KR20240040867A - Electrochromic device and window apparatus comprising the same - Google Patents

Abstract

Examples include a first substrate; a first transparent electrode disposed on the first substrate; a first discoloring layer disposed on the first transparent electrode; An electrolyte layer disposed on the first discoloration layer; a second discoloration layer disposed on the electrolyte layer; a second transparent electrode disposed on the second discoloration layer; and a second substrate disposed on the second transparent electrode, and the electrochromic device has a color transmittance deviation of less than 0.4 after a winding test.

Description

Electrochromic device and window apparatus comprising the same}

Embodiments relate to electrochromic devices and window devices including the same.

Electrochromic film is a film whose color changes due to coloring and decolorization due to oxidation-reduction reactions at each anode and cathode due to an applied potential. It is a film that allows the user to artificially control visible light and infrared light, and is available in a variety of types. Inorganic oxides are used as electrode materials.

Various electrochromic films as described above have been developed and applied for patents. Looking at the contents of the patent applications, Korea Patent Publication No. 2001-0087586 discloses a film in which a conductive indium-tin oxide thin film is deposited on a glass film. MoO3, a reduced color oxide, is deposited on one of the two ITO films (1A, 1B), and WO3, a reduced color oxide, is deposited on the other, and then a lithium-based solid electrolyte, an alkali metal, is deposited on it. Polyaniline, a conductive polymer, is put between the two sheets and passed through a high-frequency compression roller to produce a film that changes from transparent to blue when voltage is applied. In Domestic Registered Utility Model Publication No. 0184841, indium-tinoxide is deposited on a 0.05 mm thick glass film. After that, the electrical energy is characterized in that it is combined with a high-frequency roller on both sides of the transition metal oxide film on which WO ₃ , a reduced coloring material, and IrO ₂ , an oxidized coloring material, are deposited with α-PEO copolymer, a polymer solid electrolyte, in between. A discoloring film is known.

Examples provide an electrochromic element having high thickness uniformity, improved mechanical strength, improved peel strength, excellent appearance, low electrolyte leakage, and deformation resistance against mechanical shock, and a window device including the same. We would like to provide

An electrochromic device according to an embodiment includes a first substrate; a first transparent electrode disposed on the first substrate; a first discoloring layer disposed on the first transparent electrode; An electrolyte layer disposed on the first discoloration layer; a second discoloration layer disposed on the electrolyte layer; a second transparent electrode disposed on the second discoloration layer; and a second substrate disposed on the second transparent electrode, and the coloring transmittance deviation after the winding test measured by the measurement method below is less than 0.4.

[measurement method]

1) The electrochromic element is cut to a size of 4 m in length and 0.5 m in width.

2) One end of the electrochromic element is fixed to a first core with a diameter of 15 cm.

3) The fixed electrochromic element is wound around the first core at a speed of 6 revolutions per minute while maintaining a tension of 10N.

4) While wound around the first core, the electrochromic element is left for 24 hours at a temperature of 85° C. and a relative humidity of about 50%.

5) The other end of the left electrochromic element is fixed to a second core with a diameter of 15 cm.

6) The electrochromic element wound around the first core is wound around the second core at a speed of 6 revolutions per minute while maintaining a tension of 10N, in a direction opposite to the direction in which it is wound around the first core. all.

7) In the state wound around the second core, the electrochromic element is left at a temperature of 85° C. and a relative humidity of about 50% for 24 hours, and the winding test is completed.

8) In the electrochromic device that has undergone the above winding test, a central region of 3 m in length and 0.4 m in width is defined.

9) The central area is cut into measurement areas of 10 cm x 10 cm, and multiple samples are obtained.

10) A driving voltage is applied to the first transparent electrode and the second transparent electrode included in the samples, and the samples are colored.

11) The first transmittance of the colored samples is measured.

12) The coloring transmittance deviation is the difference between the maximum first transmittance and the minimum first transmittance among the first transmittances of the samples divided by the average first transmittance of the samples.

In an electrochromic device according to an embodiment, the discoloration transmittance deviation after the winding test measured by the measurement method below may be less than 0.2.

[measurement method]

A driving voltage is applied to the colored samples in the reverse direction to decolorize the colored samples. In the decolorized samples, each second transmittance is measured, and the decolorizing transmittance deviation is one of the second transmittances of the samples. It is the difference between the maximum second transmittance and the minimum second transmittance divided by the average second transmittance of the samples.

In one embodiment, the haze deviation after the winding test measured by the measurement method below may be less than 0.2.

[measurement method]

In the electrochromic device that has undergone the winding test, the haze of each of the samples is measured, and the haze deviation is the difference between the maximum haze and the minimum haze among the hazes of the samples divided by the average haze of the samples.

In one embodiment, the electrolyte layer includes a curable resin composition, a solvent, and a metal salt, and the thickness of the electrolyte layer may be greater than 50 μm.

In the electrochromic device according to one embodiment, the operating range deviation after the winding test measured by the measurement method below may be less than 0.2.

[measurement method]

In the electrochromic device that has undergone the winding test, the operating range in the samples is the difference between the first transmittance and the second transmittance in the samples, and the operating range deviation is the maximum operating range and minimum operating range in the samples. It is the difference in range of motion divided by the average range of motion.

In one embodiment, the curable resin composition may include a photo-curable polymer having a thermosetting functional group.

In one embodiment, the first substrate has a modulus of 200 kgf/mm2 to 400 kgf/mm2 in the first direction, and the second substrate has a modulus of 200 kgf/mm2 to 400 kgf/mm2 in the first direction. It can have a modulus of /㎟.

In one embodiment, the first substrate may have an elongation at break of 30% to 150% in the first direction, and the second substrate may have an elongation at break of 30% to 150% in the first direction.

In one embodiment, the average first transmittance may be 5% to 40%.

In one embodiment, the average second transmittance may be 40% to 80%.

A window device according to an embodiment includes a frame; a window mounted on the frame; and an electrochromic element disposed in the window, wherein the electrochromic element includes: a first substrate; a first transparent electrode disposed on the first substrate; a first discoloring layer disposed on the first transparent electrode; An electrolyte layer disposed on the first discoloration layer; a second discoloration layer disposed on the electrolyte layer; a second transparent electrode disposed on the second discoloration layer; and a second substrate disposed on the second transparent electrode, and the coloring transmittance deviation after the winding test measured by the measurement method below is less than 0.4.

[measurement method]

1) The electrochromic element is cut to a size of 4 m in length and 0.5 m in width.

2) One end of the electrochromic element is fixed to a first core with a diameter of 20 cm.

3) The fixed electrochromic element is wound around the first core at a speed of 6 revolutions per minute while maintaining a tension of 10N.

4) While wound around the first core, the electrochromic element is left for 24 hours at a temperature of 85° C. and a relative humidity of about 50%.

5) The other end of the left electrochromic element is fixed to a second core with a diameter of 20 cm.

6) The electrochromic element wound around the first core is wound around the second core at a speed of 6 revolutions per minute while maintaining a tension of 10N, in a direction opposite to the direction in which it is wound around the first core. all.

7) In the state wound around the second core, the electrochromic element is left at a temperature of 85° C. and a relative humidity of about 50% for 24 hours, and the winding test is completed.

8) In the electrochromic device that has undergone the above winding test, a central region of 3 m in length and 0.4 m in width is defined.

9) The central area is cut into measurement areas of 10 cm x 10 cm, and multiple samples are obtained.

10) A driving voltage is applied to the first transparent electrode and the second transparent electrode included in the samples, and the samples are colored.

11) The first transmittance of the colored samples is measured.

12) The coloring transmittance deviation is the difference between the maximum first transmittance and the minimum first transmittance among the first transmittances of the samples divided by the average first transmittance of the samples.

The electrochromic device according to the embodiment has an appropriate coloring transmittance deviation after the winding test. In other words, the electrochromic device according to the embodiment is flexible and can prevent performance degradation against a certain degree of mechanical deformation such as winding.

Even if mechanical deformation, such as winding, is applied to the electrochromic device according to the embodiment by an external force, the electrochromic device according to the embodiment may have uniform optical characteristics as a whole.

Accordingly, after an external mechanical strain is applied to the electrochromic device according to the embodiment, when it is restored, it may have uniform coloring transmittance, decolorizing transmittance, and haze as a whole.

In particular, in the electrochromic device according to the embodiment, the electrolyte layer may have a thickness of about 30 μm or more. Accordingly, the electrochromic device according to the embodiment can have a buffering function of the electrolyte layer even in response to external mechanical shock. At the same time, the electrochromic device according to the embodiment can simultaneously have appropriate flexibility.

Accordingly, the electrochromic device according to the embodiment can minimize changes in appearance due to pressing and/or bending, and maintain color changing performance. Additionally, since the electrochromic device according to the embodiment has fast restoration performance, it may have an improved appearance.

Additionally, the electrolyte layer may be formed by a thermal crosslinking process and a photocuring process of the curable resin. Accordingly, the electrolyte layer can have a high crosslinking density.

Accordingly, the electrolyte layer can be strongly bonded to the first discoloration layer and the second discoloration layer. Accordingly, the electrochromic device according to the embodiment may have improved peel strength.

Additionally, because the electrolyte layer has an improved crosslinking density, the electrochromic device according to the embodiment can prevent leakage of the electrolyte contained in the electrolyte layer. In addition, even if the electrochromic device according to the embodiment is twisted, the electrolyte layer has appropriate bonding strength and elasticity, so coloring transmittance deviation that may occur due to peeling, etc. can be reduced.

Accordingly, the electrochromic device according to the embodiment can have uniform performance even if it is manufactured in a mass production process such as a roll-to-roll process. Accordingly, the electrochromic device according to the embodiment can be easily manufactured while having improved performance.

1 is a cross-sectional view showing a cross-section of an electrochromic device according to an embodiment.
Figures 2 to 5 are diagrams showing the process of manufacturing an electrochromic device according to an embodiment.
Figures 6 and 7 are diagrams showing a process in which an electrochromic device according to an embodiment undergoes a winding test.
Figure 8 is a diagram illustrating a process of measuring the transmittance deviation after a winding test of an electrochromic device according to an embodiment is performed.
Figure 9 is a diagram illustrating a window device according to an embodiment.

In the description of the embodiment, when each part, surface, layer, or substrate is described as being formed “on” or “under” each part, surface, layer, or substrate, “On” and “under” include those formed “directly” or “indirectly” through other elements. In addition, the standards for the top or bottom of each component are explained based on the drawings. The size of each component in the drawings may be exaggerated for explanation and does not indicate the actual size.

1 is a cross-sectional view showing a cross-section of an electrochromic device according to an embodiment.

Referring to FIG. 1, the electrochromic device according to the embodiment includes a first substrate 100, a second substrate 200, a first transparent electrode 300, a second transparent electrode 400, and a first color change layer 500. ), a second discoloration layer 600, and an electrolyte layer 700.

The first substrate 100, together with the second substrate 200, includes the first transparent electrode 300, the first color changing layer 500, the second color changing layer 600, and the second transparent electrode. (400) and supports the electrolyte layer (700).

In addition, the first substrate 100, together with the second substrate 200, includes the first transparent electrode 300, the first color change layer 500, the second color change layer 600, and the second transparent electrode 300. The electrode 400 and the electrolyte layer 700 are sandwiched. The first substrate 100, together with the second substrate 200, includes the first transparent electrode 300, the first color changing layer 500, the second color changing layer 600, and the second transparent electrode ( 400) and the electrolyte layer 700 can be protected from external physical and chemical shock.

The first substrate 100 may include polymer resin. The first substrate 100 may include at least one from the group consisting of polyester-based resin, polyimide-based resin, cyclic olefin polymer resin, polyethersulfone, polycarbonate, or polyolefin-based resin.

The first substrate 100 may include polyester resin as a main component. The first substrate 100 may include polyethylene terephthalate. The first substrate 100 may contain polyethylene terephthalate in an amount of about 90 wt% or more based on the total composition. The first substrate 100 may contain polyethylene terephthalate in an amount of about 95 wt% or more based on the total composition. The first substrate 100 may contain polyethylene terephthalate in an amount of about 97 wt% or more based on the total composition. The first substrate 100 may contain polyethylene terephthalate in an amount of about 98 wt% or more based on the total composition.

The first substrate 100 may include a uniaxially or biaxially stretched polyethylene terephthalate film. The first substrate 100 may include a polyethylene terephthalate film stretched about 2 to about 5 times in the longitudinal direction and/or the width direction.

