WO2015194888A1

WO2015194888A1 - Infrared reflective film composition, infrared reflective film including same, and manufacturing method therefor

Info

Publication number: WO2015194888A1
Application number: PCT/KR2015/006200
Authority: WO
Inventors: 박서규; 김기성; 전가희
Original assignee: 미래나노텍(주)
Priority date: 2014-06-18
Filing date: 2015-06-18
Publication date: 2015-12-23
Also published as: KR102238632B1; KR20150145348A

Abstract

The present invention relates to an infrared reflective film composition, an infrared reflective film including the same, and a manufacturing method therefor and, more specifically, to an infrared reflective film composition, an infrared reflective film including the same, and a manufacturing method therefor, which can improve transmittance of a wavelength of a visible light area while efficiently blocking a wavelength of a wide scope of an infrared area range, and can simultaneously implement film slimming which could not be achieved by a conventional infrared reflective film.

Description

Infrared Reflective Film Composition, Infrared Reflective Film Comprising the Same and Method for Manufacturing the Same

The present invention relates to an infrared reflecting film composition, an infrared reflecting film including the same, and a method for manufacturing the same, and more particularly, to effectively block a wavelength of a wide range of infrared range, while improving transmittance of a wavelength of a visible range. At the same time, the present invention relates to an infrared reflecting film composition, an infrared reflecting film including the same, and a method of manufacturing the same, which can realize thinning of a film that cannot be achieved by a conventional infrared reflecting film.

In recent years, as interest in the environment and energy increases, the demand for energy-saving industrial products increases, and as one of them, it is effective in reducing the heat load from the heat shielding of shielding members such as glass such as houses, buildings, automobiles, etc. There is a need for glass and films with. In the case of buildings, more than 35% of the building energy loss is the window performance of the building, and if the window performance is degraded, the cooling and heating air-conditioning efficiency of the building may be lowered together. Japanese Patent Laid-Open No. 2002-0004753 discloses a glass that is very suitable for automobile and building glass by improving infrared and ultraviolet absorption.

On the other hand, it is possible to reduce the heat load to the sunlight through the reflection or absorption of infrared rays (or ultraviolet rays), but because the visibility is important in the case of the shielding member such as glass that requires transparency, infrared rays without affecting the transmission of visible light (Or ultraviolet light) reflection is required.

In order to reduce the heat load from the sun, conventionally applied coloring and vacuum coating plastic film to shielding members such as glass of houses, buildings, automobiles and the like.

The colored film can primarily control visible light transmission through absorption, thereby providing a reduction in glare. However, colored films generally do not block near-infrared solar energy, and thus have been problematic in that they are not effective as infrared light reflecting films or solar control films. In addition, the colored film also has a problem that the decolorization is often progressed by exposure to sunlight, shorten the use cycle and there is a problem of a cost increase due to frequent replacement. Furthermore, when the colored film is colored with a plurality of dyes, the degree of discoloration due to sunlight varies according to the type of dye, and thus, the shielding substrate such as glass, which is attached to the film, has a problem of deteriorating aesthetic appearance due to staining or bluishness.

On the other hand, another window film conventionally used to reduce heat load from sunlight is vacuum-deposited gray metal such as stainless steel, inconel, monel, chromium or nichrome alloy. It was a used film. The deposited gray metal film provides approximately the same degree of transmission in the visible and infrared portions of the solar spectrum. The gray metal film is relatively stable when exposed to light, oxygen, and / or moisture, and the color change is generally not detected when the transmittance of the coating increases due to oxidation. Solved. However, if the transmittance of visible light and infrared portion is similar, it is difficult to achieve the desired heat load reduction effect. If the infrared transmittance is reduced to reduce the heat load caused by infrared rays, the transmittance of visible light is lowered, and the visibility is significantly lowered. There was a problem of generating a secondary consumption of energy by darkening the inside of the light to use the light.

To date, many kinds of films reflecting infrared rays have been mass-produced to reduce the heat load on the sun, but development of films that can achieve the desired level of infrared reflection and visible light transmission has been delayed. Even the infrared reflecting film achieved may reflect only a portion of the infrared wavelength range, that is, the infrared ray in the 780 to 1400 nm wavelength range (IR-A), or may reflect only the infrared ray in the 1400 to 3000 nm wavelength range (IR-B). There is a problem that can cover all the infrared rays in a wide wavelength range, such as to reflect them. The cause of this problem is that the infrared reflecting film that is currently being developed uses a liquid crystal as a configuration capable of reflecting infrared rays, the liquid crystal has a specific pitch as the wavelength range that can be reflected according to the pitch is different This is because only a specific wavelength region can be reflected.

In order to solve this problem, liquid crystals having different pitches may be included to reflect infrared wavelengths in various areas, so that only one liquid crystal having one pitch may be included in one independent region (ex. One layer). Infrared reflecting film could only be implemented in a multi-layer. Specifically, FIG. 1 is a cross-sectional view of a conventional infrared reflecting film, and includes a first infrared reflecting layer 2 and a second infrared reflecting layer 3 formed on a supporting substrate 1, and includes a first infrared reflecting layer 2 and a first infrared reflecting layer 2. 2 The reflective layer of any one of the infrared reflecting layers 3 reflects the infrared rays P in the IR-A wavelength range, and the other reflecting layer reflects the infrared rays Q in the IR-B wavelength range. And infrared rays in the IR-B wavelength range. However, the multilayer structure as described above is very undesirable as a structure that counters the trend of thinning of the film, which can improve the added value and simplify the unit cost of the product and the manufacturing process.

Accordingly, there is an urgent need to develop an infrared reflecting film that can significantly reflect a wide range of infrared wavelength ranges without implementing a multilayer film, and does not reduce the transmittance of visible light, and to realize a thin film.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to reflect infrared rays in several wavelength ranges in one layer and at the same time, the reflection efficiency is remarkable, and the visible light transmittance is not reduced. It is to provide an infrared reflecting film composition, an infrared reflecting film comprising the same, and a method for manufacturing the same, which may contribute to shortening of time, reduction of manufacturing cost, and thinning of a film.

As used herein, the term "phase", which represents a structural positional relationship, is not only formed in direct contact with an upper portion of an object (for example, a support base material), but also indirectly after one or more other layers are inserted into a layer. In this case, all of the layers are formed, and for example, "B layer formed on A", A and B layers directly contact each other, or after forming a third C layer on A, B is formed on the C layer. It includes all cases where a layer is formed.

The term "stacking" of the liquid crystal capsule used in the present invention refers to a structural relationship in which another liquid crystal capsule is stacked on the liquid crystal capsule, and means that the liquid crystal capsule can be stacked in several layers vertically and vertically in one infrared reflective layer.

The infrared reflecting film including the infrared reflecting film composition of the present invention can reflect infrared rays in various wavelength ranges in one independent area and at the same time, the reflection efficiency is also remarkable, so that it does not have to be composed of multiple layers, simplifying and manufacturing the film manufacturing process. It is possible to shorten the time, reduce the manufacturing cost, and to make the film thinner, which is very helpful for improving the added value. In addition, the infrared reflecting efficiency is high and the visible light transmittance is not lowered, which prevents the interior from being dark during the day, and thus, the visibility is excellent, and the energy saving can be further achieved by reducing the use of indoor lighting. It can be widely used.

1 is a cross-sectional view of a conventional infrared reflecting film.

2 is a graph showing the radiation intensity for each wavelength of solar radiation on the earth's surface.

Figure 3 is a schematic diagram showing the pitch in a conventional cholesteric liquid crystal.

Figure 4 is a schematic cross-sectional view of the liquid crystal capsule contained in the infrared reflecting film according to an embodiment of the present invention.

5 is a graph showing the transmittance of each wavelength of the infrared reflecting film according to an embodiment of the present invention.

6 is a TEM photograph of an infrared reflecting layer prepared according to a preferred embodiment of the present invention.

7 is a TEM photograph of an infrared reflecting layer manufactured according to a preferred embodiment of the present invention.

8 is a graph showing the transmittance of the infrared wavelength region according to an embodiment of the present invention.

9 is a schematic cross-sectional view of a composite liquid crystal capsule according to a preferred embodiment of the present invention.

10 is a cross-sectional view of an infrared reflecting film according to a preferred embodiment of the present invention.

11 is a cross-sectional view of an infrared reflecting film according to a preferred embodiment of the present invention.

12 is a cross-sectional view of an infrared reflecting film according to a preferred embodiment of the present invention.

Figure 13 is a graph showing the blocking rate for each wavelength of the infrared reflecting film according to a preferred embodiment and one comparative example of the present invention.

14 is a partial schematic view of a method for manufacturing an infrared reflecting film according to a preferred embodiment of the present invention.

Hereinafter, the present invention will be described in more detail.

As described above, the conventional infrared reflecting film has a short use cycle due to the discoloration of the dye used in the colored film, aesthetics of the appearance due to the discoloration is remarkably lowered, and it is difficult to reflect the infrared ray to the desired level. . In addition, the conventional evaporated gray metal film solves the problem of coloring of the film according to use, but increasing the amount of infrared reflectance also lowers the transmittance of visible light. Thus, when achieving the desired infrared reflecting effect, the visible light transmittance is considerably lowered. To make it very dark and reduce visibility, there is a problem that the energy saving effect due to the heating and cooling is reduced due to the increased energy use due to the use of indoor lighting. Further, the conventional infrared reflecting film can reflect only a portion of the infrared wavelength range, that is, the infrared ray in the 780 to 1400 nm wavelength range (IR-A), or only the infrared ray in the wavelength range of 1400 to 3000 nm (IR-B) In many cases, it is impossible to reflect and cover all infrared rays in a wide wavelength range, and to solve this problem, if the film includes a configuration that reflects light in each wavelength range, The reflecting configuration can only reflect a specific wavelength range targeted, and can not be configured to reflect other wavelength ranges at the same time, so there is a problem that only a single infrared film can be realized. In addition, such a multilayer structure is a structure in which the unit cost of the product, the manufacturing process can not be simplified, and the manufacturing time can be shortened, and the film is thinner. Wu was undesirable problems.

Thus, in the first embodiment of the present invention; A first liquid crystal capsule reflecting light in a wavelength range of 800 to 1400 nm; A second liquid crystal capsule reflecting light in a wavelength range of 1400 to 1900 nm; And a third liquid crystal capsule for reflecting light in a wavelength range of 1900 to 2500 nm. Through this, it is possible to reflect infrared rays in several wavelength ranges in one independent area and at the same time, the reflection efficiency is also remarkable, so that it does not need to be composed of multiple layers, thereby simplifying the film manufacturing process, shortening the manufacturing time, and reducing the manufacturing cost. It enables the thinning of the film, which is very helpful for improving the added value. In addition, the infrared reflecting efficiency is high and the visible light transmittance is not lowered, which prevents the interior from being dark during the day, and thus, the visibility is excellent, and the energy saving can be further achieved by reducing the use of indoor lighting. Can be widely used

First, the infrared reflecting film composition according to the first embodiment of the present invention will be described.

Infrared reflective film according to a first embodiment of the present invention is an adhesive component; A first liquid crystal capsule reflecting light in a wavelength range of 800 to 1400 nm; A second liquid crystal capsule reflecting light in a wavelength range of 1400 to 1900 nm; And a third liquid crystal capsule reflecting light in a wavelength range of 1900 to 2500 nm.

In general, in the case of an infrared film that is currently developed, a cholesteric liquid crystal is used to induce reflection of a desired infrared ray, and the wavelength of a specific infrared region corresponding to the pitch of the cholesteric liquid crystal can be selectively reflected. However, since the cholesteric liquid crystal having a specific pitch can reflect only a wavelength of a specific region, in order to simultaneously reflect light of a wide range of wavelengths, different kinds of cholesters having different pitches corresponding to the wavelength ranges Requires steric liquid crystal. However, cholesteric liquid crystals consist of liquid crystal layers composed of liquid crystal molecules oriented in the same direction, and liquid crystal molecules of another liquid crystal molecule layer and other layers adjacent to each other are oriented in different directions, so that the liquid crystal molecules are consequently spiral, that is, The torsional arrangement is shown, and this arrangement can only be specified in one independent region, and it is difficult for cholesteric liquid crystals having different twisting directions and / or pitch intervals in one independent region to coexist. Due to the characteristics of these liquid crystals, the conventional infrared reflecting film has to include liquid crystals having one kind of pitch and torsional direction in one independent region, that is, in order to reflect multiple wavelength ranges simultaneously. It includes several kinds of liquid crystals having a specific pitch that can reflect the wavelength range, but it is possible to implement only a multilayer film by forming a layer for each liquid crystal type. Such a multilayer film increases the number of processes and prolongs the manufacturing time. Increasing manufacturing costs and increasing film thickness were inevitable.

