CN114300174A - TOPCon battery silver-aluminum slurry with low viscosity and high wire mesh cleanliness and preparation method thereof - Google Patents
TOPCon battery silver-aluminum slurry with low viscosity and high wire mesh cleanliness and preparation method thereof Download PDFInfo
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- CN114300174A CN114300174A CN202111451899.5A CN202111451899A CN114300174A CN 114300174 A CN114300174 A CN 114300174A CN 202111451899 A CN202111451899 A CN 202111451899A CN 114300174 A CN114300174 A CN 114300174A
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- 230000003749 cleanliness Effects 0.000 title claims abstract description 37
- -1 silver-aluminum Chemical compound 0.000 title claims abstract description 28
- 239000002002 slurry Substances 0.000 title abstract description 4
- 238000002360 preparation method Methods 0.000 title description 10
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000002904 solvent Substances 0.000 claims abstract description 25
- 229920002545 silicone oil Polymers 0.000 claims abstract description 21
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- 239000013008 thixotropic agent Substances 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000007822 coupling agent Substances 0.000 claims abstract description 17
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- 239000011347 resin Substances 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 17
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- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000002105 nanoparticle Substances 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims description 58
- 239000000203 mixture Substances 0.000 claims description 42
- 238000003756 stirring Methods 0.000 claims description 14
- 229910052709 silver Inorganic materials 0.000 claims description 13
- 239000004332 silver Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 10
- QCDWFXQBSFUVSP-UHFFFAOYSA-N 2-phenoxyethanol Chemical compound OCCOC1=CC=CC=C1 QCDWFXQBSFUVSP-UHFFFAOYSA-N 0.000 claims description 7
- UDSFAEKRVUSQDD-UHFFFAOYSA-N Dimethyl adipate Chemical compound COC(=O)CCCCC(=O)OC UDSFAEKRVUSQDD-UHFFFAOYSA-N 0.000 claims description 7
- MUXOBHXGJLMRAB-UHFFFAOYSA-N Dimethyl succinate Chemical compound COC(=O)CCC(=O)OC MUXOBHXGJLMRAB-UHFFFAOYSA-N 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 7
- XTDYIOOONNVFMA-UHFFFAOYSA-N dimethyl pentanedioate Chemical compound COC(=O)CCCC(=O)OC XTDYIOOONNVFMA-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- YEVQZPWSVWZAOB-UHFFFAOYSA-N 2-(bromomethyl)-1-iodo-4-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=CC=C(I)C(CBr)=C1 YEVQZPWSVWZAOB-UHFFFAOYSA-N 0.000 claims description 5
- 239000001856 Ethyl cellulose Substances 0.000 claims description 5
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 5
- 239000004359 castor oil Substances 0.000 claims description 5
- 235000019438 castor oil Nutrition 0.000 claims description 5
- 229920001249 ethyl cellulose Polymers 0.000 claims description 5
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 5
- 150000002193 fatty amides Chemical class 0.000 claims description 5
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 5
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 5
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 claims description 5
- JCTXKRPTIMZBJT-UHFFFAOYSA-N 2,2,4-trimethylpentane-1,3-diol Chemical compound CC(C)C(O)C(C)(C)CO JCTXKRPTIMZBJT-UHFFFAOYSA-N 0.000 claims description 3
- 239000004952 Polyamide Chemical class 0.000 claims description 3
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 3
- 229920002647 polyamide Chemical class 0.000 claims description 3
- 229920000896 Ethulose Polymers 0.000 claims description 2
- 239000001859 Ethyl hydroxyethyl cellulose Substances 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims description 2
- 235000019326 ethyl hydroxyethyl cellulose Nutrition 0.000 claims description 2
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- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
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- LYCAIKOWRPUZTN-NMQOAUCRSA-N 1,2-dideuteriooxyethane Chemical compound [2H]OCCO[2H] LYCAIKOWRPUZTN-NMQOAUCRSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
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- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides TOPCon battery silver-aluminum slurry with low viscosity and high wire mesh cleanliness, which is prepared from the following components in percentage by mass: 1-3% of aluminum powder, 63.5-66.5% of micron-sized spherical silver powder, 15.7-16.4% of submicron-sized spherical silver powder, 3.5-4.2% of nano-sized spherical silver powder, 3-5% of glass powder, 2-4% of resin, 3-5% of solvent, 0.1-0.6% of coupling agent, 0.5-1% of thixotropic agent, 0.1-0.5% of dispersing agent, 0.1-0.5% of plasticizer and 0.1-0.5% of silicone oil. The invention has the advantages of good dispersibility and thixotropy, low viscosity and difficult residue on the screen printing plate.
