JP2816582B2 - Heat ray absorbing plate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat ray absorbing plate made of a thermoplastic resin suitable for various lighting applications such as a lighting dome and a roof material.

[Conventional technology]

Recently, polyethylene terephthalate film on which aluminum has been deposited (hereinafter referred to as aluminum deposited film)
There is a tendency for more and more buildings to reduce the rise in indoor temperature by using a window glass to which is adhered with an adhesive to reflect heat rays (near infrared rays) from the outside with an aluminum vapor-deposited layer.

[Problems to be solved by the invention]

However, the window glass or the like to which the aluminum vapor-deposited film is attached as described above reflects not only the heat rays but also the visible light with the aluminum vapor-deposited layer. There were drawbacks.

In addition, the work of attaching an aluminum-deposited film to glass with an adhesive is extremely troublesome, and there is a problem that it cannot be attached to glass having a curved surface, and air is easily mixed between the aluminum-deposited film and the glass. For,
There were also problems such as "bubble blistering" and a decrease in adhesive strength and easy peeling.

In addition, there has been a problem that a product obtained by attaching an aluminum vapor-deposited film to glass cannot be formed into a desired shape by a method such as press molding.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat absorbing plate which has both a good heat absorbing function and a lighting function, is easy to manufacture, and can be formed into a desired shape. It is in.

[Means for solving the problem]

In order to achieve the above object, the heat ray absorbing plate of the present invention has a translucent thermoplastic resin substrate, in which an aminium-based infrared absorbent is contained at a content of 0.03 to 0.12 mg / cm ^{2 on} the surface of the thermoplastic resin substrate. The present invention is characterized in that an acrylic resin surface layer having optical properties is integrated.

(Operation)

In the heat ray absorbing plate of the present invention, both the thermoplastic resin substrate and the acrylic resin surface layer have a good light-transmitting function because both have a light-transmitting property, and the acrylic resin surface layer has 0.03 to
Heat rays (near infrared rays) are almost absorbed by the aminium-based infrared absorber contained at a content of 0.12 mg / cm ² . In addition, the heat ray absorbing plate of the present invention, since both the substrate and the surface layer are made of thermoplastic resin, can be easily manufactured without laminating by laminating means such as thermocompression bonding without including bubbles.
Further, it can be formed into a desired shape by means such as thermoforming.

〔Example〕

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

FIG. 1 is a schematic cross-sectional view of a heat ray absorbing plate according to one embodiment of the present invention, wherein 1 is a thermoplastic resin substrate having a light transmitting property (hereinafter, referred to as a substrate) and 2 is laminated on the surface thereof. 1 shows an integrated acrylic resin surface layer having a light-transmitting property (hereinafter referred to as a surface layer), and the surface layer 2 contains an infrared absorbent 3.

As the substrate 1 described above, for example, a thickness 1 having good translucency is used.
A polycarbonate resin plate of about 10 mm, preferably about 2 to 5 mm is used. In addition, various transparent thermoplastic resin plates such as an acrylic resin plate and a polyvinyl chloride resin plate are of course also used.

As the surface layer 2, an acrylic resin (MMA) film having a thickness of 30 to 300 μm, preferably about 50 to 100 μm, in which the infrared absorber 3 is uniformly contained, is suitably used. Such an acrylic resin film has a low film formation temperature of about 150 to 200 ° C., so that even when the thermal decomposition temperature of the infrared absorbent 3 is low, film formation can be performed with almost no decomposition, and other heat It has good compatibility with a plastic resin, so that it can be firmly laminated to a substrate 1 made of polycarbonate or the like by means of thermocompression bonding or the like, and has such advantages that it does not easily deteriorate due to good weather resistance. Because it has.

In place of the acrylic resin film, the surface layer 2 may be formed by printing or coating an acrylic resin ink containing an infrared absorbent, a paint, or the like on the substrate 1 to a thickness of 3 to 50 μm, preferably 3 to 20 μm. it can.

As the infrared absorbing agent 3 contained in the surface layer 2, an aminium-based compound having a wide effective absorption band in the near infrared region (for example, an infrared absorbing agent described in JP-B-43-25335) is preferably used. . The concentration of the infrared absorbing agent 3 is suitably in the range of about 0.2 to 2%, and particularly when the thickness of the surface layer 2 is 50 to 100 μm, it is preferable to contain the infrared absorbing agent in the amount of about 1.0 to 0.5%. When the thickness is less than 50 μm, the content concentration is preferably 1.0% or more, and when the thickness is more than 100 μm, the content concentration is preferably 0.5% or less. That is, the amount of infrared absorption per unit area of the surface layer 2 is determined by the amount of the infrared absorber 3 contained in the unit area. Therefore, when the thickness of the surface layer 2 is reduced, the infrared absorber 3 does not run short. It is necessary to increase the content as described above, and conversely, when the thickness of the surface layer 2 is increased, the content can be reduced.

