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Thermoplastic starch for bioplastics and preparation method thereof

A thermoplastic starch and bioplastic technology, applied in the field of bioplastics, can solve problems such as film stickiness, limited improvement in film rigidity, and reduction in thermoplasticity.

Pending Publication Date: 2021-09-14
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It can be seen that the currently widely used small-molecule plasticizers have the disadvantages of easy water absorption and precipitation, resulting in film stickiness, limited increase in film rigidity, and easy retrogradation of starch, resulting in a decrease in thermoplasticity.

Method used

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  • Thermoplastic starch for bioplastics and preparation method thereof
  • Thermoplastic starch for bioplastics and preparation method thereof
  • Thermoplastic starch for bioplastics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) First mix deionized water, absolute ethanol, and ammonia water to prepare a pre-preparation solution, and heat it to 40°C, then add tetraethyl orthosilicate to the pre-preparation solution, and stir slowly for 45 minutes to obtain a cloudy solution; orthosilicon The addition of ethyl acetate is 15% of the pre-prepared liquid quality;

[0038] In the pre-mixed liquid, by weight, 1 weight part of deionized water, 0.5 weight part of absolute ethanol, and 0.1 weight part of ammonia water;

[0039] (2) Add the turbid liquid prepared in step (1), raw starch, dispersant, composite plasticizer, and water into a high-speed mixer, then heat to 90°C and stir evenly, so that the water is fully immersed in the starch granules and paste starch; the original starch is corn starch; the dispersant is glyceryl monostearate; the composite plasticizer is adipate polyester and glycerin compounded at a mass ratio of 1:3;

[0040] In the reaction system, by weight, 15 parts by weight of ...

Embodiment 2

[0047] (1) First mix deionized water, absolute ethanol, and ammonia water to prepare a pre-preparation solution, and heat it to 40°C, then add tetraethyl orthosilicate to the pre-preparation solution, and stir slowly for 60 minutes to obtain a cloudy solution; orthosilicon The addition of ethyl acetate is 15% of the pre-prepared liquid quality;

[0048] In the pre-mixed liquid, by weight, 1 weight part of deionized water, 0.5 weight part of absolute ethanol, and 0.1 weight part of ammonia water;

[0049] (2) Add the turbid liquid prepared in step (1), raw starch, dispersant, composite plasticizer, and water into a high-speed mixer, then heat to 90°C and stir evenly, so that the water is fully immersed in the starch granules and paste The original starch is pea starch; the dispersant is glyceryl monostearate; the composite plasticizer is adipate polyester and glycerin compounded at a mass ratio of 1:3;

[0050] In the reaction system, by weight, 20 parts by weight of turbid li...

Embodiment 3

[0057] (1) First mix deionized water, absolute ethanol, and ammonia water to prepare a pre-preparation solution, and heat it to 40°C, then add tetraethyl orthosilicate to the pre-preparation solution, and stir slowly for 50 minutes to obtain a cloudy solution; orthosilicon The addition of ethyl acetate is 17% of the pre-prepared liquid quality;

[0058] In the pre-mixed liquid, by weight, 1 weight part of deionized water, 0.5 weight part of absolute ethanol, and 0.1 weight part of ammonia water;

[0059] (2) Add the turbid liquid obtained in step (1), raw starch, dispersant, composite plasticizer, and water into a high-speed mixer, then heat to 80°C and stir evenly, so that the water is fully immersed in the starch granules and paste starch; the original starch is sweet potato starch; the dispersant is glyceryl monostearate; the composite plasticizer is adipate polyester and glycerol compounded at a mass ratio of 1:3;

[0060] In the reaction system, by weight, 15 parts by we...

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Abstract

The invention relates to the field of bioplastics, and discloses thermoplastic starch for bioplastics and a preparation method thereof. The thermoplastic starch comprises the following steps: (1) mixing deionized water, absolute ethyl alcohol and ammonia water to obtain a pre-prepared solution, and adding tetraethoxysilane for reaction to obtain a turbid solution; (2) mixing the turbid liquid with native starch, a dispersing agent, a composite plasticizer and water at a high speed, and heating so that starch particles are fully immersed in the water, and starch is gelatinized; (3) adding adipic acid for further high-speed mixing, heating for reaction, and exhausting to obtain a bulk material; (4) kneading the bulk material, maleic anhydride and a lubricant to fully esterify the starch to obtain composite esterified starch; and (5) mixing the composite esterified starch with PBAT, and carrying out extrusion granulation to prepare the thermoplastic starch. The prepared thermoplastic starch has good compatibility with PBAT, the thermoplasticity and water resistance of the starch can be improved, meanwhile, starch retrogradation or recrystallization caused by precipitation of a plasticizer can be prevented.

Description

technical field [0001] The invention relates to the field of bioplastics, and discloses a thermoplastic starch used for bioplastics and a preparation method. Background technique [0002] Bioplastics play an important role in the control of environmental pollution. In order to replace the non-degradable plastic packaging bags currently used in large quantities, in recent years, people have continued to choose bioplastics suitable for making film packaging bags. PBAT (polybutylene terephthalate adipate) is a bioplastic containing flexible aliphatic chains. It has good ductility and film-forming properties. It is currently the most suitable bioplastic for making packaging bags. . [0003] However, there are still many problems in the process of preparing packaging bags and popularizing and using PBAT blown film. On the one hand, PBAT is too soft, and the stability is poor when blowing the film. The cost of plastic is too high, more than three times the cost of ordinary plast...

Claims

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Application Information

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IPC IPC(8): C08L3/06C08L67/02C08L67/00C08K5/053C08K7/26
CPCC08L3/06C08L2205/03C08K2201/011C08L67/02C08L67/00C08K5/053C08K7/26
Inventor 曾军堂陈庆司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD
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