CN114702930B - Novel bonding material for gas diffusion layer and preparation method and application method thereof - Google Patents
Novel bonding material for gas diffusion layer and preparation method and application method thereof Download PDFInfo
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- CN114702930B CN114702930B CN202210128607.2A CN202210128607A CN114702930B CN 114702930 B CN114702930 B CN 114702930B CN 202210128607 A CN202210128607 A CN 202210128607A CN 114702930 B CN114702930 B CN 114702930B
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 88
- 239000000463 material Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 35
- 229920005989 resin Polymers 0.000 claims abstract description 35
- 239000011347 resin Substances 0.000 claims abstract description 35
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000853 adhesive Substances 0.000 claims abstract description 24
- 230000001070 adhesive effect Effects 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 14
- 239000000741 silica gel Substances 0.000 claims abstract description 14
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 239000003054 catalyst Substances 0.000 claims abstract description 13
- 125000000524 functional group Chemical group 0.000 claims abstract description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical class N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 239000011593 sulfur Substances 0.000 claims abstract description 8
- 239000000446 fuel Substances 0.000 claims description 12
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 11
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 11
- 101100446452 Arabidopsis thaliana FD2 gene Proteins 0.000 claims description 8
- 101150029756 petF gene Proteins 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000004132 cross linking Methods 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 2
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 21
- 229920002635 polyurethane Polymers 0.000 description 7
- 239000004814 polyurethane Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- -1 hetero ions Chemical class 0.000 description 2
- GYHFUZHODSMOHU-UHFFFAOYSA-N nonanal Chemical compound CCCCCCCCC=O GYHFUZHODSMOHU-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a novel bonding material for a gas diffusion layer, a preparation method and an application method thereof, wherein the novel bonding material for the gas diffusion layer comprises the following components in parts by weight: 0.5-2 parts of platinum catalyst, 70-200 parts of polyurethane resin, 70-200 parts of tackifying resin, 200-320 parts of solvent, 300-350 parts of adhesive and 10-30 parts of silica gel; the polyurethane resin contains at least one group capable of crosslinking with the functional group in the tackifying resin to form a network structure. The novel bonding material for the gas diffusion layer has the advantages that the coating thickness is smaller than 40 mu m, the bonding viscosity is larger than 900g/25mm, the relative stripping force between the novel bonding material and a back paste is larger than 100g/25mm, the novel bonding material has extremely strong permeability, the novel bonding material can quickly penetrate through a carbon powder layer to be bonded with a base material, the metal impurity ion content is smaller than 10ppm, the Fe content is smaller than 30ppm, no sulfur or ammonia compounds exist, and the gas diffusion layer is ensured to be firmly bonded for a long time and not to fall.
Description
Technical Field
The invention belongs to the technical field of bonding materials, and particularly relates to a novel bonding material for a gas diffusion layer, and a preparation method and an application method thereof.
Background
A fuel cell is an electrochemical system whose main principle is to react fuel with an oxidant at high temperature to generate electricity without combustion under isothermal conditions. In the fuel cell, the gas diffusion layer can play an important role in supporting the catalytic layer, collecting current, conducting gas and discharging water of reaction products, and the high-performance gas diffusion layer material is selected to be beneficial to improving the comprehensive performance of the electrode. However, the existing gas diffusion layer is formed by compounding a carbon powder layer and a PTFE coating, the surface water drop angle is up to 140 degrees, and the carbon powder layer and a base material are poor in adhesive force and easy to fall off. Therefore, the design of a novel bonding material for the gas diffusion layer has a certain practical significance in order to enable the gas diffusion layer to have higher bonding force with the base material, and the popularization and the use of the fuel cell are promoted.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a novel bonding material for a gas diffusion layer, and a preparation method and an application method thereof.
In order to achieve the above purpose and achieve the above technical effects, the invention adopts the following technical scheme:
the novel bonding material for the gas diffusion layer is used for being bonded with a PETF coating on the surface of the gas diffusion layer, and comprises the following components in parts by weight:
0.5-2 parts of platinum catalyst
70-200 parts of polyurethane resin
70-200 parts of tackifying resin
200-320 parts of solvent
300-350 parts of adhesive
10-30 parts of silica gel
The polyurethane resin contains at least one group capable of crosslinking with the functional group in the tackifying resin to form a network structure.
Further, the polyurethane resin contains carboxyl groups, and the stoichiometric ratio of the carboxyl groups can be crosslinked with the functional groups in the tackifying resin to form a network structure.
