CN103031044A - 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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- CN103031044A CN103031044A CN2013100039793A CN201310003979A CN103031044A CN 103031044 A CN103031044 A CN 103031044A CN 2013100039793 A CN2013100039793 A CN 2013100039793A CN 201310003979 A CN201310003979 A CN 201310003979A CN 103031044 A CN103031044 A CN 103031044A
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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 the electronic chemical materials technical field, especially relates to a kind of protective cover that can delay or hinder conductive metallic material generation ion migration when energising.
Background technology
Argent has the characteristic that resistance is low, oxidation slow and its oxide compound also conducts electricity, the conductive silver paste product made from it has better electroconductibility than conductive copper paste, conductive carbon paste product, thereby its application is more extensive, comprises following field: (1) thin film switch and flexible PCB take PET (polyester) as base material; (2) veneer ceramic condenser; (3) voltage dependent resistor and thermistor; (4) piezoelectric ceramics; (5) carbon-film potentiometer; (6) Far infrared heating membrane and with the series derivatives product of Far infrared heating membrane as pyrotoxin or source of radiation.In addition, adopt screen printing mode to be coated in by conductive silver paste and form current-carrying bar or electrode on the film or make flexible printed circuit board, it is simple to have technique, production efficiency high (streamline production), the advantage that comprehensive cost is low.
Yet the series of malpractice that the migration of silver ions causes becomes the large defective of conductive silver paste in using as products such as the new class electric heating products of planar heat producing body and care appliances at electronic product, with carbon ink (carbon slurry and carbon brilliant) class far infrared heating material.The consequence of silver ions migration is: some electronic products are functional when factory inspection, and the parameters index is fully qualified, but after the user uses for some time, find that product resistance increases, or short circuit occurs from logical phenomenon; After potentiometer used for some time, insulation resistance descended, even occurred puncturing or short circuit; After the new electrically heating product used for some time, heating temp descended, and the heating-up time is elongated etc.
The factor of conductive silver ion migration is a lot, its essential reason be silver activity due to; Next is that the dielectric material density of conductive silver paste is inadequate, has small " slit " may become ionic channel; The 3rd is moist existence, and this is a very large inducement of silver ions migration, and its reaction equation is as follows:
H
2O→H
++OH
-；Ag
++OH-→AgOH；2AgOH→Ag
2O+H
2O。
For this reason, to overcoming and preventive measure of silver ions transport phenomena, technology is in the past considered from following two aspects.The one, be conceived to the research and development of conductive silver paste product constituent: innovate preparation and the processing of the used silver powder of conductive silver paste (1); (2) how consideration makes the more densification of medium of conductive silver paste; (3) use alloying conductor electrode (application scenario except a kind of silk-screen conductive silver paste) instead.The 2nd, do exploration and improve from existing conductive silver paste product application process aspect: (1) after silver slurry circuit finished printing, silk-screen one deck carbon slurry was covered on the silver-colored slurry again, and the restriction silver ions is separated out; (2) at the upper and lower layer coating insulation protection coating of silver slurry, form the protection interlayer, stop the immersion of moisture; (3) in the silver slurry, add carbon slurry or a small amount of additive such as oxide compound, silver ions is produced certain obstruct.
But all these measures in the face of the conductive silver paste finished product could not exist silver ions to move such problem fully, still can't be made affirmative acknowledgement (ACK).To be objective, various means have all just played the effect of slowing down or stoping the silver ions migration.
Summary of the invention
For the problems referred to above that prior art exists, the applicant provides a kind of protective cover that slows down or stop the conductive metal ion migration.This protective cover possesses multiple collaborative effectiveness, can slow down or stop the argent ion migration, prevents from causing product performance to descend or forfeiture because the silver ions migration causes resistance change, is particularly useful for the occasions such as conductive silver paste or silver-colored wire, silver electrode, silver contact.
Technical scheme of the present invention is as follows:
A kind of protective cover that slows down or stop the conductive silver ion migration, described protective cover is comprised of the raw material of following parts by weight: 7～12 parts of sericites in powder; 0～5 part of Graphite Powder 99; 80～85 parts of polyester resin solutions; 2～8 parts of dimethyl ester solvents.
