JP6141661B2 - Insulation sheet for window glass - Google Patents

Description

  The present invention relates to a heat insulating sheet for a window glass that suppresses heat transfer between the room and the outside by being attached to the window glass, and more specifically, for a window glass that blocks ultraviolet rays and infrared rays irradiated from the outside toward the room. It relates to an insulation sheet.

  When the temperature difference between the room and the outdoor is large, such as in summer or winter, heat easily moves between the room and the outdoor using the temperature gradient as a driving force. In particular, most of the heat transfer in the residence is done from the window glass. Therefore, a heat insulating sheet for window glass for reducing heat transfer from the window glass is provided.

  For example, as described in Patent Document 1, this heat insulating sheet includes a base sheet having an air heat insulating layer (cap layer) inside, and sprays water on one surface of the base sheet to attach it to the window glass. Thus, heat transfer from the window glass can be suppressed (insulated).

  In Patent Document 1, an ultraviolet absorbing sheet in which an ultraviolet absorbing material is kneaded is integrally bonded to the other surface of the base sheet in order to reduce the amount of ultraviolet rays irradiated into the room. According to this, an ultraviolet-ray can be absorbed from the sunlight component which permeate | transmits a window glass.

  However, when trying to increase the UV absorption rate of the UV absorbing sheet to almost 100%, a large amount of UV absorbing material must be added to the plastic resin that is the base material of the UV absorbing sheet. The thickness becomes thick.

  Furthermore, when the UV-absorbing sheet is bonded to the base sheet by thermal lamination, the UV-absorbing sheet (PET) and the base sheet (PE) are dissimilar materials. End up. For this reason, not only is it difficult to apply water, but also the four corners of the heat insulating sheet rise after application of water, which is not preferable.

Japanese Patent Laid-Open No. 11-348169

  Then, in order to solve the subject mentioned above, this invention is providing the heat insulation sheet | seat for windowpanes which can be affixed stably over a long period of time, without producing a curl etc.

In order to solve the above-described problems, the present invention has several features described below. That is, in a heat insulating sheet for window glass, which has a base sheet having an air heat insulating layer inside, and an ultraviolet absorbing sheet having ultraviolet absorbing properties is bonded to one surface of the base sheet, The other surface has a water sticking property that allows water to be attached to the window glass, and the ultraviolet absorbing sheet is composed of two protective films not containing the ultraviolet absorbing material, and an adhesive layer to which the ultraviolet absorbing material is added. It is characterized by being joined to form a single sheet body.

  The ultraviolet absorbing sheet is characterized in that it is integrally bonded to the base sheet by thermal lamination.

  An aluminum vapor deposition film that shields infrared light is provided on one inner surface of the protective film.

  According to this, two protective films not containing an ultraviolet absorber were formed into a single sheet body by an adhesive layer to which an ultraviolet absorber was added, and the ultraviolet absorber was heat laminated to a base sheet. As a result, a thin ultraviolet-absorbing sheet having a high ultraviolet absorption rate can be obtained, and a heat-insulating sheet can be obtained that is less likely to curl and can be stably adhered over a long period of time.

The principal part sectional view of the heat insulation sheet for windowpanes concerning one embodiment of the present invention.

  Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

  As shown in FIG. 1, this heat insulating sheet for window glass 1 includes a base sheet 2 having an air heat insulating layer 21 inside, and an ultraviolet ray integrally bonded to one surface (the upper surface in FIG. 1) of the base sheet 2. An absorbent sheet 3 is provided.

  The base sheet 2 includes a partition film 22 having irregularities formed thereon, and an outer film 23 and an inner film 24 that are integrally bonded so as to sandwich both surfaces of the partition film 22, and these are integrally formed. .

  In this embodiment, the partition film 22 is made of a polyethylene film, and a so-called air cap film in which cylindrical projections are arranged in a staggered manner with a predetermined interval is used. Both sides of the partition film 22 are an outer film 23 and an inner film 24. The base sheet 2 having the air heat insulating layer 21 is formed by sandwiching and integrating.

  The outer film 23 is a synthetic resin film, and one surface (the upper surface in FIG. 1) is integrally attached to the partition film 22 by thermal lamination. In this embodiment, the other surface (the lower surface in FIG. 1) of the outer film 23 has a water sticking property capable of water sticking the outer film 23 to a window glass (not shown). In addition, you may join using an adhesive or an adhesive instead of a heat laminate.

  In this embodiment, the outer film 23 is made of a polyolefin resin. Thereby, the hydrophilicity of the outer film 23 is improved, and so-called water pasting, in which water is applied to the surface of the outer film 23 and pasted on the window glass, becomes possible. In addition, water may be apply | coated to a window glass and the outer film 23 may be bonded together there.