The first substrate 100 may have high mechanical properties to reinforce the glass when applied to the windows of a building or vehicle.

The first substrate 100 may have a tensile strength of about 7 kgf/mm2 to about 40 kgf/mm2 in the longitudinal direction. The first substrate 100 may have a tensile strength of about 8 kgf/mm2 to about 35 kgf/mm2 in the longitudinal direction. It may have a tensile strength of about 10 kgf/mm2 to about 30 kgf/mm2 in the longitudinal direction.

The first substrate 100 may have a tensile strength of about 7 kgf/mm2 to about 40 kgf/mm2 in the width direction. The first substrate 100 may have a tensile strength of about 8 kgf/mm2 to about 35 kgf/mm2 in the width direction. The first substrate 100 may have a tensile strength of about 10 kgf/mm2 to about 30 kgf/mm2 in the width direction.

The first substrate 100 may have a modulus of about 200 kgf/mm2 to about 400 kgf/mm2 in the longitudinal direction. The first substrate 100 may have a modulus of about 250 kgf/mm2 to about 350 kgf/mm2 in the longitudinal direction. The first substrate 100 may have a modulus of about 250 kgf/mm2 to about 270 kgf/mm2 in the longitudinal direction.

The first substrate 100 may have a modulus of about 200 kgf/mm2 to about 400 kgf/mm2 in the width direction. The first substrate 100 may have a modulus of about 250 kgf/mm2 to about 350 kgf/mm2 in the width direction. The first substrate 100 may have a modulus of about 250 kgf/mm2 to about 270 kgf/mm2 in the width direction.

The first substrate 100 may have an elongation at break of about 30% to about 150% in the longitudinal direction. The first substrate 100 may have an elongation at break of about 30% to about 130% in the longitudinal direction. The first substrate 100 may have an elongation at break of about 40% to about 120% in the longitudinal direction.

The first substrate 100 may have an elongation at break of about 30% to about 150% in the longitudinal direction. The first substrate 100 may have an elongation at break of about 30% to about 130% in the longitudinal direction. The first substrate 100 may have an elongation at break of about 40% to about 120% in the longitudinal direction.

The first substrate 100 may have an elongation at break of about 30% to about 150% in the width direction. The first substrate 100 may have an elongation at break of about 30% to about 130% in the width direction. The first substrate 100 may have an elongation at break of about 40% to about 120% in the width direction.

The modulus, the elongation at break and the tensile strength can be measured according to KS B 5521.

Additionally, the modulus, tensile strength, and elongation at break can be measured by ASTM D882.

Because the first substrate 100 has the improved mechanical strength as described above, the first transparent electrode 300, the second transparent electrode 400, the first color change layer 500, and the second color change layer (600) and the electrolyte layer 700 can be efficiently protected. Additionally, because the first substrate 100 has improved mechanical strength as described above, it can efficiently reinforce the mechanical strength of the glass to which it is to be attached. Additionally, because the first substrate 100 has improved mechanical strength as described above, the electrochromic device according to the embodiment can have appropriate flexibility.

Additionally, the first substrate 100 may have high chemical resistance. Accordingly, even if the electrolyte contained in the electrolyte leaks to the first substrate 100, damage to the surface of the first substrate 100 can be minimized.

The first substrate 100 may have improved optical properties. The total light transmittance of the first substrate 100 may be about 55% or more. The total light transmittance of the first substrate 100 may be about 70% or more. The total light transmittance of the first substrate 100 may be about 75% to about 99%. The total light transmittance of the first substrate 100 may be about 80% to about 99%.

The haze of the first substrate 100 may be about 20% or less. It may be about 0.1% to about 20%. The haze of the first substrate 100 may be about 0.1% to about 10%. The haze of the first substrate 100 may be about 0.1% to about 7%.

The total light transmittance and the haze can be measured by ASTM D 1003, etc.

Since the first substrate 100 has appropriate total light transmittance and haze, the electrochromic device according to the embodiment can have improved optical properties. That is, because the first substrate 100 has appropriate transmittance and haze, the electrochromic device according to the embodiment is applied to the window, appropriately adjusting the transmittance, minimizing distortion of the image from the outside, and improving appearance. You can have

Additionally, the first substrate 100 may have an in-plane retardation of about 100 nm to about 4000 nm. The first substrate 100 may have an in-plane retardation of about 200 nm to about 3500 nm. The first substrate 100 may have an in-plane retardation of about 200 nm to about 3000 nm.

The first substrate 100 may have an in-plane retardation of about 7000 nm or more. The first substrate 100 may have an in-plane retardation of about 7000 nm to about 50000 nm. The first substrate 100 may have an in-plane retardation of about 8000 nm to about 20000 nm.

The in-plane phase difference can be derived from the refractive index and thickness depending on the direction of the first substrate 100.

Since the first substrate 100 has the above-described in-plane retardation, the electrochromic film according to the embodiment may have an improved appearance.

The thickness of the first substrate 100 may be about 10 μm to about 200 μm. The thickness of the first substrate 100 may be about 23㎛ to about 150㎛. The thickness of the first substrate 100 may be about 30 μm to about 120 μm.

The first substrate 100 may include organic or inorganic filler. The organic or inorganic filler may function as an anti-blocking agent.

The average particle diameter of the filler may be about 0.1 μm to about 5 μm. The average particle diameter of the filler may be about 0.1 μm to about 3 μm. The average particle diameter of the filler may be about 0.1 μm to about 1 μm.

The filler may be selected from at least one group consisting of silica particles, barium sulfate particles, alumina particles, or titania particles.

Additionally, the filler may be included in the first substrate 100 in an amount of about 0.01 wt% to about 3 wt% based on the entire first substrate 100. The filler may be included in the first substrate 100 in an amount of about 0.05 wt% to about 2 wt% based on the entire first substrate 100.

The first substrate 100 may have a single-layer structure. For example, the first substrate 100 may be a single-layer polyester film.

The first substrate 100 may have a multilayer structure. For example, the first substrate 100 may be a multilayer co-extruded film. The multilayer coextruded structure may include a center layer, a first surface layer, and a second surface layer. The filler may be included in the first surface layer and the second surface layer.

The second substrate 200 faces the first substrate 100. The second substrate 200 is disposed on the first substrate 100. One end 11 of the second substrate 200 may be arranged to be offset from one end 11 of the first substrate 100 . The other end 12 of the second substrate 200 may be arranged to be offset from the other end 12 of the first substrate 100.

The second substrate 200 includes the first substrate 100, the first transparent electrode 300, the first color changing layer 500, the second color changing layer 600, and the second transparent electrode. (400) and supports the electrolyte layer (700).

In addition, the second substrate 200, together with the first substrate 100, includes the first transparent electrode 300, the first color changing layer 500, the second color changing layer 600, and the second transparent electrode 300. The electrode 400 and the electrolyte layer 700 are sandwiched. The second substrate 200, together with the first substrate 100, includes the first transparent electrode 300, the first color changing layer 500, the second color changing layer 600, and the second transparent electrode ( 400) and the electrolyte layer 700 can be protected from external physical and chemical shock.

The second substrate 200 may include polymer resin. The second substrate 200 may include at least one from the group consisting of polyester-based resin, polyimide-based resin, cyclic olefin polymer resin, polyethersulfone, polycarbonate, or polyolefin-based resin.

The second substrate 200 may include polyester resin as a main component. The second substrate 200 may include polyethylene terephthalate. The second substrate 200 may contain polyethylene terephthalate in an amount of about 90 wt% or more based on the total composition. The second substrate 200 may contain polyethylene terephthalate in an amount of about 95 wt% or more based on the total composition. The second substrate 200 may contain polyethylene terephthalate in an amount of about 97 wt% or more based on the total composition. The second substrate 200 may contain polyethylene terephthalate in an amount of about 98 wt% or more based on the total composition.

The second substrate 200 may include a uniaxially or biaxially stretched polyethylene terephthalate film. The second substrate 200 may include a polyethylene terephthalate film stretched about 2 to about 5 times in the longitudinal direction and/or the width direction.

The second substrate 200 may have high mechanical properties to reinforce the glass when applied to the windows of a building or vehicle.

The second substrate 200 may have a tensile strength of about 7 kgf/mm2 to about 40 kgf/mm2 in the longitudinal direction. The second substrate 200 may have a tensile strength of about 8 kgf/mm2 to about 35 kgf/mm2 in the longitudinal direction. The second substrate 200 may have a tensile strength of about 10 kgf/mm2 to about 30 kgf/mm2 in the longitudinal direction.

The second substrate 200 may have a tensile strength of about 7 kgf/mm2 to about 40 kgf/mm2 in the width direction. The second substrate 200 may have a tensile strength of about 8 kgf/mm2 to about 35 kgf/mm2 in the width direction. The second substrate 200 may have a tensile strength of about 10 kgf/mm2 to about 30 kgf/mm2 in the width direction.

The second substrate 200 may have a modulus of about 200 kgf/mm2 to about 400 kgf/mm2 in the longitudinal direction. The second substrate 200 may have a modulus of about 250 kgf/mm2 to about 350 kgf/mm2 in the longitudinal direction. The second substrate 200 may have a modulus of about 250 kgf/mm2 to about 270 kgf/mm2 in the longitudinal direction.

The second substrate 200 may have a modulus of about 200 kgf/mm2 to about 400 kgf/mm2 in the width direction. The second substrate 200 may have a modulus of about 250 kgf/mm2 to about 350 kgf/mm2 in the width direction. The second substrate 200 may have a modulus of about 250 kgf/mm2 to about 270 kgf/mm2 in the width direction.

The second substrate 200 may have an elongation at break of about 30% to about 150% in the longitudinal direction. The second substrate 200 may have an elongation at break of about 30% to about 130% in the longitudinal direction. The second substrate 200 may have an elongation at break of about 40% to about 120% in the longitudinal direction.

The second substrate 200 may have an elongation at break of about 30% to about 150% in the longitudinal direction. The second substrate 200 may have an elongation at break of about 30% to about 130% in the longitudinal direction. The second substrate 200 may have an elongation at break of about 40% to about 120% in the longitudinal direction.

The second substrate 200 may have an elongation at break of about 30% to about 150% in the width direction. The second substrate 200 may have an elongation at break of about 30% to about 130% in the width direction. The second substrate 200 may have an elongation at break of about 40% to about 120% in the width direction.

Because the second substrate 200 has the improved mechanical strength as described above, the first transparent electrode 300, the second transparent electrode 400, the first color changing layer 500, and the second color changing layer (600) and the electrolyte layer 700 can be efficiently protected. Additionally, because the second substrate 200 has improved mechanical strength as described above, it can efficiently reinforce the mechanical strength of the glass to which it is to be attached. Additionally, because the second substrate 200 has improved mechanical strength as described above, the electrochromic device according to the embodiment can have appropriate flexibility.

Additionally, the second substrate 200 may have high chemical resistance. Accordingly, even if the electrolyte contained in the electrolyte leaks to the second substrate 200, damage to the surface of the second substrate 200 can be minimized.

The second substrate 200 may have improved optical properties. The total light transmittance of the second substrate 200 may be about 55% or more. The total light transmittance of the second substrate 200 may be about 70% or more. The total light transmittance of the second substrate 200 may be about 75% to about 99%. The total light transmittance of the second substrate 200 may be about 80% to about 99%.

The haze of the second substrate 200 may be about 20% or less. It may be about 0.1% to about 20%. The haze of the second substrate 200 may be about 0.1% to about 10%. The haze of the second substrate 200 may be about 0.1% to about 7%.

Since the second substrate 200 has appropriate total light transmittance and haze, the electrochromic device according to the embodiment can have improved optical properties. That is, because the second substrate 200 has appropriate transmittance and haze, the electrochromic device according to the embodiment is applied to the window, appropriately adjusting the transmittance, minimizing distortion of the image from the outside, and improving appearance. You can have

Additionally, the second substrate 200 may have an in-plane retardation of about 100 nm to about 4000 nm. The second substrate 200 may have an in-plane retardation of about 200 nm to about 3500 nm. The second substrate 200 may have an in-plane retardation of about 200 nm to about 3000 nm.

The second substrate 200 may have an in-plane retardation of about 7000 nm or more. The second substrate 200 may have an in-plane retardation of about 7000 nm to about 50000 nm. The second substrate 200 may have an in-plane retardation of about 8000 nm to about 20000 nm.

The in-plane phase difference can be derived from the refractive index and thickness depending on the direction of the second substrate 200.

