CN114496402A - Preparation method of fast curing UV silver paste for ITO film of touch screen - Google Patents
Preparation method of fast curing UV silver paste for ITO film of touch screen Download PDFInfo
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- CN114496402A CN114496402A CN202210138937.XA CN202210138937A CN114496402A CN 114496402 A CN114496402 A CN 114496402A CN 202210138937 A CN202210138937 A CN 202210138937A CN 114496402 A CN114496402 A CN 114496402A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/003—Apparatus or processes specially adapted for manufacturing conductors or cables using irradiation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
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Abstract
The invention relates to the technical field of conductive silver paste, in particular to a preparation method of rapid curing UV silver paste for an ITO film of a touch screen, which comprises the following components in parts by weight, 3-10 parts of high-toughness resin and 3-20 parts of organic solvent; 40-50 parts of conductive silver powder; 1-5 parts of a thickening agent; 1-2 parts of a toughening agent; 1-3 parts of an initiator; 1-5 parts of soldering flux; the preparation method comprises the following steps: sequentially mixing, stirring and dispersing high-toughness resin, a thickening agent, a toughening agent, an initiator and an organic solvent to prepare an organic carrier; sequentially adding the soldering flux and the conductive silver powder, and stirring at a high speed; and grinding the obtained slurry into the fineness of 5-10 mu m by using a three-roll grinder to obtain the low-temperature uv silver paste. The invention combines the inorganic material and polymer material composite material technology, has excellent conductivity, good adhesion, short curing time, little environmental pollution, low operation cost and high production efficiency.
Description
Technical Field
The invention relates to the technical field of conductive silver paste, in particular to a preparation method of rapid curing UV silver paste for an ITO (indium tin oxide) film of a touch screen.
Background
The conductive paste is widely applied to electronic information products due to good physical properties of the conductive paste, and higher requirements are put forward on the performance of the conductive paste along with the development of lighter, thinner, more powerful functionality and more environment-friendly electronic products. The low-temperature halogen-free conductive silver paste is widely applied to aspects such as film switches, capacitance electrodes, touch screens and the like due to excellent electrical conductivity, thermal conductivity and practicability. The low-temperature conductive silver paste is uniform paste prepared by stirring and dispersing conductive silver powder serving as a conductive filler, high polymer resin, a solvent, a curing agent, an auxiliary agent, a UV initiator and the like. After the conductive silver paste is printed on the base material, the resin and the UV initiator are gradually reacted and cured under the UV radiation of medium and short waves (300-800 nm) of UV ultraviolet light, and finally a compact conductive film layer is formed.
In the production of the electronic industry, the conventional printing production flow of the ITO film industry is probably as follows: cutting an ITO film, printing silver paste on the ITO film, solidifying the ITO film and etching by laser. The curing needs to be carried out in a low-temperature environment (generally at about 150 ℃) for 5-15min, a drying box needs to be used for curing, and the occupied area of the drying box is large, so that the lean management of a production site is not facilitated.
The UV curing process can greatly improve the production efficiency and the product quality. The curing time of the conventional UV silver paste is about 1-5min, and in the production and use process, a conveyor belt sequential irradiation mode is adopted, so that the production efficiency can be improved, and the problem of production efficiency can be solved by shortening the UV illumination time; however, the technical problems caused by the shortening of the curing time are that: the film layer after curing has weak adhesive force and large volume shrinkage.
Disclosure of Invention
The invention provides a preparation method of a fast curing UV silver paste for an ITO film of a touch screen, which combines the technology of inorganic materials and high polymer materials, and has the advantages of excellent conductivity, good adhesive force, short curing time, little environmental pollution, low operation cost and high production efficiency.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a fast curing UV silver paste for an ITO film of a touch screen comprises the following components, by weight, 3-10 parts of a high-toughness resin and 3-20 parts of an organic solvent; 40-50 parts of conductive silver powder; 1-5 parts of a thickening agent; 1-2 parts of a toughening agent; 1-3 parts of an initiator; 1-5 parts of soldering flux;
the preparation method comprises the following steps: sequentially mixing, stirring and dispersing high-toughness resin, a thickening agent, a toughening agent, an initiator and an organic solvent to prepare an organic carrier; sequentially adding the soldering flux and the conductive silver powder, and stirring at a high speed; and grinding the obtained slurry into the fineness of 5-10 mu m by using a three-roll grinder to obtain the low-temperature uv silver paste.
