KR20220105894A - Light valve comprised with low-E glass and method for manufacturing - Google Patents

Abstract

The present invention relates to a variable-transmittance window, wherein a PET film coated with a transparent conductive film on one side of a variable-transmittance layer using droplets for variable light control is used as a substrate, a heat reflective glass is used on the other side as a substrate, and the transparent conductive film and a heat reflective layer are adopted with an electric field to realize energy blocking characteristics and transmittance control characteristics at the same time, thereby simplifying manufacture and reducing manufacturing costs greatly. The present invention can control the amount of transmitted light while blocking view completely, so the present invention can be used for window glass for indoor partitions and buildings, various flat display devices used in the electronics industry and video equipment, replacements for various instrument panels and existing liquid crystal display devices, optical shutters, various indoor and outdoor advertisements, information displays, window glass and rear view mirrors of all transportation means such as vehicles, ships and aircrafts, sunroof glass, etc., and can be applied to glasses and safety glasses.

Description

Transmittance variable window combined with heat reflective glass and manufacturing method thereof {Light valve comprised with low-E glass and method for manufacturing}

The present invention relates to a variable transmittance window combined with a heat ray reflective glass and a method for manufacturing the same, and more particularly, by employing a transparent conductive layer of an existing heat ray reflective glass (low-e glass) as an electric field to provide energy blocking properties and transmittance control properties at the same time It relates to a variable transmittance window combined with a heat ray reflecting glass that can be expressed and a method for manufacturing the same.

The transmittance variable window (Light Valve) was first invented by E. H. Land of the United States in 1934 by U.S. Patent Nos. 1,951,664 and 1,955,923, and the shape of the light valve is between two transparent conductive substrates at narrow intervals. It has a structure in which a polarization suspension or a light variable control particle suspension is injected.

According to the invention of E. H. Rand, the liquid optical tunable particle suspension injected between two transparent conductive substrates has Brownian motion of the small optical tunable control particles or other optical tunable particles dispersed in the suspension when no electric field is applied. Therefore, most of the incident light is reflected, scattered, or absorbed by the particles, and only a small portion is transmitted.

When an electric field is applied to the above structure, an electric field is formed in the suspension through the two transparent conductive substrates, the upper and lower sheets. Light is transmitted between the particles or through the long axis of the particles, ultimately becoming transparent.

The problem raised in the initial transmittance variable window was by preventing the sedimentation of the variable light polarization particles and increasing the dispersibility of the light polarization variable particles by adding a dispersing aid to the liquid phase injected between two transparent conductive substrates. was solved by filming the optically polarizing suspension of

However, in case of applying the existing variable transmittance film to the manufacture of windows and doors, it was necessary to adhere to one side of the glass or to form a bonding structure inserted between the glass and the glass. Because it was a necessary structure, the manufacturing cost was high. In this case, it only functions as a variable transmittance window that blocks only visibility or a variable transmittance window that changes color and colorless. In addition, there was a disadvantage in that the manufacturing cost was greatly increased.

Republic of Korea Patent Publication No. 10-1993-0016495 (Aug. 26, 1993) Republic of Korea Patent Publication No. 10-2151969 (2020.08.31.)

The object of the present invention is a structure in which not only the blocking effect but also the energy saving characteristics are combined, the manufacturing is simple and the manufacturing cost can be greatly increased, and it is possible to block the field of view, control the amount of transmitted light, and heat ray reflection with excellent energy saving characteristics An object of the present invention is to provide a variable transmittance window combined with glass and a method for manufacturing the same.

In the transmittance variable window combined with the heat ray reflecting glass according to an embodiment of the present invention for solving the above technical problem, a transmittance variable layer in which liquid optical variable control droplets are dispersed by a phase separation method in a polymer resin, which is a film medium, is transparent It is characterized in that the film is bonded to the coated PT film, and the heat ray reflecting glass is bonded by a transparent adhesive layer coated on the other side of the transmittance variable layer.

As another embodiment, the heat ray reflecting glass of the present invention, the heat ray reflecting layer on which the transparent adhesive layer is laminated; and a glass substrate on which the heat ray reflection layer is laminated.

