Date peel red pigment, and preparation and application thereof
A technology for red pigment and jujube peel, which is applied to natural pigment and its preparation and in the field of hair dyeing, can solve the problems of high cost, unsuitable for industrialized production, complicated process of jujube peel pigment, etc., and achieves low cost, fast dyeing speed, and no occurrence of Effects of allergic reactions
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Embodiment 1
[0017] Wash the jujube skin with water, dry or dry it and break it; weigh 50g of the broken jujube skin, extract it with 750mL aqueous solution under reflux, add 0.5% soda ash (mass percentage of soda ash relative to the jujube skin), and mix Put it in an ultrasonic-microwave extractor, and treat it with microwave for 100s at a microwave power of 350w; then use an ultrasonic power of 200w, and ultrasonically treat it for 30min; The filtrate is filtered with a polymer membrane with a molecular weight cut-off of 7500 Daltons, the filtration pressure is 0.75 MPa, and the filtration temperature is 30 ° C. The permeate is collected to obtain a jujube red pigment solution; the jujube red pigment solution is spray-dried and set to The air temperature is 150°C, and the air outlet temperature is 80°C. The solid obtained after drying is pulverized to obtain jujube red pigment with a yield of 13%.
Embodiment 2
[0019] Wash the jujube skin with water, dry or dry it and break it; weigh 50g of the broken jujube skin, reflux extract with 500mL aqueous solution, add 0.25% soda ash (mass percentage of soda ash relative to the jujube skin), mix Put it in an ultrasonic-microwave extractor, and treat it with microwave for 50s at a microwave power of 200w; then use an ultrasonic power of 100w, and ultrasonically treat it for 10min; The filtrate is filtered with a polymer membrane with a molecular weight cut-off of 5000 Daltons, the filtration pressure is 0.5 MPa, and the filtration temperature is 20°C. The permeate is collected to obtain a jujube red pigment solution; the jujube red pigment solution is spray-dried and set to The air temperature was 140°C, and the outlet air temperature was 70°C. The solid obtained after drying was pulverized to obtain jujube red pigment with a yield of 11%.
Embodiment 3
[0021] Wash the jujube skin with clean water, dry or dry it and break it; weigh 50g of the broken jujube skin, extract it with 1000mL aqueous solution under reflux, add 0.75% soda ash (the mass percentage of soda ash relative to the jujube skin), mix Put it in an ultrasonic-microwave extractor, and treat it with microwave for 150s at a microwave power of 500w; then use an ultrasonic power of 300w, and ultrasonically treat it for 50min; The filtrate is filtered with a polymer membrane with a molecular weight cut-off of 10,000 Daltons, the filtration pressure is 1MPa, and the filtration temperature is 40°C. The permeate is collected to obtain a jujube red pigment solution; the jujube red pigment solution is spray-dried, and the air inlet is set The temperature is 160°C, the air outlet temperature is 90°C, and the solid obtained after drying is pulverized to obtain jujube red pigment with a yield of 16%.
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