WO2023027475A1 - 열변색 필름 및 열변색 필름의 제조 방법 - Google Patents
열변색 필름 및 열변색 필름의 제조 방법 Download PDFInfo
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- WO2023027475A1 WO2023027475A1 PCT/KR2022/012572 KR2022012572W WO2023027475A1 WO 2023027475 A1 WO2023027475 A1 WO 2023027475A1 KR 2022012572 W KR2022012572 W KR 2022012572W WO 2023027475 A1 WO2023027475 A1 WO 2023027475A1
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- thermochromic
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- thermochromic film
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- vanadium oxide
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
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- 229910001935 vanadium oxide Inorganic materials 0.000 claims abstract description 36
- 239000010410 layer Substances 0.000 claims abstract description 32
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 claims abstract description 29
- 230000007704 transition Effects 0.000 claims abstract description 24
- 229910021542 Vanadium(IV) oxide Inorganic materials 0.000 claims abstract description 17
- 238000000137 annealing Methods 0.000 claims abstract description 17
- GRUMUEUJTSXQOI-UHFFFAOYSA-N vanadium dioxide Chemical compound O=[V]=O GRUMUEUJTSXQOI-UHFFFAOYSA-N 0.000 claims abstract description 17
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- 238000002834 transmittance Methods 0.000 claims description 24
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- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 11
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- 239000010453 quartz Substances 0.000 claims description 2
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
-
- 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
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- 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
- C09D11/00—Inks
- C09D11/50—Sympathetic, colour changing or similar inks
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
Definitions
- the present invention relates to a thermochromic film and a method for manufacturing the thermochromic film, and more particularly, to a thermochromic film including a thermochromic layer in which a phase transition temperature is changed and a method for manufacturing the thermochromic film using IPL annealing.
- the present invention was carried out by supporting the following tasks.
- thermochromic glass in which a thermochromic layer having thermochromism is coated on the glass to control energy input through infrared transmittance control.
- Thermochromic is a phenomenon in which the color of an oxide or sulfide of a transition metal changes reversibly at a transition temperature (or critical temperature). It is possible to manufacture a thermochromic glass in which near-infrared rays and infrared rays are blocked so that the room temperature does not rise. By using this characteristic, near-infrared light is blocked at high temperatures in summer to suppress an increase in indoor temperature, and light energy from the outside can be brought in at low temperatures in winter. When such thermochromic glass is used for windows and doors of buildings, a great energy saving effect can be expected.
- thermochromic effect Materials exhibiting a thermochromic effect include oxides or sulfides of various transition metals. Among them, studies on the use of vanadium dioxide (VO 2 ) having a transition temperature (phase transition temperature) of 68° C. have been mainly conducted.
- VO 2 vanadium dioxide
- phase transition temperature has been controlled through doping of tungsten, etc., but this doping method causes environmental problems due to complicated processes and processing of residues after the process, and hysteresis characteristics are intensified, so a method for replacing them is required.
- vanadium dioxide can be produced by inducing a phase change of vanadium pentoxide (V 2 O 5 ), conventionally, after applying a solution containing vanadium pentoxide (V 2 O 5 ) to a substrate, A high-temperature heat treatment process was performed to induce a phase change.
- this heat treatment process has a problem of inevitably using an anti-diffusion layer to prevent thermal diffusion even though optical properties are deteriorated and difficult to apply to heat-sensitive substrates such as polymers.
- the present invention can change the phase transition temperature of the thermochromic layer through stress change through a heat-shrinkable substrate, so it can be applied to various fields, and it has economic and environmental advantages because it does not perform a conventional complicated doping process and post-treatment process.
- a thermochromic film capable of inducing a phase change of vanadium oxide without a thermochromic film and a diffusion barrier layer, and capable of producing a thermochromic film even when the substrate is made of a heat-sensitive material such as a polymer substrate.
- the present invention is a substrate having heat shrinkability; and a thermochromic layer formed on the substrate and having a phase transition temperature changed by thermal contraction of the substrate.
- the present invention comprises a forming step of forming a coating layer by applying a solution containing untreated vanadium oxide (VOx) on a substrate; and preparing a thermochromic layer by phase-changing untreated vanadium oxide into vanadium dioxide through annealing using intense pulsed light (IPL).
- VOx untreated vanadium oxide
- IPL intense pulsed light
- thermochromic film according to the present invention has economic and environmental advantages because the phase transition temperature of the thermochromic layer can be changed through a heat-shrinkable substrate without a complicated doping process and post-treatment process.