Since the second substrate 200 has the above-described in-plane retardation, the electrochromic device according to the embodiment may have an improved appearance.

The thickness of the second substrate 200 may be about 10 μm to about 200 μm. The thickness of the first substrate 100 may be about 23 μm to about 150 μm. The thickness of the first substrate 100 may be about 30 μm to about 120 μm.

The second substrate 200 may include organic or inorganic filler. The organic or inorganic filler may function as an anti-blocking agent.

The average particle diameter of the filler may be about 0.1 μm to about 5 μm. The average particle diameter of the filler may be about 0.1 μm to about 3 μm. The average particle diameter of the filler may be about 0.1 μm to about 1 μm.

The filler may be selected from at least one group consisting of silica particles, barium sulfate particles, alumina particles, or titania particles.

Additionally, the filler may be included in the second substrate 200 in an amount of about 0.01 wt% to about 3 wt% based on the entire second substrate 200. The filler may be included in the second substrate 200 in an amount of about 0.05 wt% to about 2 wt% based on the entire second substrate 200.

The second substrate 200 may have a single-layer structure. For example, the second substrate 200 may be a single-layer polyester film.

The second substrate 200 may have a multilayer structure. For example, the second substrate 200 may be a multilayer co-extruded film.

The first substrate 100 and the second substrate 200 may be flexible. Accordingly, the electrochromic device according to the embodiment may be flexible as a whole.

The first transparent electrode 300 is disposed on the first substrate 100. The first transparent electrode 300 may be formed by depositing on the first substrate 100. Additionally, a hard coating layer may be further included between the first transparent electrode 300 and the first substrate 100.

The first transparent electrode 300 is made of tin oxide, zinc oxide, silver (Ag), chromium (Cr), indium tin oxide (ITO), fluorine doped tin oxide (FTO), and aluminum. Aluminum doped Zinc Oxide (AZO), Gallium doped Zinc Oxide (GZO), Antimony doped Tin Oxide (ATO), Indium zinc oxide (IZO), It may include at least one from the group consisting of Niobium doped Titanium Oxide (NTO) or Cadmium Tin Oxide (CTO).

Additionally, the first transparent electrode 300 may include graphene, silver nanowire, and/or metal mesh.

The first transparent electrode 300 may have a total light transmittance of about 80% or more. The first transparent electrode 300 may have a total light transmittance of about 85% or more. The first transparent electrode 300 may have a total light transmittance of about 88% or more.

The first transparent electrode 300 may have a haze of about 10% or less. The first transparent electrode 300 may have a haze of about 7% or less. The first transparent electrode 300 may have a haze of about 5% or less.

The sheet resistance of the first transparent electrode 300 may be about 1Ω/sq to 60Ω/sq. The sheet resistance of the first transparent electrode 300 may be about 1Ω/sq to 40Ω/sq. The sheet resistance of the first transparent electrode 300 may be about 1Ω/sq to 30Ω/sq.

The thickness of the first transparent electrode 300 may be about 50 nm to about 50 μm. The thickness of the first transparent electrode 300 may be about 100 nm to about 10 μm. The thickness of the first transparent electrode 300 may be about 150 nm to about 5 μm.

The first transparent electrode 300 is electrically connected to the first color change layer 500. Additionally, the first transparent electrode 300 is electrically connected to the electrolyte layer 700 through the first discoloration layer 500.

The second transparent electrode 400 is disposed below the second substrate 200. The second transparent electrode 400 may be formed by depositing on the second substrate 200. Additionally, a hard coating layer may be further included between the second transparent electrode 400 and the second substrate 200.

The second transparent electrode 400 is made of tin oxide, zinc oxide, silver (Ag), chromium (Cr), indium tin oxide (ITO), fluorine doped tin oxide (FTO), and aluminum. Aluminum doped Zinc Oxide (AZO), Gallium doped Zinc Oxide (GZO), Antimony doped Tin Oxide (ATO), Indium zinc oxide (IZO), It may include at least one from the group consisting of Niobium doped Titanium Oxide (NTO) or Cadmium Tin Oxide (CTO).

Additionally, the second transparent electrode 400 may include graphene, silver nanowire, and/or metal mesh.

The second transparent electrode 400 may have a total light transmittance of about 80% or more. The second transparent electrode 400 may have a total light transmittance of about 85% or more. The second transparent electrode 400 may have a total light transmittance of about 88% or more.

The second transparent electrode 400 may have a haze of about 10% or less. The second transparent electrode 400 may have a haze of about 7% or less. The second transparent electrode 400 may have a haze of about 5% or less.

The sheet resistance of the second transparent electrode 400 may be about 1Ω/sq to 60Ω/sq. The sheet resistance of the second transparent electrode 400 may be about 1Ω/sq to 40Ω/sq. The sheet resistance of the second transparent electrode 400 may be about 1Ω/sq to 30Ω/sq.

The thickness of the second transparent electrode 400 may be about 50 nm to about 50 μm. The thickness of the second transparent electrode 400 may be about 100 nm to about 10 μm. The thickness of the second transparent electrode 400 may be about 150 nm to about 5 μm.

The second transparent electrode 400 is electrically connected to the second color change layer 600. Additionally, the second transparent electrode 400 is electrically connected to the electrolyte layer 700 through the second discoloration layer 600.

The first discoloration layer 500 is disposed on the first transparent electrode 300. The first discoloration layer 500 may be placed directly on the upper surface of the first transparent electrode 300. The first discoloration layer 500 may be directly electrically connected to the first transparent electrode 300.

The first discoloration layer 500 is electrically connected to the first transparent electrode 300. The first discoloration layer 500 may be directly connected to the first transparent electrode 300. Additionally, the first discoloration layer 500 is electrically connected to the electrolyte layer 700. The first discoloration layer 500 may be electrically connected to the electrolyte layer 700.

The first color changing layer 500 may change color by receiving electrons. The first color changing layer 500 may include a first electrochromic material that changes color when supplied with electrons. The first electrochromic material is tungsten oxide, niobium pentaoxide, vanadium pentaoxide, titanium oxide, molybdenum oxide, vilogen, or poly(3,4-ethylenedioxythiophene). ;PEDOT) may include at least one from the group.

The first color changing layer 500 may include the first electrochromic material in particle form. The tungsten oxide, niobium pentaoxide, vanadium pentaoxide, titanium oxide, and molybdenum oxide may be particles having a particle size of about 1 nm to about 200 nm. That is, the diameter of the first electrochromic particles included in the first color changing layer 500 may be about 2 nm to about 150 nm. The diameter of the first electrochromic particles included in the first color changing layer 500 may be about 5 nm to about 100 nm. The diameter of the first electrochromic particles included in the first color changing layer 500 may be about 10 nm to about 50 nm.

The first color changing layer 500 may include the first electrochromic material in an amount of about 70 wt% to about 98 wt% based on the total weight of the first color changing layer 500. The first color changing layer 500 may include the first electrochromic material in an amount of about 80 wt% to about 96 wt% based on the total weight of the first color changing layer 500. The first color changing layer 500 may include the first electrochromic material in an amount of about 85 wt% to about 94 wt% based on the total weight of the first color changing layer 500.

Additionally, the first discoloration layer 500 may further include a binder. The binder may be an inorganic binder. The binder may include silica gel. The binder may be formed of silica sol containing tetramethoxysilane or methyltrimethoxysilane.

The first discoloring layer 500 may include the binder in an amount of about 1 wt% to 20 wt% based on the total weight of the first discoloring layer 500. The first discoloring layer 500 may include the binder in an amount of about 2 wt% to 15 wt% based on the total weight of the first discoloring layer 500. The first discoloring layer 500 may include the binder in an amount of about 3 wt% to 10 wt% based on the total weight of the first discoloring layer 500.

The second color change layer 600 is disposed below the second transparent electrode 400. The second discoloration layer 600 may be directly disposed on the lower surface of the second transparent electrode 400. The second discoloration layer 600 may be directly electrically connected to the second transparent electrode 400.

The second color changing layer 600 is electrically connected to the second transparent electrode 400. The second color change layer 600 may be directly connected to the second transparent electrode 400. Additionally, the second discoloration layer 600 is electrically connected to the electrolyte layer 700. The second discoloration layer 600 may be electrically connected to the electrolyte layer 700.

The second color changing layer 600 may change color as it loses electrons. The second color changing layer 600 may include a second electrochromic material that is oxidized and changes color while losing electrons. The second discoloration layer 600 may include at least one from the group consisting of Prussian blue, nickel oxide, and iridium oxide.

The second color changing layer 600 may include the second electrochromic material in particle form. The Prussian blue, nickel oxide, and iridium oxide may be particles having a particle size of about 1 nm to about 200 nm. That is, the diameter of the second electrochromic particles included in the second color changing layer 600 may be from about 2 nm to about 150 nm. The diameter of the second electrochromic particle may be from about 5 nm to about 100 nm. The diameter of the two electrochromic particles may be about 10 nm to about 50 nm.

The second color changing layer 600 may include the second electrochromic material in an amount of about 70 wt% to about 98 wt% based on the total weight of the second color changing layer 600. The second color changing layer 600 may include the second electrochromic material in an amount of about 80 wt% to about 96 wt% based on the total weight of the second color changing layer 600. The second color changing layer 600 may include the second electrochromic material in an amount of about 85 wt% to about 94 wt% based on the total weight of the second color changing layer 600.

Additionally, the second discoloration layer 600 may further include the binder. The binder may be an inorganic binder. The binder may include silica gel. The binder may be formed of silica sol containing tetramethoxysilane or methyltrimethoxysilane.

The second discoloration layer 600 may include the binder in an amount of about 1 wt% to 20 wt% based on the total weight of the second discoloration layer 600. The second discoloration layer 600 may include the binder in an amount of about 2 wt% to 15 wt% based on the total weight of the second discoloration layer 600. The second discoloring layer 600 may include the binder in an amount of about 3 wt% to 10 wt% based on the total weight of the first discoloring layer 500.

The electrolyte layer 700 is disposed on the first discoloration layer 500. Additionally, the electrolyte layer 700 is disposed below the second discoloration layer 600. The electrolyte layer 700 is disposed between the first discoloring layer 500 and the second discoloring layer 600.

The electrolyte layer 700 may include positive ions involved in electrochromic reaction. The positive ion may include a metal ion. The metal ion may be selected from at least one group consisting of lithium ions (Li+), sodium ions (Na+), or potassium ions (K+). The positive ion may be a rubidium ion (Rb+) or a cesium ion (Cs+).

The electrolyte layer 700 includes a solvent. The solvent may be at least one selected from the group consisting of acetamide, adiponitrile, sulfolane, and polyethylene glycol.

The electrolyte layer 700 may include a metal salt. The metal salt is LiClO ₄ , LiBF ₄ , LiAsF ₆ , LiPF ₆ , LiCl, LiBr, LiI, LiB ₁₀ Cl ₁₀ , LiCF ₃ SO ₃ , LiCF ₃ CO ₂ , LiAsF ₆ , LiSbF ₆ , LiAlCl ₄ , CH ₃ SO ₃ At least one or more may be selected from the group consisting of Li, CF ₃ SO ₃ Li, (CF ₃ SO ₂ ) ₂ NLi, or NaClO ₄ .

Additionally, the electrolyte layer 700 may include a metal salt of a Cl or F element-containing compound. The electrolyte layer 700 is LiClO ₄ , LiBF ₄ , LiAsF ₆ , LiPF ₆ , LiCl, LiB ₁₀ Cl ₁₀ , LiCF ₃ SO ₃ , LiCF ₃ CO ₂ , LiAsF ₆ , LiSbF ₆ , LiAlCl ₄ , CF ₃ SO ₃ Li , (CF ₃ SO ₂ ) ₂ It may include one or more metal salts selected from NLi and NaClO ₄ .

The electrolyte layer 700 may include a curable resin composition that can be cured by ultraviolet ray irradiation or heat. The curable resin composition may be at least one selected from the group consisting of acrylate-based oligomers, polyethylene glycol-based oligomers, urethane-based oligomers, polyester-based oligomers, polyethylene glycol dimethyl, or polyethylene glycol diacrylate. Additionally, the electrolyte layer 700 may include a photocuring initiator and/or a thermal curing initiator.

In more detail, the electrolyte layer 700 may include a curable resin composition. The curable resin composition may have photocurability and/or heat curability.

The curable resin composition may include an acrylate copolymer.

The acrylate copolymer may be at least one selected from the group consisting of urethane acrylate and epoxy acrylate.

