CN116285694A - Reversible color-changing coating and preparation method and application thereof - Google Patents
Reversible color-changing coating and preparation method and application thereof Download PDFInfo
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- CN116285694A CN116285694A CN202310375205.7A CN202310375205A CN116285694A CN 116285694 A CN116285694 A CN 116285694A CN 202310375205 A CN202310375205 A CN 202310375205A CN 116285694 A CN116285694 A CN 116285694A
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- color
- changing
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- reversible
- reversible color
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- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 87
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical group CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 claims abstract description 82
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical group C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000003094 microcapsule Substances 0.000 claims abstract description 58
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- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 claims abstract description 40
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- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 22
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
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- 238000003756 stirring Methods 0.000 claims description 51
- 239000000243 solution Substances 0.000 claims description 50
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- 238000000034 method Methods 0.000 claims description 13
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- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 9
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- 239000012295 chemical reaction liquid Substances 0.000 description 6
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
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- 238000011065 in-situ storage Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 150000004701 malic acid derivatives Chemical class 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
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- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- QUBQYFYWUJJAAK-UHFFFAOYSA-N oxymethurea Chemical compound OCNC(=O)NCO QUBQYFYWUJJAAK-UHFFFAOYSA-N 0.000 description 1
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- 238000006068 polycondensation reaction Methods 0.000 description 1
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
-
- 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
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
-
- 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
- C09D5/26—Thermosensitive 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
- C09D7/20—Diluents or solvents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides a reversible color-changing coating and a preparation method and application thereof, wherein the reversible color-changing coating comprises a color-changing microcapsule and a lacquer, the color-changing microcapsule comprises a reversible color-changing material and nano silicon dioxide, the reversible color-changing material comprises 1 part of a color-developing agent, 0.25-4 parts of a color-developing agent and 40-70 parts of a solvent, the color-developing agent is crystal violet lactone, the color-developing agent is bisphenol A, and the solvent is stearyl alcohol. The reversible color-changing coating has the characteristics of stable performance, good electrical resistance, excellent heat resistance, acid and alkali resistance, obvious color-changing effect, convenient preparation, low production cost, high product yield and excellent comprehensive performance, and the color-changing range is 49-56 ℃.
Description
Technical Field
The invention belongs to the technical field of color-changing paint, and particularly relates to a reversible color-changing paint, a preparation method and application thereof.
Background
The high-voltage bushing of the transformer is used as a support and insulator of a high-voltage winding outgoing line, is an important component of the transformer, and has a crucial function on guaranteeing safe and stable operation of the transformer due to stable performance. Studies show that the probability of overheat fault occurrence caused by poor contact between the top of the sleeve cap and the external lead wire clamp and poor contact between the top of the sleeve cap and the internal winding lead wire in the high-voltage sleeve heating fault is maximum, and the sleeve cap temperature is defined as a serious defect according to DL/T664-2016 at 55 ℃. Therefore, developing transformer bushings is of great significance to army cap temperature detection studies. The temperature-indicating color-changing paint can intuitively and effectively monitor the temperature of equipment.
CN111218147a discloses a reversible color-changing material, a reversible temperature-indicating paint, a preparation method and application thereof, wherein the reversible color-changing material comprises the following components: the crystal violet lactone, bisphenol A and a color developing agent, wherein the color developing agent is stearic acid or naphthalene. The temperature indication range of the reversible color-changing material provided by the technical scheme is 69-77 ℃ and 79-82 ℃, and the requirement of detecting the fault temperature of the transformer bushing for the military cap cannot be met.
The invention discloses a low-temperature reversible thermochromic paint and a preparation method thereof, wherein the low-temperature reversible thermochromic paint comprises the following components in parts by weight: 25 to 40 parts of acrylic acid elastic emulsion, 5 to 20 parts of thermochromic microcapsule, 1 to 4 parts of glass micro powder, 2 to 5 parts of alumina, 2 to 6 parts of light calcium carbonate, 1.5 to 3.5 parts of talcum powder, 0.5 to 1.6 parts of dispersing agent, 0.2 to 0.6 part of thickening agent, 0.3 to 0.6 part of defoaming agent, 0.2 to 0.5 part of leveling agent and 35 to 58 parts of water. The color temperature of the low-temperature reversible thermochromic paint provided by the technical scheme is 37.9-40.1 ℃, and the temperature detection requirement of transformer bushing for military cap faults cannot be met.
CN111196903a discloses a reversible thermochromic ink, a preparation method and application thereof, wherein the reversible thermochromic ink comprises the following raw materials in percentage by mass: thermochromic powder: 20-30% of modified malic acid resin: 20-30%, deionized water 5-10%, isopropyl alcohol: 40-50% of ethyl acetate: 5% -8%, dispersant 1-3%, defoamer: 1 to 2 percent; the thermochromic powder is prepared from crystal violet lactone, boric acid and cetyl alcohol. The ink provided by the technical scheme shows light blue at normal temperature, shows grey white at the temperature range of 48-52 ℃, and cannot meet the requirement of transformer bushing on detecting the fault temperature of the army cap.
Therefore, it is necessary to develop a reversible color-changing coating with stable performance, suitable color-changing temperature range, obvious color-changing effect and good electrical resistance, and suitable for detecting the fault temperature of the transformer bushing and the military cap.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a reversible color-changing coating, and a preparation method and application thereof. The reversible color-changing coating has the characteristics of stable performance, excellent heat resistance, acid and alkali resistance, low production cost, simple and convenient preparation process, high product yield, obvious color-changing effect and good electrical property resistance, and the color-changing range is 49-56 ℃ and meets the requirement of transformer bushing on detecting the fault temperature of the army cap.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a reversible color-changing coating comprising color-changing microcapsules and a lacquer.
The color-changing microcapsule comprises a reversible color-changing material and nano silicon dioxide.