Preferably, the high-toughness resin has an elongation of more than 200%; the high-toughness resin is selected from one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate, polyacrylic acid and salts thereof, polymethyl methacrylate, maleic acid resin and novolac epoxy resin.
Preferably, the boiling point of the organic solvent is 100-250 ℃.
Preferably, the thickener is a cellulose-based thickener; the thickening agent is selected from one or more of methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose.
Preferably, the toughening agent is nitrile rubber.
Preferably, the initiator is one or more of free radical photoinitiators such as hydroxy-2-methyl-1-phenyl acetone, hydroxycyclohexyl phenyl ketone, trimethyl benzoyl phenyl ethyl phosphonate, phenyl phosphine oxide and the like; one or more cationic photoinitiators such as diaryliodonium salts, triaryliodonium salts, triarylsulfonium hexafluorophosphate, alkyliodiium salts ferrochlorophosphate, bis-hexafluoroantimonate, p-phenylsulfanyldiphenylsulfonium hexafluoroantimonate, and isopropylbenzene salts.
Preferably, the conductive silver powder is spherical, and the particle diameter of the conductive silver powder is 0.1-20 μm.
Preferably, the soldering flux is a no-clean halogen-free soldering flux and consists of rosin resin derivatives, organic acid activators and organic solvents.
The invention has the beneficial effects that: the UV silver paste disclosed by the invention is printed on a substrate, can be cured within 30 seconds after being cured by a UV photocuring machine, forms a tough film layer, has good adhesive force, high surface hardness, strong bending resistance and excellent conductivity, and can effectively meet the production requirements of the electronic industry. The silver paste has the advantages of improving the curing performance of the silver paste, having excellent wear resistance and solvent resistance, having excellent adhesive force performance to a base material, solving the problem of poor adhesive force of the high-conductivity silver paste to a material, and endowing the conductive silver paste with the effects of good adhesive force, wear resistance and excellent mechanical property to the material. The UV curing time is also shortened; the adhesive force after curing is improved. The rapidly-cured UV conductive silver paste can be cured within 10-20s by irradiation of UV equipment, is 6-15 times of the conventional product in mass production, and greatly shortens the curing time so as to improve the production efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 shows the surface condition of the cured product of the present invention after adhesion test;
FIG. 2 shows the surface condition of a conventional product on the market after being cured and subjected to an adhesion test.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood 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.
A fast curing UV silver paste for a touch screen ITO film comprises the following components, by weight, 3-10 parts of a high-toughness resin and 3-20 parts of an organic solvent; 40-50 parts of conductive silver powder; 1-5 parts of a thickening agent; 1-2 parts of a toughening agent; 1-3 parts of an initiator; 1-5 parts of soldering flux;
among them, the high toughness resin is a resin having an elongation of more than 200%, and can be referred to as a high toughness resin: the resin is one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate, poly (meth) acrylic acid and its salt, poly (meth) acrylic acid methyl acetate, maleic acid resin, and novolac epoxy resin.
The organic solvent has a boiling point of 100-250 ℃, and more preferably a volatilization rate of less than 0.1 at a temperature of 150-200 ℃, and has the functions of uniformly and completely dispersing and dissolving the resin and the toughening agent, and the viscosity of the slurry can be adjusted to adapt to printing processes of different manufacturers.
The thickening agent is a cellulose thickening agent; the thickening agent is selected from one or more of methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose; cellulosic thickeners thicken by hydrating swollen long chains, and the system exhibits a pronounced pseudoplastic flow set.