The preferred amount of the infrared absorber per unit area (1 cm ² ) of the surface layer 2 varies depending on the type of the infrared absorber 3, but is about 0.03 to 0.12 mg for the above-mentioned aminium compound,
Within this range, an excellent infrared absorbing effect is exhibited.

Since the infrared absorber 3 of the aminium-based compound is inferior in weather resistance, there is a concern that early addition of the infrared absorber 3 to the surface layer 2 may cause early deterioration. Therefore, it is desirable that the ultraviolet ray is absorbed by including the ultraviolet ray absorbent in the surface layer 2 together with the infrared ray absorbent 3 to prevent the infrared ray absorbent 3 from being deteriorated. As the ultraviolet absorber, for example, known ones such as benzotriazoles are suitably used, and the content thereof is about 0.2 to 2.0%, preferably about 0.5 to 1.0%.

If necessary, a suitable amount of a coloring agent may be added to the substrate 1 or the surface layer 2 so that the substrate 1 or the surface layer 2 is colored to a desired color without impairing the translucency. In addition, the infrared absorbing agent 3 of an aminium compound
When the surface layer 2 is contained in the surface layer 2, the surface layer 2 is colored pale yellow-green by the infrared absorbing agent 3 without blending a coloring agent. Become.

The heat ray absorbing plate having the above structure is formed by using a film forming machine to form a film of an acrylic resin in which a predetermined amount of an infrared absorber and an ultraviolet absorber and the like are uniformly mixed as necessary. It can be easily manufactured by stacking and thermocompression bonding on the thermoplastic resin substrate 1.

In the heat ray absorbing plate of this embodiment, as described above, since both the substrate 1 and the surface layer 2 have translucency, a good light-collecting function can be exhibited, and the infrared absorbing agent 3 is added to the surface layer 2. Since it is contained, heat rays (near infrared rays) can be almost absorbed by the infrared absorbent 3. Therefore, if this heat ray absorbing plate is used instead of, for example, a window glass, it is possible to absorb a heat ray while keeping the room bright and prevent a rise in the temperature inside the room. Further, in this heat ray absorbing plate, since both the substrate 1 and the surface layer 2 are made of a thermoplastic resin, as described above, the surface layer 2 is integrated with the substrate 1 in a close contact state by laminating means such as thermocompression bonding or coating means. It can be manufactured easily and "bubble blisters" like a conventional aluminum vapor-deposited film attached with an adhesive
There is no fear of causing a decrease in the adhesive strength or the like, and if thermoforming or the like is further performed, various daylighting materials having a desired shape such as a daylighting dome and a daylighting roof panel can be easily obtained.

In particular, when the surface layer 2 is made of an acrylic resin film containing the infrared absorbent 3 as in this heat ray absorbing plate, the acrylic resin has a film forming temperature of about 160 ° C. by adjusting the copolymer composition. Since a low film can be obtained, the infrared absorbing agent hardly decomposes at the time of film formation, and furthermore, the film is firmly laminated to the substrate 1 such as polycarbonate under mild heating and pressurizing conditions. There is an advantage that a heat ray absorbing plate having a large peel strength can be obtained. In addition, since such an acrylic resin film has excellent weather resistance, the heat ray absorbing plate having the surface layer 2 formed from the film has good durability, and further contains an ultraviolet absorber to absorb ultraviolet rays. The heat ray absorbing plate that is made to perform the process hardly causes deterioration of the infrared absorbent 3 due to ultraviolet rays, and thus has an advantage that excellent heat ray absorbing performance can be maintained for a long period of time.

FIG. 2 is a cross-sectional view showing another embodiment of the heat ray absorbing plate of the present invention. This heat ray absorbing plate has a surface layer 2 containing an aminium-based infrared absorbing agent 3 laminated on the surface of a substrate 1. Further, a surface coating layer 4 made of a thermoplastic resin having excellent weather resistance such as an acrylic resin is integrated on the surface thereof by means including coating. This surface coating layer 4
The thickness is suitably about 3 to 300 μm and about 3 to 100 μm. It may be thicker or thinner than this. Note that the substrate 1 and the surface layer 2 are the same as those in the above-described embodiment, and a description thereof will be omitted.

When the surface coating layer 4 is laminated as described above, there is an advantage that the weather resistance and durability of the heat ray absorbing plate are further improved. It should be noted that an ultraviolet absorber is added to the coating layer 4 so that the surface layer 2
It is also effective to protect the infrared absorbent from decomposition.

