CN115116648A - Conductive silver paste for membrane switch and preparation method thereof - Google Patents
Conductive silver paste for membrane switch and preparation method thereof Download PDFInfo
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- CN115116648A CN115116648A CN202210780747.8A CN202210780747A CN115116648A CN 115116648 A CN115116648 A CN 115116648A CN 202210780747 A CN202210780747 A CN 202210780747A CN 115116648 A CN115116648 A CN 115116648A
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- conductive silver
- membrane switch
- boron oxide
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 180
- 239000012528 membrane Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 229910052810 boron oxide Inorganic materials 0.000 claims abstract description 50
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 14
- 239000002952 polymeric resin Substances 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 18
- VIZORQUEIQEFRT-UHFFFAOYSA-N Diethyl adipate Chemical compound CCOC(=O)CCCCC(=O)OCC VIZORQUEIQEFRT-UHFFFAOYSA-N 0.000 claims description 14
- 239000012948 isocyanate Substances 0.000 claims description 14
- 150000002513 isocyanates Chemical class 0.000 claims description 14
- 229920005749 polyurethane resin Polymers 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 9
- HJOVHMDZYOCNQW-UHFFFAOYSA-N isophorone Chemical compound CC1=CC(=O)CC(C)(C)C1 HJOVHMDZYOCNQW-UHFFFAOYSA-N 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000002518 antifoaming agent Substances 0.000 claims description 3
- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 claims description 3
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 3
- QYMFNZIUDRQRSA-UHFFFAOYSA-N dimethyl butanedioate;dimethyl hexanedioate;dimethyl pentanedioate Chemical compound COC(=O)CCC(=O)OC.COC(=O)CCCC(=O)OC.COC(=O)CCCCC(=O)OC QYMFNZIUDRQRSA-UHFFFAOYSA-N 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000002562 thickening agent Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 abstract description 77
- 239000004332 silver Substances 0.000 abstract description 77
- 238000001035 drying Methods 0.000 abstract description 16
- 239000010409 thin film Substances 0.000 abstract 2
- 230000000052 comparative effect Effects 0.000 description 21
- -1 polysiloxane Polymers 0.000 description 11
- 229920001296 polysiloxane Polymers 0.000 description 11
- 230000001070 adhesive effect Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 7
- 238000007650 screen-printing Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 229910021419 crystalline silicon Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- YCKOAAUKSGOOJH-UHFFFAOYSA-N copper silver Chemical compound [Cu].[Ag].[Ag] YCKOAAUKSGOOJH-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding 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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Switches (AREA)
- Paints Or Removers (AREA)
- Conductive Materials (AREA)
Abstract
The application relates to the technical field of conductive silver paste, in particular to conductive silver paste for a thin film switch and a preparation method thereof, and the conductive silver paste for the thin film switch comprises the following components in parts by weight: 55-75 parts of silver powder, 2-12 parts of boron oxide, 1-3 parts of a curing agent, 20-30 parts of a solvent, 1-3 parts of an auxiliary agent and 6-12 parts of a polymer resin; the preparation method comprises the following steps: accurately weighing the components, and mixing and stirring the components in sequence to obtain the conductive silver paste for the membrane switch. The conductive silver paste for the membrane switch can greatly shorten the drying time of the silver paste, and has good conductivity, so that the application scene of the conductive silver paste for the membrane switch is improved.
Description
Technical Field
The application relates to the technical field of conductive silver paste, in particular to silver-coated copper silver paste and a preparation method thereof.
