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Preparation method of amphipathic acrylic acid/maleic anhydride (AA/MA) grafted esterified hydroxypropyl cassava starch

A technology for esterifying hydroxypropyl tapioca and tapioca starch, which is applied in the field of preparation of amphiphilic AA/MA grafted esterified hydroxypropyl tapioca starch, can solve product viscosity, post-processing and drying, difficulty in crushing process, group Single and other problems, to achieve the effect of enhanced adsorption capacity

Inactive Publication Date: 2013-05-08
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

The corresponding hydrophobized modified starch has a relatively single group, and some non-aqueous solvents need to be used in the preparation process, which makes the production cost higher
However, the hydrophilic monomodified starch synthesized by using water as a solvent reaction is usually relatively viscous after the reaction, and the post-treatment, drying and crushing processes are relatively difficult, and the grafting efficiency is also low, which limits the industrial production and popularization of the product.

Method used

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  • Preparation method of amphipathic acrylic acid/maleic anhydride (AA/MA) grafted esterified hydroxypropyl cassava starch
  • Preparation method of amphipathic acrylic acid/maleic anhydride (AA/MA) grafted esterified hydroxypropyl cassava starch
  • Preparation method of amphipathic acrylic acid/maleic anhydride (AA/MA) grafted esterified hydroxypropyl cassava starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Dry tapioca starch in a vacuum oven at 50°C to constant weight to obtain dry base tapioca starch.

[0065] (2) Weigh 6g of tapioca starch on a dry basis obtained in step (1) into a four-necked flask, then add 20mL of analytically pure absolute ethanol, and stir evenly to form a starch suspension.

[0066] (3) Measure 5mL of 10% sodium hydroxide solution and add it to the cassava starch suspension obtained in step (2) within 10 minutes. After the dropwise addition, slowly raise the temperature to 40°C, and continue to stir and activate for 10 minutes.

[0067] (4) Take 2.5mL of analytically pure propylene oxide and add it to the reaction system obtained in step (3), stir evenly, heat up to 40°C, and react for 10 hours; then use analytically pure glacial acetic acid to adjust the pH of the system to 7 to obtain hydroxypropyl Tapioca starch solution.

[0068] (5) Adjust the temperature of the system obtained in step (4) to 50°C, and add 3.0 mL of analytically pure ben...

Embodiment 2

[0078] (1) Dry tapioca starch in a vacuum oven at 50°C to constant weight to obtain dry base tapioca starch.

[0079] (2) Weigh 8 g of tapioca starch obtained in step (1) on a dry basis into a four-neck flask, then add 30 mL of analytically pure absolute ethanol, and stir evenly to form a starch suspension.

[0080] (3) Measure 7mL of 10% sodium hydroxide solution and add it to the cassava starch suspension obtained in step (2) within 10 minutes. After the dropwise addition, slowly raise the temperature to 40°C, and continue to stir and activate for 10 minutes.

[0081] (4) Take 5 mL of analytically pure propylene oxide and add it to the reaction system obtained in step (3), stir evenly, heat up to 40°C, and react for 10 hours; then use analytically pure glacial acetic acid to adjust the pH of the system to 7 to obtain hydroxypropyl cassava starch solution.

[0082] (5) Adjust the temperature of the system obtained in step (4) to 50°C, and add 6.0 mL of analytically pure benz...

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Abstract

The invention discloses a preparation method of amphipathic acrylic acid / maleic anhydride (AA / MA) grafted esterified hydroxypropyl cassava starch. The preparation method comprises the following steps of: taking cassava starch as a major raw material and anhydrous ethanol as a solvent, carrying out an etherification reaction with propylene epoxide in an alkaline medium to obtain hydroxypropyl cassava starch; synthesizing esterified hydroxypropyl starch by taking benzoyl chloride as an esterifying agent, and implementing graft copolymerization on esterified hydroxypropyl starch and a monomer solution obtained by the neutralization of acrylic acid and ethidene diamine so as to synthesize the amphipathic AA / MA grafted esterified hydroxypropyl cassava starch. For the amphipathic AA / MA grafted esterified hydroxypropyl cassava starch, the substitution ratio of hydroxypropyl is 0.18-0.36, the substitution ratio of esterification is 0.089-0.12, and the grafting efficiency and the conversion ratio of a monomer are respectively 44.0% and 63.4%. According to the preparation method disclosed by the invention, propylene epoxide and acrylic acid are adopted as hydrophilic groups to modify the cassava starch, and then benzoyl, methyl acrylate and other hydrophobic groups are bonded, so that the amphipathic AA / MA grafted esterified hydroxypropyl cassava starch simultaneously has negative ions and hydrophobic groups and can be widely applied to fields of environmental protection, ecological repair, water treatment, heavy metal absorption and the like by being taken as an environment material.

Description

technical field [0001] The invention relates to a preparation method of amphiphilic AA / MA grafted esterified hydroxypropyl tapioca starch. Background technique [0002] Raw starch can further increase the active groups on the starch structural units through etherification, esterification, oxidation, grafting, crosslinking and other unit or multiple compound denaturation reactions to meet the requirements of some conventional and special application fields. Amphiphilic starch is mainly a starch derivative obtained by introducing hydrophobic groups into starch molecules or introducing lipophilic polymer chains through esterification, etherification, grafting and other reactions. The hydrophobic groups contained in its structure can reduce the water solubility of starch and increase the adsorption performance of starch to some water-insoluble and hydrophobic substances. [0003] There are many methods for hydrophobizing modification of native starch. Due to the difficulty in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08B31/16
Inventor 李和平杨永哲张垚吕虎强杨官威胡杨黄云燕袁金伟秦东霞
Owner 建湖上冈产业园服务有限公司
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