FIG. 3 is a graph showing the total light transmittance of a polycarbonate resin plate (hereinafter, referred to as a PC plate) and the heat ray absorbing plate of the present invention. That is, curve A shows the total light transmittance of test piece A of a 3 mm thick PC plate injection-molded at 290 ° C., and curve B contains 1% by weight of an infrared absorber (aminium-based compound). The total light transmittance of the test piece B of the heat ray absorbing plate in which an acrylic resin film having a thickness of 100 μm is laminated and integrated on the surface of the PC plate is shown, and a curve C is a 1% by weight infrared absorbing agent (aminium type). Compound) and a 100-μm-thick acrylic resin film containing 1% by weight of an ultraviolet absorber, laminated on the surface of the PC plate, and shows the total light transmittance of a test piece C of a heat ray absorbing plate. Curve D shows a 100 μm thick acrylic resin film containing 1% by weight of an infrared absorber (aminium-based compound), 1% by weight of an ultraviolet absorber, and 0.17% by weight of a carbazole-based pigment laminated on the surface of the PC board. Integrated heat absorption Shows the total light transmittance of the test piece D of the plate.

According to this graph, the test piece A of the PC plate transmits both visible light and near infrared light well, whereas the test pieces B, C, and D of the heat ray absorbing plate of the present invention show light transmittance in the near infrared region. Is about 15% or less, indicating that near infrared rays are efficiently absorbed by the infrared absorbent contained in the surface layer of the acrylic resin film.

The results of the heat insulation test performed on the test pieces C and D of the heat ray absorbing plate of the present invention and the test piece A of the PC plate are shown in the following table.

This heat insulation test was carried out using a measuring device as shown in FIG. 5 in the following manner. That is, the test piece 7 is placed so as to cover the upper wall opening 6 of the air-permeable box 5 having a ventilation hole in the side wall, and about 4 to 4.5 cm above the test piece.
The test piece 7 is illuminated by a 60 W incandescent lamp 8 arranged at an interval of 9 mm, and a heat absorbing plate (black copper plate on both sides) 9 placed inside the box 5 at an interval of 17 cm from the test piece 7
The heat ray transmitted through the test piece 7 was absorbed by the test piece, and the temperature of the heat absorbing plate 9 was measured with the radiation thermometer 10 with time.

According to the above table, the test pieces C and D of the heat ray absorbing plate of the present invention suppress the temperature rise by about 8 ° C. as compared with the test piece A of the PC plate at the time when 7 minutes have elapsed, and exhibit a good heat insulating effect. You can see that.

As is clear from the above test results, the heat ray absorbing plate of the present invention is such that the infrared ray absorbing agent 3 contained in the surface layer 2 almost absorbs the heat ray and exhibits a good heat insulating effect. Even if the absorber 3 is contained in the substrate 1 such as a polycarbonate resin plate to produce a heat ray absorbing plate having a single layer structure, it is difficult to expect a satisfactory effect. The reason is that the infrared absorber is inferior in heat resistance, and is almost completely decomposed by heat when molding a polycarbonate resin plate or the like. This is clear from the graph of FIG.

That is, FIG. 4 is a graph showing the total light transmittance of the polycarbonate resin plate containing the infrared absorbing agent, and the curve E indicates that the infrared absorbing agent (aminium-based compound) is 0.1%.
3mm thick PC board E which is injection molded of polycarbonate resin containing 1% by weight at 290 ° C and residence time of 4 minutes and 45 seconds.
The curve F shows the total light transmittance of the PC plate F injection-molded by changing only the residence time to 6 minutes and 45 seconds, and the curve G shows only the residence time. The total light transmittance of the injection-molded PC plate G changed to 8 minutes and 45 seconds is shown. According to this graph, even the PC board E having a short residence time of 4 minutes and 45 seconds transmits near infrared rays by about 30% or more, and the PC board F having a residence time of 6 minutes and 45 seconds and the PC board F of 8 minutes and 45 seconds.
It can be seen that the PC board G for 2 seconds transmits near infrared rays so well that it hardly differs from the PC board A containing no infrared absorbent shown in FIG.

〔The invention's effect〕

As can be understood from the above description, the heat ray absorbing plate of the present invention has good transparency to visible light because both the substrate and the surface layer are translucent, and the content of 0.03 to 0.12 mg / cm ^{2 in} the surface layer. The aminium-based infrared absorber contained in (1) absorbs most of the heat rays and can exhibit good heat insulation properties. Also, since the surface layer is an acrylic resin layer, adopt gentle heating and pressure It can be easily manufactured by laminating and integrating on the surface of a thermoplastic resin substrate without decomposing the absorbent almost, the peeling strength between the surface layer and the substrate increases, and the shape of the desired light-collecting material by thermoforming etc. It has remarkable effects such as easy molding.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the heat ray absorbing plate of the present invention, FIG. 2 is a sectional view showing another embodiment of the heat ray absorbing plate of the present invention, and FIG. FIG. 4 is a graph showing the total light transmittance of a PC plate containing an infrared absorbing agent, and FIG. 5 is a schematic explanatory view of an apparatus used for a heat insulation test.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-281837 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04C 2/54 B32B 27/00

Claims (1)

(57) [Claims] 1. A translucent acrylic resin surface layer containing an aminium-based infrared absorber in a content of 0.03 to 0.12 mg / cm ^{2 on} a surface of a translucent thermoplastic resin substrate. An integrated heat ray absorbing plate.