- thermochromic film As IPL annealing is used, a phase change of vanadium oxide can be induced without an anti-diffusion layer that deteriorates optical properties, and even when the substrate is made of a heat-sensitive material such as a polymer substrate It has the advantage of being able to manufacture a thermochromic film.
- thermochromic film 1 is a view showing the structure of a thermochromic film according to the present invention.
- FIG 2 is a view showing the stress direction during thermal contraction of a substrate according to the present invention.
- 3 is a diagram for easily explaining the shrinkage direction and the stress direction during thermal contraction of the substrate.
- thermochromic film prepared in Example 1 is a graph measuring the transmittance of the thermochromic film prepared in Example 1.
- thermochromic film prepared according to Example 2 is a graph of thermochromic characteristics of the thermochromic film prepared according to Example 2.
- thermochromic film 8 is a graph of thermochromic properties of the thermochromic film prepared in Example 3.
- FIG. 1 is a view showing the structure of a thermochromic film according to the present invention
- FIG. 2 is a view showing the stress direction during thermal contraction of a substrate according to the present invention
- FIG. 3 is a shrinkage direction and stress direction during thermal contraction of a substrate It is a drawing for easy explanation.
- thermochromic film of the present invention includes a substrate 100 and a thermochromic film 200 .
- thermochromic film of the present invention includes a substrate 100 having heat shrinkability; and a thermochromic layer 200 formed on the substrate and having a phase transition temperature changed by thermal contraction of the substrate 100 .
- thermochromic layer 200 When heat is applied to the substrate 100, a contraction characteristic is realized, and the contraction force acts as a stress of the thermochromic layer, so that the phase transition temperature of the thermochromic layer may change.
- the thermochromic layer 200 may generate stress from the edge to the center when the substrate 100 is thermally contracted (see FIG. 2 ).
- the thermal shrinkage rate of the substrate 100 may be about 2%, and at this time, about 2 GPa of stress may occur in the thermochromic layer 200 .
- thermochromic layer 200 may be induced through a change in stress of the substrate 100 to ultimately control thermochromic characteristics of the thermochromic layer 200 .
- the phase transition temperature of the thermochromic layer 200 may be lowered when the substrate 100 is thermally contracted.
- the rate of change of the phase transition temperature depends on the magnitude of stress due to thermal contraction. For example, when the thermal contraction rate of the substrate 100 is 2% and the resulting stress is 2 GPa, the phase transition temperature may decrease by about 10 ° C. there is.
- the base material 100 has a curved surface, and the curvature of the curved surface may be gently deformed during thermal contraction. Referring to FIG. 3 , the edge of the curved surface moves in the B direction during thermal contraction, so that the curvature of the curved surface may be gently deformed. In addition, as the curvature of the curved surface is gently deformed, stress (or also referred to as compressive stress) may be applied to the thermochromic layer 200 formed on the substrate 100 in the A direction.
- stress or also referred to as compressive stress
- the substrate 100 may include a shape memory polymer (SMP).
- SMP shape memory polymer
- a shape memory polymer is a polymer that has the property of returning to its original shape, and it means a polymeric substance that returns to its original form even after the model is changed if the shape is memorized under specific conditions and then the condition is applied again.
- the shape memory polymer has heat shrinkability, and at this time, a specific condition for the shape memory polymer may be to apply heat.
- the glass transition temperature of the shape memory polymer may be 30 ° C or more, 40 ° C or more, 50 ° C or more, 60 ° C or more, 70 ° C or more, 80 ° C or more or 100 or more.
- the type is not particularly limited and may be appropriately selected in consideration of desired physical properties.
- the shape memory polymer may be a urethane-based shape memory polymer. Urethane-based shape memory polymers have the advantage of exhibiting shape memory properties even at low temperatures due to low glass conduction, and thus have excellent handling and processability.
- the thermochromic layer may include vanadium oxide.
- the vanadium oxide may be vanadium dioxide
- the thermochromic layer 200 may include vanadium dioxide clusters.
- vanadium dioxide cluster refers to an aggregate formed by removing an organic solvent in a solution containing vanadium dioxide particles and causing adhesion between vanadium dioxide particles through a sintering process. Since vanadium dioxide (cluster) has thermochromic properties due to phase transition, the present invention can ultimately control the phase transition temperature of the thermochromic layer 200 through the size of the stress of the substrate 100, enabling thermochromic properties to be adjusted do.
