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Preparation method for cross-linked amphoteric starch

A technology of amphoteric starch and starch, which is applied in the field of starch modification, can solve the problems of complex process, high price of cationization and anionization reagents, and achieve the effect of simple process, low cost and low price

Inactive Publication Date: 2019-01-25
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing cross-linked amphoteric starch, which solves the problems in the prior art that the preparation technology of amphoteric starch is complicated, and the price of cationization and anionization reagents used in the preparation is relatively high. At the same time, the method prepares The cross-linked amphoteric starch is not only easy to separate from wastewater, but also has good adsorption properties for dyes

Method used

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  • Preparation method for cross-linked amphoteric starch

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preparation example Construction

[0021] A preparation method of cross-linked amphoteric starch, specifically implemented according to the following steps:

[0022] Step 1. Weigh the starch and water according to the mass ratio of starch and water of 0.05-0.1:1, disperse the starch into water, stir and disperse at 70-90°C for 0.5-2h, and obtain gelatinized starch, wherein, starch Any one of potato starch, corn starch, sweet potato starch, tapioca starch, wheat starch, mung bean starch;

[0023] Step 2, add cationic monomer and anionic monomer to gelatinized starch, after stirring for 30min, obtain mixture A, wherein, the mass ratio of cationic monomer and water and the mass ratio of anionic monomer and water are 0.01-0.05: 1; The cationic monomer is any one of methacryloyloxyethyltrimethylammonium chloride, acryloyloxyethyltrimethylammonium chloride, and dimethyldiallylammonium chloride; the anionic monomer The body is any one of sodium acrylate, potassium acrylate, and acrylic acid;

[0024] Step 3. Add a c...

Embodiment 1

[0027] A preparation method of cross-linked amphoteric starch, specifically implemented according to the following steps:

[0028] Step 1. Add 5g of potato starch to 100g of water, stir and disperse at 90°C for 0.5h to obtain gelatinized starch;

[0029] Step 2, adding 1 g of methacryloyloxyethyltrimethylammonium chloride and 1 g of sodium acrylate to the gelatinized starch, and stirring for 30 minutes to obtain a mixture A;

[0030] Step 3. Add 0.1g of N,N-methylenebisacrylamide to the mixture A, add 0.1g of potassium persulfate after mixing evenly, stir and react at 40°C for 48h, and obtain a gel-like product;

[0031] Step 4: Soak and wash the gel-like product with deionized water for 5 times, and dry to constant weight to obtain cross-linked amphoteric starch.

Embodiment 2

[0033] A preparation method of cross-linked amphoteric starch, specifically implemented according to the following steps:

[0034] Step 1. Add 10g of cornstarch to 100g of water, stir and disperse at 70°C for 2 hours to obtain gelatinized starch;

[0035] Step 2. Add 5g of acryloyloxyethyltrimethylammonium chloride and 5g of potassium acrylate to the gelatinized starch, and stir for 30min to obtain mixture A;

[0036] Step 3. Add 0.4 g of divinylbenzene to the mixture A, add 0.5 g of ammonium persulfate after mixing evenly, and stir and react at 80°C for 24 hours to obtain a gel-like product;

[0037] Step 4. Soak and wash the gel-like product 10 times with deionized water, and dry to constant weight to obtain cross-linked amphoteric starch.

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Abstract

The invention discloses a preparation method for cross-linked amphoteric starch, which is specifically implemented according to the following steps: starch is firstly dispersed into water, so that gelatinized starch is obtained; the gelatinized starch is then added with cationic monomer and anionic monomer and agitated for 30 minutes, a cross-linking agent and an initiator then continously are added, reaction temperature is controlled at 40 DEG C to 80 DEG C, and after 24 to 48 hours of agitation, a gelatinous product is obtained; finally, deionized water is then used for soaking and washingthe gelatinous product, and the gelatinous product is dried until weight is constant, so that the cross-linked amphoteric starch is obtained. The technique adopted by the method is simple and easy toimplement, the prices of the used materials are low, and the cost is low; moreover, because the cross-linked amphoteric starch prepared by the method cannot be dissolved into water, the cross-linked amphoteric starch can be easily separated from treated wastewater, and thereby the treatment cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of starch modification and relates to a preparation method of crosslinked amphoteric starch. Background technique [0002] Amphoteric starch refers to starch with both cationic and anionic substituents. Compared with general cationic or anionic starch, amphoteric starch has both cationic and anionic groups on the same starch molecule. The chemical properties, as well as the synergistic effect of anion and cation, can simultaneously remove anion and cation pollutants in wastewater, and has good acid and alkali resistance, so it has a wide range of applications and has attracted much attention. The high cost limits its application. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing cross-linked amphoteric starch, which solves the problems in the prior art that the preparation technology of amphoteric starch is complicated, and the price of cationizat...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F222/38C08F212/36C08F251/00C08F220/06C08F220/34
CPCC08F285/00C08F251/00C08F222/385C08F212/36C08F220/34C08F220/06
Inventor 张彩宁王煦漫宋美娟段凯迪
Owner XI'AN POLYTECHNIC UNIVERSITY
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