CN111707723A - Silver/silver chloride slurry with high signal-to-noise ratio for biological detection electrode and preparation method thereof - Google Patents
Silver/silver chloride slurry with high signal-to-noise ratio for biological detection electrode and preparation method thereof Download PDFInfo
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- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 title claims abstract description 88
- 239000002002 slurry Substances 0.000 title claims abstract description 43
- 239000004332 silver Substances 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 58
- 229910052709 silver Inorganic materials 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000002904 solvent Substances 0.000 claims abstract description 24
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- 239000002994 raw material Substances 0.000 claims abstract description 4
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- 239000002245 particle Substances 0.000 claims description 13
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- 238000002156 mixing Methods 0.000 claims description 10
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000000460 chlorine Substances 0.000 claims description 9
- 229910052801 chlorine Inorganic materials 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 9
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000012153 distilled water Substances 0.000 claims description 6
- 239000005457 ice water Substances 0.000 claims description 6
- 239000007791 liquid phase Substances 0.000 claims description 6
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- 239000004925 Acrylic resin Substances 0.000 claims description 4
- 229920000178 Acrylic resin Polymers 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
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- -1 and the like Polymers 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- 239000003759 ester based solvent Substances 0.000 claims description 2
- 239000004210 ether based solvent Substances 0.000 claims description 2
- 239000005453 ketone based solvent Substances 0.000 claims description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 2
- 150000003673 urethanes Chemical class 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 6
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- 238000009776 industrial production Methods 0.000 abstract description 3
- 229910021642 ultra pure water Inorganic materials 0.000 description 4
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 2
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- 239000006228 supernatant Substances 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
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- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
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- 239000011780 sodium chloride Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/327—Biochemical electrodes, e.g. electrical or mechanical details for in vitro measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/301—Reference electrodes
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- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Pathology (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The invention relates to the technical field of conductive paste, and discloses a high signal-to-noise ratio silver/silver chloride paste for a biological detection electrode and a preparation method thereof, wherein the paste comprises the following raw materials in parts by weight: 10 to 60 percent of binder, 18 to 70 percent of silver/silver chloride powder, 10 to 90 percent of solvent and 0.1 to 10 percent of auxiliary agent. The method has the advantages of low sheet resistance, strong anti-interference capability, high signal-to-noise ratio, good biocompatibility and capability of well matching with complex real working environment. The silver/silver chloride slurry with the high signal-to-noise ratio for the biological detection electrode and the preparation method thereof simultaneously use a screen printing process, greatly improve the electrode preparation efficiency, reduce the production cost, meet the biological detection electrode for mass industrial production, solve the problems that the glass shell structure needs to frequently replace electrolyte to ensure the stability of the electrode potential, has the defects of liquid contact potential, poor flexibility, relatively higher cost and the like, and the powder disc structure needs high temperature and high pressure, has complex procedures and higher cost, and is not easy to rapidly produce in a large batch.
Description
Technical Field
The invention relates to the technical field of conductive paste, in particular to silver/silver chloride paste with high signal-to-noise ratio for a biological detection electrode and a preparation method thereof.
Background
The Ag/AgCl electrode is a common reference electrode, has the advantages of low polarization, low impedance, sensitivity to low-frequency electric field and the like, and has wide application in the aspects of electroencephalogram, electromyogram, electrocardio and blood sugar test reference electrodes and the like because the Ag/AgCl electrode can accurately detect bioelectricity signals and is used as a relatively mature biological detection electrode in practical application.
At present, the traditional Ag/AgCl electrode is mainly based on a glass shell structure and a powder disc structure, however, in the using process, the glass shell structure needs to be frequently replaced with electrolyte to ensure the stability of the electrode potential, the defects of poor liquid contact potential, poor flexibility, relatively high cost and the like exist, the powder disc structure needs high temperature and high pressure, the process is complex, the cost is high, and mass rapid production is not easy to realize, so that the silver/silver chloride slurry with high signal to noise ratio for the biological detection electrode and the preparation method thereof are provided to solve the problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the silver/silver chloride slurry with high signal-to-noise ratio for the biological detection electrode and the preparation method thereof, which have the advantages of high preparation efficiency, low production cost and the like, and solve the problems that the structure of a glass shell needs to be frequently changed with electrolyte to ensure the stability of the electrode potential, the defects of poor liquid contact potential, poor flexibility, relatively high cost and the like exist, the structure of a powder disc needs high temperature and high pressure, the process is complex, the cost is high, and the mass rapid production is not easy to realize.
