CN114582544A - Conductive paste, preparation method and application thereof - Google Patents
Conductive paste, preparation method and application thereof Download PDFInfo
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- CN114582544A CN114582544A CN202210150139.9A CN202210150139A CN114582544A CN 114582544 A CN114582544 A CN 114582544A CN 202210150139 A CN202210150139 A CN 202210150139A CN 114582544 A CN114582544 A CN 114582544A
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- 238000002360 preparation method Methods 0.000 title description 5
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- 239000000843 powder Substances 0.000 claims abstract description 33
- 239000011521 glass Substances 0.000 claims abstract description 31
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- 239000013008 thixotropic agent Substances 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 13
- 239000002270 dispersing agent Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 36
- -1 isocyanate compound Chemical class 0.000 claims description 12
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
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- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 claims description 2
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 2
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- 239000003981 vehicle Substances 0.000 claims description 2
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- 239000002002 slurry Substances 0.000 abstract description 19
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
- 239000010703 silicon Substances 0.000 abstract description 3
- 238000007639 printing Methods 0.000 description 21
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- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
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- 229920000178 Acrylic resin Polymers 0.000 description 1
- 235000021357 Behenic acid Nutrition 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- 241000258920 Chilopoda Species 0.000 description 1
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- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
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- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- DTOSIQBPPRVQHS-PDBXOOCHSA-N alpha-linolenic acid Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC(O)=O DTOSIQBPPRVQHS-PDBXOOCHSA-N 0.000 description 1
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- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 description 1
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- 229960004488 linolenic acid Drugs 0.000 description 1
- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 description 1
- 238000013035 low temperature curing Methods 0.000 description 1
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- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
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- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
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- 229910052714 tellurium Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses conductive paste which comprises the following raw materials in percentage by mass: 88-92% of silver powder, 2-5% of glass powder, 0.1-1% of polyurethane resin, 0.8-9.7% of solvent, 0.1-0.6% of thixotropic agent and 0.1-0.6% of dispersing agent. The organic carrier component provided by the invention is reasonable in formula, is beneficial to improving the rheological property of a slurry system, can obviously improve the linear shaping capacity of the grid lines after being mixed and dispersed into silver paste according to a certain proportion, is narrow in line width after being printed and low in grid breaking proportion, further improves the screen printing quality of the silver paste on a silicon wafer and the aspect ratio of the sintered electrode and the grid lines, and can effectively improve the photoelectric conversion efficiency.
Description
Technical Field
The invention belongs to the technical field of solar cell paste, and particularly relates to conductive paste with excellent printing performance, a preparation method and application thereof.
Background
With the gradual depletion of fossil energy, energy problems have become a limiting factor affecting human survival and development. As one of the ways of utilizing solar energy, solar cells are expected to become an important way for people to develop and acquire energy demands for a long time. The conductive paste is used as a material for metallization of the front surface of the silicon solar cell and mainly comprises conductive functional phase silver powder, bonding phase glass powder and an organic carrier. The organic carrier is generally composed of a solvent, a thixotropic agent, a dispersing agent and other functional additives, and has the main function of dispersing and wetting powder particles in the conductive slurry, so that the slurry has good fluidity and printing manufacturability. The functional additive is a trace substance added according to the process requirements and product modification, has a crucial influence on the manufacturing process and the use performance (such as printing manufacturability) of the conductive paste and the photoelectric conversion efficiency of the solar cell, and is also one of the core technologies of various manufacturers.
For the slurry, the three components are not simply mixed but a complex system, and different formulas of the organic carrier have different viscosity, leveling property and thixotropy, so that the viscosity, the leveling property and the thixotropy of the slurry are influenced, the printing performance and the plasticity of the slurry are further influenced, and the photoelectric conversion efficiency of the solar cell is finally influenced, so that a better formula of the organic carrier is obtained, and the preparation method is one of the keys for preparing the high-quality conductive slurry. Therefore, although the content of the organic carrier in the solar conductive paste is small, the function of the organic carrier is irreplaceable, and the selection and the proportion of the components and various functional additives are particularly important.