Further, the viscosity of the polyurethane resin is controlled to 4000-15000 mPa.S, the number average molecular weight is controlled to 20000-60000, and the acidity is controlled to 120-500 equivalent/10 3 Kg。
Further, the tackifying resin contains hydroxyl functional groups, and the stoichiometric ratio of the hydroxyl functional groups can be crosslinked with groups in the polyurethane resin to form a network structure.
Further, the viscosity of the tackifying resin is controlled to 3500-25000 mPa.S.
Furthermore, the thickness of the novel bonding material for the gas diffusion layer is smaller than 40 mu m, the bonding viscosity is larger than 900g/25mm, the relative stripping force between the novel bonding material and the gas diffusion layer is larger than 100g/25mm, the contents of Al and Cu, ni, cd, cr, pb are smaller than 10ppm, the content of Fe is smaller than 30ppm, and no sulfur and ammonia compounds exist.
The invention discloses a preparation method of a novel bonding material for a gas diffusion layer, which comprises the following steps:
according to the weight portions, 0.5 to 2 portions of platinum catalyst, 70 to 200 portions of polyurethane resin, 70 to 200 portions of tackifying resin, 200 to 320 portions of solvent, 300 to 350 portions of adhesive and 10 to 30 portions of silica gel are mixed for 3 to 6 hours by using an ultrasonic stirrer, and after standing for 20 to 25 hours, the mixture is stirred for 3 to 6 hours again, thus obtaining the novel adhesive material for the required gas diffusion layer.
The invention also discloses application of the novel bonding material for the gas diffusion layer in the field of fuel cells.
The invention discloses an application method of a novel bonding material for a gas diffusion layer in the field of fuel cells, which comprises the following steps:
and uniformly coating the gas diffusion layer with a novel bonding material by using a slit coater under the conditions of the temperature of 23+/-2 ℃ and the relative humidity of 50-60RH and hundred-grade dust-free, bonding the novel bonding material on the surface of the gas diffusion layer by using glue or transferring the novel bonding material to the surface of the gas diffusion layer by using a release film, and curing.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a novel bonding material for a gas diffusion layer, a preparation method and an application method thereof, and develops a novel PSA material aiming at the material characteristics of a PETF coating on the surface of the gas diffusion layer, namely, a base material-free platinum catalytic silica gel, wherein the thickness of the novel PSA material is less than 40 mu m, the bonding viscosity is more than 900g/25mm, the relative stripping force with a back paste (PETF coating) is more than 100g/25mm, the novel bonding material has extremely strong permeability, can quickly penetrate through a carbon powder layer to be bonded with the base material, the content of metal hetero ions (Al, cu, ni, cd, cr, pb) is less than 10ppm, the Fe content is less than 30ppm, sulfur and ammonia compounds are not contained, and the long-time firm bonding of the gas diffusion layer can be ensured.
Detailed Description
The present invention is described in detail below so that advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and unambiguous the scope of the present invention.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
In the description of the present invention, the terms "inner", "outer", "vertical", "lateral", "upper", "lower", "top", "bottom", and the like refer to an azimuth or a positional relationship, and are merely for convenience of describing the present invention, not to require that the present invention must be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
On one hand, the invention provides a novel bonding material for a gas diffusion layer, which is used for being attached to a PETF coating on the surface of the gas diffusion layer, and the novel bonding material for the gas diffusion layer has extremely strong permeability, can quickly pass through a carbon powder layer on the gas diffusion layer to be bonded with a base material, and is not easy to fall off.
The novel bonding material for the gas diffusion layer comprises the following components in parts by weight:
0.5-2 parts of platinum catalyst
70-200 parts of polyurethane resin
70-200 parts of tackifying resin
200-320 parts of solvent
300-350 parts of adhesive
10-30 parts of silica gel
The polyurethane resin contains at least one group capable of crosslinking with the functional group in the tackifying resin to form a network structure.
The polyurethane resin contains carboxyl groups, the stoichiometric ratio of which can crosslink with functional groups in the tackifying resin, and the tackifying resin contains hydroxyl functional groups, and the stoichiometric ratio of which can crosslink with the groups in the polyurethane resin.
The viscosity of polyurethane resin is controlled to 4000-15000 mPa.S, the number average molecular weight is controlled to 20000-60000, and the acidity is controlled to 120-500 equivalent/10 3 Kg。
The viscosity of the tackifying resin is controlled to be 3500-25000 mPa.S.