(II) technical scheme
In order to realize the purposes of high preparation efficiency and low production cost, the invention provides the following technical scheme: a silver/silver chloride slurry with high signal-to-noise ratio for a biological detection electrode comprises the following raw materials in parts by weight: 10 to 60 percent of binder, 18 to 70 percent of silver/silver chloride powder, 10 to 90 percent of solvent and 0.1 to 10 percent of auxiliary agent.
Preferably, the adhesive is a film-forming substance in the modified ink and plays a role in skeleton communication. Including but not limited to, for example, at least one of modified epoxy resin, vinyl chloride-vinyl acetate resin, polyester resin, modified acrylic resin, alkyd resin, modified polyamide resin, modified urethane resin, fluororubber, thermoplastic elastomer, rosin-modified resin, and the like, or copolymers thereof.
Preferably, the silver/silver chloride powder is a carrier dispersed in the slurry for conducting current, and is a mixture of silver powder and silver chloride powder, and the mass ratio of the silver powder to the silver chloride powder is as follows: 40-80% of silver powder and 20-60% of silver chloride.
Preferably, the silver powder is one or two of flake and spherical silver powder, and the size of the silver powder satisfies 0.1um-100 um.
Preferably, the silver chloride powder is prepared by a liquid phase method, silver nitrate and a chlorine-containing solution (the molar ratio is 1: 1) are mixed, white silver chloride precipitate is generated by reaction in ice water bath, large particles are crushed by ultrasonic, the mixture is washed by distilled water and alcohol and then dried in vacuum for several hours to obtain white silver chloride powder, and the size of the obtained silver chloride powder is 0.1-10 um.
Preferably, the solvent is characterized by having an ability to dissolve the resin, dispersing the filler and the dissolution aid in the slurry, improving the printability of the slurry, and adjusting the viscosity and the drying speed, and includes, but is not limited to, at least one of aliphatic hydrocarbon solvents, ketone solvents, aromatic hydrocarbon solvents, ester solvents, and alcohol ether solvents.
Preferably, the auxiliary agent is a preparation commonly used in the field of ink paste, and is characterized by having an improvement effect on the conductivity, stability, surface property of a printed product, printability and the like of the paste, including but not limited to at least one of a thickener, a dispersant, a coupling agent, a defoaming agent, a curing agent, a wetting agent, a leveling agent, a cross-linking agent, a stabilizer, an ultraviolet absorber, an antioxidant, glass powder and the like, and the selection of the binder, the solvent and the auxiliary agent is selected and adjusted according to the requirements of the conductivity, viscosity, rheological property, a substrate, a printing method, a heat treatment temperature and the like required by the conductive paste.
The invention provides a preparation method of silver/silver chloride slurry with high signal-to-noise ratio for a biological detection electrode, which comprises the following steps:
1) preparing silver chloride powder, namely mixing silver nitrate and a chlorine-containing solution, reacting in an ice-water bath to generate a white silver chloride precipitate, simultaneously crushing large particles by using ultrasonic waves, washing by using distilled water and alcohol, and drying in vacuum for a plurality of hours to obtain white silver chloride powder, wherein the size of the obtained silver chloride powder is 0.1-10 um;
2) preparing a carrier, namely putting 10-60% of an adhesive and 10-90% of a solvent (0.1-10% of an auxiliary agent) into a round-bottom flask according to the components of the conductive slurry, stirring and dissolving at the speed of 600rpm and the temperature of 60-70 ℃, and uniformly mixing until the mixture is transparent and clear;
3) dispersing, namely putting the liquid-phase material prepared in the step 2 and 18-70% of the silver/silver chloride powder prepared in the step 1 into a dispersing kettle for stirring at the speed of 800rpm and at the temperature of below 40 ℃, and uniformly mixing and pre-dispersing to prepare conductive coarse slurry;
4) grinding, namely transferring the pre-dispersed material obtained in the step (2) into a three-rod machine to be ground to the required fineness;
5) and (4) forming, namely filtering the ground material, and carrying out inspection and packaging procedures to obtain the required conductive paste.
(III) advantageous effects
Compared with the prior art, the invention provides the silver/silver chloride slurry with high signal-to-noise ratio for the biological detection electrode, which has the following beneficial effects:
the silver/silver chloride slurry with high signal-to-noise ratio for the biological detection electrode and the preparation method thereof have the advantages of low sheet resistance, strong anti-interference capability, high signal-to-noise ratio and good biocompatibility, and can be well matched with a complex practical working environment. Meanwhile, the screen printing process is used, so that the electrode preparation efficiency is greatly improved, the production cost is reduced, and the biological detection electrode for large-scale industrial production is met.
