CN110246604B - Preparation method of fine line high aspect ratio screen printing slurry - Google Patents
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- 238000007650 screen-printing Methods 0.000 title claims abstract description 32
- 239000002002 slurry Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000011521 glass Substances 0.000 claims abstract description 38
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 37
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- 238000000034 method Methods 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 9
- 239000013008 thixotropic agent Substances 0.000 claims description 9
- 239000002270 dispersing agent Substances 0.000 claims description 8
- 239000004952 Polyamide Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 229920002647 polyamide Polymers 0.000 claims description 6
- UDSFAEKRVUSQDD-UHFFFAOYSA-N Dimethyl adipate Chemical compound COC(=O)CCCCC(=O)OC UDSFAEKRVUSQDD-UHFFFAOYSA-N 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000004359 castor oil Substances 0.000 claims description 4
- 235000019438 castor oil Nutrition 0.000 claims description 4
- 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 4
- HJOVHMDZYOCNQW-UHFFFAOYSA-N isophorone Chemical compound CC1=CC(=O)CC(C)(C)C1 HJOVHMDZYOCNQW-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 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
- VXQBJTKSVGFQOL-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethyl acetate Chemical compound CCCCOCCOCCOC(C)=O VXQBJTKSVGFQOL-UHFFFAOYSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 claims description 2
- 150000001412 amines Chemical class 0.000 claims description 2
- 150000004982 aromatic amines Chemical class 0.000 claims description 2
- 239000000440 bentonite Substances 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 150000002148 esters Chemical class 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 229910021485 fumed silica Inorganic materials 0.000 claims description 2
- 239000003350 kerosene Substances 0.000 claims description 2
- 239000002736 nonionic surfactant Substances 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920005862 polyol Polymers 0.000 claims description 2
- 229940116411 terpineol Drugs 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 abstract description 15
- 238000007639 printing Methods 0.000 abstract description 14
- 239000011347 resin Substances 0.000 abstract description 10
- 229920005989 resin Polymers 0.000 abstract description 10
- 238000007599 discharging Methods 0.000 abstract description 2
- 229910052709 silver Inorganic materials 0.000 description 21
- 239000004332 silver Substances 0.000 description 21
- 238000001723 curing Methods 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 description 4
- 229910021419 crystalline silicon Inorganic materials 0.000 description 4
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 3
- 239000000969 carrier Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013035 low temperature curing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- DAFHKNAQFPVRKR-UHFFFAOYSA-N (3-hydroxy-2,2,4-trimethylpentyl) 2-methylpropanoate Chemical compound CC(C)C(O)C(C)(C)COC(=O)C(C)C DAFHKNAQFPVRKR-UHFFFAOYSA-N 0.000 description 2
- 239000001856 Ethyl cellulose Substances 0.000 description 2
- 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 description 2
- LZBCVRCTAYKYHR-UHFFFAOYSA-N acetic acid;chloroethene Chemical compound ClC=C.CC(O)=O LZBCVRCTAYKYHR-UHFFFAOYSA-N 0.000 description 2
- 235000019325 ethyl cellulose Nutrition 0.000 description 2
- 229920001249 ethyl cellulose Polymers 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229920000136 polysorbate Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 240000009087 Crescentia cujete Species 0.000 description 1
- 235000005983 Crescentia cujete Nutrition 0.000 description 1
- 235000009797 Lagenaria vulgaris Nutrition 0.000 description 1
- 229920001213 Polysorbate 20 Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 description 1
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 description 1
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 description 1
- 229920000053 polysorbate 80 Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Abstract
The invention adopts vinyl chloride-vinyl acetate copolymer as a resin system, and provides a preparation method of fine line high aspect ratio screen printing slurry, which comprises the steps of mixing an organic carrier with glass powder to obtain glass slurry; and then adding silver powder into the glass paste to obtain the preparation method of the fine-line high-aspect-ratio screen printing paste. The conductive paste prepared by the invention has good screen discharging property and excellent shaping property, can be suitable for 430/13 mesh screen printing with the opening of the lowest 28 mu m, can be suitable for non-mesh screen printing with the opening of the lowest 22 mu m, and has excellent printing property and high aspect ratio of printed lines.
