Preparation method of cross-linked hydroxypropyl composite modified starch by one-step process
A compound modified starch and hydroxypropyl technology, which is applied in the field of modified starch, can solve the problems of affecting the amount of cross-linking agent added, the reduction of etherification reaction efficiency, and the reduction of starch milk concentration, so as to prolong the cross-linking reaction time and reduce production capacity. Consumption, the effect of reducing the amount
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[0018] Example 1
[0019] (1) Add 13kg of anhydrous sodium sulfate, 0.05kg of sodium trimetaphosphate, 1.0kg of sodium hydroxide to 163kg of deionized water, mix and stir until it dissolves, then add 100kg of starch (dry basis), and stir for alkalization time: 60min.
[0020] (2) The temperature is raised to 40°C, 8kg of propylene oxide is added, and the reaction is carried out for 16 hours, and then 10% hydrochloric acid is added for neutralization, and the pH value is adjusted to 6.5.
[0021] (3) The neutralized starch milk is washed to remove impurities and reaction by-products, and then centrifuged, dehydrated, dried, and sieved to obtain cross-linked hydroxypropyl composite modified starch.
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[0022] Example 2
[0023] (1) Add 15kg of anhydrous sodium sulfate, 0.08kg of sodium trimetaphosphate, 1.2kg of sodium hydroxide to 185kg of deionized water, mix and stir to dissolve, and then add 100kg of starch (dry basis), stirring for alkalization time: 40min.
[0024] (2) The temperature was raised to 42°C, 5kg of propylene oxide was added, and the reaction was carried out for 18 hours, and then 10% hydrochloric acid was added for neutralization, and the pH value was adjusted to 6.5.
[0025] (3) The neutralized starch milk is washed to remove impurities and reaction by-products, and then centrifuged, dehydrated, dried, and sieved to obtain cross-linked hydroxypropyl composite modified starch.
Example Embodiment
[0026] Example 3
[0027] (1) Add 14kg of anhydrous sodium sulfate, 0.03kg of sodium trimetaphosphate, 1.1kg of sodium hydroxide to 170kg of deionized water, mix and stir until it dissolves, then add 100kg of starch (dry basis), and stir for alkalization time: 50min.
[0028] (2) The temperature was raised to 42°C, 10kg of propylene oxide was added, and the reaction was carried out for 14 hours, and then 10% hydrochloric acid was added for neutralization, and the pH value was adjusted to 7.
[0029] (3) The neutralized starch milk is washed to remove impurities and reaction by-products, and then centrifuged, dehydrated, dried, and sieved to obtain cross-linked hydroxypropyl composite modified starch.
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