CN110769678B - Electromagnetic shielding silver paste applied to 5G personal communication equipment and preparation method thereof - Google Patents
Electromagnetic shielding silver paste applied to 5G personal communication equipment and preparation method thereof Download PDFInfo
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- CN110769678B CN110769678B CN201911095489.4A CN201911095489A CN110769678B CN 110769678 B CN110769678 B CN 110769678B CN 201911095489 A CN201911095489 A CN 201911095489A CN 110769678 B CN110769678 B CN 110769678B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
Abstract
The invention discloses an electromagnetic shielding silver paste applied to 5G personal communication equipment, which comprises 3-10 wt% of high-adhesion resin, 15-30 wt% of solvent, 0.5-5 wt% of adhesion promoter, 0.3-5 wt% of curing catalyst and 15-80 wt% of flaky silver powder by taking the total mass of the electromagnetic shielding silver paste as a reference. The electromagnetic shielding silver paste disclosed by the invention is low in resistivity, good in conductivity and good in electromagnetic shielding efficiency, the complete drying temperature can be as low as 80 ℃, and the deformation and damage of a conductive area base material and a fireproof PC base material of personal communication equipment at high temperature are greatly reduced. The corrosion resistance is enhanced, the resistivity can be kept stable for a long time in the environments of temperature alternation, water vapor, salt mist and the like, the adaptability of the base material is good, and the adhesive force with the base material of a conductive area of the personal communication equipment is good, so that the stable electromagnetic shielding effect is ensured.
Description
Technical Field
The invention relates to the technical field, in particular to electromagnetic shielding silver paste applied to 5G personal communication equipment and a preparation method thereof.
Background
6.6.2019, the 5G commercial license plate is officially issued in China, and the sign that China officially enters the 5G commercial original year is marked. The Chinese information communication research institute expresses in the 5G industry economic contribution, and the direct economic output of the 5G business in China is estimated to reach 10.6 trillion yuan in 2020 to 2025 years, so that more than 300 million employment posts are directly created.
The 5G mobile phone is a smart phone using a fifth generation communication system. In the next half year of 2019, the mainstream mobile phone manufacturers in China will release 5G commercial mobile phones of the users in succession. With the development of personal communication devices such as 5G mobile phones and the like and the demand of high-frequency and high-speed communication, the problem of electromagnetic interference of high-frequency parts is getting more and more serious.
In personal communication equipment such as mobile phones and the like, a conductive coating is mainly formed on a middle frame in a spraying, transfer printing and pad printing mode. The high-frequency electromagnetic shielding is mainly determined by absorption loss:
A≈0.131t√fμrσr(dB)
wherein A is the absorption loss in electromagnetic shielding in dB; t is the thickness of the conductive layer and is in mm; f is the frequency of the electromagnetic wave and has the unit of Hz; mu.srIs relative magnetic permeability; sigmarTo obtain the conductivity σ of copper relative to the conductivity of copper, 5.82 × 107S/m, it can be seen that the better the conductivity of the material, the higher the shielding effectiveness, given the thickness of the conductive layer and the frequency of the electromagnetic waves.
Meanwhile, the middle frame of the mobile phone is generally made of aluminum alloy and fireproof PC base materials, and the formed conductive coating is required to be completely dried at the temperature lower than 100 ℃ so as to prevent the base materials from being deformed at high temperature and damaged.
In summary, there is a need to develop a conductive paste with better conductivity and lower complete drying temperature for the requirement of an electromagnetic shielding coating of 5G personal communication devices such as 5G mobile phones, and the like, and to meet the requirements of electromagnetic shielding effectiveness and substrate adaptability of the 5G personal communication devices such as 5G mobile phones, and the like.
Disclosure of Invention
In order to achieve the purpose, the invention provides the electromagnetic shielding silver paste applied to the 5G personal communication equipment and the preparation method thereof.