The reversible color-changing material comprises the following components in parts by weight: 1 part of a color former, 0.25 to 4 parts of a color former (e.g., 0.25 part, 0.3 part, 0.5 part, 1 part, 1.5 part, 2 parts, 2.5 parts, 3 parts, 3.5 parts, or 4 parts, etc.), and 40 to 70 parts of a solvent (e.g., 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, or 70 parts, etc.).
The color former is crystal violet lactone, the color developing agent is bisphenol A, and the solvent is stearyl alcohol.
In the invention, the reversible color-changing material is prepared from crystal violet lactone, bisphenol A and stearyl alcohol, has the characteristics of high color-changing speed, obvious change and stable performance, and can realize the color-changing temperature range of 49-56 ℃ and meet the requirement of detecting the fault temperature of the transformer bushing and the military cap.
Preferably, the color-changing microcapsule comprises reversible color-changing material, urea-formaldehyde resin pre-polymerization liquid, gum arabic powder water solution, acetic acid solution, ammonium chloride solution and nano silicon dioxide.
According to the invention, the color-changing material is microencapsulated into the color-changing microcapsule, the urea resin is used as a wall material to wrap the color-changing material in the microcapsule, so that the weather resistance of the color-changing material is improved, the color-changing microcapsule and the lacquer are mixed, the color-changing microcapsule can be directly coated on the surface of the tested equipment, the color is changed when the failure temperature is reached, and the abnormal heating phenomenon of the tested equipment can be effectively reflected.
Preferably, the nanosilica is hydrophobic nanosilica.
Preferably, the nano-silica has a particle size of 20 to 100nm, for example, 20nm, 30nm, 40nm, 50nm, 60nm, 70nm, 80nm, 90nm, 100nm, or the like.
In the invention, the hydrophobic nano silicon dioxide has stronger hydrophobic property and can improve the hydrophobicity of the color-changing microcapsule. In addition, the nano silicon dioxide has the characteristics of small particle size and large specific surface area, has strong surface adsorption performance and large surface energy, has high chemical purity and good dispersion performance, and can effectively improve the wall material strength, the surface smoothness and the coating rate of the color-changing microcapsule, thereby improving the ageing resistance of the color-changing microcapsule.
Preferably, the urea-formaldehyde resin prepolymer solution comprises urea, formaldehyde solution, deionized water and triethanolamine.
In the invention, the color-changing microcapsule takes urea-formaldehyde resin as a wall material, formaldehyde solution reacts with urea to generate methylol urea and dimethylol urea in weak alkaline environment, and polycondensation reaction is carried out in acidic condition to generate the wall material urea-formaldehyde resin, which has the advantages of good sealing property, low light absorbance, good light transmittance and low refractive index, and in addition, has good acid and alkali resistance and solvent resistance, and good toughness, elasticity, mechanical processing resistance and heat resistance.
Preferably, the solvent of the formaldehyde solution is deionized water, and the mass percentage of formaldehyde in the formaldehyde solution is 35-40%, such as 35%, 35.5%, 36%, 37%, 37.5%, 38%, 38.5%, 39%, 39.5% or 40%, etc.
Preferably, the urea resin prepolymer liquid comprises the following components in parts by weight: 8 to 15 parts (for example, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts, etc.), 20 to 25 parts (for example, 20 parts, 20.5 parts, 21 parts, 21.5 parts, 22 parts, 22.5 parts, 23 parts, 24 parts or 25 parts, etc.), and 40 to 60 parts (for example, 40 parts, 42 parts, 46 parts, 48 parts, 50 parts, 54 parts, 56 parts, 58 parts or 60 parts, etc.) of deionized water.
Preferably, the pH of the urea resin prepolymer solution is adjusted to 8.0 to 9.0 (e.g., 8.0, 8.1, 8.3, 8.5, 8.7, 8.8, 8.9, or 9.0, etc.), and the pH is adjusted by adding triethanolamine.
Preferably, the preparation method of the urea resin prepolymer liquid comprises the following steps: mixing urea, formaldehyde solution and deionized water, completely dissolving, adding triethanolamine, regulating pH of the mixed solution to 8.0-9.0, heating, stirring, and cooling to obtain urea-formaldehyde resin prepolymer.
Preferably, the heating temperature is 70-80 ℃ (e.g. 70 ℃, 71 ℃, 72 ℃, 73 ℃, 74 ℃, 75 ℃, 76 ℃, 77 ℃, 78 ℃, 79 ℃ or 80 ℃, etc.), the stirring speed is 200-400 r/min, e.g. 200r/min, 220r/min, 240r/min, 260r/min, 280r/min, 300r/min, 320r/min, 340r/min, 360r/min, 380r/min or 400r/min, etc., and the stirring time is 0.5-1.5 h (e.g. 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1.0h, 1.1h, 1.2h, 1.3h, 1.4h or 1.5h, etc.).
Preferably, the mass percentage of the gum arabic powder in the aqueous solution of the gum arabic powder is 3% -5%, for example 3%, 3.2%, 3.5%, 3.7%, 4%, 4.2%, 4.5%, 4.7% or 5%, etc.
Preferably, the solvent of the acetic acid solution is deionized water, and the mass percentage of acetic acid in the acetic acid solution is 95-99%, for example 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5% or 99% or the like.
Preferably, the solvent of the ammonium chloride solution is deionized water, and the mass percentage of ammonium chloride in the ammonium chloride solution is 8-12%, for example 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5% or 12%, etc.
Preferably, the color-changing microcapsule comprises the following components in parts by weight: 8 to 12 parts (e.g., 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, or 12 parts, etc.), 45 to 55 parts (e.g., 45 parts, 46 parts, 47 parts, 48 parts, 50 parts, 52 parts, 54 parts, or 55 parts, etc.), 20 to 30 parts (e.g., 20 parts, 22 parts, 24 parts, 26 parts, 27 parts, 28 parts, 29 parts, or 30 parts, etc.), 25 to 35 parts (e.g., 25 parts, 26 parts, 28 parts, 30 parts, 32 parts, 33 parts, 34 parts, or 35 parts, etc.), and 0.5 to 2 parts (e.g., 0.5 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.6 parts, 1.8 parts, or 2 parts, etc.) of the aqueous solution of the curable color material.
