JP5245316B2 - Manufacturing method of plastic film-inserted laminated glass - Google Patents

Description

  The present invention relates to a laminated glass produced by laminating a glass plate, an intermediate film, a transparent plastic film, an intermediate film, and a glass plate in this order.

  A laminate of two glass plates using two intermediate films sandwiched with a plastic film, particularly a polyethylene terephthalate film, is known as a laminated glass having a heat ray reflecting function.

  Usually, laminated glass is subjected to high-temperature and high-pressure treatment using an autoclay unit, and a glass plate and a polyester film are heat-sealed by an intermediate film.

  For example, in Patent Document 1, a flexible laminate in which a heat ray reflective plastic film having a thin film formed on a polyester film is sandwiched between two intermediate films is sandwiched between two glass plates and laminated. Glass is disclosed.

    Further, Patent Document 2 includes a near-infrared shielding film composed of a multilayer plastic layer sandwiched between two polyvinyl chloride sheets, and further laminated between two sheets of glass. It is disclosed. Moreover, this near-infrared shielding film is a film in the film forming direction and the width direction at 150 ° C. for 30 minutes from the viewpoint of preventing peeling or cracking between the glass and the film after being attached to the glass. It is described that both shrinkage rates are 2% or less and that the difference in shrinkage rate at 150 ° C. for 30 minutes is 0.5% or less from the viewpoint of preventing wrinkles.

  Furthermore, Patent Document 3 describes the functionality having selective light permeability and conductivity as a means for preventing defects such as wrinkles when a polyethylene terephthalate film is sandwiched between two PVB films and laminated on laminated glass. In order to prevent appearance defects such as wrinkles when the film is sandwiched between polyvinyl butyral films and made into laminated glass, the thermal expansion ratio of one of the polyester terephthalates used for the functional film is 0.1 to 1.0%. It is described that the thermal shrinkage rate in the orthogonal direction is 0.1 to 1.0%.

Patent Document 4 uses a heat ray reflective film in which a film of indium oxide or silver is formed on a plastic film, and has a thermal shrinkage ratio of 1 to 20% when a plastic film is heat-processed to produce a laminated glass. The use is described.
JP-A-56-32352 Republished 2005-40868 JP-A-60-225747 JP-A-6-270318

  When a transparent plastic film is sandwiched between interlayer films and inserted between two glass plates to produce a laminated glass, the entire surface of the plastic film inserted into the laminated glass is wrinkled, resulting in an appearance defect. Problems arise.

  This invention makes it a subject to provide the laminated glass which inserted the transparent plastic film without such an external appearance defect.

The present invention is made by laminating a glass plate, an intermediate film, a plastic film, an intermediate film, and a glass plate in this order, sandwiching the plastic film with the intermediate film, and pressurizing and degassing at 90 to 150 ° C. in an autoclave. A method for producing a laminated glass for a plastic windshield for an automobile windshield having a visible light transmittance of 70% or more as defined in JIS R3211-1998 by thermally fusing a plate and a plastic film with an intermediate film, the glass plate Is a glass plate that has been bent , and the plastic film is made by a stretching method, has a thickness of 50 μm to 200 μm, and a tensile force of 10 N is applied per 1 m width of the plastic film in the temperature range of 90 to 150 ° C. plastic films time, elongation of the plastic film is not more than 0.19% By using a method for manufacturing a windscreen plastic film-inserted laminated glass of an automobile wrinkle-like appearance defects in the whole surface of the glass is characterized by preventing the occurrence fit when heat sealing.

The present invention also provides the plastic film-inserted laminated glass, plastic film, characterized in that it is a plastic film obtained by laminating a hard coat layer on one or both sides.

In the plastic film-inserted laminated glass, the present invention is characterized in that an infrared reflecting film is formed on one side of the plastic film.

  In a laminated glass produced by sandwiching a plastic film between two intermediate films, it is possible to provide a plastic film-inserted laminated glass that is free from wrinkles in the plastic film and is practical.

