CN114188069A - High-conductivity laser silver paste for touch screen and preparation method thereof - Google Patents
High-conductivity laser silver paste for touch screen 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 109
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 47
- 239000004332 silver Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 44
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000000498 ball milling Methods 0.000 claims abstract description 18
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 17
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 15
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 15
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000008117 stearic acid Substances 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 239000012948 isocyanate Substances 0.000 claims abstract description 9
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 9
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229920001225 polyester resin Polymers 0.000 claims abstract description 8
- 239000004645 polyester resin Substances 0.000 claims abstract description 8
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 9
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 claims description 4
- 229930003268 Vitamin C Natural products 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 claims description 4
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 235000019154 vitamin C Nutrition 0.000 claims description 4
- 239000011718 vitamin C Substances 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- VIZORQUEIQEFRT-UHFFFAOYSA-N Diethyl adipate Chemical compound CCOC(=O)CCCCC(=O)OCC VIZORQUEIQEFRT-UHFFFAOYSA-N 0.000 claims description 3
- XTDYIOOONNVFMA-UHFFFAOYSA-N dimethyl pentanedioate Chemical compound COC(=O)CCCC(=O)OC XTDYIOOONNVFMA-UHFFFAOYSA-N 0.000 claims description 3
- 239000002994 raw material Substances 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
- FPZWZCWUIYYYBU-UHFFFAOYSA-N 2-(2-ethoxyethoxy)ethyl acetate Chemical compound CCOCCOCCOC(C)=O FPZWZCWUIYYYBU-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000009736 wetting Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- 238000010329 laser etching Methods 0.000 abstract description 8
- 238000007639 printing Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 10
- 238000001035 drying Methods 0.000 description 6
- 238000000967 suction filtration Methods 0.000 description 6
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000010147 laser engraving Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052705 radium Inorganic materials 0.000 description 2
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- -1 Stearic acid Oleic acid Stearic acid Stearic acid Stearic acid Chemical compound 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000011973 solid acid Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Conductive Materials (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention provides high-conductivity laser silver paste for a touch screen and a preparation method thereof, and belongs to the technical field of laser conductive silver paste. The silver paste disclosed by the invention is prepared from polyester resin, an ester solvent, an isocyanate curing agent, a dispersing agent, a defoaming auxiliary agent and flaky silver powder. The silver powder is ball silver obtained by reducing silver nitrate by using stearic acid as a reducing dispersant and then is flaked by mechanical ball milling. The silver powder prepared by the invention is used in the touch screen silver paste, so that the conductivity of the paste is enhanced, and the cost of the silver paste is reduced; meanwhile, the silver powder has good dispersibility in the silver paste, the paste printing shows good flatness, and the laser etching yield is high.
Description
Technical Field
The invention belongs to the technical field of conductive silver paste, and particularly relates to high-conductivity laser silver paste for a touch screen and a preparation method thereof.
Background
As a latest computer input device, the touch screen is the simplest, convenient and natural man-machine interaction mode at present, gives a brand-new appearance to multimedia, and is a brand-new multimedia interaction device with great attraction. The method is mainly applied to inquiry of public information, leadership office, industrial control, military command, electronic games, song and dish ordering, multimedia teaching, real estate pre-sale and the like.
In recent years, touch screens are developing towards an increasing direction, and the Sensor fine line metal wire in the touch industry is mainly manufactured by conducting silver paste and then conducting a laser etching process. With the breakthrough of micron-sized laser processing technology in recent years, the line width and the line distance of a processing line of a metal area can be reduced from 0.3mm to 0.20mm to achieve the effect of an ultra-narrow frame, and the requirements of higher laser engraving yield and conductivity are provided for the conductive silver paste to be radiussed.
At present, the silver content of the common touch screen laser etching silver paste on the market reaches more than 70%, and in order to reach the high laser etching yield of the superfine circuit, spherical silver powder with high dispersibility and small particle size is generally selected, so that the conductivity of the silver paste is greatly influenced. With the rapid development of the electronic industry, the raw material cost of the conductive silver paste made of noble metals restricts the development of touch screen products to a certain extent, and the conductive silver paste of the touch screen with low cost and high conductivity is highly favored.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides laser conductive silver paste for a touch screen and a preparation method thereof. The silver powder prepared by the invention is used in the touch screen silver paste, so that the conductivity of the paste is enhanced, and the cost of the silver paste is reduced; meanwhile, the silver powder has good dispersibility in the silver paste, the paste printing shows good flatness, and the laser etching yield is high.
