CN109273137B - Low-temperature conductive silver paste for solar HIT (heterojunction with intrinsic thin layer) battery and preparation method thereof - Google Patents
Low-temperature conductive silver paste for solar HIT (heterojunction with intrinsic thin layer) battery and preparation method thereof Download PDFInfo
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 179
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 239000003822 epoxy resin Substances 0.000 claims abstract description 74
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 74
- 239000006185 dispersion Substances 0.000 claims abstract description 51
- 238000001914 filtration Methods 0.000 claims abstract description 49
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 36
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000007787 solid Substances 0.000 claims abstract description 36
- 229910052709 silver Inorganic materials 0.000 claims abstract description 29
- 239000004332 silver Substances 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- 239000012948 isocyanate Substances 0.000 claims abstract description 20
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 20
- VXQBJTKSVGFQOL-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethyl acetate Chemical compound CCCCOCCOCCOC(C)=O VXQBJTKSVGFQOL-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 19
- 239000002904 solvent Substances 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 229920005989 resin Polymers 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 18
- 238000000227 grinding Methods 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 17
- 238000007639 printing Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 16
- 238000004806 packaging method and process Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 6
- 230000009974 thixotropic effect Effects 0.000 claims 1
- 238000009736 wetting Methods 0.000 claims 1
- 238000007650 screen-printing Methods 0.000 abstract description 4
- 229910021417 amorphous silicon Inorganic materials 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910021419 crystalline silicon Inorganic materials 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
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- 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
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Abstract
The invention relates to a low-temperature conductive silver paste for a solar HIT cell and a preparation method thereof, which are carried out according to the following steps: firstly, preparing a high molecular resin carrier, adding 45-50% of solid acrylic acid modified epoxy resin into 50-55% of diethylene glycol butyl ether acetate solvent; secondly, preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1-1.2 mu m and moderate diameter and thickness, adding 87-90% of the silver powder and 8-11% of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding 1.6-1.8% of the secondary carrier, 1.6-1.8% of a closed isocyanate curing agent and 0.3-0.5% of a high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste; the preparation method of the filtering slurry is reasonable in design, and the low-temperature conductive silver slurry is excellent in conductivity, viscosity, printability, tensile force and other performances, and can meet the requirements of screen printing grids of the solar HIT cell.
Description
Technical Field
The invention relates to the field of conductive silver paste, in particular to low-temperature conductive silver paste for a solar HIT (heterojunction with intrinsic thin layer) battery and a preparation method thereof.
Background
Heterojunction HIT (heterojunction with Intrinsic Thin-layer) solar cell (HJT, SHJ, SJT and the like for short) generally takes n-type crystalline silicon as a substrate and amorphous silicon with wide band gap as an emitter, and the cell has a double-sided symmetrical structure, wherein two Thin Intrinsic amorphous silicon layers are arranged on two sides of the n-type silicon substrate, a P-type amorphous silicon emitter layer is arranged on the front side, and an n-type amorphous silicon back surface field is arranged on the back side; and depositing transparent conductive oxide films on the amorphous silicon thin layers on the two sides by a sputtering method, and finally preparing the conductive grid.
The traditional method for preparing the conductive grid electrode by adopting a sputtering method has the defects of high cost, complex process, low efficiency and the like, and because the HIT battery uses a-si to form a PN junction, the HIT battery can be completed at a low temperature of below 200 ℃, the conductive grid electrode of the HIT battery can be prepared by adopting silver paste through a screen printing process at present.
