CN102354010B - Energy-saving glass film and device using energy-saving glass film - Google Patents

Abstract

The embodiment of the invention provides an energy-saving glass film and a device using the same. The energy-saving glass film comprises a base material film; cholesteric crystal layers for infrared interruption which are coated on the base material film and comprise at least two cholesteric crystal layers; and cholesteric crystal layers for color embodiment, which are coated on the cholesteric crystal layers for infrared interruption and comprise at least three cholesteric crystal layers. According to the energy-saving glass film provided by the embodiment of the invention, a function of interrupting an infrared range is added, and thus the capability of minimizing indoor heat loss is realized. In addition, the cholesteric crystal layers for color embodiment are coated on the cholesteric crystal layers for infrared interruption, so that the performance of color embodiment is improved, and the reliability is improved.

Description

Energy-saving glass film and device using energy-saving glass film

technical field

The invention relates to a glass film, in particular to an energy-saving glass film and a device using the energy-saving glass film.

Background technique

Existing glass film is the film of the user's favorite color that is made by the coating mode of simple colored layer. This method has the disadvantage that the color will change with time, and the decolorization phenomenon will occur in the process of making the glass film, and the color expression effect is not good.

The patent literature of Chinese Patent Publication No. CN1714126 discloses a near-infrared-absorbing dye and a near-infrared-blocking filter, which provides a near-infrared-absorbing dye comprising a diimonium salt with a sulfonimide anion part , also discloses a near-infrared-blocking optical filter prepared by using the above-mentioned near-infrared-absorbing dye. However, the inventors of the present invention found that the method of blocking infrared rays with the above-mentioned general dyes has low reliability against heat and the dyes are easily exposed.

The patent document of Chinese Patent Publication No. CN101671965 discloses a preparation method of optically colored polyester film using microwave technology, and the polyester film is subjected to microwave coloring treatment through a coloring pool containing a microwave generator for water-phase stable disperse dye suspension , after water washing, solvent washing and final drying treatment, uniform optical color films of various colors are obtained. The optical color film prepared by the above method can be used for optical filters or optical protection films, and can also be used for glass window films in automobiles, homes and offices. However, the inventors of the present invention have found that the glass film for expressing color produced by the above-mentioned general dyes has low heat resistance reliability and the dyes are easily exposed.

Contents of the invention

The purpose of the embodiments of the present invention is to overcome the deficiencies of the prior art and provide an energy-saving glass film that blocks infrared rays through cholesteric liquid crystals, has color performance and high reliability, and can avoid dye exposure and bring Come the decolorization problem.

Another object of the embodiments of the present invention is to overcome the shortcomings of the prior art and provide a device using an energy-saving glass film.

In order to achieve the above purpose, on the one hand, an embodiment of the present invention provides an energy-saving glass film, and the energy-saving glass film includes:

Substrate film;

A cholesteric liquid crystal layer for infrared ray blocking, coated on the substrate film, comprising at least two cholesteric liquid crystal layers; and,

The color expressing cholesteric liquid crystal layer is coated on the infrared shielding cholesteric liquid crystal layer, and includes at least three cholesteric liquid crystal layers.

To achieve the above purpose, on the other hand, an embodiment of the present invention provides a device using the above-mentioned energy-saving glass film, and the device includes: energy-saving glass, automobiles or buildings.

The beneficial technical effect of the embodiment of the present invention is that: the energy-saving glass film of the embodiment of the present invention has the function of blocking the infrared region, thereby increasing the performance of reducing indoor heat loss to the greatest extent. In addition, the cholesteric liquid crystal layer for color expression is coated on the cholesteric liquid crystal layer for blocking infrared rays, so that the performance of color expression can be improved, the reliability can be improved, and the problem of decolorization caused by dye exposure can be avoided.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the structural representation of the energy-saving type glass film that utilizes the cholesteric liquid crystal coating of the embodiment of the present invention;

2 is a schematic diagram of the wavelength distribution of sunlight in an embodiment of the present invention;

