Liquid resin composition

Abstract

The objective is to provide a liquid resin composition. [Solution] The present invention provides a liquid resin composition comprising (a) 20 to 80 wt% of a resin selected from the group consisting of self-crosslinking acrylic resins and polyurethane resins, with a Tg of -20 to 25°C, (b) 1 to 10 wt% of heat-shielding fine particles, and (c) 5 to 25 wt% of an aqueous solvent. The liquid resin composition can be applied to a substrate and dried to form a film. A film made from the liquid resin composition of the present invention can maintain a high visible light transmittance while cutting infrared and ultraviolet rays, thus having visual transparency and the effect of blocking solar radiant heat and ultraviolet rays. As a result, the present invention can achieve objectives such as naturally lowering indoor temperature, saving energy and reducing carbon dioxide emissions, extending the lifespan of articles, and providing surface protection. Furthermore, the film of the present invention is convenient in terms of application and removal operations, leaves no peeling marks on the surface of the applied object, and has the additional effect of cleaning the surface of the article after peeling.

Description

Technical Field

[0001] The present invention relates to an easily peelable film, and particularly to a liquid resin composition capable of forming a liquid heat-insulating film, but the present invention is not limited thereto.

Background Art

[0002] Currently, many buildings adopt glass doors and windows, which can not only create a beautiful appearance but also take in sunlight to brighten the interior. However, excessive light irradiation accelerates the deterioration of articles inside the building such as furniture, ornaments, carpets, etc., shortening the life of the articles. This situation is also commonly seen in the automotive field. When sunlight shines into the car, it causes glare problems during driving, and when it becomes excessively hot, there is a risk of the car window cracking.

[0003] Therefore, usually, for the purpose of heat insulation and ultraviolet cut-off, a heat-insulating film is attached to the windows of buildings or transportation tools. Generally, the heat-insulating film is a metal film made of a metal compound and can effectively exhibit functions such as blocking heat energy, infrared rays, and ultraviolet rays. However, if the metal film is continuously used for a certain period, the effect of the heat-insulating film may easily decrease due to oxidation or corrosion. Also, during the subsequent process of replacing the heat-insulating film, it is difficult to peel off, which may cause peeling marks or damage to the surface of the article.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In view of such conventional problems, the present invention provides a liquid resin composition that can be applied to the surface of an object, dried to form a film, and installed as various multilayer structures. The film can not only effectively block infrared light and ultraviolet light while maintaining a high visible light transmittance, but also has high flexibility, is easy to peel off, and the film of the present invention has no residue on the surface after peeling and also has the effect of cleaning the surface of the article after peeling. [Means for solving the problem]

[0005] Therefore, one aspect of the present invention provides a liquid resin composition comprising (a) 20 to 80 wt% of a resin selected from the group consisting of self-crosslinking acrylic resins and polyurethane resins, with a Tg of -20 to 25°C, (b) 1 to 10 wt% of heat-shielding fine particles, and (c) 5 to 25 wt% of an aqueous solvent.

[0006] According to at least one embodiment of the present invention, the heat-shielding fine particles are cesium tungsten oxide.

[0007] According to at least one embodiment of the present invention, the aqueous solvent is selected from the group consisting of water, short carbon chain esters, ethers, and alcohols.

[0008] According to at least one embodiment of the present invention, the composition further comprises an auxiliary agent selected from the group consisting of UV absorbers, UV stabilizers, thickeners, leveling agents, rheological agents, and defoaming agents.

[0009] According to at least one embodiment of the present invention, the auxiliary agent is a UV absorber or UV stabilizer and accounts for 1 to 3 wt% of the liquid resin composition.

[0010] According to at least one embodiment of the present invention, the auxiliary agent is a leveling agent and accounts for 0.01 to 7 wt% of the liquid resin composition.

[0011] According to at least one embodiment of the present invention, the auxiliary agent is a rheological agent and constitutes 0.1 to 5 wt% of the liquid resin composition.

[0012] According to at least one embodiment of the present invention, the auxiliary agent is an antifoaming agent and accounts for 0.05 to 3 wt% of the liquid resin composition.