The initiator is one or more of hydroxyl-2-methyl-1-phenyl acetone, hydroxycyclohexyl phenyl ketone, trimethyl benzoyl phenyl ethyl phosphonate, phenyl phosphine oxide and other free radical photoinitiators; one or more cationic photoinitiators such as diaryliodonium salts, triaryliodonium salts, triarylsulfonium hexafluorophosphate, alkyliodiium salts ferrochlorophosphate, bis-hexafluoroantimonate, p-phenylsulfanyldiphenylsulfonium hexafluoroantimonate, and isopropylbenzene salts.
The conductive silver powder is spherical, and the particle diameter of the conductive silver powder is 0.1-20 μm, and more preferably 0.5-5 μm.
The soldering flux is a no-clean halogen-free soldering flux and comprises rosin resin derivatives, organic acid activators, organic solvents and the like.
The toughening agent is nitrile rubber.
The preparation method of the rapid curing UV silver paste for the ITO film of the touch screen comprises the following steps: sequentially mixing, stirring and dispersing high-toughness resin, a thickening agent, a toughening agent, an initiator and an organic solvent to prepare an organic carrier; sequentially adding the soldering flux and the conductive silver powder, and stirring at a high speed; and grinding the obtained slurry into the fineness of 5-10 mu m by using a three-roll grinder to obtain the low-temperature uv silver paste. Wherein the high-speed stirring is 1000-1500 r/min for 10-15 min; printing the obtained slurry on an ITO film through a 325-mesh stainless steel wire net; and finally, placing the printed substrate under a UV light source to irradiate for 10-30s to obtain a cured product. UV light sources generally fall into two categories: the electrode type UV light source and the electrodeless UV light source are adopted.
In the initiation aspect of a UV system, a cation and a free radical polymerization photoinitiator are selected to be mixed and react with a high-toughness resin combination system in a curing way, and the initiator forms an intermediate form of free radicals under the condition of absorbing ultraviolet light; the hydroxyethyl acrylate and the hydroxyethyl methacrylate contain unsaturated functional groups, and the unsaturated bond of the functional group is broken to react with the free radical intermediate to initiate chain polymerization reaction, so that a polymer is formed to achieve the curing effect. The curing performance of the silver paste is improved, the silver paste has excellent wear resistance and solvent resistance, the adhesive force performance to a base material is excellent, the problem of poor adhesive force of the high-conductivity silver paste to a material can be solved, and the effects of good adhesive force, wear resistance and excellent mechanical property to the material are given to the conductive silver paste.
Example 1:
the resin is composed of 10 parts of hydroxyethyl acrylate and hydroxyethyl methacrylate;
20 parts of organic solvent diethylene glycol butyl ether and diethylene glycol monobutyl acetate;
50 parts of spherical conductive silver powder;
thickening agent: 5 parts of carboxymethyl cellulose and hydroxyethyl cellulose;
a toughening agent: 1 part of butadiene acrylonitrile rubber;
initiator: 3 parts of hydroxy-2-methyl-1-phenyl acetone, hydroxycyclohexyl phenyl ketone and triaryl hexafluorophosphate sulfonium salt;
flux: 3 parts of no-clean halogen-free soldering flux.
Example 2:
15 parts of hydroxyethyl methacrylate and hydroxyethyl methacrylate are selected as resin;
25 parts of organic solvent diethylene glycol monobutyl ether and diethylene glycol monobutyl acetate;
45 parts of spherical conductive silver powder;
thickening agent: 5 parts of carboxymethyl cellulose and hydroxyethyl cellulose;
a toughening agent: 1 part of butadiene acrylonitrile rubber;
initiator: 2 parts of hydroxy-2-methyl-1-phenyl acetone, hydroxycyclohexyl phenyl ketone and triaryl hexafluorophosphate sulfonium salt;
flux: 3 parts of no-clean halogen-free soldering flux.
