KR102256724B1 - Film having light-shielding and heat insulation according to temperature - Google Patents

Abstract

The present invention relates to a film having light-shielding properties and thermal insulation properties depending on temperature.
In more detail, the substrate portion; A pattern portion formed by printing a molten phase change material on one surface of the substrate portion in a pattern shape; And a coating portion formed by coating the pattern portion by applying an ultraviolet-curable resin to cure or a dry laminating method using an adhesive.

Description

Film having light-shielding and thermal insulation properties according to temperature {FILM HAVING LIGHT-SHIELDING AND HEAT INSULATION ACCORDING TO TEMPERATURE}

The present invention relates to a film having light-shielding properties and thermal insulation properties depending on temperature.

In more detail, the substrate portion; A pattern portion formed by printing a molten phase change material on one surface of the base portion in a pattern shape; And a coating portion formed by coating the pattern portion by applying an ultraviolet-curable resin to cure or a dry laminating method using an adhesive. It relates to a film having light-shielding properties and heat insulating properties according to temperature.

Recently, as the interior of buildings has become more advanced, more and more buildings are constructed with walls made of glass. Glass applied to buildings has high light transmittance and increases the interior illumination. However, since there is a lot of heat in and out, a heat shielding film that blocks infrared rays is attached or two or three layers of glass are used to block the outside heat. Insulated double-glazed glass with vacuum is used.

However, glass has a disadvantage in that the inside can be seen from the outside of a building or vehicle, and a reflective film is attached to compensate for this, so that the outside is visible from the inside but the inside is not clearly seen from the outside. Nevertheless, it has the disadvantage of being able to see the inside well when viewed from the outside because the inside illumination is higher than the outside at night.

In addition, in winter, there are many cases where the temperature difference between indoors and outdoors is 25°C or more, and in particular, when the temperature difference is 30°C or more and the internal relative humidity is 40% or more, there is a disadvantage of causing condensation.

Accordingly, the present inventor completed the present invention by developing a film having light-shielding property and heat insulation property as a film attached to glass by utilizing a phase change material.

According to the prior invention, claim 1 of'Republic of Korea Patent Registration No. 10-1508490 (Agricultural film composition with improved thermal insulation and thermal insulation properties and agricultural film produced therefrom)' includes (a) ethylene vinyl acetate ( EVA) For 100 parts by volume of the resin, (b) 20 to 50 parts by volume of one or more components selected from surface-modified hydrophilic aerogels and silylated aerogels as the second component, and (c) the third component. Ethylene vinyl acetate (EVA) resin grafted with maleic anhydride polymer (EVA-g-MAH) 2 to 8 parts by volume and (d) one or more components selected from polyethylene wax and silicone modified polyethylene wax as the fourth component 1 to It has been described for an agricultural film composition having improved thermal insulation and thermal insulation properties comprising 2 parts by volume. However, the phase change material used in the present invention is not used.

Korean Patent Registration No. 10-1508490 (2015.03.30)

The technical problem of the present invention is to provide a film having light-shielding properties and thermal insulation properties according to temperature.

In more detail, the substrate portion; A pattern portion formed by printing a molten phase change material on one surface of the base portion in a pattern shape; And a coating portion formed by coating the pattern portion by applying an ultraviolet curable resin to cure it or a dry laminating method using an adhesive to provide a film having light-shielding properties and heat insulating properties according to temperature.

The present invention, the base portion; A pattern portion formed by printing a molten phase change material on one surface of the base portion in a pattern shape; And it is intended to solve the technical problem by providing a film having light-shielding properties and heat insulation properties according to temperature including a coating portion formed by coating the pattern portion by applying an ultraviolet curable resin to cure it or by coating it by a dry laminating method using an adhesive.

In the present invention, the phase change material is one or more of octadecane (C ₁₈ H ₃₈ ), icosan (C ₂₀ H ₄₂ ) or caprolactone (C ₆ H ₁₀ O ₂ ), and is mixed with an ultraviolet color change pigment to pattern It is intended to solve the technical problem by providing a film having light-shielding properties and thermal insulation properties characterized by printing in a shape.

The present invention aims to solve the technical problem by providing a film having light-shielding property and heat insulation property according to temperature, characterized in that the pattern portion is printed by a silk screen printing method or a gravure printing method.

In the present invention, the pattern shape is a dot type, a grid type, a stripe type, a logo or a pattern pattern, and the thickness of the pattern coating is printed in 10 to 50 μm by adjusting the thickness of the mesh of the silk screen or the depth of the gravure roll. It aims to solve the technical problem by providing a film having light-shielding properties and heat insulation properties according to the temperature.