The conductivity, viscosity, printability, tensile force and the like of the silver paste directly influence whether a conductive grid of the HIT battery can be normally used, the conductivity, viscosity, printability and tensile force of the silver paste in the current market are not very superior, the known conductivity is influenced by the content of silver powder in the silver paste, the silver powder cannot form good contact if the content of the silver powder is too small, the silver powder cannot be conductive if the content of the silver powder is lower than a threshold value, the silver powder cannot be easily dispersed and agglomerated if the content of the silver powder is too large, the silver powder is easy to agglomerate and reduce the viscosity, the printability causes that a specific shape is difficult to print, and because the HIT battery is completed at a low temperature of below 200 ℃, a silver powder sintering process is not adopted during silver paste preparation, the silver powder, the silver and the base material are bonded by organic resin, and the tensile force of the silver powder is generally smaller than 1N (the traditional crystalline silicon battery paste is sintered at a high temperature, the silver powder and the base material are mutually connected by surface melting and have large tensile force), and when the pulling force is greater than 1N, the film is easy to tear under stress. Therefore, it is necessary to prepare a low-temperature conductive silver paste which can meet the requirements on conductivity, viscosity, printability and tensile force, and is specially used for HIT batteries.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-temperature conductive silver paste for a solar HIT cell and a preparation method thereof, wherein the low-temperature conductive silver paste has excellent comprehensive performance, and the specific technical scheme is as follows:
a preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 45-50% of solid acrylic acid modified epoxy resin by mass percent into 50-55% of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
secondly, preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1-1.2 mu m and moderate diameter and thickness, adding 87-90% of the silver powder by mass percent and 8-11% of the prepared high-molecular epoxy resin carrier in a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine for grinding and dispersing to obtain a secondary carrier, adding the secondary carrier, 1.6-1.8% of a closed isocyanate curing agent and 0.3-0.5% of a high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
As a preferred embodiment of the present invention, the blocked isocyanate curing agent is capable of being fully deblocked at 150 ℃.
A preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 47 mass percent of solid acrylic acid modified epoxy resin into 53 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1um and moderate diameter thickness, adding 88 mass percent of the silver powder and 10 mass percent of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding the secondary carrier, 1.7 mass percent of the closed isocyanate curing agent and 0.3 mass percent of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
A preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 46 mass percent of solid acrylic acid modified epoxy resin into 54 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1.1um and moderate diameter and thickness, adding 89 mass percent of the silver powder and 9 mass percent of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding the secondary carrier, 1.65 mass percent of the closed isocyanate curing agent and 0.35 mass percent of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
A preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 49 mass percent of solid acrylic acid modified epoxy resin into 51 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1.2 mu m and moderate diameter and thickness, adding 88.5 mass percent of the silver powder and 9.2 mass percent of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding 1.8 mass percent of the secondary carrier, 1.8 mass percent of the closed isocyanate curing agent and 0.5 mass percent of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
A preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 50 mass percent of solid acrylic acid modified epoxy resin into 50 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1um and moderate diameter and thickness, adding 87.5% of the silver powder according to the mass percentage and 10.6% of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding 1.6% of the secondary carrier, 1.6% of the closed isocyanate curing agent and 0.3% of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
A low-temperature conductive silver paste for a solar HIT cell is prepared by the preparation method.
The invention has the beneficial effects that: the preparation method is reasonable in design, and the prepared low-temperature conductive silver paste has excellent performances such as conductivity, viscosity, printability and tensile force, and can meet the requirements of a screen printing grid of a solar HIT cell, and the following table shows that:
Detailed Description
The following further illustrates embodiments of the invention:
the first implementation mode comprises the following steps: a preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 45-50% of solid acrylic acid modified epoxy resin by mass percent into 50-55% of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
secondly, preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1-1.2 mu m and moderate diameter and thickness, adding 87-90% of the silver powder by mass percent and 8-11% of the prepared high-molecular epoxy resin carrier in a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine for grinding and dispersing to obtain a secondary carrier, adding the secondary carrier, 1.6-1.8% of a closed isocyanate curing agent and 0.3-0.5% of a high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
Specifically, the molecular weight of the solid acrylic acid modified epoxy resin is moderate, the bonding of silver powder, diethylene glycol butyl ether acetate and various solvents is facilitated, the curing shrinkage rate is large, the conductivity is improved, the gate electrode can be aged by illumination due to the fact that the HIT battery is exposed to the sun for a long time, the solid acrylic acid modified epoxy resin has excellent ageing resistance, and the stable performance of the gate electrode in an illumination environment is guaranteed. The diethylene glycol butyl ether acetate solvent is used for dissolving the solid acrylic acid modified epoxy resin to prepare the low-viscosity high-molecular epoxy resin carrier, the high-molecular epoxy resin carrier can wet and disperse the silver powder, the rheological property and the drying speed of the silver paste prepared in the later stage are ensured, and the requirements of screen printing are met. The average particle size of the silver powder is 1-1.2 um, the average particle size is moderate, the resistance of the silver paste cannot be increased due to overlarge silver paste, or the silver powder is difficult to be uniformly mixed due to undersize, so that printing is influenced, the silver powder is in a cake shape with moderate diameter and thickness, the surface is smooth, the silver powder is reasonable in material drawing, and the silver powder can be fully mixed with a high-molecular epoxy resin carrier. The high-speed dispersion machine can form strong turbulent flow at local part to uniformly disperse the high-molecular epoxy resin carrier and the silver powder, and a three-roller machine can be used for obtaining a more uniform and high-viscosity carrier. The blocked isocyanate curing agent is completely deblocked at 150 ℃, completely meets the HIT battery process temperature, and is beneficial to curing of silver paste. The macromolecular dispersant can prevent the silver powder from settling and condensing, and is beneficial to silver paste preparation.