Example 3:
20 parts of hydroxyethyl methacrylate and hydroxyethyl methacrylate are selected as resin;
25 parts of organic solvent diethylene glycol monobutyl ether and diethylene glycol monobutyl acetate;
40 parts of spherical conductive silver powder;
thickening agent: 5 parts of carboxymethyl cellulose and hydroxyethyl cellulose;
a toughening agent: 1 part of butadiene acrylonitrile rubber;
initiator: 2 parts of hydroxy-2-methyl-1-phenyl acetone, hydroxycyclohexyl phenyl ketone and triaryl hexafluorophosphate sulfonium salt;
flux: 3 parts of no-clean halogen-free soldering flux.
Sequentially mixing and stirring the high-toughness resin, the thickening agent, the toughening agent, the initiator and the organic solvent (the high-speed stirring is 1000-1500 revolutions/min for 10-15 min);
dispersing to obtain organic carrier, and sieving with 300 mesh sieve;
sequentially adding the soldering flux and the conductive silver powder, and stirring at a high speed; grinding the obtained slurry by a three-roller grinder, gradually reducing the gap and pressurizing, and grinding into slurry with the fineness of 5-10 mu m and the viscosity of 60 +/-20 Pa.s (the viscosity can be adjusted according to a printing process);
sieving the slurry through a 300-mesh screen to remove impurities such as silver flakes and the like generated in the grinding process;
placing the screened slurry in vacuum stirring equipment, wherein the vacuum degree is less than-0.08 MPa, and the stirring speed is 10rpm, so that bubbles in the slurry are discharged, and the interior of the slurry is uniform;
printing the obtained slurry on an ITO film through a 325-mesh stainless steel wire net;
and (3) placing the printed substrate under a UV light source to irradiate for 10-20s to obtain a cured product.
Experimental example: conductive silver paste curing time and performance test after curing
| Test items | Example 1 | Example 2 | Example 3 | Test method |
| Fineness of mum | 6 | 6 | 6 | Scraper blade fineness gauge |
| Viscosity Pa s | 90 | 120 | 100 | Rrookfield-HBT SC4-14#/6R 10rpm |
| Curing time | 13s | 20s | 25s | Stopwatch |
| Sheet resistance/m omega | 5.2 | 6.5 | 8.5 | Resistance meter |
| Hardness of | 5H | 5H | 5H | Hardness test standard of Chinese pencil |
| Adhesion force | Without falling off | Without falling off | Without falling off | No air bubble after the 3M 600 adhesive tape is pasted, and the tape is torn and pulled |
| Bending | 20 times (twice) | 18 times of | 20 times (twice) | 3kg each time, respectively pressing the weight for 1min |
As shown in fig. 1, the surface characteristics after curing adhesion test are uniform and dense under an electron microscope at 500 times; and fig. 2 shows the surface state of the surface of a conventional product after curing and after an adhesion test at a magnification of 500 times of a magnifying glass.
In conclusion, the UV silver paste is printed on the substrate, can be cured within 30 seconds after being cured by the UV curing machine to form a tough film layer, has good adhesive force, high surface hardness, strong bending resistance and excellent conductivity, and can effectively meet the production requirements of the electronic industry.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A preparation method of a fast curing UV silver paste for an ITO film of a touch screen is characterized by comprising the following components, by weight, 3-10 parts of high-toughness resin and 3-20 parts of an organic solvent; 40-50 parts of conductive silver powder; 1-5 parts of a thickening agent; 1-2 parts of a toughening agent; 1-3 parts of an initiator; 1-5 parts of soldering flux;
the preparation method comprises the following steps: sequentially mixing, stirring and dispersing high-toughness resin, a thickening agent, a toughening agent, an initiator and an organic solvent to prepare an organic carrier; sequentially adding the soldering flux and the conductive silver powder, and stirring at a high speed; and grinding the obtained slurry into the fineness of 5-10 mu m by using a three-roll grinder to obtain the low-temperature uv silver paste.
2. The preparation method of the rapid curing UV silver paste for the ITO film of the touch screen according to claim 1, which is characterized by comprising the following steps: the elongation of the high-toughness resin is more than 200 percent; the high-toughness resin is selected from one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate, polyacrylic acid and salts thereof, polymethyl methacrylate, maleic acid resin and novolac epoxy resin.
