JP2010138688A - Electromagnetic-shielding laminated sheet glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electromagnetic-shielding laminated sheet glass having a sufficient electromagnetic-shielding performance to various statuses because a communication is conducted extensively over a considerably wide frequency range from broadcast waves to a radio LAN, the sensibility of a communication apparatus is also improved and a risk such as a malfunction, a tapping or the like is increased. <P>SOLUTION: In the electromagnetic-shielding laminated sheet glass, net bodies made of metals are inserted among the glass of the laminated sheet glass. In the electromagnetic-shielding laminated sheet glass, two-layer intermediate films (15 and 16) are manufactured by inserting the net bodies made of the metals among two intermediate films, and the laminated sheet glass (1) is manufactured by alternately laminating the panes and the two-layer intermediate films in order of the pane (10), the two-layer intermediate film (15), the pane (11), the two-layer intermediate film (16) and the pane (12) by using the three panes (10, 11 and 12) and the two two-layer intermediate films (15 and 16). In the electromagnetic-shielding laminated sheet glass, conductive films (41 and 42) are formed on surfaces on the air side of the planes (10 and 12) positioned on the outside. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electromagnetic shielding glass having a laminated glass structure, which is attached to an opening of an intelligent building, and more particularly to an electromagnetic shielding glass having high electromagnetic shielding performance in a frequency range of 10 MHz to 20 GHz.

  In recent years, a large amount of electronic devices and devices such as OA equipment and communication equipment are used in commercial buildings. Electromagnetic waves generated by many of these electronic devices / devices cause other electronic devices and electronic control devices to malfunction. It also causes noise.

  Furthermore, with the advancement of information technology, electromagnetic waves that enter from the opening may cause malfunction of electronic devices in the building.

  In addition, electromagnetic waves that exit from the opening may cause an external electronic device or the like to malfunction.

  For this reason, in many buildings, electromagnetic shielding performance has been imparted to the opening.

  There is known an electromagnetic shielding glass in which two intermediate films are used for laminated glass, a metal net is inserted between the intermediate curtains, and the metal net is bent at the edge of the glass to the surface of the laminated glass (patent) Reference 1).

  Furthermore, using three intermediate films for the laminated glass, a conductive mesh and a conductive film are inserted between the intermediate curtains, the conductive mesh and the conductive film are bent to the surface of the laminated glass at the edge of the glass, Furthermore, the electromagnetic shielding glass by which the electroconductive mesh and the electroconductive film are being fixed to the edge part of a laminated glass with the electroconductive tape is disclosed. As the conductive film, a film formed with a metal film or ITO film is used (Patent Document 2).

  Patent Document 3 discloses an electromagnetic shielding glass having a laminated glass structure in which a conductive net body is inserted between two intermediate films and has a shielding performance of 50 to 65 dB in a frequency range of 1 MHz to 30 MHz. In Patent Document 4, electromagnetic shielding of a multi-layer glass configuration in which a glass plate on which a conductive film is formed and a conductive net body are inserted into two intermediate films is configured using a last. Glass is disclosed and electromagnetic shielding performance is about 70 dB in the frequency range of 0.1 MHz to 20 GHz.

  Patent Document 5 discloses that a laminated glass in which one metal mesh is inserted between two intermediate films and a laminate in which two metal meshes are inserted into two intermediate films are made of last. An electromagnetic shielding glass having a glass configuration is disclosed, and an electromagnetic shielding performance of about 70 to 95 dB is described in a frequency range of 0.1 MHz to 1 GHz.

  Patent Document 6 discloses that the shielding performance is about 60 to 70 dB over 0.1 MHz to 20 GHz using an electromagnetic shielding multiple glass using two 65 to 150 mesh conductive nets.

  Patent Document 7 discloses a 10-30 dB electromagnetic shielding panel using a tin oxide film.

  In addition to electromagnetic shielding performance, sound insulation performance is required at the opening of a building. In order to improve the sound insulation performance of laminated glass, a sound insulation interlayer made of a transparent resin layer is used.

  For example, in Patent Documents 8 and 9, PVB having a different monomer composition ratio or molecular weight or a polyvinyl acetal resin having a different chemical structure from PVB is laminated as a transparent resin having a different chemical composition and different physical properties such as viscosity. A sound insulating interlayer is also disclosed.