The 5G personal communication equipment comprises a 5G mobile phone, a 5G notebook computer, a 5G tablet computer and the like.
In a first aspect, the invention provides an electromagnetic shielding silver paste applied to 5G personal communication equipment, which comprises 3-10 wt% of high-adhesion resin, 15-30 wt% of solvent, 0.5-5 wt% of adhesion promoter, 0.3-5 wt% of curing catalyst and 15-80 wt% of flake silver powder based on the total mass of the electromagnetic shielding silver paste.
Preferably, in order to further enable the electromagnetic shielding silver paste to have better conductivity, lower complete drying temperature, good electromagnetic shielding performance and better substrate adhesion and substrate adaptability, the electromagnetic shielding silver paste contains, by taking the total mass as a reference, 6-10 wt% of high-adhesion resin, 15-20 wt% of solvent, 0.5-2 wt% of adhesion promoter, 0.3-1 wt% of curing catalyst and 60-80 wt% of flake silver powder.
In the present invention, the high adhesion resin refers to a resin having an adhesion of 3B or more to a substrate of a conductive area commonly used in a personal communication device, for example, a metal (e.g., aluminum alloy) or a plastic (e.g., fire-resistant PC). The base material with good adaptability in the invention means that the base material applied to the conductive area of the electromagnetic shielding silver paste of 5G personal communication equipment has high adhesion and strong corrosion resistance, and can keep stable resistivity for a long time in the environments of temperature alternation, water vapor, salt mist and the like, thereby ensuring stable electromagnetic shielding effect.
Preferably, in order to enable the electromagnetic shielding silver paste to have better conductivity, lower complete drying temperature and good electromagnetic shielding efficiency, the substrate adhesive force and the substrate adaptability are better, meanwhile, the silver paste is not easy to precipitate and is more convenient to store, and the electromagnetic shielding silver paste further contains 0.5-5 wt% of an anti-precipitation auxiliary agent by taking the total mass of the electromagnetic shielding silver paste as a reference.
Preferably, in order to enable the electromagnetic shielding silver paste to have better conductivity, lower complete drying temperature, good electromagnetic shielding efficiency and better adaptability of the base material, prevent sagging and facilitate construction, the electromagnetic shielding silver paste further contains 0.5-5 wt% of a sagging prevention auxiliary agent based on the total mass of the electromagnetic shielding silver paste.
Preferably, in order to further enable the base material adhesive force and the base material adaptability of the electromagnetic shielding silver paste to be better, the conductivity to be better, the complete drying temperature to be lower and the electromagnetic shielding effectiveness to be good, the high-adhesive-force resin comprises one or more of polyester resin, polyurethane resin, acrylic resin and modified resins of the three resins.
More preferably, in order to further enable the base material adhesion and the base material adaptability of the electromagnetic shielding silver paste to be better, and simultaneously enable the complete drying temperature to be lower, the conductivity to be better and the electromagnetic shielding performance to be good, the glass transition temperature (Tg) of the high-adhesion resin is 50-80 ℃.
Preferably, in order to further lower the complete drying temperature of the electromagnetic shielding silver paste, and to achieve better conductivity, good electromagnetic shielding performance, and good substrate adhesion and substrate adaptability, the solvent includes a ketone solvent or a ketone solvent mixture, an ester solvent or an ester solvent mixture, or a mixture of a ketone solvent and an ester solvent, and the boiling point is 120 ℃ to 220 ℃, and the solvent may be one or more of a ketone solvent such as methyl isoamyl ketone, cyclohexanone, diisobutyl ketone, isophorone, and an ester solvent such as butyl acetate, amyl acetate, propylene glycol methyl ether acetate, ethylene glycol butyl ether acetate, diethylene glycol ethyl ether acetate, and DBE.