The molecular weight of the urethane acrylate may be about 3000 g/mol to about 50000 g/mol. The molecular weight of the urethane acrylate may be about 5000 g/mol to about 50000 g/mol.

The urethane acrylate may include ether-based urethane acrylate.

The ether-based urethane acrylate may include a first polyol, diisocyanate, and acrylate. The ether-based urethane acrylate may be formed by reacting the polyether diol, the diisocyanate, and the acrylate.

The ether-based urethane acrylate is a first polyol having a molecular weight of about 100 g/mol to about 1000 g/mol; a first diisocyanate having a molecular weight of about 100 g/mol to about 1000 g/mol; and a first acrylate having a molecular weight of about 50 g/mol to about 500 g/mol.

The first polyol may have a molecular weight of about 100 g/mol to about 1000 g/mol. The first polyol may have a molecular weight of about 200 g/mol to about 1000 g/mol. It may have a molecular weight of about 200 g/mol to about 700 g/mol.

The first polyol may include polyether diol.

The first polyol may include poly(tetramethylene ether)diol.

The ether-based urethane acrylate may include the first polyol in an amount of about 60 mole parts to about 100 mole parts based on 100 mole parts of the first diisocyanate. The ether-based urethane acrylate may include the first polyol in an amount of about 65 mole parts to about 95 mole parts based on 100 mole parts of the first diisocyanate. The ether-based urethane acrylate may include the first polyol in an amount of about 70 mole parts to about 90 mole parts based on 100 mole parts of the first diisocyanate.

The first diisocyanate may have a molecular weight of about 100 g/mol to about 1000 g/mol.

The first diisocyanate may be one or more selected from the group consisting of isoprone diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, or methylene diphenyl diisocyanate.

The first diisocyanate may be isoprone diisocyanate.

The first diisocyanate may be included in the ether-based urethane acrylate in an amount of about 30 mol% to about 70 mol% based on the total number of moles of the ether-based urethane acrylate. The diisocyanate may be included in the ether-based urethane acrylate in an amount of about 40 mol% to about 60 mol% based on the total number of moles of the ether-based urethane acrylate.

The first acrylate may have a molecular weight of about 50 g/mol to about 500 g/mol.

The first acrylate may include monoacrylate.

The first acrylate may be at least one selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and methacrylate.

The ether-based urethane acrylate may include the first acrylate in an amount of about 20 mole parts to about 40 mole parts based on 100 mole parts of the first diisocyanate. The ether-based urethane acrylate may include the first acrylate in an amount of about 23 mol parts to about 37 mol parts based on 100 mol parts of the first diisocyanate. The ether-based urethane acrylate may include the first acrylate in an amount of about 25 mole parts to about 35 mole parts based on 100 mole parts of the first diisocyanate.

The weight average molecular weight of the ether-based urethane acrylate may be about 1,000 g/mol to about 100,000 g/mol. The weight average molecular weight of the ether-based urethane acrylate may be about 2000 g/mol to about 70000 g/mol. The weight average molecular weight of the ether-based urethane acrylate may be about 5000 g/mol to about 50000 g/mol.

The ester-based urethane acrylate may include a second diisocyanate, a second polyol, and a second acrylate.

The second diisocyanate may include aliphatic diisocyanate.

The second diisocyanate is selected from the group consisting of hexamethylene diisocyanate, toluene diisocyanate, dicyclohexylmethane-4,4'-diisocyanate (H12MDI), or methylene diphenyl diisocyanate. At least one or more may be selected.

The second diisocyanate may be included in the ester-based urethane acrylate in an amount of about 20 mol% to about 60 mol% based on 100 mol% of the ester-based urethane acrylate. The second diisocyanate may be included in the ester-based urethane acrylate in an amount of about 30 mol% to about 50 mol% based on 100 mol% of the ester-based urethane acrylate.

The second polyol may include polyester diol or polycaprolactone diol.

The weight average molecular weight of the poly caprolactone diol may be about 100 g/mol to about 1000 g/mol. The weight average molecular weight of the poly caprolactone diol may be about 100 g/mol to about 800 g/mol. The weight average molecular weight of the poly caprolactone diol may be about 200 g/mol to about 800 g/mol.

The second acrylate may be at least one selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and methacrylate.

The molecular weight of the ester-based urethane acrylate may be about 3000 g/mol to about 50000 g/mol. The molecular weight of the ester-based urethane acrylate may be about 5000 g/mol to about 50000 g/mol.

The viscosity of the urethane acrylate may be about 10,000 cPs to about 100,000 cPs at a temperature of about 25°C. The viscosity of the urethane acrylate may be about 1000 cPs to about 8000 cPs at a temperature of about 60°C.

The urethane acrylate can be purchased commercially. The urethane acrylate is available from Miwonsa products, for example, Miramer PU210, Miramer PU256, Miramer PU2050, Miramer PU2100, Miramer PU2300C, Miramer PU2560, Miramer PU320, Miramer PU340, Miramer PU3000, Miramer PU3200, Miramer PU3450, Miramer PU5000, At least one may be selected from the group consisting of Miramer PU610, Miramer MU9500, Miramer MU9800, Miramer SC2154, Miramer SC2404, or Miramer SC2565.

The acrylate copolymer may include epoxy acrylate.

The epoxy acrylate can be formed by reacting an epoxy compound and an acrylate. The molar ratio of the epoxy compound and the acrylate may be about 1:1.5 to about 1:3.5.

The epoxy compound may be at least one selected from the group consisting of glycerol diglycidyl ether, bisphenol A epoxy compound, bisphenol F epoxy compound, or novolak epoxy compound.

The acrylate may be at least one selected from the group consisting of 2-carboxyethyl acrylate, 2-hydroxyethyl acrylate, or acrylic acid.

The epoxy acrylate may have a weight average molecular weight of about 200 g/mol to about 3000 g/mol. The epoxy acrylate may have a weight average molecular weight of about 500 g/mol to about 2000 g/mol. The epoxy acrylate may have a weight average molecular weight of about 500 g/mol to about 2000 g/mol.

The epoxy acrylate may have a viscosity of about 100 cPs to about 5000 cPs at a temperature of about 25°C. The epoxy acrylate may have a viscosity of about 100 cPs to about 5000 cPs at a temperature of about 25°C. The epoxy acrylate may have a viscosity of about 10,000 cPs to about 40,000 cPs at a temperature of about 25°C.

Additionally, the epoxy acrylate may have a viscosity of about 3000 cPs to about 8000 cPs at a temperature of about 40°C.

Additionally, the epoxy acrylate may have a viscosity of about 200 cPs to about 6000 cPs at a temperature of about 60°C.

The epoxy acrylate can be purchased commercially. The epoxy acrylate is a group consisting of Miramer PE210, Miramer PE250, Miramer SC6300, Miramer SC6400, Miramer PE110H, Miramer PE230, Miramer PE310, Miramer EA2235, Miramer EA2255, Miramer EA2259 or Miramer EA2280 among Miwon yarn products. At least one or more may be selected from.

The curable resin composition may further include a multifunctional acrylate monomer.

The multifunctional acrylate monomer may include bifunctional acrylate or trifunctional acrylate.

The multifunctional acrylate monomer may include two or more functional groups. The multifunctional acrylate monomer may be a monomer containing two or more acrylate functional groups. The multifunctional acrylate monomer may be an aliphatic compound containing three acrylates.

The multifunctional acrylate monomers include trimethylolpropane triacrylate, trimethylolpropane (ethylene oxide) ₃ triacrylate (trimethylolparpane (EO) ₃ triacrylate), and trimethylolpropane (ethylene oxide) ₆ triacrylate. Acrylate (trimethylolparpane (EO) ₆ triacrylate), trimethylolpropane (ethylene oxide) ₉ triacrylate (trimethylolparpane (EO) ₉ triacrylate), trimethylolpropane (ethylene oxide) ₁₅ triacrylate (trimethylolparpane (EO) ) ₁₅ triacrylate), _{glycerine (PO) 3 triacrylate} , or pentaerythritol triacrylate.

The multifunctional acrylate monomer may have a molecular weight of about 200 to about 800. The multifunctional acrylate monomer may have a molecular weight of about 200 to about 400.

The multifunctional acrylate monomer may have a viscosity of about 20 cps to about 300 cps at a temperature of about 25°C.

The multifunctional acrylate monomer may be included in the curable resin composition in an amount of about 5 wt% to about 30 wt% based on the total weight of the curable resin composition. The multifunctional acrylate monomer may be included in the curable resin composition in an amount of about 10 wt% to about 25 wt% based on the total weight of the curable resin composition. The multifunctional acrylate monomer may be included in the curable resin composition in an amount of about 13 wt% to about 23 wt% based on the total weight of the curable resin composition.

The curable resin composition may include a monofunctional acrylate monomer. The monofunctional acrylate monomer may be a monomer containing one acrylate functional group. The monofunctional acrylate monomer may be an aromatic compound containing one acrylate functional group.

The monofunctional acrylate monomers include caprolactone acrylate, cyclic trimethylolpropane formal acrylate, phenoxy benzyl acrylate, and 3,3,5-trimethylcyclo. Hexyl acrylate (3,3,5-trimethyl cyclohexyl acrylate), isobornyl acrylate, o-phenylphenol EO acrylate (o-phenylphenol EO acrylate), 4-tert-butylcyclohexyl acrylate ( 4-tert-butylcyclohexyl acrylate, benzyl acrylate, biphenylmethyl acrylate, lauryl acrylate, isodecyl acrylate, phenol (ethylene oxide) acrylate phenol (EO) _acrylate , phenol (EO) ₂ acrylate _{, phenol (EO) 4 acrylate} , or tetrahydrofurfuryl acrylate ( At least one or more may be selected from the group consisting of tetra hydrofurfuryl acrylate).

Additionally, the molecular weight of the monofunctional acrylate monomer may be about 150 to about 800. The molecular weight of the monofunctional acrylate monomer may be about 200 to about 400.

Additionally, the viscosity of the monofunctional acrylate monomer may be about 10 cps to about 60 cps at a temperature of about 25°C.

The monofunctional acrylate monomer may be included in the curable composition in an amount of about 5 wt% to about 20 wt% based on the weight of the curable composition. The monofunctional acrylate monomer may be included in the curable composition in an amount of about 5 wt% to about 10 wt% based on the weight of the curable composition. The monofunctional acrylate monomer may be included in the curable composition in an amount of about 10 wt% to about 15 wt% based on the total weight of the curable composition.

The curable composition may include an acrylate containing a thermosetting functional group. That is, the acrylate containing the thermosetting functional group may have both thermosetting and photocuring properties.

The thermosetting acrylate is composed of urethane acrylate containing a thermosetting functional group, epoxy acrylate containing a thermosetting functional group, ester acrylate containing a thermosetting functional group, and ether acrylate containing a thermosetting functional group. At least one can be selected from the group.

The thermosetting acrylate may contain a carboxyl group. The thermosetting acrylate may be selected from at least one of the compounds represented by Formulas 1 to 9 below.

[Formula 1]

[Formula 2]

[Formula 3]

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

[Formula 8]

[Formula 9]

The thermosetting acrylate may be included in the curable resin composition in an amount of about 1 wt% to about 10 wt% based on the total weight of the curable resin composition. The thermosetting acrylate may be included in the curable resin composition in an amount of about 0.5 wt% to about 5 wt% based on the total weight of the curable resin composition. The thermosetting acrylate may be included in the curable resin composition in an amount of about 2 wt% to about 8 wt% based on the total weight of the curable resin composition.

Since the curable resin composition includes the thermosetting acrylate, when an electrolyte composition containing the curable resin composition is coated, the coating layer of the electrolyte composition can be easily pre-cured or semi-cured.

Accordingly, the coating layer of the electrolyte composition can be effectively protected from external physical and chemical impacts.

The curable resin composition may further include a photocuring initiator.

The photoinitiator is benzophenone-based, thioxanthone-based, α-hydroxy ketone-based, ketone-based, phenyl glyoxylate-based and acrylic phosphatase. One or more types may be selected from the group consisting of pine oxide (acryl phosphine oxide).

The photoinitiator may be included in the curable resin composition in an amount of about 0.1 wt% to about 5 wt% based on the total weight of the curable resin composition.

The photo-curable resin composition may include a first photo initiator and a second photo initiator that act in different wavelength bands.

Specifically, the curable resin composition includes a first photoinitiator operating in a wavelength range of 208 nm to 295 nm; and a second photoinitiator operating in a wavelength range of 320 nm to 395 nm.

