Modification method of high performance carbon paper based on supercritical fluid technology

A supercritical fluid and supercritical oxidation technology, which is applied in papermaking, paper, special paper, etc., can solve the problems of reducing oxidation time, difficulty in controlling the depth of gas-phase oxidation, and ineffective modification effect of a single titanate coupling agent. Achieve the effect of reducing oxidation time, intense molecular movement, and strong penetration ability

Active Publication Date: 2022-04-15
SHANDONG RENFENG SPECIAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to solve at least one of the above-mentioned technical problems, the present invention provides a method for modifying high-performance carbon paper using supercritical fluid technology. In supercritical fluid, O2 and titanate coupling agents are used to synergistically modify carbon fibers. It utilizes the characteristics of supercritical fluid’s strong penetration ability and intense molecular movement. On the one hand, it can reduce the oxidation time, reduce the difficulty of controlling the depth of gas-phase oxidation without destroying the strength of the carbon fiber body, and improve the surface roughness and content of the carbon fiber. Oxygen groups can more effectively wet the surface of carbon fibers to achieve uniform surface modification; on the other hand, the oxidized carbon fibers are modified by coupling agents, because titanate coupling agents have two different properties One end of the molecule of the group can form a chemical bond with the oxygen-containing active group on the surface of the carbon fiber, and the other end can react with the phenolic resin group to endow the resin with a certain degree of toughness. Less, the single titanate coupling agent modification effect is not obvious, improve the interfacial bonding force between carbon fiber and resin, thereby improving the mechanical properties and electrical conductivity of carbon paper

Method used

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  • Modification method of high performance carbon paper based on supercritical fluid technology
  • Modification method of high performance carbon paper based on supercritical fluid technology
  • Modification method of high performance carbon paper based on supercritical fluid technology

Examples

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Effect test

Embodiment 1

[0042] Put the carbon fiber in acetone, the amount of acetone used is 60ml / 1g of carbon fiber, extract it in a Soxhlet extractor at 80°C for 10h, wash it with distilled water until it is neutral, and dry it in an oven at 90°C for 3h; the cleaned carbon fiber Place in supercritical water reactor, add oxygen, reaction time 20min, reaction temperature 400°C, reaction pressure 25MPa, then dry in 90°C oven for 3h; put oxidized carbon fiber into 3% titanic acid Ester coupling agent TMC-311 in methanol solution, and placed in a supercritical water reactor, the temperature is controlled at 400 ° C, the pressure is 25 MPa, and the reaction time is 30 minutes; after the reaction, the carbon fiber is washed in supercritical water for 3 times. Then the carbon fiber was dried in an oven at 90° C. for 3 hours to obtain the modified carbon fiber.

[0043] Add 90 parts by mass of modified carbon fiber and 10 parts by mass of Tencel fiber into a mixing tank, add water to mix, and stir to make ...

Embodiment 2

[0046] Put the carbon fiber in acetone, the amount of acetone used is 40ml / 1g of carbon fiber, extract it in a Soxhlet extractor at 75°C for 15h, wash it with distilled water until it is neutral, and dry it in an oven at 80°C for 4h; the cleaned carbon fiber Put it in a supercritical water reactor, add oxygen, react for 15 minutes, react at a temperature of 380°C, and react at a pressure of 30MPa, and then dry it in an oven at 80°C for 4 hours; put the oxidized carbon fiber into a mass fraction of 2% titanic acid Ester coupling agent TMC-114 in methanol solution, and placed in a supercritical water reactor, the temperature is controlled at 380 ° C, the pressure is 30 MPa, and the reaction time is 25 minutes; after the reaction, the carbon fiber is washed in supercritical water for 4 times. Then the carbon fibers were dried in an oven at 80° C. for 4 hours to obtain modified carbon fibers.

[0047] Add 85 parts by mass of modified carbon fiber and 15 parts by mass of Tencel fib...

Embodiment 3

[0050] Put the carbon fiber in acetone, the amount of acetone used is 80ml / 1g of carbon fiber, extract it in a Soxhlet extractor at 85°C for 20h, wash it with distilled water until it is neutral, and dry it in an oven at 100°C for 2h; the cleaned carbon fiber Place in a supercritical water reactor, add oxygen, react for 10 minutes, react at a temperature of 450°C, and react at a pressure of 35MPa, then dry in an oven at 100°C for 2 hours; put the oxidized carbon fiber into a mass fraction of 1% titanic acid Ester coupling agent TMC-201 in methanol solution, and placed in a supercritical water reactor, the temperature is controlled at 450 ° C, the pressure is 35 MPa, and the reaction time is 20 minutes; after the reaction, the carbon fiber is washed in supercritical water for 5 times. Then the carbon fibers were dried in an oven at 100° C. for 2 hours to obtain modified carbon fibers.

[0051] Add 95 parts by mass of modified carbon fiber and 5 parts by mass of Tencel fiber int...

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Abstract

This application provides a method for modifying high-performance carbon paper with supercritical fluid technology. Under the action of supercritical fluid, O2 and titanate coupling agent are used to modify carbon fiber synergistically. On the one hand, it can reduce the oxidation time and improve the carbon fiber surface. roughness and oxygen-containing groups, more effectively wet the surface of carbon fibers, and achieve uniform surface modification; The number and types of oxygen-containing functional groups on the surface of carbon fibers are small, and the modification effect of a single titanate coupling agent is not obvious, thereby improving the mechanical properties and electrical conductivity of carbon paper.

Description

technical field [0001] The invention relates to a method for modifying high-performance carbon paper based on supercritical fluid technology, which belongs to the field of fuel cells. Background technique [0002] A fuel cell is a device that directly converts chemical energy into electrical energy. The gas diffusion layer is composed of a conductive porous material, which plays multiple roles such as supporting the catalytic layer, conducting electrons, mass transfer, heat transfer, and discharging water. It affects the performance of the electrode. one of the key components. Carbon paper is the most common gas diffusion layer substrate material, which has a uniform porous thin layer structure, good thermal and electrical conductivity, stable size, and good mechanical strength. [0003] Carbon paper is usually prepared by wet papermaking process, using carbon fiber as raw material through wet papermaking, resin impregnation, hot pressing curing, carbonization and graphitiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/00D21H13/50D21H17/53D21H17/36D21H17/48D21H17/06D06M11/34D06M13/503D06M101/40
CPCD21H27/00D21H13/50D21H17/53D21H17/36D21H17/48D21H17/06D06M11/34D06M13/503D06M2101/40
Inventor 刘娜宋佃凤郁国强汤秀秀何冬梅吴立群
Owner SHANDONG RENFENG SPECIAL MATERIALS
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