A kind of preparation technology of oxidized cationic sizing starch
A technology for sizing starch and preparation process, which is applied in the directions of adding water repellents, paper, textiles and papermaking to achieve the effects of less precipitation, fast gelatinization and good film-forming properties
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[0026] (1) Oxidation reaction:
[0027] Take 1000 parts by weight of tapioca starch, put it into a dry reaction kettle and spray it into the starch with a volume concentration of 3-5% diluted lye, adjust the pH value to 9, and then spray sodium hypochlorite. The amount of sodium hypochlorite is 5% of tapioca starch. %, after fully stirring evenly, draw a vacuum, the vacuum degree is 300-500Pa, heat to 60°C, and react for 2 hours.
[0028] (2), etherification complex reaction:
[0029] After the reaction of oxidized starch is finished, the vacuum of the dry process reactor is released, and the mixture of alkali and 3-chloro-2 hydroxypropyl trimethyl ammonium chloride is directly sprayed, and the substitution degree of oxidized cationic sizing starch is 0.01-0.02, The dosage of 3-chloro-2 hydroxypropyl trimethyl ammonium chloride is 3%-4% of tapioca starch, and the molar ratio of 3-chloro-2 hydroxypropyl trimethyl ammonium chloride and alkali is 1.5-1.7; Stir after spraying th...
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