CN114574056B - Thermoplastic weather-proof protective coating material and preparation method and application thereof - Google Patents
Thermoplastic weather-proof protective coating material and preparation method and application thereof Download PDFInfo
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- CN114574056B CN114574056B CN202210286558.5A CN202210286558A CN114574056B CN 114574056 B CN114574056 B CN 114574056B CN 202210286558 A CN202210286558 A CN 202210286558A CN 114574056 B CN114574056 B CN 114574056B
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- thermoplastic
- coating material
- protective coating
- weather
- leveling agent
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- 239000011253 protective coating Substances 0.000 title claims abstract description 44
- 239000000463 material Substances 0.000 title claims abstract description 35
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 31
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 40
- 229910052751 metal Inorganic materials 0.000 claims abstract description 35
- 239000002184 metal Substances 0.000 claims abstract description 35
- 239000011347 resin Substances 0.000 claims abstract description 30
- 229920005989 resin Polymers 0.000 claims abstract description 30
- 239000002318 adhesion promoter Substances 0.000 claims abstract description 14
- 239000003960 organic solvent Substances 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims description 29
- 238000000576 coating method Methods 0.000 claims description 29
- 239000004925 Acrylic resin Substances 0.000 claims description 17
- 229920000178 Acrylic resin Polymers 0.000 claims description 12
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 12
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 10
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical group CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 claims description 10
- 229920001577 copolymer Polymers 0.000 claims description 10
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 claims description 8
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 5
- 239000012948 isocyanate Substances 0.000 claims description 5
- 150000002513 isocyanates Chemical class 0.000 claims description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 5
- 229940116333 ethyl lactate Drugs 0.000 claims description 4
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 150000001252 acrylic acid derivatives Chemical class 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 210000000689 upper leg Anatomy 0.000 claims 1
- 239000002904 solvent Substances 0.000 abstract description 17
- 238000002844 melting Methods 0.000 abstract description 5
- 230000008018 melting Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 32
- 238000001723 curing Methods 0.000 description 10
- 239000007788 liquid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 239000003292 glue Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000011241 protective layer Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000012943 hotmelt Substances 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 2
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- LCTONWCANYUPML-UHFFFAOYSA-N Pyruvic acid Chemical compound CC(=O)C(O)=O LCTONWCANYUPML-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 150000002576 ketones Chemical class 0.000 description 2
- AYLRODJJLADBOB-QMMMGPOBSA-N methyl (2s)-2,6-diisocyanatohexanoate Chemical compound COC(=O)[C@@H](N=C=O)CCCCN=C=O AYLRODJJLADBOB-QMMMGPOBSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 2
- TYEYBOSBBBHJIV-UHFFFAOYSA-N 2-oxobutanoic acid Chemical compound CCC(=O)C(O)=O TYEYBOSBBBHJIV-UHFFFAOYSA-N 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- KXBFLNPZHXDQLV-UHFFFAOYSA-N [cyclohexyl(diisocyanato)methyl]cyclohexane Chemical compound C1CCCCC1C(N=C=O)(N=C=O)C1CCCCC1 KXBFLNPZHXDQLV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- SOGAXMICEFXMKE-UHFFFAOYSA-N alpha-Methyl-n-butyl acrylate Natural products CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- XPPWAISRWKKERW-UHFFFAOYSA-N copper palladium Chemical compound [Cu].[Pd] XPPWAISRWKKERW-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009658 destructive testing Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012454 non-polar solvent Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229940107700 pyruvic acid Drugs 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides a thermoplastic weather-proof protective coating material, a preparation method and application thereof, wherein the thermoplastic weather-proof protective coating material comprises the following components: (A) a resin; (B) a leveling agent; (C) an adhesion promoter; and (D) an organic solvent. The thermoplastic weather-resistant protective coating material can simultaneously meet the requirements of lightening and thinning of devices, solvent resistance, hot melting, weather resistance and the like, relatively saves cost and has high product yield, so the thermoplastic weather-resistant protective coating material has excellent performance when being applied to a metal grid touch sensor.
Description
Technical Field
The invention belongs to the field of chemical protective coating materials, and particularly relates to a thermoplastic weather-resistant protective coating material and a preparation method and application thereof.
Background
In recent years, compared with ITO and nano-silver technologies, metal grid touch sensors have been widely studied because of their advantages of being more easily foldable, better light-transmitting, lighter and thinner, lower in resistance, and easily large in screen size.
With the wider application range of the metal grid touch sensor, the requirements on products are also upgraded. From pen power to mobile phones, devices are required to be thinner and thinner; from indoor touch control to vehicle-mounted industrial control, the working environment borne by the device is required to be more and more severe; module manufacturers need to clean the devices in the process of assembling the touch screen, and the surfaces of the devices are required to have better solvent resistance.