The application also provides the preparation method of described protective cover; its concrete preparation method is as follows: with sericite in powder separately or with join in the polyester resin solution after Graphite Powder 99 mixes; add again the dimethyl ester solvent; at first stir pre-mixing; then in stirred vessel, stirred 30～60 minutes; place at last grinding container to grind, it is for subsequent use in depositing under 20～25 ℃ of conditions after being no less than 24 hours to take out mixture after grinding.
Described sericite in powder is the sericite in powder that wet method is made, and its particle diameter≤5 μ m can be crossed 2500 mesh sieves.Described Graphite Powder 99 is the nano-level conducting Graphite Powder 99, and its particle diameter≤0.5 μ m can be crossed 15000 mesh sieves, 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 μ m; Viscosity is 2500～3000 centipoises, solid content 40～60%.
The application also provides the application of described protective cover; its detailed directions is: with described protective cover silk-screen, roller coat or brush on the made printed wiring of conductive silver paste; or brush, point is coated on the silver electrode; in room temperature namely 20～25 ℃ place 1～3 hour after; again 60～90 ℃ of lower bakings 1～3 hour; be warming up to again 100～120 ℃ of bakings 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, belongs to the subspecies of white mica, is the silicate of sheet structure, and its crystal-chemical formula is K
0.5-1(Al, Fe, Mg)
2(SiAl)
4O
10(OH)
2NH
2O, structure is for to clip the compound silica layer that one deck alumina octahedral consists of by two-layer silicon-oxy tetrahedron, tetrahedral top oxygen (active oxygen) and additional negatively charged ion (OH
-) be positioned at two-layer six veils central authorities, consist of active crystal water group.Because be adopt the wet processing manufacturing and sericite in powder, sheet structure is not subjected to the complete processing damage and intactly protected, product radius-thickness ratio large (＞80), proportion 2.6～2.7, Mohs' hardness 2～3.The sericite in powder that wet processing makes, product cut size is thin and distribute narrowly, 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 that high order is counted the superfine graphite powder.Graphite is carbonaceous element Crystalline material, and its crystallization screen work is hexagon stratiform structure, and the distance between each stratum reticulare is
The spacing of carbon atom in the same stratum reticulare (bond distance of C-C key) is
Belong to hexagonal system, the stratiform cleavage that tool is complete.In graphite crystal, because each net interfloor distance is larger, combine with Van der Waals force, namely belong between layers molecular crystal; The carbon atom of same stratum reticulare is with SP
2Hybridized orbital forms covalent linkage, and each carbon atom links to each other with other three atoms with three covalent linkage, and six carbon atom has formed positive six rings of shape repeatedly on same plane, be extended into sheet structure, here the bond distance of C-C key
Or 142PM) just in time be the bond distance's scope that belongs to atomic crystal, therefore for same layer, it is again atomic crystal, and in conjunction with very strong, extremely difficulty is destroyed, the chemical property quite stable between the carbon atom on the same layer.Also each remains next P track at conplane carbon atom, and they are overlapped, form a large π key, and electronics is freer therein, is equivalent to the unbound electron in the metal, so graphite can conduct electricity and heat conduction, this also is that it shows 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, parcel ability to sericite in powder, Graphite Powder 99 is relative better to the adhesive capacity of PET film and conductive silver slurry layer with it, and compactness after the 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 manufacturing 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 form layer by layer in the coating of protective cover gained of preparation and intercepts, and can play excellent iris action, makes the objectionable impurities such as moisture (moisture) be difficult to enter coating inside, thereby plays effect moistureproof to protected object, waterproof.The front is mentioned; an existence that important ambient conditions is moisture of silver ions migration appears in conductive silver; therefore after covering contains the protective cover of sericite in powder on the conductive silver current-carrying bar; its detrimentally affect that is subject to moisture just reduces greatly, also just blocks or stoped the supply approach of the moisture that can participate in the conductive silver Facilitated ion transfer.