In a solar cell, a screen printing method and a photoetching method are commonly used for manufacturing an electrode. The photoetching method can be used for fine processing to obtain high-quality electrode pictures, but the method has the defects of low material utilization rate, complex process, large use amount and the like. The screen printing process is simple, the material utilization rate is high, the cost is low, and the conductive paste is very suitable for batch production, but when the screen printing process is subjected to fine processing (such as the line width is less than 20 micrometers), phenomena such as saw teeth, broken lines, uneven line width of the whole screen are easy to occur, the stretching of a screen mask during printing in the large-scale manufacturing process can cause pattern deformation, the printing shape is poor, and in order to break through the limitation of the fine processing of the screen printing process, the conductive paste with excellent printing shape needs to be developed urgently.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the conductive paste with excellent printing and shaping performances, and the conductive paste meets the requirements of fine and large-scale batch production.
In a first aspect, the invention discloses a conductive silver paste, which adopts the following technical scheme:
the conductive paste comprises the raw material components of silver powder, glass powder and an organic carrier, wherein the organic carrier comprises polyurethane resin, a thixotropic agent, a dispersant and a solvent,
wherein the mass percent of each raw material is as follows:
88-92% of silver powder, 2-5% of glass powder, 0.1-1% of polyurethane resin, 0.8-9.7% of solvent, 0.1-0.6% of thixotropic agent and 0.1-0.6% of dispersing agent.
The organic carrier plays a main role in dispersing and wetting powder particles in the conductive paste, so that the paste has good fluidity and printing manufacturability.
In certain embodiments, the polyurethane resin comprises a urethane structure.
In certain embodiments, the polyurethane resin is obtained by reacting an isocyanate compound with an active hydrogen compound.
In certain embodiments, the isocyanate compound is at least one of diphenylmethane diisocyanate (MDI), Toluene Diisocyanate (TDI).
In certain embodiments, the active hydrogen compound is at least one of an alcohol, water, amine, alcohol amine, phenol, thiol, carboxylic acid, urea.
In certain embodiments, the polyurethane resin has an average molecular weight of 20000 to 80000.
In certain embodiments, the 4-cup coating viscosity of the polyurethane resin is from 40 to 80 seconds.
Wherein the test condition of the 4-cup viscosity of the polyurethane resin is carried out at a constant temperature of 25 +/-1 ℃.
In certain embodiments, the thixotropic agent is at least one of a modified hydrogenated castor oil, a polyamide wax.
The thixotropic agent can enable the paste to have better thixotropy, so that the paste can keep good shape after printing.
In certain embodiments, the dispersant is at least one of a quaternary cationic surfactant, a polyether modified copolymer, a higher fatty acid, BYK180, diko 655.
Among them, the dispersant can improve the anti-settling, stability and fluidity of the slurry.
In certain embodiments, the quaternary ammonium salt cationic surfactant is at least one of dodecyltrimethylammonium chloride, hexadecyltrimethylammonium bromide.
In certain embodiments, the polyether modified copolymer is at least one of a polyether modified polysiloxane, a polyether modified amino silicone oil.
In certain embodiments, the higher fatty acid is at least one of palmitic acid, nacreous acid, stearic acid, oleic acid, linoleic acid, linolenic acid, arachidic acid, behenic acid, and lignitic acid.
In certain embodiments, the solvent is at least one of terpineol, butyl carbitol, diethyl phthalate, alcohol ester-12, butyl carbitol acetate, dimethyl adipate, dimethyl glutarate, ethylene glycol, phenyl ether, and tributyl citrate.
The solvent controls the volatilization rate of the slurry, so that the carrier can be volatilized in a layered manner in the high-temperature sintering process, and uneven holes on the surface of the grid line and cracks possibly generated in concentrated volatilization are prevented.
In a second aspect, the invention discloses a preparation method of conductive silver paste, which comprises the following steps:
fully mixing polyurethane resin, a thixotropic agent, a dispersing agent and a solvent to obtain an organic carrier; the silver powder and the glass powder are uniformly premixed, the organic carrier is added into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase, the mixture is fully and uniformly mixed, and then the mixture is ground and filtered by a three-roller machine to obtain the conductive silver paste.
In a third aspect, the invention discloses an application of the conductive paste in a solar cell.
