A coating composition for forming a flexible insulating coating having a high dielectric constant

Abstract

This invention discloses an improved coating composition for manufacturing a dielectric layer required within the antenna of a radio frequency identification (RFID) tag, which can be applied by spraying, printing, or any other suitable patterning technique. The composition essentially consists of: a dielectric material, such as barium titanate (BaTiO3), with a particle size of 48-500 nm, at 10.00-40.00% w / w; polyvinylpyrrolidone (PVP) as a polymeric dispersant and polyvinyl alcohol (PVOH) as a polymeric binder, each at 1.00-10.00% w / w; a water-miscible solvent, such as isopropanol, at 30.00-55.00% w / w; and deionized water up to 100% w / w. The composition of this invention is used to form a flexible insulating coating in the manufacture of RFID tags.

Description

Technical Field

[0001] This invention relates to a novel coating composition for preparing a flexible insulating coating for use in radio frequency identification (RFID) antennas, its preparation method, and its applications.

[0002] Technical problems to be solved The technical problem to be solved by this invention relates to the preparation of a highly efficient flexible insulating coating for the manufacture of RFID tag antennas. If this insulating coating is highly efficient, it can significantly improve the performance of RFID tag antennas in terms of frequency bandwidth, multi-band capability, gain, and half-power bandwidth.

[0003] Furthermore, the technical problem to be solved by this invention also relates to coatings that are currently widely used and made of toxic and environmentally harmful chemicals. Background Technology

[0004] The rapid development of electronic devices largely relies on the high-throughput production of high-performance dielectric materials and inexpensive electronic components. Radio frequency identification (RFID) antennas are one such example, widely used in mobile phone antennas, drone antennas, Internet of Things (IoT) device antennas, home appliances, the automotive industry, logistics, aerospace, biomedicine, mining, and many other fields. The design of modern RF antenna devices requires comprehensive consideration of material parameters, geometric parameters, and manufacturing process parameters. The antenna design and the performance of the polymer matrix composite (PMC) (including the type and properties of the dielectric material used) significantly affect its final performance, such as gain, bandwidth, impedance matching, thermal performance, and operating frequency. See references 1-3 for details. 1) C. Varadhan, FA Chamatu, S. Arulselvi: A review of characterization of composite RFID antennas based on thermal properties, Progress in Materials Science and Engineering (2021), 8905489; 2) AA Babar, VA Bhagavati, L. Ukkonen, AZ Elsherbeni, P. Kallio, L. Sydänheimo: Performance of high dielectric constant ceramic-polymer composites as UHF RFID tag antenna substrates, *International Journal of Antennas and Propagation* (2012), 905409; and 3) Q.-Y. Tang, Y.-M. Pan, YC Chan, KW Leung: Frequency-tunable flexible composite antenna for wireless sensing, Sensors and Actuators A: Physics, Vol. 179 (2012), pp. 137-145.

[0005] Various ceramic materials are among the most important dielectric materials, such as barium titanate (BaTiO3), barium strontium titanate, and strontium titanate (SrTiO3). See references 2 and 4. 4) L. Zhou, Y. Jiang, D. Chu: Synthesis and dielectric properties of printable strontium titanate / polyvinylpyrrolidone nanocomposites, Materials Research Letters, Vol. 6 (2019), 0950c6.

[0006] Currently, various polymeric materials are used to manufacture RFID antennas, including polydimethylsiloxane (PDMS), polyvinylidene fluoride (PVDF), polymethyl methacrylate (PMMA), polyvinylpyrrolidone (PVP), and other polymers with low dielectric loss. See references 4 and 5. 5) H. Deng, Y. Wei, H. Jing, R. Zhang, Q. Chen, J. Wang, Z. Qu, J. Duan, B. Zhang: Flexible ultrawideband cartoon-shaped antenna based on composite materials with customizable dielectric properties, Smart Materials and Structures, Vol. 31 (2022), 095016.

[0007] RFID tag antennas can be manufactured using various patterning techniques, such as inkjet printing, spraying, stencil printing, or screen printing. Furthermore, the mainstream mass production processes for RFID tag antennas are roll-to-roll (R2R), sheet-to-sheet (S2S), and hybrid methods. The specific approach depends on the thickness and concentration of the dielectric layer being coated. Mass production processes can utilize elastic composite materials or liquid binders doped with particles of high dielectric constant and high permeability. For example, elastomers or other thermoplastic polymers doped with nanoparticles or microparticles of high relative dielectric constant and high relative permeability. These antennas are typically monopole antennas, dipole antennas, inverted-F antennas (IFA), planar inverted-F antennas (PIFA), patch antennas, log-periodic antennas, whip antennas, slot antennas, microstrip antennas, helical antennas, and ceramic chip antennas. When combined with dielectric materials, these antennas offer multi-band frequencies and higher gain compared to other electrically small antennas. The aforementioned common techniques for manufacturing RFID antennas are well-known in the art; see, for example, reference 6. 6) CL Baumbauer, MG Anderson, J. Ting, A. Sreekumar, JM Rabaey, AC Arias, A. Thielens: Printed flexible compact UHF-RFID sensor tags based on hybrid electronics, Scientific Reports, Vol. 10 (2020), 16543.

[0008] This invention solves the technical problem of manufacturing high-efficiency flexible RFID tag antennas by using a novel coating composition for preparing flexible insulating coatings as described below. The antennas exhibit excellent performance in key parameters, such as wider frequency bandwidth, multi-band operation, higher gain, and wider half-power bandwidth. Summary of the Invention

[0009] This invention discloses a novel coating composition for forming a flexible insulating coating with a high dielectric constant, comprising: (i) Dielectric material, selected from the group consisting of barium titanate (BaTiO3), strontium titanate (SrTiO3), and calcium copper titanate (CaCu3Ti4O3). 12 Cobalt oxide (CoO), cobalt tetroxide (Co3O4), titanium dioxide (TiO2), aluminum oxide (Al2O3), lanthanum oxide (La2O3), conjugated polymers (CP), or mixtures thereof, with a particle size of 48-500 nm and a w / w ratio of 10.00-40.00%; (ii) Polymer dispersant, 1.00-10.00% w / w; (iii) Polymer adhesives, 1.00-10.00% w / w; (iv) Water-miscible organic solvents, 30.00-55.00% w / w; (v) Optionally, one or more auxiliary components, used to impart specific technical properties to the resulting composition when applied by spraying or printing, such as surfactants, wetting agents, plasticizers, defoamers, corrosion inhibitors, and antioxidants, 0.00-2.00% w / w; and (vi) Deionized water, up to 100.00% of the composition. In the aforementioned formula, - Polyvinylpyrrolidone (PVP) is used as a polymeric dispersant; Polyvinyl alcohol (PVOH) is used as a polymeric adhesive; and - The water-miscible solvent is selected from the group consisting of isopropanol, n-propanol, or a mixture of isopropanol and n-propanol in any weight ratio with low molecular weight fatty alcohols (ROH), such as methanol, ethanol, n-butanol, isobutanol, sec-butanol, tert-butanol, and the relative proportions of the mixture are: Isopropanol and / or n-propanol:ROH = 1:3 - 3:1, w / w.