In another embodiment, the transparent conductive film and the heat ray reflecting layer of the present invention are characterized in that they are electrodes of an AC power source.

As another embodiment, the transparent adhesive layer of the present invention is characterized in that it contains a liquid crystal having an adhesive function and a light scattering function.

On the other hand, the method for manufacturing a transmittance variable window combined with a heat ray reflecting glass according to an embodiment of the present invention comprises the steps of: forming a transmittance variable layer in which liquid droplets for optical variable control are dispersed by a phase separation method in a polymer resin as a film medium; laminating a PT film coated with a transparent conductive film on one side of the transmittance variable layer; Laminating a heat ray reflective glass coated with a transparent adhesive layer on the other side of the transmittance variable layer; and pressing or thermocompression bonding the laminated state of the PT film and the heat ray reflecting glass with the transmittance variable layer interposed therebetween.

As another embodiment, the transmittance variable layer is laminated on the heat ray reflective layer of the heat ray reflective glass of the present invention, and the transparent conductive film is applied to a thickness of 10 to 20 micrometers on one side of the transmittance variable layer, and then the PT film It is characterized in that it is laminated.

As another embodiment, it is characterized in that the heat ray reflecting glass is laminated after the transparent adhesive layer is applied to a thickness of 5 to 30 micrometers on the other side of the transmittance variable layer of the present invention.

In another embodiment, the polymer resin of the present invention is characterized in that at least one or more of polyvinyl butyral, polyvinyl acetate, polymethyl methacrylate, and cellulose acetate.

In another embodiment, the transparent adhesive layer of the present invention is characterized in that the acrylic or silicone-based.

As another embodiment, the transparent adhesive layer of the present invention is characterized by mixing 10% by weight of an ultraviolet curable or heat-drying optical clear resin and 2 to 10% by weight of liquid crystal.

The present invention uses a PT film coated with a transparent conductive film on one side of the transmittance variable layer using droplets for light variable control as a substrate, and uses a heat ray reflective glass on the other side as a substrate, and the transparent conductive film and the heat ray reflection layer with an electric field Because it is a variable transmittance window that can simultaneously express energy blocking characteristics and transmittance control characteristics by adopting it, manufacturing is simple and manufacturing cost can be greatly increased. Window glass, various flat display devices used in the electronics industry and video equipment, various instrument panels and replacements for existing liquid crystal display devices, optical shutters, various indoor and outdoor advertisement and information displays, window glass of all transportation means such as automobiles, ships and aircraft, rearview mirrors and It can be used for a roof window glass (sun roof), etc., there is an advantage that can be applied to glasses and safety glasses.

1 is a cross-sectional structure showing a transmittance variable window completed by laminating a transmittance variable layer applied to a PTT film coated with a transparent conductive film and a substrate having an adhesive layer formed on the heat ray reflecting glass according to an embodiment of the present invention by roll compression. do.
2 is a transmittance-variable layer coated on a PT film coated with a transparent adhesive layer and a substrate on which an adhesive layer capable of exhibiting a vision blocking effect due to light scattering by containing liquid crystal in the heat ray reflecting glass according to another embodiment of the present invention; A cross-sectional structure diagram showing the permeability variable window completed by laminating by roll compression.
Figure 3 is a flowchart of a method of manufacturing a transmittance variable window combined with the heat ray reflecting glass of the present invention.

Hereinafter, in order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings 1 to 3 . Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. Accordingly, the shape of the elements in the drawings may be exaggerated to emphasize a clearer description.

1 is a cross-sectional structure diagram showing a transmittance variable window completed by laminating a transmittance variable layer coated on a PTT film coated with a transparent conductive film and a substrate having an adhesive layer formed on the heat ray reflecting glass according to an embodiment of the present invention by roll compression. 2 is a transmittance variable that is applied to a substrate on which an adhesive layer capable of exhibiting a visual blocking effect due to light scattering by containing liquid crystal in the heat reflective glass according to another embodiment of the present invention and a PT film coated with a transparent adhesive layer according to another embodiment of the present invention. It is a cross-sectional structural view showing the variable transmittance window completed by laminating the layers by roll compression, and FIG. 3 is a flowchart of the method of manufacturing the transmittance variable window combined with the heat ray reflecting glass of the present invention.