Compared with the prior art, the invention has the following beneficial effects:
(1) at present, polyurethane resin is basically applied to low-temperature curing type slurry, and the use of polyurethane resin in high-temperature sintering type slurry has never been reported. The polyurethane resin is creatively adopted as an important component of the sintering type slurry, so that on one hand, the slurry has excellent thixotropic property and rheological property, and has the effects of improving the printing property of the slurry, reducing the printing line width of the silver conductive layer and optimizing the line shape. In addition, when the polyurethane resin containing the urethane group (-NH-COO-) is used, the-NCO group contained in the polyurethane resin reacts with the absorbed water on the surface of the attached base material to generate a urea bond, and the urea bond is firmly adhered to the attached base material through a hydrogen bond.
(2) The organic carrier component provided by the invention is reasonable in formula, is beneficial to improving the rheological property of a slurry system, can obviously improve the linear shaping capacity of the grid line after being mixed and dispersed into silver paste according to a certain proportion, further improves the screen printing quality of the silver paste on a silicon wafer and the height-width ratio of the sintered electrode and the grid line, has narrow line width after being printed and low grid breaking proportion, and can effectively improve the photoelectric conversion efficiency.
(3) The conductive paste has excellent printing performance, can solve the limitations of screen printing refinement (the line width is less than 20 mu m) and mass processing production, and is beneficial to realizing the industrial and large-scale production of solar cells.
Drawings
FIG. 1 is a top view of a silver conductive layer after printing of example 3;
FIG. 2 is a top view of the silver conductive layer of comparative example 1 after printing;
FIG. 3 is a perspective view of the silver conductive layer after printing of example 3;
fig. 4 is a perspective view of the silver conductive layer after printing of comparative example 1.
Detailed Description
The following examples are provided to further illustrate the embodiments of the present invention.
The silver powder used in the following examples may be any silver powder known to those skilled in the art, for example, XT-Ag-04 from Shanghai field nanometer Material Ltd; the glass powder can be selected from various glass powders known to those skilled in the art, such as lead tellurium bismuth series glass powder from DuPont company; the polyurethane resin may be TS-8810 available from the company of Santai chemical.
Example 1
According to the mass parts, 0.1 part of polyurethane resin, 0.3 part of modified hydrogenated castor oil, 0.3 part of alkyl ammonium salt type cationic surfactant and 7.3 parts of butyl carbitol are fully and uniformly mixed to obtain an organic carrier; and (3) premixing 90 parts of silver powder and 2 parts of glass powder uniformly, and then adding the organic carrier into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase. Stirring uniformly after each addition, adding the mixture for the next time, stirring uniformly at a high speed after all the addition is finished, grinding the mixture by a three-roller machine to obtain a mixture with the particle size of less than 6 mu m, and filtering to obtain the conductive silver paste.
Example 2
According to the mass parts, 1.0 part of polyurethane resin, 0.3 part of polyamide wax, 0.3 part of BYK180 and 6.4 parts of alcohol ester-12 are fully and uniformly mixed to obtain an organic carrier; and (3) premixing 90 parts of silver powder and 2 parts of glass powder uniformly, and then adding the organic carrier into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase. Stirring uniformly after each addition, adding the mixture for the next time, stirring uniformly at a high speed after all the addition is finished, grinding the mixture by a three-roller machine to obtain the conductive silver paste with the particle size of less than 6 mu m, and filtering to obtain the conductive silver paste.
Example 3
According to the mass parts, 0.4 part of polyurethane resin, 0.3 part of polyamide wax, 0.3 part of digao 655 and 7.0 parts of diethyl phthalate are fully and uniformly mixed to obtain an organic carrier; 92 parts of silver powder and 2 parts of glass powder are uniformly premixed, and then the organic carrier is added into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase. Stirring uniformly after each addition, adding the mixture for the next time, stirring uniformly at a high speed after all the addition is finished, grinding the mixture by a three-roller machine to obtain the conductive silver paste with the particle size of less than 6 mu m, and filtering to obtain the conductive silver paste.
Example 4
According to the mass parts, 0.7 part of polyurethane resin, 0.3 part of thixotropic agent (modified hydrogenated castor oil: polyamide wax is 1:1), 0.3 part of dispersant (BYK180: digao 655 is 1:1) and 7.0 parts of solvent (terpineol: butyl carbitol is 1:1) are fully and uniformly mixed to obtain an organic carrier; and (3) premixing 90 parts of silver powder and 2 parts of glass powder uniformly, and then adding the organic carrier into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase. Stirring uniformly after each addition, then adding the mixture for the next time, stirring uniformly at a high speed after all the mixture is added, finally grinding the mixture by a three-roller machine to obtain the conductive silver paste with the particle size of less than 6 mu m, and filtering.