The adhesion promoter in the present invention may be a coupling agent commonly available on the market. Preferably, in order to further enable the substrate adhesion and the substrate adaptability of the electromagnetic shielding silver paste to be good, and simultaneously enable the complete drying temperature to be lower, the conductivity to be better and the electromagnetic shielding performance to be good, the adhesion promoter comprises one or more of a silane coupling agent, a titanate coupling agent and an aluminate coupling agent.
Preferably, in order to further enable the electromagnetic shielding silver paste to have better conductivity, lower complete drying temperature, good electromagnetic shielding performance and good substrate adhesion and substrate adaptability, the curing catalyst is a curing catalyst which can be deblocked at a low temperature of 80 ℃, for example, a blocked isocyanate or dicyandiamide modified curing catalyst.
Preferably, in order to further enable the electromagnetic shielding silver paste to have better conductivity, lower complete drying temperature, good electromagnetic shielding performance and good substrate adhesion and substrate adaptability, the silver powder comprises flake silver powder with the particle size of 5-10 μm or a mixture of the flake silver powder with the particle size of 5-10 μm and the flake silver powder with the particle size of 0.5-5 μm.
The anti-settling auxiliary agent can be a common anti-settling auxiliary agent in the market. Optionally, in order to make the electric conductivity of the electromagnetic shielding silver paste better, the complete drying temperature is lower, the electromagnetic shielding effectiveness is good, the substrate adhesion and the substrate adaptability are good, meanwhile, the silver paste is not easy to precipitate and is more convenient to store, and the anti-precipitation auxiliary agent can comprise one or more of polyethylene wax, polyamide wax, fumed silica and carbon black.
The anti-sagging auxiliary agent can be a common powder directional auxiliary agent on the market. Optionally, in order to enable the electromagnetic shielding silver paste to have better conductivity, lower complete drying temperature, good electromagnetic shielding performance and good substrate adhesion and substrate adaptability, and simultaneously prevent sagging and facilitate construction, the sagging prevention auxiliary agent may include one or more of BYK410, BYK411, BYK415, BYK420, BYK428, BYK430, dow corning DC3 and cellulose acetate butyrate.
In a second aspect, the invention further provides a preparation method of the electromagnetic shielding silver paste applied to the 5G personal communication device, which comprises the following steps:
(1) firstly, mixing the high-adhesion resin and the solvent at the temperature of 60-90 ℃ until the high-adhesion resin and the solvent are uniformly dissolved, and cooling to room temperature;
(2) uniformly mixing the uniformly dissolved high-adhesion resin and solvent with the adhesion promoter and the curing catalyst;
(3) then grinding until the fineness is reduced to below 5 mu m;
(4) and adding silver powder into the silver paste, uniformly mixing, grinding the fineness of the silver paste to be below 15 mu m, and finishing the preparation of the electromagnetic shielding silver paste.
The mixing in the preparation method of the invention can adopt a common stirring mode, for example, the mixing can be carried out in a double-planet stirring device.
Preferably, in order to further mix the high-adhesion resin and the solvent in the step (1) at a temperature of 60-90 ℃ until the high-adhesion resin and the solvent are uniformly dissolved, the mixing time is 4-8 h.
Preferably, in order to further uniformly mix the high-adhesion resin and the solvent with the adhesion promoter and the curing catalyst in the step (2), the mixing can be carried out in a double-planet stirring device, the dispersion rotating speed is 600-1200R/min, the dispersion time is 10-30 min, and the stirring rotating speed is 40-100R/min.
If the electromagnetic shielding silver paste contains the anti-settling auxiliary agent and/or the anti-sagging auxiliary agent, the electromagnetic shielding silver paste is uniformly mixed with the high-adhesion resin, the solvent, the adhesion promoter and the curing catalyst in the step (2).
The grinding in the preparation method of the invention can adopt a common grinding mode, such as a three-roll mill.