1, the transmittance variable window according to an embodiment of the present invention is a transmittance variable layer in which liquid droplets for optical variable control are dispersed by a phase separation method in a polymer resin 2, which is a film medium. A PT film 9 coated with a transparent conductive film 10 is laminated on one side of (1), and a heat ray reflection layer 6 coated with a transparent adhesive layer 8 on the other side of the transmittance variable layer 1 and Heat ray reflective glass 13 made of a glass substrate 7 is laminated, and the transparent conductive film 10 and the heat ray reflective layer 6 are used as electrodes of the AC power supply 11, and by operation of the switch 12 After coloring, the transparent state can be artificially adjusted according to the formation of the entire field.

When described in detail with reference to FIG. 2 , the transmittance variable window according to another embodiment of the present invention is a transmittance variable layer in which liquid droplets 5 for optical variable control are dispersed by a phase separation method in a polymer resin 2 as a film medium. A PT film 9 coated with a transparent conductive film 10 is laminated on one side of (1), and a liquid crystal 14 having both an adhesive function and a light scattering function is included on the other side of the transmittance variable layer 1 A heat ray reflective layer 6 coated with a transparent adhesive layer 8 and a heat ray reflective glass 13 made of a glass substrate 7 are laminated, and the transparent conductive film 10 and the heat ray reflective layer 6 are connected to an AC power supply 11 ), the transparent state in the order of opaque coloring, coloring, and colorlessness by operation of the switch 12 can be artificially adjusted according to the formation of the electric field.

At this time, the optical tunable control droplet (5) is composed of a suspension (3) dispersed in the polymer resin (2) as a film medium, and optically variable particles (4) that are irregularly Brownian motion inside the suspension (3). has been

3, the method for manufacturing a transmittance variable window combined with a heat ray reflecting glass of the present invention is a method in which a liquid droplet (5) for optically variable control is dispersed by a phase separation method in a polymer resin (2), which is a film medium. Forming a transmittance variable layer (1) (S10); Laminating a PT film 9 coated with a transparent conductive film 10 on one side of the transmittance variable layer 1 (S20); Laminating the transparent adhesive layer (8) coated with the liquid crystal 14 on the other side of the transmittance variable layer (1) (13) the heat reflective glass (13) (S30); and pressing or thermocompression bonding the laminated state of the PT film 9 and the heat ray reflective glass 13 with the transmittance variable layer 1 interposed therebetween (S40).

That is, after applying a droplet 5 for phototunability control consisting of a suspension 3 in which the phototunable particles 4 are dispersed and a coating solution containing a polymer resin 2, a phase separation method (solvent volatilization, polymerization or heat hardening, etc.) to form the dispersed variable permeability layer 1 .

And, on one side (right side of FIG. 1) of the transmittance variable layer 1, the liquid polymer transparent conductive film 10 is coated with a thickness of 10 to 20 micrometers, and then the PTT film 9 is laminated. desirable.

After applying the transparent adhesive layer 8 to a thickness of 5 to 30 micrometers on the other side (left side of FIG. 1) of the transmittance variable layer 1, laminating the heat reflecting layer 6 of the heat reflecting glass 13 is desirable.

At this time, the thickness of 5-30 micrometers of the transparent adhesive layer 8 is a light scattering function and an adhesive function by mixing 2 to 10% by weight of the liquid crystal 14 with 10% by weight of an ultraviolet curable or heat-dried optical clear resin. It is preferable to manufacture so as to have at the same time.

The polymer resin (2) used in the phase separation method by solution volatilization of the present invention has a refractive index in the range of 1.42 to 1.52, and polyvinyl butyral showing incompatible or partial compatibility with the suspension (3) or liquid crystal (14) , It is preferable to select a thermoplastic resin such as polyvinyl acetate, polymethyl methacrylate, or cellulose acetate.

In order to mix the droplet 5 and the liquid crystal 14 for optical variable control with the polymer resin 2, first, a solution of the polymer resin 2 in which the polymer resin 2 is dissolved in a specific solvent must be prepared.

