Preparation method of oxidative cationic modified starch slurry
A modified starch, cationic technology, used in textiles and papermaking, fiber processing, etc., can solve problems such as high viscosity, yarn stains, poor thermal stability, etc.
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Embodiment 1
[0034] Example 1 Potato oxidized cationic modified starch
[0035] Prepare potato oxidized cationic starch according to the following steps:
[0036] 1). Adjust the raw potato starch and water into starch milk according to the mass ratio of 1:1;
[0037] 2). Start heating to raise the temperature of starch milk to 40.0°C, adjust the pH value to 8.0 with 2% sodium hydroxide solution, and slowly add industrial grade sodium hypochlorite equivalent to 1.0% of the original starch mass (calculated as 100% sodium hypochlorite) solution, the oxidation reaction has been kept at 8.5-9.5 throughout the process, while maintaining the temperature at 40-42 ° C; from the calculation of the addition of sodium hypochlorite, the oxidation reaction should continue for 1.5 hours;
[0038] 3). After the oxidation reaction is finished, use 0.004% sodium sulfite relative to the original starch mass to remove chlorine, which can be detected by starch potassium iodide test paper until the chlorine re...
Embodiment 2
[0043] Embodiment 2 Potato oxidized cationic starch
[0044] Prepare potato oxidized cationic starch according to the following steps:
[0045] 1). Adjust the raw potato starch and water into starch milk according to the mass ratio of 1:1;
[0046] 2). Start heating to raise the temperature of starch milk to 41.5°C, adjust the pH value to 8.25 with 3.8% sodium hydroxide solution, and slowly add industrial grade sodium hypochlorite equivalent to 0.7% of the original starch mass (calculated as 100% sodium hypochlorite) Solution, keep the pH at 8.9-9.2 throughout the oxidation reaction, and keep the temperature at 41-42°C; the oxidation reaction should continue for 2 hours from the time when the sodium hypochlorite is added;
[0047] 3). After the oxidation reaction is finished, use 0.005% sodium sulfite relative to the original starch mass to remove chlorine;
[0048] 4). After chlorine removal, adjust the pH value of starch milk to 11.50 with 5% sodium hydroxide solution;
...
Embodiment 3
[0052] Embodiment 3 Potato oxidized cationic starch
[0053] Prepare potato oxidized cationic starch according to the following steps:
[0054] 1). Adjust the raw potato starch and water into starch milk according to the mass ratio of 1:1;
[0055] 2). Start heating to raise the temperature of starch milk to 42°C, adjust the pH value to 8.50 with 4% sodium hydroxide solution, and slowly add industrial grade sodium hypochlorite equivalent to 0.3% of the original starch mass (calculated as 100% sodium hypochlorite) solution, the oxidation reaction has been kept at 9.0-9.2 throughout the process, while maintaining the temperature at 41-42 ° C; from the calculation of the addition of sodium hypochlorite, the oxidation reaction should continue for 2.5 hours;
[0056] 3). After the oxidation reaction is finished, use 0.0015% sodium sulfite relative to the original starch mass to remove chlorine;
[0057] 4). After chlorine removal, adjust the pH value of starch milk to 11.25 with ...
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