  As shown in FIG. 1, the plastic-inserted laminated glass of the present invention has a structure in which a plastic film 12 sandwiched between intermediate films 11 and 13 is inserted between two glass plates 10 and 14.

  In the plastic-inserted laminated glass of the present invention, two glass plates 10 and 14 and a plastic film 12 are firmly integrated by intermediate films 11 and 13.

  For the glass plates 10 and 14, it is easy to use soda lime glass by a float method obtained at low cost.

  A hot melt type adhesive such as polyvinyl butyral (PVB) or ethylene vinyl acetate (EVA) is preferably used for the intermediate films 11 and 13.

  Since plastic film becomes more flexible at high temperatures, it is sandwiched between interlayer films, and when the laminated glass is made at high temperature and high pressure by an autoclave and heat-sealed by the interlayer film, the plastic film is wrinkled. It becomes easy.

  In a high-temperature and high-pressure treatment by an autoclave, a high temperature state of 90 to 150 ° C is obtained.

In order to prevent the plastic film from wrinkling even at such a temperature, the tensile strength of the plastic film is 10 N per 1 m width at a high temperature range of 90 to 150 ° C. When is added, the elongation is preferably 0.19% or less.
The tensile force of 10N applied per 1m width of the plastic film is such that when the plastic film sandwiched between the intermediate films is made high temperature and high pressure by an autoclave and the plastic film and the glass plate are thermally fused by the intermediate film, the plastic film This corresponds to the tensile force that is generated to cause the plastic film to stretch.

  The elongation percentage of the plastic film is measured by the following procedures 1 to 5.

  Procedure 1 A plastic film is cut into a length of 15 mm and a width of 5 mm to obtain a measurement sample. Fixing jigs are attached to both ends of the measurement sample, and the length of exposure of the measurement sample between the fixing jigs at both ends is set to 10 mm.

  Procedure 2 A tensile force of 10 N is applied to the measurement sample per 1 m width of the plastic film. In the case of the measurement sample shown in Procedure 1, a load of 0.05 N is applied.

Procedure 3 Measure the length L ₀ of the measurement sample between the fixing jigs.

  Procedure 4 Heat to a predetermined measurement temperature between 90 and 150 ° C. at 5 ° C./min, and measure the length L between the fixing jigs of the measurement sample at the measurement temperature.

Procedure 5 Elongation rate (%) is calculated by (L ₀ -L) / L × 100.

  In order to use the plastic film-inserted laminated glass of the present invention as a window member for buildings or automobiles, it is preferable to use a plastic film having transparency. As the plastic film, a polyethylene terephthalate (PET) film or a polyethylene naphthalate film is used. Polyester film, polyimide film, tack film, nylon film, polycarbonate film, polymethyl methacrylate, polyether sulfone, polyarylate, cycloolefin polymer and the like can be suitably used.

  In addition, the plastic film produced by the stretching method such as PET film has relatively high strength, so it can suppress defects such as film breakage caused by handling during the laminating process. This is preferable because it can also suppress the generation of white turbidity.

  A plastic film having a hard coat layer laminated on the surface can also be suitably used. Depending on the plastic film, the adhesiveness with the intermediate film may be poor, or when an infrared reflective film is formed, white turbidity may occur. By forming a hard coat layer, these problems can be solved. Moreover, it is also possible to suppress the elongation of the plastic film by forming a hard coat layer.

  The hard coat layer may be laminated on both sides of the plastic film or on only one side.

  Although the thickness of the plastic film is less than 40 μm, it is difficult to handle the film, and when an infrared reflecting film is formed, the film tends to curl due to the stress of the infrared reflecting film. On the other hand, when the thickness of the film is greater than 200 μm, an appearance defect due to poor deaeration occurs at the time of bonding, so the thickness is desirably 50 μm to 200 μm.

  As the metal film for forming the infrared reflective film, a metal film formed using a metal such as Au, Ag, Cu, or Al can be used.