Background
With the rapid development of the electronic industry, membrane switches are widely applied to electronic products, and membrane switches are also called soft-touch keyboards, adopt an integral sealing structure formed by combining a plurality of layers of planes, are novel electronic components integrating light collection, machines and electricity by sealing a key switch, a panel, a mark, a symbol display and a lining plate together, are fundamental changes of the appearance structure of the electronic products, can replace keys of conventional discrete components, and can more reliably execute the task of an operating system. The membrane switch has the advantages of good water resistance, dust resistance, oil resistance, harmful gas erosion resistance, stable and reliable performance, light weight, small volume, long service life, convenient assembly and connection, washable panel without damaging characters, rich colors, elegant appearance and the like. The main type of membrane switch is a membrane switch panel which is an electronic component that is composed of rigid or flexible printed circuit board as base body, hand-feeling or no-hand-feeling keys installed on it, and plastic (polycarbonate PC, polyester PET, etc.) membrane panel printed with colorful decorative patterns, and integrates the switch function and decorative function into one body, and is a new type of man-machine interface. The connection mode of the switch circuit and the whole machine can be completed by welding or splicing.
As one of important materials for manufacturing the membrane switch, the conductive silver paste has an increasingly high requirement on the performance of the membrane switch, and the requirement on the conductive silver paste is also gradually increased. In the actual production film switch, in order to save the construction time and improve the manufacturing rate, the printed silver paste can be dried quickly to provide the manufacturing rate.
The existing method for improving the drying of the silver paste is to add an organic solvent and high molecular resin into the silver paste to achieve the effect of quick drying of the silver paste, but the conductivity of the silver paste prepared by the method is reduced, and the application of the conductive silver paste is limited to a certain extent.
Disclosure of Invention
In order to improve the drying effect and the conductivity of the conductive silver paste, the application provides the conductive silver paste for the membrane switch and the preparation method thereof.
The application provides a conductive silver paste for a membrane switch and a preparation method thereof, which adopt the following technical scheme:
in a first aspect, the present application provides a conductive silver paste for a membrane switch, comprising the following components in parts by weight: 55-75 parts of silver powder, 2-12 parts of boron oxide, 1-3 parts of a curing agent, 20-30 parts of a solvent, 1-3 parts of an auxiliary agent and 6-12 parts of a polymer resin.
According to the silver paste, the micron silver powder with the larger particle size is mixed, the contact area between the adjacent micron silver powders is larger, the transmission of electric signals is facilitated, the resistance is smaller after the film is formed, the excellent conductivity is realized, the boron oxide can play a good role in conducting and transmitting among the micron silver powders, and the conductivity of the silver paste is further improved; the solvent can enable the micron silver powder and the boron oxide to be dispersed in the polymer resin more uniformly, so that the conductivity of the silver paste is improved; the auxiliary agent can enable the whole silver paste to be easier to construct and enable the silver paste to be easier to attach to a base material; the high molecular resin can enable the components to be better connected, so that a silver paste system is more stable, and meanwhile, the silver paste and the solar crystalline silicon cell can be more tightly connected by utilizing the adhesive property of the silver paste; the curing agent can enable the high-molecular resin to be cured quickly, the drying time of the silver paste can be shortened, and the efficiency of silver paste screen printing is improved. The conductive silver paste for the membrane switch can greatly shorten the drying time of the silver paste, and has good conductivity, so that the application scene of the conductive silver paste for the membrane switch is improved.
Preferably, the silver powder is flake silver powder, and the average particle size of the flake silver powder is 5-10 μm.
Preferably, the average particle size of the boron oxide is 50 to 100 nm.
Through controlling the particle size of the boron oxide, the boron oxide and the silver powder can be better matched, and the conductivity of the silver paste is further improved.
Preferably, the weight ratio of the boron oxide to the silver powder is 1: 10.
by controlling the weight ratio of the boron oxide to the silver powder, the boron oxide is easier to fill between adjacent silver powder particles, and the overall conductivity of the silver paste is further improved.
Preferably, the curing agent is one of isocyanate, imidazole and dicyandiamide.
Preferably, the solvent is one of isophorone, diethyl adipate and dibasic ester.
Preferably, the auxiliary agent is one or a mixture of a defoaming agent, a leveling agent and a thickening agent.
Preferably, the polymer resin is a polyurethane resin or a vinyl chloride-vinyl acetate resin.
