Method for preparing amphoteric starch

An amphoteric starch and starch technology, applied in the field of starch modification, can solve the problems of easy loss, unstable product performance, etc., and achieve the effects of easy biodegradation, wide application range and wide source of raw materials

Inactive Publication Date: 2012-07-18
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] There are disadvantages when connecting functional groups to the starch backbone through ester bonds or ether bonds. For example, ester bonds or ether bonds are easily hydrolyzed in heating, acid or alkali environments, and these groups are easy to lose, which makes the product performance unstable.

Method used

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  • Method for preparing amphoteric starch
  • Method for preparing amphoteric starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 (Simultaneous grafting of anion and cation monomers)

[0032] Mix 20 grams of cornstarch (dry basis) with 200 milliliters of distilled water evenly, gelatinize at 85°C for 30 minutes, and lower the temperature to room temperature. Add 4.69 grams of acrylamide (0.066mol), 10.80 grams of methacryloyloxyethyltrimethylammonium chloride (0.052mol), 6.21 grams of sodium acrylate (0.066mol), and 0.2 grams of cerium ammonium nitrate in sequence, and stir evenly. The air was purged with nitrogen gas for 30 minutes. Then the temperature was raised to 55° C., and the reaction was carried out for 3 hours. Cooling to room temperature afforded a viscous crude product. The crude product was baked in a constant temperature oven at 130°C for 2 hours, cooled to room temperature, pulverized, and dried in a vacuum oven at 50°C until constant weight. Cross 100 mesh sieves to obtain amphoteric starch powder.

[0033] Purification method: take the amphoteric starch powder as th...

Embodiment 2

[0037] Example 2 (Graft cationic monomer first, then graft anionic monomer)

[0038] After mixing 30 g of soluble cornstarch with 50 ml of distilled water, 3.55 g of vinylbenzyltributylphosphonium chloride (0.010 mol), 1.78 g of acrylamide (0.025 mol), and 0.1 g of potassium persulfate were added in sequence. After mixing evenly, heat up to 50°C, add 5 ml of aqueous solution containing 0.1 g of sodium bisulfite, and react for 3.5 hours. Then, 1.03 g of sodium acrylate (0.011 mol), 1.78 g of acrylamide (0.025 mol), and 0.1 g of potassium persulfate were added. After mixing evenly, heat up to 55°C, add 5 ml of aqueous solution containing 0.1 g of sodium bisulfite, and react for 3.5 hours.

[0039] Cooling to room temperature afforded wet crude product. The crude product was baked in a constant temperature oven at 130°C for 2 hours, cooled to room temperature, pulverized, and dried in a vacuum oven at 50°C until constant weight. Cross 100 mesh sieves to obtain amphoteric starc...

Embodiment 3

[0041] Example 3 (Graft anion first, then graft cation)

[0042] After mixing 30 grams of potato starch evenly with 400 milliliters of distilled water, gelatinize at 85° C. for 20 minutes, and lower the temperature to room temperature to obtain starch paste. 10.34 g of sodium acrylate (0.110 mol), 7.11 g of acrylamide (0.100 mol), and 0.1 g of ammonium persulfate were added. After mixing evenly, the temperature was raised to 40° C., 5 ml of an aqueous solution containing 0.1 g of sodium sulfite was added, and the mixture was reacted for 4 hours. Then, 4.15 g of p-vinylbenzyltriphenylphosphonium chloride (0.010 mol), 16.17 g of dimethyldiallylammonium chloride (0.100 mol) and 7.11 g of acrylamide (0.100 mol), 0.1 g of over Ammonium sulfate, after mixing evenly, raised the temperature to 40°C, added 5 ml of aqueous solution containing 0.1 g of sodium sulfite, and reacted for 4 hours.

[0043] Cooling to room temperature afforded a viscous crude product. The crude product wa...

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Abstract

The invention discloses a method for preparing amphoteric starch. The method comprises the following steps of: (1) weighing the following raw material components by mass weight: 1 percent of starch, 0.1 to 2 percent of cationic monomer, 0.1 to 2 percent of anionic monomer, 0.1 to 2 percent of acrylamide and 0.1 to 20 percent of water, and weighing an initiator in an amount which is 0.1 to 3 percent of the total weight of the cationic monomer, the anionic monomer and the acrylamide; (2) pasting the starch by using the water, then adding the cationic monomer, the anionic monomer, acrylamide andthe initiator, and reacting for 0.5 to 10 hours at the temperature of 25-80 DEG C; and (3) cooling and drying, thus obtaining the amphoteric starch. The method has the characteristics of wide raw material source, simple process and the like, and is easy to biodegrade. The prepared amphoteric starch has the characteristics of anionic starch and cationic starch, is wide in application range, and can be used in neutral, acid and alkali media. Moreover, in different media, the carried ion type is different, and the amphoteric starch is particularly suitable for treating pollutants with different charges.

Description

[0001] technical field [0002] The invention relates to the technical field of starch modification, in particular to a preparation method of amphoteric starch, in which the side group and / or side chain of a cation is connected to the backbone of the starch chain, and the side of a carboxylate or sulfonate anion is connected groups and / or side chains. The amphoteric starch produced by this technology can be used in industries and fields such as papermaking, textiles, chemicals, pharmaceuticals, petroleum, environmental protection, agriculture and mining. Background technique [0003] Amphoteric starch refers to the modified starch with cationic groups and anionic groups in the same starch chain, which 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/34C08F230/02C08F220/06C08F220/56
Inventor 宋伟强赵志伟刘国勤魏凤春苗蔚栗政新
Owner HENAN UNIVERSITY OF TECHNOLOGY
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