[0010] In specific embodiments of the invention, the conjugated polymer (CP) is selected from the group consisting of: polyaniline (PANI), poly(p-phenylene) (PPP), poly(p-phenylene vinylene) (PPV), poly[2,5-di(alkoxy)-p-phenylene vinylene], polyacetylene (PAC), polyheptandyne (PHT), polythiophene (PTH), poly(3-alkylthiophene) (P3AT) (e.g., poly(3-hexylthiophene) (P3HT)), polypyrrole (PPy), ladder poly(p-phenylene) (LPPP), or mixtures of these polymers.

[0011] In a preferred embodiment of the invention, the polyvinylpyrrolidone (PVP) used as a polymeric dispersant is selected from those with a relative molecular mass (M). r The product grade is 2000-1200000, with M being the preferred option. r The value is 44000-54000 and the average M is... r The PVP is 40,000.

[0012] In a further preferred embodiment of the invention, the polyvinyl alcohol (PVOH) used as the polymeric adhesive is selected from those with a relative molecular mass (M). r The product grade is 10,000-500,000 with a degree of hydrolysis of 85.0-100%, of which M is preferred. r The PVOH is 30,000-200,000.

[0013] In a particularly preferred embodiment of the present invention, the water-miscible solvent is isopropanol.

[0014] In a further preferred embodiment of the invention, the composition comprises the following components by weight percentage: (i) 15.00-30.00% w / w; (ii) 2.00-6.00% w / w; (iii) 2.00-6.00 w / w (iv) 35.00-50.00% w / w; (v) Optional, sodium dodecyl sulfate, 0.00-0.10% w / w; and (vi) 25.00-40.00% w / w.

[0015] Furthermore, in a particularly preferred embodiment of the invention, the composition comprises the following components by weight percentage: (i) 15.00-30.00% w / w; (ii) 3.50-4.50% w / w; (iii) 3.50-4.50 w / w (iv) 38.00-45.00% w / w; (v) Sodium dodecyl sulfate, 0.05-0.10% w / w; and (vi) 30.00-35.00% w / w.

[0016] Optionally, the coating composition of the present invention comprises a surfactant with a hydrophilic-lipophilic balance (HLB) value of 13-40, wherein the surfactant is selected from the group consisting of: - Anionic surfactants and other surfactants, such as sodium stearate, sodium lauryl sulfate, sodium lauryl ether sulfate or potassium cetyl phosphate; - Nonionic surfactants, such as polyoxyethylene (20) stearate, sorbitan monooleate, cocoyl glucoside, or cocodiethanolamide; amphoteric surfactants, such as cocamidopropyl betaine; or - Cationic surfactants, such as benzalkonium chloride or stearyltrimethylammonium chloride; Or a mixture of these substances.

[0017] In a further optional embodiment of the invention, the coating composition comprises a wetting agent with a hydrophilic-lipophilic balance (HLB) value of 7-13, the wetting agent being selected from the group consisting of: - Alkoxylated linear saturated or unsaturated fatty alcohols containing C8-C18 carbon atoms and embedded with 2-8 ethylene oxide (EO) units, such as polyoxyethylene (4) lauryl ether; - Ammonium or alkali metal sulfosuccinates, such as sodium bis(2-ethylhexyl)sulfosuccinate; Or a mixture of these substances.

[0018] Optionally, the coating composition of the present invention includes a plasticizer selected from the group consisting of epoxidized soybean oil (ESBO), epoxidized linseed oil (ELO), 3-hydroxy-2,2,4-trimethylpentyl isobutyrate, sebacate (e.g., dioctyl sebacate), diisononyl 1,2-cyclohexanedicarboxylate, bis(butylcarbitol) formaldehyde, or mixtures thereof.

[0019] In a further optional embodiment of the invention, the coating composition includes an antifoaming agent selected from the group consisting of silicone oil (e.g., polydimethylsiloxane), C6-C22 higher fatty alcohols, mineral oil, or mixtures thereof.

[0020] Optionally, the coating composition of the present invention includes a corrosion inhibitor selected from the group consisting of: - Inorganic salts, such as sodium silicate or potassium silicate, sodium borate or potassium borate or tetraborate, tripotassium phosphate or trisodium phosphate, potassium nitrite or sodium nitrite; - Mercaptobenzothiazole (MBT); - Primary, secondary or tertiary amines, diamines or triamines composed of C2-C8 alkyl groups, such as n-butylamine, diisopropylamine, triethylamine, ethylenediamine or diallyltriamine (DPTA). - Primary, secondary, and tertiary hydroxyalkylamines or alkoxyalkylamines, such as ethanolamine, methyldiethanolamine, and 3-methoxypropylamine; - Cyclic amines, such as morpholine, piperazine, or their alkyl monoalkyl or dialkyl derivatives containing 1-6 carbon atoms, such as N-methylmorpholine or 1,4-dimethylpiperazine; Or a salt formed by the above-mentioned amine and a weak acid, such as acetic acid, benzoic acid, citric acid, 4-oxo-4-(p-tolyl)butyric acid, or a mixture of these substances.

[0021] In a further optional embodiment of the invention, the coating composition comprises one or more antioxidants selected from the group consisting of 2,6-di-tert-butyl-4-methylphenol (BHT), butylated hydroxyanisole (BHA), 2,4-dimethyl-6-tert-butylphenol, and N,N'-di(2-butyl)-1,4-phenylenediamine, and contains or does not contain one or more auxiliary antioxidants, such as disodium ethylenediaminetetraacetate dihydrate (Na2EDTA·2H2O), trisodium citrate dihydrate (Na3C6H5O7·2H2O), or sodium phytate (Na2C6H5O7·2H2O). 12 C6H6(OPO3)6).

[0022] The preparation method of the coating composition of the present invention includes the following preparation steps: A. The polymeric dispersant, polymeric binder, and one or more optional auxiliary components are homogenized in deionized water under the following conditions: stirring at 25-500 rpm for 10-60 minutes at 10-80°C, preferably 15-40°C, and preferably simultaneously subjected to ultrasonic (US) irradiation at 200 kHz-1 MHz, wherein the US irradiation power is 50-200 W / 1000 mL of the mixture; B. Specifically, the powdered dielectric material is homogenized in one or more water-miscible organic solvents under the following conditions: stirring at 25-500 rpm for 10-60 minutes at 10-80°C, preferably 15-40°C, and preferably simultaneously subjected to ultrasonic (US) irradiation at 200 kHz-1 MHz, wherein the US irradiation power is 50-200 W / 1000 mL of the mixture; C. Mix the materials obtained from stage A and stage B, and homogenize the mixture under the following conditions: stirring at 25-500 rpm for 10-60 minutes at 10-80°C, preferably 15-40°C; preferably, simultaneously applying ultrasonic (US) irradiation at 200 kHz-1 MHz, wherein the US irradiation power is 50-200 W / 1000 mL of the resulting mixture. The composition is thus prepared in the form of a viscous liquid suspension.

