Laminates and functional films containing them

Abstract

The present invention relates to a laminate and a functional film containing the same, comprising a metal vapor deposition layer formed on the outer surface facing a light source, and a polymer coating layer formed on the lower surface of the metal vapor deposition layer, wherein the thickness of the polymer coating layer is greater than 0.3 μm and less than 3.0 μm.

Description

Technical Field

[0001] The present invention relates to a laminate including a heat insulation function and low reflection characteristics, and a functional film including the laminate.

Background Art

[0002] In many cases, an external light blocking coating is applied to moving means such as vehicles and / or glass windows of buildings. In particular, in some countries such as South Korea, projects to promote the improvement of the energy performance of private buildings are supported through laws such as the <Green Building Construction Support Act>. In addition, among these, the energy consumption efficiency grade of building fixtures through the installation of high-performance windows and doors is required as essential. Therefore, it can be expected that the demand for heat energy shielding films for ensuring air conditioning energy efficiency will further expand.

[0003] For the functional layer for applying an external light blocking coating film to a window, it is common to apply a metal or a metal alloy. In this case, however, a reflection phenomenon may occur.

[0004] For example, in Korean Registered Patent Publication No. 10-1470901, a base material mainly made of PET or PC; a coating layer on which a coating agent that reflects infrared rays and absorbs heat is deposited on the upper part of the base material; an adhesive layer on which an adhesive that selectively shields ultraviolet rays and infrared rays is adhered to the lower part of the base material; and a thin film layer on which a thin film having visibility and shielding properties is selectively further deposited between the base material and the coating layer or between the base material and the adhesive layer; a heat reflective film is provided. However, the visible light transmittance and / or absorbance may be excessively low, and the total solar energy transmittance may be excessively low, making it difficult to secure a field of view.

[0005] Therefore, there is a need to develop a functional film that can ensure internal energy efficiency and secure a field of view by appropriately reducing the transmittance.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Korean Registered Patent Publication No. 10-1470901 [Overview of the project] [Problems that the invention aims to solve]

[0007] In order to solve the aforementioned problems, the present invention aims to provide a laminate with reduced total solar energy transmittance and a functional film containing the same.

[0008] Furthermore, the present invention aims to provide a laminate and a functional film containing the same, which improve the reflection problem that can occur in existing metal vapor-deposited films by having a low reflectivity function for visible light.

[0009] However, the problems that this invention aims to solve are not limited to those mentioned above, and other problems not mentioned should be clearly understood by an ordinary person from the description below. [Means for solving the problem]

[0010] The present invention relates to a laminate comprising a metal vapor deposition layer formed on the outer surface facing a light source, and a polymer coating layer formed on the lower surface of the metal vapor deposition layer, wherein the thickness of the polymer coating layer is greater than 0.3 μm and less than 3.0 μm.

[0011] The present invention relates to polymer coating layers made of polyaniline, polythiophene, polyethylenedioxythiophene (PEDOT), polyimide, polystyrenesulfonate (PSS), polypyrrole, polyacetylene, poly(p-phenylene), poly(p-phenylene sulfide), poly(p-phenylenevinylene), and polythiophene poly(p-phenylenevinylene). It may also contain one or more selected from Poly(thienylenevinylene)), poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate, (PEDOT:PSS)), and combinations thereof.

[0012] The present invention further comprises a substrate in the laminate, and the polymer coating layer may be included on one or both sides of the substrate.

[0013] The present invention may also include one or more metals selected from Ag, Cu, Au, Al, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Cd, In, Sn, Hf, Ta, W, Re, Os, Ir, Pt, Tl, Pb, Bi, Ga, Ge, Sb, Ac, Th, and alloys thereof in which the metal of the metal layer is selected.

[0014] The present invention may further include one or more of the laminate selected from protective films and adhesive films.

[0015] Further, the present invention may relate to a functional film including the laminate.

[0016] Further, the total solar energy transmittance (TTS) of the functional film of the present invention may be 20% or less.

