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Modified thermoplastic starch and preparation method thereof

A thermoplastic starch modification technology, which is applied in the field of modified thermoplastic starch and its preparation, can solve the problems of low strength and easy retrogradation of thermoplastic starch, and achieve the effects of high mixing uniformity, simple steps, and good anti-retrogradation performance

Active Publication Date: 2021-07-16
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a modified thermoplastic starch and a preparation method thereof for the defects of low strength and easy retrogradation of the existing thermoplastic starch. The modified thermoplastic starch not only has good anti-retrograde performance, but also has relatively Excellent mechanical strength, so that the biodegradable polyester composite material filled with modified thermoplastic starch has excellent stability

Method used

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  • Modified thermoplastic starch and preparation method thereof
  • Modified thermoplastic starch and preparation method thereof
  • Modified thermoplastic starch and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The preparation method of the modified thermoplastic starch of embodiment 1 may further comprise the steps:

[0046] 1) Add cornstarch and hydroxypropyl methylcellulose to a planetary ball mill in a mass-number ratio of 100:2 for dry ball milling. The grinding medium uses zirconia balls at a temperature of 60°C. The revolution speed of the ball mill is 60 rpm, and the rotation speed 120rpm, ball milling time 30min, to obtain refined starch;

[0047] 2) Add the plasticizer to the planetary ball mill equipped with refined starch in step 1) for dry ball milling, wherein the mass / number ratio of the plasticizer to the starch added in step 1) is 10:100, and the grinding medium adopts Zirconia balls, temperature 90°C, ball milling revolution speed 100rpm, rotation speed 200rpm, ball milling time 35min, to obtain plasticized starch;

[0048] 3) adding the basic catalyst, esterifying agent and coupling agent to the planetary ball mill equipped with plasticized starch in step 2...

Embodiment 6

[0058] The preparation method of the modified thermoplastic starch of embodiment 6, comprises the following steps:

[0059] 1) Put cornstarch and cellulose acetate into a planetary ball mill at a ratio of 100:5 by mass to carry out dry ball milling. The grinding medium is ceramic balls, the temperature is 70°C, the revolution speed of the ball mill is 60 rpm, the rotation speed is 110 rpm, and the milling time is 40 min , to obtain refined starch;

[0060] 2) Add the plasticizer to the planetary ball mill equipped with refined starch in step 1) for dry ball milling, wherein the mass / number ratio of the plasticizer to the starch added in step 1) is 5:100, and the grinding medium adopts Ceramic balls, temperature 95°C, ball mill revolution speed 120rpm, rotation speed 220rpm, ball mill time 40min, to obtain plasticized starch;

[0061] 3) adding the basic catalyst, esterifying agent and coupling agent to the planetary ball mill equipped with plasticized starch in step 2) and ca...

Embodiment 11

[0070] The preparation method of the modified thermoplastic starch of embodiment 11, comprises the following steps:

[0071] 1) Put cornstarch and cellulose acetate into a planetary ball mill at a ratio of 100:6 by mass and number for dry ball milling. The grinding medium is zirconia balls at a temperature of 80°C. 30min, obtain refined starch;

[0072] 2) Add the plasticizer to the planetary ball mill equipped with refined starch in step 1) for dry ball milling, wherein the mass / number ratio of the plasticizer to the starch added in step 1) is 15:100, and the grinding medium adopts Zirconia balls, temperature 95°C, ball milling revolution speed 120rpm, rotation speed 210rpm, ball milling time 35min, to obtain plasticized starch;

[0073]3) adding the basic catalyst, esterifying agent and coupling agent to the planetary ball mill equipped with plasticized starch in step 2) and carrying out dry ball milling, wherein the basic catalyst, esterifying agent, coupling agent and ste...

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Abstract

The modified thermoplastic starch disclosed by the invention comprises the following components in parts by mass: 100 parts of starch, 2-10 parts of modified cellulose, 5-25 parts of a plasticizer, 0.5-5 parts of a basic catalyst, 5-10 parts of an esterifying agent and 1-5 parts of a coupling agent. The modified thermoplastic starch not only has good anti-retrogradation performance, but also has better mechanical strength, so that the biodegradable polyester composite material filled with the modified thermoplastic starch has excellent stability. The preparation method of the modified thermoplastic starch is simple in step, low in equipment requirement, high in operability and small in dosage of modified raw materials, the processing efficiency can be improved, and damage, plasticization and esterification of starch crystal particles and coupling reinforcement of cellulose particles are efficiently achieved; moreover, the reinforced modified thermoplastic starch has excellent mechanical properties and good water resistance and retrogradation resistance, so that the application of the thermoplastic starch as a film material or a filling material in biodegradable materials is expanded.

Description

technical field [0001] The invention relates to the field of modification of biomass materials, in particular to a modified thermoplastic starch and a preparation method thereof. Background technique [0002] Starch is a common natural biopolymer material, which often contains amylose (linked by α-1,4 glycosidic bonds) and amylopectin (linked by α-1,4 and α-1,6 glycosidic bonds). It has the advantages of degradability, low cost, renewable and wide sources, and is a better filling material. With the implementation of the "Plastic Ban and Restriction Order", starch is widely used to fill biodegradable polyesters such as PLA, PBAT, PBS, and PGA, and is prepared into disposable plastic products such as plastic bags, lunch boxes, knives and forks, and straws. The addition of starch greatly reduces the cost of biodegradable polyester products. [0003] Starch crystallizes under the action of hydrogen bonds of polyhydroxy groups, and the direct use of starch is limited and the ef...

Claims

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Application Information

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IPC IPC(8): C08L3/06C08L1/28C08L1/12C08L1/04
CPCC08L3/06C08L2201/06C08L1/284C08L1/12C08L1/286C08L1/04
Inventor 田佳榕钱少平刘岳侬张家溪阮贇杰
Owner NINGBO UNIV
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