Accordingly, the inventor of the present invention solves the problems described above, and includes various types of liquid crystals having a specific pitch and a specific twist direction in one independent region to simultaneously include several kinds of infrared rays capable of reflecting light in various wavelength ranges. While continuing the research on the reflective film, the liquid crystal is partitioned into an independent space called a capsule by encapsulating liquid crystals having individual independent spaces included in one independent area, that is, liquid crystals having various kinds of specific pitches and specific torsion directions, in a capsule type. After including the capsules in a reflective layer, which is an independent space, the infrared reflective film to be achieved by the present invention could be realized.

The infrared reflecting film composition according to the present invention includes a first liquid crystal capsule, a second liquid crystal capsule and a third liquid crystal capsule, wherein the first to third liquid crystal capsules each include a liquid crystal having a different pitch for each pitch, The liquid crystal having different pitches may reflect infrared rays in a wide wavelength range for each wavelength range corresponding to each pitch. Specifically, the first liquid crystal capsule reflects light in a wavelength region of 800 to 1400 nm, the second liquid crystal capsule reflects light in a wavelength region of 1400 to 1900 nm, and the third liquid crystal capsule reflects light in a wavelength region of 1900 to 2500 nm. In accordance with the infrared film including the infrared reflecting film composition according to the present invention can effectively reflect the infrared light of a broad wavelength range of 800 ~ 2500nm through a single independent area of the reflective layer at the same time.

The division of the wavelength range covered by each of the first to third liquid crystal capsules included in the infrared reflecting film composition according to the present invention depends on the wavelength-specific radiation intensity of sunlight reaching the ground surface. In detail, FIG. 2 is a graph showing the radiation intensity for each wavelength of solar radiation on the earth's surface. Looking at the wavelength region corresponding to the infrared rays in FIG. 2, that is, 780 nm or more, it can be seen that the radiation intensity is not the same for each wavelength. In other words, there is an infrared wavelength range with a strong radiation intensity, there is a relatively weaker wavelength range, and the radiation intensity increases and decreases according to the wavelength, so that a specific wavelength portion shows near zero radiation intensity to effectively block infrared rays. The inventor of the present invention was able to realize an improved infrared reflection effect by dividing the wavelength range that each liquid crystal capsule should cover in the infrared region into 800 ~ 1400nm, 1400 ~ 1900nm and 1900 ~ 2500nm.

First, the first liquid crystal capsule will be described.

The first liquid crystal capsule is a liquid crystal capsule for reflecting the wavelength range of 800 ~ 1400nm, if the first liquid crystal capsule reflects the wavelength less than 800 nm visible light corresponding to the visible light wavelength reflected by the color of the infrared reflective film As the color of the line becomes colored, a transparent infrared reflecting film may not be realized and there is a problem that the transmittance of visible light may be reduced. Accordingly, when reflecting to the infrared rays corresponding to the wavelength range of 780 to 800 nm, which corresponds to the actual infrared rays, the reflection of visible rays adjacent thereto may be increased, and in this case, even if the light is irradiated as the infrared film may be reddish. There is a problem that can not implement a transparent infrared film.

The first liquid crystal capsule may include a liquid crystal having a pitch capable of selectively reflecting a wavelength range of 800 to 1400 nm, and the liquid crystal may be a liquid crystal having a cholesteric phase.

The liquid crystal having the cholesteric phase is formed by including a chiral dopant capable of forming a liquid crystal of the cholesteric phase in the nematic liquid crystal and / or an optically active liquid crystal such as cholesterol and cholesteryl derivatives. It may include those formed by.

The nematic liquid crystal material used in the liquid crystal having a cholesteric phase formed by including a chiral dopant in the nematic liquid crystal is cyanobiphenyl-based, phenyl cyclohexane-based, phenylbenzoate-based, cyclohexyl benzoate-based, or azomethine. Known nematic liquid crystal materials, such as azobenzene, pyrimidine, dioxane, cyclohexyl cyclohexane, stilbene, and trans, may be used alone or in combination of two or more, and specific examples of such nematic liquid crystal materials Kind can be used without limitation in the case of the nematic liquid crystal material used in the conventional infrared reflecting film.

What is formed by optically active liquid crystals such as cholesterol and cholesteryl derivatives such as cholesterol, cholesteryl octanoate, cholesteryl nonanoate, cholesteryl oleylcarbonate and cholesteryl isostearyl carbonate And the like.

In addition, the chiral dopant may be used alone or in combination of two or more kinds of compounds having optically active groups such as cholesterol derivatives, 2-methyl butyl group, and the like. Can be used without limitation. As a non-limiting example of such a chiral dopant, a chiral dopant represented by the following Chemical Formulas 1 to 9 may be used, or cholesteryl nonanoate (CN), R-811, S-811, S-1011. It is also possible to use a number of commercially available chiral dopants such as S-2011 (Merck KGaA, Germany) and CB15 (BDH, UK).

[Formula 1]

[Formula 2]

[Formula 3]

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

[Formula 8]

[Formula 9]

The chiral dopant may vary in the twisting direction of the liquid crystal on the cholesteric according to the type. When the twisting direction of the liquid crystal includes a preferential chiral dopant that causes the right twist, the reflection of the right circularly polarized light is increased, and the left twist is performed. The inclusion of a left-handed chiral dopant may increase the reflection of the left circularly polarized light.

However, the first liquid crystal capsule should have a pitch for reflecting the wavelength range of 800 ~ 1400nm bar, the combination of the nematic liquid crystal and chiral dopant may be determined to have a pitch that can reflect the wavelength range. Preferably, the chiral dopant is capable of changing the cholesteric liquid crystal pitch due to factors such as temperature, and thus has a heat resistance-that of the nematic liquid crystal and the chiral dopant that do not cause a change in pitch at 20 to 100 ° C. Combinations are preferred.

Looking at the pitch in more detail, when the chiral dopant (chiral dopant) is included in the liquid crystal molecules, a cholesteric liquid crystal having a spirally twisted cholesteric phase is formed. Figure 3 is a schematic diagram showing the pitch in a conventional cholesteric liquid crystal, the cholesteric liquid crystal repeats the twisting of the molecules at regular intervals, the pitch repeating unit length when the twist is completed at 360 ° (pitch, p ) And has the property of selectively reflecting incident light by a repeating structure. The reflection wavelength range is determined by the pitch p. The wavelength at which reflection is maximized, λ, is determined as λ = n × p when the average refractive index of the cholesteric liquid crystal is n. The average refractive index n may vary depending on the liquid crystal, and the pitch p may be adjusted according to the type and content of the chiral dopant. Accordingly, the type and content of the liquid crystal molecule and the chiral dopant, which may form a pitch capable of reflecting a target wavelength range of 800 to 1400 nm, are not particularly limited. However, it is preferable that the chiral dopant is contained in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the liquid crystal molecule, and if the content of the chiral dopant is less than 0.1 part by weight, it may be difficult to realize a desired pitch value. If it exceeds the weight part, the pitch change of the desired cholesteric liquid crystal may no longer occur, but rather, the transmittance of visible light may be reduced due to the excess residual dopant.

Looking at the first liquid crystal capsule in more detail, Figure 4 is a cross-sectional schematic diagram of the liquid crystal capsule contained in the infrared reflecting film composition according to an embodiment of the present invention, the first liquid crystal capsule 31 is the core portion 31a ) And a shell portion 31b surrounding the core portion 31a, wherein the core portion 31a includes a cholesteric liquid crystal containing a nematic liquid crystal and a chiral dopant. 31b may include a water-soluble or fat-soluble polymer.

Detailed description of the chiral dopant will be omitted as described above, the cell portion 31b may include a water-soluble or fat-soluble polymer, the water-soluble or fat-soluble polymer is water-soluble or used in a conventional liquid crystal capsule It may include a fat-soluble polymer, the water-soluble polymer is gelatin, melamine, polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone, it is preferable to use a mixture of two or more kinds of cellulose polymers and the like. In addition, the fat-soluble polymer is preferably used alone or in combination of two or more polybutadiene, polyurethane, polyurea, gum arabic.

The shell portion may further include a polyol, which helps to improve the visibility of the infrared reflecting film. As a non-limiting example of the polyol, a polyester polyol or a polyether polyol may be used alone or in combination of two or more thereof. Can be used. The polyester polyol is, for example, dibasic acid (for example, terephthalic acid, isophthalic acid, adipic acid, azelaic acid, sebacic acid, etc.) or dialkyl esters thereof, or mixtures thereof and glycols (ethylene glycol, propylene). Glycol, diethylene glycol, butylene glycol, neopentyl glycol, 1,6-hexane glycol, 3-methyl-1,5-pentanediol, 3,3'-dimethylol heptane, polyoxyethylene glycol, polyoxypropylene glycol , Polytetramethylene ether glycol, or the like) or a mixture thereof. Moreover, the polyester polyol obtained by ring-opening-polymerizing lactone type (polycaprolactone, poly valerolactone, poly ((beta) -methyl- (gamma) -valerolactone), etc.) as a polyester polyol may be sufficient. Examples of the polyether polyols include polyethylene glycol, polyoxyethylene glycol, polyoxypropylene glycol, polytetramethylene glycol, copolymers thereof, and the like. If the polyol is included in the shell portion may be included 1 to 15% by weight based on the total composition forming the cell portion. When the content is satisfied, staining does not occur in the shell portion of the liquid crystal capsule, and afterimage prevention may help to improve the visibility of the infrared reflecting film.

The average diameter of the first liquid crystal capsule may be preferably 1 to 30㎛, more preferably 1 to 10㎛. If the average diameter of the liquid crystal capsule is less than 1㎛, the infrared reflection efficiency of the wavelength range of the target 800 ~ 1400nm may decrease, and if the average diameter exceeds 30㎛, the improvement of the infrared reflection efficiency of the wavelength range is improved It can be insignificant. The shape of the first liquid crystal capsule is not particularly limited, and the shape may vary depending on the manufacturing method, but may preferably be spherical, thereby improving dispersibility in the infrared reflective film and stacking of liquid crystal capsules in a unit volume. It may be advantageous to the arrangement of such.

In addition, according to a preferred embodiment of the present invention, the average diameter of the first liquid crystal capsule may be 10 to 30 times the average cross-sectional thickness of the shell portion. If the average diameter of the liquid crystal capsule is less than 10 times the average cross-sectional thickness of the shell portion, as the content of the core portion included in the liquid crystal capsule decreases, the infrared reflection efficiency in the 800 to 1400 nm wavelength range even if the same amount of the first liquid crystal capsule is included in the infrared film. This may be reduced, and since the shell portion is relatively thick compared to the diameter of the liquid crystal capsule, a problem may occur such that the transmittance of visible light may decrease due to an increase in the amount of visible light reflected by the liquid crystal capsule. In addition, if the average diameter of the liquid crystal capsule exceeds 30 times the average cross-sectional thickness of the shell portion, the thickness of the shell portion may become relatively thin, such that the liquid crystal capsule may be broken by the physical force.

Meanwhile, the chiral dopant which may be included in the first liquid crystal capsule included in the infrared reflecting film composition of the first embodiment according to the present invention may include a left dopant or a preferential dopant. The first liquid crystal capsule containing the left dopant is suitable for the reflection of the left circularly polarized infrared light in the wavelength region of 800 to 1400 nm, and the first liquid crystal capsule containing the preferential dopant may be more suitable for the right circular polarization infrared reflection of the wavelength region. have.