[0017] Further, the total solar energy transmittance (Total solar Energy transmittance, T , , [Figure 1] ) of the present invention may be 15 to 20%.

[0018] Further, the visible light transmittance of the functional film of the present invention may be 25 to 30%.

[0019] Further, the present invention may be characterized in that the visible light reflectance measured inside the functional film is 25% or less.

[0020] Further, the present invention may be characterized in that the visible light reflectance measured inside the functional film is 15 to 25%.

Advantages of the Invention

[0021] According to the laminate and the functional film including the same according to the present invention, the energy economy may be improved by effectively shielding the total solar energy.

[0022] Further, according to the laminate and the functional film including the same according to the present invention, since the visible light transmittance is appropriately high and the inner visible light reflectance is low, the problem of visual obstruction due to the reflection phenomenon between indoor and outdoor can be improved.

Brief Description of the Drawings

[0024] In Figures 1 and 2 above, the arrows represent light sources.

[0025] This invention relates to a laminate and a functional film containing the same, which improve energy efficiency and alleviate the problem of obstructed view by reducing the transmittance of total solar energy and having a low-reflection function.

[0026] More specifically, the laminate includes a metal vapor-deposited layer formed on the outer surface facing the light source, and a polymer coating layer formed on the lower surface of the metal vapor-deposited layer, wherein the thickness of the polymer coating layer is greater than 0.3 μm and less than 3.0 μm. The total solar energy transmittance (T) of the functional film including the laminate is... TS The visible light transmittance is 25 to 30%, and the visible light reflectance measured on the inside is 25% or less, preferably 15 to 25%.

[0027] The embodiments of the present invention will be described in more detail below with reference to the drawings. However, the following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further illustrate the technical concept of the present invention together with the content of the invention described above. Therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0028] The terms used herein are for illustrative purposes only and are not intended to limit the invention. In this specification, the singular form includes the plural form unless otherwise specified.

[0029] As used herein, “comprises” and / or “comprising” are used in a manner that does not exclude the presence or addition of one or more other components, steps, operations, and / or elements other than those mentioned. Reference numerals identical throughout the specification refer to the same component.

[0030] Spatially relative terms such as "down," "bottom," "lower part," "up," "top," and "upper part" can be used to easily describe the correlation between one element or component and another, as shown in the drawing. Spatially relative terms should be understood as including the different orientations of elements in use or operation, in addition to the directions shown in the drawing. For example, when overturning an element shown in the drawing, an element described as "down" or "lower part" of another element may also be placed "up" of the other element. Therefore, the exemplary term "down" can include both the down and up directions. Elements can also be oriented in other directions, and thus spatially relative terms can be interpreted by orientation.

[0031] <Laminate> Figure 1 shows the laminated structure of a laminate according to one embodiment of the present invention. Referring to Figure 1, the laminate according to one embodiment of the present invention includes a metal vapor deposition layer 110 formed on the outer surface facing the light source, and a polymer coating layer 120 formed on the lower surface of the metal vapor deposition layer, wherein the thickness of the polymer coating layer 120 is greater than 0.3 μm and less than 3.0 μm.

[0032] A laminate according to one embodiment of the present invention may further include a substrate, and by including a polymer coating layer on the lower surface of the metal vapor deposition layer, which is present on one or both surfaces of the substrate, the transmittance of solar energy is reduced and the heat insulation rate is excellent. When a functional film including the laminate of the present invention is vapor-deposited, the energy efficiency of heating and cooling can be improved, and the effect of improving visibility obstruction caused by reflections occurring indoors and outdoors can be provided.

[0033] More specifically, in the laminate of the present invention, the surface facing the light source and the surface not facing the light source are distinguished, with the surface facing the light source defined as the outer surface and the surface not facing the light source defined as the inner surface. For example, in Figure 1, the arrow represents the light source, and in Figure 1, the metal vapor deposition layer 110 is the surface of the laminate of the present invention that faces the light source. One feature of the laminate of the present invention is that the metal vapor deposition layer 110 and the polymer coating layer 120 are laminated in that order from the outer surface. This lamination order has advantages in that it can effectively control the total solar energy transmittance, which determines the heat shielding function from external solar energy.

