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Lignin-containing bio-based composite material and preparation method thereof

A composite material and lignin technology, which is applied in the field of bio-based composite materials containing lignin and its preparation, can solve the impact of the strength and rigidity of lignin composite materials, the dispersion and compatibility between matrices are not outstanding, and the wood Reduce the environmental protection performance of plain composite materials and other problems, achieve good anti-ultraviolet radiation performance, improve thermal stability, and excellent mechanical properties

Active Publication Date: 2020-09-29
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the poor interface between polyamide resin and lignin, the dispersion and compatibility between the matrix are not outstanding, and the addition of a large amount of polyamide will also greatly affect the strength and rigidity of lignin composites.
In addition, the addition of a large amount of conventional polyamide resin will also affect the biodegradability of the blend composition, which greatly reduces the environmental performance of the lignin composite material.

Method used

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  • Lignin-containing bio-based composite material and preparation method thereof
  • Lignin-containing bio-based composite material and preparation method thereof
  • Lignin-containing bio-based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Preparation of bio-based polyamide polymers

[0075] (1) Add 100g of undecylenic acid methyl ester and 1g of 1,3-diamino-propanol into 4ml of tetrahydrofuran; after passing through argon for half an hour, place it in an oil bath at 40°C, add 10ml of sodium methoxide, React at 40°C for 20 hours, and then recrystallize to obtain a white powdery solid, which is the desired functional polyamide monomer 1;

[0076] (2) Put 54g of functional polyamide monomer 1, 12g of butyric anhydride, and 40mg of dimethylaminopyridine into a round-bottomed flask, add 3ml of tetrahydrofuran to mix, and react at 50°C for 10 hours to obtain a clear solution. The functional polyamide obtained after purification Amide monomer 2;

[0077] (3) Add 1350 mg of functional polyamide monomer 2, 150 mg of functional polyamide monomer 1, 200 mg of oxadithiol, and 10 mg of azobisisobutyronitrile catalyst and 10 ml of tetrahydrofuran into the reaction vessel; feed argon for 15 After that, the mixture wa...

Embodiment 2

[0080] Preparation method of bio-based composite material containing lignin

[0081] (1) 50 parts by weight of unmodified lignin (not modified by chemical groups of lignin) and 50 parts by weight of the polyamide obtained in Example 1 were dried in a vacuum oven at 60°C for 8h, and set aside ;

[0082] (2) Mix the dried lignin and polyamide in step (1), add them into an internal mixer, and blend them for 10 minutes at 100°C and a speed of 100r / min;

[0083] (3) Put the mixture kneaded in step (2) into a vacuum tablet press, and press it at 150° C. to obtain a bio-based composite material containing lignin.

[0084] Example 2

[0085] Preparation method of bio-based composite material containing lignin

[0086] (1) 60 parts by weight of unmodified lignin and 40 parts by weight of the polyamide obtained in Example 1 were dried in a vacuum oven at 60°C for 8 hours, and set aside;

[0087] (2) Mix the dried lignin and polyamide in step (1), add them into an internal mixer, and...

Embodiment 3

[0090] Preparation method of bio-based composite material containing lignin

[0091] (1) 70 parts by weight of unmodified lignin and 30 parts by weight of the polyamide obtained in Example 1 were dried in a vacuum oven at 60°C for 8 hours, and set aside;

[0092] (2) Mix the dried lignin and polyamide in step (1), add them into an internal mixer, and blend them for 10 minutes at 100°C and a speed of 100r / min;

[0093] (3) Put the mixture kneaded in step (2) in a vacuum tablet press, and press it at 150° C. to obtain a bio-based composite material containing lignin.

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Abstract

The invention discloses a bio-based composite material containing lignin, belonging to the technical field of high polymer materials. The bio-based composite material is mainly prepared from the following raw materials in parts by weight: 50-80 parts of lignin and 20-50 parts of polyamide. The general structural formula of the polyamide is shown in the specification; and in the formula, n is morethan or equal to 5 and less than or equal to 5000, R1 and R3 are aliphatic main chain structures, R2 is a side chain structure with an ester functional group, and R4 is a main chain structure with thioether. The invention also provides a preparation method of the composite material. The lignin-containing bio-based composite material has the beneficial effects that the prepared lignin-containing bio-based composite material still has good toughness when containing 80% of lignin, the utilization rate of lignin is greatly increased, the application field of lignin is greatly widened, and the material has excellent ultraviolet resistance, good industrial prospects and high commercial value.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a bio-based composite material containing lignin and a preparation method thereof. Background technique [0002] Lignin, the second most abundant natural polymer on earth, widely exists in the cell walls of plants and has been considered as a promising resource to replace existing fossil fuels. Lignin's low cost, abundant content, environmental friendliness, and good UV radiation resistance make lignin have many potential applications, such as adhesives, sunscreen creams, carbon fibers, fillers, bio-derived synthetic polymers, and composite materials. [0003] The value-added application of lignin materials has broad prospects, but there are performance defects of poor toughness. Lignin is an amorphous thermoplastic material with high glass transition temperature and free radical self-adaptation at high temperature, which limits its thermal stability. In addition, lign...

Claims

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Application Information

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IPC IPC(8): C08L97/00C08L77/06C08G69/42
CPCC08L97/005C08L77/06C08G69/42C08L2201/08C08L2201/12C08G2230/00
Inventor 章亚琼陈佳伟汪钟凯吴茫邢明欣孔维铭
Owner ANHUI AGRICULTURAL UNIVERSITY
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