The operating wavelength band of the first photoinitiator may be 208 nm to 275 nm, or 208 nm to 245 nm, and the operating wavelength band of the second photoinitiator may be 330 nm to 390 nm, or 340 nm to 385 nm. there is.

As a specific example, the first photoinitiator may generate radicals by UV light in a wavelength range of 208 nm to 295 nm and in an amount of 100 mJ/cm2 to 200 mJ/cm2. Additionally, the second photoinitiator may be decomposed by UV light in a wavelength range of 320 nm to 395 nm and in an amount of 500 mJ/cm2 to 1000 mJ/cm2 to generate radicals.

The first photoinitiator may be, for example, a ketone-based photoinitiator and may have one or more aromatic groups or alicyclic groups. A specific example of the first photoinitiator may include hydroxycyclohexylphenylketone.

The second photoinitiator may be, for example, a phosphine-based photoinitiator and may have one or more aromatic groups. A specific example of the second photoinitiator may include 2,4,6-trimethylbenzoyldiphenylphosphine.

Since the curable resin composition includes the first photo initiator and the second photo initiator, when an electrolyte composition containing the curable resin composition is coated, the coating layer of the electrolyte composition can be easily pre-cured or semi-cured. . That is, ultraviolet rays of a specific wavelength range are used, and the coating layer of the electrolyte composition can be easily pre-cured or semi-cured.

Accordingly, the coating layer of the electrolyte composition can be effectively protected from external physical and chemical impacts.

The electrolyte layer 700 may further include an antioxidant.

The antioxidant may be at least one selected from the group consisting of phenol-based antioxidants, sulfur-based antioxidants, amine-based antioxidants, polyimide-based antioxidants, and phosphorus-based antioxidants.

The antioxidant may be included in the electrolyte layer 700 in an amount of 0.1 wt% to about 5 wt%, based on the total weight of the electrolyte layer 700. The antioxidant may be included in the electrolyte layer 700 in an amount of about 0.1 wt% to about 3 wt%.

Since the electrolyte layer 700 contains the antioxidant, it can be easily protected from chemical shock such as external oxygen. Accordingly, the electrolyte layer 700 can have a constant transmittance even if left for a long time.

The thickness of the electrolyte layer 700 may be about 10 ㎛ to about 200 ㎛. The thickness of the electrolyte layer 700 may be about 50 μm to about 150 μm. The thickness of the electrolyte layer 700 may be about 30 μm to about 200 μm. The thickness of the electrolyte layer 700 may be about 50 μm to about 200 μm. The thickness of the electrolyte layer 700 may be about 30 μm to about 150 μm.

When mechanical strain such as winding, bending, or twisting is applied to the electrochromic device according to the embodiment, since the electrolyte layer 700 has the above-mentioned thickness range, the electrolyte layer 700 maintains an appropriate cell gap. You can. Accordingly, the electrochromic device according to the embodiment may have uniform optical characteristics as a whole.

The electrolyte layer 700 may have a transmittance in the range of 60% to 95%. Specifically, the electrolyte layer 700 may have a transmittance of 60% to 95% for visible light in the wavelength range of 380 nm to 780 nm, more specifically, 400 nm wavelength or 550 nm wavelength. The transmittance may be total light transmittance, and may be measured using a known haze meter (HM).

The electrochromic device according to the embodiment may further include a sealing portion (not shown).

The sealing portion includes a curable resin. The sealing part may include a thermosetting resin and/or a photo-curing resin.

Examples of the thermosetting resin include epoxy resin, melamine resin, urea resin, or unsaturated polyester resin. In addition, examples of the epoxy resin include phenol novolak-type epoxy resin, cresol novolak-type epoxy resin, biphenyl novolak-type epoxy resin, trisphenol novolak-type epoxy resin, dicyclopentadiene novolak-type epoxy resin, and bisphenol A type. Epoxy resin, bisphenol F type epoxy resin, 2, 2'-diaryrbisphenol A type epoxy resin, bisphenol S type epoxy resin, hydrogenated bisphenol A type epoxy resin, propylene oxide added bisphenol A type epoxy resin, biphenyl form Examples include epoxy resins, naphthalene type epoxy resins, resorcinol type epoxy resins, and glycidyl amines.

Additionally, the sealing part may further include a heat curing agent. Hydrazide compounds such as 1, 3-bis [hydrazinocarbonoethyl 5-isopropyl hydantoin] and adipic acid dihydrazide; dicyandiamide, guanidine derivatives, 1-cyanide Noethyl-2-phenylimidazole, N-[2-(2-methyl-1-imidazolyl) ethyl]urea, 2, 4-diamino-6-[2'-methylimidazolyl (1') ]-ethyl-s-thoriazine, N, N'-bis(2-methyl-1-imidazolyl ethyl) urea, N, N'-(2-methyl-1-imidazolyl ethyl)-aziformami , 2-phenyl-4-methyl-5-hydroxymethyl imidazole, 2-imidazoline-2-thiol, 2, 2'-thiogethanethiol, addition products of various amines with epoxy resins, etc. You can.

The first sealing part may include a photo-curable resin. Examples of the photo-curable resin include acrylate-based resins such as urethane acrylate. Additionally, the sealing part may further include a photo curing initiator. The photo curing initiator may be at least one selected from the group consisting of an acetophenone-based compound, a benzophenone-based compound, a thioxanthone-based compound, a benzoin-based compound, a triazine-based compound, or an oxime-based compound.

Additionally, the sealing portion may further include a moisture absorbent such as zeolite and/or silica. Additionally, the sealing portion may further include an inorganic filler. The inorganic filler may be a material with high insulating properties, transparency, and durability. Examples of the inorganic filler include silicon, aluminum, zirconia, or mixtures thereof.

Additionally, the electrochromic device according to the embodiment may further include a first bus bar (not shown) and a second bus bar (not shown).

The first bus bar may be disposed on the first transparent electrode 300. The first bus bar may be connected to the first transparent electrode 300.

The first bus bar may be electrically connected to the first transparent electrode 300. The first bus bar may be in direct contact with the upper surface of the first transparent electrode 300. The first bus bar may be connected to the first transparent electrode 300 through solder.

The second bus bar is disposed below the second transparent electrode 400. The second bus bar is connected to the second transparent electrode 400.

The second bus bar may be electrically connected to the second transparent electrode 400. The second bus bar may be in direct contact with the lower surface of the second transparent electrode 400. The second bus bar may be connected to the second transparent electrode 400 through solder.

The first bus bar and/or the second bus bar may include metal. The first bus bar and/or the second bus bar may include a metal ribbon. The first bus bar and/or the second bus bar may include conductive paste. The first bus bar and/or the second bus bar may include a binder and a conductive filler.

The electrochromic device according to the embodiment can be manufactured by the following method. Figures 2 to 5 are cross-sectional views showing the process of manufacturing an electrochromic device according to an embodiment.

Referring to FIG. 2, a first transparent electrode 300 is formed on the first substrate 100. The first transparent electrode 300 may be formed through a vacuum deposition process. A metal oxide such as indium tin oxide may be deposited on the first substrate 100 through a sputtering process or the like to form the first transparent electrode 300.

The first transparent electrode 300 may be formed through a coating process. A nano metal wire may be coated with a binder on the first substrate 100 to form the first transparent electrode 300. A conductive polymer may be coated on the first substrate 100 to form the first transparent electrode 300.

Additionally, the first transparent electrode 300 may be formed through a patterning process. A metal layer may be formed on the first substrate 100 by a sputtering process, etc., and the metal layer may be patterned to form a first transparent electrode 300 layer including a metal mesh on the first substrate 100. there is.

Afterwards, a first discoloration layer 500 is formed on the first transparent electrode 300 layer. The first discoloration layer 500 may be formed through a sol-gel coating process. A first sol solution containing a first electrochromic material, a binder, and a solvent may be coated on the first transparent electrode 300 layer. A sol-gel reaction may occur in the coated first sol solution, and the first discoloration layer 500 may be formed.

The first sol solution may include the first discoloring material in particle form in an amount of about 5 wt% to about 30 wt%. The first sol solution may include the binder in an amount of about 5 wt% to about 30 wt%. The first sol solution may include the solvent in an amount of about 60 wt% to about 90 wt%.

The first sol solution may further include a dispersant.

The solvent may be at least one selected from the group consisting of alcohols, ethers, ketones, esters, or aromatic hydrocarbons. The solvent is ethanol, propanol, butanol, hexanol, cyclohexanol, diacetone alcohol, ethylene glycol, diethylene glycol, glycerin, diethyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol modobutyl ether. , Diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, acetone, methyl ethyl ketone, acetylacetone, methyl isobutyl ketone, cyclohexanone, acetoacetate ester, methyl acetate, ethyl acetate, At least one or more may be selected from the group consisting of n-propyl acetate and i-butyl acetate.

As described above, the binder may be an inorganic binder.

Referring to FIG. 3, a second transparent electrode 400 is formed on the second substrate 200.

The second transparent electrode 400 may be formed through a vacuum deposition process. A metal oxide such as indium tin oxide may be deposited on the second substrate 200 through a sputtering process or the like to form the second transparent electrode 400.

The second transparent electrode 400 may be formed through a coating process. A nano metal wire may be coated with a binder on the second substrate 200 to form the second transparent electrode 400. A conductive polymer may be coated on the second substrate 200 to form the second transparent electrode 400.

Additionally, the second transparent electrode 400 may be formed through a patterning process. A metal layer may be formed on the second substrate 200 by a sputtering process, etc., and the metal layer may be patterned to form a second transparent electrode layer 400 including a metal mesh on the second substrate 200. there is.

Afterwards, a second discoloration layer 600 is formed on the second transparent electrode 400 layer. The second discoloration layer 600 may be formed through a sol-gel coating process. A second sol solution containing a second electrochromic material, a binder, and a solvent may be coated on the second transparent electrode 400 layer. A sol-gel reaction may occur in the coated second sol solution, and the second discoloration layer 600 may be formed.

The second sol solution may include the second discoloring material in particle form in an amount of about 5 wt% to about 30 wt%. The second sol solution may include the binder in an amount of about 5 wt% to about 30 wt%. The second sol solution may include the solvent in an amount of about 60 wt% to about 90 wt%.

The second sol solution may further include a dispersant.

Referring to FIG. 4, an electrolyte composition for forming an electrolyte layer 700 is formed on the first discoloration layer 500.

As described above, the electrolyte composition may include the solvent, the metal salt, and the curable resin composition. Additionally, the electrolyte composition may further include additional additives such as the antioxidant.

The electrolyte composition is coated on the first discoloration layer 500. Accordingly, an electrolyte composition layer is formed on the first discoloration layer 500.

Thereafter, the electrolyte composition layer may be pre-cured or semi-cured.

The electrolyte composition layer may be pre-cured or semi-cured by heat. The electrolyte composition layer may be pre-cured or semi-cured at a temperature of about 30°C to about 60°C for about 1 minute to about 10 minutes.

The electrolyte composition layer may be pre-cured or semi-cured by light. The electrolyte composition layer may be pre-cured or semi-cured by UV light in a wavelength range of 320 nm to 395 nm and in an amount of 500 mJ/cm2 to 1000 mJ/cm2.

Referring to FIG. 5, the second substrate 200, the second transparent electrode 400, and the second discoloration layer 600 are stacked on the electrolyte composition layer. At this time, the second discoloration layer 600 is in direct contact with the electrolyte composition layer.

Thereafter, the electrolyte composition layer is cured by light, and a first laminate including the first substrate 100, the first transparent electrode 300, and the first discoloration layer 500 and the second substrate are formed. (200), a second laminate including the second transparent electrode 400 and the second color change layer 600 are laminated to each other. That is, the first laminate and the second laminate may be adhered to each other by the electrolyte layer 700.

Additionally, the electrochromic device according to the embodiment may have light transmittance. Here, the light transmittance may refer to the light transmittance based on a state in which the electrochromic device is not electrochromic. Additionally, in the description of this embodiment, light transmittance may mean total light transmittance.

The light transmittance of the electrochromic device may be about 70% to about 90%. The light transmittance of the electrochromic device may be about 75% to about 88%. The light transmittance of the electrochromic device may be about 78% to about 86%.

The electrochromic device according to the embodiment may have a haze of about 5% or less. The haze of the electrochromic device according to the embodiment may be about 0.1% to about 5%. The haze of the electrochromic device according to the embodiment may be about 0.1% to about 4%. The haze of the electrochromic device according to the embodiment may be about 0.1% to about 3%.