In a second aspect of the present invention, the present application provides a method for preparing a conductive silver paste for a membrane switch, comprising the following steps:
s1, weighing the polymer resin and the solvent according to the corresponding weight parts, and mixing and stirring the polymer resin and the solvent uniformly to obtain a carrier;
s2, weighing the silver powder, the boron oxide, the curing agent and the auxiliary agent, adding the silver powder, the boron oxide, the curing agent and the auxiliary agent into the carrier obtained in the step S1, and continuously stirring and dispersing to obtain slurry;
and S3, grinding the slurry obtained in the step S2 to obtain the conductive silver slurry for the membrane switch.
The application has the following beneficial technical effects:
the silver paste is mixed with the micron silver powder with the larger particle size and the boron oxide with the smaller particle size, the contact area between the adjacent micron silver powders is larger, the transmission of electric signals is facilitated, the resistance is smaller after film forming, the excellent conductive performance is realized, meanwhile, the boron oxide with the smaller particle size and the micron silver powder can play a good conductive transmission role through a certain weight ratio, and the conductivity of the silver paste is further improved; the solvent can enable the micron silver powder and the boron oxide to be dispersed in the polymer resin more uniformly, so that the conductivity of the silver paste is improved; the auxiliary agent can enable the whole silver paste to be easier to construct and enable the silver paste to be easier to attach to a base material; the high molecular resin can enable the components to be better connected, so that a silver paste system is more stable, and meanwhile, the silver paste and the solar crystalline silicon cell can be more tightly connected by utilizing the adhesive property of the silver paste; the curing agent can enable the high-molecular resin to be cured quickly, the drying time of the silver paste can be shortened, and the efficiency of silver paste screen printing is improved. The conductive silver paste for the membrane switch can greatly shorten the drying time of the silver paste, and has good conductivity, so that the application scene of the conductive silver paste for the membrane switch is improved.
Detailed Description
The existing conductive silver paste for the membrane switch is usually prepared by adding an organic solvent and high molecular resin into the silver paste to achieve the effect of quickly drying the silver paste, but the silver paste prepared by the method can reduce the conductivity of the silver paste, and the application of the conductive silver paste is limited to a certain extent. The inventor finds that the conductive performance of the silver paste can be improved by adding boron oxide into the silver paste and adjusting the parameters of the boron oxide, and the drying time is shorter.
The present application is further illustrated below with reference to examples.
The average grain diameter of the silver powder is 5-10 mu m; the silver powder has a specific surface area of 1.0-2.2m 2 The purity of the silver powder is more than 99.95 percent. The area of contact between the adjacent silver particle of great micron silver powder is bigger in this application silver-clad copper silver thick liquid, is favorable to the transmission of signal of telecommunication, and the resistance is less after the film-forming, has excellent electric conductive property.
The average particle diameter of the boron oxide is 50 to 100 nm. Through controlling the particle size of the boron oxide, the boron oxide and the silver powder can be better matched, and the conductivity of the silver paste is further improved.
The curing agent is one of isocyanate, imidazole and dicyandiamide, and specifically, the curing agent is selected from isocyanate in the application. The curing agent can enable the high-molecular resin to be cured quickly, the drying time of the silver paste can be shortened, and the efficiency of silver paste screen printing is improved.
The solvent is one of isophorone, diethyl adipate and dibasic ester. In particular, the solvent is selected herein to be diethyl adipate. The solvent can enable the micron silver powder and the boron oxide to be dispersed more uniformly in the polymer resin, and the conductivity of the silver paste is improved.
The auxiliary agent is one or a mixture of a defoaming agent, a flatting agent and a thickening agent. Specifically, the auxiliary agent is selected as a leveling agent, and the leveling agent is a polysiloxane leveling agent. The auxiliary agent can enable the whole silver paste to be easier to construct, so that the silver paste is easier to attach to the base material.
