JP2022158509A - Resin molding, heat ray-shielding plate, roof material, and window material - Google Patents

Abstract

To provide a resin molding which is excellent in transparency, low colorability and heat ray shielding property, and a heat ray shielding plate, a roof material and a window material which include the resin molding.SOLUTION: A resin molding contains a transparent resin (A) and a pearl pigment (B), wherein the pearl pigment (B) has a particle diameter (D90) of 22.0 μm or more and 41.0 μm or less in which the cumulative frequency reaches 90% in cumulative frequency distribution curve of a particle size. A resin molding contains a transparent resin (A) and a pearl pigment (B), wherein the total light transmittance measured according to JIS K 7375 is 40% or more, and the total of solar reflectance and solar absorptivity measured according to ISO 9050 is 63% or more.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to resin moldings, heat ray shielding plates, roofing materials, and window materials.

In recent years, roofing materials and window materials for buildings, automobiles, trains, buses, etc., as well as protective materials for lighting devices, signboards, etc., contain light in the infrared region contained in light from light sources such as sunlight, fluorescent lamps, and lamps. (hereinafter abbreviated as "heat ray") is required to have a property (hereinafter abbreviated as "heat ray shielding property"). That is, there is a demand for a resin molded article having excellent heat ray shielding properties.

Furthermore, in the above applications, from the viewpoint of ensuring brightness by transmitting a certain amount of light, it is necessary to moderately transmit light in the visible light region included in light from light sources such as sunlight, fluorescent lamps, and lamps. requested. That is, there is a demand for resin moldings having appropriate transparency.

In addition, for illumination signboard applications and illumination applications, there is a demand for resin moldings having appropriate concealability in order to conceal the shapes of light sources such as fluorescent lamps and LEDs with illumination signboards and illumination lamp covers.

As a technique for imparting concealability to a resin molding, for example, Patent Document 1 discloses a methacrylic resin plate in which a pearl pattern material having a specific particle size is blended with a methacrylic resin.

JP 2010-168430 A

However, the resin plate with a pearl pattern disclosed in Patent Document 1 has insufficient heat ray shielding properties and light diffusing properties.

Furthermore, according to the studies of the present inventors, it is difficult to achieve both transparency and hiding properties by simply adjusting the content of additives such as light diffusing agents for improving heat ray shielding properties.

An object of the present invention is to solve these problems. That is, an object of the present invention is to provide a resin molded article having excellent heat ray shielding properties, moderate transparency, and suitable shielding properties; be.

The first gist of the present invention is that it contains a transparent resin (A) and a pearl pigment (B), and the pearl pigment (B) has a particle size ( D ₉₀ ) is 22.0 μm or more and 41.0 μm or less.
The second gist of the present invention is that it contains a transparent resin (A) and a pearl pigment (B), and has a total light transmittance of 40% or more measured according to JIS K7375, which was measured according to ISO9050. The resin molding has a total solar reflectance and solar absorptance of 63% or more.
A third gist of the present invention is a heat ray shielding plate including the resin molding.
A fourth gist of the present invention is a roofing material including the resin molding.
A fifth gist of the present invention resides in a window material including the resin molding.

INDUSTRIAL APPLICABILITY According to the present invention, there are provided a resin molded article having excellent heat ray shielding properties, moderate transparency, and suitable shielding properties; and a heat ray shielding plate, roofing material, and window material containing the resin molded article.

The present invention will be described in detail below.

In the present invention, "(meth)acrylate" and "(meth)acrylic acid" are each at least one selected from "acrylate" and "methacrylate" and at least one selected from "acrylic acid" and "methacrylic acid" means
Further, "monomer" means an unpolymerized compound, and "repeating unit" means a unit derived from the monomer formed by polymerizing the monomer. The repeating units may be units directly formed by a polymerization reaction, or some of the units may be converted to another structure by treating the polymer. A "structural unit" means a unit derived from a monomer used for producing a resin molded product.
In the present invention, "% by mass" indicates the content ratio of a given component contained in 100% by mass of the total amount.
Unless otherwise specified, the numerical range represented by using "to" in this specification means a range including the numerical values described before and after "to" as lower and upper limits, and "A to B" means greater than or equal to A and less than or equal to B.

<Resin molding>
As a first embodiment of the resin molding of the present invention, it contains a transparent resin (A) described later and a pearl pigment (B) described later, and the pearl pigment (B) is accumulated in a cumulative frequency distribution curve of particle diameters. A resin molding (hereinafter also referred to as a resin molding (1)) having a particle size (D ₉₀ ) of 22.0 μm or more and 41.0 μm or less at a frequency of 90% can be mentioned.

Further, in the resin molded product (1) of the present invention, the pearl pigment (B) has a particle size ( _D50 ) of 12.5% at which the cumulative frequency is 50% in the cumulative frequency distribution curve of the particle size for the reason described later. It is preferably 0 μm or more and 23.0 μm or less.

In the resin molded product (1) of the present invention, the pearl pigment (B) has a particle diameter (D ₉₀ ) and a cumulative frequency at which the cumulative frequency is 90% in the cumulative frequency distribution curve of the particle diameter for the reason described later. It is preferable that the ratio (D ₉₀ /D ₁₀ ) to the particle size (D ₁₀ ) at which is 10% is 3.3 or more.

As a second embodiment of the resin molding of the present invention, it contains a transparent resin (A) described later and a pearl pigment (B) described later, has a total light transmittance of 40% or more, and has a solar reflectance and a solar absorption. A resin molded article having a total ratio of 63% or more (hereinafter also referred to as a resin molded article (2)) can be mentioned.