[0034] Metal vapor deposition layer 110 The metal vapor deposition layer 110 is provided to reflect solar energy, and is preferably formed on the outer surface facing the light source in terms of effectively reflecting and / or blocking thermal energy from solar energy. The metal vapor deposition layer may contain one or more selected from Ag, Cu, Au, Al, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Cd, In, Sn, Hf, Ta, W, Re, Os, Ir, Pt, Tl, Pb, Bi, Ga, Ge, Sb, Ac, Th, and alloys thereof, but materials included in the metal vapor deposition layer of functional films commonly used in the art can be used without special limitations.

[0035] The method for manufacturing the metal vapor-deposited layer is not particularly limited, and it is common to use coating methods such as sputter deposition, electron beam deposition, thermal deposition, chemical vapor deposition, or solution-based processes, which are commonly used in this field.

[0036] The metal vapor deposition layer 110 is generally 3 to 150 nm in thickness, preferably 30 to 100 nm, and more preferably 80 to 100 nm. If the thickness is less than the above range, the uniformity of the metal vapor deposition layer may be poor during formation, or the ability to reflect external solar energy may decrease, resulting in the disadvantage of not being able to achieve the desired solar energy transmittance. If the thickness exceeds the above range, there is a possibility that the desired thermal barrier characteristic value may not be met.

[0037] Polymer coating layer 120 The polymer coating layer 120 may be used for solar energy absorption and other applications by reducing the reflectance of incident light and adjusting the transmittance, but is not limited to this, and may be provided according to various needs. According to the present invention, the polymer coating layer 120 may be formed in direct contact with the lower surface of the metal vapor deposition layer 110, or may be included on one or both sides of the substrate. Furthermore, when included as multiple layers on both sides of the substrate, even better total solar energy transmittance, visible light transmittance and / or inner visible light reflectance can be achieved.

[0038] The polymer coating layer 120 can be any polymer resin known in the art without limitation, such as epoxy, cellulose, acrylic, vinyl chloride, vinyl acetate, polyvinyl alcohol, polyurethane, polyester, or polyethylene polymer resins. These can be used individually or in combination of two or more. In particular, the present invention allows the polymer coating layer to include a dielectric polymer, for example, polyaniline, polythiophene, polyethylenedioxythiophene (PEDOT), polyimide, polystyrenesulfonate (PSS), polypyrrole, polyacetylene, poly(p-phenylene), poly(p-phenylene sulfide), poly(p-phenylenevinylene), and polythiophene(p-phenylenevinylene) The material may be selected from Poly(thienylenevinylene)), Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), (PEDOT:PSS), and combinations thereof, of which (Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)) (PEDOT:PSS) is preferred because it has high electrical dielectric properties, excellent safety and processability, and excellent coating properties and crack resistance, which are important factors when forming films.

[0039] The polymer coating layer 120 is formed from a polymer coating layer forming composition containing the polymer, and may further contain a solvent. The solvent may include ordinary solvents used in the composition field, such as deionized water; alcohol compounds such as methanol, ethanol, isopropanol, butanol, and propylene glycol methoxy alcohol; ketone compounds such as methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, and dipropyl ketone; acetate compounds such as methyl acetate, ethyl acetate, butyl acetate, and propylene glycol methoxy acetate; cellulosolve compounds such as methyl cellulosolve, ethyl cellulosolve, and propyl cellulosolve; and hydrocarbon compounds such as hexane, heptane, benzene, toluene, and xylene. These may be used individually or in combination of two or more, but are not limited thereto.