The high molecular resin is polyurethane resin or vinyl chloride-vinyl acetate resin. Specifically, the polymer resin is specifically selected from polyurethane resins in the present application. The high polymer resin can enable the components to be better connected, so that a silver paste system is more stable, and meanwhile, the silver paste and the solar crystalline silicon battery can be more tightly connected by utilizing the adhesion of the silver paste.
Example 1
The conductive silver paste for the membrane switch comprises the following components in parts by weight: 55 parts of silver powder, 2 parts of boron oxide, 1 part of isocyanate, 20 parts of diethyl adipate, 1 part of polysiloxane flatting agent and 6 parts of polyurethane resin.
Taking embodiment 1 as an example, a method for preparing conductive silver paste for a membrane switch includes the following steps:
s1, weighing polyurethane resin and diethyl adipate according to corresponding weight parts, and mixing and stirring the polyurethane resin and the diethyl adipate uniformly to obtain a carrier;
s2, weighing silver powder, boron oxide, isocyanate and a polysiloxane flatting agent, adding the silver powder, the boron oxide, the isocyanate and the polysiloxane flatting agent into the carrier obtained in the step S1, and continuously stirring and dispersing to obtain slurry;
and S3, grinding the slurry obtained in the step S2 to obtain the conductive silver slurry for the membrane switch.
Example 2
The conductive silver paste for the membrane switch comprises the following components in parts by weight: 60 parts of silver powder, 6 parts of boron oxide, 2 parts of isocyanate, 25 parts of diethyl adipate, 2 parts of polysiloxane flatting agent and 9 parts of polyurethane resin. The conductive silver paste for the membrane switch of example 2 is prepared in the same manner as in example 1.
Example 3
The conductive silver paste for the membrane switch comprises the following components in parts by weight: 75 parts of silver powder, 12 parts of boron oxide, 3 parts of isocyanate, 30 parts of diethyl adipate, 3 parts of polysiloxane flatting agent and 12 parts of polyurethane resin. The conductive silver paste for a membrane switch of example 3 is prepared in the same manner as in example 1.
Example 4
The conductive silver paste for the membrane switch comprises the following components in parts by weight: 60 parts of silver powder, 3 parts of boron oxide, 2 parts of isocyanate, 25 parts of diethyl adipate, 2 parts of polysiloxane flatting agent and 9 parts of polyurethane resin. When the weight ratio of boron oxide to silver powder is 0.5:10, the conductive silver paste for a membrane switch of example 4 is prepared in the same manner as in example 1.
Example 5
The conductive silver paste for the membrane switch comprises the following components in parts by weight: 60 parts of silver powder, 12 parts of boron oxide, 2 parts of isocyanate, 25 parts of diethyl adipate, 2 parts of polysiloxane flatting agent and 9 parts of polyurethane resin. When the weight ratio of boron oxide to silver powder is 2:10, the conductive silver paste for a membrane switch of example 5 is prepared in the same manner as in example 1.
Comparative example 1
The conductive silver paste for the membrane switch comprises the following components in parts by weight: 60 parts of silver powder, 2 parts of isocyanate, 25 parts of diethyl adipate, 2 parts of polysiloxane flatting agent and 9 parts of polyurethane resin. The conductive silver paste for membrane switch of comparative example 1 was prepared in the same manner as in example 1. Comparative example 1 differs from example 2 in that no boron oxide is added.
Comparative example 2
The conductive silver paste for the membrane switch comprises the following components in parts by weight: 60 parts of silver powder, 6 parts of boron oxide, 2 parts of isocyanate, 25 parts of diethyl adipate, 2 parts of polysiloxane flatting agent and 9 parts of polyurethane resin. The conductive silver paste for membrane switch of comparative example 2 was prepared in the same manner as in example 1. Comparative example 2 is different from example 2 in that the boron oxide in comparative example 2 has an average particle diameter of 20 to 40 nm.