  Patent Document 8 discloses that the average value of the amount of ethylene groups having 4 to 6 carbon atoms in the acetal group and bonded to the acetyl group is 8 to 30 moles with respect to the total amount of ethylene groups in the main chain. % Of at least one layer (A) composed of a polyvinyl acetal resin (A) and a plasticizer, and an average amount of ethylene groups having an acetal group having 3 to 4 carbon atoms and bonded with an acetyl group For laminated glass, in which a polyvinyl acetal resin (B) having a molar fraction with respect to the total ethylene group content of the main chain is 4 mol% or less and at least one layer (B) comprising a plasticizer are laminated. An interlayer film is disclosed.

  Patent Document 9 discloses that a layer (A) having a thickness of 0.05 mm or more composed of a polyvinyl acetal resin and a plasticizer and a layer (B) composed of a polyvinyl acetal resin and a plasticizer are layer (B) / layer (A ) / Layer (B), and the polyvinyl acetal resin of layer (A) is composed of polyvinyl alcohol having an aldehyde (a) having 6 to 8 carbon atoms and an aldehyde (b) having 2 to 4 carbon atoms. An acetalized resin, wherein the weight ratio of the portion acetalized with aldehyde (a) and the portion acetalized with aldehyde (b) is in the range of 60:40 to 100: 0, and the layer ( The polyvinyl acetal resin B) is a resin in which polyvinyl alcohol is coacetalized with an aldehyde (b) having 2 to 4 carbon atoms and an aldehyde (a) having 6 to 8 carbon atoms. The weight ratio of the portion acetalized with the binder (b) and the portion acetalized with the aldehyde (a) is in the range of 80:20 to 100: 0, and at least of the layer (A) and the layer (B) One polyvinyl acetal resin is a coacetalized resin, and a sound insulating interlayer is disclosed.

  In addition, as laminated glass with improved sound insulation performance, an interlayer film in which a film containing hydrogenated styrene / isoprolene / butadiene block copolymer is laminated between ethylene-vinyl acetate films is sandwiched between glass plates and heat-sealed. Patent Document 10 discloses a laminated glass obtained by bonding and integrating glass plates.

    The standard of the sound insulation performance of the sash is described in JIS A4706: 2000 “Sash”. That is, in JIS A4706: 2000, the sound insulation of the sash is divided into sound insulation grades T-1, T-2, T-3, and T-4. Sound is transmitted from one side of the sash, and the sound transmission loss of the sash is measured at each frequency defined in the JIS standard by measuring the reflection of sound by the sash and the decrease in sound pressure level due to absorption attenuation on the opposite side. In accordance with the -1 grade line, the T-2 grade line, the T-3 grade line, and the T-4 grade line, the sashes that meet the conditions described in the above JIS, that is, passed the sound insulation grade T-1 grade, respectively. , T-2 grade, T-3 grade, T-4 grade.

  FIG. 4 shows a graph of a sound insulation grade line described in JIS A4706: 2000.

  As shown in FIG. 4, in the sound insulation grade line due to sound transmission loss, the sound insulation performance of 500 Hz or more, the sound insulation grade T-3 grade is 35 dB or more, and the sound insulation grade T-4 grade is 40 dB or more. In order to pass the sound insulation grades T-3 and T-4, the sound transmission loss needs to substantially exceed the aforementioned grade line.

The decibel (dB) is a unit of the sound pressure level, and the sound pressure level is expressed as a dimensionless amount in which the pressure fluctuation is expressed logarithmically from the atmospheric pressure due to the sound and expressed in decibel (dB). The pressure fluctuation fluctuates 3.2 times at a sound pressure level of 10 dB. The sound pressure level is defined as 20 times the common logarithm of the ratio between the sound pressure P (unit: Pa) of a certain sound and the reference sound pressure P0 (2 × 10 ⁻⁵ Pa) which is the minimum human audible sound, It is expressed in dB.