The present invention relates to a film having light-shielding properties and thermal insulation properties according to temperature, and more particularly, to a substrate portion; A pattern portion formed by printing a molten phase change material on one surface of the base portion in a pattern shape; And it is possible to provide a film having light-shielding properties and thermal insulation properties according to temperature including a coating portion formed by coating the pattern portion by applying an ultraviolet-curable resin to cure it or by coating it by a dry laminating method using an adhesive.

1 is a diagram schematically showing a method for manufacturing a film according to the present invention.
2 is a view of a pattern portion formed by printing a phase change material melted on one surface of a substrate portion according to the present invention in a pattern shape.
3 is a view showing the principle of shielding the field of view of the film according to the present invention.

Terms or words used in this specification and claims should not be construed as being limited to their usual or dictionary meanings, and that the inventor can appropriately define the concept of terms in order to describe his own invention in the best way. Based on the principle, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention.

Therefore, the matters described in the embodiments, reference examples, and drawings described in the present specification are only the most preferable examples of the present invention, and do not represent all the technical ideas of the present invention, so that they can be replaced at the time of application. It should be understood that there may be various equivalents and variations.

Example 1. Preparation of a film having light-shielding property and heat insulation according to temperature

1) Base

In the present embodiment, the base portion is a flat plastic plate having flexibility made of a polymer of a material such as PET (polyest), PVC (polyvinyl chloride), PVB (polyvinyl butyral), and PC (polycarbonate), but is not limited thereto.

2) A pattern part formed by printing a phase change material melted on one side of the substrate in a pattern shape

① Phase change material

A phase change material accumulates a large amount of thermal energy or releases stored thermal energy through a phase change process.

A phase change substance is a substance that accumulates heat or releases stored heat through a kind of physical change process in which a substance changes from one state to another, such as a solid to a liquid state and a liquid to a solid state. During the phase change process, all substances change the physical arrangement of molecules, not chemical reactions such as chemical bonding or formation.

When the external temperature rises, the phase change material reaches its own melting point. At this time, this material absorbs a certain amount of heat known as melting enthalpy as the phase changes from a solid state to a liquid state. This material stays at a constant temperature even though heat is applied. Conversely, when the external temperature drops below the melting point of the phase change material, the phase change material changes its phase from a liquid state to a solid state and releases stored heat.

Phase change materials can be largely classified into organic and inorganic substances, and 4,000 types are classified as phase change substances, but there are about 200 substances that are practically applicable. Examples of organic substances include substances such as tetradecane, octadecane, and nonadecane in the hydrocarbon series consisting of carbon and hydrogen, and examples of inorganic substances include calcium chloride in the form of a hydrate in which six water molecules are bonded.

Preferably, as a paraffin-based aliphatic hydrocarbon, octadecane (C ₁₈ H ₃₈ ) has a melting point of 28 to 30°C, icosan (C ₂₀ H ₄₂ ), a melting point of 52 to 56°C, and caprolactone (C ₆ H ₁₀ O ₂ ) melting point 17 A phase change material such as ~19°C is possible, and the phase change material is melted by mixing a UV-chromic pigment having UV blocking properties with these phase change materials.

In addition, depending on the application, hexadecane, dodecane, as well as dodecanol, and many other fatty acids are possible, but in the case of fatty acids, octadecane, icosan, and caprolactone are preferably used due to their peculiar smell.

② Pattern part formed by printing a phase change material melted on one side of the base part in a pattern shape

At room temperature, a solid phase change material is heated to a temperature above the melting point, and silk screen printing or gravure printing is performed on one side of the substrate in a viscous liquid state. In addition, by coating to prevent the printed phase change material from being lost, a film having light-shielding properties and thermal insulation properties is obtained.

Silk-screen printing is a type of stencil printing method similar to a dung board. A letter or picture is formed on a rough-grained silk cloth to block the filtration of the printing paint, and the cloth applied to a simple frame is printed using a rubber roller. . There are many ways to make a mold, but in the case of simple characters or line drawings, either directly draw shellac varnish on silk or paint the shellac varnish on sulfuric paper with hair oil and cut the outline with a knife. B. Put the removed sulfuric acid paper on the silk and heat it from the back side with an iron, and the mold will stick to the silk. In the case of complex drawings or small characters, a photoresist solution mixed with gelatin and potassium dichromate is applied on silk to print positives on dried ones, and developed with hot water to dissolve and remove unsensitized gelatin to form a mold. In addition, there is a method of making a mold by transferring the printed material onto a silk cloth with photosensitive material attached to a carbon tissue, and then developing it. Preferably, the phase change material of this embodiment is printed through silkscreen printing.