Comparative example 3
The conductive silver paste for the membrane switch comprises the following components in parts by weight: 60 parts of silver powder, 6 parts of boron oxide, 2 parts of isocyanate, 25 parts of diethyl adipate, 2 parts of polysiloxane flatting agent and 9 parts of polyurethane resin. The conductive silver paste for membrane switch of comparative example 3 was prepared in the same manner as in example 1. Comparative example 3 is different from example 2 in that the boron oxide in comparative example 2 has an average particle diameter of 120 to 150 nm.
Performance detection
The conductive silver paste for the membrane switch in the embodiments 1 to 3 was applied to the flexible film prepared by coating the circuit board with the screen printing process, and the physical properties of the flexible film were tested, wherein the curing conditions for applying the silver paste to the circuit board were that the circuit board coated with the silver paste was placed in a forced air oven, dried at 100 ℃, and the time required for drying was recorded. The viscosity was measured using a rotational viscometer. The resistivity was tested using a multimeter. The adhesive force change rate is measured by adopting 3M isolation glue to bond the silver paste film, and the smaller the adhesive force change rate is, the better the adhesive property between the silver paste film and the circuit board substrate is. The hardness of the silver paste film is tested and classified by using the hardness grade of a Chinese pencil. The yield is that after the silver paste is coated on the circuit board, the number of the circuit boards which can be normally used by the membrane switch is divided by the total number of the circuit boards of the membrane switch. The test results of examples 1-3 are shown in Table 1.
TABLE 1 results of testing the properties of examples 1-3
As can be seen by combining examples 1 to 3 and table 1, the curing conditions, viscosity, hardness and yield of the conductive silver paste for a membrane switch of examples 1 to 3 are not greatly different, the resistivity of example 2 is lower, and the adhesion change rate is also lower, which indicates that example 2 has better conductivity and adhesion.
The conductive silver paste for the membrane switch in example 4 and example 5 was applied to the flexible film prepared by the screen printing process on the circuit board to perform the physical property test, and the test results are shown in table 2.
Table 2 results of performance tests of example 2 and examples 4 to 5
As can be seen from the combination of example 2 and examples 4-5 and from table 2, the curing time of the conductive silver paste for the membrane switch in example 2 is shorter than that in examples 4 and 5, which indicates that the drying time of the silver paste can be reduced by adjusting the weight ratio of the boron oxide to the silver powder, thereby improving the construction efficiency of silver paste coating. The resistivity of example 2 is much lower than that of examples 4 and 5, which shows that the resistivity of the silver paste can be reduced by adjusting the weight ratio of boron oxide to silver powder, so that the conductivity of the silver paste is improved. The adhesive force change rate of the embodiment 2 is also smaller than that of the embodiments 4 and 5, which shows that the adhesive property of the silver paste can be improved by adjusting the weight ratio of the boron oxide to the silver powder, so that the silver paste is not easy to fall off after being coated on a circuit board, and the service time is longer. The viscosity, hardness and yield of examples 2 and 4-5 did not change significantly, indicating that both examples 2 and 4-5 exhibited better performance in this regard. This application can make the silver thick liquid can enough reach quick mummification's effect through the weight ratio of adjusting boron oxide and silver powder, still has good electric conductive property simultaneously to the range of application of the electrically conductive silver thick liquid that is used for membrane switch has further been enlarged.
The conductive silver paste for the membrane switch in comparative examples 1 to 3 was coated on a circuit board by a screen printing process to prepare a flexible film, and the test results are shown in table 3.
TABLE 3 results of testing the properties of comparative examples 1-3
By combining the example 2 and the comparative example 1 and combining the table 3, it can be seen that the curing time of the example 2 is far shorter than that of the comparative example 1, which shows that the drying time of the silver paste can be effectively reduced after the boron oxide is added in the silver paste, and the construction efficiency is greatly improved. The resistivity of example 2 is also much lower than that of comparative example 1, which shows that the conductivity of the silver paste can be improved by adding boron oxide into the silver paste. The adhesive force change rate of the silver paste in the embodiment 2 is lower than that of the silver paste in the comparative example 1, which shows that the addition of boron oxide in the silver paste can improve the adhesive property of the silver paste, so that the silver paste is not easy to fall off after being coated on a circuit board, and the service time is longer.