In order to meet the requirements, the common practice in the field is two, namely 1) when the metal grid touch sensor is assembled into a touch module, explosion-proof PET is superposed on the surface of the metal grid touch sensor through OCA glue, but the scheme has higher cost and the whole machine is relatively thick; 2) A layer of protective coating is prepared on the metal grid touch sensor, and the coating not only protects the metal grid circuit, but also meets the requirement that anisotropic conductive adhesive can be smoothly hot-melted and conducted when ACF is bound. The protective coating commonly used in the prior art can realize poor protective capability of a formula for melting conduction and is difficult to pass a severe weather resistance test; the formula which can meet the weather resistance and the solvent resistance is difficult to melt smoothly; resulting in the need to add more process steps to make up for the deficiency.
Therefore, it is urgently needed to develop a protective coating material which can simultaneously satisfy the requirements of realizing lightness and thinness of devices, solvent resistance, hot melt property, weather resistance and the like.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a thermoplastic weather-resistant protective coating material which can be prepared on the surface of a metal mesh device in a thickness of 1-3 mu m by various coating modes, so that the solvent resistance of the device is improved, the weather resistance of the device is enhanced while the lightness and thinness are ensured, and the characteristic of smooth hot melting during binding is met, thereby simultaneously realizing the lightness and thinness, the solvent resistance, the hot melting and the weather resistance of the device, relatively saving the cost and having high product yield.
In order to achieve the above object, in one aspect, the present invention provides a thermoplastic type weather-resistant protective coating material comprising the following components:
(A) A resin;
(B) Leveling agent;
(C) An adhesion promoter; and
(D) An organic solvent.
In another aspect, the present invention also provides a thermoplastic type weather-resistant protective coating material comprising the following components:
(A) 10-30wt% resin, such as 10wt%, 12wt%, 15wt%, 18wt%, 20wt%, 22wt%, 25wt%, 28wt%, or 30wt% resin;
(B) 0.1-2wt% of a leveling agent, such as 0.1wt%, 0.2wt%, 0.5wt%, 0.8wt%, 1wt%, 1.2wt%, 1.5wt%, 1.8 wt%, or 2wt% of a leveling agent;
(C) 5-20wt% of an adhesion promoter, for example 5%, 8%, 10%, 12%, 15%, 18% or 20% of an adhesion promoter and
(D) A complementary amount of organic solvent, i.e. the remaining amount of organic solvent to make up 100 wt%.
According to the present invention, the term "resin" refers to an organic polymer that softens or melts when exposed to heat, tends to flow when softened by an external force, and is solid, semi-solid, or liquid at room temperature. In one embodiment of the present invention, the resin may be various known resins commonly used in the art, particularly polyacrylic resins and/or modified acrylic resins. In one embodiment of the present invention, the polyacrylic resin may be selected from one or more of methyl methacrylate or n-butyl methacrylate copolymer with methyl acrylate, ethyl acrylate or n-butyl acrylate, preferably selected from methyl methacrylate/butyl acrylate copolymer (MMA/BA copolymer), methyl methacrylate/ethyl acrylate copolymer (MMA/EA copolymer) or a combination thereof. In another embodiment of the present invention, the modified acrylic resin may be selected from polyurethane modified acrylic resins, preferably, may be selected from T8-1, T46 resins of shanghan airlines. According to research, the polyacrylic resin can show excellent optical performance, good adhesion to a substrate, good adhesion to electroplated metal and good flexibility on the characteristics of a coating film, and the modified acrylic resin can show excellent alcohol resistance and excellent durability on the characteristics of the coating film. Still further, the resin of the present invention may be preferably selected from a combination of both a polyacrylic resin and a modified acrylic resin, and when the resin of the present invention is selected from a combination of both a polyacrylic resin and a modified acrylic resin, both of the polyacrylic resin and the modified acrylic resin may be mixed in a certain mass ratio (e.g., 90%/10%, 80%/20%, 70%/30%, 60%/40%, 50%/50%, 40%/60%, 30%/70%, 20%/80%, 10%/90%).
According to the invention, the term "leveling agent" refers to a commonly used coating additive which can promote a coating to form a flat, smooth and uniform coating film in a drying film-forming process, effectively reduce the surface tension of a coating liquid and improve the leveling property and uniformity of the coating liquid. In a preferred embodiment of the present invention, the leveling agent may be selected from one or more of modified silicone-based, acrylate-based, and fluorine-containing leveling agents. More specifically, the modified silicone-based leveling agent may be selected from one or more of BYK333 and BYK 3550; the acrylate leveling agent can be one or more selected from BYK3560 and BYK 3565; and/or the fluorine-containing leveling agent may be selected from one or more of DuPont FS31 and DuPont FS 3100.
