JP2012136411A - Laminated glass and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide inexpensive laminated glass in which thermochromic particles are dispersed to a wide area of the laminated glass and the thermochromic properties are uniform in the wide area.SOLUTION: The laminated glass includes mutually adjacent glass layers and a resin layer provided between the glass layers, and thermochromic particles are dispersed nearly uniformly in the resin layer.

Description

  The present invention relates to a laminated glass having an automatic light control function.

  The thermochromic property is a property that causes a semiconductor-metal phase transition at a constant temperature and causes a reversible change in optical properties. As a material having this property, there is a material mainly composed of vanadium dioxide. By applying this thermochromic property to materials such as window glass, research has been conducted to impart the property of not transmitting light when the temperature rises. With respect to this material, applications such as saving energy for air conditioning are expected by transmitting or blocking sunlight according to the temperature.

  In Patent Document 1, metal-substituted vanadium dioxide in which vanadium dioxide or a part of vanadium atoms of vanadium dioxide is substituted with at least one atom selected from tungsten, molybdenum, niobium, and tantalum is supported on inorganic fine particles. A thermochromic material is disclosed. This technique is intended to obtain a thermochromic material that has high thermochromic characteristics with respect to infrared rays and, when incorporated in a film or the like, has high thermochromic characteristics with respect to infrared rays and high transparency in the visible light region. In addition, it is intended to obtain a thermochromic glass by forming a thermochromic film in which a thermochromic material is contained in a film or the like by sputtering or the like, and attaching the film to glass or sandwiching the film between glasses. Furthermore, a thermochromic material is applied to glass and formed on the glass surface to obtain a thermochromic glass.

  In Patent Document 2, a thin film containing vanadium dioxide and containing vanadium oxide as a main component is formed on a glass plate directly or via a tin oxide film by a thermal decomposition method (for example, a CVD method). In addition, a method of manufacturing a light control glass is disclosed in which a nitride film is formed by a thermal decomposition method as an antireflection film. This manufacturing method is intended to manufacture a light control glass that uses a thermal decomposition method, ensures a sufficient light control function by the vanadium oxide film, and suppresses a high reflectance due to the vanadium oxide film. is there.

Japanese Patent No. 4289023 JP 2007-22838 A

  According to the technique of Patent Document 1, it is difficult to disperse a particle having thermochromic properties on a film or glass surface with respect to a large area, which requires high cost. However, there is a problem that it cannot be applied. The sputtering method requires high heat for processing, so that the objects that can be processed are limited, and equipment for processing is also required, which requires high cost.

  According to the technique of Patent Document 2, although it is possible to form a thin film by a thermal decomposition method in a large area, there is a problem that uniformity of the thickness of the thin film cannot be ensured. Therefore, there may be a difference in the strength of the thermochromic characteristics for each part on the glass and the light transmittance by the thin film.

  Also, in the method of sputtering thermochromic particles on the surface of a glass plate, applying as a thin film, or sticking as a film, a layer having thermochromic particles is formed as a thin layer, so a certain amount or more of thermochromic If the particles cannot be contained and the density of the particles increases, there is a problem that the particles block the light regardless of the temperature condition and hinder the transparency of the glass. Thermochromic particles tend to agglomerate with each other, so it is necessary to disperse and refine the particles uniformly. However, in the method of sputtering, coating as a thin film, or pasting as a film, the particles can be uniformly dispersed in this way. Have difficulty. Furthermore, when the layer having thermochromic particles is a thin layer, the particles or layers are easily peeled off from the glass, and the thermochromic properties are easily lost.

  Accordingly, an object of the present invention is to provide a laminated glass in which thermochromic particles are dispersed over a wide area of the laminated glass and the thermochromic characteristics are uniform over a wide area, and a method for producing the same.

  Another object of the present invention is to provide a laminated glass that is simple and inexpensive to manufacture, and a method for manufacturing the same, without requiring special materials and equipment for manufacturing.

  According to the present invention, there is provided a laminated glass comprising glass layers adjacent to each other and a resin layer provided between the glass layers, wherein thermochromic particles are dispersed substantially uniformly in the resin layer.

  Because thermochromic particles are dispersed in the resin layer, it can be uniformly dispersed regardless of the size of the glass layer, and the thermochromic properties are adjusted according to the content of thermochromic particles relative to the resin and the thickness of the resin layer. And does not impair permeability. The laminated glass becomes a laminated glass having a glass layer and a resin layer, and has high strength while having a large area and thickness. Therefore, it has a thermochromic characteristic uniformly over a large area, and when it is used for a window of a building or a passenger car or the like, it becomes a laminated glass that does not transmit sunlight and can suppress an increase in indoor temperature when the temperature rises. The dispersion of the thermochromic particles into the resin and the production of the resin layer do not require a high temperature or the like, and do not require special production equipment.