[0013] Another aspect of the present invention provides a film that can be peeled from a substrate, formed by applying the above-mentioned liquid resin composition onto a substrate and drying it.

[0014] According to at least one embodiment of the present invention, the substrate is glass, polycarbonate, or acrylic resin.

[0015] According to at least one embodiment of the present invention, the film has a thickness of 10 to 50 μm.

[0016] According to at least one embodiment of the present invention, the film has a visible light transmittance of 70-90%.

[0017] According to at least one embodiment of the present invention, the film has an infrared cut rate of 60-99%.

[0018] According to at least one embodiment of the present invention, the film has an ultraviolet cut rate of 45 to 95%.

[0019] According to at least one embodiment of the present invention, the film has a solar heat gain coefficient (SHGC) of 0.4 to 0.67.

[0020] A further aspect of the present invention provides a multilayer structure comprising the above-mentioned film, which is a wall material, roofing material, window, or car window for a building or structure. [Effects of the Invention]

[0021] The film made of the liquid resin composition of the present invention can maintain a high visible light transmittance while cutting infrared and ultraviolet rays, so it has visual transparency and can block the radiant heat and ultraviolet rays of the sun. As a result, the present invention can achieve the purposes of naturally lowering the indoor temperature, saving energy and reducing carbon dioxide emissions, extending the life of articles, and providing a surface protection effect. In addition, the film of the present invention is convenient in terms of construction and peeling operations, has no peeling marks on the surface of the coated object, and has an accompanying effect of cleaning the surface of the article after peeling.

[0022] Here, embodiments of the technology of the present invention will be described merely as examples while referring to the drawings.

Brief Description of the Drawings

[0023] [Figure 1] It is a photograph of a film made of the liquid resin composition according to an embodiment of the present invention. [Figure 2] It is a schematic diagram of a continuous sunlight irradiation simulation device according to an embodiment of the present invention. [Figure 3] It is a graph showing the results of the temperature reduction performance of the film when continuously irradiated with sunlight according to an embodiment of the present invention. [Figure 4A] It is a graph showing the results of the temperature reduction performance according to the thickness of different films according to an embodiment of the present invention. [Figure 4B] It is a graph showing the results of the temperature reduction performance according to the thickness of different films according to an embodiment of the present invention. [Figure 4C] It is a graph showing the results of the temperature reduction performance according to the thickness of different films according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0024] It will be understood that each aspect of the present invention is not limited to the configurations, means and features shown in the drawings.

[0025] According to conventional drawing methods, various features and components in the figures are not drawn to actual scale. This drawing method is intended to best represent the specific features and components related to the present invention. Furthermore, the same or similar reference numerals in different drawings indicate the same or similar components or members.

[0026] The following embodiments should not be considered to unduly limit the invention. Those with ordinary skill in the art to which the invention pertains may modify and alter the embodiments discussed herein without departing from the spirit or scope of the invention, and such modifications and alterations will also be covered within the scope of the invention.

[0027] In this specification, unless otherwise indicated in the context, the terms “include,” “equip,” “have,” or “contain” are open-ended and non-restrictive and do not exclude other elements or steps of the method that are not explicitly stated. The singular terms “one” and “the” include references to the plural. The term “one or more” means “at least one” and can therefore include a single feature or mixture / combination. In this specification and the appended claims, unless otherwise specified, “provided on something” can be interpreted as being in direct or indirect contact with the surface of something through attachment or other means, and the identification of such surface shall be determined based on the semantics of the preceding / following paragraphs of the specification and common sense of the art to which this specification belongs.

[0028] The present invention provides a liquid resin composition comprising (a) 20 to 80 wt% of a resin selected from the group consisting of self-crosslinking acrylic resins and polyurethane resins, having a Tg (glass transition temperature, hereinafter abbreviated as Tg) of -20 to 25°C, (b) 1 to 10 wt% of heat-shielding fine particles, and (c) 5 to 25 wt% of an aqueous solvent.