[0023] The coating composition of the present invention is used to form a flexible coating with a high dielectric constant by spraying or screen printing. Specifically, the coating composition of the present invention is used in RFID manufacturing, wherein the coating is used for impedance matching and serves as a dielectric resonator for the antenna, thereby improving the performance of the RFID antenna. Detailed Implementation

[0024] This invention discloses a novel coating composition for forming a flexible insulating coating with a high dielectric constant, comprising: (i) Dielectric material, selected from the group consisting of barium titanate (BaTiO3), strontium titanate (SrTiO3), and calcium copper titanate (CaCu3Ti4O3). 12 Cobalt oxide (CoO), cobalt tetroxide (Co3O4), titanium dioxide (TiO2), aluminum oxide (Al2O3), lanthanum oxide (La2O3), conjugated polymers (CP), or mixtures thereof, with a particle size of 48-500 nm and a w / w ratio of 10.00-40.00%; (ii) Polymer dispersant, 1.00-10.00% w / w; (iii) Polymer adhesives, 1.00-10.00% w / w; (iv) Water-miscible organic solvents, 30.00-55.00% w / w; (v) Optionally, one or more auxiliary components, used to impart specific technical properties to the resulting composition when applied by spraying or printing, such as surfactants, wetting agents, plasticizers, defoamers, corrosion inhibitors, and antioxidants, 0.00-2.00% w / w; and (vi) Deionized water, up to 100.00% of the composition. In the aforementioned formula, - Polyvinylpyrrolidone (PVP) is used as a polymeric dispersant; Polyvinyl alcohol (PVOH) is used as a polymeric adhesive; and - The water-miscible solvent is selected from the group consisting of isopropanol, n-propanol, or a mixture of isopropanol and n-propanol in any weight ratio with low molecular weight fatty alcohols (ROH), such as methanol, ethanol, n-butanol, isobutanol, sec-butanol, tert-butanol, and the relative proportions of the mixture are: Isopropanol and / or n-propanol:ROH = 1:3 - 3:1, w / w.

[0025] In specific embodiments of the invention, the conjugated polymer (CP) is selected from the group consisting of: polyaniline (PANI), poly(p-phenylene) (PPP), poly(p-phenylene vinylene) (PPV), poly[2,5-di(alkoxy)-p-phenylene vinylene], polyacetylene (PAC), polyheptandyne (PHT), polythiophene (PTH), poly(3-alkylthiophene) (P3AT) (e.g., poly(3-hexylthiophene) (P3HT)), polypyrrole (PPy), ladder poly(p-phenylene) (LPPP), or mixtures of these polymers.

[0026] In a preferred embodiment of the invention, the polyvinylpyrrolidone (PVP) used as a polymeric dispersant is selected from those with a relative molecular mass (M). r The product grade is 2000-1200000, with M being the preferred option. r The value is 44000-54000 and the average M is... r The PVP is 40,000.

[0027] In a further preferred embodiment of the invention, the polyvinyl alcohol (PVOH) used as the polymeric adhesive is selected from those with a relative molecular mass (M). r The product grade is 10,000-500,000 with a degree of hydrolysis of 85.0-100%, of which M is preferred. r The PVOH is 30,000-200,000.

[0028] In a particularly preferred embodiment of the present invention, the water-miscible solvent is isopropanol.

[0029] In a further preferred embodiment of the invention, the composition comprises the following components by weight percentage: (i) 15.00-30.00% w / w; (ii) 2.00-6.00% w / w; (iii) 2.00-6.00 w / w (iv) 35.00-50.00% w / w; (v) Optional, sodium dodecyl sulfate, 0.00-0.10% w / w; and (vi) 25.00-40.00% w / w.

[0030] Furthermore, in a particularly preferred embodiment of the invention, the composition comprises the following components by weight percentage: (i) 15.00-30.00% w / w; (ii) 3.50-4.50% w / w; (iii) 3.50-4.50 w / w (iv) 38.00-45.00% w / w; (v) Sodium dodecyl sulfate, 0.05-0.10% w / w; and (vi) 30.00-35.00% w / w.

[0031] Optionally, the coating composition of the present invention comprises a surfactant with a hydrophilic-lipophilic balance (HLB) value of 13-40, wherein the surfactant is selected from the group consisting of: - Anionic surfactants and other surfactants, such as sodium stearate, sodium lauryl sulfate, sodium lauryl ether sulfate or potassium cetyl phosphate; - Nonionic surfactants, such as polyoxyethylene (20) stearate, sorbitan monooleate, cocoyl glucoside, or cocodiethanolamide; amphoteric surfactants, such as cocamidopropyl betaine; or - Cationic surfactants, such as benzalkonium chloride or stearyltrimethylammonium chloride; Or a mixture of these substances.

[0032] In a further optional embodiment of the invention, the coating composition comprises a wetting agent with a hydrophilic-lipophilic balance (HLB) value of 7-13, the wetting agent being selected from the group consisting of: - Alkoxylated linear saturated or unsaturated fatty alcohols containing C8-C18 carbon atoms and embedded with 2-8 ethylene oxide (EO) units, such as polyoxyethylene (4) lauryl ether; - Ammonium or alkali metal sulfosuccinates, such as sodium bis(2-ethylhexyl)sulfosuccinate; Or a mixture of these substances.

[0033] Optionally, the coating composition of the present invention includes a plasticizer selected from the group consisting of epoxidized soybean oil (ESBO), epoxidized linseed oil (ELO), 3-hydroxy-2,2,4-trimethylpentyl isobutyrate, sebacate (e.g., dioctyl sebacate), diisononyl 1,2-cyclohexanedicarboxylate, bis(butylcarbitol) formaldehyde, or mixtures thereof.

[0034] In a further optional embodiment of the invention, the coating composition includes an antifoaming agent selected from the group consisting of silicone oil (e.g., polydimethylsiloxane), C6-C22 higher fatty alcohols, mineral oil, or mixtures thereof.