According to an exemplary embodiment of the present invention, the first liquid crystal capsule may include both a left first liquid crystal capsule containing a left linear dopant and a first liquid crystal capsule containing a preferential dopant. Compared with the case in which the first linear liquid crystal capsule or the first liquid crystal capsule is included only, the infrared reflection effect of the 800 ~ 1400 nm wavelength region can be significantly improved. In this case, one first liquid crystal capsule may include only one type, that is, the left linearity or the preferential dopant. More preferably, the infrared reflecting film composition may include the first left liquid crystal capsule and the first liquid crystal capsule in a weight ratio of 1: 0.8 to 1.2, and more preferably the first left liquid crystal capsule and the first agent. 1 liquid crystal capsules may be included in a weight ratio of 1: 0.9 to 1.1. If the preferred first liquid crystal capsule is included in less than 0.8 weight ratio, the infrared reflection in the right circularly polarized 800 ~ 1400nm wavelength range may be reduced, and if included in more than 1.2 weight ratio, the infrared reflection in the right polarized 800 ~ 1400nm wavelength region Since the infrared reflectance of the wavelength region, which is relatively circularly polarized, is reduced, it may be difficult to achieve the desired physical properties such as the infra-red reflection efficiency cannot be achieved.

Specifically, Figure 5 is a graph showing the blocking rate for each wavelength of the infrared reflecting film according to an embodiment of the present invention, Example 8 that does not include the preferential liquid crystal capsule as shown in the graph is left and right liquid crystal capsule It can be seen that the blocking rate of the infrared region is significantly reduced compared to Example 1 including all.

Next, a description will be given of the second liquid crystal capsule contained in the infrared reflecting film composition of the first embodiment according to the present invention.

The second liquid crystal capsule is a liquid crystal capsule for selectively reflecting the wavelength range of 1400 ~ 1900nm. The second liquid crystal capsule may include a liquid crystal having a pitch capable of selectively reflecting the wavelength range, and the liquid crystal may be a liquid crystal having a cholesteric phase.

The second liquid crystal capsule is a core portion including a cholesteric liquid crystal containing a chiral dopant in the nematic liquid crystal; And a shell portion including a water-soluble or fat-soluble polymer, wherein the chiral dopant may include a lecithin dopant or a preferential dopant. In addition, preferably, the second liquid crystal capsule may include both a second liquid crystal capsule containing a left dopant and a second liquid crystal capsule containing a preferential dopant, and thus, may include a second liquid crystal capsule or Compared to the case of including only the first second liquid crystal capsule, it is possible to achieve an infrared reflection effect of 1400 to 1900 nm which is significantly improved. In this case, one second liquid crystal capsule may include only one type, that is, the left linearity or the preferential dopant. More preferably, the infrared reflecting film composition may include the first left liquid crystal capsule and the first liquid crystal capsule in a weight ratio of 1: 0.8 to 1.2, and more preferably the second left liquid crystal capsule and the first agent. 2 liquid crystal capsules may be included in a weight ratio of 1: 0.9 to 1.1. If the preferential second liquid crystal capsule is included in less than 0.8 weight ratio, the infrared reflection in the right polarized 1400 ~ 1900nm wavelength range may be reduced, and if included in more than 1.2 weight ratio, infrared reflection in the right polarized 1400 ~ 1900nm wavelength range Since the infrared reflectance of the wavelength region, which is relatively circularly polarized, is reduced, it may be difficult to achieve the desired physical properties such as the infra-red reflection efficiency cannot be achieved.

According to a preferred embodiment of the present invention, the average diameter of the second liquid crystal capsule may be 1 ~ 30㎛. In addition, the average diameter of the second liquid crystal capsule may be 10 to 30 times the average cross-sectional thickness of the shell portion.

Specific descriptions such as criticality of the liquid crystal, chiral dopant, material of the shell portion, average diameter, and shell cross-sectional thickness included in the second liquid crystal capsule are the same as those of the first liquid crystal capsule described above. .

On the other hand, any one or more of the kind of the liquid crystal and chiral dopant, the content of the chiral dopant and the material of the shell included in the second liquid crystal capsule are the same as or different from the first liquid crystal capsule and / or the third liquid crystal capsule to be described later. can do.

Next, a third liquid crystal capsule contained in the infrared reflecting film composition of the first embodiment according to the present invention will be described.

The third liquid crystal capsule is a liquid crystal capsule for selectively reflecting the wavelength range of 1900 ~ 2500nm. The third liquid crystal capsule may include a liquid crystal having a pitch capable of selectively reflecting the wavelength range, and the liquid crystal may be a liquid crystal having a cholesteric phase.

The third liquid crystal capsule core portion including a cholesteric liquid crystal containing a chiral dopant in the nematic liquid crystal; And a shell portion including a water-soluble or fat-soluble polymer, wherein the chiral dopant may include a lecithin dopant or a preferential dopant. In addition, preferably, the third liquid crystal capsule may include both a left liquid third liquid crystal capsule including a left dopant and a preferential third liquid crystal capsule containing a priority dopant, and thus, a third left liquid crystal capsule or Compared with the case where only the first liquid crystal capsule is included, the infrared reflection effect of 1900 to 2500 nm is significantly improved. In this case, one third liquid crystal capsule may include only one type, that is, the left linearity or the preferential dopant. More preferably, the infrared reflecting film composition may include the left third liquid crystal capsule and the first preferred liquid crystal capsule in a weight ratio of 1: 0.8 to 1.2, and more preferably the third left liquid crystal capsule and the priority agent. 3 liquid crystal capsules may be included in a weight ratio of 1: 0.9 to 1.1. If the preferred third liquid crystal capsule is included in less than 0.8 weight ratio, the infrared reflection in the right polarized 1900 ~ 2500nm wavelength region may be reduced, and if included in more than 1.2 weight ratio, infrared reflection in the right polarized 1900 ~ 2500nm wavelength region Since the infrared reflectance of the wavelength region, which is relatively circularly polarized, is reduced, it may be difficult to achieve the desired physical properties such as the infra-red reflection efficiency cannot be achieved.

According to a preferred embodiment of the present invention, the average diameter of the third liquid crystal capsule may be 1 ~ 30㎛. In addition, the average diameter of the third liquid crystal capsule may be 10 to 30 times the average cross-sectional thickness of the shell portion.

Specific descriptions such as criticality of the liquid crystal, chiral dopant, material of the shell portion, average diameter, and shell cross-sectional thickness included in the third liquid crystal capsule are the same as those of the first liquid crystal capsule described above, and will be omitted below. .

On the other hand, any one or more of the kind of the liquid crystal and chiral dopant, the content of the chiral dopant and the material of the shell included in the third liquid crystal capsule may be the same as or different from the first liquid crystal capsule and / or the second liquid crystal capsule. have.

Next, the infrared reflecting film composition of the first embodiment according to the present invention includes an adhesive component.

The adhesive component has no problem in compatibility with the aforementioned first to third liquid crystal capsules, and may be used without limitation in the case of the adhesive component capable of forming a film at the same time. The adhesive component may include any one or more of thermosetting, photocurable, and room temperature curable resins according to curing type. The thermosetting, photocurable, room temperature curable resin or hybrid curable resin may be a thermosetting, photocurable, room temperature curable or hybrid curable resin known in the art. The thermosetting adhesive component is a component which hardening can occur through the application of appropriate heat or an aging process, and the photocurable adhesive component is a component which hardening can occur by irradiation of light (active energy ray), and room temperature hardenability is When a predetermined time passes at room temperature, the curing may be a component, and the hybrid curable adhesive component may refer to a component that the curing mechanism of the thermosetting and photocurable adhesive components proceeds simultaneously or sequentially. In addition, the light irradiated to the photocurable adhesive component may be microwaves, infrared rays (IR), ultraviolet rays (UV), X-rays and gamma rays, alpha-particle beams, proton beams, Particle beams such as neutron beams and electron beams.

As the curable adhesive component, for example, as a component that can be cured and exhibit adhesiveness, a functional group or a site capable of curing by heat such as a glycidyl group, an isocyanate group, a hydroxyl group, a carboxyl group or an amide group, a silane group, or the like is used. One or more functional groups or sites containing at least one or curable by irradiation with light such as an epoxide group, a cyclic ether group, a sulfide group, an acetal group or a lactone group A component containing at least one can be used. The curable adhesive component may be exemplified by an acrylic component, an isocyanate component, a silicone component or an epoxy component having at least one or more of the above-described functional groups or sites, but is not limited thereto.

As a non-limiting example of the component, first, in the case of the acrylic component, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal-butyl methacrylate, normal-butyl methyl methacrylate, acrylic acid, meta Krylic acid, itaconic acid, hydroxymethyl methacrylate, hydroxypropyl methacrylate, acrylamide, methylol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2- Ethyl hexyl acrylate polymer, polyester acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, silicone acrylate and the like may be included alone or in combination of two or more.

The silicone-based component may be a resin including a silicon-bonded hydrogen atom, a hydroxy group, or a hydrolyzable group, and may be a conventional silicone resin known in the art prepared by a known technique. Such silicone resins can typically be prepared by cohydrolysing a suitable mixture of silane precursors in an organic solvent such as toluene, for example, the silicone resin is a silane of formula R ¹ R ² ₂ SiX and a formula R ² SiX ₃ Silane wherein R ¹ is C ₁ to C ₁₀ hydrocarbyl or C ₁ to C ₁₀ halogen-substituted hydrocarbyl, R ² is R ¹ , —H or a hydrolyzable group, and X may be a hydrolyzable group The hydrolyzable group may be prepared in minutes, for example, within 30 minutes at room temperature (−23 ± 2 ° C.) to 100 ° C., in the hydrolyzable group. Means that it can react with water in the presence or absence of a catalyst in it to form silanol (Si-OH) groups Examples of hydrolyzable groups represented by R ² are -Cl, -Br, -OR ₃ , -OCH ₂ CH ₂ OR ₃ , CH ₃ C (= O) O-, Et (Me) C = NO-, CH ₃ C (= O) N (CH ₃ )-And -ONH ₂ , wherein R ³ is C ₁ to C ₈ hydrocarbyl or C ₁ to C ₈ halogen-substituted hydrocarbyl.

The epoxy component is a glycidyl ether type epoxy component, glycidyl amine type epoxy component, glycidyl ester type epoxy component, linear aliphatic epoxy component, cyclo aliphatic epoxy component, heterocyclic containing It includes an epoxy component, a substituted epoxy component, a naphthalene-based epoxy component and derivatives thereof, and may be a bifunctional or polyfunctional component, and these may be used alone or in combination.

More specifically, the glycidyl ether type epoxy component includes glycidyl ethers of phenols and glycidyl ethers of alcohols. As glycidyl ethers of the phenols, bisphenol A type, bisphenol B type, bisphenol AD type, Bisphenol epoxy such as bisphenol S type, bisphenol F and resorcinol, phenol novolac epoxy, aralkylphenol novolac, phenolic novolac and terpene phenol novolac and o-cresol novolac (Cresolnovolac Cresol novolac epoxy components such as epoxy), and these may be used alone or in combination of two or more thereof. Preferably, the first epoxy component may be a bisphenol epoxy component, and more preferably a bisphenol F-type epoxy. Component, in which case it is possible to obtain better physical properties, such as bump bonding reliability, than in the case of including other kinds of epoxy components. There is an advantage to this.

As the glycidyl amine type epoxy component, diglycidyl aniline, tetraglycidyl diaminodiphenylmethane, N, N, N ', N'-tetraglycidyl-m-xylylenediamine, 1,3 -Bis (diglycidylaminomethyl) cyclohexane, triglycidyl-m-aminophenol and triglycidyl-p-aminophenol having both structures of glycidyl ether and glycidyl amine, and the like or alone 2 or more types can be used together.

The glycidyl ester type epoxy component may be an epoxy component such as hydroxycarboxylic acid such as p-hydroxybenzoic acid or β-hydroxy naphthoic acid and polycarboxylic acid such as phthalic acid or terephthalic acid, and may be used alone or in combination of two or more thereof. can do. As the linear aliphatic epoxy component, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexanedimethanol, glycerin, trimethylolethane, thirimethylolpropane, pentaerythritol, dodecahydro bisphenol A And glycidyl ethers based on dodecahydro bisphenol F, ethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, and the like, and may be used alone or in combination of two or more thereof.

Examples of the alicyclic epoxy component include 3,4-epoxycyclohexylmethyl-3 ', 4'-epoxycyclohexanecarboxylate.

Naphthalene-based epoxy components include 1,2-diglycidyl naphthalene, 1,5-diglycidylnaphthalene, 1,6-diglycidylnaphthalene, 1,7-diglycidylnaphthalene, 2,7-di It may be an epoxy component having a naphthalene skeleton such as glycidyl naphthalene, triglycidyl naphthalene, 1,2,5,6-tetraglycidyl naphthalene, and may be used alone or in combination of two or more thereof. In addition, the naphthalene-based epoxy component may include a compound represented by the following formula (1) to (3).

