Modified lignin carbon dot and preparation method and application thereof

A technology of lignin carbon and lignin, which is applied in the field of modified lignin carbon dots and its preparation, can solve the problems of large amount of scratch-resistant additives, complicated processes, and increased VOC content of materials.

Active Publication Date: 2021-06-22
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the production, transportation and use of each material, it is inevitable to be rubbed by hard objects, but the surface hardness of plastic materials is low, and it is easy to leave obvious scratches on the surface of the product when subjected to external force
In the prior art, such as the invention patent with the publication number CN106147007A, the ceramic scratch-resistant additive SiAlON is added to improve the scratch-resistant performance of plastic materials, but the added amount of the scratch-resistant additive is relatively large, and its compatibility with plastics Poor, need to add a variety of additives to improve its compatibility with plastics
At the same time, in order to improve the performance of plastics, it is generally necessary to add a variety of additives, such as adding antioxidants to improve the oxidation resistance of materials; adding lubricants to reduce the friction coefficient of materials, etc., the process is complicated and the VOC content of materials is increased.
[0003] As a thermoplastic natural polymer, lignin is second only to cellulose in nature in terms of yield, and has good flame retardancy and thermal stability. In the prior art, lignin is often compounded with plastics to improve the performance of composite materials. However, the amount of lignin required is large, and because lignin contains a variety of active functional groups, such as hydroxyl, carbonyl, carboxyl, methyl and side chain structures, it is a polar material and has poor compatibility with plastics, so it needs to be added A variety of additives are used to improve its compatibility. In the prior art, such as the invention patent with the publication number CN105754209A, compatibilizers, plasticizers and coupling agents are added to improve the compatibility of the lignin / plastic system

Method used

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  • Modified lignin carbon dot and preparation method and application thereof
  • Modified lignin carbon dot and preparation method and application thereof
  • Modified lignin carbon dot and preparation method and application thereof

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preparation example Construction

[0047] The present invention provides a method of preparing a modified lignin carbon dot, comprising:

[0048] The ligno-based carbon source is mixed with water and silane coupling agents to obtain a modified lignin carbon dot.

[0049] If there is no particular explanation, the present invention has no special definition of the source of the components, and a commercially available product well known to those skilled in the art can be used.

[0050] In the present invention, the silane coupling agent preferably comprises N- (β-aminoethyl) -γ-aminopropyl methoxysilane, γ-aminopropyltriethoxysilane and N- ( One of the β-aminoethyl) -γ-aminopropyltrimethoxysilane is more preferably γ-aminopropyl triethoxysilane. In the present invention, the silane coupling agent is used as a passivating agent, which generates a polysiloxane small molecule to a lignin carbon dot during the reaction to improve the dispersibility of lignin carbon dots and lignin carbon dots. With the compatibility of ...

Embodiment 1

[0098] It is weighing 1 g of lignin to disperse in 10 ml of pure water, and 10 ml gamma-aminopropyltriethoxysilane (mass of lignin, volume ratio of gamma-aminopropylsoxysilane) is added to 400 rpm magnetic stirring. It was 1 g: 10 mL: 10 mL), stirred at 25 ° C for 2.5 h, and the mixed solution was transferred to 50 ml of the reaction kettle, and the reaction was 50 ° C for 5 h. After the reaction was completed, it was naturally cooled to room temperature, and the mass concentration was 20% hydrochloric acid. 8000 rpm centrifugation, 0.22 μm filter filtration, in turn at 40 ° C for 10 min, 60 ° C for 10 min, 80 ° C for 30 min, 200 ml of water, then transferred to 1000 DA dialysis bag 48h, freeze drying 48h, freeze drying After the powder was ground, after 500 mesh sieve, dried under -0.9 MPa, dried under vacuum for 8 h, resulting in modified lignin carbon dots.

Embodiment 2

[0100] Weigh 1 g of lignozoulfonate dispersed in 10 ml of pure water, 10 ml of gamma-aminopropyltriethoxysilane (sodium lignin sulfonate, volume and gamma-aminopropyl group) with 400 rpm magnetic force. The volume ratio of oxygen is 1 g: 10 mL: 10 mL), stirred at 25 ° C for 2.5 h, and the mixed solution was transferred to 50 ml of the reaction kettle, and the reaction was reacted at 180 ° C for 5 h, and the reaction was naturally cooled after the reaction, with a mass concentration of 20%. The neutralization of hydrochloric acid was centrifuged, 0.22 μm filtration filtration, and the evaporation of 30 min at 40 ° C, 60 ° C for 30 min, 80 ° C for 30 min, and transferred to 1000 da, diluted 48h, frozen dry 48h After the frozen dry powder was ground, it was 500 mesh sieve, dried under -0.9 MPa, and dried under vacuum to obtain a sodium lignozoate sodium dot.

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Abstract

The invention provides a modified lignin carbon dot and a preparation method and application thereof, and relates to the technical field of nano materials. According to the preparation method of the modified lignin carbon dot, a lignin-based carbon source, water and a silane coupling agent are subjected to a hydrothermal reaction, and the modified lignin carbon dot is obtained; or hydrothermal reaction is performed on the lignin-based carbon source and water to obtain the lignin carbon dot, and hydrothermal reaction is performed on the lignin carbon dot, water and a silane coupling agent to obtain the modified lignin carbon dot. The silane coupling agent is utilized to modify the lignin carbon dot so that the dispersity of the lignin carbon dot is improved, the lignin carbon dot has multifunctionality, the high temperature resistance, oxidation resistance and scratch resistance of the composite material can be improved, and the friction coefficient of the composite material is reduced. Results of the embodiment show that when the modified lignin carbon dot is added into polypropylene, the degradation temperature of the composite material is increased by 20 DEG C, the oxidation induction period is 4.65 min, the friction coefficient is reduced to 0.164, and the scratch resistance is good.

Description

Technical field [0001] The present invention relates to the field of nanomaterials, and more particularly to a modified lignin carbon dot and a preparation method thereof. Background technique [0002] The plastic material has the advantages of low cost, high strength, high strength, good chemical resistance, good processing process, and easy recycling, in the past ten years, the application of industrial and life has increased. Each material is in production, transportation and use, it is inevitable that the hard object will be rubbed, but the surface hardness of the plastic material is low, and it is easy to leave a significant scratch on the surface of the product when it is affected. The prior art adding ceramic scratch-resistant Sialon to the invention patent to CN 106147007A to increase the scratch resistance of the plastic material, but the amount of scratch-resistant additive is large, and its compatibility with plastic Poor, there is a need to add a plurality of additive...

Claims

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Application Information

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IPC IPC(8): C01B32/15C08L23/12C08K9/06C08K3/04
CPCC01B32/15C08K9/06C08K3/04C08L2201/08C08L23/12
Inventor 刘跃军罗林园冯建湘彭思梅陈艺峰吴任钊李振兴
Owner HUNAN UNIV OF TECH
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