Preferably, the pH of the solution is adjusted to 2.5-3.5 (e.g., 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, or 3.5, etc.) during the preparation of the color-changing microcapsules, and the pH is adjusted by the addition of an acetic acid solution.
Preferably, the base paint comprises an anti-fouling flashover composite paint.
Preferably, the anti-pollution flashover composite coating is a transparent colorless type durable anti-pollution flashover composite coating.
In the invention, the base paint is transparent colorless persistent anti-pollution flashover composite paint. The transparent colorless type durable anti-pollution flashover composite coating has the characteristic of durable in-situ forming, has excellent hydrophobicity and balanced hydrophobic migration, and can not generate continuous water films on the surface of a coating formed by the reversible color-changing coating in severe weather (such as in a medium rain environment). The transparent colorless persistent anti-pollution flashover composite coating has the advantages of excellent electrical insulation performance, good flame retardant property, stronger adhesive force, acid and alkali resistance, ultraviolet resistance and good self-cleaning performance, is colorless and transparent, does not influence the color development of the color-changing microcapsules, and can avoid the influence of the color of the lacquer on the color change of the observed color-changing microcapsules.
Preferably, the reversible color-changing coating comprises the following components in parts by weight: 1 to 3 parts (for example, 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts, etc.) of color-changing microcapsule and 10 parts of lacquer.
In a second aspect, the present invention provides a method for preparing the reversible color-changing paint according to the first aspect, wherein the preparation method includes the following steps:
(1) And heating and melting the solvent, sequentially adding the color former and the color former, stirring, and cooling to obtain the reversible color-changing material.
(2) And mixing the reversible color-changing material with nano silicon dioxide to obtain the color-changing material microcapsule.
(3) And mixing the color-changing microcapsule with the lacquer to obtain the reversible color-changing coating.
Preferably, the heating temperature in step (1) is 60-80 ℃, such as 60 ℃, 62 ℃, 65 ℃, 68 ℃, 70 ℃, 72 ℃, 75 ℃, 78 ℃, or 60 ℃, and the like, the stirring speed is 300-800 r/min, such as 300r/min, 350r/min, 400r/min, 450r/min, 500r/min, 550r/min, 600r/min, 650r/min, 700r/min, 750r/min, or 800r/min, and the like, and the stirring time is 10-30 min, such as 10min, 12min, 15min, 17min, 20min, 13min, 25min, 28min, or 30min, and the cooling time is 12-24 h, such as 12h, 15h, 18h, 19h, 20h, 21h, 22h, 23h, or 24h, and the like.
Preferably, the cooling of step (1) further comprises milling and screening by standard mesh screening of reversibly variable colour materials having a particle size of less than 100 μm (e.g. 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm etc.).
Preferably, the mixing of step (2) comprises the steps of: heating reversible color-changing material at 65-70deg.C (65 deg.C, 65.5 deg.C, 66 deg.C, 66.5 deg.C, 67 deg.C, 67.5 deg.C, 68 deg.C, 69 deg.C or 70deg.C, etc.) to dissolve completely, adding gum arabic powder solution 1500-2500 r/min (1500 r/min, 1700r/min, 1900r/min, 2000r/min, 2100r/min, 2300r/min, 2400r/min or 2500r/min, etc.), stirring, cooling to form O/W emulsion, adjusting stirring speed to 250-300 r/min (250 r/min, 260r/min, 270r/min, 280r/min, 290r/min, 295r/min or 300r/min, etc.), slowly dripping urea-formaldehyde resin pre-polymerization solution for 25-35 min (25 min, 26min, 27min, 28min, 30min, 32min, 33min or 35min, etc.), slowly adding acetic acid solution in batches, firstly adding the acetic acid solution to adjust the pH to 3.0-3.5, continuously stirring for 15-25 min (such as 15min, 16min, 17min, 18min, 20min, 22min, 23min, 24min or 25min, and the like), adding ammonium chloride solution and nano silicon dioxide, stirring for reacting for 0.5-2.5 h, adding the acetic acid solution again to adjust the pH to 2.5-3.0, heating to 65-70 ℃ (such as 65 ℃, 65.5 ℃, 66 ℃, 66.5 ℃, 67 ℃, 67.5 ℃, 68 ℃, 69 ℃ or 70 ℃, and the like), stirring for 0.5-1.5 h (such as 0.5h, 0.8h, 0.9h, 1.1h, 1.2h, 1.4h or 1.5h, and the like) under 150-250 r/min (such as 150r/min, 170r/min, 180r/min, 200r/min, 220r/min, 230r/min, 250r/min, and the like), cooling, filtering, and vacuum drying.
Preferably, the mixing in the step (3) is stirring and mixing under vacuum condition, and the stirring speed is 250-300 r/min (such as 250r/min, 255r/min, 260r/min, 270r/min, 280r/min, 290r/min or 300r/min, etc.), and the stirring time is 15-25 min (such as 15min, 16min, 17min, 18min, 20min, 22min, 23min, 24min or 25min, etc.).
In a third aspect, the present invention provides a transformer bushing armcap coated with a reversible color-changing coating as described in the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
the invention has obvious color-changing effect of the prepared reversible color-changing coating through the design of the types and proportion of the reversible color-changing material components, the color-changing range is 49-56 ℃, and the color-changing range meets the detection requirement of the transformer bushing on the fault temperature of the military cap. By adding the nano silicon dioxide, the wall material strength, the surface smoothness and the coating rate of the color-changing microcapsule are effectively improved, and the ageing resistance of the color-changing microcapsule is further improved. The reversible color-changing coating provided by the invention has the characteristics of obvious color-changing effect, stable performance, good electrical resistance, excellent heat resistance, acid and alkali resistance, simple and convenient preparation process, low production cost, high product yield and excellent comprehensive performance. The surface of the reversible color-changing coating equipment cannot influence the normal operation of the equipment, and the reversible color-changing coating equipment can be used for detecting the fault temperature of the transformer bushing and the military cap.