Description
Technical Field
The invention relates to the technical field of solar cell metallization, in particular to TOPCon cell silver-aluminum paste with low viscosity and high wire mesh cleanliness and a preparation method thereof.
Background
The development of solar energy technology is on the rise, new cell technology and process are continuously emerging, and the current PERC process is finally replaced by a tunneling Oxide layer passivation contact cell of HJT or Topcon (Tunnel Oxide passivation contacts). Compared with HJT, the Topcon technology has the advantages of low cost, good inheritance with PERC technology and the like, and is still the mainstream of solar cell technology in 3-5 years. The conductive paste used for metallization of the front surface of the Topcon battery adopts the glass powder with special shape and material to inhibit and prevent aluminum wedge effect, aluminum-silicon void effect and low-cost silver powder with poor dispersibility, and needs more thixotropic agents to improve the linear aspect ratio of the fine grid, so that the whole paste has poor dispersibility, high viscosity, poor screening performance and more residual paste on the screen printing plate. During continuous printing, the wire mesh is easy to dry, mesh blockage is caused, cells are printed in a virtual mode and lack of printing is caused, the risk of defect generation is increased, the screen printing plate needs to be cleaned at short intervals or in batches, and therefore slurry loss is caused, and production efficiency is seriously affected.
Disclosure of Invention
In order to solve the problems, the invention discloses TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness and a preparation method thereof, and the TOPCon battery silver-aluminum paste has the advantages of good dispersibility and thixotropy, low viscosity and difficulty in residue on a screen printing plate.
The specific scheme is as follows:
a TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness is characterized in that: the paint is prepared from the following components in percentage by mass: 1-3% of aluminum powder, 63.5-66.5% of micron-sized spherical silver powder, 15.7-16.4% of submicron-sized spherical silver powder, 3.5-4.2% of nano-sized spherical silver powder, 3-5% of glass powder, 2-4% of resin, 3-5% of solvent, 0.1-0.6% of coupling agent, 0.5-1% of thixotropic agent, 0.1-0.5% of dispersing agent, 0.1-0.5% of plasticizer and 0.1-0.5% of silicone oil.
As a further improvement of the invention, the particle size of the aluminum powder is 1-10um, the particle size of the micron-sized spherical silver powder is 5-10um, the particle size of the submicron-sized spherical silver powder is 0.3-0.8um, the particle size of the nanometer-sized spherical silver powder is 10-100nm, and the particle size of the glass powder is 1-3 um.
As a further improvement of the invention, the resin is one or more of ethyl cellulose and hydroxyethyl cellulose.
As a further improvement of the invention, the solvent is one or more of triethylene glycol dimethyl ether, ethylene glycol phenyl ether, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate, dimethyl succinate, dimethyl glutarate and dimethyl adipate.
As a further improvement of the invention, the coupling agent is one or more of silane coupling agents KH550, KH560 and KH 570.
As a further improvement of the invention, the thixotropic agent is one or more of modified fatty amide and polyamide modified hydrogenated castor oil derivative.
As a further improvement of the invention, the dispersant is one or more of BYK204 and BYK-ATU.
As a further improvement of the invention, the plasticizer is one or more of trioctyl phosphate and tributyl phosphate.
As a further improvement of the invention, the silicone oil is one or more of dimethyl silicone oil 50CS, 100CS, 350CS, 500CS and 1000 CS.