The solvent of the polymer resin (2) used in the present invention is an ester-based solvent such as isoamyl acetate, benzyl acetate, ethyl acetate, or methyl acetate that does not react with or affect the properties of the liquid crystal (14) or the droplet (5) for phototunability control. It is preferable to prepare the polymer resin (2) solution using the solvent of the aromatic hydrocarbon type solvent such as toluene and xylene.

When the film of the present invention is manufactured, it is incompatible or partially compatible with the polymer resin (2), which is a film medium, and is a liquid optically variable particle (5) containing a dispersion medium having a similar refractive index. ) and a solution of the polymer resin (2) dissolved in a solvent that does not affect the optical properties of the suspension (3) and the optically variable particles (4) is preferably mixed homogeneously. The mixed solution is prepared in the same way.

At this time, if the mixed solution containing the liquid crystal 14 is coated on the polymer resin 2 to a certain thickness and then the solvent is volatilized or polymerized and thermosetted at room temperature or a constant temperature, the polymer resin 2 is solidified and phase separation occurs. A film-type transmittance variable layer (1) in which a liquid droplet (5) and liquid crystal (14) are dispersed in a polymer resin (2) for optically variable control is made.

According to the mixing ratio of the polymer resin (2) and the liquid droplet (5) for optical variable control, the ratio of the polymer resin (2) and the liquid crystal (14), and the ratio of the mixing amount of the optical variable control droplet (5) and the liquid crystal (14) It is dispersed in the form of minute droplets 5 for optical variable control or in the form of irregularly connected droplets 5 for optical variable control.

The transmittance variable window is completed by attaching the PT film 9 coated with the transparent adhesive layer 8 and the heat ray reflecting glass 13 to the transmittance variable layer 1 made in this way. In this case, the size of the dispersed optical tunable control droplet 5 is 1 to 30 micrometers, and the form in which the optical tunable control droplet 5 is irregularly connected is the volatilization rate of the solvent and the optical tunable control droplet 5. It is determined according to the concentration of each component constituting the composition, the liquid crystal 14, the optically variable control droplets 5 used, the viscosity of the polymer resin (2) solution, and the compatibility with the polymer resin (2).

When a relatively low electric field is applied to the transmittance variable window of the present invention, the dispersed fine liquid crystal 14 is activated and the scattering effect disappears and becomes transparent. Since the optically variable particles 4 contained in the regulating droplet 5 or in the suspension 3 separated by a connected structure are arranged parallel to the full length, they gradually become transparent and become colorless.

And in the case of a variable speed, the speed at which the scattering effect disappears depends on the characteristics of the liquid crystal 14, and the transparency rate depends on the viscosity of the liquid droplet 5 for optically variable control, in particular, the amount of the dispersion aid added, the concentration of the plasticizer, and the optically variable particles. It is determined according to the size and concentration of (4).

The present invention is a film capable of artificially controlling the visibility and light transmittance by forming the electric field. When the electric field is not formed, it maintains an opaque colored state according to the scattering effect of light, and when the electric field is formed, it is first It maintains a transparent colored state and gradually changes to a colorless and transparent state.

This process exhibits reversible repetition characteristics of more than 200,000 times. The improvement of transmittance in the colorless and transparent state and the improvement of clarity in the colored state are to match the refractive index of the plasticizer in the liquid droplet 5 for optical variable control and the refractive index of the polymer resin 2, which is the film medium, and use an appropriate amount of dispersing aid. This is possible by adding

The power source used is a periodic signal (alternating current), and it can be driven in the frequency range of 15 to 300 volts (RMS value) and 30 Hz to 10 kHz. That is, it becomes transparent or colored depending on whether an electric field is applied or not, and the response time to the electric field is within 0.1 to 2 seconds in case of discoloration, and within tens to hundreds of milliseconds in case of coloration.

The transparent conductive substrate used when manufacturing the transmittance variable window using the film of the present invention uses a glass or polymer film coated with a general transparent conductive film 10, but the gap between the left and right substrates is narrow, so foreign substances are mixed It is also possible to use a substrate on which a transparent insulating layer of about 200 to 1000 micrometers is formed on the transparent conductive film 10 in order to prevent a short circuit caused by the same.

