Research On The Dyeing Properties Of Several Kinds Of Natural Fiber Dyed By Sorghum Red Pigment

Sorghum red pigment is a kind of natural product. There are three advantages: First, its raw material resource is abundant and low-priced, The content is the highest almost among all kinds of plants dyestuffs-up to 8.5%; Second, It doesn't pollute environment in its production process, Its extraction method is more simple, and can made sorghum shell from waste material to useful one; In the end, Sorghum natural dyestuff is stable to the light, heat, oxidizing agents, reduction agents, there is no prison, no special odor, and its safety performance is very safe.From the view of domestic and overseas, research on the sorghum red dyestuff is mainly about the development of extraction technology of its edible pigment, and it is used only on the aspect of food dyeing, but it is not widely used on the fabric dyeing yet.The research on the extract method of sorghum red dyestuff and physics, chemical properties in the paper, The optimum extraction conditions is determined by experiments, then direct dyeing., beforehand medium and afterward dyeing on 4 kinds of natural fibers-wool silk of silkworm tussah silk cotton fabric by quadrature experiments.The experimental result is shown as follows: the dry, wet rubbing fastness and washing color staining fastness of the 4 kinds of fabrics are all perfect, up to 4 level; The light-resistant fastness of wool fabric is better, The sample's light fastness of dyeing with Fe₂SO₄ is 3⁴ level, that of tussah silk is the second, silk of silkworm and cotton fabric are not good enough. Therefore, the dyestuff is fit for protein fiber dyeing, .As for cellulose fiber dyeing, we should do further research.