A preparation method of TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness is characterized by comprising the following steps: the method comprises the following specific steps:
slowly pouring the nano-scale spherical silver powder into the solvent 1 along the wall of the beaker by adopting a constant-temperature stirrer, setting the rotating speed to be 600rpm, setting the temperature to be 25 ℃, stirring for 1 hour, then mixing by using a centrifugal machine, setting the rotating speed to be 1200rpm, setting the temperature to be 25 ℃, and mixing for 30 minutes uniformly to obtain a first mixture;
and (2) adding the thixotropic agent into the solvent 2 by adopting a constant-temperature stirrer, wherein the rotation speed is 1500rpm, the temperature is 80 ℃, and the time is 30 min. Uniformly mixing to obtain a second mixture;
step (3) adding resin, a coupling agent, a dispersing agent, a plasticizer and silicone oil into the first mixture slowly in sequence by adopting a constant-temperature stirrer at normal temperature, setting the rotating speed to be 600rpm, stirring for 1 hour, then using a centrifugal machine to rotate the rotating speed to be 1200rpm, keeping the temperature to be 25 ℃, keeping the time to be 30min, and uniformly mixing to obtain a third mixture;
and (4) finally adding aluminum powder, micron-sized silver powder, submicron-sized spherical silver powder and the second mixture into the third mixture, and mixing by using a three-roll machine, wherein the set rotating speed is 750 rpm. Firstly, mixing for 4 times, wherein the initial roller gap is 80um, and the final roller gap is 40 um; secondly, mixing the primary roller gap of 40um and the final roller gap of 20um for 4 times; thirdly, mixing for 4 times, wherein the primary roller gap is 20um and the final roller gap is 10 um; and step four, mixing the primary roller gap 15um and the final roller gap 7um for 6 times, so that the dispersion is uniform, and the finished silver paste is obtained.
The invention has the beneficial effects that:
1. adopting a dispersing agent: one or more of BYK204 and BYK-ATU is 0.1-0.5%, the dispersibility of the silver powder, the aluminum powder and the glass powder is improved, and the viscosity of the silver paste can be remarkably reduced;
2. adopting a solvent: 3-5% of one or more of triethylene glycol dimethyl ether, ethylene glycol phenyl ether, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate, dimethyl succinate, dimethyl glutarate and dimethyl adipate, so that the cleanliness of the screen printing plate is improved;
3. adopting silicone oil: one or more of 50CS, 100CS, 350CS, 500CS and 1000CS of simethicone 0.1-0.5%, high and low viscosity matching to obtain better screening performance, and proper thixotropic agent matching to obtain better aspect ratio and screen cleanliness.
Drawings
Fig. 1 is a schematic view of the cleanliness of a screen printing plate according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of the cleanliness of the screen printing plate in embodiment 1 of the present invention.
Fig. 3 is a schematic view of the cleanliness of the screen printing plate according to embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of the cleanliness of the screen printing plate in embodiment 1 of the present invention.
Fig. 5 is a schematic diagram of the cleanliness of the screen printing plate in embodiment 1 of the present invention.
FIG. 6 is a schematic diagram of screen cleanliness of a comparative example of the present invention.