Example 5
According to the mass parts, 0.8 part of polyurethane resin, 0.6 part of polyamide wax, 0.6 part of BYK180 and 5 parts of ethylene glycol are fully and uniformly mixed to obtain an organic carrier; and uniformly premixing 88 parts of silver powder and 5 parts of glass powder, and then adding the organic carrier into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase. Stirring uniformly after each addition, adding the mixture for the next time, stirring uniformly at a high speed after all the addition is finished, grinding the mixture by a three-roller machine to obtain the conductive silver paste with the particle size of less than 6 mu m, and filtering to obtain the conductive silver paste.
Example 6
According to the mass parts, 1 part of polyurethane resin, 0.1 part of polyamide wax, 0.1 part of digao 655 and 3.8 parts of dimethyl glutarate are fully and uniformly mixed to obtain an organic carrier; 92 parts of silver powder and 3 parts of glass powder are uniformly premixed, and then the organic carrier is added into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase. Stirring uniformly after each addition, adding the mixture for the next time, stirring uniformly at a high speed after all the addition is finished, grinding the mixture by a three-roller machine to obtain the conductive silver paste with the particle size of less than 6 mu m, and filtering to obtain the conductive silver paste.
Comparative example 1
According to the mass parts, 0.4 part of novolac epoxy resin, 0.3 part of polyamide wax, 0.3 part of digao 655 and 7.0 part of diethyl phthalate are fully and uniformly mixed to obtain an organic carrier; 92 parts of silver powder and 2 parts of glass powder are uniformly premixed, and then the organic carrier is added into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase. Stirring uniformly after each addition, then adding the mixture for the next time, stirring uniformly at a high speed after all the mixture is added, finally grinding the mixture by a three-roller machine to obtain the conductive silver paste with the particle size of less than 6 mu m, and filtering.
Comparative example 2
According to the mass parts, 0.05 part of hydroxylated acrylic resin, 0.3 part of modified hydrogenated castor oil, 0.3 part of alkyl ammonium salt type cationic surfactant and 7.35 parts of butyl carbitol are fully and uniformly mixed to obtain an organic carrier; and (3) premixing 90 parts of silver powder and 2 parts of glass powder uniformly, and then adding the organic carrier into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase. Stirring uniformly after each addition, adding the mixture for the next time, stirring uniformly at a high speed after all the addition is finished, grinding the mixture by a three-roller machine to obtain the conductive silver paste with the particle size of less than 6 mu m, and filtering to obtain the conductive silver paste.
Comparative example 3
According to the mass parts, 1.05 parts of saturated polyester resin, 0.3 part of polyamide wax, 0.3 part of BYK180 and 6.35 parts of alcohol ester-12 are fully and uniformly mixed to obtain an organic carrier; and (3) premixing 90 parts of silver powder and 2 parts of glass powder uniformly, and then adding the organic carrier into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase. Stirring uniformly after each addition, adding the mixture for the next time, stirring uniformly at a high speed after all the addition is finished, grinding the mixture by a three-roller machine to obtain the conductive silver paste with the particle size of less than 6 mu m, and filtering to obtain the conductive silver paste.
The raw material components of each example and comparative example are as shown in the following table 1:
TABLE 1 raw material component ratios of examples and comparative examples
And (3) performance testing:
the silver pastes prepared in the examples and the comparative examples are subjected to performance tests, and are subjected to conventional screen printing on a screen printing machine to manufacture solar cells, wherein the performance test data of each example and comparative example are shown in the following table 2:
TABLE 2 Performance test data for examples and comparative examples
Wherein the printed line width is the line width printed when the screen printing plate is designed to be 18 mu m; the broken grid proportion is the number of broken grids on one photovoltaic cell.
At present, the printability and the aspect ratio of the paste are mainly determined by the organic vehicle, if a very good aspect ratio is sought, the viscosity and thixotropic index can be increased by adding thixotropic agents, surfactants or other functional additives, but this method also has certain problems. If the variety of the functional additive is not properly selected, the functional additive can greatly affect the body bone of the paste, and bring problems of solvent expansion, centipede feet and the like, and when the thixotropic property of the paste is improved by using auxiliary agents such as a thixotropic agent, a surfactant and the like, although the shaping of the paste can be obviously improved, the action principle of the chemical substances is that the thixotropic index is usually improved by forming a stronger space network structure, and the viscosity of the silver paste is often unstable.
