CN103031044B - Protective paint for retarding or preventing migration of conductive silver ions, preparation method and application thereof - Google Patents
Protective paint for retarding or preventing migration of conductive silver ions, preparation method and application thereof Download PDFInfo
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- CN103031044B CN103031044B CN201310003979.3A CN201310003979A CN103031044B CN 103031044 B CN103031044 B CN 103031044B CN 201310003979 A CN201310003979 A CN 201310003979A CN 103031044 B CN103031044 B CN 103031044B
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Abstract
The invention provides a protective paint for retarding or preventing migration of conductive silver ions. The protective paint is prepared from the following raw materials by weight part: 7-12 parts of sericite powder, 0-5 parts of graphite powder, 80-85 powder of polyester resin solution and 2-8 parts of dimethyl solvent. The invention also provides a preparation method and application of the protective paint. The protective paint has a variety of synergetic effects, can retard or prevent migration of conductive silver ions, prevents product performance from being reduced or lost due to resistance variation caused by the migration of silver ions, and is particularly suitable for occasions such as conductive silver paste or silver wires, silver electrodes, silver contacts and the like. In addition, metal or alloy materials for a conductive purpose besides metallic silver can also be used as suitable objects to be protected to achieve the same purpose.
Description
Technical field
The application relates to electronic chemical materials technical field, especially relates to a kind of protective cover that can delay or hinder conductive metallic material to produce ion migration when being energized.
Background technology
Argent has that resistance is low, oxidation is slow and the characteristic that its oxide compound also conducts electricity, the conductive silver paste product made with it has better electroconductibility compared to conductive copper paste, conductive carbon paste product, thus its application is more extensive, comprises following field: (1) is with PET (polyester) be base material thin film switch and flexible PCB; (2) veneer ceramic condenser; (3) voltage dependent resistor and thermistor; (4) piezoelectric ceramics; (5) carbon-film potentiometer; (6) Far infrared heating membrane and using Far infrared heating membrane as the series derivatives product of pyrotoxin or source of radiation.In addition, adopt screen printing mode to be coated in by conductive silver paste and film formed current-carrying bar or electrode or make flexible printed circuit board, there is technique simple, production efficiency high (production line balance), the advantage that comprehensive cost is low.
But the series of malpractice that the migration of silver ions causes becomes conductive silver paste at electronic product, using carbon ink (carbon slurry and carbon crystalline substance) class far infrared heating material as the large defect in the product uses such as the new class electric heating products of planar heat producing body and care appliance.The consequence of silver ion migration is: some electronic products are functional when factory inspection, and parameters index is completely qualified, but after user uses for some time, finds that product resistance increases, or occurs that short circuit is from logical phenomenon; After potentiometer uses for some time, insulation resistance declines, and even occurs puncturing or short circuit; After new electrically heating product uses for some time, heating temp declines, and the heating-up time is elongated.
The factor of conductive silver ion migration is a lot, and its essential reason is caused by the activity of silver; Next is that the dielectric material density of conductive silver paste is inadequate, has small " gap " to become ionic channel; 3rd is moist existence, and this is a very large inducement of silver ion migration, and its reaction equation is as follows:
H
2O→H
++OH
-；Ag
++OH-→AgOH；2AgOH→Ag
2O+H
2O。
For this reason, overcoming and preventive measure silver ion migration phenomenon, technology is in the past considered from following two aspects.One is the research and development being conceived to conductive silver paste product constituent: (1) innovates the preparation of conductive silver paste silver powder used and process; (2) the medium more densification how making conductive silver paste is considered; (3) alloying conductor electrode (application scenario except a kind of silk-screened conductive silver slurry) is used instead.Two is do from existing conductive silver paste product application process aspect to explore and improve: (1) starch after circuit finishes printing at silver, then silk-screen one deck carbon slurry is covered on silver slurry, the precipitation of restriction silver ions; (2) at the upper and lower layer coating insulation protection coating of silver slurry, form protection interlayer, stop the immersion of moisture; (3) in silver slurry, add carbon slurry or a small amount of additive as oxide compound, certain obstruct is produced to silver ions.