In addition to those enumerated above, triglycidyl isocyanurate and an epoxy component having an epoxycyclohexane ring in a molecule obtained by oxidizing a compound having a plurality of double bonds in the molecule may be used. Such an epoxy component may vary in kind and blending ratio included according to the purpose, and is not particularly limited in the present invention.

On the other hand, the infrared reflecting film composition of the first embodiment according to the present invention may include a total liquid crystal capsule including the first liquid crystal capsule to the third liquid crystal capsule 400 to 900 parts by weight based on 100 parts by weight of the adhesive component described above. If the first liquid crystal capsule to the third liquid crystal capsule is less than 400 parts by weight, the density of the liquid crystal capsule in the infrared reflecting layer may be reduced, so that there may be a place that does not include the liquid crystal capsule infrared reflection of the target wavelength range of 800 ~ 2500nm It may not be able to implement the desired physical properties, such as efficiency is reduced, and if included in excess of 900 parts by weight may cause a problem of durability degradation such as peeling off the infrared reflecting layer during use resulting in a weakening of the adhesion.

Specifically, FIG. 6 is a TEM image of an infrared reflecting layer manufactured according to a preferred embodiment of the present invention, and includes 300 parts by weight of the entire liquid crystal capsule including the first liquid crystal capsule to the third liquid crystal capsule with respect to 100 parts by weight of the adhesive component. (See Example 17) As the density of the liquid crystal capsule in the infrared reflecting layer is lowered, it can be seen that there are regions where the liquid crystal capsule is not included in the reflecting layer. On the contrary, FIG. 7 is a TEM image of an infrared reflecting layer manufactured according to a preferred embodiment of the present invention, and includes 880 parts by weight of the entire liquid crystal capsule including the first liquid crystal capsule to the third liquid crystal capsule with respect to 100 parts by weight of the adhesive component. In the case of (see Example 1), as the density of the liquid crystal capsule in the infrared reflecting layer is high, it can be seen that there is almost no region in which the liquid crystal capsule is not included in the reflecting layer.

The density of the liquid crystal capsule in the reflective layer may affect the infrared transmittance of the 800 ~ 2500nm wavelength range. Specifically, Figure 8 is a graph showing the transmittance of the infrared wavelength region according to a preferred embodiment of the present invention, as can be seen in the graph, Example 1 having a higher liquid crystal capsule density of the infrared reflecting layer in the infrared wavelength region than Example 17 It can be seen that the light transmittance is significantly reduced.

In addition, the infrared reflecting film composition may include 90 to 300 parts by weight of the first liquid crystal capsule and 90 to 200 parts by weight of the second liquid crystal capsule with respect to 100 parts by weight of the third liquid crystal capsule.

Specifically, the infrared intensity of 800 to 1400 nm, which is the wavelength range that the first liquid crystal capsule can reflect, is stronger than the infrared ray of 1400 to 1900 nm, which is the wavelength range that the second liquid crystal capsule can reflect (Fig. 2). As the infrared intensity in the wavelength range that the second liquid crystal capsule can reflect is stronger than the infrared rays of 1900 to 2500 nm that the third liquid crystal capsule can reflect (see FIG. 2), In consideration of the surface reaching radiation intensity, the content of each liquid crystal capsule in the composition according to the present invention may be designed to decrease from the first liquid crystal capsule to the third liquid crystal capsule. If the first liquid crystal capsule is included in less than 90 parts by weight for the third liquid crystal capsule, the infrared reflection in the 800 ~ 1400nm wavelength range may be insufficient, and when the total amount exceeds 300 parts by weight, the total liquid crystal may have an excellent infrared reflection effect. Within the limits of the capsule content, the content of the second liquid crystal capsule and the third liquid crystal capsule can be reduced relative to the content of the first liquid crystal capsule, so that the infrared reflection in the 1400 ~ 1900nm wavelength band and / or the 1900-2500nm wavelength band There is a problem that it may be difficult to implement an infrared reflecting film having the desired physical properties, such as insufficient or the amount of the liquid crystal capsule as compared to the adhesive component as a whole may increase the adhesive strength.

In addition, if the second liquid crystal capsule is contained in less than 90 parts by weight for the third liquid crystal capsule may be insufficient infrared reflection in the wavelength range of 1400 ~ 1900nm, if it exceeds 200 parts by weight may have excellent infrared reflection effect Within the limits of the total liquid crystal capsule content, the content of the first liquid crystal capsule and the third liquid crystal capsule can be reduced relative to the content of the second liquid crystal capsule, so that the infrared rays in the 800 to 1400 nm wavelength range and / or the 1900 to 2500 nm wavelength range are There is a problem that it may be difficult to implement an infrared reflecting film having the desired physical properties, such as insufficient reflection or the content of the liquid crystal capsule as compared to the adhesive component as a whole may increase the adhesive strength.

However, it may be designed in various content ratios in consideration of the radiation intensity (see FIG. 2) for each infrared wavelength region reaching the ground surface.

On the other hand, according to a preferred embodiment of the present invention, in order to implement the desired infrared reflecting film by increasing the probability that the first liquid crystal capsule to the third liquid crystal capsule is evenly dispersed and mixed in the entire region of the infrared reflecting layer of the infrared reflecting film. The first liquid crystal capsule and the second liquid crystal capsule may be included in an amount of 90 to 110 parts by weight based on 100 parts by weight of the third liquid crystal capsule. If one particular liquid crystal capsule is contained significantly less than other liquid crystal capsules (or a certain liquid crystal capsule is significantly higher than other liquid crystal capsules) and mixed with adhesive components, Specific liquid crystal capsules (or other types of liquid crystal capsules having a relatively low content due to a large amount of specific liquid crystal capsules) contained in an amount are included only in a certain part of the whole composition, and in some parts, the specific liquid crystal capsule is not included. As the probability of occurrence increases, the infrared reflecting layer manufactured through such a composition does not uniformly disperse the specific liquid crystal capsules throughout the entire reflecting layer, and certain areas of the reflecting layer do not contain the specific liquid crystal capsules. There is a problem that can be reduced. Accordingly, the first liquid crystal capsule and the second liquid crystal capsule may be included in an amount of 90 to 110 parts by weight based on 100 parts by weight of the third liquid crystal capsule to increase the probability that the first liquid crystal capsule to the third liquid crystal capsule are evenly dispersed in the infrared reflective layer region. have.

Meanwhile, the infrared reflecting film composition of the first embodiment according to the present invention may be any one of a curing agent, a curing accelerator, a photoinitiator, a solvent, and the like, depending on the type or curing type of the adhesive component used in addition to the above-described adhesive components, the first to third liquid crystal capsules. It may further include one or more. In this case, the curing agent may include 0.5 to 20 parts by weight based on 100 parts by weight of the adhesive component, and may further include 1 to 20 parts by weight based on 100 parts by weight of the adhesive component when the curing accelerator is further included. In addition, the photoinitiator may include 0.5 to 20 parts by weight based on 100 parts by weight of the adhesive component, and may include 10 to 200 parts by weight based on 100 parts by weight of the adhesive component. However, the content of the curing agent, curing accelerator, solvent, photoinitiator and the like may be changed depending on the type and ratio of the specific adhesive component, or the crosslinking density to be implemented. Furthermore, additives such as plasticizers, ultraviolet stabilizers and / or antioxidants that are well known in the art may be additionally included in a range that does not affect the desired effect.

The curing agent may be selected and used according to the type of the functional group contained in the above-mentioned curable adhesive component, it may be used a conventional curing agent known in the art. If the curable adhesive component is an epoxy component, as a non-limiting example of a curing agent that can be used therein, aliphatic amines such as diethylenetriamine, triethylenetetramine, metaphenylenediamine, diaminodiphenylmethane, diaminodi Aromatic amines such as phenylsulfone and azomethylphenol, polyhydric hydroxy compounds such as phenol novolak resin, orthocresol novolak resin, naphthol novolak resin and phenol aralkyl resin, and modified substances thereof, phthalic anhydride and maleic anhydride And latent curing agents such as acid anhydride-based curing agents such as hexahydrophthalic anhydride and pyromellitic anhydride, dicyandiamide, imidazole, BF3-amine complexes, and guanidine derivatives, and these may be used alone or in combination of two or more thereof. have.

In addition, the curing accelerator serves to adjust the curing rate or the physical properties of the cured product, and the curing accelerator used in the art can be used without limitation, as a non-limiting example, imidazole-based curing accelerator, tertiary amine A system hardening accelerator etc. are mentioned, Especially, the imidazole series hardening accelerator is used preferably from the point which is easy to control the reaction system for adjusting the hardening rate, the physical property of hardened | cured material, etc. These hardening accelerators can also use individually or in combination of 2 or more types.

In addition, the solvent may be used a solvent generally used in the art, but is not particularly limited, N-methylpyrrolidone, N, N- dimethylacetamide, γ-butyrolactone, hexamethylphosphoamide, Dimethylformamide, methyl ethyl ketone, cyclopentanone, cyclohexanone, ethyl acetate, butyl acetate, dioxane, tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, 2-ethoxy ethanol, methylcellulsolve, And one or more selected from 2-methoxyethyl ether.

The photoinitiator may be used alone or in combination of two or more kinds of alpha hydroxy ketones, alpha amino ketones, phenylglyol acrylates, acryl phosphine oxides, preferably alpha hydroxy in terms of increasing transparency It may include at least one or more of ketone-based and phenyl glyoxylate-based, in the case of the specific kind may be well known in the art, non-limiting example, hydroxydimethylacetophenone (Hydroxy dimethyl acetophenone) and 2,4-diethylthioxanthone may be used alone or in combination of two or more thereof.

As described above, the viscosity of the infrared reflecting film composition of the first embodiment according to the present invention may be 1 to 100 cps, preferably 30 to 100 cps at 25 ° C. If the viscosity is less than 1 cps, it may not be easy to form an infrared reflecting layer through the composition according to the present invention at room temperature, there is a problem that the manufacturing process complicated by the additional heat treatment, the manufacturing time is extended and the manufacturing cost is increased If the viscosity exceeds 100 cps, it is not easy to manufacture a thin infrared reflecting layer when manufacturing an infrared reflecting layer, and even if a thin infrared reflecting layer is manufactured, the liquid crystal capsule is applied in a direction in which pressure is applied. There may be a problem that the arrangement is biased may not be able to obtain even infrared reflection effect in all areas of the manufactured infrared reflecting layer or there may be a problem that the infrared reflectance is significantly reduced. In addition, if the above range is not satisfied, as the liquid crystal capsule is dispersed and mixed with the adhesive component, the dispersibility decreases. As the liquid crystal capsule is concentrated at a specific site, the infrared ray blocking rate may be remarkably reduced, and even infrared rays may be selected in all areas of the reflective layer. The reflection effect may not be realized, and the visible light blocking rate, which is not the object of the present invention, may be significantly increased, and luminance may be uneven.

Next, an infrared reflecting film composition of a second embodiment according to the present invention will be described. The infrared reflecting film composition of the second embodiment according to the present invention will be described below with a focus on differences from the infrared reflecting film composition according to the first embodiment described above.

Infrared reflective film composition of the second embodiment according to the present invention is an adhesive component; And a first liquid crystal capsule reflecting light in a wavelength region of 800 to 1400 nm and a second liquid crystal capsule reflecting light in a wavelength region of 1400 to 1900 nm. And a complex liquid crystal capsule including at least two or more of third liquid crystal capsules reflecting light in a wavelength range of 1900 to 2500 nm.

First, the second embodiment according to the present invention includes a composite liquid crystal capsule capable of reflecting light in the wavelength range of 800 to 2500 nm.

Specifically, Figure 9 is a cross-sectional schematic diagram of a composite liquid crystal capsule according to an embodiment of the present invention, the composite liquid crystal capsule 130 may include a shell portion 130, the first liquid crystal inside the shell portion 130 The capsule 131 includes a second liquid crystal capsule 132 and a third liquid crystal capsule 133.

