Polyvinyl alcohol-based carbon aerogel using waste leather as carbon source, and preparation method thereof

A polyvinyl alcohol and carbon aerogel technology, which is used in the preparation/purification of carbon, can solve the problems of environmental pollution, difficult recycling, and complex components, and achieves a unique layered structure, excellent electromagnetic shielding effect, and excellent electrical conductivity. rate effect

Active Publication Date: 2020-11-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes its composition complex and difficult to recycle, and it is usually filled up or incinerated. In this case, trivalent chromium is easily oxidized into highly toxic hexavalent chromium, which brings extremely serious environmental pollution problems.

Method used

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  • Polyvinyl alcohol-based carbon aerogel using waste leather as carbon source, and preparation method thereof
  • Polyvinyl alcohol-based carbon aerogel using waste leather as carbon source, and preparation method thereof
  • Polyvinyl alcohol-based carbon aerogel using waste leather as carbon source, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0047] In this embodiment, a method for preparing PVA-based carbon airgel using waste leather as a carbon source, in parts by weight, comprises the following steps:

[0048] (1) Select waste chrome-tanned leather material products or scraps, and after pretreatment including washing, process and pulverize them to waste leather powder with an average particle size not higher than 4mm;

[0049] (2) Add the waste leather powder obtained in step (1) into a millstone-type solid-phase force chemical reactor for grinding and pulverization. After the milling is completed, the waste leather ultra-fine powder is collected; The process parameters of the chemical reactor are as follows: the grinding pressure is 4MPa, the temperature of the disc surface is controlled by feeding a constant temperature circulating liquid medium with a temperature of -10°C, 50 cycles of grinding, and the rotational speed of the disc is 50 rpm;

[0050] (3) 1.5 parts of discarded leather ultrafine powders are a...

Embodiment 2

[0055] In this embodiment, a method for preparing PVA-based carbon airgel using waste leather as a carbon source, in parts by weight, comprises the following steps:

[0056] (1) Select waste chrome-tanned leather material products or scraps, and after pretreatment including washing, process them into waste leather fragments with a diameter of no more than 1 to 5 cm;

[0057] (2) Put the discarded leather fragments obtained in step (1) into a millstone-type solid-phase force chemical reactor for grinding and pulverization. After the milling is completed, the waste leather ultrafine powder is collected; The process parameters of the chemical reactor are as follows: the grinding pressure is 6MPa, the temperature of the grinding disc surface is controlled by feeding a constant temperature circulating liquid medium at a temperature of -10°C, 60 cycles of grinding, and the grinding disc rotation speed is 50 rpm;

[0058](3) 1.5 parts of discarded leather ultrafine powders are added ...

Embodiment 3

[0063] In this embodiment, a method for preparing PVA-based carbon airgel using waste leather as a carbon source, in parts by weight, comprises the following steps:

[0064] (1) Select waste chrome-tanned leather material products or scraps, and after pretreatment including washing, process and pulverize them to waste leather powder with an average particle size not higher than 4mm;

[0065] (2) Add the waste leather powder obtained in step (1) into a millstone-type solid-phase force chemical reactor for grinding and pulverization. After the milling is completed, the waste leather ultra-fine powder is collected; The process parameters of the chemical reactor are as follows: the grinding pressure is 2MPa, the temperature of the grinding disc surface is controlled by feeding a constant temperature circulating liquid medium with a temperature of 10°C, 40 cycles of grinding, and the grinding disc rotation speed is 40 rpm;

[0066] (3) Add 3 parts of waste leather ultrafine powder ...

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Abstract

The invention relates to a polyvinyl alcohol-based carbon aerogel using waste leather as a carbon source, and a preparation method thereof. The preparation method comprises the following steps of: performing circular grinding for 30-60 times on the waste leather through a force chemical reactor, adding processed waste leather ultrafine powder into polyvinyl alcohol aqueous solution to sufficientlystir and mix uniformly, processing through quick cooling by liquid nitrogen and freeze drying by a freeze dryer to obtain a PVA/leather compound aerogel, and finally, performing high-temperature oxygen-free carbonization to obtain the polyvinyl alcohol-based carbon aerogel using the waste leather as the carbon source. According to the invention, the waste leather ultrafine powder can be sufficiently complexed with hydroxyl in PVA in the preparation method, and suitable for being used as the carbon source; furthermore, a multi-layer carbon structure formed by high-temperature oxygen-free carbonization can achieve the effect of enhancing the electromagnetic shielding performance of the obtained carbon aerogel; simultaneously, the preparation method provided by the invention is simple in step and low in cost; and thus, high-value industrial utilization on waste leather materials can be easily realized.

Description

technical field [0001] The invention belongs to the technical field of carbon aerogel preparation, and specifically relates to a carbon aerogel based on polyvinyl alcohol using waste leather as a carbon source and a preparation method thereof; The reactor has processed waste leather. Background technique [0002] Carbon airgel is a new type of porous solid material with a three-dimensional network structure based on carbon. It combines the excellent electrical and thermal conductivity of carbon materials with the characteristics of high specific surface area, high porosity, and low density of airgel. , has broad application prospects in the preparation of electromagnetic shielding materials, catalyst carriers, hydrogen storage, oil-absorbing materials and other fields, and has become a research hotspot in the field of new carbon materials in recent years. [0003] According to the prior art literature, carbon aerogels are mostly obtained from various organic composite aerog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 白时兵袁斌赖双鑫杨双桥李怡俊廖益
Owner SICHUAN UNIV
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