The technical scheme of the invention is as follows:
the high-conductivity laser conductive silver paste for the touch screen comprises the following raw materials in percentage by mass:
9-16% of polyester resin, 16-26% of ester solvent, 0.5-2% of isocyanate curing agent, 0.2-0.5% of dispersing agent, 0.1-0.5% of defoaming assistant and 55-65% of silver powder.
The ester solvent is at least one of dimethyl glutarate, diethyl adipate, diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate, cyclohexanone or dibutyl phthalate.
The polyester resin is specifically at least one of 2200B, 2700BLMW of Boss gum, BX-7000, BX-1001, 270, 240 of TOYOBO in Japan, and ES-320 or/and ES-100 of SK in Korea.
The isocyanate curing agent is at least one of Trixene BI 7982, Trixene BI 7986, Asahi-modified E402-B80T and Bayer N3390 of Baxinton.
The dispersant is a high molecular weight wetting dispersant for a solvent system; preferably at least one of BYK-2025, BYK-2008, BYK-270, BYK-2150, BYK-220S or DISPERBYK-110 from Bike, Germany.
The defoaming auxiliary agent is an oily non-silicon defoaming agent; preferably at least one of BYK-052, BYK-055, BYK-057, BYK-8800, BYK-8801 from Pyck, Germany and Silok-4084, Silok-4075 or Silok-4050 from Silok.
The silver powder is prepared by the following method: and (3) reducing silver nitrate by using stearic acid as a reducing dispersant to obtain spherical silver, and performing mechanical ball milling to obtain flaky silver powder.
The usage amount of the stearic acid dispersant is 2-4% of the mass of the silver nitrate.
The mechanical ball milling time is 6-12 h.
The particle size D50 of the silver powder is 0.8-1.8 μm after reduction, and the particle size D50 of the flake powder after ball milling is 2.0-4.5 μm.
The invention also provides a preparation method of the laser conductive silver paste for the touch screen, which comprises the following steps:
s1: preparation of silver powder
I. Preparing pure water to dissolve silver nitrate to obtain silver nitrate solution,
J. preparing pure water, heating to 50-70 ℃, dissolving different amounts of dispersant stearic acid at high temperature, adding ammonia water regulator to adjust the pH value of the solution to be alkaline to prepare dispersant solution,
K. preparing pure water to dissolve vitamin C at room temperature to obtain reducing agent solution, stirring for 10-50min,
l, simultaneously dripping the silver nitrate solution in the A and the dispersant solution in the B into the reducing agent solution C at the same speed,
m, after the solution in the step D is added, keeping the stirring paddle to stir for 10-50min continuously to ensure that the reaction solution and the reducing solution react fully to generate silver powder solution,
n, carrying out suction filtration, water washing and drying on the obtained silver powder,
o, the dried silver powder is prepared according to the following steps: water: adding stearic acid as dispersant into zirconium beads in the proportion of 1:1:10-1:1:1, mechanically ball-milling the mixture for different time to form silver flakes,
p, carrying out suction filtration, cleaning and drying treatment on the ball-milled silver flakes to obtain silver powder,
s2: mixing polyester resin and an ester solvent, heating and stirring at 70-80 ℃ for dissolving, standing and cooling to room temperature to obtain a resin base material, then sequentially adding an isocyanate curing agent, a dispersing agent and a defoaming auxiliary agent, and stirring and mixing to obtain an organic carrier;
s3: adding the silver powder prepared in the S1 into the organic carrier obtained in the S1, and uniformly mixing to obtain a mixed material;
s4: and dispersing the material obtained in the S3 by using a three-roll machine until the fineness is less than or equal to 5 mu m to obtain the conductive silver paste for the touch screen laser.
Preferably, the preparation method comprises the following steps:
s1: preparation of silver powder
A. 100g of silver nitrate was dissolved in 1kg of pure water at room temperature to prepare a silver nitrate solution.
B. 500g of pure water is prepared and heated to 60 ℃, different amounts of dispersant stearic acid are dissolved at high temperature, and then ammonia water regulator is added to adjust the pH value of the solution to 9, thus obtaining dispersant solution.
C. Preparing 500g of pure water, dissolving 40g of vitamin C at normal temperature, placing the solution in a constant temperature kettle of 40 ℃ to prepare a reducing agent solution, and keeping stirring at the constant temperature for 30 min.