Drawings
FIG. 1 is an SEM image of a high signal-to-noise ratio silver/silver chloride slurry for a biological detection electrode and a preparation method thereof according to the invention;
FIG. 2 is an electrocardiogram of the high SNR silver/silver chloride slurry for the biological detection electrode and the preparation method thereof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, a silver/silver chloride slurry with high signal-to-noise ratio for a biological detection electrode comprises the following raw materials in parts by weight: 10 to 60 percent of binder, 18 to 70 percent of silver/silver chloride powder, 10 to 90 percent of solvent and 0.1 to 10 percent of auxiliary agent, wherein the binder is a film forming substance in the modified ink and plays a role of skeleton communication. Including but not limited to at least one of modified epoxy resin, vinyl chloride-vinyl acetate resin, polyester resin, modified acrylic resin, alkyd resin, modified polyamide resin, modified polyurethane resin, fluororubber, thermoplastic elastomer, rosin modified resin, etc. or copolymers thereof, silver/silver chloride powder is a carrier dispersed in the paste for conducting electric current, and is a mixture of silver powder and silver chloride powder, the silver powder and the silver chloride powder satisfying the mass ratio: 40-80% of silver powder and 20-60% of silver chloride, wherein the silver powder is one or two of flake silver powder and spherical silver powder, the size of the silver powder meets 0.1-100 um, the silver chloride powder is self-prepared by a liquid phase method, silver nitrate and chlorine-containing solution (the molar ratio is 1: 1) are mixed, white silver chloride precipitate is generated by reaction in ice-water bath, meanwhile, large particles are crushed by ultrasonic, distilled water and alcohol are used for cleaning, and then vacuum drying is carried out for a plurality of hours to obtain white silver chloride powder, the size of the obtained silver chloride powder is 0.1-10um, the solvent is characterized by having the capacity of dissolving resin, the filler and the dissolving auxiliary agent in the slurry can be dispersed, the printability of the slurry is improved, the viscosity and the drying speed are adjusted, the silver chloride powder comprises at least one of aliphatic hydrocarbon solvent, ketone solvent, aromatic hydrocarbon solvent, ester solvent and alcohol ether solvent, and the auxiliary agent is a common preparation in the field of, the conductive paste is characterized by having an improvement effect on the conductivity, stability, surface performance of a printed product, printability and the like of the paste, and comprising but not limited to at least one of a thickening agent, a dispersing agent, a coupling agent, a defoaming agent, a curing agent, a wetting agent, a leveling agent, a cross-linking agent, a stabilizing agent, an ultraviolet absorbent, an antioxidant, glass powder and the like, and a selection of a binder, a solvent and an auxiliary agent, wherein the selection and the adjustment are carried out according to the requirements of the conductive paste on the conductivity, the viscosity, the rheological property, a substrate, a printing method, the heat treatment temperature and the.
A preparation method of silver/silver chloride slurry with high signal-to-noise ratio for a biological detection electrode comprises the following steps:
1) preparing silver chloride powder, namely mixing silver nitrate and a chlorine-containing solution, reacting in an ice-water bath to generate a white silver chloride precipitate, simultaneously crushing large particles by using ultrasonic waves, washing by using distilled water and alcohol, and drying in vacuum for a plurality of hours to obtain white silver chloride powder, wherein the size of the obtained silver chloride powder is 0.1-10 um;
2) preparing a carrier, namely putting 10-60% of an adhesive and 10-90% of a solvent (0.1-10% of an auxiliary agent) into a round-bottom flask according to the components of the conductive slurry, stirring and dissolving at the speed of 600rpm, keeping the temperature at 60-70 ℃, and uniformly mixing until the mixture is transparent and clear;
3) dispersing, namely putting the liquid-phase material prepared in the step 2 and 18-70% of the silver/silver chloride powder prepared in the step 1 into a dispersing kettle for stirring at the speed of 800rpm and at the temperature of below 40 ℃, and uniformly mixing and pre-dispersing to prepare conductive coarse slurry;
4) grinding, namely transferring the pre-dispersed material obtained in the step (2) into a three-rod machine to be ground to the required fineness;
5) and (4) forming, namely filtering the ground material, and carrying out inspection and packaging procedures to obtain the required conductive paste.