Drawings
FIG. 1 is an SEM image of color-changing microcapsules prepared in example 1;
FIG. 2 is a graph showing the comparison of the effects of the reversible color-changing materials prepared from crystal violet lactone, bisphenol A and stearyl alcohol in different mass ratios as provided in examples 1 to 6 and comparative example 1 before and after color change.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
The embodiment provides a reversible color-changing coating, which comprises the following components in parts by weight:
the reversible color-changing coating comprises the following components in parts by weight: 1 part of color-changing microcapsule and 10 parts of lacquer (transparent colorless persistent anti-pollution flashover composite coating, produced by Hebei Zhonghua Yu electric technology Co., ltd.).
The color-changing microcapsule comprises the following components in parts by weight: 10 parts of reversible color-changing material, 50 parts of gum arabic powder aqueous solution (5 wt% of gum arabic powder), 25 parts of urea-formaldehyde resin prepolymer solution, 30 parts of acetic acid solution (98 wt% of acetic acid), 30 parts of ammonium chloride solution (10 wt% of ammonium chloride) and 1 part of nano silicon dioxide (with the particle size of 20 nm).
The reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 0.25 part of bisphenol A and 50 parts of stearyl alcohol.
The urea resin prepolymer is prepared by the following preparation method.
10 parts of urea, 23.7 parts of formaldehyde solution (37 wt% of formaldehyde) and 50 parts of deionized water are weighed, added into a three-neck flask, mixed and stirred until the mixture is completely dissolved, triethanolamine is added to adjust the pH of the mixed solution to 8.5, the three-neck flask is placed in a magnetic stirrer which is heated at a constant temperature of 75 ℃ and stirred for 1h at a rotating speed of 300r/min, and natural cooling is carried out to obtain urea resin prepolymer.
The reversible color-changing paint is prepared by the following preparation method:
(1) The reversible color-changing material is prepared as follows:
1g of crystal violet lactone, 0.25g of bisphenol A and 50g of stearyl alcohol are weighed, the weighed stearyl alcohol is placed in a beaker, a preservative film is sealed and placed in a constant-temperature heating magnetic stirrer for heating and melting, the equipment temperature is set to 65 ℃, the crystal violet lactone and the bisphenol A are sequentially placed after the stearyl alcohol is completely melted, and the rotating speed is set to 800r/min and the heating and stirring are continuously carried out for 30min. Naturally cooling for 24h to obtain a blue reversible color-changing material in a solidification state, grinding the material in a ceramic mortar, and screening powder of the reversible color-changing material smaller than 100 mu m by a standard mesh sieve;
(2) The preparation of the color-changing microcapsule is as follows:
adding 10g of the reversible color-changing material obtained in the step (1) into a beaker as a core material, and putting the beaker into a constant-temperature heating magnetic stirrer to slowly heat the beaker to 65 ℃ so as to completely dissolve the reversible color-changing material; adding 50g of 5% aqueous solution of gum arabic powder into the reversible color-changing material in a molten state, continuously stirring at a speed of 2000r/min, and continuously dispersing at a reduced temperature for a certain time to form O/W emulsion; adjusting the stirring speed to 300r/min, slowly dripping 25g urea resin prepolymer into a beaker, controlling the dripping to be completed for 30min, and then continuing stirring at 300 r/min;
slowly adding an acetic acid solution into the reaction system in batches, adjusting the pH to 3.5, continuously stirring for 20min, adding 30g of an ammonium chloride solution with the mass fraction of 10% and 1g of nano silicon dioxide into the system, stirring at 300r/min for reaction for 2h, continuously adjusting the pH of the reaction system to 2.5, heating to 65 ℃, stirring at 200r/min for 1h, and cooling to room temperature. Finally, carrying out suction filtration on the reaction liquid, washing the reaction liquid with a large amount of distilled water, and drying a filter cake in a vacuum drying oven to obtain the color-changing microcapsule.
(3) The reversible color-changing paint is prepared as follows:
mixing 1g of the color-changing microcapsule obtained in the step (2) with 10g of the transparent colorless type durable anti-pollution flashover composite coating, and stirring for 20min under the condition of vacuumizing 300r/min to prepare the reversible color-changing coating.
Example 2
The embodiment provides a reversible color-changing coating, which comprises the following components in parts by weight:
the reversible color-changing coating comprises the following components in parts by weight: 3 parts of color-changing microcapsule and 10 parts of lacquer (transparent colorless type durable anti-pollution flashover composite coating, produced by Hebei Zhonghua Yu electric technology Co., ltd.).
The color-changing microcapsule comprises the following components in parts by weight: 12 parts of reversible color-changing material, 55 parts of gum arabic powder aqueous solution (3 wt% of gum arabic powder), 20 parts of urea-formaldehyde resin prepolymer solution, 35 parts of acetic acid solution (95 wt% of acetic acid), and 35 parts of ammonium chloride solution (8 wt% of ammonium chloride), and 2 parts of nano silicon dioxide (with the particle size of 50 nm).
The reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 0.5 part of bisphenol A and 50 parts of stearyl alcohol.
The urea resin prepolymer is prepared by the following preparation method.
15 parts of urea, 25 parts of formaldehyde solution (35 wt% of formaldehyde) and 60 parts of deionized water are weighed, added into a three-neck flask, mixed and stirred until the mixture is completely dissolved, triethanolamine is added to adjust the pH of the mixed solution to 8.5, the three-neck flask is placed in a magnetic stirrer which is heated at a constant temperature of 75 ℃ and stirred for 0.5h at a rotating speed of 400r/min, and natural cooling is carried out to obtain urea resin prepolymer.
