JPH08120094A - Heat ray-shielding material - Google Patents

Abstract

PURPOSE: To obtain a heat ray-shielding material having excellent heat ray- shielding effect in contrast to its light transmission. CONSTITUTION: A pearl pigment having a particle size distribution such that the size of the particles ranges from 5 to 60μm is incorporated in an amt. of 0.5 to 1.5wt.% into a synthetic resin layer having a light transmission property. Pref., the synthetic resin layer is formed of a polycarbonate resin.

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 Prior Art Roof materials and side wall materials for so-called sunrooms and carports, which are required to have a high light-transmitting property (translucency), include flat plate materials and corrugated plate materials made of synthetic resin material having excellent light-transmitting property. Is often used. Synthetic resin materials used for this purpose include transparent or translucent ones, colorless ones, and achromatic or chromatic ones.

When a synthetic resin material having a light-transmitting property as described above is used as a roofing material or a side wall material, especially in the summer, the heat ray is too much transmitted along with the light due to its excellent light-transmitting property. Born, for example, in the sunroom and carport, the room temperature and body temperature may rise too high.

Therefore, in recent years, it has been practiced to color the synthetic resin material so as to have a hue such as brown smoke or gray smoke within a range that does not significantly reduce the translucency of the synthetic resin material.

[0005]

However, under the conventional idea that the heat ray shielding effect is provided by coloring the synthetic resin material, the light transmission property is also lowered at the same time. In order to obtain the heat ray shielding effect of (1), it is inevitable that the light transmittance is too low and the room becomes dark, and there is a problem that such a product is 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 synthetic resin layer having a light-transmitting property, the light-transmitting property is not so lowered. 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 of the invention according to claim 1 is 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 that 0.5 to 1.5% by weight of a pearl pigment having a particle size distribution of 5 to 60 μm is added as in the second aspect of the invention. Further, as in the invention according to claim 3, the synthetic resin layer is a polycarbonate resin layer having a thickness of 0.5.
It is desirable that it is ˜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 the transparent resin layer itself is transparent in the gaps between the particles of the pearl pigment added to the synthetic resin layer. It is based on the idea of securing light.

In the heat ray-shielding material according to the present invention, a stable inorganic pearl pigment in which the surface of natural mica is coated with a metal oxide having a large photorefractive index such as titanium oxide or iron oxide is preferably used as the pearl pigment. You can It is presumed that such an inorganic pearl pigment is one of the factors that exhibit an excellent heat ray shielding effect because it is inorganic.

A 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 an invention product in this section)
When compared with the conventional product, the total light transmittance and the heat ray shielding ratio of the flat plate material and the corrugated plate material of the synthetic resin colored with brown smoke of the same thickness as the conventional product are compared. Despite being large, the heat ray shielding rate becomes large. A flat plate material or a corrugated plate material in which the above-mentioned inorganic pearl pigment is added to a light-transmitting synthetic resin layer causes regular multiple reflection due to the light hitting the inorganic pearl pigment, and exhibits 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 surface material 2 is formed on the surface of a synthetic resin layer 1 having a translucency and containing a pearl pigment. As a result, a film of a methyl methacrylate resin (MMA) is laminated and integrated to prevent photodegradation 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, such as a polycarbonate resin (PC) sheet or polychlorinated sheet. Sheets made of thermoplastic synthetic resin such as vinyl resin (PVC) sheet and methyl methacryl (MMA) sheet are used. The skin material 2 can be omitted, and in that case, it is advantageous to use an MMA sheet for the synthetic resin layer 1 having a light-transmitting property and containing a pearl pigment.

