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Preparation method of heterogeneous lignin/polylactic acid composite material

A composite material and lignin technology, which is applied in the field of preparation of heterogeneous lignin/polylactic acid composite materials, can solve problems such as the inability to strengthen and toughen polylactic acid materials

Active Publication Date: 2021-04-30
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above deficiencies, to provide a preparation method of heterogeneous lignin / polylactic acid composite material, to solve the difficulty that existing lignin fillers cannot strengthen and toughen polylactic acid materials, and to prepare high-strength and high-toughness polylactic acid materials. Heterogeneous lignin / polylactic acid multifunctional polymer composite with excellent UV resistance

Method used

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  • Preparation method of heterogeneous lignin/polylactic acid composite material
  • Preparation method of heterogeneous lignin/polylactic acid composite material
  • Preparation method of heterogeneous lignin/polylactic acid composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A preparation method for a heterogeneous lignin / polylactic acid film, comprising the following steps:

[0041] (1) Preparation of heterogeneous lignin

[0042] First, add 3g of Lignin powder and 10mL of deionized water into a beaker, after stirring, add 0.3g of Span 20, 0.3g of Tween 20, and use an ultrasonic instrument to perform ultrasonic treatment for 10 minutes to ensure that the solution is fully dissolved; then, the completely dissolved The solution was poured into a zirconia ball milling jar equipped with 16 large zirconia ball milling beads with a diameter of 10 mm and 100 small zirconia ball milling beads with a diameter of 6 mm. The speed of the planetary ball mill was set at 480 rpm, and the solution mixture was ball-milled for 24 h, and the milling was interrupted for 30 min every 2 h to prevent overheating. After the ball milling was completed, samples of heterogeneous lignin powder were collected, and the collected samples were freeze-dried for 48 hours ...

Embodiment 2

[0046] A preparation method for a heterogeneous lignin / polylactic acid film, comprising the following steps:

[0047] (1) Preparation of heterogeneous lignin

[0048]First, add 3g of Lignin powder and 10mL of deionized water into a beaker, after stirring, add 0.3g of Span 80, 0.3g of Tween 40, and use an ultrasonic instrument to perform ultrasonic treatment for 10min to ensure that the solution is fully dissolved; then, the completely dissolved The solution was poured into a zirconia ball milling jar equipped with 16 large zirconia ball milling beads with a diameter of 10 mm and 100 small zirconia ball milling beads with a diameter of 6 mm. The speed of the planetary ball mill was set at 480 rpm, and the solution mixture was ball-milled for 24 h, and the milling was interrupted for 30 min every 2 h to prevent overheating. After the ball milling was completed, samples were collected, and the collected samples were freeze-dried for 48 hours before use.

[0049] (2) Preparation...

Embodiment 3

[0052] A preparation method for a heterogeneous lignin / polylactic acid film, comprising the following steps:

[0053] (1) Preparation of heterogeneous lignin

[0054] First, 3g of Lignin powder and 10mL of deionized water were added to the beaker, after stirring, 0.3g of surfactant Tween 80 (TW), 0.3g of carbon nanotube dispersion (TN) were added, and ultrasonic treatment was performed for 10min using an ultrasonic instrument. Make sure that the solution is fully dissolved; then, pour the completely dissolved solution into a zirconia ball milling jar equipped with 16 large zirconia balls with a diameter of 10mm and 100 small zirconia balls with a diameter of 6mm. The speed of the planetary ball mill was set at 480 rpm, and the solution mixture was ball-milled for 24 h, and the milling was interrupted for 30 min every 2 h to prevent overheating. After the ball milling was completed, samples were collected, and the collected samples were freeze-dried for 48 hours before use. T...

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Abstract

The invention discloses a preparation method of a heterogeneous lignin / polylactic acid composite material. The preparation method comprises the following steps: dispersing lignin in water to obtain a lignin solution; adding a dispersing agent and an interfacial compatibilizer into the lignin solution, carrying out ultrasonic mixing, and then carrying out mechanical ball milling on the obtained mixed solution; carrying out freeze drying on the ball-milled mixed solution to obtain heterogeneous lignin; dissolving polylactic acid in a good solvent at room temperature to obtain a polylactic acid solution; adding the heterogeneous lignin into the polylactic acid solution, conducting stirring until a uniform mixed solution is formed, and carrying out ultrasonic defoaming; and pouring the uniform mixed solution into a planar container until the solvent is completely volatilized to obtain a heterogeneous lignin / polylactic acid film. According to the invention, the problems of poor compatibility and dispersibility of lignin in traditional high polymer materials are solved, the contradiction of difficult coexistence of high strength and high toughness of a lignin filler in the material is realized, and the material is endowed with an excellent anti-ultraviolet function, so the application field of the material is greatly widened.

Description

technical field [0001] The invention belongs to the technical field, and more specifically relates to a preparation method of a heterogeneous lignin / polylactic acid composite material. Background technique [0002] Polylactic acid (PLA) is a polymer material made from renewable resources such as corn starch, which decomposes into carbon dioxide and water after use. It is non-toxic, non-irritating, highly plastic, and easy to process, and is considered to be a green bio-based polymer material with broad development prospects. PLA is derived from renewable resources, and it is also degradable and renewable. Studies have shown that PLA does not produce toxic substances during use, and its degradation products are not toxic to the body. PLA is a fully degradable biomass material, so it has good prospects in high-end medical products such as medical sutures, drug delivery, and tissue engineering scaffolds. At present, PLA is mainly used in films and packaging, textiles and fib...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L97/00C08L71/02C08K3/04C08K5/103C08J5/18C08H7/00
CPCC08J5/18C08H6/00C08J2367/02C08J2497/00C08J2471/02C08K3/041C08K5/103
Inventor 付宇黄扬泽
Owner NANJING FORESTRY UNIV
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