Gravure printing is a photolithography method in which ink is smeared on the points engraved on a metal cylinder, and the metal cylinder rotates so that ink is smeared on the film surface. The color density is determined by the depth of the point, and the color type depends on the number of cylinders used in the entire process. Since the supplied printing medium is generally in the form of a roll or film, it is suitable for high-speed high-volume printing with photographic quality. Since the ink is solvent-related, it is also suitable for printing cellophane and polyethylene. Preferably, the phase change material of this embodiment is printed on the film through gravure printing.

In printing the phase change material, it is possible to print the pattern shape as dot type, grid type, stripe type, logo, or pattern, and the thickness of the pattern coating film is 10~ by adjusting the thickness of the silk screen or the depth of the gravure roll. It can be adjusted up to 50㎛.

In addition, in coating so that the phase change material is not melted by heat and flows or is lost, it is preferable to maintain a predetermined distance between the printed part and the non-printed part.

2 is a view of a pattern portion formed by printing a phase change material melted on one surface of the substrate portion in a pattern shape. Referring to FIG. 2, it is a pattern part drawing formed by printing a phase change material melted in the form of ① grid, ② dot, ③ stripe, or ④ logo pattern on one side of the substrate.

That is, even if it is printed with a thickness of 50 μm, when the area is 100 cm2 or more, when the phase change material is completely melted, it reaches 5 ml and is swung downward. If cooled in this state, it is difficult to achieve the original purpose.

Therefore, the part printed with the phase change material may be a straight line in the horizontal direction, but it is preferable not to exceed 3 cm in the vertical direction. If a phase change material of 10 cm or more is to be printed in the vertical direction, it is preferable to prevent the phase change material from melting and flowing to the lower portion of the printed surface by placing a space in which the phase change material is not printed as shown in FIG. 2.

3) Coating part formed by coating the pattern part by a non-heat coating method, that is, a method of applying and curing an ultraviolet curable resin or a dry laminating method using an adhesive

After printing the phase change material, a method of curing by applying an ultraviolet curable resin or a method of laminating a film may be used.

In general, a heat laminating method using an adhesive is appropriate because the phase change material melts and the printed pattern may be damaged or deformed.

The method of applying and curing an ultraviolet curable resin is a resin having a property of polymerization and curing by ultraviolet irradiation, and is prepared by mixing an acrylic unit and an ultraviolet curing catalyst with a polyurethane resin, an epoxy resin, or a polyester resin.

At this time, if a lot of units are contained, the viscosity is low, the odor is strong, the curing speed is accelerated, the cured product is hard, and the volume decreases a lot. When a lot of polyurethane resin, epoxy resin, or polyester resin that hardly reacts with the acrylic unit is contained, the curing process or the physical properties of the cured product are reversed. This cured resin has high hardness, excellent elasticity, and is crosslinked to form a network structure.

Laminating refers to a technique of applying a film on the surface of an ID card or various printed materials to make it gloss and prolong its lifespan by coating a film. The film used at this time is called a laminating film. However, since the phase change material may be melted when heat is applied, a protective coating was performed using a dry laminating method using an adhesive.

4) Effects of the manufactured film (light-shielding and thermal insulation)

When the film according to the present invention is attached to the glass surface, the film is warmed by sunlight, and the printed translucent phase change material is melted to become transparent, and it is possible to obtain light transmittance. As the temperature of the glass surface decreases, the phase change material becomes translucent, making it impossible to check the indoors outdoors.

In addition, since the phase change material layer printed on the film during the day becomes transparent and absorbs and stores a certain amount of energy, it has a high heat capacity and low thermal conductivity compared to conventional glass, so it has an effect of keeping warm and preventing condensation.

① Light-shielding

If the principle of visual field shielding is described in detail with reference to FIG. 3, the indoor space is relatively low in illuminance during the day, so it is possible to shield the field of view, but in the case of night, the phase change material changes to a solid and becomes translucent. In this case, indoors with a close focal length, the outdoor can be viewed through a transparent area where the phase change material is not printed, but outdoors, the viewing angle for the transparent area is small, so that indoors cannot be seen.

3 is a view showing the principle of shielding the field of view of the film according to the present invention.

Referring to FIG. 3, the distance d1 from the room to the point where the film is attached is 1m, the transparent area of the film is 3cm, and the viewing angle is atan(0.03/1) = 1.72°. The height d4 of is 11×0.33, which corresponds to 33cm.