- the thickness of the substrate 100 may be in the range of 50 to 200 ⁇ m, but is not particularly limited, and the amount of stress applied to the thermochromic layer can be controlled by adjusting the thickness of the substrate.
- the thermochromic film may have a maximum transmittance of 50% or more in a region of 400 to 800 nm.
- the laminate has a maximum transmittance (P max ) of 50% or more, 55% or more, 60% or more, or 65% or more in the 400 to 800 nm region, and transmittance in the 2000 to 3000 nm region at any temperature above the critical temperature.
- the minimum value (OP min ) may be 70% or less, 60% or less, specifically, 55% or less, 50% or less, or 40% or less.
- thermochromic film may satisfy the condition of Formula 1 below.
- BP min represents the minimum value of transmittance at 2000 to 3000 nm at any temperature below the critical temperature
- OP min represents the minimum value of transmittance at 2000 to 3000 nm at any temperature above the critical temperature.
- the temperature below the critical temperature may be, for example, 20 to 30 °C, specifically 25 °C
- the temperature above the critical temperature may be, for example, 60 to 90 °C, specifically 80 °C.
- the ⁇ IR value (%) is 10% or more, specifically 20% or more, 25% or more, 30% or more, or 35% or more, the effect of blocking/transmitting infrared rays is excellent.
- thermochromic film described above.
- the method may include, for example, applying a thermochromic precursor solution on a substrate having heat shrinkability; and photosintering the thermochromic precursor solution to form a thermochromic layer.
- thermochromic precursor solution may include vanadium oxide.
- This application relates to a method for manufacturing another thermochromic film using IPL annealing.
- the manufacturing method may include a forming step of forming a coating layer by applying a solution containing untreated vanadium oxide (VOx) on a substrate; and preparing a thermochromic layer by phase-changing untreated vanadium oxide into vanadium dioxide through annealing using intense pulsed light (IPL).
- untreated vanadium oxide may be used in a limited sense to indicate vanadium oxide in which a phase change has not occurred.
- the untreated vanadium oxide may exist in the form of particles or ions in a solution, and various known materials that dissolve vanadium oxide may be used as the solvent without limitation.
- various methods such as spin coating, slot die coating, and spray coating may be used for the application.
- thermochromic film even when the substrate is made of a heat-sensitive material such as a polymer substrate.
- the untreated vanadium oxide (VOx) may be vanadium pentoxide (V 2 O 5 ).
- annealing atmosphere for example, annealing atmosphere, type of light, applied voltage (output voltage), pulse width, number of pulses (repetitive irradiation number of light), it is important to establish the pulse interval (frequency) as an optimization.
- the annealing may be performed in a vacuum or air atmosphere.
- the vacuum atmosphere may be a vacuum atmosphere of 1 to 20 Torr.
- various conditions of IPL such as pulse width, pulse interval, and repetition number described later, should be optimized according to vacuum or air atmosphere in order to induce phase change of vanadium oxide, and the annealing Values of the optimized conditions may vary depending on the vacuum atmosphere and the air atmosphere.
- the output voltage of the extreme short wave white light may be in the range of 1500 to 1900V. Phase change effectively occurs as the output voltage increases, but physical transformation of the polymer film may occur, and an appropriate voltage at which physical transformation does not occur may be in the range of 1500 to 1750V.
- the output voltage of the extreme short wave white light may be in the range of 1700 to 2000V.
- the phase change effectively occurs, but physical transformation of the polymer film may occur, and an appropriate voltage at which the physical transformation does not occur may be in the range of 1750 to 1900V.
- the annealing may be repeatedly irradiated with light with a constant pulse interval and pulse width.
- the pulse interval, pulse width, and number of repetitions should be adjusted to an optimized numerical range described below according to the vacuum atmosphere and the air atmosphere.
- the pulse width may be within a range of 1 to 4 ms.
- the pulse interval may be within a range of 0.2 to 1 Hz.
- the average power is determined by the output voltage, pulse width, and pulse interval. However, if the pulse interval is less than 0.2 Hz, the accumulated thermal energy may escape from the bed and phase change may not occur, and if the pulse interval exceeds 1 Hz, the bed temperature may increase rapidly, causing physical deformation of the polymer film.
- the number of repetitions of annealing may be within the range of 20 to 200 times.
- the visible light transmittance and infrared transmittance of the prepared thermochromic layer are improved, but when the number of repetitions exceeds a certain number of times, deformation of the substrate occurs and decreases.