On the other hand, the invention also discloses a preparation method of the novel bonding material for the gas diffusion layer, which comprises the following steps:
according to parts by weight, 0.5-2 parts of platinum catalyst, 70-200 parts of polyurethane resin, 70-200 parts of tackifying resin, 200-320 parts of solvent, 300-350 parts of adhesive and 10-30 parts of silica gel are mixed for 3-6 hours by using an ultrasonic stirrer, and after standing for 20-25 hours, the mixture is stirred for 3-6 hours again to obtain the novel bonding material for the required gas diffusion layer, the thickness of the novel bonding material for the gas diffusion layer coated on the surface of the gas diffusion layer is less than 40 mu m, the bonding viscosity is more than 900g/25mm, the relative stripping force between the novel bonding material and the gas diffusion layer is more than 100g/25mm, the Al content and the Cu, ni, cd, cr, pb content are less than 10ppm, the Fe content is less than 30ppm, and no sulfur and ammonia compounds are produced.
The invention also discloses an application of the novel bonding material for the gas diffusion layer in the field of fuel cells and an application method thereof, wherein the application method comprises the following steps:
and uniformly coating the gas diffusion layer with a novel bonding material by using a slit coater under the conditions of the temperature of 23+/-2 ℃ and the relative humidity of 50-60RH and hundred-grade dust-free, bonding the novel bonding material on the surface of the gas diffusion layer by using glue or transferring the novel bonding material to the surface of the gas diffusion layer by using a release film, and curing.
The solvent adopts environment-friendly ethyl acetate.
The adhesive adopts a non-aldehyde adhesive, is environment-friendly and healthy, has no toxic or harmful effect on human bodies, and is preferably a polyurethane adhesive or an acrylic ester adhesive.
Example 1
The novel bonding material for the gas diffusion layer is used for being bonded with a PETF coating on the surface of the gas diffusion layer, and comprises the following components in parts by weight:
platinum catalyst 1 part
75 parts of polyurethane resin
75 parts of tackifying resin
300 parts of ethyl acetate solvent
330 parts of polyurethane adhesive
20 parts of silica gel
The polyurethane resin contains at least one group capable of crosslinking with a functional group in the tackifying resin, and forms a network structure by crosslinking.
The viscosity of the polyurethane resin is controlled to 10000 mPa.S, the number average molecular weight is controlled to 50000, and the acidity is controlled to 500 equivalent/10 3 Kg, the polyurethane resin contains carboxyl groups, the stoichiometric ratio of which can be used for tackifyingThe functional groups in the resin crosslink to form a network structure.
The viscosity of the tackifying resin is controlled to 20000 mPa.S, the tackifying resin contains hydroxyl functional groups, and the stoichiometric ratio of the hydroxyl functional groups can be crosslinked with groups in the polyurethane resin to form a network structure.
The embodiment also discloses a preparation method of the novel bonding material for the gas diffusion layer, which comprises the following steps:
according to the parts by weight, 1 part of platinum catalyst, 75 parts of polyurethane resin, 75 parts of tackifying resin, 300 parts of ethyl acetate solvent, 330 parts of polyurethane adhesive and 20 parts of silica gel are mixed for 5 hours by using an ultrasonic stirrer, and after standing for 24 hours, the mixture is stirred for 5 hours again to obtain the novel bonding material for the required gas diffusion layer, wherein the novel bonding material for the gas diffusion layer is coated on the surface of the gas diffusion layer, the thickness is smaller than 40 mu m, the bonding viscosity is more than 900g/25mm, the relative stripping force between the novel bonding material and the gas diffusion layer is more than 100g/25mm, the Al content and the Cu, ni, cd, cr, pb content are less than 10ppm, the Fe content is less than 30ppm, and no sulfur and ammonia compounds are generated.
The embodiment also discloses an application of the novel bonding material for the gas diffusion layer in the field of fuel cells and an application method thereof, wherein the application method comprises the following steps:
and uniformly coating the novel bonding material for the gas diffusion layer on the surface of the gas diffusion layer by using a slit coater under the conditions of 23 ℃ and 50RH and hundred-grade dust-free conditions, and curing.
Example 2
The novel bonding material for the gas diffusion layer is used for being bonded with a PETF coating on the surface of the gas diffusion layer and comprises the following components in parts by weight:
platinum catalyst 1 part
200 parts of polyurethane resin
200 parts of tackifying resin
320 parts of ethyl acetate solvent
350 parts of polyurethane adhesive
30 parts of silica gel
The polyurethane resin contains carboxyl groups, the stoichiometric ratio of the carboxyl groups can be crosslinked with the functional groups in the tackifying resin, the tackifying resin contains hydroxyl functional groups, and the stoichiometric ratio of the hydroxyl groups can be crosslinked with the groups in the polyurethane resin, so that a network structure is formed through crosslinking.