  In order to pass the sound insulation grade T-4, the sound transmission performance of 35 dB or more at 500 Hz or more must be improved to 40 dB or more, that is, 5 dB or more, compared to the sound insulation grade T-3. Further, even in a frequency range of 125 Hz or more and 500 Hz or less, as shown in FIG. 4, the sound insulation performance must be improved by 5 dB or more along the sound insulation grade line shown in JIS A4706: 2000. The sound insulation performance of a glass sash that passes the sound insulation grade T-4 is comparable to a concrete wall of the same thickness, for example.

    The transmission sound loss is composed of a test room composed of a sound source room and a sound receiving room, a sound source device, a sound receiving device, and the like according to JIS A1416: 2000 “Method for measuring air sound blocking performance of building members in a laboratory”. It is measured by a measuring method using a test apparatus.

JP 11-312893 A Japanese Patent Laid-Open No. 10-322083 JP 2001-177291 A JP 2000-183586 A Japanese Patent Laid-Open No. 9-321484 Japanese Patent Laid-Open No. 2000-183484 JP 2004-346555 A JP-A-6-926 JP-A-5-104687 JP 2007-91491 A

  In recent years, communication has been performed over a fairly wide frequency range from broadcast waves to wireless LANs, and the sensitivity of communication devices has become high performance, increasing the risk of malfunctions and eavesdropping.

  This invention makes it a subject to provide the electromagnetic shielding laminated glass which has sufficient electromagnetic shielding performance with respect to such a condition.

The electromagnetic shielding laminated glass of the present invention is an electromagnetic shielding laminated glass in which a metal net is inserted between glasses, and the two-layer intermediate film is formed by inserting the metal net between two intermediate films. (15, 16), three glass plates (10, 11, 12) and two two-layer interlayer films (15, 16), a glass plate (10), two-layer interlayer film (15), A glass plate (11), a two-layer interlayer film (16), and a glass plate (12) are laminated in order of a glass plate and a two-layer interlayer film to form a laminated glass (1). 10 and 12) is an electromagnetic shielding laminated glass characterized in that a conductive film (41, 42) is formed on the air side surface.

  Moreover, the electromagnetic shielding laminated glass of the present invention is the electromagnetic shielding laminated glass, wherein the thickness of the glass plate (11) used in the center of the laminated glass (1) is 3 to 20 mm. It is glass.

  Moreover, the electromagnetic shielding laminated glass of the present invention is the electromagnetic shielding laminated glass of the previous term, wherein the glass (10, 12) used on the outside of the laminated glass (1) has a thickness of 3 to 10 mm. Laminated glass.

  The electromagnetic shielding laminated glass of the present invention is an electromagnetic shielding laminated glass characterized in that the conductive films (41, 42) are made of tin oxide in the electromagnetic shielding laminated glass of the previous term.

  Moreover, the electromagnetic shielding laminated glass of the present invention is an electromagnetic shielding laminated glass characterized in that the metal nets 31, 32 are 50 to 150 mesh in the electromagnetic shielding laminated glass of the previous term.

    Moreover, the electromagnetic shielding laminated glass of the present invention uses a sound insulating intermediate film for at least two of the four intermediate films in the electromagnetic shielding laminated glass of the previous period, and has a sound insulation rating in accordance with JIS A4706: 2000. It is a T-4 grade electromagnetic shielding laminated glass.

  The electromagnetic shielding laminated glass of the present invention makes it possible to provide a high-performance electromagnetic shielding laminated glass corresponding to a wide frequency range.

The schematic sectional drawing which shows the structure of the electromagnetic shielding laminated glass of this invention. The schematic sectional drawing of the edge part of electromagnetic shielding laminated glass. The schematic sectional drawing of the electromagnetic shielding glass of a multilayer glass structure which made the conductive member into 4 layers. The graph of the sound insulation grade line described in JIS A4706: 2000.

  The electromagnetic shielding laminated glass of the present invention is made of three glass plates (10, 11, 12) as shown in FIG. 1, and is composed of laminated glass (1). It is.

As the glass plate (10, 11, 12), an inorganic glass plate such as soda-lime-silica glass is used. In particular, float glass produced by a flow and method or tempered glass reinforced to float glass is used. Preferably used.