[0029] Specifically, the resins in (a) 20-80 wt% are values ​​within the range between any two of the following values, for example, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, 60 wt%, 65 wt%, 70 wt%, 75 wt%, or 80 wt%, but are not limited to these. The Tg of the aforementioned resin is -20 to 25°C, and is within the range between any two of the following values, such as -20°C, -19°C, -18°C, -17°C, -16°C, -15°C, -14°C, -13°C, -12°C, -11°C, -10°C, -9°C, -8°C, -7°C, -6°C, -5°C, -4°C, -3°C, -2°C, -1°C, 0°C, 1°C, 2°C, 3°C, 4°C, 5°C, 6°C, 7°C, 8°C, 9°C, 10°C, 11°C, 12°C, 13°C, 14°C, 15°C, 16°C, 17°C, 18°C, 19°C, 20°C, 21°C, 22°C, 23°C, 24°C, and 25°C, but is not limited to these values.

[0030] Specifically, the (b) 1-10 wt% heat-shielding fine particles are, for example, within the range between any two of the following values, such as 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, or 10 wt%, but are not limited to these. Also, the (c) 5-25 wt% aqueous solvent are, for example, within the range between any two of the following values, such as 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, and 25 wt%, but are not limited to these.

[0031] According to one embodiment of the present invention, the resin can be selected from a variety of polymeric resins, including polyester, acrylic (acrylic acid) resin, modified acrylic resin, epoxy resin, organosilicon resin, polyurethane resin, fluorine-containing resin, starch, cellulose, or copolymers or mixtures thereof. In a preferred embodiment, the resin is selected from the group consisting of self-crosslinking acrylic resin and polyurethane resin, and more preferably, the resin is a polyurethane resin to have more ideal material compatibility, optical transparency, easy peelability and fingerprint resistance.

[0032] According to one embodiment of the present invention, the heat-shielding fine particles include titanium dioxide (TiO2), mica flakes (Mica), indium tin oxide (ITO), antimony tin oxide (ATO), tungsten oxide, or cesium tungsten oxide. In a preferred embodiment, the heat-shielding fine particles are cesium tungsten oxide to have more ideal light blocking and visible light transmission properties. According to one embodiment of the present invention, the particle size of the heat-shielding fine particles is 10 to 50 nm, and is within the range of any two of the following values, for example, 10 nm, 13 nm, 15 nm, 18 nm, 20 nm, 22 nm, 24 nm, 25 nm, 27 nm, 30 nm, 31 nm, 34 nm, 35 nm, 36 nm, 39 nm, 40 nm, 42 nm, 43 nm, 45 nm, 46 nm, 47 nm, 48 nm, 49 nm, and 50 nm, but is not limited to these.

[0033] As used herein, “aqueous solvent” means any solvent that is inert to other components of the present invention, satisfies environmental protection and safety and non-toxicity requirements, and can be used in an indoor air circulation environment. According to one embodiment of the present invention, the aqueous solvent is selected from the group consisting of water, short-carbon esters, ethers, and alcohols, for example, esters, alcohols, glime, propylene glycol monomethyl ether and propylene glycol mono-tert-butyl ether, ketones, and mixtures thereof. In some embodiments, water includes deionized water and / or distilled water. In some embodiments, the solvent is propylene glycol monomethyl ether (PGME), methanol, ethanol, glycol ethers (e.g., diethyl, tert-butyl ether, cyclic ether), glycol, ketone (e.g., acetone), or mixtures thereof. In some embodiments, the aqueous solvent is substantially free of volatile organic solvents such as aliphatic hydrocarbons, ethyl acetate, glycol ethers, and acetone (e.g., less than 1000 ppm, less than 100 ppm, less than 10 ppm, less than 1 ppm).

[0034] According to one embodiment of the present invention, the composition further comprises an auxiliary agent selected from the group consisting of UV absorbers, UV stabilizers, thickeners, leveling agents, rheological agents, and defoamers. Without being bound by any particular theory, the UV absorber or UV stabilizer can enhance the UV quad capability of the liquid window film. Also without being bound by any particular theory, the thickener, leveling agent, rheological agent, and defoamer can improve the stability of the coating film.

[0035] According to one embodiment of the present invention, the auxiliary agent may be a UV absorber or a UV stabilizer, the UV absorber or UV stabilizer accounting for 1 to 3 wt% of the liquid resin composition, for example, but not limited to, values ​​within the range between any two of the following values: 1 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt%, 2 wt%, 2.1 wt%, 2.2 wt%, 2.3 wt%, 2.4 wt%, 2.5 wt%, 2.6 wt%, 2.7 wt%, 2.8 wt%, 2.9 wt%, and 3 wt%.

