogen of modified fabric increases to a certain degree, its dyeing diffuse velocity is in inverse proportion to the content of nitrogen. The pervasion velocity increases with the dyeing temperature Namely, the dyeing temperature is of benefit to diffusing of dye.The dyeing performance of modified flax fabric has been studied. The results have revealed that fastness of dry and wet rubbing and washing fastness of flax fabric with REF treatment is the same as that of the flax fabric without REF treatment. The fastness of part of dyed modified flax fabric increase by 0.5 grade as compared with the general flax fabric. The levelness and penetrability of dyeing of flax fabric modified by REF is best provided dye bath is fully stired when dyeing.The wearing performance of flax fabric with REF treatment has been studied. The results have showed that elongation at break, elastic recovery percentage of elongation, pliability, pendency, frictional resistance and moisture absorption of modified f...
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