  For the glass plates (10, 11, 12), a flow and glass having a thickness of 3 mm or more and 20 mm or less used for construction are suitably used. In particular, a glass plate having a thickness of 3 to 10 mm is preferable for the glass plate (10, 12) used on the outside, and a glass plate having a thickness of 3 to 20 mm is preferable for the glass plate (11) used in the center. The glass plate (10, 12) is preferably a glass plate having a thickness of 5 to 10 mm, and the glass plate (11) used in the center is preferably a glass plate having a thickness of 6 to 15 mm.

  The glass plates (10, 11, 12) are integrated by the two-layer intermediate films 15, 16 to constitute a laminated glass (1).

  Furthermore, conductive films (41, 42) are formed on one side of the glass plates (10, 12), and the conductive films (41, 42) are positioned on the surface side of the laminated glass (1), not on the two-layer interlayer film side. Let

  Since the conductive film is provided on the outer surface instead of the mating surface, a highly durable tin oxide film (nesa film) formed by the CVD method is suitable for the conductive films (41, 42). When forming a tin oxide film on the surface of soda-lime-silica glass, it is preferable to form a barrier layer such as a silicon oxide film on the surface of the glass by a CVD method.

  In order to obtain high electromagnetic shielding performance, the sheet resistance value of the conductive films (41, 42) is preferably 30Ω / □ or less.

  The two-layer intermediate film 15 has a configuration in which a metal network 31 is inserted between two intermediate films 21 and 22, and the two-layer intermediate film 16 is a metal network body between two intermediate films 23 and 24. 32 is inserted.

  For the intermediate films 21, 22, 23, and 24, polyvinyl butyral (PVB) or ethylene vinyl acetate (EVA) is preferably used.

  In order to maintain transparency, the metal nets 31 and 32 preferably have an opening of 10 mm or more (50 mesh or more). In order to obtain high electromagnetic shielding performance, the opening of the mesh is 50 mm or less. It is desirable to set it to (150 mesh or less).

  Moreover, although it does not specify about the wire of the metal net bodies 31 and 32, metal conducting wires, such as iron, stainless steel, aluminum, and copper, can be used. Furthermore, the thing which gave the black dyeing oxide film for reflection prevention to the conducting wire of the previous period etc. can employ | adopt preferably.

  The diameter of the wire used for the metal net is preferably 50 μm or more from the viewpoint of ease of handling and 180 μm or less from the viewpoint of transparency.

  The metal net body 31 is folded over the end surface of the glass plate (10), and the metal net body 32 is folded over the end surface of the glass plate (12) to the surface of the laminated glass. The conductive film (41) or the conductive film (42) is preferably connected.

  It is preferable to provide the conductive tape 50 from the conductive film (41) to the conductive film (42) so as to cover the entire edge of the laminated glass from above the metal net body bent at the end face of the laminated glass.

Since all conduction of the metal nets 31 and 32 and the conductive films (41 and 42) is achieved by the conductive tape 50, a preferable electromagnetic wave shielding effect is obtained.

  The conductive tape 50 is formed by laminating a conductive adhesive containing carbon or the like on a metal foil such as copper, aluminum, SUS, or zinc, or by laminating an insulating adhesive having a hole in the metal foil. Things can be used.

  Furthermore, the electromagnetic shielding laminated glass of the present invention satisfies the T-4 grade of the sound insulation grade based on JIS A4706: 2000 by using a sound insulation intermediate film as the intermediate film.

  In the electromagnetic shielding laminated glass of the present invention, four interlayer films are used. At least two interlayer films out of the four interlayer films are sound-insulating interlayer films, so that sound insulation conforming to JIS A4706: 2000 is achieved. This is preferable because it satisfies the T-4 grade.

As the sound insulating interlayer, the following sound insulating interlayers (1) to (3) disclosed in Patent Documents 8, 9, and 10 can be used.
(1) The number of carbon atoms of the acetal group is 4 to 6, and the average value of the ethylene group amount to which the acetyl group is bonded is 8 to 30 mol% with respect to the total ethylene group amount of the main chain. At least one layer (A) composed of a polyvinyl acetal resin (A) and a plasticizer, an acetal group having 3 to 4 carbon atoms, and an average value of the amount of ethylene groups to which an acetyl group is bonded, A sound insulating interlayer comprising a polyvinyl acetal resin (B) having a mole fraction of 4 mol% or less with respect to the total ethylene group content of the main chain and at least one layer (B) made of a plasticizer.