The light transmittance and haze may be measured by ASTM D 1003, etc.

The electrochromic device according to the embodiment may undergo a winding test.

Figures 6 and 7 are diagrams showing a process in which an electrochromic device according to an embodiment undergoes a winding test. FIG. 10 is a diagram illustrating a plane of a sample formed by cutting a portion of the transmittance deviation of an electrochromic device according to an embodiment.

Referring to FIG. 6, in order to conduct a winding test of the electrochromic device according to the embodiment, one end of the electrochromic device according to the embodiment is fixed to the outer peripheral surface of the first core 11.

The electrochromic device according to the embodiment may be processed to undergo the winding test. The electrochromic device according to the embodiment may be cut. The cut electrochromic element may have a planar shape extending long in one direction. The cut electrochromic element may have a rectangular planar shape.

The cut electrochromic element may have a rectangular shape with a length of about 5 m and a width of about 0.5 m. The cut electrochromic element may have a rectangular shape with a length of about 4 m and a width of about 0.5 m. The cut electrochromic element may have a rectangular shape with a length of about 4.5 m and a width of about 0.45 m.

The first core 11 may be a pipe-shaped paper core or a pipe-shaped plastic core. The first core 11 may have a cylindrical shape.

The diameter of the first core 11 may be about 20 cm. The diameter of the first core may be about 25 cm. The diameter of the first core 11 may be about 30 cm. The diameter of the first core 11 may be about 15 cm.

Thereafter, in a state in which a certain tension is applied to the electrochromic device according to the embodiment, the electrochromic device according to the embodiment is wound around the first core 11.

The tension when the electrochromic device according to the embodiment is wound around the first core 11 may be about 10N. The tension when the electrochromic device according to the embodiment is wound around the first core 11 may be about 15N. The tension when the electrochromic device according to the embodiment is wound around the first core 11 may be about 5N. The tension when the electrochromic device according to the embodiment is wound around the first core 11 may be about 20N.

Thereafter, the first wound electrochromic element may be left for a certain period of time. The first wound electrochromic element can be left at room temperature and relative humidity of about 50% for about 24 hours. The first wound electrochromic device can be left at room temperature and relative humidity of about 50% for about 10 days. The first wound electrochromic device can be left at room temperature and relative humidity of about 50% for about 15 days. The first wound electrochromic device can be left at room temperature and relative humidity of about 50% for about 20 days.

The primary wound electrochromic element can be left at a temperature of about 85° C., a relative humidity of about 30%, and left for about 500 hours. The first wound electrochromic element can be left at a temperature of about 85° C., a relative humidity of about 30%, and left for about 1000 hours. The primary wound electrochromic element can be left at a temperature of about 85° C., a relative humidity of about 30%, and left for about 700 hours.

Thereafter, the other end of the first wound electrochromic element is fixed to the outer peripheral surface of the second core 12.

The second core 12 may be a pipe-shaped paper core or a pipe-shaped plastic core. The second core 12 may have a cylindrical shape.

The diameter of the second core 12 may be about 20 cm. The diameter of the second core 12 may be about 25 cm. The diameter of the second core 12 may be about 30 cm. The diameter of the second core 12 may be about 15 cm.

Thereafter, in a state in which a certain tension is applied to the electrochromic element fixed to the second core 12, the electrochromic element according to the embodiment is unwound from the first core 11 and is attached to the second core 12. The second winding is carried out.

The distance between the center of the first core 11 and the center of the second core 12 may be about 1 m.

The tension when the electrochromic device according to the embodiment is wound around the second core 12 may be about 10N. The tension when the electrochromic device according to the embodiment is wound around the second core 12 may be about 15N. The tension when the electrochromic device according to the embodiment is wound around the second core 12 may be about 5N. The tension when the electrochromic device according to the embodiment is wound around the second core 12 may be about 20N.

Thereafter, the secondary wound electrochromic element may be left for a certain period of time. The secondary wound electrochromic device can be left at room temperature and relative humidity of about 50% for about 24 hours. The secondary wound electrochromic device can be left at room temperature and relative humidity of about 50% for about 10 days. The secondary wound electrochromic device can be left at room temperature and relative humidity of about 50% for about 15 days. The secondary wound electrochromic device can be left at room temperature and relative humidity of about 50% for about 20 days.

The secondary wound electrochromic element can be left at a temperature of about 85° C. and a relative humidity of about 30% for about 500 hours. The secondary wound electrochromic element can be left at a temperature of about 85° C. and a relative humidity of about 30% for about 1000 hours. The secondary wound electrochromic element can be left at a temperature of about 85° C. and a relative humidity of about 30% for about 700 hours.

As described above, the electrochromic device according to the embodiment may undergo the winding test.

More specifically, the winding test can be performed in the following method.

1) The electrochromic element is cut to a size of approximately 4 m in length and approximately 0.5 m in width.

2) One end of the electrochromic element is fixed to the first core 11 with a diameter of 15 cm.

3) The fixed electrochromic element is wound around the first core 11 at a speed of 6 revolutions per minute while maintaining a tension of 10N.

4) While wound around the first core 11, the electrochromic element is left for 24 hours at a temperature of 85° C. and a relative humidity of about 50%.

5) The other end of the left electrochromic element is fixed to the second core 12 with a diameter of 20 cm.

6) The electrochromic element wound around the first core 11 is flung while maintaining a tension of 10N, and is applied to the second core 12 at a speed of 6 rotations per minute. It is wound in the opposite direction to the direction in which it was wound.

7) In the state wound around the second core 12, the electrochromic element is left for 24 hours under conditions of a temperature of 85° C. and a relative humidity of about 50%, and the winding test is completed.

Thereafter, the electrochromic device that has undergone the winding test can be cut into multiple samples.

Next, referring to FIG. 8, in the electrochromic device that has undergone the winding test, a central region (CR) is defined, and measurement regions may be defined for each location within the central region (CR). The measurement areas may be cut to obtain a plurality of samples S.

The central region CR may have a length of about 4 m and a width of about 0.4 m in the electrochromic device according to the embodiment. The central region CR may have a length of about 3 m and a width of about 0.4 m. The central region (CR) may have a length of approximately 3 m and a width of approximately 0.35 m.

Additionally, the size of the sample (S) may be about 10 cm × 10 cm. That is, the samples S can be obtained by cutting into a square of about 10 cm x 10 cm in the central region CR.

Alternatively, the samples can be obtained by cutting the entire area into squares of approximately 10 cm x 10 cm.

Afterwards, a driving voltage is applied to the cut samples, and the samples are colored. The driving voltage may be about 1V to about 5V. Additionally, the driving voltage may be applied to the samples for about 20 seconds to about 2 minutes. A driving voltage of approximately 1.5V may be applied to the samples for approximately 1 minute. The driving voltage may be applied to the samples so that the samples can be sufficiently colored.

The driving voltage may be applied to the first transparent electrode 300 and the second transparent electrode 400 in the samples, respectively. In the samples, a portion of the first transparent electrode 300 and a portion of the second transparent electrode 400 are open and electrically connected to the first transparent electrode 300 and the second transparent electrode 400. In this state, the driving voltage may be applied to each of the samples.

The electrochromic device according to the embodiment may have a coloring transmittance deviation after the winding test.

The coloring transmittance deviation can be measured by Measurement Method 1 below.

[Measurement method 1]

After the winding test is performed, the color transmittance is measured in each of the samples. At this time, from the samples, the average colored transmittance, maximum colored transmittance, and minimum colored transmittance can be derived. Here, the coloring transmittance deviation is a value (%) obtained by dividing the difference between the maximum coloring transmittance and the minimum coloring transmittance by the average coloring transmittance.

After the winding test, the coloring transmittance deviation can be expressed by Equation 1 below.

[Formula 1]

Tinted transmittance deviation = (maximum tinted transmittance - minimum tinted transmittance)/average tinted transmittance

The coloring transmittance deviation after winding may be less than about 0.4. The coloring transmittance deviation after winding may be less than about 0.35. The coloring transmittance deviation after winding may be less than about 0.3. The coloring transmittance deviation after winding may be less than about 0.25. The coloring transmittance deviation after winding may be less than about 0.2. The coloring transmittance deviation after winding may be less than about 0.15. The coloring transmittance deviation after winding may be less than about 0.1. The coloring transmittance deviation after winding may be less than about 0.07. The coloring transmittance deviation after winding may be less than about 0.05. The minimum value of the coloring transmittance deviation after winding may be about 0.001.

The average colored transmittance may be about 5% to about 40%. The average colored transmittance may be about 10% to about 30%. The average colored transmittance may be about 10% to about 40%. The average colored transmittance may be about 10% to about 30%. The average colored transmittance may be about 10% to about 20%.

The maximum color transmittance may be about 8% to about 43%. The maximum color transmittance may be about 13% to about 33%. The maximum color transmittance may be about 13% to about 43%. The maximum color transmittance may be about 13% to about 33%. The maximum color transmittance may be about 13% to about 23%.

The minimum color transmittance may be about 3% to about 37%. The minimum color transmittance may be about 7% to about 27%. The minimum color transmittance may be about 7% to about 37%. The minimum color transmittance may be about 7% to about 27%. The minimum color transmittance may be about 7% to about 17%.

The difference between the maximum colored transmittance and the average colored transmittance may be less than about 5%. The difference between the maximum colored transmittance and the average colored transmittance may be less than about 3%. The difference between the maximum colored transmittance and the average colored transmittance may be less than about 2%.

The difference between the average colored transmittance and the minimum colored transmittance may be less than about 5%. The difference between the average colored transmittance and the minimum colored transmittance may be less than about 3%. The difference between the average colored transmittance and the minimum colored transmittance may be less than about 2%.

The electrochromic device according to the embodiment has the coloring transmittance deviation in the above range, and the maximum coloring transmittance, the minimum coloring transmittance, the average decolorizing transmittance, and the difference between them in the above range, so that it has an improved appearance. You can have it.

The electrochromic device according to the embodiment may have a discoloration transmittance deviation after the winding test.

After the winding test, the decolorization transmittance deviation can be measured by Measurement Method 2 below.

[Measurement method 2]

The colored samples are grounded or an opposite driving voltage is applied to decolorize them, and in the decolorized samples, the respective decolorizing transmittances are measured.

The opposite driving voltage may be about 1V to about 5V. Additionally, the opposite driving voltage may be applied to the samples for about 20 seconds to about 2 minutes. An opposite driving voltage of approximately 1.5V may be applied to the samples for approximately 1 minute.

After the winding test, the decolorization transmittance deviation is the difference between the maximum decolorization transmittance and the minimum decolorization transmittance among the decolorization transmittances of the samples divided by the average decolorization transmittance.

After the winding test, the decolorization transmittance deviation can be expressed by Equation 2 below.

[Formula 2]

Decolorization transmittance deviation = (maximum decolorization transmittance - minimum decolorization transmittance) / average decolorization transmittance

After the winding test, the discoloration transmittance deviation may be less than about 0.2. After the coiling, the discoloration transmittance deviation may be less than about 0.15. After the coiling, the discoloration transmittance deviation may be less than about 0.1. After the coiling, the discoloration transmittance deviation may be less than about 0.07. After the winding test, the discoloration transmittance deviation may be less than about 0.05. After the winding test, the minimum value of the decolorization transmittance deviation may be about 0.001.

The average decolorization transmittance may be about 40% to about 80%. The average decolorization transmittance may be about 45% to about 80%. The average decolorization transmittance may be about 50% to about 70%. The average decolorization transmittance may be about 50% to about 90%. The average decolorization transmittance may be about 55% to about 80%.

The maximum decolorization transmittance may be about 43% to about 83%. The maximum decolorization transmittance may be about 48% to about 83%. The maximum decolorization transmittance may be about 53% to about 73%. The maximum decolorization transmittance may be about 53% to about 93%. The maximum decolorization transmittance may be about 58% to about 83%.

The minimum decolorization transmittance may be about 37% to about 77%. The minimum decolorization transmittance may be about 42% to about 77%. The minimum decolorization transmittance may be about 47% to about 67%. The minimum decolorization transmittance may be about 47% to about 87%. The minimum decolorization transmittance may be about 52% to about 77%.

The difference between the maximum decolorization transmittance and the average decolorization transmittance may be less than about 5%. The difference between the maximum decolorization transmittance and the average decolorization transmittance may be less than about 3%. The difference between the maximum decolorization transmittance and the average decolorization transmittance may be less than about 2%.