Detailed Description
The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
Example 1
The TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness is prepared from the following components in percentage by mass:
aluminum powder (D50: 1 um): 3 percent of
Micron-sized spherical silver powder (D50: 5 um): 63.5 percent of
Submicron spherical silver powder (D50: 0.3 um): 15.7 percent
Nanoscale spherical silver powder (D50: 10 nm): 3.7 percent
Glass frit (D50: 1 um): 5 percent of
Resin: ethyl cellulose 4%
Solvent: 1.5 percent of triethylene glycol dimethyl ether and 1.5 percent of ethylene glycol phenyl ether
Coupling agent: silane coupling agent KH 550: 0.1 percent of
Thixotropic agent: 1% of modified fatty amide
Dispersing agent: BYK 204: 0.5 percent
Plasticizer: 0.1 percent of trioctyl phosphate
Silicone oil: dimethicone 50 CS: 0.2%, 1000 CS: 0.2 percent of
A preparation method of TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness comprises the following specific steps:
and (2) slowly pouring the nano-scale spherical silver powder into the solvent ethylene glycol phenyl ether along the wall of the beaker by adopting a constant-temperature stirrer, setting the rotating speed at 600rpm, keeping the temperature at 25 ℃, and stirring for 1 hour. Then using a centrifuge to mix, rotating at 1200rpm, temperature 25 ℃, time 30 min. Uniformly mixing to obtain a first mixture;
and (2) adding the thixotropic agent into a solvent triethylene glycol dimethyl ether by adopting a constant temperature stirrer, wherein the rotation speed is 1500rpm, the temperature is 80 ℃, and the time is 30 min. Uniformly mixing to obtain a second mixture;
step (3) adding resin, a coupling agent, a dispersing agent, a plasticizer and silicone oil into the first mixture slowly in sequence by adopting a constant-temperature stirrer at normal temperature, setting the rotating speed to be 600rpm, stirring for 1 hour, then using a centrifugal machine to rotate the rotating speed to be 1200rpm, keeping the temperature to be 25 ℃, keeping the time to be 30min, and uniformly mixing to obtain a third mixture;
and (4) finally adding aluminum powder, micron-sized silver powder, submicron-sized spherical silver powder and the second mixture into the third mixture, and mixing by using a three-roll machine, wherein the set rotating speed is 750 rpm. Firstly, mixing for 4 times, wherein the initial roller gap is 80um, and the final roller gap is 40 um; secondly, mixing the primary roller gap of 40um and the final roller gap of 20um for 4 times; thirdly, mixing for 4 times, wherein the primary roller gap is 20um and the final roller gap is 10 um; and step four, mixing for 6 times by using an initial roller gap 15um and a final roller gap 7 um. So that the silver paste is dispersed uniformly to obtain the finished product of silver paste.
Example 2
The TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness is prepared from the following components in percentage by mass:
aluminum powder (D50: 10 um): 1 percent of
Micron-sized spherical silver powder (D50: 10 um): 66.5 percent
Submicron spherical silver powder (D50: 0.8 um): 16.4 percent
Nanoscale spherical silver powder (D50: 100 nm): 4 percent of
Glass frit (D50: 3 um): 3 percent of
Resin: hydroxyethyl cellulose: 3 percent of
Solvent: 2 percent of ethylene glycol phenyl ether and 2 percent of 2,2, 4-trimethyl-1, 3-pentanediol diisobutyrate
Coupling agent: silane coupling agent KH 560: 0.6 percent
Thixotropic agent: 0.5 percent of polyamide modified hydrogenated castor oil derivative
Dispersing agent: BYK-ATU: 0.4 percent
Plasticizer: 0.5 percent of tributyl phosphate
Silicone oil: dimethicone 100 CS: 0.05%, 500 CS: 0.05 percent
A preparation method of TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness comprises the following specific steps:
and (2) slowly pouring the nano-scale spherical silver powder into the solvent ethylene glycol phenyl ether along the wall of the beaker by adopting a constant-temperature stirrer, setting the rotating speed at 600rpm, keeping the temperature at 25 ℃, and stirring for 1 hour. Then using a centrifuge to mix, rotating at 1200rpm, temperature 25 ℃, time 30 min. Uniformly mixing to obtain a first mixture;
and (2) adding the thixotropic agent into the solvent 2,2, 4-trimethyl-1, 3-pentanediol diisobutyrate by adopting a constant-temperature stirrer, wherein the rotation speed is 1500rpm, the temperature is 80 ℃, and the time is 30 min. Uniformly mixing to obtain a second mixture;
step (3) adding resin, a coupling agent, a dispersing agent, a plasticizer and silicone oil into the first mixture slowly in sequence by adopting a constant-temperature stirrer at normal temperature, setting the rotating speed to be 600rpm, stirring for 1 hour, then using a centrifugal machine to rotate the rotating speed to be 1200rpm, keeping the temperature to be 25 ℃, keeping the time to be 30min, and uniformly mixing to obtain a third mixture;
and (4) finally adding aluminum powder, micron-sized silver powder, submicron-sized spherical silver powder and the second mixture into the third mixture, and mixing by using a three-roll machine, wherein the set rotating speed is 750 rpm. Firstly, mixing for 4 times, wherein the initial roller gap is 80um, and the final roller gap is 40 um; secondly, mixing the primary roller gap of 40um and the final roller gap of 20um for 4 times; thirdly, mixing for 4 times, wherein the primary roller gap is 20um and the final roller gap is 10 um; and step four, mixing for 6 times by using an initial roller gap 15um and a final roller gap 7 um. So that the silver paste is dispersed uniformly to obtain the finished product of silver paste.