Description
Technical Field
The invention relates to the technical field of manufacturing of conductive silver paste applicable to screen printing, in particular to a silicon solar cell, in particular to conductive paste applicable to fine line high aspect ratio, and particularly relates to a preparation method of fine line high aspect ratio screen printing paste.
Technical Field
The screen printing process is an important process in the production process of the silicon solar cell, and each electrode is manufactured by printing conductive paste on a silicon wafer by using the screen printing process and performing a sintering process. Since screen printing is an inline operation, it is required that the paste used maintain stable viscosity, good screen-off property and shaping property in continuous and long-time printing.
The conversion rate is the most critical index for evaluating the solar cell, and the higher the conversion rate, the better the conversion rate, and in various schemes for improving the slurry and the conversion rate, the main method is to reduce the width of the lines and the height of the lines, namely, to improve the aspect ratio (electrode thickness/electrode line width) of the lines so as to reduce the series resistance of the cell sheet and improve the short-circuit current. More specifically, when the width of the printed lines is reduced, the light receiving area of the battery piece can be increased, meanwhile, the heights of the lines are increased, the series resistance of the battery piece can be reduced, the effective flow of current is ensured, and therefore the conversion efficiency of the battery piece is improved.
In response to the above requirements, manufacturers of solar cells are continuously reducing the width of the fine grid when printing the cells from 35 μm openings to 28 μm, so as to 24 μm openings. As the openings of printing screens decrease, the demand for paste becomes higher and higher. Finer openings require good net-dropping performance of the slurry, otherwise net blocking phenomenon occurs, and normal production is affected; the slurry is required to keep certain viscosity under high-speed printing shearing, and too low viscosity can cause the diffusion phenomenon at the edge of the printed line to influence the conversion rate; the paste is required to have good shaping property so as to ensure that the printed lines have enough height, thereby reducing the series resistance of the paste and improving the short-circuit current; meanwhile, the slurry is required to have certain leveling property, so that the upper surface of the slurry can be automatically leveled after printing is finished, and the phenomenon of fluctuation can not occur, so that the performance of the slurry is ensured.
The current conductive paste cannot fully meet the above requirements, mainly the paste organic carrier system has certain defects, and a large amount of paste uses cellulose systems with different series and different viscosities, so that the viscosity, the shaping property and the net-falling property of the paste cannot be perfectly balanced. In addition, in the prior art, the vinyl chloride-vinyl acetate copolymer is generally used in halogen low-temperature curing type silver paste, the use process of the silver paste is 150 ℃ low-temperature baking curing, the use process of crystalline silicon solar silver paste is 780 ℃ high-temperature sintering, the two silver pastes have essential differences, and the low-temperature curing type silver paste cannot be used in solar cell production.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention adopts the vinyl chloride-vinyl acetate copolymer as a resin system and provides the conductive paste suitable for fine-line high-aspect-ratio screen printing and the preparation method thereof. The conductive paste prepared by the invention has good screen discharging property and excellent shaping property, can be suitable for 430/13 mesh screen printing with the opening of the lowest 28 mu m, can be suitable for non-mesh screen printing with the opening of the lowest 22 mu m, and has excellent printing property and high aspect ratio of printed lines.
The technical scheme of the invention is as follows:
The preparation method of the fine line high aspect ratio screen printing paste comprises the following steps of mixing an organic carrier and glass powder to obtain glass paste; and adding silver powder into the glass paste to obtain fine-line high-aspect-ratio screen printing paste for preparing the front electrode of the solar cell.
In the invention, the silver powder, the glass powder and the organic carrier are as follows by weight percent:
80-93% of silver powder
0.1-5% Of glass powder
5-18% Of organic carrier
Preferably:
85-91% of silver powder
1.5 To 3.5 percent of glass powder
7-11.5% Of organic carrier.
In the invention, the sum of the consumption of the conductive phase silver powder, the inorganic phase glass powder and the organic phase organic carrier is 100 percent.
