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Starch-based biodegradable plastic and preparation method thereof

A technology for degrading plastics and starch bases, 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 environment-friendly, Low cost and the effect of improving mechanical properties

Active Publication Date: 2022-04-22
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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  • Starch-based biodegradable plastic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0039] A demethylated sulfonated lignin, the preparation method of which comprises: 100 mL of sodium lignosulfonate (Yates, SON-002) with a concentration of 0.1 g / mL and 20 mL of sodium lignosulfonate with a concentration of 0.7 g / mL Hydrobromic acid was added into a three-necked flask equipped with a stirring and reflux condensing device, and stirred and reacted 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 kind of lignin modified nano mica, its preparation method comprises the steps:

[0043] (1) Put 100 g of muscovite (325 mesh) in a tube furnace and roast at 800 °C for 1 h to obtain roasted mica;

[0044] (2) Put 30 g of the roasted mica obtained in step (1) in 1 L of nitric acid with a concentration of 5 mol / L, and stir at 95°C for 5 h. After the reaction, cool to room temperature, filter, and deionize Washing with water several times until the filtrate is neutral to obtain mica treated with nitric acid;

[0045] (3) Add 10 g of mica obtained in step (2) into 0.1 g / mL demethylated sulfonated lignin solution (Preparation Example 1), and place it in a 325 W ultrasonic cleaner for 5 h After the treatment, centrifuge at 500 rpm to remove unstripped or larger-sized mica, and centrifuge the supernatant at 8000 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 the demethylated lignin in step (3) is replaced with undemethylated sulfonated lignin (Yates, SON-002). Sulfonated lignin, other conditions and steps are the same as in Preparation Example 2.

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Abstract

The invention provides starch-based biodegradable plastic and a preparation method thereof. The starch-based biodegradable plastic comprises a combination of starch, glycerol, polylactic acid and lignin modified nano mica, the nano mica has the characteristic of nano size effect, and is limited to be lignin modified nano mica, so that the compatibility between the nano mica and other components is improved, the components are bridged by the nano mica, and a brick-mud structure is constructed; further, the mechanical property, the water resistance and the heat resistance of the finally obtained starch-based biodegradable plastic are remarkably improved; meanwhile, the starch-based biodegradable plastic also has the advantages of low cost, high efficiency, green process, environmental friendliness and the like, and 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 utilization of biodegradable plastics to replace traditional non-degradable plastics will become the mainstream trend in recent years. The relatively 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 the product, which will ultimately be manifested 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 that widely exists in natural plants. It has the advantages of large yi...

Claims

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Application Information

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Patent Type & Authority Applications(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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