[0035] Optionally, the coating composition of the present invention includes a corrosion inhibitor selected from the group consisting of: - Inorganic salts, such as sodium silicate or potassium silicate, sodium borate or potassium borate or tetraborate, tripotassium phosphate or trisodium phosphate, potassium nitrite or sodium nitrite; - Mercaptobenzothiazole (MBT); - Primary, secondary or tertiary amines, diamines or triamines composed of C2-C8 alkyl groups, such as n-butylamine, diisopropylamine, triethylamine, ethylenediamine or diallyltriamine (DPTA). - Primary, secondary, and tertiary hydroxyalkylamines or alkoxyalkylamines, such as ethanolamine, methyldiethanolamine, and 3-methoxypropylamine; - Cyclic amines, such as morpholine, piperazine, or their alkyl monoalkyl or dialkyl derivatives containing 1-6 carbon atoms, such as N-methylmorpholine or 1,4-dimethylpiperazine; Or a salt formed by the above-mentioned amine and a weak acid, such as acetic acid, benzoic acid, citric acid, 4-oxo-4-(p-tolyl)butyric acid, or a mixture of these substances.

[0036] In a further optional embodiment of the invention, the coating composition comprises one or more antioxidants selected from the group consisting of 2,6-di-tert-butyl-4-methylphenol (BHT), butylated hydroxyanisole (BHA), 2,4-dimethyl-6-tert-butylphenol, and N,N'-di(2-butyl)-1,4-phenylenediamine, and contains or does not contain one or more auxiliary antioxidants, such as disodium ethylenediaminetetraacetate dihydrate (Na2EDTA·2H2O), trisodium citrate dihydrate (Na3C6H5O7·2H2O), or sodium phytate (Na2C6H5O7·2H2O). 12 C6H6(OPO3)6).

[0037] Method for preparing coating composition of the present invention The preparation method of the coating composition of the present invention includes the following preparation steps: A. The polymeric dispersant, polymeric binder, and one or more optional auxiliary components are homogenized in deionized water under the following conditions: stirring at 25-500 rpm for 10-60 minutes at 10-80°C, preferably 15-40°C, and preferably simultaneously subjected to ultrasonic (US) irradiation at 200 kHz-1 MHz, wherein the US irradiation power is 50-200 W / 1000 mL of the mixture; B. Specifically, the powdered dielectric material is homogenized in one or more water-miscible organic solvents under the following conditions: stirring at 25-500 rpm for 10-60 minutes at 10-80°C, preferably 15-40°C, and preferably simultaneously subjected to ultrasonic (US) irradiation at 200 kHz-1 MHz, wherein the US irradiation power is 50-200 W / 1000 mL of the mixture; C. Mix the materials obtained from stage A and stage B, and homogenize the mixture under the following conditions: stirring at 25-500 rpm for 10-60 minutes at 10-80°C, preferably 15-40°C; preferably, simultaneously applying ultrasonic (US) irradiation at 200 kHz-1 MHz, wherein the US irradiation power is 50-200 W / 1000 mL of the resulting mixture. The composition is thus prepared in the form of a viscous liquid suspension.

[0038] Typical experimental steps for preparing the coating compositions of the present invention are disclosed in Examples 1-6.

[0039] Uses of the coating composition of the present invention The coating composition of the present invention is used to form a flexible coating with a high dielectric constant by spraying or screen printing.

[0040] Specifically, the coating composition of the present invention is used in RFID manufacturing, wherein the coating is used for impedance matching and serves as a dielectric resonator for the antenna, thereby improving the performance of the RFID antenna.

[0041] The coating composition of this invention provides a flexible insulating coating for RFID tag antennas. The effects of the flexible coating obtained by the composition include: extremely high dielectric constant and permeability, wider frequency bandwidth, multi-band capability, higher gain, and greater half-power bandwidth. It can improve read distance on lossy materials, enhance sensitivity, increase read angle, be used for impedance matching, and selectively reduce the electrical size of the tag. It can also be coated on other antennas in various industries. The mobile device, Internet of Things (IoT), and UAV industries use planar inverted-F antennas (PIFA), helical antennas, dipole antennas, and other types of antennas.

[0042] In real-world measurements of attaching high-dielectric-constant films to various RFID tags, signal gain was significantly improved by 25 dB to 30 dB. For long-life wireless edge devices, this translates to a thousand-fold reduction in communication power consumption, while simultaneously enhancing device performance.

[0043] Example General instructions The term "room temperature" refers to a temperature range of 20-25°C. Stirring speed is expressed as revolutions per minute (rpm) of the stirring element.

[0044] In the dynamic viscosity (η) measurement, a parallel plate geometry was used with a plate gap of 0.2 mm. Parameter settings: ID2: set temperature 25°C, t = 20.00 s; ID3: rotation step; CR; y0.01000 1 / s - 1.000×10 4 1 / s, logarithmic scan; t < 520.00 s; 40 steps; T = 25°C.

[0045] Example 1. Preparation method of the coating composition of the present invention Composition (1000 g coating composition): (1) 30.00% (300.00 g) deionized water; a (2) 5.00% (50.00 g) polymeric dispersant: polyvinylpyrrolidone (PVP) of model Kollidon 30 (M r = 44000-54000); b (3) 5.00% (50.00 g) polymeric adhesive: Vivapharm PVA 05 fine powder polyvinyl alcohol (PVOH); degree of hydrolysis: 85-89 mol% c (4) 30.00% (300.00 g) water-miscible solvent: isopropanol; d as well as (5) 30.00% (300.00 g) powdered dielectric material: barium titanate (BaTiO3; crystal morphology: tetragonal; purity: ≥99.95%; average particle size: 370 nm). e Total: 100.00% (1000.00 g) Preparation method: A. The polymeric dispersant (2) and polymeric binder (3) are homogenized in deionized water (1) under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with ultrasonic waves (US) at 200 kHz, wherein the US irradiation power is 50 W / L of the mixture.

[0046] B. The powdered dielectric material (5) and the water-miscible organic solvent (4) were homogenized separately under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with US at 200 kHz, wherein the US irradiation power was 50 W / L of the mixture.

[0047] C. Mix the materials obtained from stage A and stage B and homogenize them. The treatment conditions are: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while applying 200 kHz US irradiation with a US irradiation power of 50 W / L to obtain the mixture. The mixture was then stirred and cooled to room temperature to obtain the composition, which was a white, viscous liquid suspension with a slightly characteristic odor similar to isopropanol. The final product was then filled into suitable metal or plastic containers.

[0048] Starting materials: a Products of KG Zelina, a Croatian company; b Products from BASF AG, Germany; c Products of JRSPharma GmbH & Co. KG, Germany; d Products from the Italian company Carlo Erba Reagents srl; e Products from the Turkish company Nanografi Nanotechnology.