But all these measures, in the face of conductive silver paste finished product could not exist the such problem of silver ion migration completely, still cannot make affirmative acknowledgement (ACK).To be objective, various means all just serve the effect slowing down or stop silver ion migration.
Summary of the invention
For the problems referred to above that prior art exists, the applicant provides a kind of protective cover slowing down or stop conductive metal ion to move.This protective cover possesses multiple synergistic effects, can slow down or stop argent ion migration, prevents from, because silver ion migration causes resistance change cause product performance to decline or lose, being particularly useful for the occasion such as conductive silver paste or silver-colored wire, silver electrode, silver contact.
Technical scheme of the present invention is as follows:
Slow down or stop a protective cover for conductive silver ion migration, described protective cover is made up of the raw material of following parts by weight: sericite in powder 7 ~ 12 parts; Graphite Powder 99 0 ~ 5 part; Polyester resin solution 80 ~ 85 parts; Dimethyl ester solvent 2 ~ 8 parts.
Present invention also provides the preparation method of described protective cover; its concrete preparation method is as follows: by sericite in powder separately or join after mixing with Graphite Powder 99 in polyester resin solution; add dimethyl ester solvent again; first stirring pre-mixing is carried out; then stir 30 ~ 60 minutes in stirred vessel; finally be placed in grinding container to grind, after grinding, taking-up mixture is for subsequent use after depositing under 20 ~ 25 DEG C of conditions and being no less than 24 hours.
Described sericite in powder is the sericite in powder that wet method manufactures, and its particle diameter≤5 μm, can cross 2500 mesh sieves.Described Graphite Powder 99 is nano-level conducting Graphite Powder 99, and 15000 mesh sieves can be crossed in its particle diameter≤0.5 μm, its carbon content >=99%.The solid content of described polyester resin solution is 40 ~ 60%, and viscosity is 1000 ~ 2000 centipoises.
The technic index of described protective cover is: fineness≤5 μm; Viscosity is 2500 ~ 3000 centipoises, solid content 40 ~ 60%.
Present invention also provides the application of described protective cover; its detailed directions for: by described protective cover silk-screen, roller coat or brush on the printed wiring made by conductive silver paste; or brush, point be coated in silver electrode; in room temperature i.e. 20 ~ 25 DEG C of placements after 1 ~ 3 hour; dry 1 ~ 3 hour at 60 ~ 90 DEG C again; be warming up to 100 ~ 120 DEG C again to dry 1 ~ 2 hour, guarantee that coating parches and firm with the bonding of conductive silver paste and related substances.
The sericite that the present invention uses is a kind of natural particulate white mica, and belong to the subspecies of white mica, be the silicate of sheet structure, its crystal-chemical formula is K
0.5-1(Al, Fe, Mg)
2(SiAl)
4o
10(OH)
2nH
2o, structure is clip by two-layer silicon-oxy tetrahedron the compound silica layer that one deck alumina octahedral forms, tetrahedral top oxygen (active oxygen) and additional negatively charged ion (OH
-) be positioned at two-layer six veil central authorities, form the water base group of activated crystalline.Because be the sericite in powder adopting wet processing manufacture and obtain, sheet structure is intactly not protected by complete processing damage, product radius-thickness ratio large (> 80), proportion 2.6 ~ 2.7, Mohs' hardness 2 ~ 3.The sericite in powder that wet processing is obtained, product cut size is thin and distribute narrow, and purity is high, and impurity is few, and whiteness is high, stay in grade.
The Graphite Powder 99 that the present invention uses is high order number superfine graphite powder.Graphite is carbonaceous element Crystalline material, and its crystallization screen work is hexagon laminate structure, and the distance between each stratum reticulare is
in same stratum reticulare, the spacing (bond distance of C-C key) of carbon atom is
belong to hexagonal system, the stratiform cleavage that tool is complete.In graphite crystal, because each stratum reticulare spacing is comparatively large, combines with Van der Waals force, namely belong to molecular crystal between layers; The carbon atom of same stratum reticulare is with SP
2hybridized orbital forms covalent linkage, and each carbon atom is connected with other three atoms with three covalent linkage, and six carbon atom defines the ring of positive six shapes repeatedly in same plane, is extended into sheet structure, here the bond distance of C-C key
or 142PM) be just in time the bond distance's scope belonging to atomic crystal, therefore for same layer, it is again atomic crystal, combines very strong between the carbon atom on same layer, extremely difficult destruction, chemical property quite stable.At conplane carbon atom also each surplus next P track, they are overlapped, form a large π key, and electronics is relatively freer wherein, is equivalent to the unbound electron in metal, so graphite can conduct electricity and heat conduction, this is also its display Metallic Solids feature place.