According to the invention, the adhesion promoter can improve the adhesion between the film layer and the metal by acid corrosion of the metal or a metal complex formed by a complex reaction with the metal, has an excellent effect on improving the adhesion of the film layer on the copper metal grid metal, and gradually volatilizes to completely volatilize in the process of baking, drying and film forming of a wet film in an oven at a high temperature after coating construction. In one embodiment of the present invention, the adhesion promoter may be selected from ketone acidic organic solvents with boiling point > 120 ℃, and preferably, the ketone adhesion promoter may be selected from one or more of acetylacetone, 2-ketobutyric acid, or pyruvic acid.
According to the present invention, there is no particular limitation on the kind of the organic solvent as long as it can have good solubility to other components in the thermoplastic type weather-resistant protective coating material of the present invention. In one embodiment of the present invention, the organic solvent may be selected from one or more of ethyl lactate, butyl acetate, ethyl acetate, and ethyl propionate, but is not limited thereto.
In another embodiment of the present invention, the thermoplastic-type weathering protection coating material may further include a curing agent, preferably, 5 to 10wt% (e.g., 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, or 10 wt%) of the curing agent. In a preferred embodiment, the curing agent may be more specifically an isocyanate-based curing agent, more preferably, the isocyanate-based curing agent may be selected from one or more of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene Diisocyanate (HDI), and Lysine Diisocyanate (LDI), and further preferably, may be a K200T series curing agent of shanghai hanfei company.
In another aspect, the present invention also provides a method for preparing the above thermoplastic type weather-resistant protective coating material, which comprises: the resin, the leveling agent, the adhesion promoter and the organic solvent in predetermined proportions (i.e., the above-mentioned proportions of the respective components), and optionally the curing agent are contacted.
In another aspect, the invention also provides the use of the thermoplastic weather-resistant protective coating material for a metal mesh touch sensor.
Compared with the prior art, the technical scheme of the invention at least comprises the following advantages:
1) The thermoplastic weather-resistant protective coating material provided by the invention has lower viscosity and can be matched with various coating modes: including but not limited to slot coating, dimpled coating, knife coating, and the like;
2) The thermoplastic weather-resistant protective coating material provided by the invention has the advantages of wide range of matched substrates and good adhesion. Specifically, with polymeric substrates (PET, COP, CPI, PMMA); metal layers (including copper, copper palladium alloys); the adhesion force of the glass can reach 5B;
3) The thickness of the thermoplastic weather-proof protective coating material after drying can be 1-3 mu m, so that the metal grid sensor is relatively light and thin, explosion-proof PET does not need to be superposed when the thermoplastic weather-proof protective coating material is assembled in a touch screen, and the thickness of the whole machine is also lighter and thinner;
4) The surface of the thermoplastic weather-resistant protective coating material provided by the invention has better solvent resistance after being dried, and the surface of the thermoplastic weather-resistant protective coating material is not dissolved, whitened, scratched and the like when being wiped by one or more of polar/nonpolar solvents such as absolute ethyl alcohol, n-heptane, n-hexane, cyclohexane and the like; and
5) The thermoplastic weather-resistant protective coating material provided by the invention has relatively good weather resistance after being dried, can reach weather resistance standards with different requirements without printing insulating ink, reduces the procedures of printing and UV curing the insulating ink, improves the efficiency and reduces the cost. Specifically, the metal mesh sensor coated with the thermoplastic weather-resistant protective coating material provided by the invention can pass a weather resistance test after being assembled into a touch module, and the weather resistance test comprises the following steps: high temperature and high humidity (85 ℃,85% humidity 240h, 60 ℃,90% humidity 240 h), cold and hot impact (low temperature-40 ℃ (20 min) -high temperature 65 ℃ (20 min); 100 cycles), UV aging (UVA 340 lamp for UV test; 0.77W/(m) W/(m) W340 lamp for UV test; 0.77W/(m) W2/m 2 Nm)), salt spray test (35 ℃, 5% sodium chloride,pH 6.5-7.2, 96 h), high/low temperature storage (85 ℃/-40 ℃: 240h) High/low temperature operation (65 ℃/-40 ℃:240h operation), high temperature and high humidity operation (temperature 40 ℃, humidity 90%,240h operation).
