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Method for preparing carboxy-type amphoteric starch in one step by semi-dry process

A technology of amphoteric starch and semi-dry method, which is applied in the field of additives in the papermaking industry. It can solve the problems of sewage discharge reaction efficiency and uneven reaction, and achieve the effects of reducing white water treatment load, improving physical strength and high conversion rate.

Active Publication Date: 2016-11-30
抚州新天下知识产权咨询管理有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, carboxy-type amphoteric starch is mostly produced by wet end or dry process at home and abroad. In the wet process, there are shortcomings such as a large amount of sewage discharge and low reaction efficiency, while in the dry process, there are shortcomings such as uneven reaction.

Method used

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  • Method for preparing carboxy-type amphoteric starch in one step by semi-dry process
  • Method for preparing carboxy-type amphoteric starch in one step by semi-dry process
  • Method for preparing carboxy-type amphoteric starch in one step by semi-dry process

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Embodiment 1

[0042] main ingreadient

[0043] (1) Corn starch:

[0044] Appearance: white powder; Moisture: ≤14.0%; Fineness (100 mesh screening rate): ≧99.5%; Spots: ≤2.0 / ㎝ 2 ;PH value (10% aqueous solution): 6-7; Ash content (dry basis): ≤0.20%; Protein (dry basis): ≤0.50%; Whiteness: ≧85.0%;

[0045] (2) Sodium hydroxide (industrial pure);

[0046] (3) Etherifying agent: 3-chloro-2-hydroxypropyl-trimethylammonium chloride (purity 69%);

[0047] (4) Monochloroacetic acid (purity 98%).

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Abstract

The invention discloses a method for preparing carboxyl-type amphoteric starch in one step by a semi-dry process, which is characterized in that: firstly adding a cationic reagent 3-chloro-2-hydroxypropyl-trimethylammonium chloride to carry out etherification reaction on the original starch, After the etherification reaction, directly add the anionizing reagent monochloroacetic acid to carry out the carboxymethylation reaction. Both anionization and cationization reactions are carried out in one kettle to prepare carboxy-type amphoteric starch in one step, and the production process is uninterrupted. The invention can effectively solve the shortcomings of wet process and dry process. Cationic and anionic groups are connected in the same starch chain, so that the product has the characteristics of cationic starch and anionic starch, and various performances are improved; the reaction time can be shortened from 8 hours to 6 hours; due to the shortened process, energy saving and consumption reduction, so that The product cost can be saved by about 12%.

Description

technical field [0001] The invention belongs to the technical field of papermaking industrial additives, in particular to a method for preparing carboxyl amphoteric starch in one step by a semi-dry process. Background technique [0002] Amphoteric starch is a carboxy-type amphoteric starch used as a wet-end additive in the paper industry. It is an important type of multivariate modified starch. A new type of starch derivative developed on the basis of cationic modified starch. Compared with the usual anionic and cationic modified starches, it has unique electrochemical properties and the synergistic effect of anions and cations. It can be used as an auxiliary agent in papermaking industry, with anti-aging and anti-ion interference, and can be compounded with other auxiliary agents It is also widely used in textile, water treatment, food, medicine and other industrial fields. Compared with cationic and anionic starches, it has wider applications and better performance, so i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/12
Inventor 杨小东魏思李小倩
Owner 抚州新天下知识产权咨询管理有限公司
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