  (2) A layer (A) having a thickness of 0.05 mm or more comprising a polyvinyl acetal resin and a plasticizer and a layer (B) comprising a polyvinyl acetal resin and a plasticizer are layer (B) / layer (A) / layer ( B), the polyvinyl acetal resin of the layer (A) was coacetalized with the aldehyde (a) having 6 to 8 carbon atoms and the aldehyde (b) having 2 to 4 carbon atoms. The weight ratio of the resin acetalized with the aldehyde (a) and the acetalized part with the aldehyde (b) is in the range of 60:40 to 100: 0, and the polyvinyl in the layer (B) The acetal resin is a resin in which polyvinyl alcohol is coacetalized with an aldehyde (b) having 2 to 4 carbon atoms and an aldehyde (a) having 6 to 8 carbon atoms. The polyvinyl acetal resin of at least one of the layer (A) and the layer (B), wherein the weight ratio of the tarlated portion and the portion acetalized with the aldehyde (a) is in the range of 80:20 to 100: 0. Is a co-acetalized resin, a sound insulating interlayer.

  (3) A sound insulating intermediate film in which a film containing hydrogenated styrene / isoprolene / butadiene block copolymer is laminated between ethylene-vinyl acetate films.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

Example 1
The electromagnetic shielding laminated glass of the laminated glass structure using the 3 glass plates shown in FIG. 1 was produced. The glass plate (11) was 12 mm thick float glass, and the glass plates (10, 12) were 6 mm thick float glass.

  As the two-layer intermediate film 15, a film in which a metal net 31 was sandwiched between two PVB films 21 and 22 having a thickness of 0.8 mm was used.

  As the metal net 31, a net having a mesh size of 100 mesh (aperture about 150 μm) made of stainless steel wire (thickness: about 50 μm) was used. The same two-layer intermediate film 16 as the two-layer intermediate film 15 was used.

  A tin oxide film (nesa film) was formed on the glass plates (10, 12) by a CVD method. The sheet resistance was 15Ω / □.

  The electromagnetic shielding performance of the electromagnetic shielding laminated glass produced in this example was measured in accordance with US Mill Standard MIL-STD 285 in the horizontal polarization and the vertical polarization. Got.

  The electromagnetic shielding performance did not fall below 70 dB, and showed very good shielding performance of 90 to 100 dB or more in most frequency ranges.

Comparative Example 1
An electromagnetic shielding glass (2) having a multilayer glass structure as shown in FIG. 3 was produced.

  Two metal nets (33, 34) are sandwiched between the intermediate film (25) and the intermediate film, and two sheets of a glass plate (13) having a thickness of 6 mm and a glass plate (14) having a thickness of 12 mm are obtained. Laminated glass (3) was produced using a glass plate.

  The same metal net as in Example 1 was used as the metal net (33, 34). Further, the same intermediate film as in Example 1 was used for the intermediate films (25, 26).

  Next, a laminated glass (3) and a glass plate (15) on which an Ag film (65) having a sheet resistance of 20Ω / □ is formed by a sputtering method, and a spacer 73 so that the air layer (16) is 12 mm. A double-layer glass (2) was used.

  Further, a plastic film with conductive film (63, 64) was provided on the outer glass surface of the multilayer glass 2. For the plastic films with conductive film (63, 64), a conductive film formed by laminating a SnO2 film, an Ag film, a SnO2 film, an Ag film, and a SnO2 film in this order on a polyethylene terephthalate film by sputtering. Was used. The sheet resistance value of the conductive film of the plastic film with conductive film (63, 64) was 2Ω / □. An acrylic adhesive was used for bonding the plastic films with conductive films (63, 64) to the laminated glass (3) and the glass plate (15).

  A laminated glass (13) and a glass plate (15) are arranged to face each other, a spacer (72) is inserted in the periphery of the glass plate, and the laminated glass (13) and the spacer (72) are also inserted into the glass plate (15 ) And spacer (72) are bonded with a maintenance primary sealant, and the peripheral part surrounded by laminated glass (13), glass plate (15) and spacer (72) is filled with secondary sealant did.