- infrared transmittance is improved up to 200 times, and visible light transmittance and infrared transmittance decrease at 250 times or more.
- the number of repetitions may be 20 to 200 times, 50 to 200 times, 100 to 200 times or about 200 times.
- the pulse width may be within a range of 0.1 to 1 ms, for example, within a range of 0.2 to 1 ms, 0.3 to 1 ms, 0.4 to 1 ms, or 0.5 to 1 ms.
- the pulse interval may be within a range of 1.0 to 3.0 Hz, for example, 1.1 to 3.0 Hz, 1.2 to 3.0 Hz, 1.0 to 2.5 Hz, 1.1 to 2.5 Hz, 1.2 to 2.5 Hz, and 1.0 to 1.0 Hz. It may be in the range of 2.0 Hz, 1.1 to 2.0 Hz or 1.2 to 2.0 Hz.
- the process time may be reduced due to an increase in average power applied per second.
- the average power is determined by the output voltage, pulse width, and pulse interval. However, if the pulse interval is less than 1.0 Hz, the accumulated thermal energy may escape from the bed and phase change may not occur, and if the pulse interval is greater than 3.0 Hz, the bed temperature may rise rapidly, causing physical deformation of the polymer film.
- the number of repetitions of annealing may be within a range of 200 to 400 times.
- the visible light transmittance and infrared transmittance of the prepared thermochromic layer are improved, but when the number of repetitions exceeds a certain number of times, deformation of the substrate occurs and decreases.
- infrared transmittance is improved up to 400 times, and visible light transmittance and infrared transmittance decrease at 450 times or more.
- the number of repetitions may be 200 to 400, 200 to 350, 200 to 300 or about 250 times.
- the type of substrate may be selected from glass, quartz or polymer film.
- the substrate may be selected from a polymer film, and the type of such polymer film is not particularly limited, but polyolefin film (eg cycloolefin, polyethylene, polypropylene, etc.), polyester A film (eg polyethylene terephthalate, polyethylene naphthalate), polyvinyl chloride, or a cellulosic film (eg triacetyl cellulose) may be used.
- the polymer film may include a polymer having a glass transition temperature of 70 °C or higher, 80 °C or higher, 90 °C or higher, 100 °C or higher, 110 °C or higher, or 120 °C or higher.
- the type is not particularly limited and may be appropriately selected in consideration of desired physical properties.
- the polymer film is a polyethylene naphthalate film, excellent heat resistance may be realized.
- the polymer film may be, for example, one that is uniaxially stretched and has a shrinkage rate of less than 3% when exposed to 120° C. for 1 hour.
- a stretched polymer film it can have excellent mechanical strength and can prevent shrinkage at high temperatures.
- a polymer film satisfying these conditions can be arbitrarily selected from known materials and used.
- the thickness of the coating layer and the average particle diameter of untreated vanadium oxide (VO X ) must be controlled within a numerical range or less to induce a phase change of vanadium oxide.
- the coating layer may have a thickness of 10 to 300 nm or less, and an average particle diameter of untreated vanadium oxide (VOX) may be 1 to 40 nm or less.
- VOX vanadium oxide
- the average particle diameter may be an average particle diameter measured according to D50 particle size analysis unless otherwise specified.
- thermochromic film Coating a solution containing vanadium dioxide on a substrate containing a urethane-based shape memory polymer (SMP) on glass in a size of 10 ⁇ 10 mm 2 at 1000 rpm for 30 seconds using a spin coater (ACE-200, Donga Trading, Korea) and dried to prepare a thermochromic film.
- SMP shape memory polymer
- thermochromic film prepared in Example was measured when the temperature was increased from 25 ° C to 80 ° C at 2500 nm using a spectrophotometer (JASCO V-770, JASCO, USA) and then decreased again. shown in Figure 4.
- a spectrophotometer JASCO V-770, JASCO, USA
- glass was used instead of the shape memory polymer.
- phase transition temperature of vanadium dioxide As vanadium dioxide exhibits thermochromic characteristics by phase transition, the temperature at which the transmittance of FIG. 4 changes can be regarded as the phase transition temperature of vanadium dioxide. Therefore, it can be confirmed that the phase transition temperature of vanadium dioxide decreased by 6.4 ° C due to the application of compressive stress when the SMP substrate was used.
- a solution containing vanadium pentoxide was coated on glass in a size of 10 ⁇ 10 mm 2 at 1000 rpm for 30 seconds using a spin coater (ACE-200, Donga Trading, Korea).