When implementing a large-area infrared reflecting film having a different pitch that can reflect the light of each wavelength range, and also different kinds of twisting direction liquid crystal capsules, specifically, the first to third liquid crystal capsules; And the left-line liquid crystal capsules and the preferential liquid crystal capsules for each liquid crystal capsule; these are not necessarily biased by type and are evenly distributed to be included in the infrared reflecting film. If different types of liquid crystal capsules are included in a specific area on the infrared reflecting film by type or only some types of liquid crystal capsules exist in a specific area of the infrared reflecting film, the desired infrared reflecting effect cannot be achieved. In some regions of the infrared reflecting film, there may be a problem such that the infrared rays of the specific wavelength range are not reflected and are transmitted as they are. In order to eliminate this problem, a second embodiment of the present invention provides a first liquid crystal capsule reflecting light in a wavelength region of 800 to 1400 nm and a second liquid crystal capsule reflecting light in a wavelength region of 1400 to 1900 nm. And supporting at least two or more liquid crystal capsules among the third liquid crystal capsules reflecting light in the wavelength range of 1900 to 2500 nm in one liquid crystal capsule, irrespective of the distribution of the first to third liquid crystal capsules in the large-area infrared reflective film. Irrespective of the amount of infrared reflectance and the position of the infrared reflecting film can achieve a constant infrared reflecting amount.

The composite liquid crystal capsule included in the second embodiment according to the present invention preferably includes all of the first to third liquid crystal capsules, and more preferably, the left liquid crystal for each of the first to third liquid crystal capsules. By including both the capsule and the preferential liquid crystal capsule, it is possible to implement an infrared reflecting film expressing a remarkably excellent infrared reflecting amount.

The composite liquid crystal capsule may include 90 to 300 parts by weight of the first liquid crystal capsule or 90 to 200 parts by weight of the second liquid crystal capsule with respect to 100 parts by weight of the third liquid crystal capsule. Alternatively, the first liquid crystal capsule may include 90 to 150 parts by weight based on 100 parts by weight of the second liquid crystal capsule. In order to implement more improved physical properties, the first liquid crystal capsule and the second liquid crystal capsule may be included in an amount of 90 to 110 parts by weight, respectively, based on 100 parts by weight of the third liquid crystal capsule. Specifically, the infrared intensity of 800 to 1400 nm, which is the wavelength range that the first liquid crystal capsule can reflect, is stronger than the infrared ray of 1400 to 1900 nm, which is the wavelength range that the second liquid crystal capsule can reflect (Fig. 2). As the infrared intensity in the wavelength range that the second liquid crystal capsule can reflect is stronger than the infrared rays of 1900 to 2500 nm that the third liquid crystal capsule can reflect (see FIG. 2), In consideration of the surface reaching radiation intensity, the content of each liquid crystal capsule in the composition according to the present invention may be designed to decrease from the first liquid crystal capsule to the third liquid crystal capsule. If the first liquid crystal capsule is included in less than 90 parts by weight for the third liquid crystal capsule, the infrared reflection in the 800 ~ 1400nm wavelength range may be insufficient, and when the total amount exceeds 300 parts by weight, the total liquid crystal may have an excellent infrared reflection effect. Within the limits of the content of the capsule, the content of the second liquid crystal capsule and the third liquid crystal capsule can be reduced relative to the content of the first liquid crystal capsule, so that the reflection of infrared rays in the wavelength range of 1400 to 1900 nm and / or 1900 to 2500 nm There is a problem that it may be difficult to implement an infrared reflecting film having the desired physical properties, such as insufficient or the amount of the liquid crystal capsule as compared to the adhesive component as a whole may increase the adhesive strength.

In addition, if the second liquid crystal capsule is included in less than 90 parts by weight for the third liquid crystal capsule may be insufficient infrared reflection in the wavelength range of 1400 ~ 1900nm, if it exceeds 300 parts by weight may have an excellent infrared reflection effect Within the limits of the total liquid crystal capsule content, the content of the first liquid crystal capsule and the third liquid crystal capsule can be reduced relative to the content of the second liquid crystal capsule, so that the infrared rays in the 800 to 1400 nm wavelength range and / or the 1900 to 2500 nm wavelength range are There is a problem that it may be difficult to implement an infrared reflecting film having the desired physical properties, such as insufficient reflection or the content of the liquid crystal capsule as compared to the adhesive component as a whole may increase the adhesive strength.

However, it can be designed in various content ratios in consideration of the radiation intensity for each infrared wavelength band reaching the ground surface.

In addition, it is preferable that each of the first to third liquid crystal capsules included in the composite liquid crystal capsule includes both a left liquid crystal capsule and a preferential liquid crystal capsule, wherein the left liquid crystal capsule and the first liquid crystal capsule are from 1: 0.8 to 1.2 may be included in a weight ratio, and more preferably, the left-line liquid crystal capsule and the preferential liquid crystal capsule may be included in a weight ratio of 1: 0.9 to 1.1. If the preferential liquid crystal capsule is included in less than 0.8 weight ratio, the right circularly polarized infrared reflection may be lowered. Since the amount of reflection is reduced, the desired physical properties may be difficult to achieve, such as the inability to achieve the desired infrared reflection efficiency.

In addition, the average diameter of the composite liquid crystal capsule may be 30 ~ 200㎛. If the average diameter of the composite liquid crystal capsule is less than 30 ㎛ the liquid crystal capsule that can contain all of the liquid crystal capsules having the desired different pitches and at the same time different liquid crystals having different torsion directions independently or less content is less The desired infrared reflecting effect may not be expressed, and if the average diameter exceeds 200 µm, the degree of improvement of the infrared reflecting effect may be insignificant, and there may be a problem in that the infrared reflecting layer cannot be thinned. The description of the first to third liquid crystal capsules is the same as the description of the first to third liquid crystal capsules according to the first embodiment described above will be omitted.

Next, the infrared reflecting film composition according to the second embodiment of the present invention includes an adhesive component.

Detailed description of the adhesive component is the same as the adhesive component according to the first embodiment described above and will be omitted below.

Infrared reflective film composition according to a second embodiment according to the present invention may be included 400 ~ 900 parts by weight of the composite liquid crystal capsule with respect to 100 parts by weight of the adhesive component. If the composite liquid crystal capsule is included in less than 400 parts by weight may not be able to implement the desired properties, such as the infrared reflection efficiency of the wavelength range of 800 ~ 2500nm of the target, if it is contained in excess of 900 parts by weight will result in weak adhesion. Therefore, there may be a problem of deterioration in durability, such as peeling off the infrared reflecting layer during use.

In addition, the viscosity of the infrared reflecting film composition of the second embodiment according to the present invention may be a viscosity of 1 ~ 100 cps, preferably 30 ~ 100 cps at 25 ℃. If the viscosity is less than 1 cps, it may not be easy to form an infrared reflecting layer through the composition according to the present invention at room temperature, there is a problem that the manufacturing process complicated by the additional heat treatment, the manufacturing time is extended and the manufacturing cost is increased If the viscosity exceeds 100 cps, it is not easy to manufacture a thin infrared reflecting layer when manufacturing an infrared reflecting layer, and the composite liquid crystal capsule is applied in the direction of applying pressure even if a thin infrared reflecting layer is manufactured. There may be a problem that is arranged biased to the problem that it is not possible to obtain an even infrared reflecting effect in all areas of the manufactured infrared reflecting layer. In addition, if the above range is not satisfied, as the liquid crystal capsule is dispersed and mixed with the adhesive component, the dispersibility decreases. As the liquid crystal capsule is concentrated at a specific site, the infrared ray blocking rate may be remarkably reduced, and even infrared rays may be selected in all areas of the reflective layer. The reflection effect may not be realized, and the visible light blocking rate, which is not the object of the present invention, may be significantly increased, and luminance may be uneven.

First to third liquid crystal capsules in the first and second infrared reflective film composition according to the present invention described above; Or a composite liquid crystal capsule containing at least two or more liquid crystal capsules of the first to third liquid crystal capsules; will be described in the manufacturing method.

The liquid crystal capsule or a method for producing a composite liquid crystal capsule containing the liquid crystal capsule may be by a liquid crystal capsule manufacturing method known in the art, and is not particularly limited in the present invention. The manufacturing method of the liquid crystal capsule described below is merely one example and is not limited thereto.

According to a preferred embodiment of the present invention, the liquid crystal capsule (1) a step of preparing an emulsion by mixing the shell-forming component, the liquid crystal, the emulsifier and the solvent on the cholesteric phase; And (2) gelling and curing the emulsion.

First, step (1) is a step of preparing an emulsion by mixing a shell forming component, a cholesteric liquid crystal, an emulsifier, and a solvent, and the method of mixing prior to each component will be described.

The mixing order of the composition for preparing the oil agent of step (1) is not particularly limited in the present invention. Some or all of the composition may be added at the same time, or the whole composition may be added sequentially. Preferably, the cholesteric phase liquid crystal, the solvent, and the emulsifier may be mixed to emulsify the liquid crystal first, and then the cell portion forming component may be mixed. When emulsifying the liquid crystal first, it is preferable to emulsify by mixing the emulsifier for 5 to 30 minutes at 60 ~ 70 ℃, such as by ultrasonic, wherein the intensity, frequency of the ultrasonic wave may be by a method known in the art. . Preferably, the cell portion forming component is pre-infused and mixed with only 40 to 60% by weight of the added amount, and then remains after pH 4.0 to 6.0, more preferably pH 4.7 to 5.0 through a pH adjusting agent. The cell portion forming component of may be mixed, and even after the remaining portion of the cell forming component is mixed, the pH may be recalibrated to pH 4.0 to 6.0, more preferably pH 4.7 to 5.0. Correction of the pH value to the above range may directly affect the formation and maintenance of the emulsion, and if the above range is not satisfied, the complex coacervation may become unstable or destroyed to yield the liquid crystal capsule. This is because there may be a problem that may not be good or the liquid crystal capsule itself. Injecting the shell forming component may be accompanied by continuous stirring, the stirring speed is preferably 6000 ~ 9000rpm. If the stirring speed does not satisfy the above range there may be a problem that may occur in the surface of the prepared liquid crystal capsule.

Description of the specific kind of the liquid crystal and the solvent of the cholesteric phase and the like will be omitted the same as the description of the first embodiment according to the present invention. However, the liquid crystal of the cholesteric phase is formed by including a chiral dopant capable of forming a liquid crystal of the cholesteric phase in the nematic liquid crystal and / or an optically active liquid crystal such as cholesterol and cholesteryl derivatives. It may include those formed by. At this time, if it includes a liquid crystal of the cholesteric phase formed through the nematic liquid crystal and the chiral dopant, 0.1 to 20 parts by weight of the chiral dopant is mixed with respect to 100 parts by weight of the nematic liquid crystal prior to step (1). Mixing at 100 ° C. for 1 to 24 hours may further include a step of forming a cholesteric liquid crystal phase, or the forming step may be simultaneously performed in step (1).

According to a preferred embodiment of the present invention, the shell-forming component may be included in step (1) in the monomer or oligomer state to be formed through polymerization or mixed in the polymer state from the beginning.

First, the step (1) when mixed in the monomer or oligomer state may further include an initiator for polymerization. In this case, the monomer or oligomer may be used without limitation in the case of the shell forming component used in the manufacture of the liquid crystal capsule in the art. Preferably, styrene, p- or m-methylstyrene, p- or m-ethylstyrene, p- or m-chlorostyrene, p- or m-chloromethylstyrene, styrenesulphonic acid, p- or m- Or t-butoxystyrene, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth ) Acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, Polyethylene glycol (meth) acrylate, methoxy polyethylene glycol (meth) acrylate, glycidyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, vinyl acetate, vinyl Propionate, vinyl butyrate, vinyl Tertyl, allyl butyl ether, allyl glycidyl ether, unsaturated carboxylic acids, such as (meth) acrylic acid and maleic acid, alkyl (meth) acrylamide, (meth) acrylonitrile, etc. can be used in mixture of 1 or more types. The amount of the monomer may be added in an amount of 50 to 70% by weight based on the total capsule particles. If the monomer is added in less than 50% by weight, it may be difficult to obtain the desired liquid crystal capsule because the capsule is not properly formed. If the amount exceeds 70% by weight, the thickness of the shell portion of the liquid crystal capsule is thick or the liquid crystal capsule does not contain liquid crystal. There may be a problem that can be formed.