Example 3
The TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness is prepared from the following components in percentage by mass:
aluminum powder (D50: 3 um): 2 percent of
Micron-sized spherical silver powder (D50: 7.5 um): 65 percent of
Submicron spherical silver powder (D50: 0.5 um): 16.05 percent
Nanoscale spherical silver powder (D50: 50 nm): 3.85 percent
Glass frit (D50: 2 um): 4 percent of
Resin: 1 percent of ethyl cellulose and 1 percent of hydroxyethyl cellulose
Solvent: 2.5% of 2,2, 4-trimethyl-1, 3-pentanediol diisobutyrate and 2.5% of dimethyl succinate
Coupling agent: silane coupling agent KH 570: 0.2 percent of
Thixotropic agent: 0.45% of modified fatty amide and 0.45% of polyamide-modified hydrogenated castor oil derivative
Dispersing agent: BYK 204: 0.1 percent of
Plasticizer: trioctyl phosphate 0.2% and tributyl phosphate 0.2%
Silicone oil: dimethicone 50 CS: 0.25%, 350 CS: 0.25 percent
A preparation method of TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness comprises the following specific steps:
and (2) slowly pouring the nano-scale spherical silver powder into the solvent 2,2, 4-trimethyl-1, 3-pentanediol diisobutyrate along the wall of the beaker by adopting a constant-temperature stirrer, setting the rotating speed to be 600rpm, setting the temperature to be 25 ℃, and stirring for 1 hour. Then using a centrifuge to mix, rotating at 1200rpm, temperature 25 ℃, time 30 min. Uniformly mixing to obtain a first mixture;
and (2) adding the thixotropic agent into the solvent dimethyl succinate by adopting a constant-temperature stirrer, wherein the rotation speed is 1500rpm, the temperature is 80 ℃, and the time is 30 min. Uniformly mixing to obtain a second mixture;
step (3) adding resin, a coupling agent, a dispersing agent, a plasticizer and silicone oil into the first mixture slowly in sequence by adopting a constant-temperature stirrer at normal temperature, setting the rotating speed to be 600rpm, stirring for 1 hour, then using a centrifugal machine to rotate the rotating speed to be 1200rpm, keeping the temperature to be 25 ℃, keeping the time to be 30min, and uniformly mixing to obtain a third mixture;
and (4) finally adding aluminum powder, micron-sized silver powder, submicron-sized spherical silver powder and the second mixture into the third mixture, and mixing by using a three-roll machine, wherein the set rotating speed is 750 rpm. Firstly, mixing for 4 times, wherein the initial roller gap is 80um, and the final roller gap is 40 um; secondly, mixing the primary roller gap of 40um and the final roller gap of 20um for 4 times; thirdly, mixing for 4 times, wherein the primary roller gap is 20um and the final roller gap is 10 um; and step four, mixing for 6 times by using an initial roller gap 15um and a final roller gap 7 um. So that the silver paste is dispersed uniformly to obtain the finished product of silver paste.