The second embodiment: a preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 47 mass percent of solid acrylic acid modified epoxy resin into 53 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1um and moderate diameter thickness, adding 88 mass percent of the silver powder and 10 mass percent of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding the secondary carrier, 1.7 mass percent of the closed isocyanate curing agent and 0.3 mass percent of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
The third embodiment is as follows: a preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 46 mass percent of solid acrylic acid modified epoxy resin into 54 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1.1um and moderate diameter and thickness, adding 89 mass percent of the silver powder and 9 mass percent of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding the secondary carrier, 1.65 mass percent of the closed isocyanate curing agent and 0.35 mass percent of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
The fourth embodiment: a preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 49 mass percent of solid acrylic acid modified epoxy resin into 51 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1.2 mu m and moderate diameter and thickness, adding 88.5 mass percent of the silver powder and 9.2 mass percent of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding 1.8 mass percent of the secondary carrier, 1.8 mass percent of the closed isocyanate curing agent and 0.5 mass percent of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
The fifth embodiment: a preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 50 mass percent of solid acrylic acid modified epoxy resin into 50 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1um and moderate diameter and thickness, adding 87.5% of the silver powder according to the mass percentage and 10.6% of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding 1.6% of the secondary carrier, 1.6% of the closed isocyanate curing agent and 0.3% of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
Embodiment six: a preparation method of low-temperature conductive silver paste for a solar HIT cell comprises the following steps:
firstly, preparing a high molecular resin carrier, adding 47.5 mass percent of solid acrylic acid modified epoxy resin into 52.5 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature until the solid acrylic acid modified epoxy resin is completely dissolved, and filtering and removing impurities by using 400-mesh gauze to obtain the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1.2 mu m and moderate diameter and thickness, adding 89.5 mass percent of the silver powder and 8.2 mass percent of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding the secondary carrier, 1.8 mass percent of the closed isocyanate curing agent and 0.5 mass percent of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
A low-temperature conductive silver paste for a solar HIT cell is prepared by the preparation method.
The above description is for the purpose of describing the invention in more detail with reference to specific preferred embodiments, and it should not be construed that the embodiments of the invention are limited to those described herein, and it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (7)
1. The preparation method of the low-temperature conductive silver paste for the solar HIT cell is characterized by comprising the following steps of:
firstly, preparing a high molecular resin carrier, adding 45-50% of solid acrylic acid modified epoxy resin by mass percent into 50-55% of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
secondly, preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1-1.2 mu m and moderate diameter and thickness, adding 87-90% of the silver powder by mass percent and 8-11% of the prepared high-molecular epoxy resin carrier in the step I into a high-speed dispersion machine, wetting and dispersing the silver powder by the low-viscosity high-molecular epoxy resin carrier, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine for grinding and dispersing to obtain a secondary carrier, adding the secondary carrier, 1.6-1.8% of a closed isocyanate curing agent and 0.3-0.5% of a high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry by using a gauze filtering step with the mesh number corresponding to that of a printing screen to obtain the silk-screen low-temperature conductive silver slurry with single component, wherein the silk-screen low-temperature conductive silver slurry can meet the requirements of the silk-screen grid of the solar HIT cell, the silver content of the silk-screen low-temperature conductive silver slurry is 87% -90%, the viscosity is 260-doped 300pa.s, the thixotropic index is 3.5-4.5, and the resistivity is 6.0 multiplied by 10-6Omega is changed into cm, and the pulling force is more than 1.5N.
2. The method for preparing the low-temperature conductive silver paste for the HIT solar cell according to claim 1, wherein the blocked isocyanate curing agent can be completely deblocked at 150 ℃.
