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Novel phenolic resin and application thereof in preparation of flexible graphite-based bipolar plate

A phenolic resin and flexible graphite technology, applied in the field of bipolar plate processing, can solve the problems of unsatisfactory resin impregnation effect, affecting the gas permeability and mechanical properties of materials, etc., and achieve better air tightness and acid and alkali resistance. The effect of good mechanical properties, air tightness and acid and alkali resistance

Pending Publication Date: 2022-07-29
宁波信远材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bipolar plate prepared by this method is easy to form, but the effect of resin impregnation is not ideal, which will affect the gas permeability and mechanical properties of the material

Method used

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  • Novel phenolic resin and application thereof in preparation of flexible graphite-based bipolar plate
  • Novel phenolic resin and application thereof in preparation of flexible graphite-based bipolar plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of flexible graphite-based bipolar plates:

[0045] Preparation of flexible graphite paper:

[0046] Take 295 parts by weight of sulfuric acid with a concentration of 98%, add 5 parts by weight of a 60% concentration of hydrogen peroxide solution, cool down to 10 ° C, add scaly natural graphite with a particle size distribution of 30 to 80 meshes, react for 40min, then suction filter, remove Washing with ionized water, repeating the operation 3 times, drying at 110°C to obtain expandable graphite; treating at 1000°C for 8s to expand into worm-like graphite, and separating from gas and gas to obtain graphite worms with a length in the range of 0.6-1.2cm;

[0047] After that, the graphite worms are evenly paved and rolled to make a density of 0.1g / cm 3 Graphite sponge cake board; then carry out multi-pass rolling pressing to obtain flexible graphite paper, wherein the pressure applied in the rolling step is 100Mpa, the temperature is 230 ° C, and the rolling sp...

Embodiment 2

[0051] Preparation of flexible graphite-based bipolar plates:

[0052] The preparation of flexible graphite paper is different from Example 1: the density of the prepared flexible graphite paper is 1.6g / cm 3 ;

[0053] The preparation of the bipolar plate is different from that in Example 1: the pressure holding time of the vacuum tank is 8h.

[0054] The resin content in the flexible graphite-based bipolar plate is 23.6 wt %.

Embodiment 3

[0056] Preparation of flexible graphite-based bipolar plates:

[0057] The preparation of flexible graphite paper is different from Example 1: the density of the prepared flexible graphite paper is 1.5g / cm 3 ;

[0058] Preparation of bipolar plates:

[0059] Take the flexible graphite paper and put it into the vacuum tank, keep the negative pressure of 0.1MPa, and feed the phenolic resin diluent with a concentration of 25wt%. The phenolic resin diluent is ordinary tap water; the vacuum tank is kept under pressure for 6 hours and 6kg of compressed air is introduced; The flexible graphite paper filled with phenolic resin in the pores was taken out, and the residual resin on the surface was wiped; the solvent water in the graphite paper was dried under pressure at 80 °C, and then the resin in the graphite paper was cured under pressure at 130 °C to obtain flexible graphite. base bipolar plate.

[0060] The resin content in the flexible graphite-based bipolar plate is 22.1 wt %...

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Abstract

The invention discloses novel phenolic resin and application thereof in preparation of a flexible graphite-based bipolar plate, and relates to the technical field of bipolar plate processing and manufacturing. The preparation method of the novel phenolic resin comprises the following steps: mixing the raw materials, and carrying out condensation polymerization under the action of an acid catalyst to generate the novel phenolic resin, wherein the raw material components at least comprise phenol and 3-(oxirane-2-yl methoxy) benzaldehyde. The prepared novel phenolic resin is applied to preparation of the bipolar plate, the mechanical property of the bipolar plate is remarkably improved, meanwhile, the conductivity of the bipolar plate can be obviously enhanced, and the air tightness and the acid and alkali resistance are better.

Description

technical field [0001] The invention belongs to the technical field of bipolar plate processing and manufacture, and particularly relates to a novel phenolic resin and its use in preparing flexible graphite-based bipolar plates. Background technique [0002] The bipolar plate is a key component in a proton exchange membrane fuel cell (PEMFC), in which it functions to distribute fuel gas and air, realize the electrical connection between the monolithic cells, remove waste heat from the active area, prevent gas and coolant leakage as well as facilitating functions such as water management in the battery. In recent years, polymer / flexible graphite material has become a suitable fuel cell bipolar plate material due to its low cost, high electrical conductivity, high flexibility, and easy processing. In the prior art, there are two main methods for preparing such bipolar plates by using flexible graphite sheets as raw materials. One is to form a low-density flexible graphite sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/04H01M8/0213H01M8/0221H01M8/0226
CPCC08G8/04H01M8/0213H01M8/0221H01M8/0226
Inventor 汪水方魏丹艺雷沛沅洪侃
Owner 宁波信远材料科技股份有限公司
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