Example 4
The TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness is prepared from the following components in percentage by mass:
aluminum powder (D50: 5 um): 1.5 percent
Micron-sized spherical silver powder (D50: 6.5 um): 64.5 percent
Submicron spherical silver powder (D50: 0.6 um): 16.2 percent
Nanoscale spherical silver powder (D50: 80 nm): 4.2 percent of
Glass frit (D50: 2.5 um): 4.5 percent
Resin: ethyl cellulose: 2.5 percent
Solvent: dimethyl succinate 1.5%, dimethyl glutarate 1.5%, dimethyl adipate 1.5%
Coupling agent: silane coupling agent KH 550: 0.15%, KH 560: 0.15 percent
Thixotropic agent: 0.8 percent of modified fatty amide
Dispersing agent: BYK-ATU: 0.2 percent of
Plasticizer: 0.3 percent of trioctyl phosphate
Silicone oil: dimethicone 100 CS: 0.1%, 500 CS: 0.1 percent of
A preparation method of TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness comprises the following specific steps:
and (2) slowly pouring the nano-scale spherical silver powder into a solvent dimethyl succinate along the wall of a beaker by adopting a constant-temperature stirrer, setting the rotating speed at 600rpm, keeping the temperature at 25 ℃, and stirring for 1 hour. Then using a centrifuge to mix, rotating at 1200rpm, temperature 25 ℃, time 30 min. Uniformly mixing to obtain a first mixture;
and (2) adding a thixotropic agent into dimethyl glutarate and dimethyl adipate serving as solvents by adopting a constant-temperature stirrer, wherein the rotation speed is 1500rpm, the temperature is 80 ℃, and the time is 30 min. Uniformly mixing to obtain a second mixture;
step (3) adding resin, a coupling agent, a dispersing agent, a plasticizer and silicone oil into the first mixture slowly in sequence by adopting a constant-temperature stirrer at normal temperature, setting the rotating speed to be 600rpm, stirring for 1 hour, then using a centrifugal machine to rotate the rotating speed to be 1200rpm, keeping the temperature to be 25 ℃, keeping the time to be 30min, and uniformly mixing to obtain a third mixture;
and (4) finally adding aluminum powder, micron-sized silver powder, submicron-sized spherical silver powder and the second mixture into the third mixture, and mixing by using a three-roll machine, wherein the set rotating speed is 750 rpm. Firstly, mixing for 4 times, wherein the initial roller gap is 80um, and the final roller gap is 40 um; secondly, mixing the primary roller gap of 40um and the final roller gap of 20um for 4 times; thirdly, mixing for 4 times, wherein the primary roller gap is 20um and the final roller gap is 10 um; and step four, mixing for 6 times by using an initial roller gap 15um and a final roller gap 7 um. So that the silver paste is dispersed uniformly to obtain the finished product of silver paste.
Example 5
The TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness is prepared from the following components in percentage by mass:
aluminum powder (D50: 7 um): 2.5 percent
Micron-sized spherical silver powder (D50: 8.5 um): 65.5 percent
Submicron spherical silver powder (D50: 0.4 um): 15.9 percent
Nanoscale spherical silver powder (D50: 30 nm): 3.5 percent
Glass frit (D50: 1.5 um): 3.5 percent
Resin: hydroxyethyl cellulose 3.5%
Solvent: 2 percent of dimethyl glutarate and 1.5 percent of dimethyl adipate
Coupling agent: silane coupling agent KH 560: 0.2%, KH 570: 0.2 percent of
Thixotropic agent: polyamide-modified hydrogenated castor oil derivative 0.7%
Dispersing agent: BYK 204: 0.2% BYK-ATU: 0.1 percent of
Plasticizer: 0.2 percent of tributyl phosphate
Silicone oil: dimethyl silicone oil 350 CS: 0.15%, 500 CS: 0.15 percent
A preparation method of TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness comprises the following specific steps:
and (2) slowly pouring the nano-scale spherical silver powder into a solvent dimethyl glutarate along the wall of a beaker by adopting a constant-temperature stirrer, setting the rotating speed at 600rpm, keeping the temperature at 25 ℃, and stirring for 1 hour. Then using a centrifuge to mix, rotating at 1200rpm, temperature 25 ℃, time 30 min. Uniformly mixing to obtain a first mixture;