  In addition, as shown in FIG. 2, for example, as shown in FIG. 2, the infrared reflective film made of a dielectric multilayer film is refracted into even-numbered dielectric films 22 and odd-numbered dielectric films 23. An infrared reflecting film 21 using a different dielectric is used.

As the dielectric film, a dielectric film having an appropriate refractive index selected from dielectrics of TiO ₂ , Nb ₂ O ₅ , Ta ₂ O ₅ , SiO ₂ , Al ₂ O ₃ , ZrO ₂ , and MgF ₂ may be used. preferable.

  Further, when the number of laminated dielectric films is 3 or less, reflection in the near-infrared region is insufficient, and when the number of layers exceeds 12, the production cost increases. Increases the film stress, resulting in poor adhesion of the dielectric film and curling of the film, so that the total number of laminated dielectric films may be 4 or more and 11 or less. Is preferred. As the number of layers increases, the maximum value of reflection in the near-infrared region increases, and the color in the visible light region becomes nearly colorless, and a preferable infrared reflection film is obtained.

  Further, the infrared reflecting film 21 formed of a dielectric multilayer film is an infrared reflecting film having a maximum value of reflection exceeding 50% in the wavelength region of 1200 nm to 1400 nm, so that the transmission side due to radiation from the incident side is made. Intrusion of heat can be suppressed, and the reflectance at a wavelength of 2000 nm or more is less than 50%, and various radio waves used for communication can be transmitted.

  Moreover, the plastic insertion laminated glass produced using the plastic film in which the infrared reflective film 21 was formed is excellent in transparency by setting the visible light transmittance defined in JIS R3211-1998 to 70% or more. It can be suitably used for a windshield of an automobile.

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

Example 1
A plastic insertion laminated glass 1 shown in FIG. 1 was produced. As the glass plates 10 and 14, glass plates made of soda lime glass by a float method having a thickness of 300 mm × 300 mm and a thickness of 2 mm were used.

  As the plastic film 12, a PET film (thickness: 100 μm) was used. The elongation of the PET film measured at a measurement temperature of 150 ° C. and a tensile force of 10 N per 1 m of the film width was 0.02% in the MD direction and 0.13% in the TD direction. It was.

  The elongation percentage was measured according to procedures 1 to 5 using a Rigaku thermomechanical analyzer (PTC10A).

  In addition, as the intermediate films 11 and 13, hot melt adhesive films made of PVB having a thickness of 0.38 mm were used.

  After the glass plate 10, the intermediate film 11, the plastic film 12, the intermediate film 13, and the glass plate 14 are sequentially stacked, and the excess portions of the intermediate film 11, the plastic film 12, and the intermediate film 13 that protrude from the edge of the glass are cut and removed. Then, heating was performed at 150 ° C. for 30 minutes in an autoclave, and delamination was performed by pressure degassing to produce a plastic-inserted laminated glass 1.

  The produced plastic-inserted laminated glass 1 was a plastic-inserted laminated glass having no appearance of wrinkle-like appearance on the plastic film 12 and having a good appearance.

Example 2
The glass plates 10 ′ and 14 ′ were all the same as in Example 1 except that a glass plate made of soda lime glass by a float method with a thickness of 2 mm and a radius of curvature of 1200 mm was used. A plastic insertion laminated glass 2 shown in FIG. 2 was produced.

  In the produced plastic-inserted laminated glass, similarly to Example 1, the plastic-inserted laminated glass 2 having no appearance of wrinkle-like appearance on the plastic film 12 and good appearance was obtained.

Example 3
As the glass plates 10 and 14, glass plates made of soda lime glass by the float method, which are 300 mm × 300 mm and have a thickness of 2 mm, as in Example 1 were used.

  A plastic film 12 ′ in which the infrared reflecting film 21 shown in FIG. 3 is formed on a PET film 20 having a thickness of 50 μm was used.