Also, in the case of a reflective type variable transmittance window (eg, a rearview mirror for an automobile), a conductive metal thin film such as aluminum, gold, or silver, which is a reflector, may be directly used as an electrode.

If an electric field is not applied to the film of the present invention, it is opaque according to the scattering effect of the liquid crystal 14 and at the same time the optically variable particles 4 due to the Brownian motion of the optically variable particles 4 in the optical variable control droplet 5. It represents the coloration state by dichroism.

However, when an electric field is applied, the liquid crystal 14 is first aligned and becomes transparent, maintaining a colored state. After that, the optically variable particles 4 are arranged parallel to the electric field and a suspension material having a similar refractive index to that of the polymer resin 2 is formed. Because it is used, it is converted to a colorless and transparent state, and there is no scattering and transparency deterioration according to the viewing angle.

In addition, in terms of optical properties, when no electric field is applied, it shows a milky-white opaque state due to light scattering, and when an electric field is applied, it becomes clear. The disadvantage of being unable to completely block the view can be easily solved by using the film according to the present invention.

The transmittance variable window using the film according to the present invention is an indoor partition and window glass for construction, various flat display elements used in the electronic industry and video equipment, various instrument panels and substitutes for existing liquid crystal display elements, optical shutters, various indoor and outdoor advertisements and information. It can be used for the window glass, rearview mirror, and sun roof of all transportation means such as display panels, automobiles, ships, aircraft, etc., and can be applied to glasses and safety glasses.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited only to the following examples.

[Example 1]

A polymer resin (2) solution was prepared by dissolving 10 g of a polymer resin (2) as a film medium with 30 g of a solvent, and then 10 wt% of the optically variable particles (4), 85 wt% of a suspension (3) and 5 After adding 5 g of a liquid dispersant composed of a weight % dispersing aid, mechanically mixing for 30 minutes, ultrasonic mixing for about 2 hours, repeating this mixing process two more times, and then defoaming.

Then, the degassed mixture is applied to a thickness of 50 to 200 μm on the PT film 9 coated with the transparent conductive film 10, and then photo-tunable when the solvent is volatilized in a heating bath adjusted to room temperature or 90 to 120 ° C. The control droplet 5 begins to exist in the polymer resin 2 as a spherical light variable control droplet 5, and when the volatile matter is completely removed, the PT film 9 with a dry thickness of 20 ~ 80um is laminated. A transmittance variable layer (1) on one side is prepared.

[Example 2]

An acrylic or silicon-based optically transparent adhesive layer 8 is applied to a thickness of 10 to 30 micrometers on the coated surface of the heat ray reflecting glass 13 for construction, which has a laminated structure in which conductive FTO, ATO, or silver or gold is inserted into the dielectric layer. After drying or curing, the glass substrate 7 on which the transparent adhesive layer 8 is formed on the facing electrode is prepared.

[Example 3]

After covering the coated surface of Example 1 on the transparent adhesive layer 8 of Example 2, press-bonding and connecting electrodes to prepare a transmittance variable window.

[Example 4]

Among the compositions of Example 2, the liquid crystal 14 was changed to 2 to 10 wt% in 10 wt% of the adhesive resin of the same composition to make a mixture, and prepared in the same manner as in Example 2.

In this case, as the content of the liquid crystal 14 increases, the liquid droplet 5 for optical variable control in the polymer resin 2 is not dispersed into the spherical droplet 5 for optical variable control, and the optical variable control droplet 5 is mutually A film with a connected structure is made.

[Example 5]

After covering the coated surface of Example 1 on the transparent adhesive layer 8 of Example 4, press-bonding and connecting electrodes to prepare a transmittance variable window.

In this case, in the case of the variable transmittance window, when no electric field is applied, the transmittance variable window can be made in which the transmittance of the straight light due to scattering is close to zero.

[Example 6]

In the case of the droplet (5) film for controlling light variability by the polymerization method and scattering in Example 4, polymethyl methacrylate as a film medium and methyl methacrylate as a monomer are mixed in a 1:2 ratio to make a solution state, The liquid crystal 14 is added in an amount of 40% by weight of the film medium, and lauryl peroxide is added as a polymerization initiator in an amount of 10% by weight of the liquid crystal 14 to make a homogeneous solution.