and (2) adding the thixotropic agent into a solvent dimethyl adipate by adopting a constant-temperature stirrer, wherein the rotation speed is 1500rpm, the temperature is 80 ℃, and the time is 30 min. Uniformly mixing to obtain a second mixture;
step (3) adding resin, a coupling agent, a dispersing agent, a plasticizer and silicone oil into the first mixture slowly in sequence by adopting a constant-temperature stirrer at normal temperature, setting the rotating speed to be 600rpm, stirring for 1 hour, then using a centrifugal machine to rotate the rotating speed to be 1200rpm, keeping the temperature to be 25 ℃, keeping the time to be 30min, and uniformly mixing to obtain a third mixture;
and (4) finally adding aluminum powder, micron-sized silver powder, submicron-sized spherical silver powder and the second mixture into the third mixture, and mixing by using a three-roll machine, wherein the set rotating speed is 750 rpm. Firstly, mixing for 4 times, wherein the initial roller gap is 80um, and the final roller gap is 40 um; secondly, mixing the primary roller gap of 40um and the final roller gap of 20um for 4 times; thirdly, mixing for 4 times, wherein the primary roller gap is 20um and the final roller gap is 10 um; and step four, mixing for 6 times by using an initial roller gap 15um and a final roller gap 7 um. So that the silver paste is dispersed uniformly to obtain the finished product of silver paste.
Comparison results
1. The paste viscosity and thixotropic values, and aspect ratio of the gridlines are compared, see table below:
the viscosity of the examples shown in the table above is lower than that of the comparative examples, and the thixotropic value and aspect ratio are higher, which provides better printability.
2. And (3) comparing the cleanliness of the screen printing plates (see fig. 1-6), so that the cleanliness of the screen printing plates in the embodiment is better than that in the comparative example, the mesh blockage, the virtual printing and the missing printing of the cell can be reduced, and the risk of the defect generation is reduced.
3. Comparison of broken grid number of grid lines
Due to different shutdown time caused by abnormal production, the quantity of broken grid lines after the production is reproduced is compared as shown in the following table:
the embodiment shown in the table above has a significantly smaller number of broken gates than the comparative example, and thus can effectively reduce the risk of defect generation.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (10)
1. A TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness is characterized in that: the paint is prepared from the following components in percentage by mass: 1-3% of aluminum powder, 63.5-66.5% of micron-sized spherical silver powder, 15.7-16.4% of submicron-sized spherical silver powder, 3.5-4.2% of nano-sized spherical silver powder, 3-5% of glass powder, 2-4% of resin, 3-5% of solvent, 0.1-0.6% of coupling agent, 0.5-1% of thixotropic agent, 0.1-0.5% of dispersing agent, 0.1-0.5% of plasticizer and 0.1-0.5% of silicone oil.
2. The TOPCon cell silver aluminum paste of low viscosity and high wire mesh cleanliness as claimed in claim 1, wherein: the particle size of the aluminum powder is 1-10um, the particle size of the micron-sized spherical silver powder is 5-10um, the particle size of the submicron-sized spherical silver powder is 0.3-0.8um, the particle size of the nanoscale spherical silver powder is 10-100nm, and the particle size of the glass powder is 1-3 um.
3. The TOPCon cell silver aluminum paste of low viscosity and high wire mesh cleanliness as claimed in claim 1, wherein: the resin is one or more of ethyl cellulose and hydroxyethyl cellulose.
4. The TOPCon cell silver aluminum paste of low viscosity and high wire mesh cleanliness as claimed in claim 1, wherein: the solvent is one or more of triethylene glycol dimethyl ether, ethylene glycol phenyl ether, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate, dimethyl succinate, dimethyl glutarate and dimethyl adipate.