In the invention, the organic carrier consists of the following raw materials in percentage by weight:
0.5-3% of curing agent
10-25% Of plasticizer
0.1-5% Of vinyl chloride-vinyl acetate copolymer
Thixotropic agent 0.1-2%
0.1-5% Of dispersing agent
0.1 To 5 percent of leveling agent
The balance being solvent.
The total amount of the raw materials of the organic carrier is 100 percent.
Preferably, the organic carrier is composed of the following raw materials in percentage by weight:
1-2% of curing agent
18-22% Of plasticizer
2-4% Of vinyl chloride-vinyl acetate copolymer
Thixotropic agent 0.2-0.8%
1-3% Of dispersing agent
4-5% Of leveling agent
The balance being solvent.
Preferably, the D50 particle size of the silver powder is 0.8-2.5 mu m, and the tap density is 5.0-6.7 g/ml.
Preferably, the D50 particle size of the glass powder is 0.5-2.0 μm, and the Tg is 200-550 ℃.
Preferably, the curing agent is one or more of an aliphatic amine curing agent, an aromatic amine curing agent and an amidoamine curing agent; more preferably, the curing agent is one or more of SBN-70D, MF-B60X, MF-K60X, E402-90T, E405-80T, AE-100, A201H, TPA-B80X.
Preferably, the leveling agent is an organosilicon leveling agent and/or an acrylate leveling agent. More preferably, the leveling agent is one or more of BYK-378、BYK-349、BYK-333、BYK-354、BYK-3521、BYK-371、BYK-3520、TEGO-425、TEGO-500、 TEGO-440 TEGO-450、DC29、DC51、DC57 and the like
Preferably, the plasticizer is one or more of a polyol ester plasticizer, a phosphate ester plasticizer, a phthalate ester plasticizer, and a fatty acid ester plasticizer.
Preferably, the thixotropic agent is one or more of hydrogenated castor oil, polyamide modified hydrogenated castor oil, polyamide wax slurry, polyethylene wax slurry, fumed silica and bentonite.
Preferably, the dispersant is a nonionic surfactant; more preferably one or more of Tween 20, tween 80, sorbitan ester, alkylphenol ethoxylates, and fatty amine ethoxylates.
Preferably, the vinyl chloride-vinyl acetate copolymer is one or more of fat-soluble binary vinyl chloride-vinyl acetate copolymer, ternary carboxyl modified vinyl chloride-vinyl acetate copolymer and ternary hydroxyl modified vinyl chloride-vinyl acetate copolymer; more preferably, the vinyl chloride-vinyl acetate copolymer is selected from one or more of MLC-20, MLC-14-40, MLC-14-55, YSZ-744 and (M) VAM, VMA, VMC, MAVD, MVAH, MVOH; preferably, the vinyl acetate content of the vinyl chloride-vinyl acetate copolymer is 17, the K value is 32-34, and the average molecular weight is 15000.
Preferably, the solvent is one or more of 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, diethylene glycol butyl ether acetate, dimethyl adipate, terpineol, kerosene, mixed dibasic acid ester DBE and isophorone, preferably 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate and dimethyl adipate.
According to the technical scheme, the preparation method of the organic carrier comprises the steps of uniformly mixing the vinyl chloride-vinyl acetate copolymer, the curing agent, the plasticizer, the leveling agent, the dispersing agent, the thixotropic agent and the solvent, and stirring at 30-70 ℃ for 0.5-1 h to obtain the organic carrier.
In the technical scheme, the preparation method of the glass slurry comprises the steps of adding glass powder into an organic carrier, stirring, dispersing and three-roller to obtain the glass slurry; preferably, the fineness of the glass paste is less than 5 μm, and the glass paste is in the form of a paste.
In the invention, the viscosity of the fine line high aspect ratio screen printing paste for the solar cell is 270-320 Pa.s, and the fineness is less than 5 mu m.