- thermochromic film was prepared by IPL treatment at 1900 V, 2 ms, 0.5 Hz, 100 times in a vacuum atmosphere of 1 Torr.
- thermochromic property graph of the thermochromic film prepared according to Example 2 is a thermochromic property graph of the thermochromic film prepared according to Example 2
- FIGS. 6 and 7 are thermochromic property graphs of the thermochromic film prepared as a control of Example 2.
- FIG. 6 is a graph of thermochromic properties of a thermochromic film prepared by drying at room temperature instead of IPL treatment in Example 2
- FIG. 7 is heat treatment at 500 ° C. for 1 hour in a vacuum atmosphere of 1 Torr instead of IPL treatment in Example 2. It is a thermochromic characteristic graph of the thermochromic film prepared by
- thermochromic film dried at room temperature does not undergo a phase change of vanadium oxide, so no thermochromic characteristics are implemented (see FIG. 6), and the thermochromic film subjected to heat treatment undergoes a phase change of vanadium oxide, resulting in thermal discoloration characteristics.
- a solution containing vanadium pentoxide with an average particle diameter of 40 nm or less was coated on glass in a size of 10 ⁇ 10 mm 2 at 1000 rpm for 30 seconds using a spin coater (ACE-200, Donga Trading, Korea), and the thickness of the coating layer was 300 nm. .
- thermochromic film was prepared by IPL treatment at 1750 V, 0.5 ms, 1.2 Hz, 300 times in an air atmosphere.
- thermochromic film 8 is a graph of thermochromic properties of the thermochromic film prepared in Example 3.
- thermochromic film prepared by the IPL treatment according to the present invention in an air atmosphere exhibited the same effect as the thermochromic film subjected to heat treatment due to a phase change.
- thermochromic layer 200: thermochromic layer
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Abstract
Description
Claims (27)
- 열수축성을 갖는 기재; 및상기 기재 상에 형성되고, 기재의 열수축에 의해 상전이 온도가 변화하는 열변색층을 포함하는, 열변색 필름.
- 제 1 항에 있어서, 상기 열변색층은 기재의 열 수축 시, 상전이 온도가 낮아지는, 열변색 필름.
- 제 1 항에 있어서, 상기 기재는 곡면을 갖되, 열 수축 시 곡면의 곡률이 완만하게 변형되는, 열변색 필름.
- 제 1 항에 있어서, 상기 기재는 형상기억고분자(Shape Memory Polymer, SMP)를 포함하는, 열변색 필름.
- 제 4 항에 있어서, 상기 형상기억고분자의 유리전이온도는 30℃ 이상인, 열변색 필름.
- 제 4 항에 있어서, 상기 형상기억고분자는 우렌탄계 형상기억고분자인, 열변색 필름.
- 제 1 항에 있어서, 상기 열변색층은 산화바나듐을 포함하는, 열변색 필름.
- 제 1 항에 있어서, 상기 기재의 두께는 50 내지 200㎛ 범위 내인, 열변색 필름.
- 제 1 항에 있어서, 적층체는 400 내지 800 nm 영역에서 투과도의 최대값이 50% 이상인, 열변색 필름.
- 제 1 항에 있어서,적층체는 임계 온도 이상의 임의의 온도에서 2000 내지 3000nm 영역에서 투과도의 최소값이 70% 이하인 열변색 필름.
- 제 1 항에 있어서,적층체는 하기 일반식 1의 조건을 만족시키는 열변색 필름:[일반식 1]△IR =BPmin - Opmin ≥ 10 %상기 일반식 1에서 BPmin는 임계온도 이하의 임의의 온도에서 2000 내지 3000nm에서 투과도의 최소값을 나타내고, OPmin는 임계온도 이상의 임의의 온도에서 2000 내지 3000nm에서 투과도의 최소값을 나타낸다.
- 미처리된 산화바나듐(VOx)을 포함하는 용액을 기재 상에 도포하여 도포층을 형성하는 형성 단계; 및극단파 백색광(intense pulsed light, IPL)을 이용한 어닐링을 통해 미처리된 산화바나듐(VOx)을 이산화바나듐(VO2)으로 상변화시켜 열변색층을 제조하는 제조 단계;를 포함하는, 열변색 필름의 제조 방법.
- 제 12 항에 있어서, 상기 미처리된 산화바나듐(VOx)은 오산화바나듐(V2O5)인, 열변색 필름의 제조 방법.