(2) in the special crystalline structure of the wet method of using in this protective cover sericite in powder processed, the activity hydroxy (OH that accompanies with tetrahedron top oxygen (active oxygen)
-) have a seizure silver ions (Ag
+) ability, thereby can hold silver ions (Ag
+) and be unlikely and allow silver ions arbitrarily run, thereby stoped the migration of silver ions.
(3) the graphite ore material with mixed crystal feature that uses in this protective cover, it can play following effect in the protective cover protective layer that forms: its scale shape and laminate structure, very stable chemical property help coating to resist the intrusion of moisture (moisture) or other objectionable impuritiess, are conducive to protected object and avoid or affect adversely less; When the graphite body cash belongs to crystal characteristic, be equivalent in its crystalline structure in each carbon atom of unbound electron character in the metal a remaining electronic energy in the large π key of conplane delocalization relative to freely moving, take this, filling in the large π key, movably the electronics generative forces of heaven and earth becomes the negatron cloud, have equally silver ions (Ag
+) sucking action, hinder its migration; In addition, the electronics that can relatively move freely in the large π key is if silver ions (Ag occurring
+) during the situation of migration, can play to a certain extent in a sense the compensation effect of the electronic conduction effect that conductive silver is undertaken.This point also has contribution function to the stable resistance value that contains the associated electrical components and parts product of conductive silver current-carrying bar.
(4) this protective cover adopts 18483
#Vibrin is as the low-melting ink vehicle resin, its film forming matter has preferably compactness, cohesiveness and wet fastness, the in addition introducing of two kinds of functional stuffing sericites in powder and Graphite Powder 99, further improved the compactness extent (can form fine and close layer reticulated structure) of coating, also just encrypted " fence ", sealed tightly " lid ", stopped up the passage of silver ions migration, thereby hindered silver ions (Ag
+) migration.In addition, coating abrasion resistance, physical strength and the permeability resistance of the acquisition of this protective cover also are greatly improved.
The protective cover that the present invention makes can be applicable to various electronic component products such as PET is thin film switch and the flexible circuit panel products of base material; Veneer ceramic condenser product; Voltage dependent resistor and thermistor product; The piezoelectric ceramics product; Carbon-film potentiometer product and new electrically heating product, new type medical equipment take carbon ink (carbon slurry or carbon are brilliant) as pyrotoxin and far infrared radiation source; play the provide protection to conductive silver in the products such as health-care physical therapy, stop the migration of silver ions and then effectively reduce the disadvantageous effect to product performance that related products brings in product useful life period internal cause resistance change.
Description of drawings
Fig. 1 is the processing process figure of the present invention's protective cover of the present invention.
Fig. 2 is conductive silver current-carrying bar is made protective layer with different protective covers resistance-time changing curve.
Embodiment
Below in conjunction with Fig. 1, the present invention is specifically described.
Select commercially available a kind of polyester resin solution, this resin solution has enough adhesive fastness to the film forming matter surface of PET film (sheet), conductive carbon paste and conductive silver paste, and protective layer has good wearability and physical strength.The superfine nano mineral powder refers to sericite in powder or Graphite Powder 99; use separately sericite in powder or be used in combination with Graphite Powder 99; cooperate by a certain percentage as form of bio-carrier and aforesaid polyester resin solution; and select suitable solvent (the present invention selects the dimethyl ester solvent) to the viscosity of mixture; viscosity; solid content adjusts; in container, adopt the preliminary pre-mixing of manual alr mode; place again commercially available ink agitator fully to mix 30～60 minutes; then grind two times at three-roll grinder, at last mixture is placed dedicated container in 20～25 ℃ of static coating that are protected more than 24 hours of temperature.Protective cover is carried out testing performance index, meet rear warehouse-in and place for subsequent use.
The parts by weight of above-mentioned raw materials are: 7～12 parts of sericites in powder; 0～5 part of Graphite Powder 99; 80～85 parts of polyester resin solutions; 2～8 parts of dimethyl ester solvents.