The preparation method of the fine line high aspect ratio screen printing paste for the solar cell comprises the following specific steps:
(1) Preparation of organic Carriers
Uniformly mixing the vinyl chloride-vinyl acetate copolymer with a curing agent, a plasticizer, a leveling agent, a dispersing agent, a thixotropic agent and a solvent, and heating and stirring at 30-70 ℃ for 0.5-1h to form a uniform and stable mixture, namely the prepared organic carrier;
(2) Preparation of glass paste
Adding a certain amount of glass powder into the organic carrier prepared in the step (1), fully stirring, and dispersing the glass powder until the fineness is less than 5 mu m by using a three-roller machine, wherein the slurry is pasty, namely the prepared glass slurry;
(3) Preparation of silver paste
And (3) taking the glass paste in the step (2), adding a certain amount of silver powder into the glass paste, fully mixing, dispersing the mixture to the fineness of less than 5 mu m by using a three-roller machine, obtaining fine line high-aspect ratio screen printing paste for the solar cell, and carrying out viscosity test at 270-320 Pa.s after standing for 24 hours.
The beneficial technical effects of the invention are as follows:
the conventional crystalline silicon solar positive silver has the problem that the viscosity, the shaping property and the net dropping property are not balanced, and when the viscosity of the sizing agent is high and the shaping property is good, the net dropping property of the sizing agent is poor, so that the conditions of virtual printing, calabash sections and the like are easy to occur; if the viscosity of the slurry is reduced, the net-falling property of the slurry is improved, and the problems of poor shaping property of the slurry, insufficient line height, increased line width, low short-circuit current of the battery piece, low conversion rate and the like are caused.
In the low-temperature curing (150 ℃) silver halide paste, a vinyl chloride-vinyl acetate resin is often added as a component for reducing the resistance and improving the curing effect, but no report has been made on the use of the vinyl chloride-vinyl acetate resin in the front silver paste of a crystalline silicon solar cell. The invention creatively adopts the vinyl chloride-vinyl acetate copolymer as an important component of the organic carrier, has high cohesiveness and shaping characteristics, can maintain line width, prevent lines from diffusing and collapsing, has good net falling property after being sheared, can recover better, can be matched with thixotropic agent and flatting agent for use, can ensure the shaping property of the paste and has a certain lubrication effect, can promote the net falling property of the paste, and can ensure the upper surface of the paste after printing to be flat. Compared with the prior art, the grid line after printing of the conductive paste has good shaping property, improves the aspect ratio of the sintered silver line, reduces the collapse of the sintered silver line, further reduces the occupied light receiving area and improves the conversion efficiency of the battery piece.
Drawings
FIG.1 is a printed line drawing of an embodiment;
Fig. 2 is a comparative example printed line.
Detailed Description
The present invention will be specifically described with reference to examples.
In this example, the curing agent was produced by Asahi chemical Co., ltd. And the leveling agent was produced by Pick, germany, and the vinyl chloride-vinyl acetate copolymer was produced by Pan Gao chemical Co., ltd. The organic carrier based on the vinyl chloride-vinyl acetate resin has high cohesiveness and shaping characteristics, can maintain line width, prevent lines from diffusing and collapsing, has good application performance in high-definition crystalline silicon solar positive silver paste, has good shaping and printing characteristics by using the vinyl chloride-vinyl acetate resin, and can realize high-definition printing.
The positive silver paste of the embodiment and the comparative example is printed on the passivation layer on the front side of the solar cell silicon wafer through a screen printing process to form a main grid and a fine grid, and the main grid and the fine grid are sintered in an infrared tunnel furnace after being dried, wherein the sintering peak temperature is 780 ℃, the time is 3s higher than 700 ℃, and the time is 7s higher than 600 ℃. The solvent in the slurry volatilizes in the drying stage, other organic matters are decomposed and burned out in the high-temperature section, glass powder and silver powder in the slurry are melted and hardened, a passivation layer is burned through, good ohmic contact is formed between the glass powder and the silver powder and the PN junction of the silicon wafer, and finally the solar cell is prepared and formed.