The viscosity of polyurethane resin is controlled to 4000-15000 mPa.S, the number average molecular weight is controlled to 20000-60000, and the acidity is controlled to 120-500 equivalent/10 3 Kg, the viscosity of the tackifying resin is controlled between 3500 and 25000 mPa.S.
A preparation method of a novel bonding material for a gas diffusion layer comprises the following steps:
according to the parts by weight, mixing 0.5 part of platinum catalyst, 200 parts of polyurethane resin, 200 parts of tackifying resin, 320 parts of ethyl acetate solvent, 350 parts of polyurethane adhesive and 30 parts of silica gel for 5 hours by using an ultrasonic stirrer, standing for 25 hours, and stirring for 5 hours again to obtain the novel bonding material for the required gas diffusion layer, wherein the thickness of the novel bonding material for the gas diffusion layer coated on the surface of the gas diffusion layer is smaller than 40 mu m, the bonding viscosity is larger than 900g/25mm, the relative stripping force between the novel bonding material and the gas diffusion layer is larger than 100g/25mm, the Al content and the Cu, ni, cd, cr, pb content are smaller than 10ppm, the Fe content is smaller than 30ppm, and the novel bonding material is free of sulfur and ammonia compounds.
The embodiment discloses an application of a novel bonding material for a gas diffusion layer in the field of fuel cells and an application method thereof, wherein the application comprises the following steps:
and uniformly coating the novel bonding material for the gas diffusion layer on the surface of the gas diffusion layer by using a slit coater under the conditions of the temperature of 25 ℃ and the relative humidity of 55RH and hundred-grade dust-free conditions, and curing.
Example 1 was followed.
Example 3
The novel bonding material for the gas diffusion layer is used for being bonded with a PETF coating on the surface of the gas diffusion layer and comprises the following components in parts by weight:
platinum catalyst 2 parts
100 parts of polyurethane resin
Tackifying resin 100 parts
200 parts of ethyl acetate solvent
Polyurethane adhesive 300 parts
10 parts of silica gel
The polyurethane resin contains carboxyl groups, the stoichiometric ratio of the carboxyl groups can be crosslinked with the functional groups in the tackifying resin, the tackifying resin contains hydroxyl functional groups, and the stoichiometric ratio of the hydroxyl groups can be crosslinked with the groups in the polyurethane resin, so that a network structure is formed through crosslinking.
The viscosity of polyurethane resin is controlled to 4000-15000 mPa.S, the number average molecular weight is controlled to 20000-60000, and the acidity is controlled to 120-500 equivalent/10 3 Kg, the viscosity of the tackifying resin is controlled between 3500 and 25000 mPa.S.
A preparation method of a novel bonding material for a gas diffusion layer comprises the following steps:
according to parts by weight, 0.5-2 parts of platinum catalyst, 70-200 parts of polyurethane resin, 70-200 parts of tackifying resin, 200-320 parts of ethyl acetate solvent, 300-350 parts of polyurethane adhesive and 10-30 parts of silica gel are mixed for 3-6 hours by using an ultrasonic stirrer, and after standing for 20-25 hours, the mixture is stirred for 3-6 hours again to obtain the novel bonding material for the required gas diffusion layer, the novel bonding material for the gas diffusion layer is coated on the surface of the gas diffusion layer, the thickness of the novel bonding material for the gas diffusion layer is less than 40 mu m, the bonding viscosity is more than 900g/25mm, the relative stripping force between the novel bonding material and the gas diffusion layer is more than 100g/25mm, the Al and Cu, ni, cd, cr, pb contents are all less than 10ppm, the Fe content is less than 30ppm, and no sulfur and ammonia compounds are produced.
The embodiment discloses an application of a novel bonding material for a gas diffusion layer in the field of fuel cells and an application method thereof, wherein the application comprises the following steps:
and uniformly coating the novel bonding material for the gas diffusion layer on the surface of the gas diffusion layer by using a slit coater under the conditions of the temperature of 25 ℃ and the relative humidity of 55RH and hundred-grade dust-free conditions, and curing.
Example 1 was followed.
Comparative example 1
The obtained adhesive material for gas diffusion layers is commercially available.
The performance of examples 1 to 3 and comparative example 1 was evaluated according to the existing test criteria, and the test results are shown in Table 1.
TABLE 1
As is clear from table 1, the novel adhesive for gas diffusion layers of the present invention has better adhesion performance than the conventional products, and has a large relative peeling force with respect to the gas diffusion layer, and is less likely to cause detachment even after long-term use, and has a low metal impurity content.