The reversible color-changing paint is prepared by the following preparation method:
(1) The reversible color-changing material is prepared as follows:
1g of crystal violet lactone, 0.5g of bisphenol A and 50g of stearyl alcohol are weighed, the weighed stearyl alcohol is placed in a beaker, a preservative film is sealed and placed in a constant-temperature heating magnetic stirrer for heating and melting, the equipment temperature is set to 80 ℃, and the crystal violet lactone and the bisphenol A are sequentially placed after the stearyl alcohol is completely melted, and the rotating speed is set to 300r/min and the continuous heating and stirring are carried out for 20min. Naturally cooling for 12h to obtain a blue reversible color-changing material in a solidification state, grinding the material in a ceramic mortar, and screening powder of the reversible color-changing material smaller than 100 mu m by a standard mesh sieve;
(2) The preparation of the color-changing microcapsule is as follows:
adding 12g of the reversible color-changing material obtained in the step (1) into a beaker as a core material, and putting the beaker into a constant-temperature heating magnetic stirrer to slowly heat the beaker to 70 ℃ so as to completely dissolve the reversible color-changing material; adding 55g of gum arabic powder aqueous solution with mass fraction of 3% into the reversible color-changing material in a molten state, continuously stirring at a speed of 2500r/min, and continuously dispersing at a reduced temperature for a certain time to form O/W emulsion; adjusting the stirring speed to 350r/min, slowly dripping 20g of urea resin prepolymer into a beaker, controlling the dripping to be completed for 25min, and then continuing stirring at 350 r/min;
slowly adding an acetic acid solution into the reaction system in batches, adjusting the pH to 3.5, continuously stirring for 25min, adding 35g of an 8% ammonium chloride solution and 2g of nano silicon dioxide into the system, stirring at 350r/min for 2.5h, continuously adjusting the pH of the reaction system to 2.5, heating to 70 ℃, stirring at 250r/min for 1.5h, and cooling to room temperature. Finally, carrying out suction filtration on the reaction liquid, washing the reaction liquid with a large amount of distilled water, and drying a filter cake in a vacuum drying oven to obtain the color-changing microcapsule.
(3) The reversible color-changing paint is prepared as follows:
3g of the color-changing microcapsule obtained in the step (2) is mixed with 10g of transparent colorless type durable anti-pollution flashover composite coating, and the mixture is stirred for 25min under the condition of 250r/min of vacuum pumping to prepare the reversible color-changing coating.
Example 3
The embodiment provides a reversible color-changing coating, which comprises the following components in parts by weight:
the reversible color-changing coating comprises the following components in parts by weight: 2 parts of color-changing microcapsule and 10 parts of lacquer (transparent colorless persistent anti-pollution flashover composite coating, produced by Hebei Zhonghua Yu electric technology Co., ltd.).
The color-changing microcapsule comprises the following components in parts by weight: 8 parts of reversible color-changing material, 45 parts of gum arabic powder aqueous solution (4 wt% of gum arabic powder), 30 parts of urea-formaldehyde resin prepolymer solution, 30 parts of acetic acid solution (99 wt% of acetic acid), 30 parts of ammonium chloride solution (12 wt% of ammonium chloride) and 0.5 part of nano silicon dioxide (with the particle size of 100 nm).
The reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 1 part of bisphenol A and 50 parts of stearyl alcohol.
The urea resin prepolymer is prepared by the following preparation method.
8 parts of urea, 20 parts of formaldehyde solution (40 wt% of formaldehyde) and 40 parts of deionized water are weighed, added into a three-neck flask, mixed and stirred until the urea formaldehyde solution is completely dissolved, triethanolamine is added to adjust the pH of the mixed solution to 8.5, the three-neck flask is placed in a magnetic stirrer which is heated at a constant temperature of 75 ℃ and stirred for 1.5 hours at a rotating speed of 200r/min, and natural cooling is carried out to obtain urea formaldehyde resin prepolymer.
The reversible color-changing paint is prepared by the following preparation method:
(1) The reversible color-changing material is prepared as follows:
1g of crystal violet lactone, 0.1g of bisphenol A and 50g of stearyl alcohol are weighed, the weighed stearyl alcohol is placed in a beaker, a preservative film is sealed and placed in a constant-temperature heating magnetic stirrer for heating and melting, the equipment temperature is set to 75 ℃, and the crystal violet lactone and the bisphenol A are sequentially placed after the stearyl alcohol is completely melted, and the rotating speed is set to 500r/min and the continuous heating and stirring are carried out for 10min. Naturally cooling for 18h to obtain a blue reversible color-changing material in a solidification state, grinding the material in a ceramic mortar, and screening powder of the reversible color-changing material smaller than 100 mu m by a standard mesh sieve;
(2) The preparation of the color-changing microcapsule is as follows:
adding 8g of the reversible color-changing material obtained in the step (1) into a beaker as a core material, and putting the beaker into a constant-temperature heating magnetic stirrer to slowly heat the beaker to 65 ℃ so as to completely dissolve the reversible color-changing material; adding 45g of an aqueous solution of gum arabic powder with the mass fraction of 4% into a reversible color-changing material in a molten state, continuously stirring at a speed of 1500r/min, and continuously dispersing at a reduced temperature for a certain time to form an O/W emulsion; adjusting the stirring speed to 250r/min, slowly dripping 30g of urea resin prepolymer into a beaker, controlling the dripping to be finished for 35min, and then continuing stirring at 250 r/min;
slowly adding an acetic acid solution into the reaction system in batches, adjusting the pH to 3.5, continuously stirring for 15min, adding 25g of an ammonium chloride solution with the mass fraction of 12% and 0.5g of nano silicon dioxide into the system, stirring at 250r/min for reaction for 1.5h, continuously adjusting the pH of the reaction system to 2.5, heating to 65 ℃, stirring at 150r/min for 0.5h, and cooling to room temperature. Finally, carrying out suction filtration on the reaction liquid, washing the reaction liquid with a large amount of distilled water, and drying a filter cake in a vacuum drying oven to obtain the color-changing microcapsule.
