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A kind of preparation method of composite starch

A composite starch technology, which is applied in the field of starch denaturation, can solve the problems of uneven reaction, paste web sticking to rolls, and reduce filler retention, so as to improve the degree of cationization, improve running performance, and reduce the loss rate.

Active Publication Date: 2017-11-07
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The application effect of cationic starch on the wet end has a lot to do with its dosage. When it is used to improve the strength, its dosage is generally relatively high; but when the dosage of cationic starch is too high, it will not only have a negative impact on pulp dehydration, but also disturb the wetness. The charge balance system of the terminal system can reduce the retention of fillers, which will cause the phenomenon of paper machine sticking to the roll, etc., which will have a negative impact on the normal operation of the paper machine, and when the amount of cationic starch added is too high, its loss rate will also increase, resulting in waste water The increase in the value of Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD), and the difficulty of wastewater treatment, etc.
In addition, there is a problem of uneven reaction in the traditional dry cationic starch production process

Method used

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  • A kind of preparation method of composite starch
  • A kind of preparation method of composite starch
  • A kind of preparation method of composite starch

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preparation example Construction

[0038] refer to figure 1 , the embodiment of the present invention provides a kind of preparation method of composite starch, comprising:

[0039] Step S101: providing raw starch, etherification agent and catalyst;

[0040] In the embodiment of the present invention, the cationic modification is carried out on the native starch. The etherification agent is an amine compound, which is used to react with the native starch to make the native starch molecules have cationic groups. The catalyst is generally an alkaline substance.

[0041] Step S102: using a dry method to prepare cationic starch, mixing raw starch, etherification agent and catalyst to form a reaction system for reaction, and at the same time, before the raw starch is converted into cationic starch that meets predetermined requirements, there are inorganic particles in the reaction system;

[0042] The process of preparing cationic starch by dry method is generally to dilute the etherifying agent and catalyst with w...

Embodiment approach 1

[0081] 15 parts by mass of ground calcium carbonate were pre-mixed with 6 parts by mass of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 15 parts by mass of sodium hydroxide to obtain a second mixture, and then the second mixture was mixed with 100 parts by mass of The original potato starch was mixed, and the complex starch was prepared by dry method for preparing cationic starch, wherein the reaction temperature in the reaction vessel was 80 degrees Celsius.

Embodiment approach 2

[0083] The raw corn starch of 100 mass parts is pre-mixed with 1 mass part of precipitated calcium carbonate to obtain the first mixture, then the first mixture is mixed with 2 mass parts of methylene dimethylamine sulfate and 6 mass parts of sodium hydroxide, and The composite starch is prepared through the process of preparing cationic starch by dry method, wherein the reaction temperature in the reaction vessel is 30 degrees centigrade.

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Abstract

The invention discloses a method for preparing composite starch, which includes providing raw starch, an etherification agent and a catalyst; adopting a dry method to prepare cationic starch, and mixing the raw starch, etherification agent and catalyst into a reaction system for reaction , at the same time, before the original starch is converted into cationic starch that meets the predetermined requirements, there are inorganic particles in the reaction system; in the reaction system with inorganic particles, the original starch continues to be transformed into cationic starch, After being transformed into the cationic starch that meets the predetermined requirements, the composite starch is obtained. Through the above method, the present invention can improve the uniformity of the reaction, and at the same time, when the amount of cationic starch is high, it can improve the running performance of the paper machine and reduce the loss rate of the composite starch.

Description

technical field [0001] The invention relates to the technical field of starch denaturation, in particular to a preparation method of composite starch. Background technique [0002] Cationic starch is a nitrogen-containing derivative formed by the reaction of the hydroxyl group of glucose molecules on starch and amine compounds under the catalysis of a catalyst. Because it contains positively charged groups, it is generally used in the wet end of papermaking. [0003] The application effect of cationic starch on the wet end has a lot to do with its dosage. When it is used to increase the strength, its dosage is generally relatively high; but when the dosage of cationic starch is too high, it will not only have a negative impact on pulp dehydration, but also disturb the wetness of the pulp. The charge balance system of the terminal system can reduce the retention of fillers, which will lead to the phenomenon of paper machine sticking rolls, etc., which will have a negative imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/08C08K3/22C08K3/26C08K3/34C08B31/08
Inventor 周仁娟韦丹李俊芦海
Owner GOLD EAST PAPER JIANGSU