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Thermoplastic starch based on coordination effect as well as preparation method and application of thermoplastic starch

A thermoplastic starch and effect technology, applied in the field of thermoplastic starch and its preparation, can solve problems such as few detailed research reports on coordination, and achieve the effects of high coordination reaction efficiency, reducing free volume and improving hydrophobicity

Inactive Publication Date: 2019-11-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The oxygen atom on the hydroxyl group of starch contains a lone pair of electrons, so starch has a certain coordination ability. However, there are few detailed research reports on the coordination between starch and metal ions in the reactive extrusion process.

Method used

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  • Thermoplastic starch based on coordination effect as well as preparation method and application of thermoplastic starch
  • Thermoplastic starch based on coordination effect as well as preparation method and application of thermoplastic starch
  • Thermoplastic starch based on coordination effect as well as preparation method and application of thermoplastic starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Dry the starch at 110°C for 4 hours, then pre-mix it with glycerin at a mass ratio of 7:3; then add anhydrous zinc acetate (ZA) accounting for 1% of the starch mass, and further mix to obtain a mixture, and then pass the mixture through a twin-screw extruder The thermoplastic starch based on the coordination effect (referred to as TPS-ZA1) is obtained by reactive extrusion and pelletizing. Put TPS-ZA1 in a Soxhlet extractor, use absolute ethanol as solvent, and purify at 95°C for 48 hours to obtain a purified thermoplastic starch based on coordination effect (referred to as CS / ZA1).

Embodiment 2

[0043] Dry the starch at 110°C for 4 hours, then pre-mix it with glycerin at a mass ratio of 7:3; then add anhydrous zinc acetate (ZA) accounting for 3% of the starch mass, and further mix to obtain a mixture, and then pass the mixture through a twin-screw extruder The thermoplastic starch based on the coordination effect (referred to as TPS-ZA3) is obtained by reactive extrusion and pelletizing. Put TPS-ZA3 in a Soxhlet extractor, use absolute ethanol as solvent, and purify at 95°C for 48 hours to obtain a purified thermoplastic starch based on coordination effect (referred to as CS / ZA3).

Embodiment 3

[0045] Dry the starch at 110°C for 4 hours, then pre-mix it with glycerin at a mass ratio of 7:3; then add anhydrous zinc acetate (ZA) accounting for 5% of the starch mass, and further mix to obtain a mixture, and then pass the mixture through a twin-screw extruder The thermoplastic starch based on the coordination effect (referred to as TPS-ZA5) is obtained by reactive extrusion and pelletizing. Put TPS-ZA5 in a Soxhlet extractor, use absolute ethanol as solvent, and purify at 95°C for 48 hours to obtain a purified thermoplastic starch based on coordination effect (referred to as CS / ZA5).

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Abstract

The invention discloses thermoplastic starch based on a coordination effect as well as a preparation method and application of the thermoplastic starch. The preparation method comprises the followingsteps: premixing starch and a plasticizer to obtain a premixed material, adding anhydrous zinc acetate, carrying out further mixing, and carrying out extrusion granulation to obtain the thermoplasticstarch based on the coordination effect. According to the method, through reactive extrusion, efficient coordination of starch hydroxyl and Zn<2+> is realized, and the modified thermoplastic starch with outstanding advantages of high heat resistance, high hydrophobicity, high strength and the like can be obtained only by adding a small amount of anhydrous zinc acetate, the glass transition temperature is improved to 89.1 DEG C, the surface contact angle is improved to 118.2 degrees, and the tensile strength is improved to 9.2 MPa; and the modified thermoplastic starch is biodegradable, green,environment-friendly, excellent in comprehensive performance and easy to process, and is expected to be applied to the fields of packaging, disposable tableware, agricultural mulching films and the like.

Description

technical field [0001] The invention belongs to the field of biodegradable plastics, and in particular relates to a thermoplastic starch based on coordination effect and its preparation method and application. Background technique [0002] In recent years, with the improvement of public awareness of environmental protection, the development of biodegradable polymers to replace traditional petroleum-based polymers has gradually become a research hotspot. Starch is a natural polymer with the advantages of complete biodegradability, wide sources and low cost, and has broad development prospects. Great achievements have been made at home and abroad in improving the mechanical properties of starch-based plastics. However, the fatal defect of high hydrophilicity of starch still seriously limits the application of thermoplastic starch plastics. Usually, chemical methods, such as chemical cross-linking, esterification, and grafting, are used to modify starch hydrophobically. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08K5/098
CPCC08K5/098C08L2201/06C08L3/02B29B7/7461B29B9/06B29B9/12B29B7/007B29B7/48B29B7/92
Inventor 张水洞贺衍王凯
Owner SOUTH CHINA UNIV OF TECH
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