(3) The reversible color-changing paint is prepared as follows:
mixing 2g of the color-changing microcapsule obtained in the step (2) with 10g of transparent colorless type durable anti-pollution flashover composite coating, and stirring for 15min under the condition of vacuumizing 270r/min to prepare the reversible color-changing coating.
Example 4
This example provides a reversible color-changing paint and a preparation method thereof, which differ from example 1 only in that:
the reversible color-changing coating comprises the following components in parts by weight: 1.5 parts of color-changing microcapsule and 10 parts of lacquer.
The reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 2 parts of bisphenol A and 50 parts of stearyl alcohol.
Step (2) is to weigh 1g of crystal violet lactone, 2g of bisphenol A and 50g of stearyl alcohol.
Step (3) is to mix 1.5g of the color-changing microcapsule with 10g of the transparent colorless type durable anti-pollution flashover composite coating.
Other conditions were the same as in example 1.
Example 5
This example provides a reversible color-changing paint and a preparation method thereof, which differ from example 1 only in that:
the reversible color-changing coating comprises the following components in parts by weight: 2 parts of color-changing microcapsule and 10 parts of lacquer.
The reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 4 parts of bisphenol A and 50 parts of stearyl alcohol.
Step (2) is to weigh 1g of crystal violet lactone, 4g of bisphenol A and 50g of stearyl alcohol.
And step (3) is to mix 2g of the color-changing microcapsule with 10g of the transparent colorless type durable anti-pollution flashover composite coating.
Other conditions were the same as in example 1.
Example 6
This example provides a reversible color-changing paint and a preparation method thereof, which differ from example 1 only in that:
the reversible color-changing coating comprises the following components in parts by weight: 3.5 parts of color-changing microcapsule and 10 parts of lacquer.
The reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 0.5 part of bisphenol A and 40 parts of stearyl alcohol.
Step (2) is to weigh 1g of crystal violet lactone, 0.5g of bisphenol A and 40g of stearyl alcohol.
Step (3) is to mix 3.5g of the color-changing microcapsule with 10g of the transparent colorless type durable anti-pollution flashover composite coating.
Other conditions were the same as in example 1.
Comparative example 1
This comparative example provides a reversible color-changing coating and a method for preparing the same, which differ from example 1 only in that:
the reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 0.5 part of bisphenol A and 90 parts of stearyl alcohol.
Step (2) is to weigh 1g of crystal violet lactone, 0.5g of bisphenol A and 90g of stearyl alcohol.
Other conditions were the same as in example 1.
Comparative example 2
This comparative example provides a reversible color-changing coating and a method for preparing the same, which differ from example 1 only in that:
the reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 0.25 part of bisphenol A and 20 parts of stearyl alcohol.
Step (2) is to weigh 1g of crystal violet lactone, 0.25g of bisphenol A and 20g of stearyl alcohol.
Other conditions were the same as in example 1.
Comparative example 3
This comparative example provides a reversible color-changing coating and a method for preparing the same, which differ from example 1 only in that:
the reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 0.1 part of bisphenol A and 50 parts of stearyl alcohol.
Step (2) is to weigh 1g of crystal violet lactone, 0.1g of bisphenol A and 50g of stearyl alcohol.
Other conditions were the same as in example 1.
Comparative example 4
This comparative example provides a reversible color-changing coating and a method for preparing the same, which differ from example 1 only in that:
the reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 20 parts of bisphenol A and 50 parts of stearyl alcohol.
Step (2) is to weigh 1g of crystal violet lactone, 20g of bisphenol A and 50g of stearyl alcohol.
Other conditions were the same as in example 1.
Comparative example 5
This comparative example provides a reversible color-changing coating and a method for preparing the same, which differ from example 1 only in that:
the reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 0.25 part of bisphenol A and 50 parts of hexadecanol.
Step (2) is to weigh 1g of crystal violet lactone, 0.25g of bisphenol A and 50g of cetyl alcohol.
Other conditions were the same as in example 1.
Comparative example 6
This comparative example provides a reversible color-changing coating and a method for preparing the same, differing from example 1 only in that the components of the color-changing microcapsules do not include nanosilica, except that the conditions are the same as in example 1.
Comparative example 7
This comparative example provides a reversible color-changing paint and a method for preparing the same, which is different from example 1 only in that,
the reversible color-changing material comprises the following components in parts by weight: 1 part of crystal violet lactone, 1 part of palmitic acid and 50 parts of stearyl alcohol.
Step (2) is to weigh 1g of crystal violet lactone, 1 part of palmitic acid and 50 parts of stearyl alcohol.
Other conditions were the same as in example 1.
The reversible color-changing materials and reversible color-changing paints provided in examples and comparative examples were subjected to the following performance tests:
(1) Color change temperature: 1g of reversible color-changing material sample is taken and placed in a 100ml beaker, the initial temperature of an oil bath pot is set to 40 ℃, a uniform temperature-rising method is adopted, the temperature-rising speed is set to 1 ℃/min, and the color-changing temperature range of the reversible color-changing material is recorded.
(2) Color change, time to compound color: after the reversible color-changing material is naturally cooled and solidified, the oil bath is set to 65 ℃, and the time is counted when the surface of the sample starts to change color until the surface is completely changed to obtain the color-changing time. And (3) naturally cooling the completely discolored sample under the normal temperature condition, and starting timing when the test sample is locally discolored until the completely multiple colors are the multiple colors.
(3) Saturation: the saturation in the HSV (hue saturation value) color space model is adopted to quantitatively represent the color shade of the same color system, the color of the reversible color change material sample before color change is recorded by using a Nikon D750 camera, and the saturation is extracted from the image by using Python software.