Combining example 2 and comparative examples 2-3 and table 3, it can be seen that the curing time of example 2 is much shorter than that of comparative examples 2 and 3, which shows that the drying time of the silver paste can be effectively reduced by changing the particle size of the boron oxide, and the construction efficiency can be greatly improved. The resistivity of example 2 is also much lower than that of comparative examples 2 and 3, which shows that the conductivity of the silver paste can be improved by changing the particle size of the boron oxide. The adhesion change rate of example 2 is lower than that of comparative examples 2 and 3, which shows that the adhesion of the silver paste can be improved by changing the particle size of boron oxide.
The conductive silver paste for the membrane switch can greatly shorten the drying time of the silver paste, and has good conductivity, so that the application scene of the conductive silver paste for the membrane switch is improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The conductive silver paste for the membrane switch is characterized by comprising the following components in parts by weight: 55-75 parts of silver powder, 2-12 parts of boron oxide, 1-3 parts of a curing agent, 20-30 parts of a solvent, 1-3 parts of an auxiliary agent and 6-12 parts of a polymer resin.
2. The conductive silver paste for membrane switches according to claim 1, wherein the silver powder is flake silver powder, and the average particle size of the flake silver powder is 5-10 μm.
3. The conductive silver paste for a membrane switch according to claim 1 or 2, wherein the average particle size of the boron oxide is 50-100 nm.
4. The conductive silver paste for membrane switches according to claim 3, wherein the weight ratio of boron oxide to silver powder is 1: 10.
5. the conductive silver paste for membrane switches according to claim 1 or 2, wherein the curing agent is one of isocyanate, imidazole, and dicyandiamide.
6. The conductive silver paste for membrane switches according to claim 1 or 2, wherein the solvent is one of isophorone, diethyl adipate, and dibasic ester.
7. The conductive silver paste for the membrane switch according to claim 1, wherein the auxiliary agent is one or more of a defoaming agent, a leveling agent and a thickening agent.
8. The conductive silver paste for membrane switches according to claim 1, wherein said polymeric resin is a polyurethane resin or a vinyl chloride-vinyl acetate resin.
9. The method for preparing the conductive silver paste for the membrane switch according to any one of claims 1 to 8, wherein the method comprises the following steps:
s1, weighing the polymer resin and the solvent according to the corresponding parts by weight, and mixing and stirring the polymer resin and the solvent uniformly to obtain a carrier;
s2, weighing silver powder, boron oxide, a curing agent and an auxiliary agent, adding the silver powder, the boron oxide, the curing agent and the auxiliary agent into the carrier obtained in the step S1, and continuously stirring and dispersing to obtain slurry;
and S3, grinding the slurry obtained in the step S2 to obtain the conductive silver slurry for the membrane switch.
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| CN202210780747.8A CN115116648B (en) | 2022-07-04 | 2022-07-04 | Conductive silver paste for thin film switch and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103854719A (en) * | 2012-12-03 | 2014-06-11 | 西北稀有金属材料研究院 | Solar cell back electrode slurry material and preparation method thereof |
| CN105409009A (en) * | 2013-07-25 | 2016-03-16 | 纳美仕有限公司 | Electroconductive paste and method for producing crystalline silicon solar battery |
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| CN103854719A (en) * | 2012-12-03 | 2014-06-11 | 西北稀有金属材料研究院 | Solar cell back electrode slurry material and preparation method thereof |
| CN105409009A (en) * | 2013-07-25 | 2016-03-16 | 纳美仕有限公司 | Electroconductive paste and method for producing crystalline silicon solar battery |
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