Method for bleaching and tackifying water-soluble amylose gelatine powder
A water-soluble polysaccharide and water-soluble technology, which is applied in the field of bleaching and thickening of water-soluble polysaccharides, can solve the problems of difficult bleaching reaction operation, lower viscosity of water-soluble polysaccharide rubber powder solution, and low production efficiency, and achieve the goal of overcoming low production efficiency , facilitate implementation and promotion, and improve production efficiency
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Embodiment 1
[0019] Weigh 50g of yellowish locust bean gum powder with a protein content of less than 3%, add it to 150ml of 40% alcohol aqueous solution, start stirring to fully disperse, adjust pH=2 with acid, add 7.5% sodium hypochlorite solution with an available chlorine content of 10%. g, after bleaching at room temperature for 30 minutes, adjust the pH of the reaction solution to 5.5 to 6.5 with alkali, remove excess sodium hypochlorite with sodium bisulfite, filter, and wash the filter cake with an appropriate concentration of 40% alcohol solution. Dry at 60°C and pulverize to obtain white locust bean gum powder, prepare a 2% rubber powder solution, heat and stir until completely dissolved, then cool, and use NDJ-1 type rotational viscometer to measure the viscosity of the glue solution at 25°C, the result It shows that the glue viscosity after bleaching is 38% higher than the glue viscosity before bleaching.
Embodiment 2
[0021] It is basically the same as in Example 1, except that the bleaching agent sodium hypochlorite and its consumption are replaced by 7.5 g of chlorine dioxide with an active ingredient of 8%, the pH is adjusted to 2.5, and excessive chlorine dioxide is removed with sodium bisulfite, and white color can also be obtained. Locust bean gum powder, the results showed that the viscosity of the glue after bleaching increased by 30.5% compared with the viscosity of the glue before bleaching.
Embodiment 3
[0023] Weigh 50g of yellowish locust bean gum powder with a protein content of less than 3%, add it to 150ml of 40% ethanol aqueous solution, start stirring to fully disperse, adjust pH=2.5 with acid, add 12.5g of 30% hydrogen peroxide solution, and After bleaching at room temperature for 120 minutes, the pH of the reaction solution was adjusted to 5.5-6.5 with alkali, excess hydrogen peroxide was removed with sodium bisulfite, filtered, the filter cake was dried at 60°C, and crushed to obtain white locust bean gum powder. Prepare 2% rubber powder solution, heat and stir until completely dissolved, then cool, measure the viscosity of the glue solution at 25°C with an NDJ-1 rotary viscometer, the results show that the viscosity of the glue solution after bleaching is higher than that before bleaching 16.5%.
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