The invention has the following advantages:
1. the volume resistivity of the existing commercial low-temperature conductive silver paste is generally 3 × 10-5Ω.cm～5×10-5The minimum volume resistivity of the electromagnetic shielding silver paste can reach 1.5 × 10-5Omega cm, the electric conductivity is good, the electromagnetic shielding efficiency is greatly improved through the reduction of the resistivity, the electromagnetic shielding requirement of the 5G mobile phone is completely met, and the electromagnetic shielding efficiency is good.
2. The complete drying temperature of the existing commercially available low-temperature conductive silver paste is generally 120-150 ℃. The electromagnetic shielding silver paste can be completely dried at the temperature of 80 ℃ for 40-60min, and the deformation and damage of the base material of the conductive area of the personal communication equipment and the fireproof PC base material at high temperature are greatly reduced.
3. The electromagnetic shielding silver paste disclosed by the invention has the advantages that the corrosion resistance is enhanced through the action of the adhesion promoter and the curing catalyst, the stable resistivity can be kept for a long time in the environments of temperature alternation, water vapor, salt mist and the like, the adaptability of the base material is good, the adhesion with the base material in the conductive area of the personal communication equipment is good, and the adhesion with an aluminum alloy base material and a fireproof PC base material of a mobile phone is more than or equal to 4B, so that the stable electromagnetic shielding effect is ensured.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
Example 1
The preparation method of the electromagnetic shielding silver paste applied to the 5G personal communication equipment comprises the following steps:
(1) firstly, 6g of polyester resin, 6g of methyl isoamyl ketone, 5g of cyclohexanone, 3g of butyl acetate and 2g of propylene glycol methyl ether acetate are mixed for 6 hours at the temperature of 70 ℃, uniformly dissolved and cooled to room temperature to obtain a mixture A;
(2) then dispersing the mixture A, 1g of silane coupling agent, 0.5g of blocked isocyanate, 0.7g of polyethylene wax, 0.4g of BYK410 and 0.4g of cellulose acetate butyrate in a double-planet stirring device at a dispersion rotating speed of 1000R/min for 20min and a stirring rotating speed of 80R/min to obtain a mixture B;
(3) then grinding the mixture B until the fineness is reduced to 1 mu m to obtain a mixture C;
(4) and adding 40g of flake silver powder with the particle size of 5-10 microns and 35g of flake silver powder with the particle size of 0.5-5 microns into the mixture C, uniformly mixing, and grinding the mixture to the fineness of 1 micron to finish the preparation of the electromagnetic shielding silver paste S1.
Example 2
The preparation method of the electromagnetic shielding silver paste applied to the 5G personal communication equipment comprises the following steps:
(1) firstly, 6.5g of polyurethane resin, 5g of methyl isoamyl ketone, 5g of diisobutyl ketone, 4.6g of amyl acetate and 5g of butyl cellosolve acetate are mixed for 5 hours at the temperature of 80 ℃, uniformly dissolved and cooled to room temperature to obtain a mixture A;
(2) then dispersing the mixture A, 1g of titanate coupling agent, 0.6g of dicyandiamide modified curing catalyst, 1.2g of polyamide wax, 0.6g of BYK411 and 0.5g of Dow Corning DC3 in a double-planet stirring device at a dispersion rotating speed of 900R/min for 15min and a stirring rotating speed of 70R/min to obtain a mixture B;
(3) then grinding the mixture B until the fineness is reduced to 1 mu m to obtain a mixture C;
(4) and adding 50g of flake silver powder with the particle size of 5-10 microns and 20g of flake silver powder with the particle size of 0.5-5 microns into the mixture C, uniformly mixing, and grinding the mixture to the fineness of 2 microns to finish the preparation of the electromagnetic shielding silver paste S2.