[0036] According to one embodiment of the present invention, the auxiliary agent is a leveling agent, which is present in an amount of 0.01 to 7 wt% of the liquid resin composition, for example, but not limited to, a value within the range between any two of the following values: 0.01 wt%, 0.05 wt%, 0.1 wt%, 0.3 wt%, 0.5 wt%, 0.7 wt%, 0.9 wt%, 1 wt%, 1.3 wt%, 1.5 wt%, 1.7 wt%, 1.9 wt%, 2 wt%, 2.1 wt%. The levelsing agent accounts for t%, 2.3wt%, 2.5wt%, 2.5wt%, 2.7wt%, 3wt%, 3.1wt%, 3.3wt%, 3.5wt%, 3.7wt%, 3.9wt%, 4.1wt%, 4.3wt%, 4.5wt%, 4.7wt%, 4.9wt%, 5.1wt%, 5.3wt%, 5.5wt%, 5.7wt%, 5.9wt%, 6wt%, 6.1wt%, 6.3wt%, 6.5wt%, 6.7wt%, 6.9wt%, and 7wt%. According to a preferred embodiment of the present invention, the leveling agent accounts for 0.05 to 6.5wt% of the liquid resin composition.

[0037] As used herein, “rheological agent” refers to a compound or composition added to adjust the rheological properties of a formulation. For example, the rheological agent improves the sag resistance (also called anti-sagging) of the coating by rapidly increasing the viscosity after application, and improves the transportability and storage of the paint by preventing the sedimentation of pigments or other solids in the formulation. In some embodiments, the rheological agent may be an inorganic substance such as clay, fumed silica, and specialty clays (e.g., sepiolite, attapulgite, and smectite). In some embodiments, the rheological agent may be an organic substance such as cellulosic materials and synthetic materials (e.g., hydrophobic modified polyurethane, hydrophobic modified polyether, alkali-swelling emulsion, and castor oil thixotropic agent). According to one embodiment of the present invention, the auxiliary agent is a rheological agent, which is present in an amount of 0.1 to 5 wt% of the liquid resin composition, for example, but not limited to, a value within the range between any two of the following values: 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, 1 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt%. The rheological agent accounts for t%, 2wt%, 2.1wt%, 2.2wt%, 2.3wt%, 2.4wt%, 2.5wt%, 2.6wt%, 2.7wt%, 2.8wt%, 2.9wt%, 3wt%, 3.1wt%, 3.2wt%, 3.3wt%, 3.4wt%, 3.5wt%, 3.6wt%, 3.7wt%, 3.8wt%, 3.9wt%, 4wt%, 4.1wt%, 4.2wt%, 4.3wt%, 4.4wt%, 4.5wt%, 4.6wt%, 4.7wt%, 4.8wt%, 4.9wt%, or 5wt%. According to a preferred embodiment of the present invention, the rheological agent accounts for 0.2 to 4.5wt% of the liquid resin composition.

[0038] In this specification, "antifoaming agent" refers to a chemical additive that reduces and suppresses foam formation. The additive may consist of one or more compounds. According to one embodiment of the present invention, an example of the auxiliary agent is an antifoaming agent, which accounts for 0.05 to 3 wt% of the liquid resin composition, for example, but not limited to, a value within the range between any two of the following values: 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt%, 1 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt%, 2 wt%, 2.1 wt%, 2.2 wt%, 2.3 wt%, 2.4 wt%, 2.5 wt%, 2.6 wt%, 2.7 wt%, 2.8 wt%, 2.9 wt%, or 3 wt%. According to a preferred embodiment of the present invention, the defoaming agent accounts for 1 to 1.5 wt% of the liquid resin composition.

[0039] Another aspect of the present invention provides a film that can be peeled from a substrate after being applied to a substrate using the above-mentioned liquid resin composition and drying, the finished product of which is shown in Figure 1. According to one embodiment of the present invention, examples of the application method include roller application, brush application, and spray coating. In a preferred embodiment, the application method is spray coating to achieve a uniform and smooth coating surface. In a preferred embodiment, the film of the present invention is formed by an air-drying method at room temperature.

