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A kind of method of oxidation-esterification composite modified starch

A technology of oxidized starch and compound modification, which is applied in the field of oxidation-esterification compound modified starch, which can solve the problems of unrecyclable and large pollution, and achieve the effect of improving application value, low viscosity and high film-forming property

Active Publication Date: 2021-02-23
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for oxidation-esterification composite modified starch. Compared with the prior art, the composite starch prepared by the present invention takes cornstarch, nano-microcrystalline cellulose, oxidizing agent and esterification agent as main raw materials , the preparation process is simple, environmentally friendly, and has a wide range of applications; in view of the shortcomings of ordinary catalysts such as large pollution and inability to recycle, the present invention uses nanocellulose as the catalyst with the advantages of no pollution, degradability, and strong effects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of oxidation-esterification composite modified starch, comprising the following steps:

[0031] Step 1) Preparation of oxidized starch: at normal temperature, 30g cornstarch is dissolved in deionized water to prepare 30wt% starch milk, and 0.5wt% (relative to the absolute dry starch quality, the same below) catalyst nano-microcrystalline cellulose is added In the starch solution, heat in a water bath at 50°C and stir for 0.5 h to make it evenly mixed, adjust the pH of the reaction system to 9 with 0.1 mol / L NaOH, and add sodium hypochlorite with an amount of available chlorine of 8 wt% to react for 4 h, then adjust the pH of the reaction system After the reaction is terminated, it is washed and centrifuged repeatedly with absolute ethanol and deionized water, dried and ground to obtain oxidized starch.

[0032] Step 2) Preparation of oxidized-esterified starch: the oxidized starch prepared in 20g step 1) is made into starch milk with a concentration...

Embodiment 2

[0034] A preparation method of oxidation-esterification composite modified starch, comprising the following steps:

[0035] Step 1) Preparation of oxidized starch: at normal temperature, dissolve 30g of cornstarch in deionized water to prepare 30wt% starch milk, add 0.5wt% catalyst nano-microcrystalline cellulose into the starch solution, heat and stir in a water bath at 50°C 0.5h to make it mix evenly, adjust the pH of the reaction system to be 9 with 0.1mol / L NaOH, and add sodium hypochlorite with an amount of available chlorine of 8wt% to react for 4h, adjust the pH of the reaction system to neutral, terminate the reaction with absolute ethanol Wash and centrifuge repeatedly with deionized water, dry and grind to obtain oxidized starch.

[0036] Step 2) Preparation of oxidized-esterified starch: the oxidized starch prepared in 20g step 1) is made into starch milk with a concentration of 30wt%, and moved into a three-necked flask, and 0.3wt% of catalyst nanocrystalline cellu...

Embodiment 3

[0038] A preparation method of oxidation-esterification composite modified starch, comprising the following steps:

[0039] Step 1) Preparation of oxidized starch: at normal temperature, dissolve 30g of cornstarch in deionized water to prepare 30wt% starch milk, add 0.5wt% catalyst nano-microcrystalline cellulose into the starch solution, heat and stir in a water bath at 50°C 0.5h to make it mix evenly, adjust the pH of the reaction system to be 9 with 0.1mol / L NaOH, and add sodium hypochlorite with an amount of available chlorine of 8wt% to react for 4h, adjust the pH of the reaction system to neutral, terminate the reaction with absolute ethanol Wash and centrifuge repeatedly with deionized water, dry and grind to obtain oxidized starch.

[0040] Step 2) Preparation of oxidized-esterified starch: 20g of the oxidized starch prepared in step 1) is made into starch milk with a concentration of 30wt%, and moved into a three-necked flask, and 0.5wt% of catalyst nanocrystalline ce...

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Abstract

The invention relates to a preparation method of oxidation-esterification composite modified starch. There are many starch modification methods, and the composite modification can combine the advantages of the two modified starches. Adding nanocellulose in the starch modification process can promote starch modification. It improves the performance and application range of starch, and performs oxidation-esterification modification of starch. It has the advantages of both oxidized starch and esterified starch, and is more widely used in various fields of production and life.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite starch, and in particular relates to a method for oxidation-esterification composite modified starch. The modified starch not only has the advantages of good film-forming properties and low viscosity of oxidized starch, but also retains esterification. Starch has the characteristics of easy film-forming, strong paste gelation, and high transparency. The composite modified starch has good film-forming properties, high strength and transparency, and can be widely used in food packaging, fine chemicals, papermaking and other industries. Background technique [0002] Starch is a widely distributed, green and renewable natural high molecular polymer in nature, which is used in food, papermaking, textile, materials and other industries. Compared with native starch, oxidized starch has the advantages of low viscosity, high whiteness, high transparency, easy gelatinization, and good film-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/18C08B31/04
CPCC08B31/04C08B31/185
Inventor 杨桂花林兆云陈嘉川戢德贤
Owner QILU UNIV OF TECH
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