Then, a small amount of DBB (divinylbenzene) is added as a crosslinking agent, and this homogeneous solution is coated to a thickness of 10 to 60 μm, then put into a reaction tank maintained at 90 ° C for polymerization, and a light scattering film with adhesive function is applied completed the board.

[Example 7]

By covering the preparation of Example 1 to Example 6, press-bonding, and connecting electrodes, a transmittance variable window was manufactured.

On the other hand, the present invention is not limited to the above-described embodiment, but can be practiced with modifications and variations within the scope without departing from the gist of the present invention, and the technical idea to which such modifications and variations are applied also falls within the scope of the following claims. have to see

1: permeability variable layer 2: polymer resin
3: suspension 4: optically variable particles
5: Droplet for light variable control 6: Heat ray reflection layer
7: Glass substrate 8: Transparent adhesive layer
9: PT film 10: transparent conductive film
11: AC power 12: switch
13: heat ray reflecting glass 14: liquid crystal

Claims (10)

The transmittance variable layer (1) in which liquid droplets (5) for optical variable control are dispersed by a phase separation method in a polymer resin (2), which is a film medium, is bonded to a PT film (9) coated with a transparent conductive film (10) become,
Transmittance variable window combined with heat reflective glass, characterized in that the heat ray reflecting glass 13 is bonded by a transparent adhesive layer 8 coated on the other side of the transmittance variable layer 1 . The method according to claim 1,
The heat ray reflecting glass 13,
a heat ray reflection layer 6 on which the transparent adhesive layer 8 is laminated; and
The transmittance variable window combined with the heat ray reflective glass, characterized in that it consists of a glass substrate (7) on which the heat ray reflective layer (6) is laminated. 3. The method according to claim 2,
The transparent conductive film (10) and the heat ray reflecting layer (6) is a transmittance variable window combined with a heat ray reflecting glass, characterized in that the electrode of the AC power source (11). 3. The method according to claim 2,
The transparent adhesive layer (8) includes a liquid crystal (14) having an adhesive function and a light scattering function. Forming a variable transmittance layer (1) in which liquid droplets (5) for optically variable control in a film medium (2) are dispersed by a phase separation method (S10);
Laminating a PTT film 9 coated with a transparent conductive film 10 on one side of the transmittance variable layer 1 (S20);
Laminating a transparent adhesive layer 8 on the other side of the transmittance variable layer (1) coated heat ray reflecting glass 13 (S30); and
Heat ray reflective glass, characterized in that it comprises a step (S40) of pressing or thermocompression bonding the laminated state of the PT film 9 and the heat ray reflective glass 13 with the transmittance variable layer 1 interposed therebetween A method of manufacturing a combined variable transmittance window. 6. The method of claim 5,
The transmittance variable layer 1 is laminated on the heat ray reflective layer of the heat ray reflecting glass 13, and the transparent conductive film 10 is coated on one side of the transmittance variable layer 1 to a thickness of 10 to 20 micrometers. Method for manufacturing a variable transmittance window combined with heat ray reflecting glass, characterized in that the PTT film (9) is laminated. 6. The method of claim 5,
On the other side of the transmittance variable layer 1, the transparent adhesive layer 8 is applied to a thickness of 5 to 30 micrometers, and then the heat ray reflective glass 13 is laminated. creative manufacturing method. 6. The method of claim 5,
The polymer resin (2) is polyvinyl butyral, polyvinyl acetate, polymethyl methacrylate, a method of manufacturing a variable transmittance window combined with heat reflective glass, characterized in that at least one or more of cellulose acetate. 8. The method of claim 7,
The transparent adhesive layer (8) is a method of manufacturing a variable transmittance window combined with a heat ray reflecting glass, characterized in that the acrylic or silicone-based. 8. The method of claim 7,
The transparent adhesive layer 8 is a transmittance variable window combined with heat ray reflective glass, characterized in that 10% by weight of UV curable or heat-dried optical clear resin and 2 to 10% by weight of liquid crystal 14 are mixed. manufacturing method.

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