D. And (3) simultaneously dropwise adding the silver nitrate solution in the step A and the dispersant solution in the step B into the reducing agent solution C at the same speed.
E. And D, after the solution is added in the step D, keeping the stirring paddle to stir for 30min continuously, and enabling the reaction solution and the reducing solution to react fully to generate the silver powder solution.
F. And carrying out suction filtration, washing and drying on the obtained silver powder.
G. The dried silver powder is prepared by the following steps: water: zirconium beads were added at a ratio of 1:1:10, and 2% stearic acid was added as a dispersant to perform mechanical ball milling for various periods of time to obtain silver flakes.
H. And carrying out suction filtration cleaning and drying treatment on the silver flakes subjected to ball milling.
S2: mixing polyester resin and an ester solvent, heating and stirring at 70-80 ℃ for dissolving, standing and cooling to room temperature to obtain a resin base material, then sequentially adding an isocyanate curing agent, a dispersing agent and a defoaming auxiliary agent, and stirring and mixing to obtain an organic carrier;
s3: adding the silver powder prepared in the S1 into the organic carrier obtained in the S1, and uniformly mixing to obtain a mixed material;
s4: and dispersing the material obtained in the S3 by using a three-roll machine until the fineness is less than or equal to 5 mu m to obtain the conductive silver paste for the touch screen laser.
The beneficial technical effects of the invention are as follows:
1. according to the invention, through controlling the surface dispersant of the reduced silver powder, the spherical silver with softer property and less agglomeration is prepared by using solid acid such as stearic acid and the like as the reduced dispersant, and then the spherical silver is ground into flaky silver powder by using a mechanical ball milling method, so that the prepared flaky silver also keeps the characteristics of softness and less agglomeration, and when the flaky silver powder is used for laser silver paste, the laser engraving property of the paste is ensured, and the conductivity of the paste can be greatly improved.
2. The silver powder prepared by the invention is used in the touch screen silver paste, so that the conductivity of the paste is enhanced, and the cost of the silver paste is reduced; meanwhile, the silver powder has good dispersibility in the silver paste, the paste printing shows good flatness, and the laser etching yield is high.
Detailed Description
The present invention will be described in detail with reference to examples.
The silver powder was prepared by adjusting the type of reducing dispersant, the amount of dispersant and the ball milling time according to the formulation parameters of table 1.
A. 100g of silver nitrate was dissolved in 1kg of pure water at room temperature to prepare a silver nitrate solution.
B. 500g of pure water is prepared and heated to 60 ℃, different amounts of dispersant stearic acid are dissolved at high temperature, and then ammonia water regulator is added to adjust the pH value of the solution to 9, thus obtaining dispersant solution.
C. Preparing 500g of pure water, dissolving 40g of vitamin C at normal temperature, placing the solution in a constant temperature kettle of 40 ℃ to prepare a reducing agent solution, and keeping stirring at the constant temperature for 30 min.
D. And (3) simultaneously dropwise adding the silver nitrate solution in the step A and the dispersant solution in the step B into the reducing agent solution C at the same speed.
E. And D, after the solution is added in the step D, keeping the stirring paddle to stir for 30min continuously, and enabling the reaction solution and the reducing solution to react fully to generate the silver powder solution.
F. And carrying out suction filtration, washing and drying on the obtained silver powder.
G. The dried silver powder is prepared by the following steps: water: zirconium beads were added with 2% dispersant at a ratio of 1:1:10 and mechanically ball milled into silver flakes at different times.
H. And carrying out suction filtration cleaning and drying treatment on the silver flakes subjected to ball milling.
Weighing 12% of 2200B resin, 13% of dimethyl glutarate and 13% of diethyl adipate according to the mass percentage, heating and stirring the mixture at the temperature of 80 ℃, standing and cooling the mixture to room temperature to obtain a resin base material, adding 1.25% of isocyanate curing agent, 0.5% of dispersant BYK-2025 and 0.25% of defoaming auxiliary agent Silok4084, and obtaining the organic carrier.
And adding a certain amount of the prepared silver powder into the prepared organic carrier, fully stirring all the materials, and dispersing the materials to the fineness of less than 5 microns by using a three-roll machine to obtain the conductive silver paste for touch screen laser.