[0049] Example 2. Preparation method of the coating composition of the present invention Composition (1000 g coating composition): (1) 25.00% (250.00 g) deionized water; a (2) 4.00% (40.00 g) polymeric dispersant: polyvinylpyrrolidone (PVP) of model Kollidon 30 (M r = 44000-54000); b (3) 6.00% (60.00 g) polymeric adhesive: Vivapharm PVA 05 fine powder polyvinyl alcohol (PVOH); degree of hydrolysis: 85-89 mol% c (4) 30.00% (300.00 g) water-miscible solvent: isopropanol; d as well as (5) 35.00% (350.00 g) powdered dielectric material: barium titanate [calcium copper titanate, CaTiO3·3CuTiO3; purity: ≥99.5%; average particle size, D 50 = 360 nm). e Total: 100.00% (1000.00 g) Preparation method: A. The polymeric dispersant (2) and polymeric binder (3) are homogenized in deionized water (1) under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 75-80°C, while being irradiated with ultrasonic waves (US) at 200 kHz, wherein the US irradiation power is 50 W / L of the mixture.

[0050] B. The powdered dielectric material (5) and the water-miscible organic solvent (4) were homogenized separately under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 75-80°C, while being irradiated with US at 200 kHz, wherein the US irradiation power was 50 W / L of the mixture.

[0051] C. Mix the materials obtained from stage A and stage B and homogenize them. The treatment conditions are: stirring at 100-150 rpm for 15-20 minutes at 75-80°C, while applying 200 kHz US irradiation with a US irradiation power of 50 W / L to obtain the mixture. The mixture was then stirred and cooled to room temperature to obtain the composition, which was a white, viscous liquid suspension with a slightly characteristic odor similar to isopropanol. The final product was then filled into suitable metal or plastic containers.

[0052] Starting materials: a Products of KG Zelina, a Croatian company; b Products from BASF AG, Germany; c Products of JRSPharma GmbH & Co. KG, Germany; d Products from the Italian company Carlo Erba Reagents srl; e Products from the Turkish company Nanografi Nanotechnology.

[0053] Example 3. Preparation method of the coating composition of the present invention Composition (1000 g coating composition): (1) 30.00% (300.00 g) deionized water; a (2) 8.00% (80.00 g) polymeric dispersant: polyvinylpyrrolidone (PVP) of model Kollidon 30 (M r = 44000-54000); b (3) 7.00% (70.00 g) polymeric adhesive: Vivapharm PVA 05 fine powder polyvinyl alcohol (PVOH); degree of hydrolysis: 85-89 mol% c (4) 25.00% (250.00 g) water-miscible solvent: isopropanol; d (5) 20.00% (200.00 g) water-miscible solvent: n-propanol; d as well as (6) 10.00% (100.00 g) powdered dielectric material: Cobalt tetroxide (Co3O4; purity: ≥99.77%; average particle size: 48 nm). e Total: 100.00% (1000.00 g) Preparation method: A. The polymeric dispersant (2) and polymeric binder (3) were homogenized in deionized water (1) under the following conditions: stirring at 450-500 rpm for 20-30 minutes at room temperature, while being irradiated with 1 MHz ultrasound (US) with a US irradiation power of 200 W / L.

[0054] B. The powdered dielectric material (6) was homogenized with water-miscible organic solvents (4) and (5) respectively. The treatment conditions were: stirring at 450-500 rpm for 20-30 minutes at room temperature, while applying 1 MHz US irradiation, wherein the US irradiation power was 200 W / L of the mixture.

[0055] C. Mix the materials obtained from stage A and stage B and homogenize them. The processing conditions are: stirring at 450-500 rpm for 20-30 minutes at room temperature, while applying 1 MHz US irradiation with a US irradiation power of 200 W / L to obtain the mixture. The resulting composition is a white, viscous liquid suspension with a slightly characteristic odor similar to isopropanol and n-propanol. The final product is then filled into suitable metal or plastic containers.

[0056] Starting materials: a Products of KG Zelina, a Croatian company;b Products from BASF AG, Germany; c Products of JRSPharma GmbH & Co. KG, Germany; d Products from the Italian company Carlo Erba Reagents srl; e Products from the Turkish company Nanografi Nanotechnology.

[0057] Example 4. Preparation method of the coating composition of the present invention Composition (1000 g coating composition): (1) 26.00% (260.00 g) deionized water; a (2) 1.00% (10.00 g) polymeric dispersant: polyvinylpyrrolidone (PVP) of model Kollidon 90 (M r = 900000-1200000); b (3) 10.00% (100.00 g) polymeric adhesive: Vivapharm PVA 05 fine powder polyvinyl alcohol (PVOH); degree of hydrolysis: 85-89 mol% c (4) 15.00% (150.00 g) water-miscible solvent: isopropanol; d (5) 10.00% (100.00 g) water-miscible solvent: n-propanol; d (6) 5.00% (50.00 g) water-miscible solvent: n-Butanol; d as well as (7) 33.00% (330.00 g) powdered dielectric material: barium titanate (BaTiO3; crystal morphology: tetragonal; purity: ≥99.95%; average particle size: 370 nm). e Total: 100.00% (1000.00 g) Preparation method: A. The polymeric dispersant (2) and polymeric binder (3) are homogenized in deionized water (1) under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with ultrasonic waves (US) at 200 kHz, wherein the US irradiation power is 50 W / L of the mixture.

[0058] B. The powdered dielectric material (7) was homogenized with water-miscible organic solvents (4), (5) and (6) respectively. The treatment conditions were: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with US at 200 kHz, wherein the US irradiation power was 50 W / L of the mixture.

[0059] C. Mix the materials obtained from stage A and stage B and homogenize them. The treatment conditions are: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while applying 200 kHz US irradiation with a US irradiation power of 50 W / L to obtain the mixture. The mixture was then stirred and cooled to room temperature to obtain the composition, which was a white, viscous liquid suspension with a slightly characteristic odor similar to isopropanol and n-butanol. The final product was then filled into suitable metal or plastic containers.

[0060] Starting materials: a Products of KG Zelina, a Croatian company; b Products from BASF AG, Germany; c Products of JRSPharma GmbH & Co. KG, Germany; d Products from the Italian company Carlo Erba Reagents srl; e Products from the Turkish company Nanografi Nanotechnology.

[0061] Example 5. Method for preparing the coating composition of the present invention Composition (1000 g coating composition): (1) 22.65% (226.50 g) deionized water; a (2) 0.35% (3.50 g) surfactant: sodium dodecyl sulfate, model Texapon LS 30; b (3) 3.00% (30.00 g) polymeric dispersant: polyvinylpyrrolidone (PVP) of model Kollidon 30 (M r =44000-54000); b (4) 4.00% (40.00 g) polymeric adhesive: polyvinyl alcohol (PVOH) of model Selvol PVOH 504; degree of hydrolysis: 87.0-89.0 mol% c (5) 35.00% (350.00 g) water-miscible solvent: isopropanol; d as well as (6) 35.00% (350.00 g) powdered dielectric material: barium titanate (BaTiO3; crystal morphology: tetragonal; purity: ≥99.95%; average particle size: 370 nm). e Total: 100.00% (1000.00 g) Preparation method: A. The surfactant (2), polymeric dispersant (3) and polymeric binder (4) are homogenized in deionized water (1) under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with 200 kHz ultrasonic (US) radiation, wherein the US irradiation power is 50 W / L of the mixture.

