JP3329959B2 - Heat ray shielding material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat ray shielding material which can be suitably used as a daylighting material.

[0002]

2. Description of the Related Art For roof materials and side wall materials such as so-called sunrooms and carports which require high light-transmitting properties (light-transmitting properties), flat materials and corrugated materials made of synthetic resin materials having excellent light-transmitting properties are used. Is often used. Synthetic resin materials used for this purpose include transparent or translucent ones, colorless ones, achromatic ones and chromatic ones.

[0003] When a synthetic resin material having the above-mentioned light-transmitting properties is used for a roof material or a side wall material, especially in summer, due to its excellent light-transmitting property, heat rays are transmitted too much together with light. Born, for example, in a solarium or carport, the room temperature or the body temperature may be too high.

Therefore, recently, the synthetic resin material is colored so as to have a hue such as brown smoke or gray smoke within a range that does not significantly reduce the light transmittance of the synthetic resin material.

[0005]

However, under the conventional concept of providing a heat ray shielding effect by coloring a synthetic resin material, the light transmittance is also reduced at the same time. In order to obtain the heat ray shielding effect, it is unavoidable that the light transmittance becomes too low and the interior becomes dark, and there is a problem that such products are not preferred by consumers.

The present invention has been made in view of the above circumstances, and by adopting a means of adding a certain pigment to a light-transmitting synthetic resin layer, the light-transmitting property is not significantly reduced. It is an object of the present invention to provide a heat ray shielding material having a characteristic that a high heat ray shielding effect can be obtained.

[0007]

The heat ray shielding material according to the first aspect of the present invention is such that a pearl pigment is added to a synthetic resin layer having a light transmitting property.

In such a heat ray shielding material, it is desirable to add 0.5 to 1.5% by weight of a pearl pigment having a particle size distribution of 5 to 60 μm as in the second aspect of the present invention. Further, as in the invention according to claim 3, the synthetic resin layer is a polycarbonate resin layer, and the thickness thereof is 0.5.
It is desirably about 5.0 mm.

[0009]

According to the first aspect of the present invention, heat rays are shielded by the pearl pigment added to the synthetic resin layer, and at least in the gap between the particles of the pearl pigment added to the synthetic resin layer, at least the permeability of the synthetic resin layer itself is reduced. It is based on the idea of ensuring light.

In the heat ray shielding material according to the present invention, a stable inorganic pearl pigment obtained by coating the surface of natural mica with a metal oxide having a large light refractive index such as titanium oxide or iron oxide is preferably used as the pearl pigment. Can be. It is presumed that such an inorganic pearl pigment is one of the factors that exhibit an excellent heat ray shielding effect because of its inorganic nature.

The synthetic resin layer is formed of a polycarbonate resin, and a pearl pigment having a particle size distribution of 5 to 60 μm is added to the synthetic resin layer in an amount of 0.5 to 1.5% by weight. Plate material (referred to as invention in this section)
When comparing the total light transmittance and the heat ray shielding rate with the conventional flat plate and corrugated sheet made of synthetic resin colored brown smoke of the same thickness as the conventional product, the invention product has a higher total light transmittance than the conventional product. Despite being large, the heat ray shielding rate increases. In addition, a flat plate material or a corrugated plate material in which the inorganic pearl pigment is added to the light-transmitting synthetic resin layer causes light to impinge on the inorganic pearl pigment to cause regular multiple reflection, thereby exhibiting a soft pearl luster.

[0012]

FIG. 1 shows a heat ray shielding material A according to a first embodiment of the present invention. In this embodiment, a skin material 2 is provided on the surface of a light-transmitting synthetic resin layer 1 to which a pearl pigment is added. In this case, a film of methyl methacrylate resin (MMA) is laminated and integrated to prevent light deterioration of the synthetic resin layer 1 and the pearl pigment. In the first embodiment, the synthetic resin layer 1 has a thickness of about 0.5 to 5.0 mm, preferably 0.5 to 1.5 mm, for example, a polycarbonate resin (PC) sheet, Sheets made of a thermoplastic synthetic resin such as a vinyl resin (PVC) sheet and a methyl methacryl (MMA) sheet are used. In addition, it is possible to omit the skin material 2, and in that case, it is beneficial to use an MMA sheet for the synthetic resin layer 1 to which the pearl pigment is added and which has a light transmitting property.

The heat ray shielding material A described in the first embodiment can be used by sticking it to a daylighting plate made of glass or synthetic resin if it is thin and flexible. Further, a hard and strong material can be formed into a flat plate or a corrugated plate A 'as shown in FIG. 3 and suitably used as a daylighting material having an excellent heat ray shielding effect. In addition, thicker ones are molded by vacuum or compressed air to make them thinner,
It is suitably used as a material for molded articles such as skylight domes and lighting covers. In the corrugated sheet of FIG. 3, the thickness of the light-transmitting synthetic resin layer 1 to which the pearl pigment is added is 0.7 to 1.5 mm, and the thickness of the MMA film as the skin material 2 is 30 to It is 300 μm.