  The glass layer is preferably float glass. A laminated glass having sufficient strength when combined with the resin layer can be obtained and is inexpensive.

  The resin layer preferably contains an acrylic resin. Thermochromic particles can be easily and uniformly dispersed, the content of thermochromic particles can be adjusted, and the strength of laminated glass can be increased when combined with a glass layer by combining strength and elasticity when cured. It can be easily processed into a laminated glass or the like and is inexpensive.

  It has a transition temperature of 10 to 45 ° C., and when the temperature rises from below the transition temperature to above the transition temperature, the infrared light transmittance is preferably lowered by 25% or more. 10 to 45 ° C. is a range that is assumed as the air temperature, and when the air temperature rises above the transition temperature, the infrared transmittance becomes low, so that the laminated glass can block sunlight and the like when the air temperature rises. .

  The visible light transmittance is preferably 40% or more. Since it has a high visible light transmittance, it is transparent and does not hinder the action as a window glass or the like.

  The method for producing a laminated glass of the present invention includes a step of dispersing thermochromic particles substantially uniformly in a flowable resin, and a step of injecting and solidifying the above-described resin between adjacent glass layers.

  Because thermochromic particles are dispersed in the resin layer, it can be uniformly dispersed regardless of the size of the glass layer, and the thermochromic properties are adjusted according to the content of thermochromic particles relative to the resin and the thickness of the resin layer. And does not impair permeability. The laminated glass becomes a laminated glass having a glass layer and a resin layer, and has high strength while having a large area and thickness. Therefore, it has a thermochromic characteristic uniformly over a large area, and when it is used for a window of a building or a passenger car or the like, it becomes a laminated glass that does not transmit sunlight and can suppress an increase in indoor temperature when the temperature rises. The dispersion of the thermochromic particles into the resin and the production of the resin layer do not require a high temperature or the like, and do not require special production equipment.

  According to the present invention, since the thermochromic particles are dispersed in the resin layer, the thermochromic particles can be uniformly dispersed regardless of the size of the glass layer, and the thermochromic particles can be dispersed depending on the content of the thermochromic particles relative to the resin and the thickness of the resin layer. The chromic properties can be adjusted and the permeability is not impaired. The laminated glass becomes a laminated glass having a glass layer and a resin layer, and has high strength while having a large area and thickness. Therefore, it has a thermochromic characteristic uniformly over a large area, and when it is used for a window of a building or a passenger car or the like, it becomes a laminated glass that does not transmit sunlight and can suppress an increase in indoor temperature when the temperature rises. The dispersion of the thermochromic particles into the resin and the production of the resin layer do not require a high temperature or the like, and do not require special production equipment.

It is a side view of the laminated glass which concerns on one Embodiment of this invention.

  FIG. 1 is a side view of a laminated glass according to an embodiment of the present invention. The laminated glass 1 of the present embodiment is roughly configured to include a glass layer 2 adjacent to each other and a resin layer 3 provided between the glass layers 2. In the example shown in the figure, the laminated glass 1 is configured such that a resin layer 3 is sandwiched between two glass layers 2 and is a laminated glass composed of two layers of glass and one layer of resin. A glass layer may be provided outside the glass layer 2, or a resin layer may be provided and a glass layer may be provided outside the resin layer. The resin layer may have a multilayer structure.

  The glass layer 2 is a main constituent member of the laminated glass 1, and is intended to cause the laminated glass 1 to exhibit a certain degree of strength by combining a plurality of layers while being light transmissive. The constituent material of each glass layer 2 is arbitrary as long as it is transparent or translucent and light-transmissive, and various types of glass can be used. The thickness of each glass layer 2 is preferably 2 mm or more in consideration of the thickness of the resin layer 3. In the present embodiment, a float plate glass having a thickness of 3 mm is used.

  The resin layer 3 is a layer mainly made of a resin, contains a light-transmitting resin, and is light-transmitting as a whole. The light transmissive property refers to a property of transmitting visible light and transparent or translucent. As the resin, a light-transmitting constituent material can be selected. The resin of the resin layer 3 can be selected from acrylic, urethane, polyester, or the like. These transparent resins can be made into a translucent resin layer 3 colored or dyed by containing a dye, pigment or the like. In the present embodiment, a transparent acrylic resin is included as the main constituent material of the resin layer 3. The thickness of the resin layer 3 is preferably 0.5 to 3 mm in consideration of the thickness of the glass layer 2. In this embodiment, the thickness is 1 mm.