Fig. 3 is the schematic diagram of the function of the cholesteric liquid crystal layer IR cutting layer for infrared ray blocking according to the embodiment of the present invention;

FIG. 4 is a comparison diagram between the absorption IR mode of the prior art and the reflection IR mode of the embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a Color LC layer for color expression according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

FIG. 1 is a schematic structural diagram of an energy-saving glass film using a cholesteric liquid crystal coating according to an embodiment of the present invention. As shown in Figure 1, the energy-saving glass film 100 is coated with at least two cholesteric liquid crystal layers for blocking infrared rays on the base film (Base substrate) 10, that is, the cholesteric liquid crystal layer for blocking infrared rays. (Infrared rays cutting LC layer) 20, on the cholesteric liquid crystal layer 20 for blocking infrared rays, at least three cholesteric liquid crystal layers for expressing color are coated, that is, the cholesteric liquid crystal layer 30 for color expression . Each cholesteric liquid crystal layer is bonded by an adhesive layer 40 (Bond), and there is no adhesive layer between the base film 10 and the first cholesteric liquid crystal layer 22 for shielding infrared rays. The thickness of the adhesive layer is preferably less than 2um.

The structural elements of the energy-saving glass film using the cholesteric liquid crystal coating in the embodiment of the present invention are described in detail below: a. base substrate, b. IR cutting LC layer, c. Color LC layer.

a.Base substrate, substrate film

The base film plays a role of supporting the glass film. Generally speaking, PET (polyester film, polyester film), PC (polycarbonate film, Polycarbonate Film), PS (polystyrene film, Polystyrene Film), OPP (oriented polypropylene film, Oriented Polypropylene Film), CPP (cast polypropylene film) or TAC (tri-cellulose acetate, Tri-cellulose Acetate) and other materials, on which a cholesteric liquid crystal coating layer is bonded. Furthermore, the thermal expansion coefficient of the base film is larger than that of the cholesteric liquid crystal and smaller than that of the adhesive. The thermal expansion coefficient distribution of the constituent elements in the embodiment of the present invention has the relationship of "cholesteric liquid crystal layer<substrate film<binder". The liquid crystal layer is distributed on both sides, and the adhesive is inserted in the middle. Therefore, even if the thermally fragile adhesive layer is deformed by heat, since both sides are supported by components with small deformation, it exhibits the characteristic that deformation due to heat and humidity can be minimized.

b.IR cutting layer, cholesteric liquid crystal layer for infrared blocking

FIG. 2 is a schematic diagram of wavelength distribution of sunlight in an embodiment of the present invention. As shown in FIG. 2 , in the case of sunlight, it includes a wide wavelength region from an ultraviolet region with a short wavelength to an infrared region with a long wavelength. In FIG. 2, the abscissa represents the wavelength of light, and the ordinate represents the intensity of sunlight. In the sunlight region shown below, the region of 400-700nm is the visible light region that can be observed by human eyes, and the region of 900-1400nm is the infrared region that generates the most heat in sunlight. Therefore, in order to achieve the highest thermal efficiency, if the area of 900-1400nm is blocked, the indoor temperature rise due to external sunlight can be prevented to the greatest extent, so that not only can the cooling effect be fully reflected in summer, but also the heat loss in the room can be blocked. To the outside, so that the effect of heat preservation can also be obtained in winter.

As shown in FIG. 3, the IR cutting layer of the cholesteric liquid crystal layer for infrared ray blocking in this embodiment is composed of at least two or more cholesteric liquid crystal coating layers. The sunlight incident on the IR cutting layer has a random polarization state in which the energy distribution of the light is random. The left-handed circularly polarized light is reflected on the second layer of cholesteric liquid crystal coating layer, and the right-handed circularly polarized light is reflected on the first layer of cholesteric liquid crystal. reflection on the layer. In this case, the center wavelength reflected on the first and second cholesteric liquid crystal layers is in the range of 900 to 1400 nm, and the wavelength region reflected on the first cholesteric liquid crystal layer is not less than 50 nm. At this time, the difference between the center wavelengths of the first layer and the second layer is in the range of 10nm. The wavelengths are different from each other. In addition, when it is composed of five or more cholesteric liquid crystal layers, the central wavelength of the fifth layer is different from the central wavelengths of the first to fourth layers. At this time, when the reflection area of each layer is set to △h, the following relationship is satisfied:

"Central wavelength of the third layer>(central wavelength of the first layer+△h)" and "central wavelength of the fifth layer>(central wavelength of the third layer+△h)";

Among them, the definition of the reflection area Δh refers to the width between two points with 1/2 intensity based on the reflected center wavelength.