The raw materials used commercial goods that is of protective cover of the present invention, wherein the solid content of polyester liquid is 40～60%, and is preferred 50.0% ± 2.0%, viscosity is 1000～2000 centipoises.Sericite in powder is wet method product processed, and particle diameter≤5 μ m can be crossed 2500 mesh sieves; Preferable particle size≤3 μ m can be crossed 4000 mesh sieves.Electrically conductive graphite is nano level, particle diameter≤0.5 μ m (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 for preparing reaches: fineness≤5 μ m, granularity 2500～3000 centipoises, solid content 55.0% ± 3.0%, the protective cover that formulated obtains should be deposited under 20.0～25.0 ℃ of conditions and be no less than 24 hours and can use.
The protective cover that makes as stated above; be coated on the current-carrying bar (power-on circuit) that is formed by the conductive silver paste printing with screen printing mode; or brush, point is coated on silver electrode, the solder joint, place in room temperature (25 ℃) to place again in the electric heating constant temperature baking oven in 2 hours, with 80 ℃, baking 2 hours; be warming up to again 100 ℃; dried by the fire 2 hours, and guaranteed that coating parched, film forming is good; firm with conductive silver paste and substrate material bonding, farthest play waterproof, moisture-proof role.
Embodiment:
Embodiment 1:
HF-18483# polyester resin solution (solid content 50%, viscosity 1000～2000 centipoises); Wet method sericite in powder processed, particle diameter≤3 μ m; Solvent is DBE (diester mixture).Compositions of mixtures ratio (weight ratio): 85.0 parts of polyester resin solutions, 12.0 parts of wet method sericites in powder processed, 3.0 parts of solvents.
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, adopt first manual alr mode to make it preliminary mixing, again this plastic cement tank is placed on the permanent seat of ink stirrer, rotating speed stirring with 100rpm fully mixed in 30 minutes, after taking out this mixture and putting into the laboratory three-roll grinder and grind two times, mixture places in the dedicated container, in 25 ℃ of temperature place 24 hours for subsequent use.
Embodiment 2:
HF-18483# polyester resin solution (solid content 50%, viscosity 1000～2000 centipoises); Wet method sericite in powder processed, particle diameter≤3 μ m; The superfine graphite powder, particle diameter≤0.5 μ m, carbon content 99.99%; Solvent is DBE (diester mixture).Compositions of mixtures ratio (weight ratio): 82.0 parts of polyester resin solutions, 8.0 parts of wet method sericites in powder processed, 5.0 parts in superfine graphite powder, 5.0 parts of solvents.
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, adopt first manual alr mode to make it preliminary mixing, again this plastic cement tank is placed on the permanent seat of ink stirrer, rotating speed stirring with 100rpm fully mixed in 60 minutes, after taking out this mixture and putting into the laboratory three-roll grinder and grind two times, mixture places in the dedicated container, in 25 ℃ of temperature place 24 hours for subsequent use.
The manufacturability index of the protective cover of above-described embodiment 1,2 preparations must meet the demands.
Above-described embodiment 1,2 relevant former, the auxiliary materials that adopt are the commercial goods, and mainly supplying producer has:
Polyester resin solution, Wuxi City spring scenery printing ink company limited;
The wet method sericite in powder, the sharp Mining Limited Company of Anhui Chuzhou lattice;
The superfine graphite powder, Dongguan prompt one-tenth graphite product company limited;
The too magnificent chemical industry of DBE solvent, Yixing City company limited.
Implement the equipment that protective cover preparation involved in the present invention is adopted, be general-purpose equipment (being buied by market).
Application examples:
Be applied on the conductive silver current-carrying bar on a kind of new electrically heating, the spectrum radiation body as example take protective cover.This electric heating, spectrum radiation body are the critical materials in a kind of Novel medical, care appliance product and leisure, the heating product.
(1) preparation (making) of electric heating, radiation base material
Be printed on special carbon ink (but silk-screen) on the macromolecule membrane (PET or PI film) that meets test, service requirements with method for printing screen; with its curing; with the method for silk screen printing conductive silver paste is coated in the corresponding position of carbon film again on the carbon ink printed matter (carbon film) completely in this curing, slaking again and forms the current-carrying bar; then dry, solidify, obtain electric heating, the radiation base material of processing to be protected.