The heat ray shielding material A described in the first embodiment can be used by adhering it to a lighting plate made of glass or synthetic resin if it is thin and has flexibility. Further, a hard and strong material can be suitably used as a daylighting material having an excellent heat ray shielding effect by forming it into a flat plate material or a corrugated plate material A'as shown in FIG. Furthermore, those with a large wall thickness are molded by vacuum or compressed air to make a thin wall,
It is preferably used as a material for molded products such as skylight domes and lighting covers. In the corrugated plate of FIG. 3, the translucent synthetic resin layer 1 to which the pearl pigment is added has a thickness of 0.7 to 1.5 mm, and the MMA film as the skin material 2 has a thickness of 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 formed on the surface of a synthetic resin layer 1 having a translucency and containing a pearl pigment. The (MMA) film is laminated and integrated, and the synthetic resin layer 1 is laminated and integrated on the translucent base material 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 transparent synthetic resin layer 1 to which a pearl pigment is added, and the base material 3 is a synthetic resin selected from PC, PVC, MMA, etc., which has excellent transparency, A transparent synthetic resin is preferably used.By making the base material 3 transparent, the translucency of the heat ray shielding agent A ″ is not deteriorated. The synthetic resins 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
It corresponds to the heat ray shielding material A described in the first embodiment in which the base material 3 is laminated and integrated. In such a heat ray shielding material A ″, since the entire thickness is increased by the base material 3 to increase the strength, it can be used for a daylighting window having a large area, a roofing material for lighting, a wall material, and the like. It is possible and is preferably used as a molded dome-shaped daylighting window, or as a plate-shaped daylighting roof material or wall material.

By the way, as the pearl pigment added to the synthetic resin layer 1, commercially available products can be used. This pearl pigment is capable of artificially expressing pearl luster by regularly reflecting light, and the pearl luster is more pronounced as the synthetic resin layer to which it is added is more transparent. To be done. This pearl pigment is a chemically stable inorganic pearl pigment in which the surface of natural mica is coated with a metal oxide having a large photorefractive index such as titanium oxide or iron oxide. There are various particle size distributions of the pearl pigment, for example, 10 to 60 μm, 10 to 50 μm, 5 to
20 μm, 30 to 100 μm, 40 to 200 μm, 6 to
It has a particle size distribution of 50 μm, 10 to 40 μm, 15 μm or less, etc.
Pearl pigments having a flow distribution of 0 μm can be used particularly preferably.

Next, a description will be given of investigation experiments 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 heat ray shielding plate (those having no skin material) having a thickness of 1 mm. Sample No. 1 in Table 1
In PC No. 13, PC is used as the synthetic resin, and the particle size distribution and addition amount of the pearl pigment added to it and the addition amount of the wetting agent are shown. Sample Nos. 1 to 9 represent the products of the present invention, and Samples Nos. 10 and 11 represent the comparative products. In addition, the value showing the heat ray shielding effect in Table 1 is the transmitted solar energy at the transmittance for each wavelength of the sample based on the graph of the amount of solar energy for each wavelength published by the Research Institute of Electrical Engineering. The amount is calculated, the ratio of the total amount of solar energy in the wavelength range of 400 to 1000 nm is calculated, and these values are applied to the equation (1) to calculate the values.

[0019]

[Table 1]

[0020]

[Equation 1]

From Table 1, it can be seen that in a plate material having a thickness of 1 mm using PC as the synthetic resin, the total light transmittance and the heat ray shielding effect are changed depending on the change of the addition amount of the pearl pigment.

Then, considering the total light transmittance and the heat ray shielding effect of the No. 10 sample prepared from the pellets of PC alone and the No. 11 sample prepared from the commercially available PC pellets for brown smoke, 0.5 ~ 1.5
It will be appreciated that the pearl pigment may be added in a weight percent, preferably 0.7-1.5 weight percent. If the addition amount of the pearl pigment is less than 0.5% by weight, the heat ray shielding effect becomes too small, and if it is more than 1.5% by weight, the total light transmittance becomes too small. In addition, regardless of the particle size distribution of the pearl pigment, if the total light transmittance is approximately the same or good as that of No. 11 sample within the range of 0.5 to 1.5% by weight, heat ray shielding It can be seen that the effect is good, it has a light-transmitting property, and it has a heat-ray shielding property. Particle size distribution is 5μ
When it is in the range smaller than m, the particle diameter of the pearl pigment is too small and the total light transmittance is too small, and in the range where it is larger than 60 μm, the total light transmittance becomes too large and
A glittering pearly luster is observed, and the hue becomes unfavorable.

