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A kind of starch-based biodegradable plastic and preparation method thereof

A degradable plastic and starch-based technology, applied in the field of degradable plastics, can solve the problems of limited improvement in mechanical properties, heat resistance and water resistance, lack of strong interaction, poor interface compatibility, etc., to achieve process and environmental friendliness, Low cost, the effect of improving mechanical properties

Active Publication Date: 2022-06-28
中科南京绿色制造产业创新研究院 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem of poor interfacial compatibility between nano-mica and starch-based biodegradable plastics, and there is a lack of strong interaction between the two phases. Therefore, the mechanical properties, heat resistance and water resistance of nano-mica-reinforced composite materials are improved. limited

Method used

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  • A kind of starch-based biodegradable plastic and preparation method thereof

Examples

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Effect test

preparation example 1

[0039] A demethylated sulfonated lignin, the preparation method comprising: mixing 100 mL of sodium lignosulfonate (Yetz, SON-002) with a concentration of 0.1 g / mL and 20 mL of 0.7 g / mL of Hydrobromic acid was added to a three-necked flask equipped with a stirring and reflux condensing device, and the reaction was stirred at 100° C. for 6 h to obtain the demethylated sulfonated lignin.

[0040] The content of phenolic hydroxyl groups in the demethylated sulfonated lignin prepared in this preparation example is 6 mmol / g, and the content of sulfonic acid groups is 3 mmol / g.

preparation example 2

[0042] A lignin-modified nano-mica, the preparation method of which comprises the following steps:

[0043] (1) 100 g muscovite (325 mesh) was placed in a tube furnace for calcination at 800 °C for 1 h to obtain calcined mica;

[0044] (2) 30 g of the calcined mica obtained in step (1) was placed in 1 L of nitric acid with a concentration of 5 mol / L, and the reaction was stirred at 95 °C for 5 h. After the reaction was completed, it was cooled to room temperature, filtered, and deionized. Wash with water several times until the filtrate is neutral to obtain mica treated with nitric acid;

[0045] (3) 10 g mica obtained in step (2) was added to 0.1 g / mL demethylated sulfonated lignin solution (preparation example 1), and placed in a 325 W ultrasonic cleaner for ultrasonic treatment for 5 h. , after the treatment, centrifuged at 500 rpm to remove unpeeled or larger-sized mica, and the supernatant was centrifuged at 8,000 rpm to obtain the lignin-modified nano-mica.

preparation example 3

[0047] A lignin-modified nano-mica, which differs from Preparation Example 2 only in that non-demethylated sulfonated lignin (Yates, SON-002) is used to replace the demethylated lignin in step (3). For sulfonated lignin, other conditions and steps are the same as in Preparation Example 2.

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Abstract

The invention provides a starch-based biodegradable plastic and a preparation method thereof. The starch-based biodegradable plastic includes a combination of starch, glycerin, polylactic acid and lignin-modified nano-mica; the nano-mica has the characteristics of nano-size effect , and it is limited to lignin-modified nano-mica, which improves the compatibility between the nano-mica and other components, and at the same time uses it to bridge other components to build a "brick-mud" structure , thereby significantly improving the mechanical properties, water resistance and heat resistance of the final starch-based biodegradable plastic; at the same time, the starch-based biodegradable plastic also has the advantages of low cost, high efficiency, green process and environmental friendliness. It has important research significance.

Description

technical field [0001] The invention belongs to the technical field of degradable plastics, and in particular relates to a starch-based biodegradable plastic and a preparation method thereof. Background technique [0002] At present, the development and use of biodegradable plastics to replace traditional non-degradable plastics will become the mainstream trend in recent years. The more mature biodegradable plastics on the market are mainly PBAT (thermoplastic biodegradable plastics) and PLA (polylactic acid), but the two The high price (25,000-35,000 / ton) will inevitably lead to an increase in the price of products, which is ultimately reflected in the low acceptance of biodegradable plastic products by end consumers. Therefore, the development of low-cost biodegradable plastics will support the widespread use of degradable materials. [0003] Starch is a natural polymer material widely present in natural plants, with the advantages of large yield, low price, excellent bio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/02C08L67/04C08K5/053C08K9/04C08K3/34
CPCC08L3/02C08L2201/06C08L2201/08C08K2201/011C08L67/04C08K5/053C08K9/08C08K3/34
Inventor 胡超权杨伟胜马猛李杨杨许雪冰李琳
Owner 中科南京绿色制造产业创新研究院
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