  In addition to this, in order to give the outer film 23 a water sticking property, for example, the surface of the outer film 23 may be subjected to corona discharge machining to form a microvoid to further improve the water sticking property.

  A synthetic resin film is used for the inner film 24, and one surface (the lower surface in FIG. 1) is attached to the partition film 22 by thermal lamination. The ultraviolet absorbing sheet 3 is integrally bonded to the other surface (the upper surface in FIG. 1) of the inner film 24. In addition, you may join using an adhesive or an adhesive instead of a heat laminate.

  The ultraviolet absorbing sheet 3 is composed of two protective films 31 and 32 bonded together with an adhesive layer 33, and a predetermined ultraviolet absorbing material is blended in the adhesive layer 33.

  In this embodiment, one (upper side in FIG. 1) protective film 31 is a scratch-resistant PET (polyethylene terephthalate) film, and the other (lower side in FIG. 1) protective film 32 is a base sheet. PE (polyethylene) film is used in consideration of the bonding property to No.2.

  The pressure-sensitive adhesive layer 33 uses a polyester-based urethane pressure-sensitive adhesive, and a predetermined amount of an ultraviolet absorber is blended therein. In this embodiment, a polyester-based urethane pressure-sensitive adhesive is used for the pressure-sensitive adhesive layer 33, but other acrylic-based, rubber-based, and silicon-based pressure-sensitive adhesives and adhesives may be used. For more specific explanation about urethane adhesives, see (Urethane adhesives) in Chapter 2. 2.3.5 of “Adhesion Handbook (3rd edition)” issued by Japan Adhesive Tape Industry Association in 2005. Refer item.

  An ultraviolet absorber is blended in an amount of 10 wt% with respect to this adhesive. As UV absorbers, benzophenone, benzotriazole, salicylate, and cyanoacrylate UV absorbers that absorb harmful UV rays and prevent the formation of free radicals are used. It may be used as long as an ultraviolet absorbing material in an amount capable of absorbing 99% or more of ultraviolet rays from the light transmitted through the pressure-sensitive adhesive layer 33 is blended. For more specific UV absorbers, please refer to the items in Chapter 2 and Section C (Light Stabilizer) of “Practical Plastic Dictionary” published by Industrial Research Co., Ltd., 1993.

According to this, by blending the ultraviolet absorber in the pressure-sensitive adhesive layer 33, not only can the overall thickness be formed thinner than when added to the film, but also the protective film via the pressure-sensitive adhesive layer 33. Since 31 and 32 are bonded together, a dimensional change can be made as small as possible.

  The ultraviolet absorbing sheet 3 is integrally bonded to the inner film 24 of the base sheet 2 by heat lamination. According to this, since the protective sheet 32 of the ultraviolet absorbing sheet 3 and the inner film 24 of the base sheet 2 are both made of polyethylene, curling that occurs at the four corners of the sheet due to the difference in expansion and contraction when thermally laminated is achieved. It can be suppressed and can be stably attached to the window glass for a long period of time.

  One protective film (PET film) 31 is formed with an aluminum vapor deposition film 34 for shielding infrared rays. The aluminum vapor deposition film 34 is a thin film formed on the surface of the protective film 31 by sputtering or the like, and is formed on the surface facing the pressure-sensitive adhesive layer 33 in this example. The specific formation method, thickness, and the like of the aluminum vapor deposition film 34 may be arbitrarily changed according to specifications.

  In this example, the aluminum vapor deposition film 34 is provided on the one protective film 31 side, but may be provided on the other protective film 32 side. Furthermore, it may be provided on both protective films 31 and 32.

DESCRIPTION OF SYMBOLS 1 Heat insulating sheet for window glass 2 Base sheet 3 Ultraviolet absorption sheet 31 and 21 Protective film 33 Adhesive layer 34 Aluminum vapor deposition film

Claims (3)

In the heat insulating sheet for window glass, which has a base sheet having an air heat insulating layer inside, and one surface of the base sheet is bonded with an ultraviolet absorbing sheet having ultraviolet absorbing property,
While the other surface of the base sheet has a water sticking property that allows water sticking to the window glass,
The above-mentioned ultraviolet absorbing sheet is a window glass comprising two protective films not containing an ultraviolet absorbing material joined together by an adhesive layer to which an ultraviolet absorbing material is added so as to form a single sheet body. Thermal insulation sheet.   The heat insulating sheet for window glass according to claim 1, wherein the ultraviolet absorbing sheet is integrally bonded to the base sheet by thermal lamination. The heat insulating sheet for window glass according to claim 1, wherein an aluminum vapor deposition film that shields infrared light is provided on one inner surface of the protective film.

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