- 제 12 항에 있어서, 상기 어닐링은 진공 또는 대기 분위기에서 수행하는, 열변색 필름의 제조 방법.
- 제 14 항에 있어서, 진공 분위기에서, 극단파 백색광의 출력 전압은 1500 내지 1900V 범위 내인, 열변색 필름의 제조 방법.
- 제 14 항에 있어서, 대기 분위기에서, 극단파 백색광의 출력 전압은 1700 내지 2000V 범위 내인, 열변색 필름의 제조 방법.
- 제 14 항에 있어서, 어닐링은 일정한 펄스 간격 및 펄스 폭을 갖고 반복적으로 광 조사하는, 열변색 필름의 제조 방법.
- 제 16 항에 있어서, 진공 분위기에서, 상기 펄스 폭은 1 내지 4ms 범위 내인, 열변색 필름의 제조 방법.
- 제 16 항에 있어서, 진공 분위기에서, 상기 펄스 간격은 0.2 내지 1Hz 범위 내인, 열변색 필름의 제조 방법.
- 제 16 항에 있어서, 진공 분위기에서, 반복 횟수는 20 내지 200회 범위 내인, 열변색 필름의 제조 방법.
- 제 16 항에 있어서, 대기 분위기에서, 상기 펄스 폭은 0.1 내지 1ms 이하인, 열변색 필름의 제조 방법.
- 제 16 항에 있어서, 대기 분위기에서, 상기 펄스 간격은 1.0 내지 3.0Hz 범위 내인, 열변색 필름의 제조 방법.
- 제 16 항에 있어서, 대기 분위기에서, 반복 횟수는 200회 내지 400회 범위 내인, 열변색 필름의 제조 방법.
- 제 12 항에 있어서, 상기 기재는 유리, 석영 또는 고분자 필름인 열변색 필름의 제조 방법.
- 제 24 항에 있어서, 고분자 필름은 유리전이 온도가 70℃ 이상인 고분자를 포함하는 열변색 필름의 제조 방법.
- 제 12 항에 있어서, 도포층의 두께는 10 내지 300nm 이하인, 열변색 필름의 제조 방법.
- 제 12 항에 있어서, 미처리된 산화 바나듐(VOX)의 평균 입경은 1 내지 40nm 이하인 열변색 필름의 제조 방법.
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KR1020210111011A KR20230029026A (ko) | 2021-08-23 | 2021-08-23 | 열변색 필름의 제조 방법 |
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Citations (5)
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KR100605289B1 (ko) * | 2006-04-06 | 2006-07-28 | 송건화 | 이산화바나듐 막의 제조방법 및 그 막을 구비한 정온온도스위치 |
KR20130108744A (ko) * | 2012-03-26 | 2013-10-07 | 전자부품연구원 | 그래핀 기반 vo2 적층체의 상전이 온도 제어 방법 |
JP2019111887A (ja) * | 2017-12-22 | 2019-07-11 | 小島プレス工業株式会社 | 車両ウインドウ用積層体 |
KR20210043547A (ko) * | 2018-09-21 | 2021-04-21 | 한국생산기술연구원 | 광증발 및 광소결 조건을 제어하여 우수한 광특성을 가지는 열변색층을 포함하는 광학 적층체의 제조 방법 |
KR20210055879A (ko) * | 2019-11-08 | 2021-05-18 | 중앙대학교 산학협력단 | 스마트 윈도우용 vo2 필름 제조 방법 |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100605289B1 (ko) * | 2006-04-06 | 2006-07-28 | 송건화 | 이산화바나듐 막의 제조방법 및 그 막을 구비한 정온온도스위치 |
KR20130108744A (ko) * | 2012-03-26 | 2013-10-07 | 전자부품연구원 | 그래핀 기반 vo2 적층체의 상전이 온도 제어 방법 |
JP2019111887A (ja) * | 2017-12-22 | 2019-07-11 | 小島プレス工業株式会社 | 車両ウインドウ用積層体 |
KR20210043547A (ko) * | 2018-09-21 | 2021-04-21 | 한국생산기술연구원 | 광증발 및 광소결 조건을 제어하여 우수한 광특성을 가지는 열변색층을 포함하는 광학 적층체의 제조 방법 |
KR20210055879A (ko) * | 2019-11-08 | 2021-05-18 | 중앙대학교 산학협력단 | 스마트 윈도우용 vo2 필름 제조 방법 |
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