The difference between the average decolorization transmittance and the minimum decolorization transmittance may be less than about 5%. The difference between the average decolorization transmittance and the minimum decolorization transmittance may be less than about 3%. The difference between the average decolorization transmittance and the minimum decolorization transmittance may be less than about 2%.

The electrochromic device according to the embodiment has the decolorization transmittance deviation in the above range, and the maximum decolorization transmittance, the minimum decolorization transmittance, the average decolorization transmittance, and the difference thereof in the above range, so that it has an improved appearance. You can have it.

The electrochromic device according to the embodiment may have haze deviation after the winding test.

After the winding test, the haze deviation can be measured by Measurement Method 3 below.

[Measurement method 3]

In the electrochromic device that has undergone the winding test, the haze of each of the samples is measured.

After the winding test, the haze deviation is the difference between the maximum and minimum haze among the hazes of the samples divided by the average haze.

After the winding test, the haze deviation may be less than about 0.2. After the winding test, the haze deviation can be less than about 0.15. After the winding test, the haze deviation may be less than about 0.1. After the winding test, the haze deviation may be less than about 0.07. After the winding test, the haze deviation can be less than about 0.05. After the winding test, the minimum value of the haze deviation may be about 0.001.

After the winding test, the maximum haze may be less than about 5%. After the winding test, the maximum haze may be less than about 4%. After the winding test, the maximum haze may be less than about 3%.

After the winding test, the minimum haze may be less than about 4.5%. After the winding test, the minimum haze may be less than about 3.5%. After the winding test, the minimum haze may be less than about 2.5%.

After the winding test, the average haze may be less than about 5%. After the winding test, the average haze may be less than about 4%. After the winding test, the average haze may be less than about 3%.

After the winding test, the difference between the maximum haze and the average haze may be less than 1%. After the winding test, the difference between the maximum haze and the average haze may be less than 0.5%.

After the winding test, the difference between the average haze and the minimum haze may be less than 1%. After the winding test, the difference between the average haze and the minimum haze may be less than 0.5%.

Since the electrochromic device according to the embodiment has the haze deviation in the above range, and has the average haze, the maximum haze, the minimum haze, and their differences in the above range, the electrochromic device according to the embodiment The device may have an improved appearance.

The electrochromic device according to the embodiment may have a movable range and a deviation in the movable range.

The movable range and the movable range deviation can be measured by Measurement Method 4 below.

[Measurement method 4]

In the electrochromic device that has undergone the winding test, the operating range in the samples is the difference between the decolorization transmittance and the coloring transmittance in the samples, and the operating range deviation is the maximum operating range and minimum operating range in the samples. It is the difference in range divided by the average range of motion.

In an electrochromic device according to an embodiment, after the winding test, the operating range deviation may be less than about 0.2. After the winding test, the range of motion deviation may be less than about 0.15. After the winding test, the range of motion deviation may be less than about 0.1. After the winding test, the range of motion deviation may be less than about 0.07. After the winding test, the range of motion deviation may be less than about 0.05. After the winding test, the minimum value of the operating range deviation may be about 0.001.

The range of motion can be derived by Equation 3 below.

[Formula 3]

Operation range = discoloration transmittance - coloring transmittance

The movable range deviation can be derived by Equation 4 below.

[Formula 4]

Range of motion deviation = (maximum range of motion - minimum range of motion)/average range of motion

The average range of motion may be about 30% to about 70%. The average range of motion may be about 40% to about 60%. The average range of motion may be about 42% to about 58%.

The maximum range of motion may be about 35% to about 75%. The maximum range of motion may be about 45% to about 65%. The maximum range of motion may be about 45% to about 61%.

The minimum range of motion may be about 25% to about 65%. The minimum range of motion may be about 35% to about 55%. The minimum range of motion may be about 39% to about 55%.

Since the electrochromic element according to the embodiment has the above-described ranges, the movable range deviation, the average movable range, the maximum movable range, and the above-mentioned minimum movable range, the light incident inside is appropriately adjusted according to the external environment. It can be adjusted properly.

After the winding test, the electrochromic device according to the embodiment has an appropriate coloring transmittance deviation, an appropriate decolorization transmittance deviation, an appropriate haze deviation, an appropriate operating range deviation, an appropriate maximum coloring transmittance, an appropriate minimum coloring transmittance, and an appropriate average range as described above. It has a coloring transmittance, an appropriate maximum decolorizing transmittance, an appropriate minimum decolorizing transmittance, and an appropriate average decolorizing transmittance. In other words, the electrochromic device according to the embodiment is flexible and can prevent performance degradation against a certain degree of mechanical deformation such as winding.

Since the first substrate 100 and the second substrate 200 have appropriate mechanical properties, they can be appropriately bent by external force. Additionally, because the electrolyte layer 700 has appropriate mechanical properties, it can be easily bent by external force and at the same time efficiently maintain the cell gap.

Accordingly, even if mechanical deformation, such as winding, is applied to the electrochromic device according to the embodiment by an external force, the electrochromic device according to the embodiment may have uniform optical characteristics as a whole.

Accordingly, after an external mechanical strain is applied to the electrochromic device according to the embodiment, when it is restored, it may have uniform coloring transmittance, decolorizing transmittance, and haze as a whole.

In particular, in the electrochromic device according to the embodiment, the electrolyte layer 700 may have a thickness of about 30 μm or more. Accordingly, the electrochromic device according to the embodiment can have a buffering function of the electrolyte layer 700 even against external mechanical shock. At the same time, the electrochromic device according to the embodiment can simultaneously have appropriate flexibility.

Accordingly, the electrochromic device according to the embodiment can minimize changes in appearance due to pressing and/or bending, and maintain color changing performance. Additionally, since the electrochromic device according to the embodiment has fast restoration performance, it may have an improved appearance.

Additionally, since the electrochromic device according to the embodiment is resistant to mechanical deformation such as winding, it can be easily manufactured through a production process including a winding process such as a roll-to-roll process.

Additionally, the electrolyte layer 700 may be formed by a thermal crosslinking process and a photocuring process of the curable resin. Accordingly, the electrolyte layer 700 may have a high crosslinking density.

Accordingly, the electrolyte layer 700 can be strongly bonded to the first discoloration layer 500 and the second discoloration layer 600. Accordingly, the electrochromic device according to the embodiment may have improved peel strength.

Additionally, because the electrolyte layer 700 has an improved crosslinking density, the electrochromic device according to the embodiment can prevent leakage of the electrolyte contained in the electrolyte layer 700. In addition, even if the electrochromic device according to the embodiment is wound or twisted, the electrolyte layer 700 has appropriate bonding strength and elasticity, so coloring transmittance deviation that may occur due to peeling, etc. can be reduced.

FIG. 9 is a diagram illustrating a window device 1 according to an embodiment.

Referring to FIG. 9, the window device 1 according to the embodiment includes the electrochromic element 10, a frame 20, windows 31, 32, and 33, a plug-in component 40, and a power source 50. Includes.

The frame 20 may be composed of one or more pieces. For example, the frame 20 may be composed of one or more materials such as vinyl, PVC, aluminum (Al), steel, or fiberglass. The frame 20 fixes the windows 31, 32, and 33 and seals the space between the windows 31, 32, and 33. also,

The frame 20 may hold or include pieces of foam or other material. The frame 20 includes a spacer, and the spacer can be placed between adjacent windows 31, 32, and 33. Additionally, the spacer, together with the adhesive sealant, can airtightly seal the space between the windows 31, 32, and 33.

The windows 31, 32, 33 are fixed to the frame 20. The windows 31, 32, and 33 may be glass panes. The windows 31, 32, 33 are made of conventional silicon oxide (SOx) glass, such as soda lime glass or float glass, consisting of approximately 75% silica (SiO2) plus Na2O, CaO, and some minor additives. It may be a glass substrate of the system. However, any material with suitable optical, electrical, thermal, and mechanical properties may be used. The windows 31, 32, 33 can also be made of, for example, other glass materials, plastics and thermoplastics (e.g. poly(methyl methacrylate), polystyrene, polycarbonate, allyl diglycol carbonate, SAN (styrene acrylonitrile copolymer), poly(4-methyl-1-pentene), polyester, polyamide), or mirror materials. The windows 31, 32, and 33 may include tempered glass.

The windows 31, 32, and 33 may include a first window 31, a second window 32, and a third window 33. The first window 31 and the third window 33 may be disposed on the outermost side, and the second window 32 may be disposed between the first window 31 and the third window 33. there is.

The electrochromic element 10 is disposed between the first window 31 and the second window 32. The electrochromic element 10 may be laminated to the first window 31 and the second window 32.

The electrochromic element 10 may be laminated to the first window 31 using a first polyvinyl butyral sheet. That is, the first polyvinyl butyral sheet may be disposed on the first window 31 and the electrochromic element 10 and laminated on the first window 31 and the electrochromic element 10. .

The electrochromic element 10 may be laminated to the second window 32 by a second polyvinyl butyral sheet. That is, the second polyvinyl butyral sheet may be disposed on the second window 32 and the electrochromic element 10 and laminated on the second window 32 and the electrochromic element 10. .

A space 60 may be formed between the second window 32 and the third window 33. The space may be filled with one or more gases such as argon (Ar), krypton (Kr), or xenon (Xn).

The windows 31, 32, 33 may be any glass pane size for residential or commercial window applications. The size of glass panes can vary widely depending on the specific needs of a home or commercial business. In some embodiments, the windows 31, 32, and 33 may be formed of architectural glass. Architectural glass is commonly used in commercial buildings, but may also be used in residential buildings and typically, although not necessarily, separates the indoor environment from the outdoor environment. In some embodiments, a suitable architectural glass substrate may be at least approximately 20 inches by approximately 20 inches, and may be much larger, for example, approximately 80 inches by approximately 120 inches, or larger. Architectural glass is typically at least about 2 millimeters (mm) thick and can be as thick as 6 mm or more.

In one embodiment, the windows 31, 32, and 33 may have a thickness ranging from approximately 1 mm to approximately 10 mm.

In one embodiment, the windows 31, 32, 33 may be very thin and flexible, such as Gorilla Glass® or WillowTM Glass, each of which is commercially available from Corning, Inc. of Corning, New York. These glasses may be less than 0.3 mm thick or less than about 1 mm thick.

The plug-in component (40) may include a first electrical input (41), a second electrical input (42), a third electrical input (43), a fourth electrical input (44) and a fifth electrical input (45). You can.

Additionally, the power supply unit 50 includes a first power terminal 51 and a second power terminal 52.

The first electrical input 41 is electrically coupled to the first power terminal 51 through one or more wires or other electrical connections, components, or devices.

The first electrical input 41 may include a pin, socket, or other electrical connector or conductor. Additionally, the first electrical input 41 may be electrically connected to the electrochromic element 10 through a first bus bar (not shown). The first bus bar may be electrically connected to the second transparent electrode 400.

The second electrical input 42 is electrically coupled to the second power terminal 52 through one or more wires or other electrical connections, components, or devices.

The second electrical input 42 may include a pin, socket, or other electrical connector or conductor. Additionally, the second electrical input 42 may be electrically connected to the electrochromic element 10 through a second bus bar (not shown). The second bus bar may be electrically connected to the first transparent electrode 300.

The third electrical input 43 may be coupled to device, system, or building ground.

The fourth electrical input 44 and the fifth electrical input 45 can be used individually, for example, for communication between a controller or microcontroller controlling the window device 1 and a network controller.

The power supply unit 50 supplies power to the electrochromic element 10 through the plug-in component 40. In addition, the power supply unit 50 can be controlled by the external controller to supply power of a certain waveform to the electrochromic element 10.

Additionally, the features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

Although the above description focuses on the examples, this is only an example and does not limit the present invention, and those skilled in the art will be able to You will see that various variations and applications are possible. For example, each component specifically shown in the examples can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

Manufacturing example

ITO film: Hansung Industrial Co., Ltd., HI150-ABE-125A-AB

Tungsten oxide powder: Adcro Co., Ltd., ELACO-W

Nickel oxide powder: Adcro Co., Ltd., ELACO-P

Solvent: acetamide (AA), adiponitrile (AN), sulfolane (SF)

Lithium salt: LiClO ₄

Urethane acrylate

About 4 mole parts of toluene diisocyanate and about 6 mole parts of polyester polyol (Union Hwaseong Co., Ltd., U-1220) with a weight average molecular weight of about 2000 mol/g were introduced into the reactor, and a tin-based catalyst was added at about 500 ppm, adding about 500 ppm of a tin-based catalyst. After stirring at 85°C for about 1 hour, 2 molar parts of (meth)acrylate having a hydroxyl group was added, and the mixture was stirred at about 85°C for about 1 hour to prepare ester-based urethane acrylate. The weight average molecular weight of the ester-based urethane acrylate was about 12000 g/mol.

