Ziel
Natural fibres as cotton, linen and wool are bleached in most cases oxidatively. Hydrogen peroxide is used to bleach protein fibres which cause a fibre damage. Hypochlorite and chlorite which are used to bleach cellulosic fibres have to be replaced because of a contamination of the materials and the textile effluents with AOX. By hydrogen peroxide the bleaching of cellulosic fibres may be unsatisfactorily as black non-cellulosic contaminants are hardly decolorised.
Alternative bleaching techniqiues for natural fibres shall be developed. Natural fibres can be bleached with light. By exposure to blue-light wool is bleached without a significant fibre damage. Further advantages of photobleaching are : low-priced procedure, no drying processes, improved light stability of the bleached wool. However, the whitening effect achieved so far is lower than that of chemical bleaching.
Methods have to be developed to increase the whitening effect of wool by irradiation with different light sources and combination of light exposure and treatment with chemicals.
For cellulosic fibres a procedure for bleaching by exposure to light shall be developed.
Further the treatment of natural fibres with enzymes to achieve a bleaching effect shall be investigated.
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65760 Eschborn
Deutschland