[0040] According to one embodiment of the present invention, the substrate can be glass, polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), nylon, or acrylic resin. In a preferred embodiment, the substrate is glass, polycarbonate, or acrylic resin.

[0041] According to one embodiment of the present invention, the film has a thickness of 10 to 50 μm, for example, but not limited to, a value within the range between any two of the following values: 10 μm, 12 μm, 14 μm, 15 μm, 18 μm, 20 μm, 23 μm, 25 μm, 27 μm, 29 μm, 30 μm, 31 μm, 33 μm, 35 μm, 38 μm, 40 μm, 43 μm, 45 μm, 46 μm, 48 μm, 49 μm, or 50 μm. According to some embodiments of the present invention, the thickness of the film is measured with a digital display type micrometer, more specifically, the present invention is measured with a Mitutoyo 543-706B digital display type micrometer.

[0042] The film according to the present invention can maintain a high visible light transmittance while cutting infrared and ultraviolet rays, and therefore has the effect of visual transparency and blocking solar radiant heat and ultraviolet rays. According to one embodiment of the present invention, the film has a visible light transmittance of 70-90%, for example, but not limited to, a value within the range between any two of the following values: 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, or 90%.

[0043] According to one embodiment of the present invention, the film has an infrared cut rate of 60-99%, for example, for any two of the following values, but not limited to: 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99%. According to one embodiment of the present invention, the film has an ultraviolet cut rate of 45-95%, for example, a value within the range between any two of the following values, but not limited to: 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, or 95%.

[0044] According to one embodiment of the present invention, the film has a solar heat gain coefficient (SHGC) of 0.4 to 0.67, for example, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, or 0.67. In this specification, the term "Solar Heat Gain Coefficient (hereinafter referred to as SHGC)" may also be called Total Solar Energy Transmittance, solar factor, or g-value, and refers to the ratio of the amount of solar heat gained in a room through a glass door, window, or glass curtain wall to the amount of solar heat incident on the glass door, window, or glass curtain wall member in the wavelength range of 300 to 2500 nm. Specifically, the solar portion of the solar heat gained in a room includes the amount of solar heat gained by radiation or transmission, and the amount of solar heat gained (secondary heat transfer) that is re-radiated into the room from solar radiation absorbed by the member. The Solar Heat Gain Coefficient is an index that indicates the amount of solar heat gained by glass, and the smaller the Solar Heat Gain Coefficient (for example, 0.6 or less), the higher the heat shielding performance.

[0045] A further aspect of the present invention provides a multilayer structure comprising the above-mentioned film, which is a multilayer structure for shielding and blocking infrared or ultraviolet rays from walls, roofing materials, windows, or car windows of buildings or structures. [Examples]

[0046] The present invention will be described in detail below with reference to examples. However, it should be understood that these examples are intended to aid in understanding the present invention and are not intended to limit the scope of the invention in any way.

[0047] <Selection and evaluation of resins> In this invention, various water-soluble resins with different Tg values ​​were selected, and the performance of spray coating with heat-shielding microparticles, film transparency, tactile feel, and easy-peel properties were measured using these water-soluble resins at specific concentrations, and the results are shown in Table 1. Samples were obtained by mixing and stirring the resin at the specific concentration, 5 wt% of heat-shielding microparticles, and water, and then filtering the mixture. More specifically, the material of the heat-shielding microparticles selected here was cesium tungsten oxide.

[0048] The aforementioned "performance of spray coating" refers to the evaluation of the film quality by applying a sample to glass using an air-pressure spray can and assessing the film quality visually and through actual operation. Specific inspection items include the presence or absence of clogging during the spray coating process, the presence or absence of cosmetic defects, and whether or not there are obvious inconsistencies in the formed film. If the formed film had no of the above defects, it was marked with "○", and if any of the above defects were present, it was marked with "×".

[0049] The aforementioned "transparency of the film" is determined by measuring the light transmittance (T%) and haze using a haze meter (BYK-Gardner haze-gard plus 4725). If the haze value is less than 3%, it is indicated as "O," and if the haze value is 3% or more, it is indicated as "X."