In the case of the polymerization initiator may be used according to the monomer or oligomer and polymerization method specifically used, but is not particularly limited in the present invention, as a non-limiting example, benzoyl peroxide, lauryl peroxide, o- Chlorobenzoyl peroxide, o-methoxybenzoyl peroxide, t-butylperoxy-2-ethylhexanoate, t-butylperoxyisobutylate, 1,1,3,3-tetramethylbutylperoxy-2 Peroxides such as ethylhexanoate, dioctanoyl peroxide, didecanoyl peroxide, 2,2-azobisisobutyronitrile, 2,2-azobis (2-methylbutyronitrile), 2 Azo compounds, such as 2, 4- azobis (2, 4- dimethylvaleronitrile), etc. can be used individually or in combination of 2 or more types. In this case, the amount of the initiator may be 1 to 5 parts by weight based on 100 parts by weight of the monomer and / or oligomer in consideration of the effective starting efficiency. If less than 1 part by weight of the initiator may have a problem that the polymerization time is prolonged for a long time, when included in excess of 5 parts by weight polymerization rate is rapidly increased to form a low molecular weight polymer to form a smooth liquid crystal capsule There may be problems that may not be possible.

Next, when mixing the polymer of the polymerized state from the beginning may include a water-soluble or fat-soluble polymer, the water-soluble or fat-soluble polymer may include a water-soluble or fat-soluble polymer used in a conventional liquid crystal capsule, the water-soluble polymer It is preferable to use gelatin, melamine, polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone, a cellulose polymer, etc. individually or in mixture of 2 or more types. In addition, the fat-soluble polymer is preferably used alone or in combination of two or more polybutadiene, polyurethane, polyurea, gum arabic.

The emulsifier is to form a more stable colloid, the emulsifier may be a known conventional emulsifier used in the art for preparing a liquid crystal capsule, the specific kind is not limited in the present invention, but is not limited thereto. For example, arabic gum, acacia gum, albumin, casein, or synthetic emulsifiers such as polyacrylic acid, polyethylene, and amine may be used alone or in combination. . The emulsifier may be included in an amount of 50 to 70 parts by weight based on 100 parts by weight of the colloidal liquid crystal. If the emulsifier is included in an amount of less than 50 parts by weight, the stable colloid formation may be insignificant, and thus the liquid crystal capsule including the liquid crystal may not be smoothly produced. If it is included in excess of 70 parts by weight of the shell may be increased, there is a problem such as agglomeration of capsules or reduced transmittance.

The pH adjusting agent can be used in the art for the manufacture and stabilization of complex coacervation without limitation, non-limiting examples thereof, citric acid (citric acid), acetic acid, sodium hydroxide (sodium hydroxide), etc. Can be used. The use amount of the pH adjusting agent may be designed differently depending on the degree to the desired pH is not particularly limited in the present invention.

Next, as step (2), comprising the step of gelling and curing the emulsion.

In order to gel the emulsion, the temperature of the emulsion prepared in step (1) may be slowly cooled to 20 to 30 ° C. for 3 to 30 hours, and then rapidly cooled to 5 to 15 ° C., more preferably to 10 to 13 ° C. have. If the temperature does not satisfy the above range, the manufacturing of the liquid crystal capsule may not be smooth.

Thereafter, a step of curing the gelled emulsion is performed, and the curing may use a compound capable of crosslinking the shell forming component. Such a crosslinking agent may be used depending on the type of the monomer, oligomer, or polymer used as the shell-forming component, and is not particularly limited in the present invention. As a non-limiting example, divinylbenzene, 1,4-divinyloxybutane, divinyl sulfone, diallyl phthalate, diallyl acrylamide, triallyl (iso) cyanurate, trially trimellitate, etc. Allyl compound, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, penta aryl tritol tetra (meth) acrylate, penta aryl tritol tri (meth) acryl Late, pentaaryl tritol di (meth) acrylate, trimethylol propane tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, inpenta aryl tritol penta (meth) acrylate, glycerol (Poly) alkylene glycol di (meth) acrylates, such as tri (meth) acrylate, glutaraldehyde, formaldehyde, etc. can be used individually or in combination of 2 or more types. In this case, when using gelatine, which is a water-soluble polymer, as the shell forming component, as crosslinking agent, glutaaldehyde and formaldehyde are used alone or in mixture, and in the case of using formaldehyde as a crosslinking agent, a pH adjusting agent such as sodium hydroxide may be additionally used. It is more preferable to adjust to 8-9. The amount of the crosslinking agent is preferably used in the range of 10 to 20 parts by weight based on 100 parts by weight of the polymer of the shell forming component prepared by the monomer and the oligomer, and may be stirred for 10 to 60 minutes after the crosslinking agent is added. . If the amount of the crosslinking agent is used less than 10 parts by weight of the liquid crystal capsules can be produced microcapsules in which the surface is partially recessed, if used in excess of 20 parts by weight of the liquid crystal capsules are not separated and produced as a desired infrared There may be a problem that the reflection effect cannot be achieved.

In order to prevent gelation of the shell formed after step (2), a liquid crystal capsule prepared by treating a gelling agent such as silicone type, acrylic, polyvinyl alcohol (PVA), etc. It can be aged for 1 to 48 hours at 0 to 25 ° C.

When preparing the liquid crystal capsule, the diameter of the capsule can be controlled using a method known in the art in the emulsification and shell formation process of the liquid crystal during the manufacturing process, for example, when adding a surfactant to the preparation of the emulsion, the particle diameter is Larger liquid crystal capsules may be prepared and the particle diameter may also vary depending on the type of crosslinking agent used, temperature conditions, emulsification rate, and the like.

In the method of manufacturing a composite liquid crystal capsule according to the present invention, except that at least two or more of the first to third liquid crystal capsules are included instead of the cholesteric liquid crystal in the above-mentioned liquid crystal capsule manufacturing method (1). It may be the same as the liquid crystal capsule manufacturing method, a description thereof will be omitted below.

On the other hand, the present invention is a support substrate; And an infrared reflecting layer including a cured infrared reflecting film composition according to

claim

1 or 2 formed on the support substrate.

Specifically, Figure 10 is a cross-sectional view of the infrared reflecting film according to an embodiment of the present invention, the support substrate 10 and the infrared reflecting film composition according to the present invention formed on the support substrate 10 is cured and included infrared A reflection layer 30 is included, and the infrared reflection layer 30 includes a first liquid crystal capsule 31, a second liquid crystal capsule 32, and a third liquid crystal capsule 33. In addition, the infrared reflective layer 30 may further include a protective film (not shown) used in the art known in the art having a releasability on top.

In addition, Figure 11 is a cross-sectional view of the infrared reflecting film according to an embodiment of the present invention, the support base 210 and the infrared reflecting film composition according to the present invention formed on one surface on the support base 210 is cured and included Including an infrared reflecting layer 220, the infrared reflecting layer 220 is a composite liquid crystal capsule (221, 222, including a first liquid crystal capsule (221a), a second liquid crystal capsule (221b) and a third liquid crystal capsule (221c) 223). In addition, the infrared reflective layer 220 may further include a protective film (not shown) used in the art known in the art having a releasability on top.

First, the

support base materials

10 and 210 are demonstrated.

The supporting

substrates

10 and 210 may support the infrared reflecting layer, and in the case of the supporting substrate used for the infrared reflecting film, the supporting

substrates

10 and 210 may be used without limitation in the present invention. However, depending on the application, a support substrate having high light transmittance may be used. Examples of the support substrate having high light transmittance, particularly high transmittance to visible light, include polymer films for various optical films used as members of display devices of liquid crystal displays. Examples of such polymer films include polyester films such as polyethylene terephthalate (PET) and polybutylene terephthalate, polyethylene naphthalate (PEN), polycarbonate (PC) films, polymethyl methacrylate films, polyethylene and polypropylene, and the like. Polyolefin film, polyimide film, triacetyl cellulose (TAC) film and the like. Among these, polyethylene terephthalate or triacetyl cellulose is preferable.

The thickness of the

support substrates

10 and 210 is not particularly limited, and may be changed in consideration of the total thickness of the desired infrared reflecting film, but preferably 1 to 200 μm. If the thickness of the support substrate is less than 1㎛ may have problems in handling and process, if the thickness exceeds 200㎛ is not very desirable in terms of thinning of the infrared reflecting film.

Next, the infrared reflecting

layers

30 and 220 formed on the support bases 10 and 210 will be described.

The infrared reflecting layer is included in the cured infrared reflecting film composition according to the present invention.

The infrared reflecting layer 30 of FIG. 10 includes the cured infrared reflecting film composition according to the first embodiment of the present invention as described above, and includes the first liquid crystal capsule 31 and the second liquid crystal capsule 32 in the infrared reflecting layer. ) And a third liquid crystal capsule 33.

In addition, the infrared reflecting layer 220 of FIG. 11 includes the

liquid crystal capsules

221, 222, and 223 as the infrared reflecting film composition according to the second embodiment of the present invention is cured and included. The complex

liquid crystal capsules

221, 222, and 223 may include at least two liquid crystal capsules of the first liquid crystal capsule 221a, the second liquid crystal capsule 221b, and the third liquid crystal capsule 221c. All three may be included.

The infrared reflecting

layers

30 and 220 of FIGS. 10 and 11 may be implemented in a single layer as can be seen in the figure. That is, the conventional infrared reflecting film has to be composed of a multi-layer in order to reflect all the infrared rays in each wavelength range and / or to reflect both the left circular polarization and the right circular polarization infrared even in the infrared of the same wavelength range, but according to the present invention The infrared reflecting film can perform all the functions of the conventional multilayer infrared reflecting layer even if the infrared reflecting layer is a single layer, and can dramatically reduce the infrared reflecting film, and its effect is equally or remarkably excellent.

The infrared reflecting layer may be implemented as a multilayer or a single layer, but preferably may be a single layer in terms of thinning of the film. However, the "monolayer" may mean a region including the liquid crystal capsule or the composite liquid crystal capsule according to the present invention.

According to a preferred embodiment of the present invention, the thickness of the infrared reflecting layer may be preferably 1 to 3.6 times the diameter of the liquid crystal capsule or composite liquid crystal capsule contained in the infrared reflecting layer.

If the thickness of the liquid crystal capsule or the composite liquid crystal capsule included in the infrared reflective layer is less than 1 times the diameter, the liquid crystal capsule may be damaged or the liquid crystal capsule may be exposed on the surface during the manufacturing of the reflective layer including the liquid crystal capsule or the composite liquid crystal capsule. There is a problem, if the liquid crystal capsule or composite liquid crystal capsule having a thickness of more than 3.6 times the diameter of the infrared reflecting film is not very desirable in terms of thinning, the thickness of the infrared reflecting layer thickened when viewed in the vertical section of the reflecting layer In addition, even if the number of unfixed capsules or composite liquid crystal capsules that may be included in the vertical direction of the support substrate is increased, the increase in the infrared reflection effect may be insignificant, and the manufacturing cost may be increased due to the excessive liquid crystal capsules being included.

On the other hand, Figure 12 is a cross-sectional view of the infrared reflecting film according to an embodiment of the present invention, the support substrate 20 and the infrared reflecting film composition according to the present invention formed on one surface on the support substrate 20 is cured and included An infrared reflecting layer 40 is included, and the infrared reflecting layer 40 includes a first liquid crystal capsule 41, a second liquid crystal capsule 42, and a third liquid crystal capsule 43. In the infrared reflective film according to FIG. 6, the

liquid crystal capsules

31, 32, and 33 are vertically stacked on the support substrate 10, but the infrared reflective film according to FIG. 8 is used in the

liquid crystal capsules

41, 42, and 43. ) Is included as a single layer on the support base 20, it may be preferable in terms of thinning of the infrared reflecting film. Accordingly, the thickness of the infrared reflecting layer included in the infrared reflecting film in which the liquid crystal capsule (or the composite liquid crystal capsule) is disposed as shown in FIG. 8 may be 1.1 to 1.8 times the diameter of the liquid crystal capsule (or the composite liquid crystal capsule), and thus, the thickness is very thin. Nevertheless, it is possible to implement an infrared reflecting film having a significant effect on infrared reflection. If the thickness of the infrared reflecting layer is less than 1.1 times the diameter of the liquid crystal capsule, the liquid crystal capsule may be damaged during the manufacturing process, and the liquid crystal capsule may be exposed to the surface, thereby preventing the desired infrared reflecting effect from being used. There may be, and if it exceeds 1.8 times, it may not be desirable to thin the desired reflective film.