Example 3
The preparation method of the electromagnetic shielding silver paste applied to the 5G personal communication equipment comprises the following steps:
(1) firstly, mixing 8g of acrylic resin, 5g of diisobutyl ketone, 5g of isophorone, 5g of diethylene glycol ethyl ether acetate and 5g of DBE at the temperature of 75 ℃ for 7 hours, uniformly dissolving, and cooling to room temperature to obtain a mixture A;
(2) then dispersing the mixture A, 2g of aluminate coupling agent, 1g of blocked isocyanate, 4g of fumed silica, 3g of BYK415 and 2g of BYK420 in a double-planet stirring device at the dispersion rotating speed of 1100R/min for 12min and at the stirring rotating speed of 85R/min to obtain a mixture B;
(3) then grinding the mixture B until the fineness is reduced to 1 mu m to obtain a mixture C;
(4) and adding 35g of flake silver powder with the particle size of 5-10 microns and 25g of flake silver powder with the particle size of 0.5-5 microns into the mixture C, uniformly mixing, and grinding the mixture to the fineness of 2 microns to finish the preparation of the electromagnetic shielding silver paste S3.
Example 4
The preparation method of the electromagnetic shielding silver paste applied to the 5G personal communication equipment comprises the following steps:
(1) firstly, 3g of polyester resin, 5g of methyl isoamyl ketone, 5g of cyclohexanone and 5g of butyl acetate are mixed for 4 hours at the temperature of 90 ℃, uniformly dissolved and cooled to room temperature to obtain a mixture A;
(2) then dispersing the mixture A, 0.5g of silane coupling agent, 0.3g of blocked isocyanate, 0.5g of carbon black and 0.7g of BYK428 in a double-planet stirring device at a dispersion rotating speed of 600R/min for 30min and a stirring rotating speed of 40R/min to obtain a mixture B;
(3) then grinding the mixture B until the fineness is reduced to 1 mu m to obtain a mixture C;
(4) and adding 40g of flake silver powder with the particle size of 5-10 microns and 40g of flake silver powder with the particle size of 0.5-5 microns into the mixture C, uniformly mixing, and grinding the mixture to the fineness of 1 micron to finish the preparation of the electromagnetic shielding silver paste S4.
Example 5
The preparation method of the electromagnetic shielding silver paste applied to the 5G personal communication equipment comprises the following steps:
(1) firstly, mixing 10g of polyurethane resin, 10g of methyl isoamyl ketone, 10g of cyclohexanone and 10g of amyl acetate at the temperature of 60 ℃ for 8 hours, uniformly dissolving, and cooling to room temperature to obtain a mixture A;
(2) dispersing the mixture A, 5g of silane coupling agent, 5g of blocked isocyanate, 5g of polyamide wax and 5g of BYK430 in a double-planet stirring device at a dispersion rotation speed of 1200R/min for 10min, and stirring at a stirring rotation speed of 100R/min to obtain a mixture B;
(3) then grinding the mixture B until the fineness is reduced to 1 mu m to obtain a mixture C;
(4) then, 10g of flake silver powder with the particle size of 5-10 μm and 30g of flake silver powder with the particle size of 0.5-5 μm are added into the mixture C, the mixture C is uniformly mixed, and then the fineness is ground to 1 μm, so that the electromagnetic shielding silver paste S5 of the embodiment is prepared.
Example 6
The embodiment is used for testing the electrical property of the electromagnetic shielding silver paste applied to the 5G personal communication equipment
The electromagnetic shielding silver paste slurries of examples 1-5, S1-S5, were uniformly dispersed on an aluminum alloy substrate and then dried at 80 ℃ for 40-60min to give corresponding test coating lines L1-L5 having a line width of 20mm 100mm and an average thickness D of 6 μm: the resistance value of the line L1-L5 was measured by ohmmeter as R (Ω), resistivity was R (Ω) S/L, and then the square resistance value at 1mil (25.4 μm) was calculated by substituting the formula R □ (m Ω/□ @ mil) into R (Ω) line width (mm) D (μm)/[ line length (mm) × 0.254], and the square resistance value was found to be equal to or less than 15m Ω/□ @ mil, and the test results are shown in table 1 below.