[0040] The polymer coating layer 120 may be formed by applying a pretreatment such as corona treatment or plasma treatment to one surface of the adhesive film in order to improve adhesion, and then directly contacting the pretreated surface. The pretreatment is not limited to corona treatment or plasma treatment, and conventional or subsequently developed pretreatment processes can be used as long as they do not impair the objectives of the present invention.

[0041] According to one embodiment of the present invention, when the thickness of the polymer coating layer exceeds 0.3 μm but is less than 3.0 μm, it has advantages in that it absorbs infrared light from incoming solar energy while maintaining appropriate visible light transmittance, thereby blocking solar energy. Below this range, the polymer coating layer is excessively thin, which may result in reduced solar energy blocking and absorption characteristics, making it difficult to achieve thermal insulation and low reflection effects. Above this range, the polymer coating layer is excessively thick, resulting in high light energy absorption, which may make it difficult to maintain a clear field of view.

[0042] Base material 130 The laminate may further include a base material 130. The base material 130 serves to structurally support the components included in the laminate and the functional film containing it.

[0043] In one or more embodiments, the substrate 130 can be a rigid material such as glass, or it can be realized as a substrate film having flexible properties. When the base material 130 is flexibly realized, specific examples of materials applicable to the base material film include thermoplastic resins such as polyester resins like polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; cellulosic resins like diacetylcellulose and triacetylcellulose; polycarbonate resins; acrylic resins like polymethyl (meth)acrylate and polyethyl (meth)acrylate; styrene resins like polystyrene and acrylonitrile-styrene copolymers; polyolefin resins like polyethylene, polypropylene, polyolefin having a cyclo- or norbornene structure, and ethylene-propylene copolymers; vinyl chloride resins; amide resins like nylon and aromatic polyamides; imide resins; polyethersulfone resins; sulfone resins; polyetheretherketone resins; sulfurized polyphenylene resins; vinyl alcohol resins; vinylidene chloride resins; vinyl butyral resins; alkylate resins; polyoxymethylene resins; and epoxy resins. Films made from blends of the above thermoplastic resins can also be used. Furthermore, films made of thermosetting resins or UV-curing resins such as (meth)acrylic, urethane, acrylic-urethane, epoxy, and silicone can also be used. The thickness of such transparent optical films may be appropriately determined, but generally it may be set to 1 μm to 500 μm. In particular, considering factors such as strength, workability (including handling) and thinness, 1 μm to 300 μm is preferred, and 5 μm to 200 μm is more preferred.

[0044] Such a base film may contain one or more appropriate additives. Examples of additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, color inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, and colorants. The base film may have a structure that includes various functional layers on one or both sides of the film, such as a hard coating layer, an anti-reflective layer, or a gas barrier layer. The functional layers are not limited to those described above and may include various functional layers used in the industry and known to the public, depending on the application.

[0045] Furthermore, the base film may be surface-treated as needed. Examples of such surface treatments include dry treatments such as plasma treatment, corona treatment, and primer treatment, and chemical treatments such as alkaline treatment including saponification.

[0046] others Referring to Figure 2, according to yet another embodiment of the present invention, the laminate may further include a protective film 140 and / or an adhesive film 150.

[0047] Protective film 140 The protective film 140 is for protecting the laminate from subsequent processes and the external environment, and may be used as a multilayer structure in which one or more protective films are laminated, or in combination with other functional layers. The protective film may, but is not limited to, be located on the outermost surface to perform its protective function.

[0048] In one or more embodiments, the protective film 140 may contain one or more selected from the group consisting of polyethylene terephthalate (PET), polyethylene isophthalate (PEI), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), diacetyl cellulose, triacetyl cellulose (TAC), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polymethyl acrylate (PMA), polymethyl methacrylate (PMMA), polyethyl acrylate (PEA), polyethyl methacrylate (PEMA), and cyclic olefin polymer (COP). In particular, it is even more preferable that the resin film be made from a resin film with excellent properties such as transparency, mechanical strength, thermal safety, moisture shielding, and isotropy, such as polyesters like polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate; celluloses like diacetylcellulose and triacetylcellulose; polycarbonates; or polymethyl methacrylate.

