Composite modified starch and preparation method thereof
A technology for compounding modified starch and starch slurry, applied in the field of modified starch, can solve the problems of high cost, high equipment requirements, high energy consumption, etc., and achieve the effects of easy operation, easy control of process conditions, and strong practicability
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Embodiment 1
[0026] (1) Deploying starch slurry: take 120 parts of water and put it in the reaction kettle, turn on the agitator, add 8 parts of sodium sulfate under stirring, add 100 parts of waxy cornstarch after the sodium sulfate is dissolved, and stir evenly to obtain Starch slurry;
[0027] (2) Etherification reaction: adjust the pH of the starch slurry obtained in the above step (1) to 11 with a sodium hydroxide solution with a mass concentration of 2%, add 5 parts of propylene oxide, react at 20°C for 2h, and heat up to 35°C , etherified at pH 11 for 14h;
[0028] (3) Crosslinking reaction: adjust the pH of the reaction solution of the above step (2) to 10 with a hydrochloric acid solution with a mass concentration of 10%, add 0.1 part of sodium trimetaphosphate, and react to the desired viscosity;
[0029] (4) Adjust the pH of the reaction solution that has completed the crosslinking reaction in the above step (3) to 9 with 10% hydrochloric acid solution, add 4 parts of octenyl s...
Embodiment 2
[0032] (1) Deploying starch slurry: take 150 parts of water and put it in the reaction kettle, turn on the agitator, add 9 parts of sodium chloride under stirring, add 100 parts of cornstarch after the sodium chloride is dissolved, and stir evenly. Starch slurry;
[0033] (2) Etherification reaction: adjust the pH of the starch slurry obtained in the above step (1) to 12 with a sodium hydroxide solution with a mass concentration of 2-3%, add 8 parts of propylene oxide, react at 15°C for 2h, and heat up to Etherification at pH 11 for 16 hours at 40°C;
[0034] (3) Cross-linking reaction: adjust the pH of the reaction solution in the above step (2) to 11 with a hydrochloric acid solution with a mass concentration of 20%, add 0.3 parts of phosphorus oxychloride, and react to the required viscosity;
[0035] (4) Adjust the pH to 10 with 20% hydrochloric acid solution in the reaction liquid that has completed the crosslinking reaction in the above step (3), add 6 parts of octenyl ...
Embodiment 3
[0038] (1) Deploying starch slurry: take 180 parts of water and put it in the reaction kettle, turn on the agitator, add 10 parts of sodium sulfate under stirring, add 100 parts of tapioca starch after the sodium sulfate is dissolved, and stir evenly to get the starch slurry milk;
[0039] (2) Etherification reaction: adjust the pH of the starch slurry obtained in the above step (1) to 12 with a sodium hydroxide solution with a mass concentration of 3%, add 10 parts of propylene oxide, react at 25°C for 2h, and heat up to 45°C , etherified at pH 12 for 18h;
[0040] (3) Cross-linking reaction: adjust the pH of the reaction solution of the above step (2) to 11 with a mass concentration of 10% sulfuric acid solution, add 0.4 parts of sodium trimetaphosphate, and react to the required viscosity;
[0041] (4) Adjust the pH to 10 with 10% sulfuric acid solution in the reaction solution that has completed the crosslinking reaction in the above step (3), add 8 parts of octenyl succi...
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