Preparation method of cationic starch

A technology of cationic starch and cationic etherifying agent, which is applied in the field of starch modification, can solve the problems of retention and drainage aid and the insignificant effect of paper-forming strength, so as to improve water retention and drainage performance, improve paper strength performance, molecular chain Distributed effect

Inactive Publication Date: 2017-05-03
GOLD EAST PAPER JIANGSU
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The study found that simply cationic etherification modification of starch has no obvious effect on further improving retention and drainage and paper strength, so it is necessary to find a new starch preparation technology

Method used

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  • Preparation method of cationic starch
  • Preparation method of cationic starch
  • Preparation method of cationic starch

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preparation example Construction

[0022] Such as figure 1 , the embodiment of the present invention provides a kind of preparation method of cationic starch, comprising:

[0023] Step S101: mixing raw starch with water to prepare a raw starch suspension;

[0024] The original starch can be one or more of cassava original starch, corn original starch, potato original starch, and wheat original starch; in the embodiment of the present invention, a certain amount of original starch is added to a certain amount of water, and Stir to disperse the original starch evenly in the water to obtain a starch suspension.

[0025] Step S102: adding a predetermined amount of basic catalyst, cationic etherification agent and crosslinking agent to the raw starch suspension, and reacting under the first predetermined condition to obtain a mixed solution;

[0026] In the embodiment of the present invention, the basic catalyst, the cationic etherifying agent and the crosslinking agent can be added to the starch suspension respec...

Embodiment 1

[0051] Take by weighing 348.8g cassava raw starch (moisture content 14%) and add into 401.2g water under stirring state, stir evenly, obtain the raw starch suspension that solid content is 40%. Add NaCl expansion inhibitor to the uniformly dispersed above-mentioned raw starch suspension, the amount of expansion inhibitor added is 5% of the dry mass of cassava raw starch, stir evenly, and then add a sodium hydroxide solution with a concentration of 25% to pre-activate 3-chloro-2-hydroxypropyltrimethylammonium chloride solution (concentration is 70%), wherein the sodium hydroxide solution consumption is 1.5% of the absolute dry mass of native tapioca starch, and the etherifying agent 3-chloro-2- The dosage of the hydroxypropyltrimethylammonium chloride solution is 10% of the absolute dry mass of the original tapioca starch, and at the same time, 1% glyoxal with a mass of 1% of the absolute dry mass of the original tapioca starch is added, and the temperature is raised to 45° C. f...

Embodiment 2

[0053] Take by weighing 348.8g cassava raw starch (moisture content 14%) and add into 401.2g water under stirring state, stir evenly, obtain the raw starch suspension that solid content is 40%. Add Na to the above-mentioned raw starch suspension that is uniformly dispersed 2 SO 4 Swelling inhibitor, the amount of swelling inhibitor added is 3% of the absolute dry mass of the original tapioca starch, stir evenly, then add the glycidyltrimethylammonium chloride solution that is preactivated by the sodium hydroxide solution with a concentration of 30% (concentration is 70%), wherein the sodium hydroxide solution consumption is 1% of the absolute dry mass of the original tapioca starch, and the etherifying agent epoxypropyl trimethyl ammonium chloride solution consumption is 5% of the original tapioca starch absolute dry mass, At the same time, 0.1% glyoxal with a mass of 0.1% of the absolute dry mass of the raw cassava starch was added, and the temperature was raised to 43° C. f...

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Abstract

The invention discloses a preparation method of cationic starch. The preparation method comprises following steps: native starch is mixed with water so as to obtain a native starch suspension; certain amounts of a basic catalyst, a cationic etherifying agent, and a cross-linking agent are added into the native starch suspension, and reaction is carried out under first preset conditions so as to obtain a mixed solution; a preset amount of a plasticizer is added into the mixed solution, and gelatinization is carried out under second preset conditions so as to obtain the cationic starch. The preparation method is capable of improving retention properties and drainability of pulp, and increasing paper strength therefore.

Description

technical field [0001] The invention relates to the technical field of starch modification, in particular to a preparation method of cationic starch. Background technique [0002] In the paper industry, retention and drainage aids are often added to the slurry to increase the retention rate of fine fibers and fillers in the slurry and improve the drainage performance, thereby increasing the ash content and paper strength of the paper. At present, there are many types of retention and drainage aids, among which cationic starch is widely used. However, as the speed of paper machines continues to increase, the ratio of short-fiber hardwood pulp, chemical-mechanical pulp and recycled pulp to replace long-fiber pulp increases, and the demand for paper ash content increases. To ensure better physical properties of paper, pulp must have Better retention of water filtration performance. The study found that simply cationic etherification modification of starch has no obvious effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12
Inventor 陈杰於旺盛李俊刘春
Owner GOLD EAST PAPER JIANGSU
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