TABLE 1 silver powder preparation related Process parameters
| Comparative example 1 | Comparative example 2 | Example 1 | Example 2 | Example 3 | |
| Reducing the dispersant species | Stearic acid | Oleic acid | Stearic acid | Stearic acid | Stearic acid |
| Reducing the amount of dispersant | 2％ | 2％ | 2％ | 4％ | 2％ |
| Ball milling time/h | 0 | 10 | 10 | 10 | 6 |
The dispersant for the reduced silver powders used in examples 1, 2, 3 and comparative example 1 was stearic acid, except that the silver powders used in examples 1, 2 and 3 were mechanically ball-milled into flakes, and the direct-reduced spherical silver powder used in comparative example 1.
Comparative example 2 is different from example 1 in that a dispersant for the reduced silver powder was used, and the amount of the dispersant and subsequent mechanical ball milling were exactly the same.
Example 1, example 2 compared with example 3 differed in the amount of reduced dispersant and the ball milling time.
Performance testing
The pastes prepared in examples 1-3 and comparative examples 1 and 2 were respectively printed on an ITO conductive film by screen printing, and dried at 130-140 deg.C for 30 min. And (3) performing laser on the baked silver paste by using a laser process, and performing performance test, wherein the test results are shown in table 1.
TABLE 1 table of results of performance tests of examples 1-3 and comparative example 1
As can be seen from the above table, in examples 1 to 3, comparative example 2, and comparative example 1, the resistivity of the paste prepared from the silver powder flaked was also significantly reduced at a relatively low silver content, and the conductivity of the silver powder flaked was strong. Compared with the comparative examples 1-3 and 1 and 2, the silver powder reduced by using stearic acid as a dispersing agent is softer, the agglomeration property is less, and the laser etching yield is obviously improved.
Compared with examples 1, 2 and 3, the difference between the dispersing agent amount and the ball milling time mainly affects the particle size and the conductivity of the silver powder and the radium carving yield, the more the dispersing agent is, the smaller the particle size of the silver powder is, the poorer the conductivity is, but the higher the radium carving yield is, the better the dispersibility is; and the longer the ball milling time is, the resistance can be increased, but the particle size of the silver powder becomes smaller, the dispersibility becomes better, and the laser etching yield is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The high-conductivity laser silver paste for the touch screen is characterized by being prepared from the following raw materials in percentage by mass: 9-16% of polyester resin, 16-26% of ester solvent, 0.5-2% of isocyanate curing agent, 0.2-0.5% of dispersing agent, 0.1-0.5% of defoaming assistant and 55-65% of flake silver powder, wherein the flake silver powder is prepared by the following method: and (3) reducing silver nitrate by using stearic acid as a reducing dispersant to obtain spherical silver, and performing mechanical ball milling to form a sheet.
2. The high-conductivity laser silver paste for the touch screen according to claim 1, wherein the amount of stearic acid is 2-4% of the amount of silver nitrate.
3. The high-conductivity laser silver paste for the touch screen, according to claim 1, wherein the mechanical ball milling time is 6-12 hours.
4. The high-conductivity laser silver paste for the touch screen according to claim 1, wherein the ester solvent is at least one of dimethyl glutarate, diethyl adipate, diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate, cyclohexanone and dibutyl phthalate.
5. The high-conductivity laser silver paste for the touch screen according to claim 1, wherein the polyester resin is at least one of the following types: boss gum 2200B, Boss gum 2700BLMW, TOYOBO BX-7000, TOYOBO BX-1001, TOYOBO 270, TOYOBO 240, Korean SK ES-320, and Korean SKES-100.
6. The high conductivity laser silver paste for touch screen according to claim 1, wherein the isocyanate curing agent is at least one of Trixene BI 7982, Trixene BI 7986, Asahi chemical E402-B80T and Bayer N3390.
7. The high-conductivity laser silver paste for the touch screen according to claim 1, wherein the dispersant is a solvent-based system high molecular weight wetting dispersant; preferably at least one of BYK-2025, BYK-2008, BYK-270, BYK-2150, BYK-220S and DISPERBYK-110 from Bick, Germany.
8. The high-conductivity laser silver paste for the touch screen according to claim 1, wherein the defoaming auxiliary agent is an oily non-silicon type defoaming agent; preferably at least one of BYK-052, BYK-055, BYK-057, BYK-8800, BYK-8801 from Pyck, Germany and Silok-4075, Silok-4050 from Silok.