TABLE 1 test coating line L1-L5 Electrical Performance test results
| L1 | L2 | L3 | L4 | L5 | |
| Resistance value (omega) | 0.125 | 0.130 | 0.135 | 0.128 | 0.141 |
| Resistivity (omega. cm) | 1.5×10-5 | 1.56×10-5 | 1.62×10-5 | 1.54×10-5 | 1.69×10-5 |
| Square resistance (m omega/□ @ mil) | 5.9 | 6.14 | 6.38 | 6.05 | 6.66 |
Example 7
The embodiment is used for testing the adhesive force performance of the electromagnetic shielding silver paste applied to 5G personal communication equipment
The electromagnetic shielding silver paste slurry of examples 1 to 5 was uniformly dispersed on an aluminum alloy substrate, and then dried at 80 ℃ for 40 to 60min to obtain corresponding test coating lines L6 to L10 having a line width of 20mm 100mm and an average thickness D of 6 μm, and the coating adhesion was tested according to GB/T9286 and 1998 lattice method:
1) dividing a test area with the line width of 20mm 100mm and the average line thickness D of 6 mu m into 100 squares by using a hundred-grid knife;
2) selecting a 3M600 or 3M610 adhesive tape, adhering the adhesive tape to the surface of the square grid, and vertically pulling up the adhesive tape at 90 degrees after air is exhausted;
3) and observing the drop area of the grids, wherein the drop area of the test coating lines L6-L10 is within 5 percent, and the test coating lines belong to 4B.
Example 8
The embodiment is used for testing the electromagnetic shielding effectiveness of the electromagnetic shielding silver paste applied to the 5G personal communication equipment
The conductive silver pastes of examples 1-5 were tested for their electromagnetic shielding effectiveness according to the MIL-DTL-83528C standard, and the results are shown in Table 2 below
Example 9
The embodiment is used for testing the electrical performance of the electromagnetic shielding silver paste applied to the 5G personal communication equipment in the environments of temperature alternation, water vapor, salt fog and the like
The conductive silver pastes of examples 1-5 were tested for moisture resistance, acid resistance and alkali resistance to grade 1 by temperature cycling according to CPCA4302-2016 conductive silver paste.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (5)
1. An electromagnetic shielding silver paste applied to 5G personal communication equipment is characterized by comprising 3-10 wt% of high-adhesion resin, 15-30 wt% of solvent, 0.5-5 wt% of adhesion promoter, 0.3-5 wt% of curing catalyst and 15-80 wt% of flake silver powder by taking the total mass of the electromagnetic shielding silver paste as a reference;
the high-adhesion resin comprises one or more of polyester resin, polyurethane resin, acrylic resin and modified resin of the three resins;
the solvent comprises a ketone solvent or a ketone solvent mixture, an ester solvent or an ester solvent mixture, or a mixture of the ketone solvent and the ester solvent;
the adhesion promoter comprises one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent;
the silver powder comprises flake silver powder with the particle size of 5-10 mu m or a mixture of the flake silver powder with the particle size of 5-10 mu m and the flake silver powder with the particle size of 0.5-5 mu m.
2. The electromagnetic shielding silver paste applied to 5G personal communication equipment according to claim 1, wherein the electromagnetic shielding silver paste comprises 6-10 wt% of the high adhesion resin, 15-20 wt% of the solvent, 0.5-2 wt% of the adhesion promoter, 0.3-1 wt% of the curing catalyst and 60-80 wt% of the flake silver powder based on the total mass of the electromagnetic shielding silver paste.
3. The electromagnetic shielding silver paste applied to 5G personal communication equipment according to claim 1, wherein the solvent comprises one or more of methyl isoamyl ketone, cyclohexanone, diisobutyl ketone, isophorone, butyl acetate, amyl acetate, propylene glycol methyl ether acetate, ethylene glycol butyl ether acetate, diethylene glycol ethyl ether acetate and DBE.