(2) silk screen printing of protective cover coating
The protective covers of embodiment 1,2 preparations are coated in the method printing of silk screen printing on the conductive silver current-carrying bar of electric heating, radiation base material of step (1) gained (the current-carrying bar be connected wire position to be welded leave in advance exempt to protect blank spot) the formation supercoat.This protective layer is coated with application and placed 60 minutes in room temperature (20.0～25.0 ℃), again in the electric heating constant temperature baking oven with 80 ℃, 120 minutes; 100 ℃, oven dry, completion of cure under 120 minutes conditions, obtained after the cooling protective layer film forming good and with the electric heating of step (1) gained, radiation base material on carbon ink layer, conductive silver slurry layer, PET or PI film the early-products of fine adhesive fastness is all arranged.This early-products obtains the two sides all by the intact black chip prefabrication of special-purpose hot-fusible high-molecular film wrapped through compound working procedure again.
(3) brushing of protective cover (or spot printing)
Finish the default position that is welded to connect wire of chip prefabrication that obtains in step (2) process; the strip off polymer material layer; expose the not blank space of protected applying coating of conductive silver current-carrying bar; be welded to connect wire by processing requirement; this weld and remaining blank space (conductive silver is exposed the position) apply fully in the mode of brushing (or spot printing) with protective cover and protect; then, more in accordance with regulations operation this supercoat is dry, curing.All these operations are finished, and having obtained can the practical 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 is burned the foot massager product;
(3) the various mat product of far infrared (frequency spectrum) health care treatment;
(4) outdoor activity, tourism, life, work are with various far infrared heating warming articles;
(5) all kinds of far-infrared heating, heating, warming apparatus;
(6) all kinds of electronic component products that contain conductive silver circuit (current-carrying bar), silver electrode, silver soldering point and all kinds of derived products thereof etc.
(7) all kinds of electronic component products that contain conducting metal beyond the argent or alloy circuit, electrode, solder joint and all kinds of derived products thereof etc.
Test example:
With embodiment 1, embodiment 2 made protective covers conductive silver current-carrying bar being applied respectively the carbon that makes after the protection is that far infrared heating, radiation-emitting chip sample are called 2# testing plate, 1# testing plate; the chip sample that conductive silver current-carrying bar is made without protective layer coating conservation treatment is called the 3# testing plate, and the chip sample that conductive silver current-carrying bar is made with commercially available commodity carbon slurry (the poly-grand Science and Technology Ltd. in Shanghai product) coating conservation treatment is called the 4# testing plate.The test record as shown in table 1 that the resistance change parallel test obtains is done in the testing plate energising.The unit of resistance data is ohm in the table 1.
Table 1
Wherein, within test period, the 8th day of test, the 18th day, the 4# sample was respectively breakdown twice, was the 4#a sample from the 1st～7 day data therefore, and 8～17 day data are the 4#b sample, and 18～32 days is the 4#c sample.
The test data table of actual observation record shown in the his-and-hers watches 1 gathers the assay of 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 conductive silver current-carrying bar is made protective layer with different protective covers resistance-time changing curve.Consolidated statement 1, table 2 and Fig. 2 are analyzed as follows:
(1) conductive silver current-carrying bar applies the 2# testing plate that embodiment 1 prepared protective cover obtains, and within 32 day testing period, minimum resistance change rate 10.31% (seeing Table 2) is arranged; In addition within the whole testing period, corresponding curve shown in Figure 2 is by several days progressively smooth-going decline of high value of beginning, especially in the second half of test period more aobvious steadily and show the trend parallel with time shaft, that is to say that it is continual and steady that resistance is tending towards.
(2) conductive silver current-carrying bar applies the prepared resulting 1# testing plate of protective cover of embodiment 2, and the resistance change rate within test period is slightly larger than 2# sheet (12.75%), but resistance-time curve rose 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 larger velocity of variation (32.12%); resistance-time curve rose with larger slope at the 23rd day and lifts; show that resistance raises day by day and than the situation of 1# testing plate, the resistance increase is more obvious.