The first embodiment is as follows:
1. according to the method step one, 8.5AgN03 analytical reagent is weighed and dissolved in 500ml of ultrapure water, and stirred by a stirrer. 10g of NaCl analytically pure was weighed out and dissolved in 500mL of ultrapure water, and the NaCI solution was slowly titrated into the AgN03 solution under stirring to produce a granular, fine-grained silver chloride powder precipitate. And (4) pouring out the water layer, cleaning with ultrapure water, carrying out ultrasonic crushing simultaneously, repeating the cleaning ultrasonic operation for multiple times until supernatant liquid is taken, and measuring that the conductivity of the supernatant liquid is consistent with that of the ultrapure water. And soaking the obtained silver chloride powder in alcohol, and then putting the silver chloride powder into a vacuum drying oven for drying at the drying temperature of not higher than 80 ℃ to obtain the silver chloride powder with fine particles. And (3) fully mixing 80% of flake silver powder with the particle size of less than 20um and 20% of prepared silver chloride powder with the particle size of 0.1-10um to obtain the silver/silver chloride powder.
2. Preparing the carrier according to the second method step, wherein the adhesive is 40% of vinyl chloride-vinyl acetate resin and polyurethane resin, and the solvent is 60% of DBE.
3. Dispersing according to the third step of the method, dispersing the silver/silver chloride powder obtained in the step 1 and the step 2, a carrier and 1.5 percent of curing agent
4. Grinding according to the fourth method step, and grinding the coarse pulp obtained in step 3
5. Filtering according to the fifth step of the method, and filtering the slurry obtained in the step 4 to obtain the required conductive slurry
6. And (3) carrying out screen printing on the prepared conductive paste, wherein a flexible substrate is PET, and curing the printed electrode in a preheated box type oven at 150 ℃ for 5min to prepare the chlorine/silver chloride electrode for biological detection.
Example two:
1. according to the silver chloride powder prepared in the embodiment 1, 60% of spherical silver powder with the particle size of less than 50um and 40% of silver chloride powder with the particle size of 0.1-10um are fully mixed to obtain silver/silver chloride powder.
2. Preparing the carrier according to the second method, wherein the adhesive is 35% of vinyl chloride-vinyl acetate copolymer resin and polyester resin, and the solvent is 65% of DBE.
3. Dispersing according to the third step of the method, dispersing the silver/silver chloride powder obtained in the step 1 and the step 2, a carrier and 3 percent of curing agent
4. Grinding according to the fourth method step, and grinding the coarse pulp obtained in step 3
5. Filtering according to the fifth step of the method, and filtering the slurry obtained in the step 4 to obtain the required conductive slurry
6. And (3) carrying out screen printing on the prepared conductive paste, wherein a flexible substrate is PET, and curing the printed electrode in a preheated box type oven at 130 ℃ for 10min to prepare the chlorine/silver chloride electrode for biological detection.
Example three:
1. according to the silver chloride powder prepared in the embodiment 1, 50% of spherical silver powder with the particle size of less than 50um is taken, and the flake silver powder with the particle size of less than 15um and 50% of the prepared silver chloride powder with the particle size of 0.1-10um are fully mixed to obtain the silver/silver chloride powder.
2. Preparing a carrier according to the second method, wherein the adhesive is 48% of vinyl chloride-vinyl acetate copolymer and modified acrylic resin, and the solvent is 52% of DBE.
3. Dispersing according to the third step of the method, dispersing the silver/silver chloride powder obtained by the step 1 and the step 2, a carrier, 2 percent of curing agent and 1 percent of dispersing agent
4. Grinding according to the fourth method step, and grinding the coarse pulp obtained in step 3
5. Filtering according to the fifth step of the method, and filtering the slurry obtained in the step 4 to obtain the required conductive slurry
6. And (3) carrying out screen printing on the prepared conductive paste, wherein a flexible substrate is PET, and curing the printed electrode in a preheated box type oven at 100 ℃ for 30min to prepare the chlorine/silver chloride electrode for biological detection.
The invention has the beneficial effects that: the method has the advantages of low sheet resistance, strong anti-interference capability, high signal-to-noise ratio, good biocompatibility and capability of well matching with complex real working environment. Meanwhile, the screen printing process is used, so that the electrode preparation efficiency is greatly improved, the production cost is reduced, the biological detection electrode for large-scale industrial production is met, the defects that the electrolyte needs to be frequently replaced to ensure the stability of the electrode potential, the liquid contact potential and the flexibility are poor, the cost is relatively high and the like in a glass shell structure are overcome, and the powder disc structure needs high temperature and high pressure, is complex in process, has high cost and is not easy to rapidly produce in a large scale.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The silver/silver chloride slurry with high signal-to-noise ratio for the biological detection electrode is characterized by comprising the following raw materials in parts by weight: 10 to 60 percent of binder, 18 to 70 percent of silver/silver chloride powder, 10 to 90 percent of solvent and 0.1 to 10 percent of auxiliary agent.
