Extraction method of high-stability salix leaf pigment dye
A technology with high stability and extraction method, which is applied in the field of willow leaf pigment dye extraction, can solve the problems of ineffective use of salicylic acid and its derivatives, poor pigment stability and dyeing effect, and achieve high value Utilization, accelerated dissolution, and high stability effects
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[0019] A method for extracting a highly stable willow leaf pigment dye, comprising the following steps:
[0020] (1) Pick fresh, complete and mature willow leaves, wash them and put them into a grinder, add anhydrous ethanol and nano-silica in turn, and then grind and pulverize them. The slurry is leached twice at 60°C. Lift for 2h to get the extract;
[0021] (2) Filter the extract through an ultrafiltration membrane, collect the filtrate, concentrate and dry the filtrate to obtain pigment powder for use;
[0022] (3) Take chitosan and phthalic anhydride, put them into DMF in turn, heat up to 100°C, stir and reflux for 4 hours under nitrogen atmosphere, pour the reaction product into ice water, and wash the obtained precipitate to neutrality with alcohol After post-drying, the material is ground into fine powder to obtain modified chitosan for use;
[0023] (4) Put the pigment powder and modified chitosan into methylene chloride in turn, stir and react under ice bath condit...
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