Preparation method for cassava starch modified by combining three kinds of modification processes
A denatured cassava starch and three-component compounding technology, which is applied in the direction of starch-derived adhesives, adhesive types, polyether adhesives, etc., can solve the problems that have not been reported in public literature, and improve the permeability of paste liquid Sex and cohesiveness, improve the uniformity of reaction, reduce the effect of gelatinization temperature
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Embodiment 1
[0032] In the reaction tank, adjust 1000 kg of tapioca raw starch into a starch slurry with a weight concentration of 35% with clear water, add a 3% sodium hydroxide aqueous solution to adjust the pH value of the starch slurry to 8.5, adjust the temperature of the starch slurry to 30 ° C, and activate React for 20 minutes to obtain activated starch slurry;
[0033] In the activated starch slurry, add 1 kg of epichlorohydrin, adjust the temperature of the starch slurry to 30°C, stir and react for 30 minutes, then add 10 kg of sodium hypochlorite with an available chlorine content of 15% at 30°C for 1 hour, and add The hydrochloric acid aqueous solution that is 10% by weight concentration or the sodium hydroxide aqueous solution that is 3% by weight concentration adjusts the pH value of starch slurry to 8.5, the temperature of starch slurry is reduced to 25 ℃ when the reaction is completed, and the sodium hydroxide aqueous solution that adds weight concentration is 3% Or the hyd...
Embodiment 2
[0037] In the reaction tank, adjust 1000 kg of tapioca raw starch into a starch slurry with a weight concentration of 37% with clear water, add a 5% sodium hydroxide aqueous solution to adjust the pH value of the starch slurry to 9.0, adjust the temperature of the starch slurry to 30 ° C, and activate React for 20 minutes to obtain activated starch slurry;
[0038]In the activated starch slurry, add 5 kg of epichlorohydrin, adjust the temperature of the starch slurry to 35 ° C, stir and react for 0.5 hours, and then add 200 kg of sodium hypochlorite with an available chlorine content of 10% in three times, and the three additions are 65 Kg, 65 kg, 70 kg, the time interval between each addition is 1 hour, and the total reaction time is 5 hours from the first addition of sodium hypochlorite, the reaction temperature is 35 ° C, and the reaction is simultaneously added with a sulfuric acid solution with a weight concentration of 10% or a weight concentration of 5 % sodium hydroxid...
Embodiment 3
[0042] In the reaction tank, adjust 1000 kg of tapioca raw starch into a starch slurry with a weight concentration of 40% with clear water, add a 10% sodium hydroxide aqueous solution to adjust the pH value of the starch slurry to 8.7, adjust the temperature of the starch slurry to 30 ° C, and activate React for 20 minutes to obtain activated starch slurry;
[0043] In the activated starch slurry, add 10 kg of epichlorohydrin, adjust the temperature of the starch slurry to 40 ° C, stir and react for 0.5 hours, and then add 100 kg of sodium hypochlorite with an available chlorine content of 11% in two times, and the amount added each time is 50 kg, the time interval for the second addition is 1 hour, and the total reaction time is 3 hours from the first addition of sodium hypochlorite, the reaction temperature is 40 ° C, and at the same time, add sulfuric acid aqueous solution with a weight concentration of 20% or a weight concentration of 10% Sodium hydroxide The aqueous solut...
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