The low-melting ink vehicle that the present invention uses is a kind of polyester resin solution, this resin is saturated polyester resin, relative better to the adhesive capacity of PET film and conductive silver slurry layer with it to the parcel ability of sericite in powder, Graphite Powder 99, and compactness after resin film forming, physical strength, insulating property, all there is outstanding performance the aspects such as water tolerance.
The technique effect that the present invention is useful is:
(1) sericite in powder of wet method manufacture has excellent laminar crystalline form, and powder granularity can reach micron, nano level, and radius-thickness ratio reaches 80 ~ 120, and specific surface area reaches 1.0 ~ 1.8 × 10
4cm
2/ mol, can be formed and intercept layer by layer, can play excellent iris action, make the objectionable impuritiess such as moisture (moisture) be difficult to enter coat inside in the coating of the protective cover gained of preparation, thus plays effect that is moistureproof to protected object, waterproof.Mention above; conductive silver occurs that an important ambient conditions of silver ion migration is the existence of moisture; therefore after conductive silver current-carrying bar covering the protective cover containing sericite in powder; its detrimentally affect being subject to moisture just reduces greatly, also just blocks or prevent the supply approach of the moisture that can participate in conductive silver Facilitated ion transfer.
(2) in the crystalline structure that the wet method sericite in powder used in this protective cover is special, the activity hydroxy (OH accompanied with tetrahedron top oxygen (active oxygen)
-) there is seizure silver ions (Ag
+) ability, thus silver ions (Ag can be held
+) and be unlikely and allow silver ions arbitrarily run, thus prevent the migration of silver ions.
(3) the graphite ore material with mixed crystal feature used in this protective cover, it can play following effect in the protective cover protective layer formed: its scale shape and laminate structure, very stable chemical property contribute to the intrusion that coating resists moisture (moisture) or other objectionable impuritiess, be conducive to protected object from or affect adversely less; When graphite body cash belongs to crystal characteristic, a remaining electronic energy is equivalent in each carbon atom of unbound electron character in metal in the large π key of conplane delocalization relative to freely moving in its crystalline structure, take this, that fill in large π key, the moveable electronics generative forces of heaven and earth becomes negatron cloud, has equally silver ions (Ag
+) sucking action, hinder it to move; In addition, if there is silver ions (Ag in the electronics that can relatively move freely in large π key
+) move situation time, the compensation effect to the electronic conduction effect that conductive silver is undertaken can be played in a sense to a certain extent.The resistance value of this point to the stable relative electronic components product containing conductive silver current-carrying bar also has contribution function.
(4) this protective cover adopts 18483
#vibrin is as low-melting ink vehicle resin, its film forming matter has good compactness, cohesiveness and wet fastness, in addition the introducing of two kinds of functional stuffing sericites in powder and Graphite Powder 99, further increase the compactness extent (fine and close layer reticulated structure can be formed) of coating, also just encrypted " fence ", seal tightly " lid ", plugged the passage of silver ion migration, thus hindered silver ions (Ag
+) migration.In addition, this protective cover obtains coating abrasion resistance, physical strength and permeability resistance are also greatly improved.
It is thin film switch and the flexible circuit panel products of base material that the protective cover that the present invention obtains can be applicable to various electronic component products such as PET; Veneer ceramic condenser product; Voltage dependent resistor and thermistor product; Piezoelectric ceramics product; Carbon-film potentiometer product and the new electrically heating product, the new type medical equipment that are pyrotoxin and far infrared radiation source with carbon ink (carbon slurry or carbon brilliant); play the provide protection to conductive silver in the products such as health-care physical therapy, stop the migration of silver ions and then effective disadvantageous effect to product performance reducing related products and bring in product useful life period internal cause resistance change.