FIG. 2 shows a heat ray shielding material A "according to a second embodiment of the present invention. In this embodiment, a methyl methacrylate resin is applied to the surface of a light-transmitting synthetic resin layer 1 to which a pearl pigment is added. A (MMA) film is laminated and integrated, and the synthetic resin layer 1 is laminated and integrated on a light-transmitting substrate 3. In the second embodiment, an MMA film is used for the skin material 2, The above-mentioned various synthetic resins are used for the light-transmitting synthetic resin layer 1 to which the pearl pigment is added, and the base material 3 is a synthetic resin excellent in light transmission selected from PC, PVC, MMA, and the like. Preferably, a transparent synthetic resin is used, and the transparency of the heat ray shielding agent A ″ is not reduced by keeping the substrate 3 transparent. The synthetic resin used for the synthetic resin layer 1 and the base material 3 may be the same or different.

The heat ray shielding material A ″ described in the second embodiment is
This corresponds to a structure in which the base material 3 is laminated and integrated with the heat ray shielding material A described in the first embodiment. In such a heat ray shielding material A ″, since the overall thickness is increased by the base material 3 and the strength is enhanced, it is used for a large-sized daylighting window, a roofing material or a wall material for daylighting, or the like. It is possible and preferably used as a molded dome-shaped daylighting window or as a folded-type daylighting roof or wall material.

Incidentally, as the pearl pigment to be added to the synthetic resin layer 1, commercially available products can be used. This pearl pigment is capable of artificially exhibiting pearl luster by regularly reflecting light multiple times, and the pearl luster is more remarkably exhibited as the synthetic resin layer to which it is added has superior translucency. Is done. This pearl pigment is obtained by coating the surface of natural mica with a metal oxide having a large photorefractive index such as titanium oxide or iron oxide, and is a chemically stable inorganic pearl pigment. There are various particle size distributions of the pearl pigments, for example, 10 to 60 μm, 10 to 50 μm,
20 μm, 30-100 μm, 40-200 μm, 6-
It has a particle size distribution such as 50 μm, 10 to 40 μm, and 15 μm or less.
Pearl pigments having a flow distribution of 0 μm can be particularly preferably used.

Next, a description will be given of a test experiment on the optical characteristics and the heat ray shielding effect of the heat ray shielding material according to the present invention.

Table 1 shows the results of a table test on the optical characteristics and the heat ray shielding effect of a 1 mm thick heat ray shielding plate (without a skin material). Sample No. 1 of Table 1
In No. 13, PC is used as the synthetic resin, and the particle size distribution and the amount of the pearl pigment to be added thereto and the amount of the wetting agent are shown. Sample Nos. 1 to 9 show the products of the present invention, and Sample Nos. 10 and 11 show comparative products. The value indicating the heat ray shielding effect in Table 1 is based on the transmittance of the sample at each wavelength based on the graph of the amount of sunlight energy for each wavelength published by the Research Institute of Electric Power. The amount is calculated, the ratio of the total amount of solar energy in the wavelength range of 400 to 1000 nm is determined, and the values are calculated by applying the values to the equation (1).

[0019]

[Table 1]

[0020]

(Equation 1)

According to Table 1, in the case of a 1 mm thick plate material using PC as a synthetic resin, the total light transmittance and the heat ray shielding effect change according to the change in the amount of the pearl pigment added.

Taking into account the total light transmittance and the heat ray shielding effect of the sample No. 10 made of a pellet of PC alone and the sample No. 11 made of a commercially available PC pellet for brown smoke, 0.5 ~ 1.5
It can be seen that it is sufficient to add pearl pigment in an amount of 0.7% to 1.5% by weight, preferably 0.7 to 1.5% by weight. If the amount of the pearl pigment is less than 0.5% by weight, the heat ray shielding effect is too small, and if it is more than 1.5% by weight, the total light transmittance is too small. Regardless of the particle size distribution of the pearl pigment, if it is within the range of 0.5 to 1.5% by weight, the total light transmittance is substantially equal to or better than that of the sample of No. 11, but the heat ray shielding is obtained. It can be seen that the effect is good, the film has a light-transmitting property, and has a heat ray shielding property. 5μ particle size distribution
If it is less than m, the particle size of the pearl pigment is too small and the total light transmittance is too small, and if it is more than 60 μm, the total light transmittance is too large.
A shining pearly luster is recognized and the hue becomes undesirable.