Although the infrared reflecting film according to the present invention described above has a single layer, the infrared reflecting efficiency of each wavelength range is excellent, so that the average light transmittance of the 800-1400 nm wavelength range is 1-10%, and the average light of the 1400-1900 nm wavelength range. The transmittance is 1 ~ 10%, the average light transmittance of 1900 ~ 2500nm band range can be 1 ~ 10%, and accordingly the reflection efficiency of infrared ray can be remarkably excellent for each wavelength range, simply 800 ~ 2500nm wavelength band Compared with an infrared reflecting film having an average light transmittance of 1 to 10%, it can be seen to have an excellent infrared reflecting effect, and windows and automobiles using the infrared reflecting film may be better in terms of heat shielding effect.

In addition, the infrared reflecting film according to the present invention may have a visible light transmittance of 80 to 99%. Accordingly, the infrared reflecting effect may be very excellent and the visible light transmittance may be very good.

In addition, the infrared light reflecting film according to the present invention may be integrated with other supporting members such as laminated glass. In this case, the support base may be integrated with other support members, or the support base may be peeled off and only the infrared reflecting layer may be integrated with the support member.

On the other hand, the present invention includes an infrared reflecting film including a support substrate; a liquid crystal layer formed of a plurality of liquid crystals having different pitches in order to reflect the infrared wavelength band region on the support substrate.

According to an exemplary embodiment of the present invention, the plurality of liquid crystals may be formed by encapsulating each of the liquid crystal capsules, and the liquid crystal capsules may include liquid crystals having the same pitch. In addition, each of the liquid crystal capsules may include a left liquid crystal or a preferential liquid crystal, so that the plurality of liquid crystal capsules may include a left liquid crystal capsule and a preferential liquid crystal capsule, and include liquid crystals having the same pitch. The liquid crystal capsule may also include a liquid crystal capsule including a preferential liquid crystal having the same pitch and a liquid crystal capsule including a left liquid crystal having the same pitch. Furthermore, one liquid crystal capsule of the plurality of liquid crystal capsules included in the liquid crystal layer includes a liquid crystal having the same pitch, but each liquid crystal capsule may independently include a liquid crystal having a different pitch, and thus the plurality of liquid crystal capsules The liquid crystal capsules include: a first liquid crystal capsule reflecting light in a wavelength region of 800 to 1400 nm, a second liquid crystal capsule reflecting light in a wavelength region of 1400 to 1900 nm; And a third liquid crystal capsule reflecting light in a wavelength range of 1900 to 2500 nm; At least two or more of them may be included, and more preferably, may include all of the first to third liquid crystal capsules. As a result, the light of various wavelengths can be reflected, thereby obtaining an improved infrared reflecting effect and at the same time, when forming the liquid crystal layer as a single layer, it may be advantageous in thinning the infrared reflecting film.

In detail, FIG. 13 is a graph showing a blocking ratio for each wavelength of an infrared reflecting film according to a preferred embodiment and comparative example of the present invention, and an infrared reflecting film including only a first liquid crystal capsule reflecting light in a wavelength range of 800 to 1400 nm ( Comparative Example 1) it can be seen that do not block the infrared wavelength range of more than 1400nm. In addition, an infrared reflecting film (Example 15) including a first liquid crystal capsule reflecting light in a wavelength region of 800 to 1400 nm and a second liquid crystal capsule reflecting light in a wavelength region of 1400 to 1900 nm (Example 15) is an infrared reflection according to Comparative Example 1. Compared to the film, it can reflect infrared rays in a wider wavelength range, but it can be seen that it may not block infrared rays in a wavelength range of 1900 nm or more. In contrast, the first liquid crystal capsule reflects light in the wavelength region of 800 to 1400 nm and the second liquid crystal capsule reflects light in the wavelength region of 1400 to 1900 nm. And it can be seen that the infrared reflecting film (Example 1) including all of the third liquid crystal capsule reflecting light in the wavelength range of 1900 ~ 2500nm (Example 1) is significantly blocking the infrared rays in the 800 ~ 2500nm wavelength range.

Detailed descriptions of the support substrate, liquid crystal having a different pitch for each wavelength region, liquid crystal capsule, and the like will be omitted as described above.

Infrared reflecting film according to the present invention described above (1) applying an infrared reflecting film composition according to the present invention on one surface on a support substrate; And

(2) applying pressure to the applied infrared reflecting film composition, and curing the composition to produce an infrared reflecting layer; can be prepared.

First, as step (1), the step of applying the infrared reflecting film composition according to the present invention on one surface on a support substrate.

The method of coating the infrared reflecting film composition on the support substrate may be a method known in the art, comma coating, reverse coating, gravure coating, blade coating, silk screen coating, roll coating, knife coating And slot die head coating may be used.

Next, as a step (2), applying a pressure to the applied infrared reflecting film composition, curing the composition to produce an infrared reflecting layer; includes.

Applying a predetermined pressure to the infrared reflecting film composition applied in the step (1) through a conventional method known in the art can adjust the thickness of the infrared reflecting film composition coating to the desired level.

14 is a schematic diagram of a method for forming an infrared reflecting layer according to an exemplary embodiment of the present invention. The infrared reflecting film composition 310 coated on the supporting substrate 300 is rolled through a roller substrate 320. Pressure may be applied, wherein the vertical distance (d) of the bottom surface of the roller substrate 320 and the support substrate may be 1.0 to 3.6 times the diameter of the

liquid crystal capsules

311, 312, and 312 included in the infrared reflecting film composition. For example, the thickness of the film may be 1.1 to 1.8 times. By satisfying the vertical distance as described above, it is possible to realize a desired thinner infrared reflecting layer, and to reduce the infrared reflecting effect due to damage or destruction in the film manufacturing process of the liquid crystal capsule (or composite liquid crystal capsule) included in the infrared reflecting layer. It can be minimized.

Next, the infrared reflecting film composition is cured. This curing process may be performed simultaneously with applying pressure to the infrared reflecting film composition, or may be performed after applying pressure. The curing process may be designed differently according to the curing type and specific type of the adhesive component included in the infrared reflecting film composition, but is not particularly limited in the present invention, but if the thermosetting adhesive component is used, thermal curing to 60 ~ 100 ℃ temperature In the case of a photocurable adhesive component can be cured to a light amount of 0.1 ~ 2J / ㎠ by using a mercury lamp having a wavelength of 300 ~ 400nm, in the case of an adhesive curing component of room temperature 0.1 ~ 24 hours at room temperature It can be cured by adjusting the curing rate so that it can be cured and aged during. The above specific curing conditions are only one example and can be carried out with other changes depending on the purpose.

Although the present invention will be described in more detail with reference to the following examples, the following examples are not intended to limit the scope of the present invention, which will be construed as to aid the understanding of the present invention.

1. Preparation Example 1-Preparation of Liquid Crystal Having a Cholesteric Phase

1) Manufacture of liquid crystal A

4-{[(1-methylheptyl) oxy] carbonyl} phenyl per 100 parts by weight of nematic liquid crystal (CH100, HCCH Co., Ltd.) for the preparation of cholesteric phase liquid crystals having a twisting direction to the left and a reflection pitch of 800 to 1400 nm. 3.1 parts by weight of 4- (hexyloxy) benzoate (S811, Merck) was added thereto to prepare a liquid crystal A by stirring at 65 ° C. for 12 hours.

2) Liquid Crystal B Manufacturing

4-{[(1-methylheptyl) oxy] carbonyl} phenyl with respect to 100 parts by weight of nematic liquid crystal (CH100, HCCH Co., Ltd.) for the preparation of cholesteric phase liquid crystals having a twist direction to the right and having a reflection pitch of 800 to 1400 nm. 3.1 parts by weight of 4- (hexyloxy) benzoate (R811, Merck) was added thereto to prepare Liquid Crystal B by stirring at 65 ° C. for 12 hours.

3) Liquid Crystal C Manufacturing

4-{[(1-methylheptyl) oxy] carbonyl} phenyl based on 100 parts by weight of nematic liquid crystal (CH100, HCCH Co., Ltd.) for the preparation of cholesteric phase liquid crystals having a twisting direction to the left and having a reflection pitch of 1400 to 1900 nm. 1.5 parts by weight of -4- (hexyloxy) benzoate (S-1011, Merck) was added thereto to prepare a liquid crystal C by stirring at 65 ° C. for 12 hours.

4) Liquid Crystal D Manufacturing

4-{[(1-methylheptyl) oxy] carbonyl} phenyl per 100 parts by weight of nematic liquid crystal (CH100, HCCH Co., Ltd.) for the preparation of cholesteric phase liquid crystals having a twist direction to the right and having a reflection pitch of 1400 to 1900 nm. 1.5 parts by weight of -4- (hexyloxy) benzoate (R-1011, Merck) was added thereto to prepare a liquid crystal D through stirring at 65 ° C. for 12 hours.

5) Liquid Crystal E Manufacturing

4-methoxybenzylidene-4'-butylaniline (MBBA), 4-n-pentyl-4'-cyanobiphenyl (5CB) (MBBA / for liquid crystal preparation of cholesteric phase with twisting direction to the left and 1900 to 2500 nm reflection pitch 0.8 parts by weight of 4-{[(1-methylheptyl) oxy] carbonyl} phenyl-4- (hexyloxy) benzoate (S811, Merck) was added to 100 parts by weight of 5CB, Merck, for 12 hours at 65 ° C. Liquid crystal E was prepared through stirring.

6) LCD F Manufacturing

4-methoxybenzylidene-4'-butylaniline (MBBA), 4-n-pentyl-4'-cyanobiphenyl (5CB) for the preparation of liquid crystals of cholesteric phase with a twisting direction to the right and a reflection pitch of 1900 to 2500 nm (MBBA / 5CB, Merck Co., Ltd.) 0.8 parts by weight of 4-{[(1-methylheptyl) oxy] carbonyl} phenyl-4- (hexyloxy) benzoate (R811, Merck) is added at 100 ° C. to 65 parts by weight. Liquid crystal F was prepared by stirring for 12 hours.

2. Preparation Example 2-Preparation of Liquid Crystal Capsule

50 parts by weight of gum arabic was added to 100 parts by weight of the liquid crystal A of Preparation Example 1 above, and dropped one by one to emulsify through ultrasonic irradiation at a strength of 1 kHz and 20 W at 65 ° C. for 15 minutes. 50 parts by weight of gelatin was added to 100 parts by weight of the liquid crystal to form a cell, followed by stirring for 30 minutes at a speed of 6,000 rpm. Thereafter, after adjusting the pH of the stirring solution to pH 4.8 through acetic acid, 50 parts by weight of gelatin was added to 100 parts by weight of the liquid crystal, and stirred for 30 minutes at the same stirring speed as described above. Then, the pH was adjusted to pH 4.8 again through the stirring solution. Thereafter, the temperature of the stirring solution was gradually cooled to 25 ° C. for 3 hours, and then rapidly stirred at 10 ° C. at a speed of 9,000 rpm. Thereafter, 11.1 parts by weight of glutaaldehyde as a crosslinking agent was added to 100 parts by weight of the gelatin to which the crosslinking agent was added, and the mixture was stirred for 40 minutes. Then, in order to prevent gelation of the shell, ammonia (basic) material was added at 1.5% by weight of the stirring solution and aged for 20 hours to prepare a liquid crystal capsule A having an average diameter of 10 μm. Liquid crystal capsule B containing the liquid crystal capsule F was prepared.

3. Preparation Example 3-Preparation of Complex Liquid Crystal Capsule

Each of the liquid crystal capsules A to F prepared in Preparation Example 2 described above was mixed at the same weight, and 50 parts by weight of Arabian gum was added to 100 parts by weight of the total liquid crystal capsules, and then dropped one drop at 1 kHz at 65 ° C. for 15 minutes. , Emulsified by ultrasonic irradiation of 20W intensity. In order to form a cell, gelatin was added 50 parts by weight based on 100 parts by weight of the total liquid crystal capsule, followed by stirring for 30 minutes at a speed of 800 rpm. Thereafter, after adjusting the pH of the stirring solution to pH 4.8 through acetic acid, 50 parts by weight of gelatin was added to 100 parts by weight of the liquid crystal, and stirred for 30 minutes at the same stirring speed as above. Then, the pH was adjusted to pH 4.8 again through the stirring solution. Thereafter, the temperature of the stirring solution was slowly cooled to 25 ° C. for 10 hours, and then rapidly stirred at 10 ° C. at a speed of 9,000 rpm. Thereafter, 11.1 parts by weight of glutaaldehyde as a crosslinking agent was added to 100 parts by weight of the gelatin to which the crosslinking agent was added, and the mixture was stirred for 40 minutes. Thereafter, to prevent gelation of the shell, ammonia (basic) material was added at 1.5% by weight of the stirring solution and aged for 20 hours to prepare a composite liquid crystal capsule having an average diameter of about 50 μm.

