Nitrogen-doped nano SiO2/CBN hybrid material and preparation method thereof

A technology of hybrid materials and nitrogen doping, applied in the direction of fibrous fillers, etc., can solve the problems of insufficient reactivity and many functional groups on the surface of lignin, and achieve the effects of improving reactivity, reducing carbon emissions, and increasing density

Active Publication Date: 2022-05-13
JILIN UNIV
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  • Abstract
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Problems solved by technology

[0009] (2) The surface functional groups of lignin are numerous and miscellaneous, which is not enough for each specific reactivity. Therefore, it is necessary to unify the surface active functional groups according to product requirements.
[0013] (6) Lignin is a natural degradable macromolecular material, which can be used to prepare SiO2 / lignin composite materials, and there are many studies on the performance of rubber and plastic products, but there is no literature on the degradability of lignin on rubber products. The performance impact of
[0014] There are no patents or literature reports on converting lignin into organic carbon black

Method used

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  • Nitrogen-doped nano SiO2/CBN hybrid material and preparation method thereof

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Experimental program
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Embodiment 1

[0048] A preparation method of nitrogen-doped nano-SiO2 / CBN hybrid material, comprising:

[0049] Step S1, separation of hemicellulose and soluble impurities

[0050] Mix the rice husk with a sulfuric acid solution with a mass concentration of 2wt% at a solid-to-liquid ratio of 1kg:8L, heat and reflux for 5h, filter, and wash the filter residue until neutral;

[0051] Step S2, alkali and additives synergistically catalyze the degradation of phenolated lignin and dissolved silica

[0052] The filter residue washed to neutral in step S1 and the mass concentration of 5wt% sodium hydroxide solution are added to the horizontal reactor according to the solid-to-liquid ratio of 1kg:8L, and then the auxiliary agent sodium thiosulfate is added to the system to adjust the concentration 4.5 wt%, stirring evenly, heating at 200°C, hydrothermally degrading lignin at a constant temperature for 3 hours, and filtering to obtain a composite filtrate containing degraded phenolized lignin and s...

Embodiment 2

[0060] The concentration of the additive sodium thiosulfate in step S2 in Example 1 was changed to 1 wt%, and the other conditions were the same as in Example 1 to obtain a SiO2 / CBN hybrid material with 14at.% of nitrogen and oxygen-containing functional groups on the surface.

Embodiment 3

[0062] Change step S5 "under air atmosphere" in embodiment 1 to be under nitrogen and air volume ratio be 50:50 atmosphere, other conditions are identical with embodiment 1, obtain the SiO2 / CBN that surface nitrogen-containing oxygen functional group is 8.5at.% hybrid materials.

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Abstract

The invention relates to a nitrogen-doped nano SiO2 / CBN hybrid material and a preparation method thereof, and belongs to the field of biomass energy and chemical industry, and the method comprises the following steps: separating hemicellulose and soluble impurities; the alkali and the auxiliary agent synergistically catalyze and degrade phenolated lignin and dissolve silicon dioxide; preparing a nano silicon dioxide / lignin hybrid material through self-assembly; dipping with ammonium chloride and doping nitrogen; aromatic ring organic characteristic structure lignin carbon is prepared through low-temperature carbon sequestration dehydration; the nitrogen-doped nano silicon dioxide / carbon black hybrid material (SiO2 / CBN) is prepared through low-temperature heat treatment, in order to prepare the hybrid material, a lignin degradation phenolation method is firstly adopted, after phenolation, silicon dioxide and lignin are mutually adsorbed, and nano silicon dioxide / lignin hybrid material particles are prepared after deposition and polymerization in lignin molecular chains; and lignin is degraded and converted into organic carbon black through nitrogen-doped dehydration carbon sequestration to prepare nano SiO2 / CBN, so that potential safety hazards are eliminated, and the service life of a product is prolonged.

Description

technical field [0001] The invention relates to the field of biomass energy chemical industry, in particular to a nitrogen-doped nano-SiO2 / CBN hybrid material and a preparation method thereof. Background technique [0002] Silica and carbon black co-filled rubber composites have the advantages of low hysteresis, wear resistance, and reinforcement, and are widely used in tire treads and other rubber products. [0003] Nano-carbon black and silica are the main reinforcing agents in the rubber industry, which improve the performance of rubber products, but each has its own strengths and weaknesses. In recent years, the mixed application of carbon black and white carbon black has become a research and development hotspot. The method of preparing dual-phase fillers mainly adopts the following mode: (1) Silica and carbon black are mixed with each other, added to the rubber system, kneaded and mixed to weaken the agglomeration effect of each other, and complement each other. (2) ...

Claims

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Application Information

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IPC IPC(8): C08K3/04C08K3/36C08K9/12C09C1/48
CPCC08K3/04C08K3/36C08K9/12C09C1/48Y02T10/86
Inventor 王晓峰何忠禹王子忱
Owner JILIN UNIV
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