2. The silver/silver chloride paste with high signal-to-noise ratio for the biological detection electrode as claimed in claim 1, wherein the adhesive is a film forming substance in modified ink and plays a role in skeleton communication. Including but not limited to, for example, at least one of modified epoxy resin, vinyl chloride-vinyl acetate resin, polyester resin, modified acrylic resin, alkyd resin, modified polyamide resin, modified urethane resin, fluororubber, thermoplastic elastomer, rosin-modified resin, and the like, or copolymers thereof.
3. The silver/silver chloride slurry with high signal-to-noise ratio for the biological detection electrode according to claim 1, wherein the silver/silver chloride powder is a carrier which is dispersed in the slurry and conducts current, and is a mixture of silver powder and silver chloride powder, and the mass ratio of the silver powder to the silver chloride powder is satisfied: 40-80% of silver powder and 20-60% of silver chloride.
4. The silver/silver chloride slurry with high signal-to-noise ratio for the biological detection electrode according to claim 3, wherein the silver powder is one or two of flake-shaped silver powder and spherical silver powder, and the size of the silver powder is 0.1um to 100 um.
5. The silver/silver chloride slurry with high signal-to-noise ratio for the biological detection electrode according to claim 3, wherein: the silver chloride powder is prepared by a liquid phase method, silver nitrate and a chlorine-containing solution (the molar ratio is 1: 1) are mixed, white silver chloride precipitate is generated by reaction in ice water bath, large particles are crushed by ultrasonic, distilled water and alcohol are used for cleaning, and then vacuum drying is carried out for a plurality of hours to obtain white silver chloride powder, wherein the size of the obtained silver chloride powder is 0.1-10 um.
6. The silver/silver chloride slurry with high signal-to-noise ratio for the biological detection electrode according to claim 1, wherein: the solvent is characterized by having the ability to dissolve resin, dispersing fillers and dissolution aids in the slurry, improving the printability of the slurry, and adjusting the viscosity and drying speed, and includes, but is not limited to, at least one of aliphatic hydrocarbon solvents, ketone solvents, aromatic hydrocarbon solvents, ester solvents, and alcohol ether solvents.
7. The silver/silver chloride slurry with high signal-to-noise ratio for the biological detection electrode according to claim 1, wherein: the auxiliary agent is a common preparation in the field of ink slurry, and is characterized by having an improvement effect on the conductivity, stability, surface performance of a printed product, printability and the like of the slurry, and comprising at least one of a thickening agent, a dispersing agent, a coupling agent, a defoaming agent, a curing agent, a wetting agent, a flatting agent, a crosslinking agent, a stabilizer, an ultraviolet absorbent, an antioxidant, glass powder and the like, wherein the selection of the binder, the solvent and the auxiliary agent is selected and adjusted according to the requirements of the conductivity, the viscosity, the rheological property, the substrate, the printing method, the heat treatment temperature and the like required by the conductive slurry.
8. A preparation method of silver/silver chloride slurry with high signal-to-noise ratio for a biological detection electrode is characterized by comprising the following steps:
1) preparing silver chloride powder, namely mixing silver nitrate and a chlorine-containing solution, reacting in an ice-water bath to generate a white silver chloride precipitate, simultaneously crushing large particles by using ultrasonic waves, washing by using distilled water and alcohol, and drying in vacuum for a plurality of hours to obtain white silver chloride powder, wherein the size of the obtained silver chloride powder is 0.1-10 um;
2) preparing a carrier, namely putting 10-60% of an adhesive and 10-90% of a solvent (0.1-10% of an auxiliary agent) into a round-bottom flask according to the components of the conductive slurry, stirring and dissolving at the speed of 600rpm and the temperature of 60-70 ℃, and uniformly mixing until the mixture is transparent and clear;
3) dispersing, namely putting the liquid-phase material prepared in the step 2 and 18-70% of the silver/silver chloride powder prepared in the step 1 into a dispersing kettle for stirring at the speed of 800rpm and at the temperature of below 40 ℃, and uniformly mixing and pre-dispersing to prepare conductive coarse slurry;
4) grinding, namely transferring the pre-dispersed material obtained in the step (2) into a three-rod machine to be ground to the required fineness;
5) and (4) forming, namely filtering the ground material, and carrying out inspection and packaging procedures to obtain the required conductive paste.
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