A kind of preparation method of thermoplastic fully degradable corn starch matrix

A corn starch, fully degradable technology, applied in the field of preparation of mechanical force and citric acid double-modified thermoplastic fully degradable corn starch matrix, can solve the problems of no strong interaction, incomplete degradation, high price, etc., to achieve long-term benefits Preservation, long-term preservation, and enhanced interaction effect

Inactive Publication Date: 2011-12-07
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above eight preparation methods have the following problems respectively: in method 1 and method 2, there is no special partial esterification, there is no strong interaction between starch and plasticizer, and the shelf life of the prepared corn starch matrix is ​​relatively short
Method 3 does not use ultrafine pulverization technology, the contact between plasticizer and starch is not sufficient, and the highest degree of esterification of the prepared corn starch matrix is ​​only 0.23
Method 4, method 5, and method 6 use polyvinyl alcohol (PVA), which is not completely degradable and is not conducive to environmental protection
In method 7, octenyl succinic anhydride is used, and the price of this material is relatively expensive, and the cost of the prepared corn starch matrix is ​​relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation method of thermoplastic fully degraded cornstarch matrix comprises the following steps:

[0016] Superfinely pulverize the common cornstarch so that the diameter of the cornstarch granules is 58-64 microns;

[0017] Add 500 kg of ultra-finely pulverized cornstarch and 125 kg of distilled water into a closed reactor and mix them so that the water content of the cornstarch reaches 20%; , stir at high speed for 3 minutes to mix thoroughly, and place in a closed reactor for 24 hours; heat and stir at a temperature of 120°C for 60 minutes for esterification reaction to obtain a viscous esterified product, after the reaction is completed, cool to room temperature to obtain a viscous esterified product; The esterified product is filtered and rinsed twice with distilled water to remove unreacted citric acid, and the product washed with distilled water is dried at 50°C to obtain a dry product, which is pulverized to obtain a light yellow powdery thermoplastic ful...

Embodiment 2

[0019] Add 1,000 kg of ultra-finely pulverized cornstarch and 250 kg of distilled water into a closed reactor and mix them so that the water content of the cornstarch reaches 20%; , and stir on high speed for 5 minutes to mix thoroughly.

[0020] Other steps are the same as in Example 1.

Embodiment 3

[0022] Add 600 kg of ultra-finely pulverized cornstarch and 150 kg of distilled water into a closed reactor and mix them so that the water content of the cornstarch reaches 20%; , beat on high speed for 4 minutes to mix well.

[0023] Other steps are the same as in Example 1.

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Abstract

The invention relates to a preparation method of a thermoplastic fully-degradable corn starch matrix, which comprises the following steps: carrying out micro-pulverization on corn starch, and adding water until the water content of the corn starch reaches 20%; mixing the corn starch (of which the water content is 20%), citric acid and glycerol in a mass ratio of 1:0.4:0.3, and evenly stirring at high speed; carrying out esterification reaction on the mixture to obtain a viscous esterified substance; and flushing the esterified substance with water twice, drying and pulverizing to obtain the light yellow powdery thermoplastic fully-degradable corn starch matrix. The particle size of the corn starch is made small by micro-pulverization, and the corn starch sufficiently contacts with the modifiers; since the actions of heat and shearing force on the particles are relatively obvious and sufficient, the temperature during reaction can be easily reached and controlled, thereby shortening the reaction time; the special phenomenon of partial esterification appears in the reaction process, so the anabiosis can be prevented, thereby facilitating long-term storage of the corn starch matrix. The modifiers used in the invention are innoxious and fully-degradable, thereby widening the application range of the corn starch matrix.

Description

technical field [0001] The invention relates to a preparation method of a thermoplastic fully degradable cornstarch matrix double-modified by mechanical force and citric acid. Background technique [0002] Thermoplastic starch (TPS) is a starch that breaks the hydrogen bonds and crystalline structure between starch molecules under the action of modifiers, heat and shear force, so that it can achieve the melting of microcrystals before decomposition, so that it can be thermoplastically processed into materials. . [0003] At present, the preparation of thermoplastic corn starch mainly has the following methods: 1. Disperse corn starch in water or organic solvent to make a suspension with a concentration of 35%-45%, add sodium hydroxide and monochloroacetic acid to starch milk , react with chemical reagents below the gelatinization temperature, and then filter, wash, and dry to obtain the product; 2. Prepare thermoplastic starch (TPS) with formamide as a plasticizer; 3. Use c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/04C08K5/053
Inventor 袁怀波马莉莎高翠平
Owner HEFEI UNIV OF TECH
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