Example 1
The preparation method of the fine line high aspect ratio screen printing paste comprises the following steps:
(1) Preparation of organic Carriers
According to the weight portions, 3 portions of VMA vinyl chloride-acetate resin (vinyl acetate content of the vinyl chloride-acetate resin is 17, K value is 32-34, average molecular weight is 15000), 1.5 portions of SBN-70D curing agent, 20 portions of dibutyl phthalate, 5 portions of BYK-378 leveling agent, 0.5 portion of polyamide wax, 45 portions of 2 portions of Tween 80,2,2,4-trimethyl-1, 3-pentanediol monoisobutyrate and 23 portions of dimethyl adipate are mixed, heated and stirred for 30 minutes at 60 ℃ to prepare uniform and transparent solution, namely the organic carrier;
(2) Preparation of glass paste
Taking 1 part of glass powder with the D50 of 1.0 mu m and the Tg point of 300 ℃ according to parts by weight, uniformly dispersing 4.26 parts of the organic carrier prepared in the step (1) on a dispersing machine, and then, rolling on a three-roll machine until the fineness is below 5 mu m to prepare glass slurry;
(3) Preparation of silver paste
88 Parts of silver powder with the D50 of 1.8 mu m and the tap density of 5.7g/ml and 12 parts of glass paste prepared in the step (2) are taken according to parts by weight, uniformly dispersed on a dispersing machine, and then rolled on a three-roll machine until the fineness is below 5 mu m, so as to obtain fine line high-aspect ratio screen printing paste for the solar cell; the prepared silver paste was subjected to viscosity test at 297pa.s after being left for 24 hours, and the performance data of the final silver paste are shown in table 1.
Comparative example 1
The preparation method of the conductive paste using the conventional ethylcellulose resin comprises the following steps,
(1) Preparation of organic Carriers
According to the weight portions, 3 portions of ethyl cellulose N200,1.5 portions of SBN-70D curing agent, 20 portions of dibutyl phthalate, 5 portions of BYK-378 leveling agent, 0.5 portion of polyamide wax, 45 portions of Tween 80,2,2,4-trimethyl-1, 3-pentanediol monoisobutyrate and 23 portions of dimethyl adipate are mixed, heated and stirred for 30 minutes at 60 ℃ to prepare a uniform and transparent solution, namely an organic carrier;
(2) Preparation of glass paste
Taking 1 part of glass powder with the D50 of 1.0 mu m and the Tg point of 300 ℃ according to parts by weight, uniformly dispersing 4.26 parts of the organic carrier prepared in the step (1) on a dispersing machine, and then, rolling on a three-roll machine until the fineness is below 5 mu m to prepare glass slurry;
(3) Preparation of silver paste
88 Parts of silver powder with the D50 of 1.8 mu m and the tap density of 5.7g/ml and 12 parts of glass slurry prepared in the step (2) are taken according to parts by weight, and after being uniformly dispersed on a dispersing machine, the silver powder is rolled on a three-roller machine until the fineness is below 5 mu m; the prepared silver paste was subjected to viscosity test at 320pa.s after being left for 24 hours, and the performance data of the final silver paste are shown in table 1.
And (3) testing:
Carrying out rheological test on the silver paste prepared in the embodiment 1 and the comparative embodiment 1 on a rheometer (anton-paar/MCR 102, 25 ℃), carrying out conventional screen printing on a screen printer to prepare a solar cell, carrying out electrical property test on the prepared cell on an I/V tester, and observing the grid line condition of the cell under a laser microscope; meanwhile, the comparison of the existing commercial silver paste is given; the test data are shown in table 1.
TABLE 1 Performance data
From the above table data, it can be seen that the resin used in both example 1 and comparative example 1 is different, and the formulation of the present invention can improve the shaping property of the slurry, so that the slurry has more three-dimensional and full lines, specifically, the short-circuit current in example 1 is significantly higher than that in comparative example, and the open pressure of the slurry is also slightly higher, and the final conversion rate is significantly higher than that in comparative example. 3D scanning is carried out on the fine grid through a laser electron microscope, the lines of the embodiment are obviously plump, the line height is higher, the upper surface of the lines is flat, the line type is better, and the line type is shown in fig. 1 and a comparative fig. 2.