In this embodiment, the central wavelength of the first layer and the second layer of the infrared shielding cholesteric liquid crystal layer is in the range of 900-1400 nm, the difference between the central wavelengths of the first layer and the second layer is within 10 nm, and the second The reflected polarization of one layer is opposite to that of the second layer.

In this embodiment, in the cholesteric liquid crystal layer for shielding infrared rays, the difference between the center wavelengths of the third layer and the fourth layer is within 10 nm, and the reflected polarized light of the third layer and the reflected polarized light of the fourth layer are opposite to each other.

In this embodiment, in the cholesteric liquid crystal layer for shielding infrared rays, the difference between the center wavelengths of the fifth layer and the sixth layer is within 10 nm, and the reflected polarized light of the fifth layer and the reflected polarized light of the sixth layer are opposite to each other.

The reason why multiple layers are provided in the embodiment of the present invention is that since the wavelength range reflected by one layer is very narrow, it is impossible to reflect all the wavelength ranges of 900-1400 nm that mainly generate heat. Therefore, by stacking (or providing) many layers, the thermal efficiency of reflecting all the wavelength regions where heat is generated is improved.

In this embodiment, although the first layer and the second layer have the same reflection bandwidth, they reflect different polarization states. Therefore, the first layer is a different structure than the reflection area of the third layer. In addition, although the third layer and the fourth layer have the same reflection bandwidth, they are structures in which reflected polarization states are different.

The above-mentioned cholesteric liquid crystal layer can block the infrared region which generates the most heat in sunlight, and by blocking infrared rays, the heat retention capacity can be improved in winter and the cooling capacity can be improved in summer.

In addition, on the base substrate in the IR cutting layer of the embodiment of the present invention, what is located in the first layer is bonded to the substrate film without an adhesive. Such characteristics can be increased by increasing UV exposure is obtained. By providing the optical film without an adhesive layer with the base film, the process can be simplified.

Fig. 4 is a comparison diagram of the absorption IR method of the prior art and the reflection IR method of the embodiment of the present invention. In the case of the absorption method, heat loss occurs in various directions, but in the case of the reflection method, since it is reflected to one side, it is possible to provide better characteristics of the IR blocking method by the reflection method. In Fig. 4, the right figure is the figure corresponding to the structure in the present invention.

c.Color LC layer, cholesteric liquid crystal layer for color expression

FIG. 5 is a schematic structural diagram of a cholesteric liquid crystal layer for color expression according to an embodiment of the present invention. As shown in Figure 5, the function of the Color LC layer is to reflect the color. The Color LC layer30 includes at least three layers of cholesteric liquid crystal coating layers that can reflect red, blue, and green colors. Through the combination of red, blue and green, various colors can be reflected, and the color can be adjusted through the light intensity ratio of each reflective layer. Specifically, the above-mentioned combination of cholesteric liquid crystal layers for color expression is a stacked layer or stacked layers formed in the order of blue, red, and green or in the order of red, blue, and green. In this embodiment, among the three liquid crystal layers, the green reflecting liquid crystal layer is located on the outermost edge. FIG. 5 schematically illustrates a red or blue reflective cholesteric liquid crystal layer 32 , a blue or red reflective cholesteric liquid crystal layer 34 , and a green reflective cholesteric liquid crystal layer 36 . Through the above arrangement, blue 41 , green 42 , and red 43 can be reflected accordingly in an embodiment.

Specifically, in the above-mentioned cholesteric liquid crystal layer for expressing color, the center wavelength of the blue-reflecting liquid crystal layer is in the range of 400 to 480 nm.