Accompanying drawing explanation
Fig. 1 is the processing process figure of the present invention's protective cover of the present invention.
Fig. 2 is the resistivity-time change curve that the different protective cover of conductive silver current-carrying bar makes protective layer.
Embodiment
Below in conjunction with Fig. 1, the present invention is specifically described.
Select commercially available a kind of polyester resin solution, there are enough adhesive fastness on the film forming matter surface of this resin solution to PET film (sheet), conductive carbon paste and conductive silver paste, and protective layer has good wearability and physical strength.Superfine nano mineral powder refers to sericite in powder or Graphite Powder 99, be used alone sericite in powder or combinationally use with Graphite Powder 99, coordinate by a certain percentage as form of bio-carrier and aforesaid polyester resin solution, and select suitable solvent (the present invention the selects dimethyl ester solvent) viscosity to mixture, viscosity, solid content adjusts, the preliminary pre-mixing of manual alr mode is adopted in container, be placed in commercially available ink agitator again and fully mix 30 ~ 60 minutes, then grind two times on three-roll grinder, finally mixture is placed in dedicated container and within static more than 24 hours, obtains protective cover in 20 ~ 25 DEG C of temperature.Testing performance index is carried out to protective cover, meets rear warehouse-in and place for subsequent use.
The parts by weight of above-mentioned raw materials are: sericite in powder 7 ~ 12 parts; Graphite Powder 99 0 ~ 5 part; Polyester resin solution 80 ~ 85 parts; Dimethyl ester solvent 2 ~ 8 parts.
Protective cover of the present invention is raw materials used is commercial goods, and wherein the solid content of polyester liquid is 40 ~ 60%, and preferably 50.0% ± 2.0%, viscosity is 1000 ~ 2000 centipoises.Sericite in powder is wet method product, and 2500 mesh sieves can be crossed in particle diameter≤5 μm; Preferable particle size≤3 μm, can cross 4000 mesh sieves.Electrically conductive graphite is nano level, particle diameter≤0.5 μm (15000 order), carbon content >=99%, preferred carbon content >=99.99%.Solvent is a kind of diester mix product.
The manufacturability index of the protective cover prepared reaches: fineness≤5 μm, granularity 2500 ~ 3000 centipoise, solid content 55.0% ± 3.0%, and the protective cover that formulated obtains should be deposited and be no less than 24 hours and can use under 20.0 ~ 25.0 DEG C of conditions.
Protective cover obtained as stated above; be coated on the current-carrying bar (power-on circuit) by conductive silver paste printing with screen printing mode; or brush, point be coated on silver electrode, solder joint, in room temperature (25 DEG C) place within 2 hours, be placed in again in electric heating constant temperature baking oven, with 80 DEG C, dry 2 hours; be warming up to 100 DEG C again; dry 2 hours, guarantee that coating parches, film forming is good; bond firmly with conductive silver paste and substrate material, farthest play waterproof, moisture-proof role.
Embodiment:
Embodiment 1:
HF-18483# polyester resin solution (solid content 50%, viscosity 1000 ~ 2000 centipoise); Wet method sericite in powder, particle diameter≤3 μm; Solvent is DBE (diester mixture).Mixture proportion of composing (weight ratio): polyester resin solution 85.0 parts, wet method sericite in powder 12.0 parts, solvent 3.0 parts.
Above-mentioned load weighted each constituent (adding up to weight 1000.0 grams) is placed in the 5L plastic cement tank of EA-ST208B type ink agitator outfit, manual alr mode is first adopted to make it preliminary mixing, again this plastic cement tank is placed on the permanent seat of ink stirrer, stir with the rotating speed of 100rpm and fully mix for 30 minutes, taking out this mixture puts into after laboratory three-roll grinder grinds two times, mixture is placed in dedicated container, in 25 DEG C of temperature place 24 hours for subsequent use.
Embodiment 2:
HF-18483# polyester resin solution (solid content 50%, viscosity 1000 ~ 2000 centipoise); Wet method sericite in powder, particle diameter≤3 μm; Superfine graphite powder, particle diameter≤0.5 μm, carbon content 99.99%; Solvent is DBE (diester mixture).Mixture proportion of composing (weight ratio): polyester resin solution 82.0 parts, wet method sericite in powder 8.0 parts, 5.0 parts, superfine graphite powder, solvent 5.0 parts.