The test results are shown in tables 1 and 2.
TABLE 1
| Color change temperature (. Degree. C.) | Color change time(s) | Multiple color time(s) | Saturation level | |
| Example 1 | 49-55 | 18 | 63 | 47 |
| Example 2 | 49-56 | 23 | 65 | 61 |
| Example 3 | 49-56 | 31 | 62 | 64 |
| Example 4 | 50-56 | 38 | 86 | 65 |
| Example 5 | 48-55 | 70 | 108 | 68 |
| Example 6 | 52-56 | 33 | 63 | 63 |
TABLE 2
| Color change temperature (. Degree. C.) | Color change time(s) | Multiple color time(s) | Saturation level | |
| Comparative example 1 | 46-53 | 19 | 59 | 36 |
| Comparative example 2 | 52-59 | 33 | 78 | 68 |
| Comparative example 3 | 43-51 | 16 | 53 | 23 |
| Comparative example 4 | 53-59 | 43 | 123 | 51 |
| Comparative example 5 | 41-45 | 21 | 42 | 64 |
| Comparative example 6 | 47-55 | 21 | 67 | 48 |
| Comparative example 7 | / | / | / | / |
In Table 2 "/" represents that the experimental results were not measured.
From the performance test data in tables 1 and 2, it can be seen that the color-changing ranges of the reversible color-changing materials and the reversible color-changing coatings provided in examples 1 to 6 are 49-56 ℃, and fig. 1 is an SEM image of the color-changing microcapsules prepared in example 1, which are spherical; fig. 2 is a graph showing the effects of the reversible color-changing materials before and after the change of the color, wherein the reversible color-changing materials have obvious color-changing effects, the color before the change of the color is dark blue, the color after the change of the color is white, and the color gradually changes from dark blue to white along with the increase of the temperature.
From the saturation values in fig. 2 and table 1, it can be seen that when the mass ratio of the crystal violet lactone to the stearyl alcohol is kept unchanged (the ratio of the crystal violet lactone to the stearyl alcohol is 1:50), the color of the reversible color-changing material before changing color gradually deepens as the proportion of the bisphenol a increases, and the color change is obvious after the mass ratio of the crystal violet lactone, the bisphenol a and the stearyl alcohol reaches 1:1:50 compared with 1:1:50. When the mass ratio of crystal violet lactone to bisphenol A is kept unchanged (the ratio of crystal violet lactone to bisphenol A is 1:0.5), the color of a sample becomes lighter gradually along with the increase of the proportion of stearyl alcohol, and the change range is smaller than that of the condition of changing the ratio of bisphenol A. The reversible color-changing material with the mass ratio of crystal violet lactone, bisphenol A and stearyl alcohol of 1:4:50 still has a small part of blue phenomenon after being heated to change color, and the other parts of the reversible color-changing material are white after being changed in color.
Compared with example 1, if bisphenol A is 0.5 part and stearyl alcohol is 90 parts in the reversible color-changing material (comparative example 1), the prepared reversible color-changing coating has light color, the initial saturation is only 36, the change before and after color change is not obvious, and the phenomenon that the change cannot be observed in actual sites may exist.
Compared with the embodiment 1, if the octadecanol in the reversible color-changing material is 20 parts (comparative example 2), the color of the prepared reversible color-changing coating is very dark, the color-changing temperature range is 52-59 ℃, and the early warning can not be accurately performed at about 55 ℃.
Compared with example 1, if bisphenol A in the reversible color-changing material is 0.1 part (comparative example 3), the color of the prepared reversible color-changing paint is very light, the initial saturation is only 23, the change before and after the color change is not obvious, and the color change of the paint cannot be observed in actual field application.
Compared with example 1, if bisphenol A in the reversible color-changing material is 20 parts (comparative example 4), the prepared reversible color-changing coating has darker color, the color-changing temperature range is 53-59 ℃, early warning can not be performed more accurately at about 55 ℃, the color-changing time and the double-color time are longer, and the sensitivity is poorer.
Compared with the embodiment 1, if the stearyl alcohol in the reversible color-changing material is replaced by cetyl alcohol (comparative example 5), the color-changing temperature range of the prepared reversible color-changing coating is 41-45 ℃, and the color-changing range does not meet the range required by the fault temperature detection of the high-voltage bushing of the transformer.
Compared with example 1, if the color-changing microcapsule does not contain nano silicon dioxide (comparative example 6), it can be observed by SEM that the microcapsule prepared without adding nano silicon dioxide has rough surface and larger gaps, and the microcapsule added with nano silicon dioxide has flat surface, good encapsulation rate and better weather resistance.
In comparison with example 1, when bisphenol A was replaced with palmitic acid (comparative example 7), the resulting material could not be discolored and could not realize the reversible temperature indicating function.
The applicant states that the process of the invention is illustrated by the above examples, but the invention is not limited to, i.e. does not mean that the invention must be carried out in dependence on the above process steps. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of selected raw materials, addition of auxiliary components, selection of specific modes, etc. fall within the scope of the present invention and the scope of disclosure.
Claims (10)
1. The reversible color-changing coating is characterized by comprising color-changing microcapsules and lacquer;
the color-changing microcapsule comprises a reversible color-changing material and nano silicon dioxide;
the reversible color-changing material comprises the following components in parts by weight: 1 part of color former, 0.25-4 parts of color former and 40-70 parts of solvent;
the color former is crystal violet lactone, the color developing agent is bisphenol A, and the solvent is stearyl alcohol.
2. The reversible color-changing paint according to claim 1, wherein the color-changing microcapsule comprises a reversible color-changing material, a urea-formaldehyde resin prepolymer solution, an aqueous solution of gum arabic powder, an acetic acid solution, an ammonium chloride solution, and nano silica;
preferably, the nanosilica is hydrophobic nanosilica;
preferably, the particle size of the nano silicon dioxide is 20-100 nm.