(4) conductive silver current-carrying bar covers the 4# testing plate that commercially available carbon slurry is made protective layer, because the 4# testing plate has not been the same testing plate in fact, does not change so make the resistance of 4# testing plate-time curve among Fig. 2.Can find out that on the data of table 1 though the 4#c sheet of changing for the third time is not breakdown through energising in 15 days, the resistance change rate during this is also 20.24%, and is more much bigger than the resistance change of 1#, 2# testing plate.
Need to prove:
Carbon is the method that the resistance test of far infrared heating, spectrum radiation testing plate adopts four built-in testing sheets to be connected in parallel, energising voltage is 8V, the test period variation of build-in test sheet resistance can be subjected to ambient moisture, temperature undoubtedly, the method that put test contact position, testing plate, the tester, testing tool, the impact of the various factorss such as the fluctuation of test voltage, but data all obtain under parallel condition in the table 1, therefore can think the problem that presents can be described relatively objectively.
In sum, to form by specific proportioning that the protective cover that makes is covered on the conductive silver current-carrying bar be to help to slow down or the resistance change that stops relevant product to move because of silver ions to cause for the mineral material of the related two kinds of special constructions of the present invention and specific low-melting ink vehicle resin.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 slowing down or to stop the silver ions transport phenomena of conductive silver, overcome and solve because of silver ions (Ag as a kind of
+) migration and the electronic component products that causes and derived product resistance change thereof and the product performance brought descend or the new way of this problem that lost efficacy.
Claims (7)
1. protective cover that slows down or stop the conductive silver ion migration is characterized in that described protective cover is comprised of the raw material of following parts by weight:
7～12 parts of sericites in powder; 0～5 part of Graphite Powder 99; 80～85 parts of polyester resin solutions; 2～8 parts of dimethyl ester solvents.
2. preparation method who slows down or stop the protective cover of conductive silver ion migration claimed in claim 1 is characterized in that concrete preparation method is as follows:
With sericite in powder separately or with join in the polyester resin solution after Graphite Powder 99 mixes, add again the dimethyl ester solvent, at first stir pre-mixing, then in stirred vessel, stirred 30～60 minutes, place at last mill to grind, it is for subsequent use in depositing under 20～25 ℃ of conditions after being no less than 24 hours to take out mixture after grinding.
3. protective cover according to claim 1 is characterized in that described sericite in powder is the sericite in powder that wet method is made, and its particle diameter≤5 μ m can be crossed 2500 mesh sieves.
4. protective cover according to claim 1 is characterized in that described Graphite Powder 99 is the nano-level conducting Graphite Powder 99, and its particle diameter≤0.5 μ m can be crossed 15000 mesh sieves, its carbon content 〉=99%.
5. protective cover according to claim 1, the solid content that it is characterized in that described polyester resin solution is 40～60%, viscosity is 1000～2000 centipoises.
6. protective cover according to claim 1 is characterized in that the technic index of described protective cover is: fineness≤5 μ m; Viscosity is 2500～3000 centipoises, solid content 40～60%.
7. application that slows down or stop the protective cover of conductive silver ion migration claimed in claim 1; it is characterized in that its detailed directions is: with described protective cover silk-screen, roller coat or brush on the made printed wiring of conductive silver paste; or brush, point is coated on the silver electrode; in room temperature namely 20～25 ℃ place 1～3 hour after; again 60～90 ℃ of lower bakings 1～3 hour; be warming up to again 100～120 ℃ of bakings 1 ~ 2 hour, guarantee that coating parches and firm with the bonding of conductive silver paste and related substances.
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| CN105158616A (en) * | 2015-09-29 | 2015-12-16 | 长沙市宇顺显示技术有限公司 | Touch screen sensor testing circuit |
| CN105158615A (en) * | 2015-09-29 | 2015-12-16 | 长沙市宇顺显示技术有限公司 | Touch screen sensor testing circuit |
| CN111448621A (en) * | 2018-01-11 | 2020-07-24 | 三菱制纸株式会社 | Conductive material and processing method |
| CN111508636A (en) * | 2020-04-26 | 2020-08-07 | 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 |
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| CN102268220A (en) * | 2011-08-25 | 2011-12-07 | 刘汉杰 | Anti-corrosive paint and application thereof |
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