Preparation method of crosslinked-acetylated-succinate ternary composite modified starch
A succinate ester and ternary compound technology, which is applied in the field of starch modification, can solve the problems of modified starch products that cannot meet the requirements and application limitations, and achieve the effects of improving anticoagulation and transparency, enhancing affinity, and increasing viscosity
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Embodiment 1
[0034] A preparation method of compound modified starch, the method uses potato starch as raw material, adopts wet method to prepare cross-linking-acetylation-succinate ternary compound modified starch, and its specific steps are as follows:
[0035] Step 1: 1000kg of potato starch and water are mixed into starch milk with a concentration of 38% by mass, adding 10kg of sodium chloride, adjusting the pH value to 11.0 with a concentration of 3% by mass of sodium hydroxide solution, and raising the temperature to 25°C ;
[0036] Step 2: add 0.15 kg of phosphorus oxychloride, react for 2 hours, add hydrochloric acid with a concentration of 5% by mass to adjust the pH value to 8.5;
[0037] Step 3: Add 60kg of mixed acid anhydride, which is formed by mixing succinic anhydride and acetic anhydride in a mass ratio of 1:5, and maintain the pH of the system at 8.5 with a sodium hydroxide solution with a concentration of 3% by mass , reacted for 1 h, and adjusted the pH value to 6.3 wi...
Embodiment 2
[0040] A preparation method of composite modified starch, the method uses cassava starch as raw material, adopts wet method to prepare cross-linking-acetylation-succinate ternary composite modified starch, and its specific steps are as follows:
[0041] Step 1: 1000kg tapioca starch and water are made into starch milk with a concentration of 40% by mass, add 5kg of sodium chloride, adjust the pH value to 11.5 with a concentration of 3% by mass of sodium hydroxide solution, and heat up to 25°C .
[0042] Step 2: Add 0.10 kg of phosphorus oxychloride, react for 2.5 hours, and add hydrochloric acid solution with a concentration of 5% by mass to adjust the pH value to 9.0.
[0043] Step 3: Add 50kg of mixed acid anhydride, which is formed by mixing succinic anhydride and acetic anhydride in a mass ratio of 1:4, and maintain a pH value of 9.0 with a sodium hydroxide solution with a concentration of 3% by mass, and react 1.5h, adjust the pH value to 6.5 with a hydrochloric acid sol...
Embodiment 3
[0046] A preparation method of composite modified starch, the method uses waxy cornstarch as raw material, adopts wet method to prepare cross-linking-acetylation-succinate ternary composite modified starch, and its specific steps are as follows:
[0047] Step 1: 1000kg waxy cornstarch and water are made into the starch milk that concentration is 38% by mass fraction, add 15kg sodium chloride, be that the sodium hydroxide solution of mass fraction 4% is adjusted pH value to 11.0 with concentration, be warming up to 30°C;
[0048] Step 2: Add 0.20kg of phosphorus oxychloride, react for 1.5h, add hydrochloric acid solution with a concentration of 5% by mass to adjust the pH value to 9.0;
[0049] Step 3: Add 30kg of mixed acid anhydride, which is formed by mixing succinic anhydride and acetic anhydride in a mass ratio of 1:6, adjusted with a sodium hydroxide solution with a concentration of 3% by mass to maintain the pH of the system to 9.5, react for 2 hours, adjust the pH valu...
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