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Detailed Description
The invention is further illustrated below with reference to examples; these examples do not limit the scope of the invention. Unless otherwise stated, all reagent materials used in the examples were obtained from commercial sources; and instruments and the like used in the analytical test are conventional instruments and the like generally used in the art.
Examples
Example 1
Resin: 25wt%;
an adhesion promoter: 5wt% (acetylacetone);
leveling agent 1:0.3wt% (fluorine-containing leveling aid DuPont FS 31);
leveling agent 2:0.3wt% (modified silicone leveling agent BYK 333);
solvent 1:30wt% butyl acetate;
solvent 2:39.4wt% ethyl lactate;
it is to be explained that the resin described in example 1 is a methyl methacrylate/ethyl acrylate copolymer (molecular weight 140000da, dow Paraloid series resin) and a urethane-modified acrylic resin (shanghai hanfei T8-1 series resin) in a mass fraction of 30:70, and mixing the components together.
The obtained protective coating liquid is prepared, coated on the surface of a metal grid through slit coating, and baked in an oven at 100 ℃ for 2min to obtain the dry film with the thickness of 2.5 mu m.
Example 2
Resin: 25wt%;
adhesion promoters: 20wt% (acetylacetone);
leveling agent: 0.5wt% (organic silicon modified flatting agent BYK 3550);
solvent: 54.5% by weight of butyl acetate;
it is to be explained that the resin described in example 2 is a methyl methacrylate/ethyl acrylate copolymer (molecular weight 140000da, dow Paraloid series resin) and a urethane-modified acrylic resin (shanghai hanfei T46 series resin) in a mass fraction of 40:60, and mixing the components in proportion.
The obtained protective coating liquid is prepared to be coated on the surface of a metal grid through slit coating, and is baked for 2min in a baking oven at 100 ℃, so that the dry film thickness is 2.5 mu m.
Example 3
Resin: 25 wt.%
Curing agent: 5wt% (isocyanate curing agent, shanghai hanfei K200T);
an adhesion promoter: 20wt% (acetylacetone);
leveling agent: 0.5wt% (organic silicon modified flatting agent BYK 3550);
solvent: 49.5% by weight of butyl acetate;
it is to be explained that the resin described in example 3 is a methyl methacrylate/ethyl acrylate copolymer (molecular weight 140000da, dow Paraloid series resin) and a urethane-modified acrylic resin (shanghai hanfei T46 series resin) in a mass fraction of 40:60, and mixing the components in proportion.
The obtained protective coating liquid is prepared, coated on the surface of a metal grid through slit coating, and baked in an oven at 100 ℃ for 2min to obtain the dry film with the thickness of 2.5 mu m.
Comparative example 1
The components are mixed according to the following formula to obtain the thermoplastic type weather-resistant protective coating material:
resin: 20wt% (methyl methacrylate/ethyl acrylate copolymer (molecular weight 140000Da, DOW Paraloid series resin);
leveling agent: 0.5wt% (modified organosilicon leveling agent BYK 333);
organic solvent: 79.5wt% (ethyl lactate);
the obtained protective coating liquid is prepared, coated on the surface of a metal grid through slit coating, and baked in an oven at 100 ℃ for 2min to obtain the dry film with the thickness of 2.5 mu m.
Test example 1 solvent resistance test
After the coating liquid provided with the formula is prepared on a substrate to form a protective layer, the surface of the protective layer is respectively wiped by using dust-free cloth dipped with absolute ethyl alcohol, n-heptane, n-hexane and cyclohexane solvents for 20s, after wiping is finished, the condition of the protective layer is observed, if the phenomena of dissolution, whitening, scratch and the like do not appear on the surface, the protective layer passes a solvent resistance test, otherwise, the protective layer does not pass the solvent resistance test. The results are shown in table 1 below.
Test example 2 adhesion test
(1) Adhesion between protective coating and substrate and metal layer
After a sample surface with a metal grid pattern is coated and prepared with the protective coating dry film with the thickness of 2 micrometers, the adhesion between the protective coating and a substrate area and an all-copper-plated area is tested by a check method, and the method comprises the following specific steps: and (3) transversely and vertically cutting the specified area by using a check knife, adhering by using a 3M 610 type adhesive tape, tearing off the air bubbles within 1-2s after removing the air bubbles, observing and testing the falling condition of the coating of the check area, and judging that 5B is passed if the coating does not fall. The results are shown in table 1 below.
(2) Adhesion between protective coating and OCA glue
Preparing the protective coating on the front surface and the back surface of the metal grid conductive film, taking two conductive films with the protective coating, gluing the conductive films together through OCA glue, testing the tensile value of the two glued metal grid conductive films when the two metal grid conductive films are separated by using a tensiometer, and passing the test when the tensile value is larger than 1800 gf/inch. The results are shown in table 1 below.