If d1 is 50cm, atan(0.03/0.5) = 3.43° and d4 is 11×0.658, which is about 68cm. However, when looking indoors from the outside 10m away, the viewing angle is atan(0.03/10)=0.17°, and the object at a distance of 1m from the film surface is 11×0.33, so only 3cm or less can be seen.

② Insulation

Since the material printed between the film layers becomes transparent and absorbs a certain amount of heat, even if the external heat source disappears, it retains a certain amount of heat, thus retaining the heat retention effect.

The thermal conductivity of the plate glass is 0.75W/mK, but the material printed between the film layers is 0.18~0.36W/mK, so when the film is attached, the insulation effect is superior to that of glass. Therefore, condensation can be reduced even when the temperature difference between indoors and outdoors in winter exceeds 30°C (indoor temperature 20°C, outside temperature -10°C).

Experimental Example 1. Near infrared transmittance and measurement

After measuring the transmittance in the range of 400 to 1300 nm using the Shimadzu's UV-3600 model, the change in transmittance according to the wavelength was measured. In addition, in the transmittance measurement result, the transmittance was measured in the range of 800 to 1300 nm and then integrated and quantified as a near-infrared transmittance.In the transmittance measurement result, the transmittance was measured in the range of 380 to 750 nm, and then integrated, and quantified as the transmittance of visible light.

Near infrared and visible light transmittance
Film 1
(Silk screen printing)
Film 2
(Gravure printing)
Glass
Near infrared transmittance (%)
10.3
27.4
92.1
Visible light transmittance (%)
14.2
30.3
90.6

As for the phase change material of the film, it can be seen that the silkscreen printing group, the gravure printing group, and the control group have a significantly lower transmittance in the near-infrared region of 800 nm to 1300 nm, thereby effectively blocking the near-infrared and infrared wavelengths.

Experimental Example 2. Thermal cutoff experiment

Using an insulating box equipped with a glass plate, a comparative experiment was conducted with a box equipped with a bare glass by attaching a film in the above example. For the insulation box, two acrylic plate boxes with an outer dimension of 30 cm wide by 30 cm long and 30 cm high were prepared, and a digital temperature sensor was installed in the center of the box. At this time, the digital temperature center secured a calibration certificate from the national measurement standard organization according to the calibration guidelines (NANO-I-0503) of temperature indication, recording, and control devices and tested.

In addition, 5 sides of the acrylic box were treated with a 1 cm thick thermal insulation material, and on one side of the acrylic box, it was constructed so that it could be installed while replacing the glass plate. A halogen lamp (Ningbo Cetus Electric Appliance model name HPH-C205) emitting infrared rays was used as the heat source. At this time, a glass plate was placed at a distance of 30 cm from the center of the halogen lamp, and film treatment was applied to one side of the glass plate so that the film attachment side faced the inside of the box.

After that, while turning on the power of the halogen lamp and heating it, the internal temperature change over time was measured through a digital temperature sensor.

The temperature change inside the insulation box was measured when the insulation film of glass, Example 1, Example 2, and Comparative Example 1 (insulation film-popping air cap structure) was attached using the insulation box used in this experiment, and is shown in Table 2. .

30 min
Film 1
Film 2
Glass
Temperature(℃)
30
34
47

Therefore, as shown in Table 2, it can be seen that the temperature rise of the film is slower than that of the glass without any treatment. Accordingly, it can be seen that the heat absorbing property of the film of the present invention is high.

Claims (4)

A substrate portion made of a flat plate;
A pattern portion formed by printing a phase change material in a pattern shape on one surface of the substrate portion; And
Consisting of including a coating portion formed by coating the pattern portion by a non-heating coating method,
The non-heating coating method is a method of curing by applying an ultraviolet curable resin or a dry laminating method using an adhesive. A film having light-shielding property and heat insulation property according to temperature.
The method according to claim 1,
The phase change material is one or more of octadecane (C ₁₈ H ₃₈ ), icosan (C ₂₀ H ₄₂ ) or caprolactone (C ₆ H ₁₀ O ₂ ), which is mixed with an ultraviolet color change pigment and printed in a pattern shape. A film having light-shielding properties and thermal insulation properties, characterized in that.
The method according to claim 1,
The pattern portion is a film having light-shielding property and heat insulation property according to temperature, characterized in that printing by a silk screen printing method or a gravure printing method.
The method according to claim 1,
The pattern shape is a dot type, a grid type, a stripe type, a logo or a pattern pattern, and the thickness of the pattern coating film is printed at a temperature of 10 to 50 μm by adjusting the thickness of the mesh of the silk screen or the depth of the gravure roll. A film with light-shielding and thermal insulation properties.

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