Above-mentioned load weighted each constituent (adding up to weight 1000.0 grams) is placed in the 5L plastic cement tank of EA-ST208B type ink agitator outfit, manual alr mode is first adopted to make it preliminary mixing, again this plastic cement tank is placed on the permanent seat of ink stirrer, stir with the rotating speed of 100rpm and fully mix for 60 minutes, taking out this mixture puts into after laboratory three-roll grinder grinds two times, mixture is placed in dedicated container, in 25 DEG C of temperature place 24 hours for subsequent use.
The manufacturability index of protective cover prepared by above-described embodiment 1,2 must meet the demands.
Relevant former, auxiliary material that above-described embodiment 1,2 adopts are commercial goods, and main supply producer has:
Polyester resin solution, Wuxi City spring scenery ink company limited;
Wet method sericite in powder, the sharp Mining Limited Company of Anhui Chuzhou's lattice;
Superfine graphite powder, Dongguan Jie Cheng graphite product company limited;
DBE solvent, Yixing City Tai Hua Chemical Co., Ltd..
Implement protective cover involved in the present invention and prepare adopted equipment, be general-purpose equipment (being buied by market).
Application examples:
Be applied in for protective cover on the conductive silver current-carrying bar on a kind of new electrically heating, spectrum radiation body.This electric heating, spectrum radiation body are the critical materials in a kind of Novel medical, care appliance product and leisure, heating product.
(1) preparation (making) of electric heating, radiation base material
Special carbon ink (can silk-screen) is printed on method for printing screen on the macromolecule membrane (PET or PI film) meeting test, service requirements; solidified; with the method for silk screen printing conductive silver paste is coated on the corresponding position of carbon film again in this solidification, slaking completely carbon ink printed matter (carbon film) again and forms current-carrying bar; then carry out drying, solidifying, obtain the electric heating of process to be protected, radiation base material.
(2) the silk screen printing coating of protective cover
Protective cover embodiment 1,2 prepared is coated in the method printing of silk screen printing on the conductive silver current-carrying bar of the electric heating of step (1) gained, radiation base material (current-carrying bar be connected wire position to be welded leave in advance exempt to protect blank spot) form supercoat.This protective layer coating is placed 60 minutes in room temperature (20.0 ~ 25.0 DEG C), then with 80 DEG C in electric heating constant temperature baking oven, 120 minutes; 100 DEG C, to dry under 120 minutes conditions, completion of cure, obtain protective layer film forming after cooling good and all have the early-products of fine adhesive fastness with carbon ink layer on the electric heating of step (1) gained, radiation base material, conductive silver slurry layer, PET or PI film.This early-products obtains two sides all by black chip prefabrication that special hot-fusible high-molecular film wrapped is intact through compound working procedure again.
(3) brushing (or spot printing) of protective cover
The position being welded to connect wire that the chip prefabrication obtained is preset is completed in step (2) process; strip off polymer material layer; expose the blank space of the not protected applying coating of conductive silver current-carrying bar; wire is welded to connect by processing requirement; this weld and remaining blank space (the exposed position of conductive silver) to apply in the mode of brushing (or spot printing) with protective cover and protect completely; then, then by regulation operation by this supercoat drying, solidification.All these operations complete, obtain can be practical the chip material with far infrared heating, spectrum radiation ability.
Gained protective cover of the present invention can be applied in following field, and is not limited to following field:
(1) binding type far infrared (frequency spectrum) health therapy product;
(2) far infrared health care, medical lavipeditum bucket, treatment room, frequency spectrum heat burns foot massager product;
(3) various mat product is used in far infrared (frequency spectrum) health care treatment;
(4) outdoor activity, tourism, life, the various far infrared heating warming article of work;
(5) all kinds of far-infrared heating, heating, warming apparatus;
(6) all kinds of containing conductive silver circuit (current-carrying bar), silver electrode, the electronic component products of silver soldering point and all kinds of derived products thereof etc.
(7) all kinds of electronic component products containing the conducting metal beyond argent or alloy circuit, electrode, solder joint and all kinds of derived products etc. thereof.