(3) Pull-out force between protective coating and FPC
After the preparation of the protective coating is completed on the upper surface and the lower surface of the metal grid conductive film, hot-pressing and binding the FPC and the chain interface on the metal conductive film through ACF glue, performing destructive testing by using a tension meter after the binding is completed, defining the force displayed on the tension meter as the drawing force when the FPC falls off from the metal grid conductive film, and passing the testing when the drawing force is more than 500 g/cm. The results are shown in table 1 below.
Test example 3 Hot melt test
After the metal conductive film coated with the protective coating is prepared, ACF glue is used for binding under the conditions that the heating temperature is less than or equal to 150 ℃ and the heating time is less than or equal to 15s, and the FPC and the metal conductive wire are linked. And if the test resistance value of the obtained sample reaches the standard, judging that the coating formula can be pierced by the hot melting of the gold conductive particles in the ACF.
Test example 4 weather resistance test
After the metal grid sensor assembly of two-sided coating protective coating is TP touch-control module, weatherproof reliability test is carried out, and the test item includes: high temperature and high humidity (85 ℃,85% humidity 240h, 60 ℃,90% humidity 240 h), cold and hot impact (low temperature-40 ℃ (20 min) -high temperature 65 ℃ (20 min); 100 cycles), UV aging (UVA 340 lamp for UV test; 0.77W/(m) W/(m) W340 lamp for UV test; 0.77W/(m) W2/m 2 Nm)), salt spray test (35 ℃, sodium chloride 5%, pH 6.5-7.2, 96 h), high/low temperature storage (85 ℃/— 40 ℃: 240h) If the electrical test is passed before and after the weather resistance test, the weather resistance test is passed. The results are shown in table 1 below.
TABLE 1
As can be seen from the results in Table 1, the thermoplastic type weather-resistant protective coating materials of examples 1 to 3 prepared by the formulation of the present invention passed the solvent resistance, adhesion, hot-melt property and weather resistance tests as compared with the comparative example. That is, the thermoplastic weather-resistant protective coating material of the present invention can simultaneously satisfy the requirements of achieving device lightness and thinness, solvent resistance, hot melt property, weather resistance, etc., and thus has excellent performance when applied to a metal mesh touch sensor.
Further, in the tightening weather resistance test, particularly, the weather resistance was confirmed by using the test result of boiling in water at 100 ℃ for 1 hour, the film surface of the weather-resistant coating of example 3 was not whitened, and the film surface of the weather-resistant coating obtained in examples 1-2 began to whiten. That is, in the case where the isocyanate-based curing agent was added to the weather-resistant coating layer of example 3, the weather-resistant property of the coating layer was further enhanced.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (7)
1. A thermoplastic type weather-resistant protective coating material, characterized in that it comprises the following components:
(A) 10-30wt% of a resin which is a combination of a methyl methacrylate/ethyl acrylate copolymer and a polyurethane modified acrylic resin in a mass ratio of 90%/10% to 10%/90% and which is selected from the DOW Paraloid series of resins having a molecular weight of 140000Da, the polyurethane modified acrylic resin being selected from the T8-1 or T46 resins of shanghan femora;
(B) 0.1-2wt% of leveling agent;
(C) 5-20wt% of an adhesion promoter, wherein the adhesion promoter is selected from acetylacetone; and
(D) Enough organic solvent is supplemented.
2. The thermoplastic weathering protection coating material of claim 1 wherein the leveling agent is selected from one or more of modified silicones, acrylates, and fluorine containing leveling agents.
3. The thermoplastic weathering protection coating material of claim 2 wherein the modified silicone based leveling agent is selected from one or more of BYK333 and BYK 3550; the acrylate leveling agent is selected from one or more of BYK3560 and BYK 3565; the fluorine-containing leveling agent is selected from one or more of DuPont FS31 and DuPont FS 3100.
4. The thermoplastic weathering protection coating material of claim 1 wherein the organic solvent is selected from one or more of ethyl lactate, butyl acetate, ethyl acetate, and ethyl propionate.
5. The thermoplastic weathering protection coating material according to claim 1 further comprising 5-10wt% of an isocyanate based curing agent that is a K200T series curing agent of Shanghai Hanfei.
6. A method of making the thermoplastic, weatherproof protective coating material of any of claims 1-5, comprising: the resin, the leveling agent, the adhesion promoter and the organic solvent are contacted in a predetermined ratio, and optionally the curing agent.
7. Use of the thermoplastic weathering protection coating material according to any of claims 1-5 for metal mesh touch sensors.
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