3. The preparation method of the rapid curing UV silver paste for the ITO film of the touch screen according to claim 1, which is characterized by comprising the following steps: the boiling point of the organic solvent is 100-250 ℃.
4. The preparation method of the rapid curing UV silver paste for the ITO film of the touch screen according to claim 1, which is characterized by comprising the following steps: the thickening agent is a cellulose thickening agent; the thickening agent is selected from one or more of methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose.
5. The preparation method of the rapid curing UV silver paste for the ITO film of the touch screen according to claim 1, which is characterized by comprising the following steps: the toughening agent is nitrile rubber.
6. The preparation method of the rapid curing UV silver paste for the ITO film of the touch screen according to claim 1, which is characterized by comprising the following steps: the initiator is one or more of hydroxyl-2-methyl-1-phenyl acetone, hydroxycyclohexyl phenyl ketone, trimethyl benzoyl phenyl ethyl phosphonate, phenyl phosphine oxide and other free radical photoinitiators; one or more cationic photoinitiators such as diaryliodonium salts, triaryliodonium salts, triarylsulfonium hexafluorophosphate, alkyliodiium salts ferrochlorophosphate, bis-hexafluoroantimonate, p-phenylsulfanyldiphenylsulfonium hexafluoroantimonate, and isopropylbenzene salts.
7. The preparation method of the rapid curing UV silver paste for the ITO film of the touch screen according to claim 1, which is characterized by comprising the following steps: the conductive silver powder is spherical, and the particle size of the conductive silver powder is 0.1-20 mu m.
8. The preparation method of the rapid curing UV silver paste for the ITO film of the touch screen according to claim 1, which is characterized by comprising the following steps: the soldering flux is a no-clean halogen-free soldering flux and consists of rosin resin derivatives, organic acid activators and organic solvents.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114974655A (en) * | 2022-05-30 | 2022-08-30 | 深圳市首骋新材料科技有限公司 | Organic vehicle, conductive paste and solar cell |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012248370A (en) * | 2011-05-26 | 2012-12-13 | Dainippon Printing Co Ltd | Conductive silver paste |
| CN103131224A (en) * | 2011-11-22 | 2013-06-05 | 珠海东诚光固化材料有限公司 | Ultraviolet curable electrosilvering coating substituting for electroplating or vacuum plating and application thereof |
| CN106205775A (en) * | 2016-07-23 | 2016-12-07 | 佛山市中彩科技有限公司 | A kind of UV conductive silver paste formula and preparation method thereof |
| CN106297949A (en) * | 2015-05-27 | 2017-01-04 | 苏州市贝特利高分子材料股份有限公司 | High conductivity low-temperature silver slurry and preparation method thereof |
| CN106531285A (en) * | 2016-11-03 | 2017-03-22 | 广州市尤特新材料有限公司 | Ultraviolet curing conductive silver slurry, and preparation method and application thereof |
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- 2022-02-15 CN CN202210138937.XA patent/CN114496402A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012248370A (en) * | 2011-05-26 | 2012-12-13 | Dainippon Printing Co Ltd | Conductive silver paste |
| CN103131224A (en) * | 2011-11-22 | 2013-06-05 | 珠海东诚光固化材料有限公司 | Ultraviolet curable electrosilvering coating substituting for electroplating or vacuum plating and application thereof |
| CN106297949A (en) * | 2015-05-27 | 2017-01-04 | 苏州市贝特利高分子材料股份有限公司 | High conductivity low-temperature silver slurry and preparation method thereof |
| CN106205775A (en) * | 2016-07-23 | 2016-12-07 | 佛山市中彩科技有限公司 | A kind of UV conductive silver paste formula and preparation method thereof |
| CN106531285A (en) * | 2016-11-03 | 2017-03-22 | 广州市尤特新材料有限公司 | Ultraviolet curing conductive silver slurry, and preparation method and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114974655A (en) * | 2022-05-30 | 2022-08-30 | 深圳市首骋新材料科技有限公司 | Organic vehicle, conductive paste and solar cell |
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