Test example:
The carbon system far infrared heating obtained after carrying out applying protection respectively to conductive silver current-carrying bar with embodiment 1, the made protective cover of embodiment 2, radiation-emitting chip sample are called 2# testing plate, 1# testing plate; conductive silver current-carrying bar is called 3# testing plate without the chip sample made of protective layer coating conservation treatment, and conductive silver current-carrying bar applies by commercially available commodity carbon slurry (Shanghai Ju Long Science and Technology Ltd. product) chip sample that conservation treatment makes and is called 4# testing plate.Testing plate energising is done the test record as shown in table 1 that resistance change parallel test obtains.In table 1, the unit of resistance data is ohm.
Table 1
Wherein, within test period, at the 8th day of test, the 18th day, 4# sample respectively breakdown twice, be therefore 4#a sample from the data of 1st ~ 7 days, 8 ~ 17 day data were 4#b sample, within 18 ~ 32 days, are 4#c sample.
The test data table of actual observation record shown in his-and-hers watches 1 carries out the assay gathering calculating, obtains the resistance change rate of testing plate, i.e. (R
max-R
min)/R
max, concrete data are shown in Table 2.
Table 2
| Test approaches | 1# | 2# | 3# | 4#a | 4#b | 4#c |
| Original resistance | 8.87 | 11.68 | 9.91 | 8.53 | 8.73 | 8.61 |
| R max | 8.94 | 11.35 | 9.62 | 8.32 | 7.19 | 8.3 |
| R min | 7.8 | 10.18 | 6.53 | 6.76 | 5.69 | 6.62 |
| (R max-R min)/R max | 12.75％ | 10.31％ | 32.12％ | —— | —— | 20.24％ |
Fig. 2 is the resistivity-time change curve that the different protective cover of conductive silver current-carrying bar makes protective layer.Consolidated statement 1, table 2 and Fig. 2, be analyzed as follows:
(1) conductive silver current-carrying bar applies the 2# testing plate that the protective cover prepared by embodiment 1 obtains, and within 32 day testing period, has minimum resistance change rate 10.31% (see table 2); In addition within the whole testing period, curve corresponding shown in Fig. 2 by the high value progressively smooth-going decline of several days, especially in the second half of test period more aobvious steadily and show the trend parallel with time shaft, that is, resistance is tending towards continual and steady.
(2) the 1# testing plate that obtains of the protective cover of conductive silver current-carrying bar coating prepared by embodiment 2, the resistance change rate within test period is slightly larger than 2# sheet (12.75%), but resistivity-time curve rises in test and can be said to be steady on the 10th day.
(3) conductive silver current-carrying bar does not add the 3# testing plate of any protection; within test period; resistance has a greater change rate (32.12%); at the 23rd day, resistivity-time curve plays that larger slope is lifted; show that resistance raises day by day and than the situation of 1# testing plate, resistance increase is more obvious.
(4) conductive silver current-carrying bar covers the 4# testing plate that protective layer made by commercially available carbon slurry, because 4# testing plate is not same testing plate in fact, so do not make the resistivity-time curvilinear motion of 4# testing plate in Fig. 2.As can be seen from the data of table 1, though the 4#c sheet that third time is changed is not breakdown through energising in 15 days, the resistance change rate during this is also 20.24%, more much bigger than the resistance change of 1#, 2# testing plate.
It should be noted that:
The method that the resistance test of carbon system far infrared heating, spectrum radiation testing plate adopts four built-in testing sheets to be connected in parallel, power-on voltage is 8V, the test period change of build-in test sheet resistance can be subject to ambient moisture, temperature undoubtedly, test contact position, the method that testing plate is put, tester, testing tool, the various factors impacts such as the fluctuation of test voltage, but in table 1, data all obtain under parallel condition, therefore can think and can present problem be described relatively objectively.
In sum, it is the resistance change that contributes to slowing down or stops the product of being correlated with to cause because of silver ion migration that the mineral material of two kinds of special constructions involved by the present invention and specific low-melting ink vehicle resin are covered on conductive silver current-carrying bar by the protective cover that specific proportioning composition is obtained.All by conductive silver paste as the electronic and electrical equipment of printed wiring or electrode or medical treatment, care appliance product, leisure, heating product etc. all can use the method for the invention, in order to slow down or to stop the silver ion migration phenomenon of conductive silver, overcome with solution because of silver ions (Ag as one
+) migration and the electronic component products that causes and derived product resistance change thereof and the product performance brought decline or the new way of this problem that lost efficacy.