[0062] B. The powdered dielectric material (6) and the water-miscible organic solvent (5) were homogenized separately under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with US at 200 kHz, wherein the US irradiation power was 50 W / L of the mixture.

[0063] C. Mix the materials obtained from stage A and stage B and homogenize them. The treatment conditions are: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while applying 200 kHz US irradiation with a US irradiation power of 50 W / L to obtain the mixture. The mixture was then stirred and cooled to room temperature to obtain the composition, which was a white, viscous liquid suspension with a slightly characteristic odor similar to isopropanol. The final product was then filled into suitable metal or plastic containers.

[0064] Starting materials: a Products of KG Zelina, a Croatian company; b Products from BASF AG, Germany; c Products from Sekisui Specialty Chemicals Europe SL, Spain; d Products from the Italian company Carlo Erba Reagentss.rl; e Products from the Turkish company Nanografi Nanotechnology.

[0065] Example 6. Preparation method of the coating composition of the present invention Composition (1000 g coating composition): (1) 27.07% (270.70 g) deionized water; a (2) 0.35% (3.50 g) surfactant: sodium dodecyl sulfate, model Texapon LS 30; b (3) 0.20% (2.00 g) wetting agent: sodium dioctyl sulfosuccinate, model number Hydropalat WE 3489; b (4) 3.00% (30.00 g) polymeric dispersant: polyvinylpyrrolidone (PVP) of model Kollidon 30 (M r =44000-54000); b (5) 4.00% (40.00 g) polymeric adhesive: polyvinyl alcohol (PVOH) of model Selvol PVOH 504; degree of hydrolysis: 87.0-89.0 mol% c (6) 35.00% (350.00 g) water-miscible solvent: isopropanol; d as well as (7) 0.25% (2.50 g) plasticizer: epoxidized soybean oil of type Efka PL 5381; b (8) 0.10% (1.00 g) defoamer: polysiloxane defoamer of model BYK-024; e (9) 0.02% (0.20 g) corrosion inhibitor: 2-mercaptobenzothiazole (2MBT); f (10) 0.01% (0.10 g) antioxidant: butylated hydroxytoluene (BHT; 2,6-di-tert-butyl-4-methylphenol); g (11) 30.00% (300.00 g) powdered dielectric material: barium titanate (BaTiO3; crystal morphology: tetragonal; purity: ≥99.95%; average particle size: 370 nm). h Total: 100.00% (1000.00 g) Preparation method: A. The surfactant (2), wetting agent (3), polymeric dispersant (4) and polymeric binder (5) are homogenized in deionized water (1) under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with 200 kHz ultrasonic (US) radiation, wherein the US irradiation power is 50 W / L of the mixture.

[0066] B. The powdered dielectric material (11) was homogenized with a water-miscible organic solvent (6), a plasticizer (7), an antifoaming agent (8), a corrosion inhibitor (9), and an antioxidant (10) under the following conditions: stirring at 100-150 r.pm at 45-50°C for 15-20 minutes, while being irradiated with US at 200 kHz, wherein the US irradiation power was 50 W / L of the mixture.

[0067] C. Mix the materials obtained from stage A and stage B and homogenize them. The treatment conditions are: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while applying 200 kHz US irradiation with a US irradiation power of 50 W / L to obtain the mixture. The mixture was then stirred and cooled to room temperature to obtain the composition, which was a white, viscous liquid suspension with a slightly characteristic odor similar to isopropanol. The final product was then filled into suitable metal or plastic containers.

[0068] Starting materials: a Products of KG Zelina, a Croatian company; b Products from BASF AG, Germany; c Products from Sekisui Specialty Chemicals Europe SL, Spain; d Products from the Italian company Carlo Erba Reagentss.rl; e Products from BYK-Chemie GmbH, Germany; f Products from Sigma-Aldrich Corporation, USA; g Products from Merck KGaA, Germany; h Products from the Turkish company Nanografi Nanotechnology.

[0069] Example 7. Preparation method of the coating composition of the present invention Composition (1000 g coating composition): (1) 32.30% (323.00 g) deionized water;a (2) 4.00% (40.00 g) polymeric dispersant: polyvinylpyrrolidone (PVP) of model Kollidon 30 (M r = 44000-54000); b (3) 7.00% (70.00 g) polymeric adhesive: Vivapharm PVA 05 fine powder polyvinyl alcohol (PVOH); degree of hydrolysis: 85-89 mol% c (4) 44.00% (440.00 g) water-miscible solvent: isopropanol; d as well as (5) 12.70% (127.00 g) powdered dielectric material: barium titanate (BaTiO3; crystal morphology: tetragonal; purity: ≥99.95%; average particle size: 370 nm). e Total: 100.00% (1000.00 g) Preparation method: A. The polymeric dispersant (2) and polymeric binder (3) are homogenized in deionized water (1) under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with ultrasonic waves (US) at 200 kHz, wherein the US irradiation power is 50 W / L of the mixture.

[0070] B. The powdered dielectric material (5) and the water-miscible organic solvent (4) were homogenized separately under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with US at 200 kHz, wherein the US irradiation power was 50 W / L of the mixture.

[0071] C. Mix the materials obtained from stage A and stage B and homogenize them. The treatment conditions are: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while applying 200 kHz US irradiation with a US irradiation power of 50 W / L to obtain the mixture. The mixture was then stirred and cooled to room temperature to obtain the composition, which is a white, viscous liquid suspension with a slightly characteristic odor similar to isopropanol. The dynamic viscosity (η) is 233.8 Pa·s. The final product was then filled into suitable metal or plastic containers.

[0072] Starting materials: aProducts of KG Zelina, a Croatian company; b Products from BASF AG, Germany; c Products of JRSPharma GmbH & Co. KG, Germany; d Products from the Italian company Carlo Erba Reagents srl; e Products from the Turkish company Nanografi Nanotechnology.

[0073] Example 8. Method for preparing the coating composition of the present invention Composition (1000 g coating composition): (1) 34.70% (347.00 g) deionized water; a (2) 4.00% (40.00 g) polymeric dispersant: polyvinylpyrrolidone (PVP) of model Kollidon 30 (M r = 44000-54000); b (3) 4.60% (46.00 g) polymeric adhesive: Vivapharm PVA 05 fine powder polyvinyl alcohol (PVOH); degree of hydrolysis: 85-89 mol% c (4) 44.00% (440.00 g) water-miscible solvent: isopropanol; d as well as (5) 12.70% (127.00 g) powdered dielectric material: barium titanate (BaTiO3; crystal morphology: tetragonal; purity: ≥99.95%; average particle size: 370 nm). e Total: 100.00% (1000.00 g) Preparation method: A. The polymeric dispersant (2) and polymeric binder (3) are homogenized in deionized water (1) under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with ultrasonic waves (US) at 200 kHz, wherein the US irradiation power is 50 W / L of the mixture.

