Preparation method of low-viscosity cation starch

A cationic starch and low-viscosity technology, which is applied in the field of starch denaturation, can solve problems such as difficulty in the fluidity of starch paste, reduction of positive charge or even negative charge of starch granules, so as to improve the efficiency of etherification reaction and shorten the reaction time of etherification , the effect of reducing dosage

Inactive Publication Date: 2012-07-18
广西农垦明阳生化有限公司
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AI Technical Summary

Problems solved by technology

Cationic surface sizing starch is usually prepared by combining cationization with acid denaturation or oxidation. The acid-modified starch paste is easy to gel, and the starch paste with better fluidity can be obtained by oxidation, but excessive oxidation will lead to a sharp increase in the positive charge of the starch granules. Reduce or even negatively charge, in order to ensure that the starch granules are positively charged, it is often necessary to reduce the degree of starch oxidation, but the fluidity of the obtained starch paste is difficult to meet the needs of high-concentration cooking gelatinization and high-concentration surface sizing

Method used

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  • Preparation method of low-viscosity cation starch

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Embodiment 1

[0033] 60m 3 Fresh tapioca starch milk with a concentration of 38% (or water and native starch mixed into starch milk), add 945kg of sodium sulfate, 310kg of calcium oxide, 27kg of urea, and 7.5kg of copper sulfate under stirring. Heat to 42℃ and add 2007kg of 3-chloro-2-hydroxypropyltrimethylammonium chloride activated by on-site alkali (use 637kg of 30% sodium hydroxide to activate 1370kg of 69% 3-chloro-2-hydroxypropyltrimethyl) Base ammonium chloride), keep 47~48℃, react for 2 hours; add 945kg hydrogen peroxide in continuous flow for oxidation reaction for 4 hours; then lower the temperature of starch suspension to 35℃, adjust the suspension PH=8.5 with hydrochloric acid, and continue to flow Add 1800kg of sodium hypochlorite solution and adjust the starch suspension PH=9.0~9.2 with 8% sodium hydroxide solution, keep it at 35~36℃, carry out oxidation reaction for 1.5 hours, adjust the suspension pH=6.5 with hydrochloric acid, add sodium sulfite 10.8kg, washed, dehydrated an...

Embodiment 2

[0035] 60m 3 Fresh tapioca starch milk with a concentration of 38% (or water and native starch mixed into starch milk), add 1215kg of sodium chloride, 230kg of calcium oxide, 162kg of sodium silicate, and 5.4kg of iron sulfate under stirring, and heat to 42 ℃, add 2178kg of 3-chloro-2-hydroxypropyltrimethylammonium chloride activated by in-situ alkali (use 691kg of 30% sodium hydroxide to activate 1487kg of 69% 3-chloro-2-hydroxypropyl Trimethylammonium chloride), keep at 49~50℃, react for 1.5 hours; add 1215kg of hydrogen peroxide in continuous flow for oxidation reaction for 4.5 hours; then reduce the temperature of the starch suspension to 33℃, adjust the suspension PH=8.5 with hydrochloric acid , Add 1350kg of sodium hypochlorite solution in continuous flow, and adjust the starch suspension PH=8.8~9.0 with potassium hydroxide solution with a concentration of 8%, keep it at 33~35℃, carry out oxidation reaction for 1 hour, adjust the suspension PH=6.5 with hydrochloric acid ,...

Embodiment 3

[0037] 60m 3 Fresh tapioca starch milk with a concentration of 38% (or water and native starch mixed into starch milk), add sodium sulfate 756kg, sodium chloride 270kg, calcium oxide 351kg, nickel sulfate 4kg in sequence under stirring, and heat to 42℃. Add 1749 kg of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride activated by on-site alkali (use 575 kg of 30% sodium hydroxide to activate 1174 kg of 69% 3-chloro-2-hydroxypropyl trimethyl ammonium chloride). Methyl ammonium chloride), keep at 50~51℃, react for 2.5 hours; add 1026kg hydrogen peroxide in continuous flow for oxidation reaction for 4 hours; then reduce the temperature of starch suspension to 35℃, adjust the suspension PH=8.5 with hydrochloric acid, continue Add 1463kg of sodium hypochlorite solution, while adjusting the starch suspension PH=8.8~9.0 with an alkaline catalyst, keep it at 35~37℃, carry out oxidation reaction for 1 hour and 20 minutes; then adjust the suspension pH=6.5 with hydrochloric acid, add h...

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Abstract

The invention relates to a preparation method of low-viscosity cation starch, comprising the following steps: 1) preparing native starch into a 35-40% starch suspension by clear water, successively adding an inhibitor, an activated viscosity breaking agent and a metal ion catalyst under the state of stirring, heating to 42DEG C, adding a cation etherifying agent activated by an alkaline activator, keeping the temperature of 42-52DEG C, and reacting for 0.5-3 hours; 2) continuously adding an oxidant A in a flowing mode, and reacting for 2-5 hours; 3) cooling to 30-35DEG C, adjusting pH to 8.5 by hydrochloric acid, continuously adding an oxidant B in a flowing mode, adjusting the pH of the starch suspension to 8.5-9.5 by a base catalyst, keeping the temperature of 30-38DEG C, and reacting for 0.5-1.5 hours; and 4) adjusting the pH of the suspension to 6.5 by the hydrochloric acid, adding a stabilizer, washing after 20 minutes, dewatering and drying to obtain the product. The starch particle has strong positive charge, paste has the characteristics of low viscosity, good rheological property and high adhesive strength and is used for high-density surface sizing for papermaking, and the surface strength and the printability of paper can be obviously improved.

Description

Technical field [0001] The invention belongs to the technical field of starch modification, and specifically relates to a preparation method of low-viscosity cationic starch. Background technique [0002] Cationic starch is used for paper surface sizing. Because of its positive charge and strong chemical affinity to fibers, the penetration rate of starch glue is slow, and the retention rate on paper is high, which can significantly improve the surface strength and printability of paper , Is conducive to the adsorption of negatively charged ink, the printed writing is clear, the color is more vivid, and the penetration is less. The cationic starch surface sizing paper can reduce the amount of wet end addition or surface sizing starch when the broken paper is recycled, and can significantly reduce the content of COD and BOD in the white water. Therefore, the use of cationic starch as a surface sizing agent has always been favored by the industry. Cationic surface sizing starch is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/08C08B31/18C08B31/12D21H21/16
Inventor 朱其虎韦爱芬潘瑞坚
Owner 广西农垦明阳生化有限公司
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