As an adhesive component, 880 parts by weight of liquid crystal capsules A to F prepared in Preparation Example 2 were mixed with respect to 100 parts by weight of an ultraviolet curable acrylic adhesive (HR6200, MIWON). At this time, the weight ratio of each of the A ~ F liquid crystal capsules were all equal to 1: 1. An infrared reflecting film composition having a viscosity of 50 cps was prepared by mixing an ester-based curing agent (Irgacure® 754, BASF) to 2.5% by weight of the adhesive component and stirring for 2 hours at a speed of 1,000 rpm.

The infrared reflecting film composition was coated on a PET (Hyosung) having a thickness of 50 μm so as to have a thickness of 18 μm using a comma coater, and the roller adjusted to have a vertical distance of 12 μm between the PET and the bottom of the roller part as shown in FIG. 9. High pressure mercury lamp region with primary wavelength of 365 nm and roughness of 100 mW / cm ² after primary hardening through the low pressure mercury lamp region with primary wavelength of 365 nm and roughness of 100 mW / cm ² for 5 seconds After the secondary curing for 5 seconds to prepare an infrared reflecting film as shown in Table 1.

The infrared reflecting film composition was applied to a PET having a thickness of 50 μm (commercial name, Hyosung) to be 18 μm using a comma coater, and adjusted to have a vertical distance of 12 μm between the PET and the lower end of the roller as shown in FIG. 9. After high pressure mercury with primary wavelength of 100 nm and roughness of 100 nmW / cm ² , it is first hardened by pushing through a roller and simultaneously undergoing low pressure mercury lamp region with 365 nm of dominant wavelength and 100 mW / cm ² roughness for 5 seconds. Secondary curing was performed via the lamp area for 5 seconds to prepare an infrared reflecting film as shown in Table 1 below.

Manufactured in the same manner as in Example 1, the diameter of the liquid crystal capsule prepared in Preparation Example and the content of each liquid crystal capsule in the embodiment, the content of the total liquid crystal capsule as shown in Table 1 below by changing the infrared reflection A film was prepared.

Comparative Example 1

Experimental Example 1

The following physical properties of the infrared reflecting films prepared in Examples and Comparative Examples were measured and shown in Table 1 below.

1. Evaluation of Dispersibility of Liquid Crystal Capsule (or Composite Liquid Capsule)

An optical microscope analysis was performed to evaluate the dispersibility of the liquid crystal capsules. The area without liquid crystal capsules within 1 mm2 of the liquid crystal capsule was calculated, and the uncovered area was less than 5% of the unit area. In the case of 10 to 15%,?, And 15% or more are indicated by ×.

2. Measurement of reflectance (or transmittance) by wavelength

Reflectance was measured by analyzing the reflection spectrum of each infrared wavelength band of the infrared reflecting film using a spectrophotometer (V-670, JASCO Co., Ltd.). The amount of reflection was calculated by measuring the amount of infrared rays transmitted through the infrared reflecting film in the irradiated infrared rays.

Table 1

TABLE 2

TABLE 3

Looking specifically at Tables 1 to 3,

Example 1 including both the first liquid crystal capsule and the third liquid crystal capsule and Example 2 including the liquid crystal capsule as a composite liquid crystal capsule include only the first liquid crystal capsule capable of reflecting infrared rays in the wavelength range of 800 to 1400 nm. Compared to Comparative Example 1, it is possible to block all infrared wavelength ranges, and it can be confirmed that the blocking rate is also very excellent.

In addition, in the case of Examples 3 and 4 in which the content of the liquid crystal capsule included in the infrared reflecting layer is decreased from the first liquid crystal capsule to the third liquid crystal capsule in consideration of the radiation intensity (see FIG. 2) of the infrared wavelength range reaching the ground surface. Compared to the infrared reflecting film implemented in Example 1, it can be confirmed that the blocking rate of each wavelength range of the infrared region is increased.

However, in Example 5 in which the first liquid crystal capsule is excessively included and Example 6 in which the second liquid crystal capsule is excessively formed, even infrared reflection effects are achieved in all wavelength ranges of 800 to 1400 nm, 1400 to 1900 nm, and 1900 to 2500 nm. It can be seen that the infrared blocking rate of the specific wavelength range is significantly reduced.

In addition, in Example 7, in which the content of the first and second liquid crystal capsules is significantly reduced, it is difficult to achieve an even infrared blocking effect in each wavelength range as the infrared blocking rate of the 800-1400 nm and 1400-1900 nm wavelength ranges is significantly reduced. can confirm.

Meanwhile, Example 8 in which the first to third liquid crystal capsules include only the left liquid crystal capsule, Example 9 in which the ratio of the left liquid crystal capsule and the preferential liquid crystal capsule are biased to either side, respectively, in the first to third liquid crystal capsules; Example 10 confirms that the infrared ray blocking rate is significantly reduced compared to Example 1, and this result can also be confirmed through FIG. 5.

In addition, in the case of Example 11 having a diameter of 20 μm and Example 12 having a diameter of 25 μm of each of the first to third liquid crystal capsules, it was confirmed that the infrared ray blocking rate of each wavelength region was increased compared to Example 1 having a diameter of 10 μm. However, in the case of Example 13 having a diameter of 35 μm, the infrared ray blocking rate of each wavelength range could not be increased anymore, but rather decreased in some wavelength ranges, so that the infrared ray blocking rate was increased due to the increase in the diameter of the liquid crystal capsule. It can be seen that it is not.

In addition, in Example 14, in which the diameter of the liquid crystal capsule is 0.5 μm, it can be seen that the blocking rate of the infrared wavelength range is significantly reduced.

On the other hand, in the case of Example 16 having a viscosity of 130 cps of the infrared reflecting film composition, the dispersion of the liquid crystal capsule is not very good, it can be seen that the blocking rate of the infrared wavelength range is significantly lowered, and the dispersion of the liquid crystal capsule is lowered As the liquid crystal capsules are concentrated, the visible ray blocking rate is increased.

In addition, in the case of Example 17 and Example 18, as the dispersibility of the liquid crystal capsule is significantly lowered, it can be seen that the blocking rate of the infrared wavelength range is remarkably lowered, and the dispersibility of the liquid crystal capsule is lowered as the liquid crystal capsule is concentrated. It can be seen that the visible light blocking rate is rather increasing.

Claims

Adhesive components;

A first liquid crystal capsule reflecting light in a wavelength range of 800 to 1400 nm;

A second liquid crystal capsule reflecting light in a wavelength range of 1400 to 1900 nm; And

And a third liquid crystal capsule reflecting light in a wavelength range of 1900 to 2500 nm.
Adhesive components; And

First liquid crystal capsule reflecting light in the wavelength region of 800 ~ 1400nm, Second liquid crystal capsule reflecting light of the wavelength region of 1800 ~ 1400nm And a complex liquid crystal capsule including at least two or more kinds of third liquid crystal capsules reflecting light in a wavelength range of 1900 to 2500 nm.
The method according to claim 1 or 2,

The adhesive component is an infrared reflecting film composition, characterized in that it comprises any one or more of thermosetting, photocurable and room temperature curable resin.
The method of claim 1,

The infrared reflecting film composition is an infrared reflecting film composition, characterized in that the first liquid crystal capsules to the third liquid crystal capsules 400 to 900 parts by weight based on 100 parts by weight of the adhesive component.
The method of claim 2,

The infrared reflecting film composition is an infrared reflecting film composition, characterized in that the composite liquid crystal capsules 400 to 900 parts by weight based on 100 parts by weight of the adhesive component.
The method of claim 1,

The infrared reflecting film composition is an infrared reflecting film composition comprising: 90 to 300 parts by weight of the first liquid crystal capsule and 90 to 200 parts by weight of the second liquid crystal capsule with respect to 100 parts by weight of the third liquid crystal capsule.
The method of claim 2,

The composite liquid crystal capsule is an infrared reflecting film composition comprising 90 to 300 parts by weight of the first liquid crystal capsule and 90 to 200 parts by weight of the second liquid crystal capsule with respect to 100 parts by weight of the third liquid crystal capsule.
The method according to claim 1 or 2,

Each of the first liquid crystal capsule to the third liquid crystal capsule

A core part including a cholesteric liquid crystal containing a chiral dopant in the nematic liquid crystal; And a shell portion including a water-soluble or fat-soluble polymer.

The chiral dopant is an infrared reflecting film composition, characterized in that it comprises a left dopant or a preferential dopant.
The method according to claim 1 or 2,

Each of the first liquid crystal capsule to the third liquid crystal capsule includes a left dopant liquid crystal capsule and a preferential dopant liquid crystal capsule,

Each of the first liquid crystal capsule to the third liquid crystal capsule includes a left-type dopant liquid crystal capsule and a preferential dopant liquid crystal capsule in a weight ratio of 1: 0.8 to 1.2.
The method of claim 8,

The average diameter of the liquid crystal capsule is an infrared reflecting film composition, characterized in that 10 to 30 times the average cross-sectional thickness of the shell portion.
The method according to claim 1 or 2,

Infrared reflective film composition, characterized in that the average diameter of any one or more of the first liquid crystal capsule, the second liquid crystal capsule and the third liquid crystal capsule is 1 ~ 30㎛.
The method of claim 2,

Infrared reflecting film composition, characterized in that the average diameter of the composite liquid crystal capsule is 30 ~ 200㎛.
The method according to claim 1 or 2,

The viscosity of the infrared reflecting film composition is an infrared reflecting film composition, characterized in that 30 ~ 100 cps at 25 ℃.
Support substrate; And

And an infrared reflecting layer formed by curing the infrared reflecting film composition according to claim 1 or 2 formed on the support substrate.
The method of claim 14,

The average thickness of the infrared reflecting layer is an infrared reflecting film, characterized in that 1 ~ 3.6 times the diameter of the liquid crystal capsule or composite liquid crystal capsule contained in the infrared reflecting layer.
The method of claim 15,

The average thickness of the infrared reflecting layer is an infrared reflecting film, characterized in that 1.1 ~ 1.8 times the diameter of the liquid crystal capsule or composite liquid crystal capsule contained in the infrared reflecting layer.
The method of claim 15,

The infrared reflecting film has an average light transmittance of 1 to 15% in the wavelength range of 800 to 1400 nm, an average light transmittance of 1 to 15% in the wavelength range of 1400 to 1900 nm, and an average light transmittance of 1 to 15 nm in the wavelength range of 1900 to 2500 nm. Infrared reflecting film, characterized in that%.
Support substrate;

And a liquid crystal layer in which a plurality of liquid crystals having different pitches are formed on the support substrate to reflect an infrared wavelength band region.
The method of claim 18,

Infrared reflecting film, characterized in that the plurality of liquid crystal is formed by encapsulating each liquid crystal capsule.
The method of claim 19,

The liquid crystal capsule is an infrared reflecting film, characterized in that it comprises a liquid crystal having the same pitch.
The method of claim 19,

The liquid crystal capsule is

A first liquid crystal capsule reflecting light in a wavelength range of 800 to 1400 nm;

A second liquid crystal capsule reflecting light in a wavelength range of 1400 to 1900 nm; And

A third liquid crystal capsule reflecting light in a wavelength range of 1900 to 2500 nm; At least two or more of the infrared reflecting film, characterized in that.
The method of claim 21,

Each of the liquid crystal capsules is an infrared reflecting film, characterized in that it comprises a left liquid crystal or a preferential liquid crystal.
(1) applying an infrared reflecting film composition according to claim 1 or 2 on one surface on a support substrate; And

(2) applying pressure to the applied infrared reflecting film composition, and curing the composition to produce an infrared reflecting layer; infrared reflecting film manufacturing method comprising a.
The method of claim 23, wherein

The pressure is based on the rolling method by the roller substrate, the vertical distance between the lower surface of the roller substrate and the support substrate is an infrared reflecting film, characterized in that 1.1 ~ 1.8 times the diameter of the liquid crystal capsule or composite liquid crystal capsule contained in the reflective layer.