965 resultados para Dyes and dyeing - Wool


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"Completely revised and rewrittten edition."

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Describes the development of a cell to hold loose wool fibre, fabric and yarn samples for the collection of Fourier Transform Raman spectra. Then follows a detailed study of reactions of Lanasol (Ciba) dyes with wool, the dyes forming covalent bonds with various amino acids in the fibres.

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Spine title: McKernan on printing and dyeing silks.

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Atmospheric pressure plasma with a relatively short exposure time was sufficient to modify the wool surface. The ageing studies showed the hydrophobic recovery of fibre surface took place at the early stages after plasma treatment. While plasma improved wool shrink-resistance, improvement in dyeability depends on the hydrophilic-hydrophobic nature of dyestuff.

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Fibers based regenerated protein draw much attention for recycling discarded protein resources and can produce biodegradable and environmental friendly polymers. In this study, superfine wool powder is blended with polypropylene (PP) to produce wool powder/PP blend film through extrusion and hot-pressing. Hydrogen peroxide is used to bleach the black colored surface of the blend films. The effects of peroxide concentration, bleaching time and powder content on the final whiteness and mechanical properties of the blend films are investigated.

The bleached films are dyed with acid red dyes and the dyed color is evaluated using a Computer Color Matching System. Color characters of dyed films, such as L*, a*, b*, ΔE*ab, C*ab and K/S values are measured and analyzed. The study not only reuses discarded wool resources into organic powder, widens the application of superfine wool powder on polymers, but also improves the dyeing properties of PP through the addition of protein content.

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Ultrasonics has the potential to reduce the cost and environmental impact of textile processing. This work investigates the effects of utrasonic irradiation during wool scouring on fibre surface properties and fibre dyeing rate. A range of ultrasonic frequencies were used in the scouring bath to examine the forms of fibre cuticle damage. It was shown that ultrasonically scoured wool underwent some modifications of the fibre surface structure which resulted in a higher rate of dye uptake by the fibres, when compared with the conventionally scoured wool. The lower the ultrasonic frequency the more sever was the cuticle damage to wool during scouring, hence the higher the fibre dye uptake.

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A method has been developed for producing photochromic wool fabric by applying a layer of hybrid silica containing a photochromic dye onto wool fibres. A number of different hybrid silicas were prepared by the sol-gel technique involving co-hydrolysis and co-condensation of alkyltrialkoxysilanes together with 3-glycidoxypropyltrimethoxysilane. With the dye Photorome II, it was possible to obtain a photo chromic coating which showed fast optical response. The coating had only a slight effect on the fabric handle. The durability of the coating appeared to be acceptable, at least for fashion wear.

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This thesis investigates the possibility of producing photochromic wool fabrics using a silica sol-gel coating method. Silicas made from sol-gel methods are uniquely suited to host photochromic dyes for developing colour-changing wool. The achieved photochromic effects have opened a new product area for fashion effects on wool textiles.

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Mode of access: Internet.

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Includes index.