Amphoteric starch for AKD emulsification and preparation method and applications thereof

An amphoteric starch, starch technology, applied in textiles and papermaking, water repellent addition, paper and other directions, can solve the problems of emulsion surface crusting, poor emulsion stability, poor stability, etc., and achieve uniform size distribution, low cost, and reaction conditions. mild effect

Active Publication Date: 2019-04-19
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

But when cationic starch is used as AKD emulsifier, the stability of the prepared emulsion when its consumption is lower than 25% (relative to AKD wax) is poor, and after standing for a period of time, the phenomenon of crusting will appear on the emulsion surface, so There are defects of large dosage and poor stability

Method used

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  • Amphoteric starch for AKD emulsification and preparation method and applications thereof

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Experimental program
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Effect test

Embodiment 1

[0031] A kind of preparation method of amphoteric starch for AKD emulsification of the present embodiment, the steps are as follows:

[0032] (1) 50 parts by weight of starch (tapioca starch) with a water content between 5% and 15% are added to a mixed solution of 100 parts by weight of water and an organic solvent (the weight ratio is 20:80, and the organic solvent is isopropanol) After stirring evenly, slowly add 5 parts by weight of alkali (sodium hydroxide) into the solution, and stir for 60 minutes.

[0033] (2) Heat the solution to 70°C. After the temperature stabilizes, add 8 parts by weight of cationic etherification agent (3-chloro-2-hydroxypropyl-trimethylammonium chloride) dropwise to the solution, and continue stirring for 3 Hour.

[0034] (3) Add 1 part by weight of a viscosity reducer (30% aqueous hydrogen peroxide solution by volume) to the solution, and continue to stir and react for 1.5 hours.

[0035] (4) Add 3 parts of anionic etherification agent (succini...

Embodiment 2

[0038] A kind of preparation method of amphoteric starch for AKD emulsification of this embodiment, the raw material and preparation method that it adopts are the same as embodiment 1, difference is:

[0039] In step (4), the anionic etherification agent used is sodium chloroacetate.

Embodiment 3

[0041] A kind of preparation method of amphoteric starch for AKD emulsification of this embodiment, the raw material and preparation method that it adopts are the same as embodiment 1, difference is:

[0042] In step (4), the cationic etherification agent used is 2,3-epoxypropyl-trimethylammonium chloride.

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Abstract

The invention relates to an amphoteric starch for AKD emulsification and a preparation method and applications thereof. The preparation method comprises following steps: (1) adding starch into a solvent, then adding an alkali, and stirring for 30 to 120 minutes; (2) heating the reaction solution obtained in the step (1) to a temperature of 40 to 80 DEG C, then adding an cationic etherifying agent,carrying out reactions for 1 to 10 hours, adding a viscosity reducer, and carrying out reactions for 0.5 to 3 hours; and (3) adding an anionic etherifying agent into the reaction solution obtained inthe step (2), adjusting the pH value of the reaction solution to 9-14 by adding an alkali, carrying out reactions for 1 to 6 hours at a temperature of 40 to 80 DEG C; carrying out neutralization, washing, and drying to obtain the amphoteric starch. The prepared amphoteric starch has the advantage that the using amount of an emulsifying agent is greatly reduced during the AKD emulsification process. Moreover, the prepared AKD emulsion has the characteristics of uniform particle size distribution and good stability and can be stably stored for six months at a room temperature.

Description

technical field [0001] The invention relates to the technical field of modified starch, in particular to an amphoteric starch for AKD emulsification and a preparation method and application thereof. Background technique [0002] Amphoteric starch refers to the modified starch that has both cationic groups and anionic groups in the same starch chain. It has four characteristics of cationic starch, anionic starch, natural polymer and synthetic polymer. Compared with cationic starch and anionic starch, amphoteric starch has unique electrochemical properties and the synergistic effect between anion and cation, and has stronger anti-acid and anti-alkali ability. As an additive in the wet end of the paper industry, its effect is better than that of cationic or anionic starch alone, and when 0.05% to 1% amphoteric starch is added, it can significantly improve the drainage efficiency in the paper industry and increase the retention rate of fibers. However, there is no report on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12D21H21/16D21H17/29
CPCC08B31/12D21H17/29D21H21/16
Inventor 李养令郭子腾户献雷任少华赵经纬
Owner GUANGZHOU TINCI MATERIALS TECH
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