Parts or structures of the present invention, which are not specifically described, may be existing technologies or existing products, and are not described herein.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (5)
1. The bonding material for the gas diffusion layer is characterized by being used for being bonded with a PETF coating on the surface of the gas diffusion layer, and comprises the following components in parts by weight:
0.5-2 parts of platinum catalyst
70-200 parts of polyurethane resin
70-200 parts of tackifying resin
200-320 parts of solvent
300-350 parts of adhesive
10-30 parts of silica gel
The polyurethane resin contains carboxyl groups, and the stoichiometric ratio of the carboxyl groups can be crosslinked with functional groups in the tackifying resin to form a network structure;
the tackifying resin contains hydroxyl functional groups, and the stoichiometric ratio of the hydroxyl functional groups can be crosslinked with carboxyl groups in the polyurethane resin;
the viscosity of the polyurethane resin is controlled to 4000-15000 mPa.S, the number average molecular weight is controlled to 20000-60000, and the acidity is controlled to 120-500 equivalent/10 3 Kg；
The viscosity of the tackifying resin is controlled to be 3500-25000 mPa.S.
2. The bonding material for gas diffusion layers according to claim 1, wherein the bonding material for gas diffusion layers has a thickness of less than 40 μm, a bonding viscosity of > 900g/25mm, a relative peeling force with respect to the gas diffusion layers of more than 100g/25mm, al and Cu, ni, cd, cr, pb contents of < 10ppm, fe content of < 30ppm, and no sulfur or ammonia compounds.
3. The method for producing an adhesive material for a gas diffusion layer according to claim 1 or 2, comprising the steps of:
mixing 0.5-2 parts of platinum catalyst, 70-200 parts of polyurethane resin, 70-200 parts of tackifying resin, 200-320 parts of solvent, 300-350 parts of adhesive and 10-30 parts of silica gel for 3-6 hours by using an ultrasonic stirrer, standing for 20-25 hours, and stirring for 3-6 hours again to obtain the adhesive material for the required gas diffusion layer.
4. Use of an adhesive material for gas diffusion layers according to claim 1 or 2 in the field of fuel cells.
5. The method for applying the bonding material for gas diffusion layers to the field of fuel cells according to claim 4, comprising the steps of:
and uniformly coating the bonding material for the gas diffusion layer on the surface of the gas diffusion layer by using a slit coater or bonding the bonding material on the surface of the gas diffusion layer by using glue or transferring the bonding material to the surface of the gas diffusion layer by using a release film under the dust-free condition of the relative humidity of 50-60RH and hundred grades at the temperature of 23+/-2 ℃ and curing the bonding material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210128607.2A CN114702930B (en) | 2022-02-11 | 2022-02-11 | Novel bonding material for gas diffusion layer and preparation method and application method thereof |
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| CN114702930B true CN114702930B (en) | 2024-03-01 |
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| JP2004359866A (en) * | 2003-06-05 | 2004-12-24 | Nicca Chemical Co Ltd | Aqueous polyurethane resin composition, and adhesive containing the same |
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| WO2014010524A1 (en) * | 2012-07-11 | 2014-01-16 | タツタ電線株式会社 | Curable electroconductive adhesive composition, electromagnetic shielding film, electroconductive adhesive film, adhesion method, and circuit board |
| JP2018188630A (en) * | 2017-05-01 | 2018-11-29 | 積水化学工業株式会社 | Adhesive tape |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3058153B1 (en) * | 2016-10-28 | 2018-11-16 | Bostik Sa | SELF-ADHESIVE COMPOSITION FOR BONDING LOW ENERGY SURFACE SUBSTRATES |
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- 2022-02-11 CN CN202210128607.2A patent/CN114702930B/en active Active
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|---|---|---|---|---|
| JP2004359866A (en) * | 2003-06-05 | 2004-12-24 | Nicca Chemical Co Ltd | Aqueous polyurethane resin composition, and adhesive containing the same |
| CN102433094A (en) * | 2011-10-19 | 2012-05-02 | 常州市宝丽胶粘剂有限公司 | Preparation of novel adhesive for low-surface-energy substrate |
| WO2014010524A1 (en) * | 2012-07-11 | 2014-01-16 | タツタ電線株式会社 | Curable electroconductive adhesive composition, electromagnetic shielding film, electroconductive adhesive film, adhesion method, and circuit board |
| JP2018188630A (en) * | 2017-05-01 | 2018-11-29 | 積水化学工業株式会社 | Adhesive tape |
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| CN114702930A (en) | 2022-07-05 |
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