[0050] The aforementioned "tactile sensation" refers to visually checking the film surface by touching it with a finger to confirm the presence or absence of phenomena such as stickiness or fingerprints. The more severe these phenomena are, the higher this value will be. In practice, it is desirable for this value to be less than 2.

[0051] The aforementioned "easy peelability" was determined by applying general adhesive tape to the corner of the paint film after it had dried and then peeling it off. If it could be easily peeled off, it was indicated as "O," and if it was difficult to peel off, it was indicated as "X."

[0052] [Table 1]

[0053] As can be seen from Table 1, only when a self-crosslinking acrylic resin or polyurethane resin is used and its Tg is in the range of -20 to 25°C can a film made from it exhibit good easy-peel properties and have more ideal tactile performance. Conversely, when acrylic silicone resin, silicone acrylic resin, or fluororesin was used, the tactile properties and easy-peel properties of the film were inferior. Furthermore, even when a self-crosslinking acrylic resin was used, if its Tg was not within the above range, the tactile properties and easy-peel properties of the film were also inferior.

[0054] <Preparation of liquid resin composition and film> In view of the above results, the present invention obtained the liquid resin composition of this example by mixing a 5% cesium tungsten oxide solution, a 15 wt% aqueous solvent, and a 10 wt% auxiliary agent, and then adding them to a 70 wt% aqueous polyurethane resin and mixing and stirring. Furthermore, the above liquid resin composition was used as a coating for liquid window film, brushed onto a 3 mm thick piece of glass, and dried at room temperature for 2 hours to obtain a transparent heat-shielding film formed on the glass.

[0055] <Temperature reduction performance test using sunlight irradiation> Please refer to Figure 2. In this invention, the cooling performance of the film was tested under conditions simulating continuous sunlight irradiation. Figure 2 shows a continuous sunlight irradiation simulation apparatus 100, in which a halogen lamp 110 was used to simultaneously irradiate bare glass 120 and a sample 130 (i.e., glass covered with the film of the present invention), and then the temperature change in the space was monitored with a thermocouple device 140. The formula for calculating the temperature change is as follows.

[0056]

number

[0057] The experimental results are shown in Figure 3. When exposed to sunlight continuously for 8 hours, the heat shielding effect of the sample remained stable even after 4 hours, with a ΔT of approximately -6.4°C, indicating that the heat shielding effect of the film sample reached a certain level after about 4 hours. From this, it was found that the film of the present invention can maintain a stable cooling effect for at least 8 hours even when continuously exposed to constant sunlight, thereby reducing the penetration of radiant heat energy.

[0058] <Testing the properties of films of different thicknesses> In this example, samples with film thicknesses of 10, 20, 30.2, 31.6, and 40 μm were prepared using the method described above. For these samples, the cooling performance (test method as described above), ultraviolet cut rate, infrared cut rate, visible light transmittance, and SHGC were measured. A 3 mm thick bare glass was used as a control, and the results are shown in Tables 2 and 3 and Figures 4A to 4C.

[0059] The ultraviolet cut rate, infrared cut rate, and visible light transmittance were measured using a spectrophotometer (UV-Vis spectrophotometer Lambda 750 (PerkinElmer, USA)) or an LS182 light transmittance meter. Specifically, the calculation range for visible light transmittance was set to 380-780 nm, the calculation range for infrared transmittance was set to 780-2500 nm, or 940 or 1400 nm, and the wavelength for ultraviolet transmittance was set to 365 nm. The infrared cut rate is the percentage of infrared light that cannot pass through the transparent heat-shielding film structure. The formula is shown as follows.

[0060]

number

[0061]

number

[0062] SHGC is a percentage value representing the proportion of transmissible solar heat. SHGC is reference data obtained using an LS182 transmittance meter (solar film tester). The evaluation method for SHGC was based on the North American standard for evaluating doors and windows and the evaluation and labeling system established by the National Fenestration Rating Council (NFRC). Generally, the SHGC value is in the range of 0.25 to 0.8, and in a preferred embodiment of the present invention, the SHGC value was in the range of 0.4 to 0.67.