3. The reversible color-changing paint as claimed in claim 1 or 2, wherein the urea-formaldehyde resin prepolymer solution comprises urea, formaldehyde solution, deionized water and triethanolamine;
preferably, the solvent of the formaldehyde solution is deionized water, and the mass percentage of formaldehyde in the formaldehyde solution is 35-40%;
preferably, the urea resin prepolymer liquid comprises the following components in parts by weight: 8-15 parts of urea, 20-25 parts of formaldehyde solution and 40-60 parts of deionized water;
preferably, the pH of the urea resin prepolymer liquid is adjusted to 8.0-9.0, and the pH is adjusted by adding triethanolamine;
preferably, the preparation method of the urea resin prepolymer liquid comprises the following steps: mixing urea, formaldehyde solution and deionized water, completely dissolving, adding triethanolamine, regulating the pH of the mixed solution to 8.0-9.0, heating, stirring and cooling to obtain urea-formaldehyde resin prepolymer;
preferably, the heating temperature is 70-80 ℃, the stirring rotating speed is 200-400 r/min, and the stirring time is 0.5-1.5 h.
4. A reversible color-changing paint as claimed in claim 2 or 3, wherein the mass percentage of the gum arabic powder in the aqueous solution of the gum arabic powder is 3% to 5%;
preferably, the solvent of the acetic acid solution is deionized water, and the mass percentage of acetic acid in the acetic acid solution is 95-99%;
preferably, the solvent of the ammonium chloride solution is deionized water, and the mass percentage of ammonium chloride in the ammonium chloride solution is 8-12%.
5. The reversible color-changing paint as claimed in any one of claims 1 to 4, wherein the color-changing microcapsules comprise the following components in parts by weight: 8-12 parts of reversible color-changing material, 45-55 parts of gum arabic powder aqueous solution, 20-30 parts of urea-formaldehyde resin prepolymer solution, 25-35 parts of ammonium chloride solution and 0.5-2 parts of nano silicon dioxide;
preferably, the pH of the solution is adjusted to 2.5-3.5 during the preparation of the color-changing microcapsule, and the pH is adjusted by adding acetic acid solution.
6. The reversible color-changing paint of any one of claims 1 to 5, wherein the base paint comprises an anti-fouling flashover composite paint;
preferably, the anti-pollution flashover composite coating is a transparent colorless type durable anti-pollution flashover composite coating.
7. The reversible color-changing paint according to any one of claims 1 to 6, wherein the reversible color-changing paint comprises the following components in parts by weight: 1-3 parts of color-changing microcapsule and 10 parts of lacquer.
8. The method for producing a reversible color-changing paint according to any one of claims 1 to 7, characterized in that the method comprises the steps of:
(1) Heating and melting the solvent, sequentially adding the color former and the color former, stirring, and cooling to obtain reversible color-changing material;
(2) Mixing a reversible color-changing material with nano silicon dioxide to obtain a color-changing material microcapsule;
(3) And mixing the color-changing microcapsule with the lacquer to obtain the reversible color-changing coating.
9. The method according to claim 8, wherein the heating temperature in the step (1) is 60 to 80 ℃, the stirring speed is 300 to 800r/min, the stirring time is 10 to 30min, and the cooling time is 12 to 24h;
preferably, the cooling in the step (1) further comprises grinding and screening, wherein the screening is to screen reversible color-changing materials with the particle size smaller than 100 μm through a standard mesh screen;
preferably, the mixing of step (2) comprises the steps of: heating reversible color-changing material at 65-70 ℃ to dissolve completely, adding gum arabic powder solution 1500-2500 r/min for continuous stirring, cooling to form O/W emulsion, adjusting stirring speed to 250-350 r/min, slowly dripping urea-formaldehyde resin prepolymer solution, finishing dripping for 25-35 min, slowly adding acetic acid solution in batches, firstly adding acetic acid solution to adjust pH to 3.0-3.5, continuously stirring for 15-25 min, adding ammonium chloride solution and nano silicon dioxide, stirring for reacting for 1.5-2.5 h, adding acetic acid solution to adjust pH to 2.5-3.0, heating to 65-70 ℃, stirring for 0.5-1.5 h under 150-250 r/min, cooling, suction filtering, cleaning, filtering cake, and vacuum drying;
preferably, the mixing in the step (3) is stirring and mixing under vacuum condition, the stirring speed is 250-300 r/min, and the stirring time is 15-25 min.
10. A transformer bushing armcap, characterized in that it is coated with a reversible colour-changing coating according to any one of claims 1-7.
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| CN202310375205.7A CN116285694A (en) | 2023-04-10 | 2023-04-10 | Reversible color-changing coating and preparation method and application thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112111189A (en) * | 2020-08-28 | 2020-12-22 | 深圳供电局有限公司 | Preparation method of temperature indicating coating and transformer substation equipment |
| CN114525124A (en) * | 2022-01-25 | 2022-05-24 | 武汉中科先进技术研究院有限公司 | Thermochromic microcapsule coated with silicon dioxide wall material and preparation method thereof |
| CN115926518A (en) * | 2022-12-20 | 2023-04-07 | 国网吉林省电力有限公司电力科学研究院 | Preparation method of coating and patch for early warning and detecting thermal defect of power equipment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112111189A (en) * | 2020-08-28 | 2020-12-22 | 深圳供电局有限公司 | Preparation method of temperature indicating coating and transformer substation equipment |
| CN114525124A (en) * | 2022-01-25 | 2022-05-24 | 武汉中科先进技术研究院有限公司 | Thermochromic microcapsule coated with silicon dioxide wall material and preparation method thereof |
| CN115926518A (en) * | 2022-12-20 | 2023-04-07 | 国网吉林省电力有限公司电力科学研究院 | Preparation method of coating and patch for early warning and detecting thermal defect of power equipment |
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