Epoxy Acrylate

4 molar parts of glycerol diglycidyl ether (GDE) and 8 molar parts of 2-carboxyethyl acrylate (2-HEA) were added to the reactor, and about 500 ppm of an amine-based catalyst was added, Glycerol epoxy acrylate was prepared by stirring at about 100°C for about 1 hour.

Multifunctional acrylate: Miwonsa, Miramer M500

Monofunctional acrylate: Miwonsa, Miramer M150

Photoinitiator: Ethyl(2,4,6-trimethyl benzoyl)phenyl phosphinate

Antioxidant: Shinseung Hichem, Antioxidant-MD1024

Manufacturing Example 1

About 15 parts by weight of urethane acrylate, about 10 parts by weight of epoxy acrylate, about 5 parts by weight of multifunctional acrylate, about 5 parts by weight of monofunctional acrylate, about 1 part by weight of photoinitiator, about 15 parts by weight of lithium salt, about 50 parts by weight. An electrolyte composition was prepared by adding 1 part acetamide and about 1 part by weight antioxidant.

Preparation Examples 2 to 4

As shown in Table 1 below, the composition of the electrolyte composition was changed.

division Urethane acrylate
(part by weight) Monofunctional acrylate
(part by weight) Multifunctional acrylates
(part by weight) Epoxy acrylate
(part by weight) menstruum
(part by weight) lithium salt
(part by weight) Manufacturing Example 1 15 5 5 10 AA, 50 15 Manufacturing example 2 10 5 5 15 AN, 50 15 Manufacturing Example 3 15 10 5 5 SF, 50 15 Manufacturing example 4 13 5 7 10 AA, 50 15

Example 1

About 10 parts by weight of tungsten oxide powder, about 1 part by weight of TEOS, and about 90 parts by weight of ethanol were uniformly mixed to prepare a first color changing material composition. The first color-changing material composition was coated on the first ITO film to a thickness of about 40㎛, and a first color-changing layer was prepared through a sol-gel reaction at a temperature of about 110°C for about 5 minutes. About 11 parts by weight of nickel oxide powder, about 1 part by weight of TEOS, and about 89 parts by weight of ethanol were uniformly mixed to prepare a second color change material composition. The second color-changing material composition is coated on a second ITO film to a thickness of about 50㎛, and a second color-changing layer including a second color-changing layer is formed by a sol-gel reaction at a temperature of about 120° C. for about 5 minutes. manufactured. The electrolyte composition was coated on the first discoloration layer to a thickness of about 100 μm. The coated electrolyte composition was dried at a temperature of about 120° C. for about 10 minutes to prepare a first laminate. Thereafter, the first laminate and the second laminate were laminated, and the electrolyte composition was cured by UV light. Thereafter, the laminate was left at room temperature for about 14 hours to age. Accordingly, the electrochromic device according to the example was manufactured.

Examples 2 to 4

As shown in Table 2 below, the electrolyte composition was used to form the electrolyte layer. For the remaining processes, Example 1 was referred to.

division electrolyte composition Example 1 Manufacturing example 1 Example 2 Production example 2 Example 3 Production example 3 Example 4 Production example 4

Evaluation example

1. Winding test

1) The electrochromic element is cut to a size of 4 m in length and 0.5 m in width.

2) One end of the electrochromic element is fixed to a first core with a diameter of 15 cm.

3) The fixed electrochromic element is wound around the first core at a speed of 6 revolutions per minute while maintaining a tension of 10N.

4) While wound around the first core, the electrochromic element is left for 24 hours at a temperature of 85° C. and a relative humidity of about 50%.

5) The other end of the left electrochromic element is fixed to a second core with a diameter of 15 cm.

6) The electrochromic element wound around the first core is wound around the second core at a speed of 6 revolutions per minute while maintaining a tension of 10N, in a direction opposite to the direction in which it is wound around the first core. all.

7) In the state wound around the second core, the electrochromic element is left at a temperature of 85° C. and a relative humidity of about 50% for 24 hours, and the winding test is completed.

8) In the electrochromic device that has undergone the above winding test, a central region of 3 m in length and 0.4 m in width is defined.

9) The central area is cut into measurement areas of 10 cm x 10 cm, and multiple samples are obtained.

2. Transmittance and Haze

The transmittance of the sample is measured as total light transmittance by a solar spectrum meter (EDTM company, SS2450).

The haze of the sample was measured by a solar spectrum meter (EDTM, SS2450).

3. Colored transmittance deviation

In the samples that underwent the winding test, a first bus bar and a second bus bar are mounted on the first transparent electrode and the second transparent electrode, respectively. Then, a driving voltage of about 1.5V is applied to the first bus bar and the second bus bar for about 1 minute, and the samples are colored.

The transmittance of the colored samples is measured, and for each sample, the maximum colored transmittance, minimum colored transmittance and average colored transmittance are derived, and the colored transmittance deviation is obtained.

4. Discoloration transmittance deviation

An opposite driving voltage of about 1.5V is applied to the colored samples for about 1 minute, and the samples are decolorized. The transmittance of the decolorized sample is measured, and for each sample, the maximum decolorized transmittance, the minimum decolorized transmittance and the average decolorized transmittance are derived, and the decolorized transmittance deviation is obtained.

5. Haze deviation

The haze of the samples that underwent the winding test was measured. For each sample, the maximum haze, minimum haze and average haze are derived and the haze deviation is obtained.

5. Range of motion deviation

For each sample, the operating range was derived from the coloring transmittance and decolorizing transmittance, and the operating range deviation was calculated.

As shown in Table 3 below, in the electrochromic devices according to the examples, coloring transmittance deviation, decolorizing transmittance deviation, haze deviation, and operating range deviation were derived.

division Tinted transmittance deviation Discoloration transmittance deviation Haze deviation range of motion deviation Example 1 0.133 0.083 0.05 0.11 Example 2 0.193 0.067 0.063 0.13 Example 3 0.166 0.05 0.12 0.07 Example 4 0.12 0.053 0.11 0.09

As shown in Table 3, it was found that the electrochromic devices according to the examples had low haze deviation, low coloring transmittance deviation, low discoloration transmittance deviation, and low operating range deviation.

First substrate (100)
Second substrate (200)
First transparent electrode (300)
Second transparent electrode (400)
First discoloration layer (500)
Second color change layer (600)
Electrolyte layer (700)

Claims (11)

first substrate;
a first transparent electrode disposed on the first substrate;
a first discoloring layer disposed on the first transparent electrode;
An electrolyte layer disposed on the first discoloration layer;
a second discoloration layer disposed on the electrolyte layer;
a second transparent electrode disposed on the second discoloration layer; and
It includes a second substrate disposed on the second transparent electrode,
An electrochromic element having a coloring transmittance deviation of less than 0.4 after a winding test measured by the following measurement method.
[measurement method]
1) The electrochromic element is cut to a size of 4 m in length and 0.5 m in width.
2) One end of the electrochromic element is fixed to a first core with a diameter of 20 cm.
3) The fixed electrochromic element is wound around the first core at a speed of 6 revolutions per minute while maintaining a tension of 10N.
4) While wound around the first core, the electrochromic element is left for 24 hours at a temperature of 85° C. and a relative humidity of about 50%.
5) The other end of the left electrochromic element is fixed to a second core with a diameter of 15 cm.
6) The electrochromic element wound around the first core is wound around the second core at a speed of 6 revolutions per minute while maintaining a tension of 10N, in a direction opposite to the direction in which it is wound around the first core. all.
7) In the state wound around the second core, the electrochromic element is left at a temperature of 85° C. and relative humidity of about 50% for 24 hours, and the winding test is completed.
8) In the electrochromic device that has undergone the above winding test, a central region of 3 m in length and 0.4 m in width is defined.
9) The central area is cut into measurement areas of 10 cm x 10 cm, and multiple samples are obtained.
10) A driving voltage is applied to the first transparent electrode and the second transparent electrode included in the samples, and the samples are colored.
11) The first transmittance of the colored samples is measured.
12) The coloring transmittance deviation is the difference between the maximum first transmittance and the minimum first transmittance among the first transmittances of the samples divided by the average first transmittance of the samples. The electrochromic device according to claim 1, wherein the decolorization transmittance deviation after the winding test measured by the following measurement method is less than 0.2.
[measurement method]
A driving voltage is applied to the colored samples in the reverse direction to decolorize the colored samples. In each of the decolorized samples, a second transmittance is measured, and the decolorizing transmittance deviation is the maximum of the second transmittances of the samples. It is the difference between the second transmittance and the minimum second transmittance divided by the average second transmittance of the samples. The electrochromic device according to claim 1, wherein the haze deviation after the winding test is less than 0.2, as measured by the following measurement method.
[measurement method]
In the electrochromic device that has undergone the winding test, the haze is measured in each of the samples, and the haze deviation is the difference between the maximum haze and the minimum haze among the hazes of the samples divided by the average haze of the samples. The method of claim 1, wherein the electrolyte layer includes a curable resin composition, a solvent, and a metal salt,
An electrochromic device wherein the electrolyte layer has a thickness of 30㎛ to 200㎛. The electrochromic device according to claim 1, wherein the operating range deviation after the winding test is less than 0.2, as measured by the following measurement method.
[measurement method]
In the electrochromic device that has undergone the winding test, the operating range in the samples is the difference between the first transmittance and the second transmittance in the samples, and the operating range deviation is the maximum operating range and minimum operating range in the samples. It is the difference in range of motion divided by the average range of motion. The electrochromic device of claim 4, wherein the curable resin composition includes a photocurable polymer having a thermosetting functional group. The method of claim 1, wherein the first substrate has a modulus of 200 kgf/mm2 to 400 kgf/mm2 in the first direction,
The second substrate is an electrochromic device having a modulus of 200 kgf/mm2 to 400 kgf/mm2 in the first direction. The method of claim 7, wherein the first substrate has an elongation at break of 30% to 150% in the first direction,
The second substrate is an electrochromic device having a fracture elongation of 30% to 150% in the first direction. The electrochromic device of claim 2, wherein the average first transmittance is 5% to 40%. The electrochromic device of claim 9, wherein the average second transmittance is 40% to 80%. frame;
a window mounted on the frame; and
Comprising an electrochromic element disposed in the window,
The electrochromic element is
first substrate;
a first transparent electrode disposed on the first substrate;
a first discoloring layer disposed on the first transparent electrode;
An electrolyte layer disposed on the first discoloration layer;
a second discoloration layer disposed on the electrolyte layer;
a second transparent electrode disposed on the second discoloration layer; and
It includes a second substrate disposed on the second transparent electrode,
A window device having a tinted transmittance deviation of less than 0.4 after the winding test measured by the measurement method below.
[measurement method]
1) The electrochromic element is cut to a size of 4 m in length and 0.5 m in width.
2) One end of the electrochromic element is fixed to a first core with a diameter of 15 cm.
3) The fixed electrochromic element is wound around the first core at a speed of 6 revolutions per minute while maintaining a tension of 10N.
4) While wound around the first core, the electrochromic element is left for 24 hours at a temperature of 85° C. and a relative humidity of about 50%.
5) The other end of the left electrochromic element is fixed to a second core with a diameter of 15 cm.
6) The electrochromic element wound around the first core is wound around the second core at a speed of 6 revolutions per minute while maintaining a tension of 10N, in a direction opposite to the direction in which it is wound around the first core. all.
7) In the state wound around the second core, the electrochromic element is left at a temperature of 85° C. and a relative humidity of about 50% for 24 hours, and the winding test is completed.
8) In the electrochromic device that has undergone the above winding test, a central region of 3 m in length and 0.4 m in width is defined.
9) The central area is cut into measurement areas of 10 cm x 10 cm, and multiple samples are obtained.
10) A driving voltage is applied to the first transparent electrode and the second transparent electrode included in the samples, and the samples are colored.
11) The first transmittance of the colored samples is measured.
12) The coloring transmittance deviation is the difference between the maximum first transmittance and the minimum first transmittance among the first transmittances of the samples divided by the average first transmittance of the samples.