A kind of oxidative crosslinking modified starch and preparation method thereof
A technology of oxidative cross-linking and starch, which is applied in the field of modified starch, can solve the problems of low viscosity, achieve the effects of low thermal decomposition temperature, wide range of sources, anti-phase separation and anti-freeze performance
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Embodiment 1
[0031] In this example, the oxidized cross-linked modified starch is prepared by the following method, and the specific operation steps are as follows:
[0032] 1) Put 100 parts of cornstarch into the reactor, then add 150 parts of water into the reactor, add 2 parts of sodium chloride while stirring, and mix well to obtain a mixed solution;
[0033] 2) Warm up the mixed solution prepared in step 1) to 50° C., then add an aqueous sodium hydroxide solution with a mass concentration of 2% to adjust the pH of the mixed solution to 8, then add 1 part of sodium hypochlorite, and react for 2 hours to obtain a reaction solution 1;
[0034] 3) Add 0.1 part of sodium sulfite to the reaction solution 1 prepared in step 2), and after reacting for 10 minutes, terminate the oxidation reaction to obtain reaction solution 2;
[0035] 4) Add 2% aqueous sodium hydroxide solution to the reaction solution 3 prepared in step 3), adjust the pH=9 of the reaction solution 3, then add 0.05 parts of s...
Embodiment 2
[0039] In this example, the oxidized cross-linked modified starch is prepared by the following method, and the specific operation steps are as follows:
[0040] 1) Put 100 parts of wheat starch into the reactor, then add 200 parts of water into the reactor, add 4 parts of sodium chloride while stirring, and mix well to obtain a mixed solution;
[0041] 2) Warm up the mixed solution prepared in step 1) to 40° C., then add an aqueous sodium hydroxide solution with a mass concentration of 4% to adjust the pH of the mixed solution to 9, then add 2 parts of sodium hypochlorite, and react for 3.5 hours to obtain a reaction solution 1;
[0042] 3) Add 0.2 parts of sodium sulfite to the reaction solution 1 prepared in step 2), and after reacting for 20 minutes, terminate the oxidation reaction to obtain reaction solution 2;
[0043]4) Add 4% aqueous sodium hydroxide solution to the reaction solution 3 prepared in step 3), adjust the pH of the reaction solution 3 to 10, then add 0.1 pa...
Embodiment 3
[0047] In this example, the oxidized cross-linked modified starch is prepared by the following method, and the specific operation steps are as follows:
[0048] 1) Put 100 parts of pea starch into the reactor, then add 250 parts of water into the reactor, add 6 parts of sodium chloride while stirring, and mix well to obtain a mixed solution;
[0049] 2) Warm up the mixed solution prepared in step 1) to 30° C., then add an aqueous sodium hydroxide solution with a mass concentration of 6% to adjust the pH of the mixed solution to 10, then add 4 parts of sodium hypochlorite, and react for 5 hours to obtain a reaction solution 1;
[0050] 3) Add 0.5 parts of sodium sulfite to the reaction solution 1 prepared in step 2), and after reacting for 30 minutes, terminate the oxidation reaction to obtain reaction solution 2;
[0051] 4) Add 6% aqueous sodium hydroxide solution to the reaction solution 3 prepared in step 3), adjust the pH of the reaction solution 3 to 11, then add 0.2 part...
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