Next, in order to confirm the results of the table test, a composition having the same composition as the No. 5 sample shown in Table 1 was formed into a corrugated shape by using an extruder, and the P having a thickness of 0.7 mm was formed.
0.7mm thickness with brown smoke color using C11 corrugated sheet material (invention) and No11 sample pellets
PC corrugated sheet materials (conventional product) of, and their optical characteristics and heat ray shielding effect are measured, and boxes of the same shape and size are manufactured using these corrugated sheet materials to produce the same place on the same day. The heat ray shielding effect was compared by measuring the internal temperature with time. Table 2 shows the optical characteristics of the invention product and the conventional product and values showing the heat ray shielding effect, and FIG. 4 shows a graph (chart) of the measured values of the internal temperature of the box. Both the invention product and the conventional product used here have the same thickness (ultra-thin) MMA film laminated on the surface.
Since the film is a material having an extremely 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 temperature changes, and the numerical values in the figure represent the temperature inside the box.

[0024]

[Table 2]

According to Table 2, both the invention product and the conventional product are No.
The total light transmittance is higher than the samples No. 5 and No. 11 (thickness 1 mm). This is N for invention products and conventional products.
It is considered that this is 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 result described in Table 1, and it is understood that the invention product is excellent in the heat ray shielding effect even though the total light transmittance is high. And, as is clear from the graph of FIG. 4, even if the invention product is molded into the same corrugated plate as the commercially available product, the invention product is superior to the conventional product in the heat ray shielding effect, and the temperature difference caused by the heat ray shielding is 3 to 3.
It has reached 10 ° C, and it can be seen that the heat rays can be sufficiently shielded even when actually used for roofing materials and the like. On the other hand, regarding the total light transmittance, the invention product is superior to the conventional product, and it is clear that the light transmittance is good and bright.

Since the heat ray-shielding material described in the experimental example uses PC as the synthetic resin layer, it has a unique property that mechanical properties such as impact resistance are superior to those when other synthetic resins are used. have. Further, 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, the corrugated material is sufficiently durable for practical use.

The heat ray shielding material according to the present invention can be implemented 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 material. (3) Use the heat ray shielding material as a corrugated sheet material.

[0028]

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 the synthetic resin layer itself is present in the gaps between the particles of the pearl pigment added to the synthetic resin layer. It is based on the idea of ensuring the translucency of. In this respect, it is technically different from the one 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 in brown smoke or the like.

According to the first and second aspects of the present invention, the heat ray passing through the translucent synthetic resin layer is efficiently shielded by the pearl pigment having an excellent heat ray shielding effect. By controlling the amount of pigment added appropriately, a large total light transmittance can be secured by the translucent synthetic resin layer, so heat rays can be used without using a means such as coloring that greatly reduces the total light transmittance. It becomes possible to enhance the shielding effect.

According to the third aspect of the invention, the synthetic resin layer is made of polycarbonate resin and has a thickness of 0.5 to
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 utilizing the excellent mechanical strength such as impact resistance which the polycarbonate resin originally has.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional explanatory 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 material manufactured from the heat ray shielding material of the present invention.

FIG. 4 is a table showing measured values of total light transmittance and 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 with pearl pigment added

Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technical indication location E04H 6/02 A 7606-2E (72) Inventor Hiroshi Kageyama 2-3-3 Azuchi-cho, Chuo-ku, Osaka Taki Ron Co., Ltd.

Claims (3)

[Claims] 1. A heat ray shielding material, wherein a pearl pigment is added to a synthetic resin layer having translucency. 2. The heat ray shielding material according to claim 1, wherein 0.5 to 1.5% by weight of a pearl pigment having a particle size distribution of 5 to 60 μm is added. 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.