Solvent extraction of yellow colouring matter from natural source-flowers and its appliction on hydrophobic substrates

摘要

Hydrophobic fibres are highly crystalline and non-polar polymers hence pose a big problem for dyers in dyeing by traditional methods. In the present work dyeing of hydrophobic fibres in the form of textiles was achieved from eco-friendly yellow natural colouring matter obtained from flowers- a source whose collection does not affect the sustenance and growth of the parent source- plant. The present method employed is giving a much better result than the traditional way of dyeing. It is easy, less time consuming and non-toxic in nature. The process comprises of transfer of colouring matter from suitable solvent extract of the flowers (obtained by cold percolation method) to the fabric with the help of dyeing accessories like wetting agent and carrier treatment. The polymers nylon and acrylic showed very good result by this treatment. But in case of polymer polyester where there in no initial bonding of colour on fibre by usual dipping method of dyeing there was definite improvement by treatment with dyeing accessories. The best result was obtained by pressure technique. The colouring matter is smaller in size when compared to traditional dyes hence pressure technique is giving better result. It is giving a shade, which is brighter and has very good fastness property almost as good as synthetic reactive dyes. This gives a scope for extracting and applying these natural colouring matters on hydrophobic fibres in a large scale and gives a scope of getting the colouring matter in solid state. Hence it can act as a good method of preservation.