[0074] B. The powdered dielectric material (5) and the water-miscible organic solvent (4) were homogenized separately under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with US at 200 kHz, wherein the US irradiation power was 50 W / L of the mixture.

[0075] C. Mix the materials obtained from stage A and stage B and homogenize them. The treatment conditions are: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while applying 200 kHz US irradiation with a US irradiation power of 50 W / L to obtain the mixture. The mixture was then stirred and cooled to room temperature to obtain the composition, which was a white, viscous liquid suspension with a slightly characteristic odor similar to isopropanol. The dynamic viscosity (η) was 0.1054 Pa·s. The final product was then filled into suitable metal or plastic containers.

[0076] Starting materials: a Products of KG Zelina, a Croatian company; b Products from BASF AG, Germany; c Products of JRSPharma GmbH & Co. KG, Germany; d Products from the Italian company Carlo Erba Reagents srl; e Products from the Turkish company Nanografi Nanotechnology.

[0077] Example 9. Preparation method of the coating composition of the present invention Composition (1000 g coating composition): (1) 35.70% (357.00 g) deionized water; a (2) 4.00% (40.00 g) polymeric dispersant: polyvinylpyrrolidone (PVP) of model Kollidon 30 (M r = 44000-54000); b (3) 3.60% (36.00 g) polymeric adhesive: Vivapharm PVA 05 fine powder polyvinyl alcohol (PVOH); degree of hydrolysis: 85-89 mol% c (4) 44.00% (440.00 g) water-miscible solvent: isopropanol; d as well as (5) 12.70% (127.00 g) powdered dielectric material: barium titanate (BaTiO3; crystal morphology: tetragonal; purity: ≥99.95%; average particle size: 370 nm). e Total: 100.00% (1000.00 g) Preparation method: A. The polymeric dispersant (2) and polymeric binder (3) are homogenized in deionized water (1) under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with ultrasonic waves (US) at 200 kHz, wherein the US irradiation power is 50 W / L of the mixture.

[0078] B. The powdered dielectric material (5) and the water-miscible organic solvent (4) were homogenized separately under the following conditions: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while being irradiated with US at 200 kHz, wherein the US irradiation power was 50 W / L of the mixture.

[0079] C. Mix the materials obtained from stage A and stage B and homogenize them. The treatment conditions are: stirring at 100-150 rpm for 15-20 minutes at 45-50°C, while applying 200 kHz US irradiation with a US irradiation power of 50 W / L to obtain the mixture. The mixture was then stirred and cooled to room temperature to obtain the composition, which was a white, viscous liquid suspension with a slightly characteristic odor similar to isopropanol. The dynamic viscosity (η) was 0.0937 Pa·s. The final product was then filled into suitable metal or plastic containers.

[0080] Starting materials: a Products of KG Zelina, a Croatian company; b Products from BASF AG, Germany; c Products of JRSPharma GmbH & Co. KG, Germany; d Products from the Italian company Carlo Erba Reagents srl; e Products from the Turkish company Nanografi Nanotechnology.

[0081] in conclusion: The coating composition of this invention provides a flexible insulating coating for RFID tag antennas. The effects of the flexible coating obtained by the composition include: extremely high dielectric constant and permeability, wider frequency bandwidth, multi-band capability, higher gain, and greater half-power bandwidth. It can improve read distance on lossy materials, enhance sensitivity, increase read angle, be used for impedance matching, and selectively reduce the electrical size of the tag. It can also be coated on other antennas in various industries. The mobile device, Internet of Things (IoT), and UAV industries use planar inverted-F antennas (PIFA), helical antennas, dipole antennas, and other types of antennas.

[0082] In real-world measurements of attaching high-dielectric-constant films to various RFID tags, signal gain was significantly improved by 25 dB to 30 dB. For long-life wireless edge devices, this translates to a thousand-fold reduction in communication power consumption, while simultaneously enhancing device performance.

[0083] Industrial applicability The coating composition of the present invention is used to prepare flexible insulating coatings, for example, for manufacturing RFID tag antennas. Therefore, the industrial applicability of the present invention is readily apparent.

Claims

1. A coating composition for forming a flexible insulating coating having a high dielectric constant, comprising: (i) A dielectric material selected from the group consisting of barium titanate (BaTiO3), strontium titanate (SrTiO3), and calcium copper titanate (CaCu3Ti4O3). 12 Cobalt oxide (CoO), cobalt tetroxide (Co3O4), titanium dioxide (TiO2), aluminum oxide (Al2O3), lanthanum oxide (La2O3), conjugated polymers (CP), or mixtures thereof, with a particle size of 48-500 nm and a w / w ratio of 10.00-40.00%; (ii) Polymer dispersant, 1.00-10.00% w / w; (iii) Polymer adhesives, 1.00-10.00% w / w; (iv) Water-miscible organic solvents, 30.00-55.00% w / w; (v) Optionally, one or more auxiliary components, said auxiliary components being used to impart specific technical properties to the resulting composition when applied by spraying or printing, such as surfactants, wetting agents, plasticizers, defoamers, corrosion inhibitors, and antioxidants, 0.00-2.00% w / w; and (vi) Deionized water, up to 100.00% of the composition. Its features are, In the formula, - Polyvinylpyrrolidone (PVP) is used as a polymeric dispersant; Polyvinyl alcohol (PVOH) is used as a polymeric adhesive; and - The water-miscible solvent is selected from the group consisting of isopropanol, n-propanol, or a mixture of isopropanol and n-propanol in any weight ratio with low molecular weight fatty alcohols (ROH), wherein the ROH is, for example, methanol, ethanol, n-butanol, isobutanol, sec-butanol, tert-butanol, and the relative proportions of the mixture are: Isopropanol and / or n-propanol:ROH = 1:3 - 3:1, w / w.

2. The coating composition according to claim 1, wherein the conjugated polymer (CP) is selected from the group comprising: polyaniline (PANI), poly(p-phenylene) (PPP), poly(p-phenylene vinylene) (PPV), poly[2,5-di(alkoxy)-p-phenylene vinylene], polyacetylene (PAC), polyheptandyne (PHT), polythiophene (PTH), poly(3-alkylthiophene) (P3AT) (e.g., poly(3-hexylthiophene) (P3HT)), polypyrrole (PPy), ladder poly(p-phenylene) (LPPP), or mixtures of these polymers.