Specifically, in the cholesteric liquid crystal layer for expressing color, the central wavelength of the liquid crystal layer reflecting green is in the range of 500 to 560 nm.

Specifically, in the cholesteric liquid crystal layer for expressing color, the center wavelength of the liquid crystal layer reflecting red is in the range of 600 to 650 nm.

The three-layer liquid crystal layer is characterized in that it reflects only one of left-handed circularly polarized light and right-handed circularly polarized light. Each of the three liquid crystal layers reflects the R, G, and B regions. Each reflection bandwidth refers to reflecting one of left-handed circularly polarized light or right-handed circularly polarized light.

The reflection bandwidth of the cholesteric liquid crystal layer for expressing color is 50 nm or less. In the case of expressing color, the wider the wave width of red, blue, and green, the poorer the ability to express the color, and the narrower the wave width, the better the ability to express the color. Therefore, the reflection wavelength width on the color expressing layer of the present invention is 50 nm or less.

Furthermore, the birefringence of the liquid crystal used on the cholesteric liquid crystal layer for color expression is smaller than the birefringence of the liquid crystal used on the cholesteric liquid crystal layer for infrared shielding. In one embodiment, the birefringence of the liquid crystal used in the color expressing coating layer is 0.2 or less, and the birefringence of the liquid crystal used in the infrared shielding cholesteric liquid crystal layer is 0.2 or more. Through such characteristics, the performance of infrared ray blocking can be maximized, and the color expression can be maximized at the same time.

Optionally, the thickness of the cholesteric liquid crystal layer for blocking infrared rays is thicker than that of the liquid crystal layer for color expression. The wavelength region reflected by the cholesteric liquid crystal layer for blocking infrared rays is the infrared region, and the wavelength region reflected by the liquid crystal layer for color expression is the visible light region. Therefore, the wavelength of the reflection infrared region is longer than that of the color region, and the thickness of the cholesteric liquid crystal layer is desired to be thicker in order to obtain high reflectivity. For the above reasons, the thickness of the liquid crystal layer for infrared ray blocking is thicker than that of the liquid crystal layer for color expression.

Further, an embodiment of the present invention also provides a device using the above-mentioned energy-saving glass film, and the device includes: energy-saving glass, automobiles or buildings.

The advantage of the energy-saving glass film utilizing the cholesteric liquid crystal coating of the embodiment of the present invention is:

It is possible to provide an optical film with superior thermal blocking efficiency than the IR cutting glass film used in the past, and to provide an optical film with excellent color performance.

By using the reflective properties of liquid crystals to block the infrared region, which generates the most heat among the wavelengths of sunlight, indoor heat loss can be minimized.

The color performance is reflected by reflecting Red, Green, and Blue in the visible light region of the wavelength of sunlight, and adjusting the reflectance of R, G, and B to obtain the desired color.

The liquid crystal polymer used in the embodiment of the present invention has high reliability, higher thermal stability than dyes and substances used in general glass films, and can exhibit a very thin shape, thereby obtaining the characteristics of improving reliability.

Since the liquid crystal in the embodiment of the present invention does not use pigments or dyes, there is basically no problem of decolorization, and a glass optical film without the disadvantage of decolorization can be provided.

An optical film without an adhesive layer with a base film is provided, so that the process can be simplified.

The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them; although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions recorded in each embodiment are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (17)

1. an energy-saving glass film, is characterized in that, described energy-saving glass film comprises:

Base film;

Infrared ray blocking cholesteric liquid crystal layers, is coated on described base film, comprises at least two-layer cholesteric liquid crystal layers; In described infrared ray blocking, with in cholesteric liquid crystal layers, the centre wavelength of ground floor is between 900～1400nm; When described infrared ray blocking comprises five layers of cholesteric liquid crystal layers by cholesteric liquid crystal layers, meet relation as described below:

" the centre wavelength > of the 3rd layer (centre wavelength+△ h of ground floor) " and " the centre wavelength > of layer 5 (centre wavelength+△ h of the 3rd layer) ";

Wherein, the reflector space that △ h is each layer, the centre wavelength that described reflector space refers to reflect is benchmark, has the wide cut of the point-to-point transmission of its 1/2 intensity; And,

Color embodiment cholesteric liquid crystal layers, is coated on described infrared ray blocking with on cholesteric liquid crystal layers, comprises at least three layers of cholesteric liquid crystal layers.