[0049] Adhesive film 150 The adhesive film 150 may further contain conventional or subsequently developed adhesives, and in one or more embodiments, acrylic adhesives, rubber adhesives, silicone adhesives, urethane adhesives, polyvinyl alcohol adhesives, polyvinylpyrrolidone adhesives, polyacrylamide adhesives, cellulose adhesives, vinyl alkyl ether adhesives, etc., can be used. The adhesive film 150 is not particularly limited as long as it has adhesive strength and viscoelasticity, but from the viewpoint of availability, it may preferably be an acrylic adhesive, and may contain, for example, a (meth)acrylate copolymer, a crosslinking agent and a solvent. The adhesive film may be positioned at the innermost bottom of the laminate and in contact with the adherend, but is not limited thereto.

[0050] The aforementioned crosslinking agent can be a conventional or subsequently developed crosslinking agent, and may include, for example, polyisocyanate compounds, epoxy resins, melamine resins, urea resins, dialdehydes, methylol polymers, etc. Preferably, it may include a polyisocyanate compound.

[0051] The solvent may include common solvents used in the field of resin compositions, such as alcohol compounds like methanol, ethanol, isopropanol, butanol, and propylene glycol methoxy alcohol; ketone compounds like methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, and dipropyl ketone; acetate compounds like methyl acetate, ethyl acetate, butyl acetate, and propylene glycol methoxy acetate; cellulosolve compounds like methyl cellulosolve, ethyl cellulosolve, and propyl cellulosolve; and hydrocarbon compounds like hexane, heptane, benzene, toluene, and xylene. These can be used individually or in combination of two or more.

[0052] The thickness of the adhesive film 150 may be appropriately determined depending on the type of resin that acts as the adhesive body, the adhesive strength, and the environment in which the adhesive film 150 is used. In one embodiment, the adhesive film 150 may be 5 to 25 μm thick, preferably 15 to 25 μm, and more preferably 20 to 25 μm thick, in order to ensure sufficient adhesive strength and minimize the thickness of the laminate, but is not limited thereto.

[0053] <Functional Film> The present invention includes, in addition to the laminate, a functional film containing the laminate. Furthermore, the present invention may apply the functional film to a vehicle, such as a sunroof, left and right side and rear windows, or to glass used in building fixtures, but is not limited thereto.

[0054] A functional film according to one embodiment of the present invention includes both an energy-reflective metal vapor-deposited layer 110 and an energy-absorbing polymer coating layer 120, thereby preventing visual field confusion due to reflection when perceiving the external environment, while simultaneously ensuring energy efficiency.

[0055] Total solar energy transmittance (T) TS The visible light transmittance is 25 to 30%, and the visible light reflectance measured on the inside is 25% or less, preferably 15 to 25%.

[0056] Total solar energy transmittance (T) TS) is the sum of solar radiation transmittance (Te), which is the energy of sunlight (energy) that directly passes through the substrate and enters the room, and re-radiated energy (qi), which is the energy that is absorbed by the substrate and then re-radiated into the room. According to one embodiment of the present invention, the metal vapor deposition layer 110 is located on the outer surface of the laminate, resulting in a high outer reflectance and ensuring an appropriate transmittance. TS By lowering the value, it is possible to ensure energy efficiency for indoor heating and cooling.

[0057] The polymer coating layer 120 has the property of absorbing light energy, and by absorbing the energy that has passed through the metal vapor deposition layer 110, it satisfies the visible light transmittance of the present invention and reduces the indoor reflectance, thereby obtaining low reflectivity characteristics, i.e., an effect of improving field of view obstruction. Furthermore, if the visible light transmittance is less than 25%, there is a problem that it is excessively low and makes it difficult to secure a clear field of view.