[0063] [Table 2]

[0064] [Table 3]

[0065] As can be seen from the above results, when the liquid resin composition of the present invention is made into a film, it exhibits good cooling performance, ultraviolet cut rate, infrared cut rate, visible light transmittance, and SHGC performance at various thicknesses. Even with relatively thick films, the visible light transmittance remains above 70%, and the excellent infrared and ultraviolet cut effect further enhances the heating effect. Films formed with standard thickness are transparent and bluish, and with a standard thickness, they exhibit an ultraviolet cut rate of over 70%, and even with a thinner film, they exhibit an ultraviolet cut rate of over 45%.

[0066] In short, the film made from the liquid resin composition of the present invention can maintain a high visible light transmittance while cutting infrared and ultraviolet rays, thus possessing visual transparency and the effect of blocking solar radiant heat and ultraviolet rays. As a result, the present invention can achieve objectives such as naturally lowering indoor temperature, saving energy and reducing carbon dioxide emissions, extending the lifespan of articles, and providing surface protection. Furthermore, the film of the present invention is convenient in terms of application and removal operations, leaves no residue on the surface of the coated object, and has the added benefit of leaving the surface of the article clean after removal.

[0067] All ranges provided herein are intended to include each specific range within a given range, and combinations of subranges between given ranges. Furthermore, any range expressed herein includes its endpoint unless otherwise explicitly stated. Thus, the range 1–5 includes, in particular, 1, 2, 3, 4, and 5, and subranges such as 2–5, 3–5, 2–3, 2–4, and 1–4.

[0068] Although the present invention has been described in detail above, what has been described above represents only preferred embodiments of the present invention and is not intended to limit the scope of implementation of the present invention. In other words, equivalent variations and embellishments made based on the claims of the present invention fall within the scope of patent protection of the present invention. [Explanation of Symbols]

[0069] 100 Continuous Sunlight Irradiation Simulation Devices 110 Halogen Lamp 120 Glass 130 samples 140 Thermocouple device

Claims

1. A liquid resin composition comprising: (a) 20 to 80 wt% of a resin selected from the group consisting of self-crosslinking acrylic resins and polyurethane resins, with a Tg of -20 to 25°C; (b) 1 to 10 wt% of heat-shielding fine particles; and (c) 5 to 25 wt% of an aqueous solvent.

2. The liquid resin composition according to claim 1, wherein the heat-shielding fine particles are cesium tungsten oxide.

3. The liquid resin composition according to claim 1, wherein the aqueous solvent is selected from the group consisting of water, esters with short carbon chains, ethers, and alcohols.

4. A liquid resin composition according to any one of claims 1 to 3, further comprising an auxiliary agent selected from the group consisting of UV absorbers, UV stabilizers, thickeners, leveling agents, rheological agents, and defoaming agents.

5. The liquid resin composition according to claim 4, wherein the auxiliary agent is a UV absorber or a UV stabilizer and accounts for 1 to 3 wt% of the liquid resin composition.

6. The liquid resin composition according to claim 4, wherein the auxiliary agent is a leveling agent and accounts for 0.01 to 7 wt% of the liquid resin composition.

7. The liquid resin composition according to claim 4, wherein the auxiliary agent is a rheological agent and accounts for 0.1 to 5 wt% of the liquid resin composition.

8. The liquid resin composition according to claim 4, wherein the auxiliary agent is an antifoaming agent and accounts for 0.05 to 3 wt% of the liquid resin composition.

9. A film that can be peeled from a substrate, formed by applying a liquid resin composition according to any one of claims 1 to 3 onto a substrate and drying it.

10. The film according to claim 9, wherein the substrate is glass, polycarbonate, or acrylic resin.

11. The film according to claim 9, having a thickness of 10 to 50 μm.

12. The film according to claim 9, having a visible light transmittance of 70 to 90%.

13. The film according to claim 12, having an infrared cut rate of 60 to 99%.

14. The film according to claim 13, having an ultraviolet cut rate of 45 to 95%.

15. The film according to claim 14, having a solar heat gain coefficient (SHGC) of 0.4 to 0.

67.

16. A multilayer structure comprising the film described in claim 9, which is a wall material, roofing material, window or car window of a building or structure.

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