2. energy-saving glass film according to claim 1, it is characterized in that, described infrared ray blocking embodies and is provided with each other tack coat by each cholesteric liquid crystal layers of cholesteric liquid crystal layers with cholesteric liquid crystal layers and described color, between described base film and the ground floor of described infrared ray blocking by cholesteric liquid crystal layers, there is no tack coat.

3. energy-saving glass film according to claim 1, is characterized in that, in described infrared ray blocking, by the birefraction of the liquid crystal using in cholesteric liquid crystal layers, than described color, embodies with using the birefraction of liquid crystal large in cholesteric liquid crystal layers.

4. energy-saving glass film according to claim 1, it is characterized in that, in described infrared ray blocking, with in cholesteric liquid crystal layers, the difference of the centre wavelength of ground floor and the second layer is in 10nm, and the reflection polarisation of ground floor is mutually contrary with the reflection polarisation of the second layer.

5. energy-saving glass film according to claim 4, it is characterized in that, in described infrared ray blocking, with in cholesteric liquid crystal layers, the 3rd layer is in 10nm with the difference of the centre wavelength of the 4th layer, and the reflection polarisation of the 3rd layer is mutually contrary with the reflection polarisation of the 4th layer.

6. energy-saving glass film according to claim 5, it is characterized in that, in described infrared ray blocking, with in cholesteric liquid crystal layers, the difference of the centre wavelength of layer 5 and layer 6 is in 10nm, and the reflection polarisation of layer 5 is mutually contrary with the reflection polarisation of layer 6.

7. energy-saving glass film according to claim 1, is characterized in that, at described color, embodies with in cholesteric liquid crystal layers, and the layer of reflection green is positioned at gabarit.

8. energy-saving glass film according to claim 1, is characterized in that, described color embodies at least three layers of coat by cholesteric liquid crystal layers with reflection Red, green, blueness.

9. energy-saving glass film according to claim 1, is characterized in that, it is below 50nm with the reflective band width of cholesteric liquid crystal layers that described color embodies.

10. energy-saving glass film according to claim 3, it is characterized in that, at described color, embodying is below 0.2 by the birefraction of the liquid crystal using in coat, in described infrared ray blocking, by the birefraction of the liquid crystal using in cholesteric liquid crystal layers, is more than 0.2.

11. energy-saving glass films according to claim 1, is characterized in that, embody with in cholesteric liquid crystal layers the scope that the centre wavelength of the liquid crystal layer of reflection blue is 400～480nm at described color.

12. energy-saving glass films according to claim 1, is characterized in that, embody with in cholesteric liquid crystal layers the scope that the centre wavelength of the liquid crystal layer of reflection green is 500～560nm at described color.

13. energy-saving glass films according to claim 1, is characterized in that, embody with in cholesteric liquid crystal layers the scope that the centre wavelength of the liquid crystal layer of reflection Red is 600～650nm at described color.

14. energy-saving glass films according to claim 1, is characterized in that, described infrared ray blocking embodies with the thickness of liquid crystal layer thick with color described in the Thickness Ratio of cholesteric liquid crystal layers.

15. energy-saving glass films according to claim 2, is characterized in that, the thickness of described tack coat is below 2um.

16. energy-saving glass films according to claim 1, is characterized in that, the thermal expansivity of described base film is larger and less than the coefficient of thermal expansion of cementing agent than the thermal expansivity of cholesteryl liquid crystal.

17. 1 kinds of devices that use energy-saving glass film, is characterized in that, described device comprises: energy-saving glass, automobile or buildings; Described energy-saving glass film is the described energy-saving glass film described in any one in claim 1-16.

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