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Method for preparing double-crosslinking amphoteric tapioca starch

A tapioca starch and double cross-linking technology is applied in the field of preparation of double cross-linked amphoteric tapioca starch, which can solve the problems of application limitation and less research and development of cross-linked amphoteric starch, and achieves a product with good application effect, high stability and high application value. Effect

Active Publication Date: 2012-07-25
建湖上冈产业园服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, quaternary amine etherifying agents are widely used in industry, while tertiary amine etherifying agents such as 2-diethylaminoethyl chloride (DEC) are cationic only under acidic conditions. App is restricted
[0003] At home and abroad, some progress has been made in the modification of cross-linked cationic and cross-linked anionic starches, but there are few domestic and foreign reports on the research and development of cross-linked amphoteric starches.
However, double cross-linked amphoteric starch has been rarely reported at home and abroad.

Method used

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  • Method for preparing double-crosslinking amphoteric tapioca starch
  • Method for preparing double-crosslinking amphoteric tapioca starch
  • Method for preparing double-crosslinking amphoteric tapioca starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) drying the tapioca starch to a constant weight in a 60°C vacuum drying oven to obtain dry base tapioca starch;

[0038] (2) Weigh 10g of dry base tapioca starch obtained in step (1) and deionized water into the reactor to prepare a starch solution with a mass fraction of 30% to 35%;

[0039] (3) 25g of dimethyl diallyl ammonium chloride cationic monomer and 0.3g of N,N'-methylenebisacrylamide were added to the starch solution obtained in step (2), and stirred for 15 minutes;

[0040] (4) Weigh 0.05g of ammonium persulfate and 0.05g of sodium bisulfite respectively and dissolve in 10mL of deionized water;

[0041] (5) when the material obtained in step (3) is heated to 40° C., the solution in step (4) is controlled to be added dropwise to the material obtained in step (3) within 30 minutes with a constant pressure dropping funnel, and the reaction is continued for 5 hours. Cool the system temperature to 30°C;

[0042] (6) take by weighing 0.1g epichlorohydrin and 0...

Embodiment 2

[0050] (1) drying the tapioca starch to a constant weight in a 60°C vacuum drying oven to obtain dry base tapioca starch;

[0051] (2) weighing 20 g of dry base tapioca starch obtained in step (1) and deionized water into the reactor to prepare a starch solution with a mass fraction of 30% to 35%;

[0052] (3) 35g of dimethyl diallyl ammonium chloride cationic monomer and 0.6g of N,N'-methylenebisacrylamide were added to step (2) starch solution, stirred for 15 minutes;

[0053] (4) Weigh 0.12g of ammonium persulfate and 0.12g of sodium bisulfite respectively and dissolve in 10mL of deionized water;

[0054] (5) when the obtained product of step (3) is heated to 40° C., the solution of step (4) is controlled to be added dropwise to the obtained material of step (3) within 30 minutes with a constant pressure dropping funnel, and the reaction is continued for 6 hours. Cool the system temperature to 30°C;

[0055] (6) take by weighing 0.2g epichlorohydrin and 0.3g sodium hydrox...

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Abstract

The invention discloses a method for preparing double-crosslinking amphoteric tapioca starch. The method includes: using tapioca starch as main materials, water as solvent, hydroxide 1-butyl-3-methyl imidazole and sodium hydroxide as catalysts for etherification reaction, and N, N'-methylene bisacrylamide as inner-crosslinking agent to enable the starch to be in a meshed form, and preparing double-crosslinking amphoteric tapioca starch by means of outer crosslinking of epichlorohydrin and modification of amphoteric agent such as dimethyl diallyl ammonium chloride cation monomers, monochloro acetic acid and the like to enable the tapioca starch to integrate advantages of crosslinking starch and amphoteric starch. The double-crosslinking amphoteric tapioca starch has high application value in papermaking auxiliaries, cosmetics and the like. Further, since the double-crosslinking amphoteric tapioca starch is swellable in water but insoluble, application of the double-crosslinking amphoteric tapioca starch in sewage treatment is more effective.

Description

technical field [0001] The invention relates to a preparation method of double-crosslinked amphoteric tapioca starch. Background technique [0002] my country is rich in cassava starch resources. In practical applications, the structure of natural cassava starch can be modified and denatured to change its inherent properties or broaden its application fields. Amphoteric modified starch has more superior performance than single modified starch derivatives because it has both anionic and cationic groups. Some types of amphoteric starch products have been developed abroad, such as CAT073-8002, CAT078-0140, CATOXX-0220 produced by the National Starch and Chemical Company in the United States and Y9152 produced by the British Stadex Company. Domestic reports on amphoteric starch are mainly amphoteric starch used in the paper industry. Generally, the synthesis methods of amphoteric starch are divided into three categories: wet method, dry method and semi-dry method according to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12C08F251/00C08F226/02C08F222/38
Inventor 李和平吕虎强文雯杨永哲张垚杨官威胡杨
Owner 建湖上冈产业园服务有限公司
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