An acrylic hard coat layer (not shown) was laminated on both sides of the PET film 20 to a thickness of 5 μm. Further, the infrared reflection film 21 uses an Nb ₂ O ₅ film for the dielectric film 22, an SiO ₂ film for the dielectric film 23, and a Nb ₂ O ₅ film on one side of the PET film 20 on which a hard coat layer is formed. (Thickness 115 nm), SiO ₂ film (thickness 175 nm), Nb ₂ O ₅ film (thickness 115 nm), SiO ₂ film (thickness 175 nm), Nb ₂ O ₅ film (thickness 115 nm), SiO ₂ film ( And a Nb ₂ O ₅ film (thickness 115 nm) were sequentially formed by sputtering.

  The elongation rate at 150 ° C. of the plastic film 12 ′ formed with the hard coat film and the infrared reflective film 21 (with a tensile force of 10 N per 1 m of the film width) is 0.01% in the MD direction. Hereinafter, it was 0.19% in the TD direction.

  As the plastic film 12 ', using this infrared reflective film and a film with a hard coat film, the glass plate 10, the intermediate film 11, the plastic film 12', the intermediate film 13, and the glass plate 14 are sequentially stacked in the same manner as in Example 1. While heating at 150 ° C. for 30 minutes in an autoclave, pressure deaeration was performed to perform laminating processing to produce a plastic-inserted laminated glass.

  In the produced plastic-inserted laminated glass, a plastic-inserted laminated glass having a good appearance without a wrinkle-like appearance defect in the plastic film 12 'was obtained.

Comparative Example 1
A plastic-inserted laminated glass 1 shown in FIG. 1 was produced in the same manner as in Example 1 except that a PET film (thickness: 100 μm) having an elongation rate of 0.3% at 150 ° C. was used as the plastic film 12. did.

  Wrinkled appearance defects occurred on the entire surface of the produced plastic-inserted laminated glass 1.

Comparative Example 2
A plastic-inserted laminated glass 2 shown in FIG. 3 was produced in the same manner as in Example 2 except that a PET film (thickness: 100 μm) with an elongation rate of 0.3% at 150 ° C. was used as the plastic film 12. did.

  Similar to Comparative Example 1, wrinkled appearance defects occurred on the entire surface of the produced plastic-inserted laminated glass 2.

Sectional drawing which shows the structure of the plastic film insertion laminated glass of this invention. Sectional drawing which shows the structure of the plastic film insertion laminated glass produced in Example 2 and Comparative Example 2. FIG. Sectional drawing of a plastic film which shows the structure of the infrared reflective film obtained by laminating | stacking a dielectric material film.

Explanation of symbols

10, 10 'glass plate 11 intermediate film 12, 12' plastic film 13 intermediate film 14, 14 'glass plate 20 PET film 21 infrared reflection film 22 odd-numbered dielectric film 23 even-numbered dielectric film

Claims (3)

A glass plate, an intermediate film, a plastic film, an intermediate film, and a glass plate are laminated in this order, and the glass film and the plastic film are sandwiched by the intermediate film and depressurized at 90 to 150 ° C. in an autoclave. In the method of manufacturing a plastic film-inserted laminated glass for an automotive windshield having a visible light transmittance of 70% or more as defined in JIS R3211-1998
The glass plate is a bent glass plate,
When the tensile force of 10 N is applied per 1 m width of the plastic film in the temperature range of 90 to 150 ° C., the thickness is 50 μm to 200 μm, which is produced by the stretching method as the plastic film. By using a plastic film of 0.19 % or less, wrinkle-like appearance defects are prevented from occurring on the entire surface of the laminated glass when heat-sealing, and a plastic film for a windshield of an automobile A method for producing an insert laminated glass. 2. The method for producing a plastic film-inserted laminated glass according to claim 1, wherein the plastic film has a hard coat layer laminated on both sides or one side. 3. The method for producing a plastic film-inserted laminated glass according to claim 1, wherein the plastic film is a plastic film having an infrared reflection film formed on one side.

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