3. The preparation method of the low-temperature conductive silver paste for the solar HIT cell according to claim 1 or 2, wherein the preparation method is carried out according to the following steps:
firstly, preparing a high molecular resin carrier, adding 47 mass percent of solid acrylic acid modified epoxy resin into 53 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1um and moderate diameter thickness, adding 88 mass percent of the silver powder and 10 mass percent of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding the secondary carrier, 1.7 mass percent of the closed isocyanate curing agent and 0.3 mass percent of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
4. The preparation method of the low-temperature conductive silver paste for the solar HIT cell according to claim 1 or 2, wherein the preparation method is carried out according to the following steps:
firstly, preparing a high molecular resin carrier, adding 46 mass percent of solid acrylic acid modified epoxy resin into 54 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1.1um and moderate diameter and thickness, adding 89 mass percent of the silver powder and 9 mass percent of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding the secondary carrier, 1.65 mass percent of the closed isocyanate curing agent and 0.35 mass percent of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
5. The preparation method of the low-temperature conductive silver paste for the solar HIT cell according to claim 1 or 2, wherein the preparation method is carried out according to the following steps:
firstly, preparing a high molecular resin carrier, adding 49 mass percent of solid acrylic acid modified epoxy resin into 51 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1.2 mu m and moderate diameter and thickness, adding 88.5 mass percent of the silver powder and 9.2 mass percent of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding 1.8 mass percent of the secondary carrier, 1.8 mass percent of the closed isocyanate curing agent and 0.5 mass percent of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
6. The preparation method of the low-temperature conductive silver paste for the solar HIT cell according to claim 1 or 2, wherein the preparation method is carried out according to the following steps: firstly, preparing a high molecular resin carrier, adding 50 mass percent of solid acrylic acid modified epoxy resin into 50 mass percent of diethylene glycol butyl ether acetate solvent, heating to 80 ℃, stirring at constant temperature, filtering and removing impurities by using 400-mesh gauze after the solid acrylic acid modified epoxy resin is completely dissolved, and obtaining the low-viscosity high molecular epoxy resin carrier;
preparing silver paste, namely taking cake-shaped silver powder with the average particle size of 1um and moderate diameter and thickness, adding 87.5% of the silver powder according to the mass percentage and 10.6% of the prepared high-molecular epoxy resin carrier into a high-speed dispersion machine, dispersing by the high-speed dispersion machine to obtain a primary uniform carrier, then pouring the carrier into a three-roller machine, grinding and dispersing to obtain a secondary carrier, adding 1.6% of the secondary carrier, 1.6% of the closed isocyanate curing agent and 0.3% of the high-molecular dispersing agent into a planetary mixer, vacuumizing, and removing bubbles to obtain conductive silver paste with the uniform dispersion viscosity of 260-300 pa.s;
filtering the slurry, and packaging the filtered conductive silver slurry to obtain the single-component silk-screen low-temperature conductive silver slurry by using the conductive silver slurry prepared in the step II of filtering by using the gauze with the mesh number corresponding to that of the printing screen plate.
7. A low-temperature conductive silver paste for a solar HIT cell is characterized by being prepared by the preparation method of any one of claims 1 to 6.
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| CN109979686A (en) * | 2019-04-19 | 2019-07-05 | 东莞市银屏电子科技有限公司 | A kind of low-temperature conductive copper slurry and preparation method thereof |
| CN110136863B (en) * | 2019-04-29 | 2020-09-15 | 南通天盛新能源股份有限公司 | Low-temperature conductive silver paste for HIT solar cell and preparation method thereof |
| CN110176325A (en) * | 2019-06-10 | 2019-08-27 | 苏州柏特瑞新材料有限公司 | A kind of low-temperature bake heterojunction solar battery conductive silver paste and preparation method thereof |
| CN114023489B (en) * | 2021-11-03 | 2024-05-03 | 苏州晶银新材料科技有限公司 | Low-temperature silver paste and heterojunction battery |
| CN114496344B (en) * | 2021-12-27 | 2024-07-16 | 宁波维柔电子科技有限公司 | Slurry for Heterojunction (HIT) solar cell |
| CN114550976B (en) * | 2022-04-22 | 2022-08-16 | 西安宏星电子浆料科技股份有限公司 | Conductive silver paste for HIT solar cell |
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