The polyurethane resin containing the urethane group is used as an important component of the organic carrier, so that the paste has excellent thixotropic property and rheological property, and has the effects of improving the printing property of the paste, reducing the printing line width of the silver conductive layer and optimizing the line shape.
As can be seen from the data in the above table, the only difference between the resin used in example 3 and comparative example 1 is that the line width of comparative example 1 is decreased by 10 μm and the photoelectric conversion efficiency is improved by 0.05-0.1% (for every 2 μm decrease, the photoelectric conversion efficiency is improved by 0.01-0.02%) compared with example 3.
According to the formula disclosed by the invention, the plasticity of the slurry can be improved, so that the slurry has more three-dimensional and full lines, the electrode grid line prepared by the embodiment has high quality, the upper surface of the line is smoother, the edge is neat, and the line type is better, as shown in fig. 1 and fig. 3 and fig. 2 and fig. 4 of comparative example 1. In addition, the paste can realize good printing when being printed on an 18-micron screen printing plate, the printed line width is narrow, the broken grid ratio is low, the aspect ratio of the electrode grid line is obviously superior to that of the comparative example 1, and the photoelectric conversion efficiency can be effectively improved.
In conclusion, the organic carrier component provided by the invention has a reasonable formula, is beneficial to improving the rheological property of a slurry system, can maintain the line width of lines, prevents the lines from diffusing and collapsing, has flat upper edges and good line shape, has good application performance in high-precision crystalline silicon solar front silver slurry, and can realize fine printing and large-scale production.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these should be considered as within the scope of the present invention.
Claims (10)
1. The conductive paste is characterized in that the raw material components comprise silver powder, glass powder and an organic carrier,
the organic carrier comprises polyurethane resin, a thixotropic agent, a dispersant and a solvent,
wherein the mass percent of each raw material is as follows:
88-92% of silver powder, 2-5% of glass powder, 0.1-1% of polyurethane resin, 0.8-9.7% of solvent, 0.1-0.6% of thixotropic agent and 0.1-0.6% of dispersing agent.
2. The conductive paste according to claim 1, wherein the urethane resin contains a urethane structure.
3. The conductive paste according to claim 2, wherein the urethane resin is obtained by reacting an isocyanate compound with an active hydrogen compound.
4. The conductive paste according to claim 3, wherein the isocyanate compound is at least one of diphenylmethane diisocyanate and toluene diisocyanate, and the active hydrogen compound is at least one of alcohol, water, amine, alcohol amine, phenol, thiol, carboxylic acid, and urea.
5. The conductive paste according to claim 3, wherein the polyurethane resin has an average molecular weight of 20000 to 80000 and a paint-4 cup viscosity of 40 to 80 s.
6. The conductive paste according to claim 1, wherein the thixotropic agent is at least one of modified hydrogenated castor oil and polyamide wax.
7. The electroconductive paste according to claim 1, wherein said dispersant is at least one of a quaternary ammonium salt type cationic surfactant, a polyether modified copolymer, a higher fatty acid, BYK180, diko 655.
8. The conductive paste as claimed in claim 1, wherein the solvent is at least one of terpineol, butyl carbitol, diethyl phthalate, alcohol ester-12, butyl carbitol acetate, dimethyl adipate, dimethyl glutarate, ethylene glycol, phenyl ether and tributyl citrate.
9. The method for producing conductive paste according to any one of claims 1 to 8, wherein the urethane resin, the thixotropic agent, the dispersant and the solvent are sufficiently mixed to obtain an organic vehicle; the silver powder and the glass powder are uniformly premixed, the organic carrier is added into the mixture of the silver powder and the glass powder according to the principle of equivalent incremental increase, the mixture is fully and uniformly mixed, and then the mixture is ground and filtered by a three-roller machine to obtain the conductive silver paste.
10. Use of an electroconductive paste according to any one of claims 1 to 8 in a solar cell.
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| CN116285512A (en) * | 2022-12-12 | 2023-06-23 | 广州市儒兴科技股份有限公司 | Organic carrier for slurry, preparation method of organic carrier, conductive slurry and application of conductive slurry |
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