5. The TOPCon cell silver aluminum paste of low viscosity and high wire mesh cleanliness as claimed in claim 1, wherein: the coupling agent is one or more of silane coupling agents KH550, KH560 and KH 570.
6. The TOPCon cell silver aluminum paste of low viscosity and high wire mesh cleanliness as claimed in claim 1, wherein: the thixotropic agent is one or more of modified fatty amide and polyamide modified hydrogenated castor oil derivatives.
7. The TOPCon cell silver aluminum paste of low viscosity and high wire mesh cleanliness as claimed in claim 1, wherein: the dispersing agent is one or more of BYK204 and BYK-ATU.
8. The TOPCon cell silver aluminum paste of low viscosity and high wire mesh cleanliness as claimed in claim 1, wherein: the plasticizer is one or more of trioctyl phosphate and tributyl phosphate.
9. The TOPCon cell silver aluminum paste of low viscosity and high wire mesh cleanliness as claimed in claim 1, wherein: the silicone oil is one or more of dimethyl silicone oil 50CS, 100CS, 350CS, 500CS and 1000 CS.
10. The method for preparing TOPCon battery silver-aluminum paste with low viscosity and high wire mesh cleanliness according to any one of claims 1-9, wherein the method comprises the following steps: the method comprises the following specific steps:
slowly pouring the nano-scale spherical silver powder into the solvent 1 along the wall of the beaker by adopting a constant-temperature stirrer, setting the rotating speed to be 600rpm, setting the temperature to be 25 ℃, stirring for 1 hour, then mixing by using a centrifugal machine, setting the rotating speed to be 1200rpm, setting the temperature to be 25 ℃, and mixing for 30 minutes uniformly to obtain a first mixture;
step (2) adding the thixotropic agent into the solvent 2 by adopting a constant-temperature stirrer, rotating at 1500rpm, keeping the temperature at 80 ℃ for 30min, and uniformly mixing to obtain a second mixture;
step (3) adding resin, a coupling agent, a dispersing agent, a plasticizer and silicone oil into the first mixture slowly in sequence by adopting a constant-temperature stirrer at normal temperature, setting the rotating speed to be 600rpm, stirring for 1 hour, then using a centrifugal machine to rotate the rotating speed to be 1200rpm, keeping the temperature to be 25 ℃, keeping the time to be 30min, and uniformly mixing to obtain a third mixture;
adding aluminum powder, micron-sized silver powder, submicron-sized spherical silver powder and a second mixture into the third mixture, mixing by using a three-roller machine, setting the rotation speed to be 750rpm, and mixing for 4 times in the first step, wherein the initial roller gap is 80 microns and the final roller gap is 40 microns; secondly, mixing the primary roller gap of 40um and the final roller gap of 20um for 4 times; thirdly, mixing for 4 times, wherein the primary roller gap is 20um and the final roller gap is 10 um; and step four, mixing the primary roller gap 15um and the final roller gap 7um for 6 times, so that the dispersion is uniform, and the finished silver paste is obtained.
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| CN105632588A (en) * | 2016-02-22 | 2016-06-01 | 昆山海斯电子有限公司 | High-conductivity silver paste and preparation method thereof |
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| CN109509568A (en) * | 2017-12-29 | 2019-03-22 | 太原氦舶新材料有限责任公司 | A kind of high-performance conductive silver paste |
| WO2021213189A1 (en) * | 2020-04-21 | 2021-10-28 | 上海宝银电子材料有限公司 | Gray conductive silver paste for automotive glass and preparation method therefor |
| CN113707363A (en) * | 2021-09-01 | 2021-11-26 | 江苏正能电子科技有限公司 | Low-temperature curing conductive silver paste with high tensile force and high conductivity and preparation method thereof |
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Patent Citations (5)
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| CN105632588A (en) * | 2016-02-22 | 2016-06-01 | 昆山海斯电子有限公司 | High-conductivity silver paste and preparation method thereof |
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| CN109509568A (en) * | 2017-12-29 | 2019-03-22 | 太原氦舶新材料有限责任公司 | A kind of high-performance conductive silver paste |
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