3. The coating composition according to any one of the preceding claims, wherein the polyvinylpyrrolidone (PVP) used as the polymeric dispersant is selected from the group with a relative molecular mass (M). r The product grade is 2000-1200000, with M being the preferred option. r The value is 44000-54000 and the average M is... r The PVP is 40,000.

4. The coating composition according to any one of the preceding claims, wherein the polyvinyl alcohol (PVOH) used as the polymeric binder is selected from the group with a relative molecular mass (M). r The product grade is 10,000-500,000 with a degree of hydrolysis of 85.0-100%, of which M is preferred. r The PVOH is 30,000-200,000.

5. The coating composition according to any one of the preceding claims, wherein the water-miscible solvent is isopropanol.

6. The coating composition according to any one of the preceding claims, wherein the composition comprises the following components in weight percentages: (i) 15.00-30.00% w / w; (ii) 2.00-6.00% w / w; (iii) 2.00-6.00 w / w (iv) 35.00-50.00% w / w; (v) Optional, sodium dodecyl sulfate, 0.00-0.10% w / w; and (vi) 25.00-40.00% w / w.

7. The coating composition according to any one of the preceding claims, wherein the composition comprises the following components in weight percentages: (i) 15.00-30.00% w / w; (ii) 3.50-4.50% w / w; (iii) 3.50-4.50 w / w (iv) 38.00-45.00% w / w; (v) Sodium dodecyl sulfate, 0.05-0.10% w / w; and (vi) 30.00-35.00% w / w.

8. The coating composition according to any one of the preceding claims, wherein the surfactant has a hydrophilic-lipophilic balance (HLB) value of 13-40 and is selected from the group consisting of: - Anionic surfactants and other surfactants, such as sodium stearate, sodium lauryl sulfate, sodium lauryl ether sulfate or potassium cetyl phosphate; - Nonionic surfactants, such as polyoxyethylene (20) stearate, sorbitan monooleate, cocoyl glucoside, or cocodiethanolamide; amphoteric surfactants, such as cocamidopropyl betaine; or - Cationic surfactants, such as benzalkonium chloride or stearyltrimethylammonium chloride; Or a mixture of these substances.

9. The coating composition according to any one of the preceding claims, wherein the wetting agent has a hydrophilic-lipophilic balance (HLB) value of 7-13 and is selected from the group consisting of: - Alkoxylated linear saturated or unsaturated fatty alcohols containing C8-C18 carbon atoms and embedded with 2-8 ethylene oxide (EO) units, such as polyoxyethylene (4) lauryl ether; - Ammonium or alkali metal sulfosuccinates, such as sodium bis(2-ethylhexyl)sulfosuccinate; Or a mixture of these substances.

10. The coating composition according to any one of the preceding claims, wherein the plasticizer is selected from the group consisting of: epoxidized soybean oil (ESBO), epoxidized linseed oil (ELO), 3-hydroxy-2,2,4-trimethylpentyl isobutyrate, sebacate (e.g., dioctyl sebacate), diisononyl 1,2-cyclohexanedicarboxylate, bis(butylcarbitol) formaldehyde, or mixtures thereof.

11. The coating composition according to any one of the preceding claims, wherein the defoamer is selected from the group consisting of: silicone oil (e.g., polydimethylsiloxane), C6-C22 higher fatty alcohols, mineral oil, or mixtures thereof.

12. The coating composition according to any one of the preceding claims, wherein the corrosion inhibitor is selected from the group consisting of: - Inorganic salts, such as sodium silicate or potassium silicate, sodium borate or potassium borate or tetraborate, tripotassium phosphate or trisodium phosphate, potassium nitrite or sodium nitrite; - Mercaptobenzothiazole (MBT); - Primary, secondary or tertiary amines, diamines or triamines composed of C2-C8 alkyl groups, such as n-butylamine, diisopropylamine, triethylamine, ethylenediamine or diallyltriamine (DPTA). - Primary, secondary, and tertiary hydroxyalkylamines or alkoxyalkylamines, such as ethanolamine, methyldiethanolamine, and 3-methoxypropylamine; - Cyclic amines, such as morpholine, piperazine, or their alkyl monoalkyl or dialkyl derivatives containing 1-6 carbon atoms, such as N-methylmorpholine or 1,4-dimethylpiperazine; Or a salt formed by the above-mentioned amine and a weak acid, wherein the weak acid is, for example, a carboxylic acid such as acetic acid, benzoic acid, citric acid, 4-oxo-4-(p-tolyl)butyric acid; or a mixture of these substances.

13. The coating composition according to any one of the preceding claims, wherein the antioxidant is one or more substances selected from the group consisting of: 2,6-di-tert-butyl-4-methylphenol (BHT), butylated hydroxyanisole (BHA), 2,4-dimethyl-6-tert-butylphenol, N,N'-di(2-butyl)-1,4-phenylenediamine, and is free from or contains one or more auxiliary antioxidants, such as disodium ethylenediaminetetraacetate dihydrate (Na2EDTA·2H2O), or trisodium citrate dihydrate (Na3C6H5O7·2H2O), or sodium phytate (Na2C6H5O7·2H2O). 12 C6H6(OPO3)6).

14. A method for preparing a coating composition according to any one of claims 1-13, wherein the method comprises the following preparation steps: A. The polymeric dispersant, polymeric binder, and one or more optional auxiliary components are homogenized in deionized water under the following conditions: stirring at 25-500 rpm for 10-60 minutes at 10-80°C, preferably 15-40°C; preferably, ultrasonic (US) irradiation at 200 kHz-1 MHz is applied simultaneously, wherein the US irradiation power is 50-200 W / 1000 mL of the mixture. B. Specifically, the powdered dielectric material is homogenized in one or more water-miscible organic solvents under the following conditions: stirring at 25-500 rpm for 10-60 minutes at 10-80°C, preferably 15-40°C, and preferably simultaneously subjected to ultrasonic (US) irradiation at 200 kHz-1 MHz, wherein the US irradiation power is 50-200 W / 1000 mL of the mixture; C. Mix the materials obtained from stage A and stage B, and homogenize the mixture under the following conditions: stirring at 25-500 rpm for 10-60 minutes at 10-80°C, preferably 15-40°C; preferably, simultaneously applying ultrasonic (US) irradiation at 200 kHz-1 MHz, wherein the US irradiation power is 50-200 W / 1000 mL of the resulting mixture. The composition is thus prepared in the form of a viscous liquid suspension.

15. Use of a composition according to any one of claims 1-13 for forming a flexible coating having a high dielectric constant by spraying or screen printing.

16. Use of the composition according to claim 15 in RFID manufacturing, wherein the coating is used for impedance matching and the coating serves as a dielectric resonator for the antenna, thereby improving the performance of the RFID antenna.