  The resin layer 3 has thermochromic particles 4 dispersed substantially uniformly. Thermochromic particles are particles formed by combining a substance having thermochromic properties or this substance with another substance. The thermochromic characteristic is a characteristic in which the reflection state of light changes with a change in temperature. In the present embodiment, the thermochromic characteristic is a characteristic that becomes light transmissive particularly at a specific transition temperature or lower. Examples of the substance having thermochromic properties include vanadium dioxide, metal-substituted vanadium dioxide in which some of vanadium atoms of vanadium dioxide are substituted with at least one atom selected from tungsten, molybdenum, niobium, and tantalum. . The light transmittance of vanadium dioxide and metal-substituted vanadium dioxide changes through a phase transition between the semiconductor phase and the metal phase depending on the temperature. Vanadium dioxide changes in transmittance for wavelengths in the infrared region of about 800 nm or more at the transition temperature, and the transmittance for wavelengths below that hardly changes.

  The thermochromic particle 4 may be a substance having thermochromic properties as it is, or may be a particle formed by combining these substances with another substance so that the particle diameter can be easily adjusted and dispersed. In the thermochromic particles 4 of the present embodiment, vanadium dioxide is selected as a substance having thermochromic properties. The vanadium dioxide is coated on silica having an average of about 50 nm so as to have a thickness of about 5 nm, and thermochromic particles 4 are obtained.

  In the laminated glass 1, the light transmittance of infrared rays changes by 25% or more at a transition temperature of 10 to 45 ° C. by the action of the thermochromic particles 4 described above. The transition temperature depends on the characteristics of the thermochromic particles 4 and the thickness of the resin layer 3. Infrared rays here are electromagnetic waves having a wavelength of 800 nm or more, and are about 800 to 3000 nm as a guide.

  Laminated glass 1 has a visible light transmittance of 40% or more as a whole regardless of temperature conditions. The visible light here is an electromagnetic wave of 350 to 800 nm.

  In this laminated glass 1, since the acrylic resin of the resin layer 3 is a resin having a certain degree of elasticity and hardness, the laminated glass 1 is resistant to cracking and is hard to break, and the strength of the laminated glass 1 is complementarily complemented by the physical properties of the glass layer 2. It has the advantage of so-called laminated glass. Particles nano-coated with vanadium dioxide on fine monodisperse silica can be adjusted in diameter while having thermochromic properties, can be easily adjusted in content, and can be uniformly dispersed in the resin . These particles are uniformly dispersed in the resin, and have a thermochromic characteristic in which infrared light transmittance is low above the transition temperature, but does not hinder the light transmittance of the resin layer 3 below the transition temperature. From these effects, it is possible to obtain a glass having a light control effect at a size of 1000 mm × 1000 mm or more, which has been difficult with conventional techniques such as sputtering of thermochromic particles.

  The laminated glass 1 blocks light when the temperature is higher than the transition temperature, and does not block light below the transition temperature. Therefore, when the laminated glass 1 is used as a window glass for a building or a vehicle, the sunlight is taken into the room when the temperature is low to increase the temperature in the room or the vehicle, and the sunlight is blocked when the temperature is high. Reduce the temperature in the room or car. This action can save heating and cooling energy.

  Next, the manufacturing method of the laminated glass 1 is demonstrated. First, the thermochromic particles 4 are dispersed substantially uniformly in the resin in a fluid state. The method for producing the thermochromic particles 4 is not limited. For example, there is a method of producing and using fine particles having thermochromic properties in which vanadium dioxide or a part of other metals is substituted. Particularly, nano-sized particles (less than 1 μm) are used. There is a method of making thermochromic particles 4. There are other methods of combining with other substances, and various means for combining with fine particles such as silica with the above-described substances having thermochromic properties can be used. The thermochromic particles 4 are added to the resin in a fluid state and stirred while being crushed and refined to obtain a uniformly dispersed state.

  This fluidized resin is injected between two adjacent glass layers 2 and solidified. In the present embodiment, a curing agent is added to the resin immediately before injection, and the resin is injected between the two glass layers 2 to be solidified.

  All the embodiments described above are illustrative of the present invention and are not intended to be limiting, and the present invention can be implemented in other various modifications and changes. Therefore, the scope of the present invention is defined only by the claims and their equivalents.

  The laminated glass of the present invention can reduce these costs by reducing the energy used for heating and cooling, and is widely useful for energy consumption problems and environmental problems.

1 Laminated glass 2 Glass layer 3 Resin layer 4 Thermochromic particles

Claims (6)

  A laminated glass comprising glass layers adjacent to each other and a resin layer provided between the glass layers, wherein thermochromic particles are dispersed substantially uniformly in the resin layer.   The laminated glass according to claim 1, wherein the glass layer is float glass.   The laminated glass according to claim 1, wherein the resin layer contains an acrylic resin.   The infrared light transmittance decreases by 25% or more when the temperature rises from below the transition temperature to above the transition temperature, having a transition temperature of 10 to 45 ° C. The laminated glass of Claim 1.   The laminated glass according to any one of claims 1 to 4, wherein the visible light transmittance is 40% or more.   A method for producing laminated glass, comprising: a step of dispersing thermochromic particles substantially uniformly in a resin in a fluid state; and a step of injecting the resin between adjacent glass layers to solidify the resin .

Images