  A butyl rubber adhesive was used for the primary sealing material, and a silicone adhesive was used for the secondary sealing material.

  The metal net (33, 34) used for the production of the laminated glass (3) is larger than the glass plate, and the part of the metallic net (33, 34) protruding from the glass edge is made of metal. The net (33) folds the end of the glass plate (13) so as to straddle the end of the glass plate (13), and the metal net (34) wraps the end of the glass plate (14). It covered and it turned up so that the edge part of the glass plate (15) in which the Ag film | membrane was formed may be straddled.

  The end of the glass plate (15) is covered with the end of the glass plate (15) so that the metal net (34) and the Ag film formed on the glass plate (15) are electrically connected. A conductive tape (52) was provided so as to straddle.

Moreover, the conductive tape 51 is provided so as to straddle the entire end of the multilayer glass 2, and the conductive film of the metallic net (33, 34), the Ag film (65) and the plastic film with conductive film (63, 64) and Conducted continuity,
The electromagnetic shielding glass having a multilayer glass structure produced in Comparative Example 1 is composed of the conductive film of the plastic film with the conductive film, the double-layered metal net used for the laminated glass 2, and the Ag film of Example 1. The same four-layer conductor is provided.

  The electromagnetic shielding performance of Comparative Example 1 was measured in the same manner as in Example 1. The measurement results are shown in Table 1. The electromagnetic shielding performance of the comparative example was inferior to 20 dB or more in comparison with Example 1.

Example 2
Of the two two-layer interlayer films 15 and 16 of Example 1, all the same as in Example 1 except that the PVB films 21 and 22 of the two-layer interlayer film 15 are made of sound insulating interlayer films of the same thickness. An electromagnetic shielding laminated glass was produced.

Example 3
The PVB film 21 used for the two two-layer interlayer films 15 of Example 1 and 23 used for the two-layer interlayer film 16 are all sound-insulating interlayer films of the same thickness as Example 1 except that Similarly, an electromagnetic shielding laminated glass was produced.

  In order to evaluate the sound insulation performance of the electromagnetic shielding laminated glasses prepared in Examples 1 to 3, the transmission sound loss was measured according to JIS A1416: 2000, the sound insulation performance was evaluated according to JIS A 3207: 2000, and Table 2 The evaluation results shown were obtained.

10, 11, 12, 13, 14, 15 Glass plate 16 Air layer 21, 22, 23, 24, 25, 26 Intermediate film 31, 32, 33, 34 Metal net 41, 42 Conductive film 50, 51, 52 Conductive tape 63, 64 Plastic film with conductive film 65 Ag film 71 Secondary seal 72 Primary seal 73 Spacer

Claims (6)

  An electromagnetic shielding glass in which a metal net is inserted between glasses, the metal net is inserted between two intermediate films to form a two-layer intermediate film, and three glass plates (10, 11, 12) and two two-layer interlayer films (15, 16), glass plate (10), two-layer interlayer film (15), glass plate (11), two-layer interlayer film (16), glass In the order of the plate (12), a glass plate and a two-layer interlayer film are alternately laminated to form a laminated glass 1, and a conductive film (41, 42) is formed on the air side surface of the glass plate (10, 12) located outside. ) Is formed, an electromagnetic shielding glass.   The electromagnetic shielding glass according to claim 1, wherein a thickness of the glass plate 11 used in the center of the laminated glass 1 is 3 to 20 mm.   The electromagnetic shielding glass according to claim 1 or 2, wherein the glass (10, 12) used on the outside of the laminated glass 1 has a thickness of 3 to 10 mm.   The electromagnetic shielding glass according to claim 1, wherein the conductive films (41, 42) are made of tin oxide.   5. The electromagnetic shielding glass according to claim 1, wherein the metal nets 31 and 32 are 50 to 150 mesh.   The sound insulation grade according to JIS A4706: 2000 is a T-4 grade, wherein a sound insulation interlayer is used for at least two of the four intermediate membranes. The electromagnetic shielding laminated glass according to any one of the above.

Images