The conductive paste prepared by the invention has good net-laying property, excellent shaping property, good net-laying property, no broken wire, flat upper edge of lines and good line shape when printed on a conventional mesh screen printing plate with a size of 430-13-28 mu m. Good printing can be realized on the screen printing plate without the net knot of 400-16-22 mu m, no broken grid exists, the line type is good, but the comparative example can not pass through the net under the printing condition of the limit, the thin grid of the battery piece has serious virtual printing and the EL broken grid exists more.
Claims (5)
1. A preparation method of fine line high aspect ratio screen printing slurry comprises the following steps of mixing an organic carrier and glass powder to obtain glass slurry; adding silver powder into the glass paste to obtain fine-line high-aspect-ratio screen printing paste; the silver powder, the glass powder and the organic carrier are as follows: 85-91% of silver powder, 1.5-3.5% of glass powder and 7-11.5% of organic carrier; the organic carrier consists of the following raw materials in percentage by weight: 1 to 2 percent of curing agent, 18 to 22 percent of plasticizer, 2to 4 percent of vinyl chloride-vinyl acetate copolymer, 0.2 to 0.8 percent of thixotropic agent, 1 to 3 percent of dispersing agent, 4 to 5 percent of leveling agent and the balance of solvent; the curing agent is one or more of fatty amine curing agent, aromatic amine curing agent and amidoamine curing agent; the leveling agent is an organosilicon leveling agent and/or an acrylic ester leveling agent; the plasticizer is one or more of a polyol ester plasticizer, a phosphate ester plasticizer, a phthalate ester plasticizer and a fatty acid ester plasticizer; the thixotropic agent is one or more of hydrogenated castor oil, polyamide modified hydrogenated castor oil, polyamide wax slurry, polyethylene wax slurry, fumed silica and bentonite; the dispersing agent is a nonionic surfactant; the solvent is one or more of 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, diethylene glycol butyl ether acetate, dimethyl adipate, terpineol, kerosene, mixed dibasic acid ester DBE and isophorone.
2. The method for producing a fine line high aspect ratio screen printing paste according to claim 1, wherein the vinyl chloride-vinyl acetate copolymer is one or more of fat-soluble binary vinyl chloride-vinyl acetate copolymer, ternary carboxyl group-modified vinyl chloride-vinyl acetate copolymer, and ternary hydroxyl group-modified vinyl chloride-vinyl acetate copolymer.
3. The method for preparing fine line high aspect ratio screen printing paste according to claim 1, wherein the organic carrier is prepared by uniformly mixing a vinyl chloride-vinyl acetate copolymer, a curing agent, a plasticizer, a leveling agent, a dispersing agent, a thixotropic agent and a solvent, and stirring at 30-70 ℃ for 0.5-1 h.
4. The method of producing fine line high aspect ratio screen printing paste according to claim 1, wherein the viscosity of the fine line high aspect ratio screen printing paste is 270 to 320pa.s, and the fineness is less than 5 μm.
5. The method for producing fine line high aspect ratio screen printing paste according to claim 1, wherein said silver powder has a D50 particle diameter of 0.8 to 2.5 μm and a tap density of 5.0 to 6.7g/ml; the glass powder has a D50 particle size of 0.5-2.0 μm and a Tg of 200-550 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910321259.9A CN110246604B (en) | 2019-04-22 | Preparation method of fine line high aspect ratio screen printing slurry |
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| CN107240436A (en) * | 2017-06-30 | 2017-10-10 | 北京市合众创能光电技术有限公司 | A kind of PERC crystal silicon solar energy batteries positive silver paste and preparation method thereof |
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| CN106887270A (en) * | 2017-03-16 | 2017-06-23 | 无锡晶睿光电新材料有限公司 | A kind of depth-width ratio solar energy front side silver paste high and preparation method thereof |
| CN107240436A (en) * | 2017-06-30 | 2017-10-10 | 北京市合众创能光电技术有限公司 | A kind of PERC crystal silicon solar energy batteries positive silver paste and preparation method thereof |
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