[0058] Therefore, when the conditions for the laminate and the functional film containing the same according to the present invention are met, high indoor energy efficiency and an improvement in field of view obstruction can be obtained. [Examples]

[0059] [Modes for carrying out the invention] The following experimental examples, including specific embodiments and comparative examples, are presented below to aid in understanding the present invention. These examples are merely illustrative and do not limit the scope of the attached claims. It is obvious to those with ordinary skill in the art that various changes and modifications to the embodiments are possible within the scope of the present invention and the technical concept, and such variations and modifications naturally fall within the scope of the attached claims. Unless otherwise specified, "%" and "parts" in the examples refer to "mass%" and "parts by mass," respectively.

[0060] Manufacturing example: Manufacturing of polymer coating layer composition The polymer coating layer was prepared by mixing coating solution 1 and coating solution 2 in a 1:1 ratio. Coating solution 1 consisted of a mixture of 60% by weight of (Ethenyl benzenesulfonic acid homopolymer compound with 2,3-dihydrothieno[3,4-b]-1,4-dioxin homopolymer (water based)), 20% by weight of ethanol, and 20% by weight of deionized water, based on the total weight of coating solution 1. Coating solution 2 consisted of a mixture of 1.0% by weight of polyester resin (25% solid powder, water based), 75% by weight of ethanol, and 24% by weight of deionized water, based on the total weight of coating solution 2.

[0061] Manufacturing of the laminates of Examples 1 to 3 As shown in Table 1 below, the laminate of the example was manufactured to include a metal vapor deposition layer formed on the outer surface facing the light source, and a polymer coating layer on the lower surface of the metal vapor deposition layer.

[0062] Specifically, using a heat-shielding film (product name: NABIL) manufactured by MSWAY, which has a metal vapor-deposited layer coated on polyethylene terephthalate (PET) with a thickness of 125 μm, the polymer coating layer composition according to the above manufacturing example was coated to a thickness of 0.5 μm on the lower surface of the metal vapor-deposited layer (Example 1), the polymer coating layer composition according to the above manufacturing example was coated to a thickness of 0.5 μm on the lower surface of the base film (PET) (Example 2), or the polymer coating layer composition according to the above manufacturing example was coated to a thickness of 0.5 μm on both sides of the base film (PET) (Example 3). After drying in an oven for 5 to 10 minutes, an adhesive film was used to which the thickness after drying was 25 μm, and the film was attached to the bottom surface to form the laminate of the present invention.

[0063] Manufacturing of the laminates of Comparative Examples 1 to 4 As shown in Table 2 below, comparative laminates were manufactured.

[0064] Specifically, in Comparative Example 1, a laminate was manufactured by laminating the metal vapor-deposited layer to the lower surface of the polymer coating layer according to the lamination order shown in Table 2 below. Furthermore, using MSWAY's heat-shielding film (NABIL) (Comparative Example 4), which has a metal vapor-deposited layer coated on polyethylene terephthalate (PET) with a thickness of 125 μm compared to Example 1, the polymer coating layer composition according to the above manufacturing example was coated to a thickness of 0.3 μm (Comparative Example 2), or the polymer coating layer composition according to the above manufacturing example was coated to a thickness of 3.0 μm (Comparative Example 3), and the laminate was dried in an oven for 5 to 10 minutes to form the laminate of the present invention.

[0065] The stacking order of the above-mentioned examples and comparative examples is shown in Tables 1 and 2 below, respectively.

[0066] [Table 1]

[0067] [Table 2]

[0068] Experimental example Based on the following test equipment, measurement equipment, and measurement environment, the total solar energy transmittance (%) was calculated. TS The visible light transmittance (%), outer visible light reflectance (%), and inner visible light reflectance (%) were measured and are shown in Table 3 below.

[0069] (1) Total solar energy transmittance (T TS , %) The total solar energy transmittance was calculated based on the ISO 13837:2021 standard, utilizing values ​​such as solar radiation transmittance, solar radiation reflectance, and re-radiated energy measured using a UV-VIS-NIR Spectrophotometer, Perkin-Elmer, Lambda 950 & 1050, and USA equipment.