Claims (6)
1. slow down or stop a protective cover for conductive silver ion migration, it is characterized in that described protective cover is made up of the raw material of following parts by weight:
Sericite in powder 7 ~ 12 parts; Graphite Powder 99 0 ~ 5 part; Polyester resin solution 80 ~ 85 parts; Dimethyl ester solvent 2 ~ 8 parts;
Described sericite in powder is the sericite in powder that wet method manufactures, and its particle diameter≤5 μm, can cross 2500 mesh sieves.
2. the preparation method of protective cover slowing down or stop conductive silver ion migration according to claim 1, is characterized in that concrete preparation method is as follows:
By sericite in powder separately or join after mixing with Graphite Powder 99 in polyester resin solution, add dimethyl ester solvent again, first stirring pre-mixing is carried out, then stir 30 ~ 60 minutes in stirred vessel, finally be placed in mill to grind, after grinding, taking-up mixture is for subsequent use after depositing under 20 ~ 25 DEG C of conditions and being no less than 24 hours.
3. protective cover according to claim 1, it is characterized in that described Graphite Powder 99 is nano-level conducting Graphite Powder 99, its particle diameter≤0.5 μm, can cross 15000 mesh sieves, its carbon content >=99%.
4. protective cover according to claim 1, it is characterized in that the solid content of described polyester resin solution is 40 ~ 60%, viscosity is 1000 ~ 2000 centipoises.
5. protective cover according to claim 1, is characterized in that the technic index of described protective cover is: fineness≤5 μm; Viscosity is 2500 ~ 3000 centipoises, solid content 40 ~ 60%.
6. the application of protective cover slowing down or stop conductive silver ion migration according to claim 1; it is characterized in that its detailed directions for: by described protective cover silk-screen, roller coat or brush on the printed wiring made by conductive silver paste; or brush, point be coated in silver electrode; in room temperature i.e. 20 ~ 25 DEG C of placements after 1 ~ 3 hour; dry 1 ~ 3 hour at 60 ~ 90 DEG C again; be warming up to 100 ~ 120 DEG C again to dry 1 ~ 2 hour, guarantee that coating parches and firm with the bonding of conductive silver paste and related substances.
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| CN105158615B (en) * | 2015-09-29 | 2018-04-20 | 长沙市宇顺显示技术有限公司 | Touch screen induction device test circuit |
| CN105158616B (en) * | 2015-09-29 | 2018-05-01 | 长沙市宇顺显示技术有限公司 | A kind of touch screen induction device test circuit |
| KR20200108042A (en) * | 2018-01-11 | 2020-09-16 | 미쓰비시 세이시 가부시키가이샤 | Conductive material and processing method |
| CN111508636B (en) * | 2020-04-26 | 2022-08-12 | 安徽精卓光显技术有限责任公司 | Conductive silver paste, conductive circuit, circuit board, terminal and conductive silver paste preparation method |
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| JP4089311B2 (en) * | 2002-07-02 | 2008-05-28 | 住友電気工業株式会社 | Conductive paste, conductive film, and method of manufacturing conductive film |
| CN101362923A (en) * | 2008-09-12 | 2009-02-11 | 上海开林造漆厂 | Resistance-reducing and wear-resisting coatings on concrete substrate |
| CN102268220A (en) * | 2011-08-25 | 2011-12-07 | 刘汉杰 | Anti-corrosive paint and application thereof |
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| JP4089311B2 (en) * | 2002-07-02 | 2008-05-28 | 住友電気工業株式会社 | Conductive paste, conductive film, and method of manufacturing conductive film |
| CN101362923A (en) * | 2008-09-12 | 2009-02-11 | 上海开林造漆厂 | Resistance-reducing and wear-resisting coatings on concrete substrate |
| CN102268220A (en) * | 2011-08-25 | 2011-12-07 | 刘汉杰 | Anti-corrosive paint and application thereof |
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