Next, in order to confirm the results of the table test, a composition having the same composition as the sample of No. 5 shown in Table 1 was formed into a corrugated 0.7 mm thick P using an extruder.
0.7 mm thick with brown smoke hue using C corrugated sheet material (invention product) and pellets of sample No. 11
Manufactured PC corrugated sheet (conventional product), measured their optical properties and heat ray shielding effect, and manufactured a box of the same shape and size using those corrugated sheets to produce the same place on the same day. The heat ray shielding effect was compared by measuring the internal temperature with time in the above. Table 2 shows the values indicating the optical characteristics and the heat ray shielding effect of the invention product and the conventional product. Although the invention product used here and the conventional product both have the same thickness (ultra thin) MMA film laminated and integrated on the surface,
Since the film is a material having an excellent total light transmittance, the relative relationship between the total light transmittance and the heat ray shielding effect between the invention product and the conventional product is not impaired by laminating the MMA film. Note that FIG. 4 additionally shows a change in temperature, and the numerical values in FIG. 4 indicate the temperatures in the boxes.

[0024]

[Table 2]

According to Table 2, both the invention product and the conventional product have No.
The total light transmittance is higher than the samples No. 5 and No. 11 (thickness: 1 mm). This is because the invention and conventional products are N
This is considered to be due to the fact that it is thinner than the samples of o5 and No11. Table 2 shows the same tendency as the table test results described in Table 1, indicating that the invention product is excellent in the heat ray shielding effect despite the high total light transmittance. And, as is clear from the graph of FIG. 4, the invention product is more excellent in the heat ray shielding effect than the conventional product even if it is formed into the same corrugated plate as the commercial product, and the temperature difference caused by the heat ray shielding is 3 to
The temperature reached 10 ° C., indicating that heat rays can be sufficiently shielded even when actually used for roofing materials. On the other hand, with respect to the total light transmittance, it can be seen that the invention product is superior to the conventional product and has good light transmittance and is bright.

The heat ray shielding material described in the experimental example uses PC as a synthetic resin layer, and therefore has a unique property that mechanical properties such as impact resistance are superior to those using other synthetic resins. have. Since the thickness of the synthetic resin layer made of PC is 0.7 mm, which is within the range of 0.5 to 5.0 mm, it can sufficiently withstand actual use as a corrugated material.

The heat ray shielding material according to the present invention can be carried out in the following modes in addition to those described in the embodiments. (1) The synthetic resin layer is colored chromatic or achromatic. (2) Use the heat ray shielding material as a flat plate. (3) Use a heat ray shielding material as a corrugated sheet material.

[0028]

According to the first aspect of the present invention, the pearl pigment added to the synthetic resin layer blocks heat rays, and at least the synthetic resin layer itself is provided at a gap between particles of the pearl pigment added to the synthetic resin layer. Based on the idea of ensuring the translucency of light. This is technically different from that based on the idea of suppressing the passage of heat rays by suppressing the passage of light as in the conventional product in which the synthetic resin layer is colored with brown smoke or the like.

According to the first and second aspects of the present invention, heat rays passing through the light-transmitting synthetic resin layer are efficiently shielded by the pearl pigment having an excellent heat ray shielding effect. Since the total amount of light transmitted by the light-transmitting synthetic resin layer is ensured by appropriately suppressing the amount of the pigment added, heat rays can be applied without using means such as coloring that would significantly reduce the total light transmittance. It is possible to enhance the shielding effect.

According to the third aspect of the present invention, the synthetic resin layer is a polycarbonate resin and has a thickness of 0.5 to 0.5.
Since it is 5.0 mm, there is an advantage that a heat ray shielding material having no problem in practical use can be obtained by taking advantage of excellent mechanical strength such as impact resistance inherently possessed by the polycarbonate resin.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a heat ray shielding material according to a first embodiment of the present invention.

FIG. 2 is an explanatory sectional view of a heat ray shielding material according to a second embodiment of the present invention.

FIG. 3 is an explanatory view of a corrugated sheet made of the heat ray shielding material of the present invention.

FIG. 4 is a table showing measured values of the total light transmittance and the heat ray shielding effect of the heat ray shielding material of the present invention.

[Explanation of symbols]

 A heat ray shielding material 1 synthetic resin layer to which pearl pigment is added

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Kageyama 2-3-13 Azuchi-cho, Chuo-ku, Osaka-shi Examiner in Takiron Co., Ltd. Satoshi Morikawa (56) References JP-A-4-23836 (JP, A (58) Fields investigated (Int. Cl. ⁷ , DB name) C08J 5/00 C08J 5/18 C08L 69/00

Claims (3)

(57) [Claims] 1. A heat ray shielding material characterized in that a pearl pigment is added to a synthetic resin layer having translucency. 2. The heat ray shielding material according to claim 1, wherein a pearl pigment having a particle size distribution of 5 to 60 μm is added in an amount of 0.5 to 1.5% by weight. 3. The heat ray shielding material according to claim 2, wherein the synthetic resin layer is a polycarbonate resin layer, and has a thickness of 0.5 to 5.0 mm.