[0070] (2) Visible light transmittance, visible light reflectance (outside, inside) Visible light transmittance and visible light reflectance on the exterior and interior were measured using a UV-VIS-NIR Spectrophotometer, Perkin-Elmer, Lambda 950 & 1050, and USA equipment.

[0071] [Table 3]

[0072] Referring to the experimental data in Table 3 above, the laminate according to the present invention and the functional film containing it have a total solar energy transmittance (T). TS The values ​​were measured to be 20% or less, with a visible light transmittance of 25 to 30% and a visible light reflectance of 25% or less measured on the inside. In contrast, in Comparative Example 1, where the stacking order of the metal vapor deposition layer and polymer coating layer does not conform to the present invention, Comparative Example 2, where the polymer coating layer thickness is 0.3 μm, and Comparative Example 4, which does not include a polymer coating layer, the total solar energy transmittance, visible light transmittance, and visible light reflectance measured on the inside fall outside the above range. For reference, in the case of Comparative Example 3, where the polymer coating layer thickness is 3.0 μm, it can be confirmed that the total solar energy transmittance and visible light reflectance measured on the inside are lower compared to the other comparative examples, which can be attributed to the polymer coating layer being excessively thick and absorbing light energy. In this case, it may actually be difficult to secure a clear field of view.

[0073] Therefore, in the present invention, it can be confirmed that the stacking order of the metal vapor deposition layer and the polymer coating layer contained in the laminate, and the appropriate thickness of the polymer coating layer, have a significant effect on the total solar energy transmittance, visible light transmittance, and visible light reflectance measured on the inside. [Industrial applicability]

[0074] The laminate and functional film containing the same according to the present invention may improve energy economy by effectively shielding total solar energy. [Explanation of Symbols]

[0075] 110:Metal deposition layer 120: Polymer coating layer 130: Base material 140: Protective film 150: Adhesive film

Claims

1. A metal vapor-deposited layer formed on the outer surface facing the light source; and The metal vapor deposition layer includes a polymer coating layer formed on the lower surface of the metal vapor deposition layer, A laminate in which the thickness of the polymer coating layer is greater than 0.3 μm and less than 3.0 μm.

2. The polymer coating layer is made of polyaniline, polythiophene, polyethylenedioxythiophene (PEDOT), polyimide, polystyrene sulfonate (PSS), polypyrrole, polyacetylene, poly(p-phenylene), poly(p-phenylene) The laminate according to claim 1, comprising one or more selected from sulfide, poly(p-phenylenevinylene), polythiophene poly(thienylenevinylene), poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), (PEDOT:PSS), and combinations thereof.

3. The laminate according to claim 1, wherein the laminate further comprises a substrate, and the polymer coating layer is included on one or both sides of the substrate.

4. The laminate according to claim 1, wherein the metal vapor deposition layer comprises one or more selected from Ag, Cu, Au, Al, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Cd, In, Sn, Hf, Ta, W, Re, Os, Ir, Pt, Tl, Pb, Bi, Ga, Ge, Sb, Ac, Th, and alloys thereof.

5. The laminate according to claim 1, further comprising one or more selected from a protective film and an adhesive film.

6. A functional film comprising a laminate according to any one of claims 1 to 5.

7. The total solar energy transmittance (T) of the aforementioned functional film. ＴＳ The functional film according to claim 6, characterized in that ) is 20% or less.

8. The total solar energy transmittance (T) of the aforementioned functional film. ＴＳ The functional film according to claim 7, characterized in that ) is 15 to 20%.

9. The functional film according to claim 6, characterized in that the visible light transmittance of the functional film is 25 to 30%.

10. The functional film according to claim 6, characterized in that the visible light reflectance measured on the inside of the functional film is 25% or less.

11. The film according to claim 10, characterized in that the visible light reflectance measured on the inside of the functional film is 15 to 25%.

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