4. The electromagnetic shielding silver paste applied to 5G personal communication equipment according to claim 1 or 2, wherein the curing catalyst is a curing catalyst which can be deblocked at a low temperature of 80 ℃.
5. The preparation method of the electromagnetic shielding silver paste applied to the 5G personal communication equipment, which is characterized by comprising the following steps of:
(1) firstly, mixing the high-adhesion resin and the solvent at the temperature of 60-90 ℃ until the high-adhesion resin and the solvent are uniformly dissolved, and cooling to room temperature;
(2) uniformly mixing the uniformly dissolved high-adhesion resin and solvent with the adhesion promoter and the curing catalyst;
(3) then grinding until the fineness is reduced to below 5 mu m;
(4) adding silver powder into the silver paste, uniformly mixing, grinding the fineness of the silver paste to be below 15 mu m, and finishing the preparation of the electromagnetic shielding silver paste;
the mixing time in the step (1) is 4-8 h; the mixing in the step (2) is dispersing in a double-planet stirring device, wherein the dispersing rotating speed is 600-1200R/min, the dispersing time is 10-30 min, and the stirring rotating speed is 40-100R/min.
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| CN111138836B (en) * | 2020-01-02 | 2022-03-08 | 深圳先进技术研究院 | Flexible electromagnetic shielding composite material and preparation method thereof |
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| CN111587056A (en) * | 2020-05-14 | 2020-08-25 | 湖南省国银新材料有限公司 | Electromagnetic shielding silver paste for communication equipment and preparation method thereof |
| CN112638143B (en) * | 2020-12-24 | 2022-12-27 | 深圳先进电子材料国际创新研究院 | Efficient electromagnetic shielding nano silver paste and preparation method thereof |
| CN112954990A (en) * | 2021-01-27 | 2021-06-11 | 江门江益磁材有限公司 | Electromagnetic wave absorption sheet and preparation method thereof |
| CN113077924B (en) * | 2021-04-13 | 2022-09-30 | 上海玖银电子科技有限公司 | Quick-drying silver paste for graphene heating film and preparation method thereof |
| CN113823438B (en) * | 2021-10-28 | 2024-04-12 | 江苏贝孚德通讯科技股份有限公司 | Silver paste recycling preparation method for spraying dielectric filter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103165219A (en) * | 2011-12-15 | 2013-06-19 | 上海宝银电子材料有限公司 | Iodobromite-free slurry used for large keyboard and preparation method of iodobromite-free slurry |
| CN105280266A (en) * | 2015-12-01 | 2016-01-27 | 天津中科理化新材料技术有限公司 | Touch screen silver paste and preparation method thereof |
| CN109616241A (en) * | 2018-12-29 | 2019-04-12 | 长江润发中科(张家港)纳米科技有限公司 | A kind of low-temperature conductive silver paste and preparation method thereof for graphene Electric radiant Heating Film |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPWO2005017045A1 (en) * | 2003-08-13 | 2007-10-04 | サンスター技研株式会社 | Two-component curable composition |
| EP2119744B1 (en) * | 2007-02-09 | 2019-06-05 | Sunstar Giken Kabushiki Kaisha | Two-component curing composition |
-
2019
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103165219A (en) * | 2011-12-15 | 2013-06-19 | 上海宝银电子材料有限公司 | Iodobromite-free slurry used for large keyboard and preparation method of iodobromite-free slurry |
| CN105280266A (en) * | 2015-12-01 | 2016-01-27 | 天津中科理化新材料技术有限公司 | Touch screen silver paste and preparation method thereof |
| CN109616241A (en) * | 2018-12-29 | 2019-04-12 | 长江润发中科(张家港)纳米科技有限公司 | A kind of low-temperature conductive silver paste and preparation method thereof for graphene Electric radiant Heating Film |
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