9. The high-conductivity laser silver paste for the touch screen as recited in claim 1, wherein the spherical silver powder has a particle size D50 of 0.8-1.8 μm, and the ball-milled flake powder has a particle size D50 of 2.0-4.5 μm.
10. The method for preparing the high-conductivity laser silver paste for the touch screen according to claim 1 is characterized by comprising the following steps:
s1: preparation of silver powder
A. Preparing pure water to dissolve silver nitrate to obtain silver nitrate solution,
B. preparing pure water, heating to 50-70 ℃, dissolving different amounts of dispersant stearic acid at high temperature, adding ammonia water regulator to adjust the pH value of the solution to be alkaline to prepare dispersant solution,
C. preparing pure water to dissolve vitamin C at room temperature to obtain reducing agent solution, stirring for 10-50min,
D. dripping the silver nitrate solution in the A and the dispersant solution in the B into the reducing agent solution C at the same speed,
E. d, after the solution is added in the step D, keeping the stirring paddle to stir for 10-50min continuously to ensure that the reaction solution and the reducing solution react fully to generate silver powder solution,
F. the obtained silver powder is filtered, washed and dried,
G. the dried silver powder is prepared by the following steps: water: adding stearic acid as dispersant into zirconium beads in the proportion of 1:1:10-1:1:1, mechanically ball-milling the mixture for different time to form silver flakes,
H. the silver flakes which are ball-milled are filtered, cleaned and dried to obtain silver powder,
s2: mixing polyester resin and an ester solvent, heating and stirring at 70-80 ℃ for dissolving, standing and cooling to room temperature to obtain a resin base material, then sequentially adding an isocyanate curing agent, a dispersing agent and a defoaming auxiliary agent, and stirring and mixing to obtain an organic carrier;
s3: adding the silver powder prepared in the S1 into the organic carrier obtained in the S1, and uniformly mixing to obtain a mixed material;
s4: and dispersing the material obtained in the S3 by using a three-roll machine until the fineness is less than or equal to 5 mu m to obtain the conductive silver paste for the touch screen laser.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116511520A (en) * | 2023-04-23 | 2023-08-01 | 东方电气集团科学技术研究院有限公司 | Mixed silver powder with large and small particle sizes, preparation method thereof and conductive silver paste |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105414560A (en) * | 2015-12-25 | 2016-03-23 | 广东羚光新材料股份有限公司 | Method for preparing small-grain-size flake silver powder for high-resolution display screen paste |
| CN105772743A (en) * | 2016-05-13 | 2016-07-20 | 江苏理工学院 | Preparing method for flake silver powder applied to touch screen |
| CN108907226A (en) * | 2018-07-13 | 2018-11-30 | 金川集团股份有限公司 | A kind of preparation method for laser ablation electrode circuit super fine silver powder |
| CN110586959A (en) * | 2019-10-28 | 2019-12-20 | 苏州银瑞光电材料科技有限公司 | Preparation method of flake silver powder with high tap density |
| CN112420238A (en) * | 2020-11-09 | 2021-02-26 | 无锡晶睿光电新材料有限公司 | Laser conductive silver paste for touch screen and preparation method thereof |
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2021
- 2021-11-30 CN CN202111438556.5A patent/CN114188069A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105414560A (en) * | 2015-12-25 | 2016-03-23 | 广东羚光新材料股份有限公司 | Method for preparing small-grain-size flake silver powder for high-resolution display screen paste |
| CN105772743A (en) * | 2016-05-13 | 2016-07-20 | 江苏理工学院 | Preparing method for flake silver powder applied to touch screen |
| CN108907226A (en) * | 2018-07-13 | 2018-11-30 | 金川集团股份有限公司 | A kind of preparation method for laser ablation electrode circuit super fine silver powder |
| CN110586959A (en) * | 2019-10-28 | 2019-12-20 | 苏州银瑞光电材料科技有限公司 | Preparation method of flake silver powder with high tap density |
| CN112420238A (en) * | 2020-11-09 | 2021-02-26 | 无锡晶睿光电新材料有限公司 | Laser conductive silver paste for touch screen and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116511520A (en) * | 2023-04-23 | 2023-08-01 | 东方电气集团科学技术研究院有限公司 | Mixed silver powder with large and small particle sizes, preparation method thereof and conductive silver paste |
| CN116511520B (en) * | 2023-04-23 | 2024-03-15 | 东方电气集团科学技术研究院有限公司 | Mixed silver powder with large and small particle sizes, preparation method thereof and conductive silver paste |
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