If the lower limit of the total light transmittance of the resin molded body (2) is 40% or more, the light from light sources such as sunlight, fluorescent lamps, lamps, etc. can be The light in the visible light region included in the can be transmitted appropriately, and the brightness can be secured. 55% or more is preferred. On the other hand, the upper limit of the total light transmittance of the resin molded body (2) is not particularly limited, but in applications such as roofing materials, window materials, lighting devices, signboards, etc., the resin molded body has heat ray shielding properties and moderate hiding properties. is preferably 70% or less, more preferably 65% or less. The above upper and lower limits can be combined arbitrarily.
The total light transmittance of the resin molded body (2) is controlled by appropriately selecting the particle diameter (D ₉₀ , D ₅₀ , D ₁₀ ) of the pearl pigment (B) described later and the content of the pearl pigment (B). can.
The details of the method for measuring the total light transmittance in the present invention will be described later.

When the lower limit of the sum of the solar reflectance and the solar absorptivity of the resin molded article (2) is 63% or more, the resin molded article has excellent heat shielding properties against heat rays. 65% or more is preferable, and 70% or more is more preferable. On the other hand, the upper limit of the sum of the solar reflectance and the solar absorptance is not particularly limited, but is preferably 95% or less, and 93% or less, since the resin molded article (2) maintains moderate transparency and moderate hiding power. is more preferable, and 91% or less is even more preferable. The above upper and lower limits can be combined arbitrarily.

Although the lower limit of the solar reflectance of the resin molded article (2) is not particularly limited, it is preferably 30% or more because the resin molded article has excellent heat shielding properties against heat rays. 35% or more is more preferable. On the other hand, the upper limit of the solar reflectance of the resin molding (2) is not particularly limited, but is preferably 60% or less, and 50 % or less is more preferable. The above upper and lower limits can be combined arbitrarily.

Although the lower limit of the solar absorptivity of the resin molded article (2) is not particularly limited, it is preferably 25% or more because the resin molded article has excellent heat shielding properties against heat rays. 28% or more is more preferable. On the other hand, the upper limit of the solar absorptivity of the resin molded article (2) is not particularly limited, but is preferably 40% or less because the resin molded article (2) maintains appropriate transparency and appropriate hiding power. % or less is more preferable. The above upper and lower limits can be combined arbitrarily.
The solar reflectance and solar absorptivity of the resin molding (2) are determined by appropriately selecting the particle diameter (D ₉₀ , D ₅₀ , D ₁₀ ) of the pearl pigment (B) and the content of the pearl pigment (B). can be controlled by
The details of the method for measuring the solar reflectance and the solar absorptance in the present invention will be described later.

The resin molding (2) of the present invention preferably has a diffusivity of 3.0 or more and 60 or less.
The lower limit of the diffusivity of the resin molded product is not particularly limited, but if it is 3.0 or more, the resin molded product has excellent concealability. 4.0 or more is more preferable, and 5.0 or more is even more preferable. On the other hand, the upper limit of the diffusivity of the resin molded product is not particularly limited, but if it is 60 or less, the resin molded product has excellent heat shielding properties against heat rays and can maintain appropriate transparency. 30 or less is more preferable, and 10 or less is even more preferable. The above upper and lower limits can be combined arbitrarily.
The diffusivity of the resin molding can be controlled by appropriately selecting the particle diameter (D ₉₀ , D ₅₀ , D ₁₀ ) of the pearl pigment (B) and the content of the pearl pigment (B), which will be described later.
The details of the method of measuring the diffusivity in the present invention will be described later.

The resin molding (2) of the present invention preferably has a solar radiation shielding coefficient of 0.35 or more and 0.70 or less.
The solar radiation shielding coefficient is an index of the heat ray heat shielding property of the resin molding, and is approximately the same as the value obtained by dividing the solar heat gain rate of the resin molding by 0.88. means that
The lower limit of the solar radiation shielding coefficient of the resin molding is not particularly limited, but as long as it is 0.35 or more, the resin molding has moderate transparency and moderate shielding properties. 0.40 or more is more preferable. On the other hand, the upper limit of the solar radiation shielding coefficient of the resin molding is not particularly limited, but if it is 0.70 or less, the resin molding is excellent in heat ray shielding properties and moderate shielding properties. 0.60 or less is more preferable, and 0.49 or less is even more preferable. The above upper and lower limits can be combined arbitrarily.
The solar radiation shielding coefficient of the resin molding can be controlled by appropriately selecting the particle diameter ( _D90 , _D50 , _D10 ) of the pearl pigment (B) and the content of the pearl pigment (B), which will be described later.
The details of the method for measuring the solar radiation shielding coefficient in the present invention will be described later.

Further, in the resin molding (2) of the present invention, the pearl pigment (B) has a particle diameter (D ₉₀ ) of 22.0% at which the cumulative frequency is 90% in the particle diameter cumulative frequency distribution curve for the reason described later. It is preferably 0 μm or more and 41.0 μm or less.

In the resin molding (2) of the present invention, the pearl pigment (B) has a particle diameter (D ₉₀ ) of 12.5% at which the cumulative frequency is 50% in the particle diameter cumulative frequency distribution curve for the reason described later. It is preferably 0 μm or more and 23.0 μm or less.

In the resin molded product (2) of the present invention, the pearl pigment (B) has a particle diameter (D ₉₀ ) and a cumulative frequency at which the cumulative frequency is 90% in the cumulative frequency distribution curve of the particle diameter for the reason described later. It is preferable that the ratio (D ₉₀ /D ₁₀ ) to the particle size (D ₁₀ ) at which is 10% is 3.3 or more.

The lower limit of the content of the transparent resin (A) that can be contained in the resin molded articles (1) and (2) of the present invention (hereinafter simply referred to as "resin molded articles") is It is preferably 97.0% by mass or more, and 98.0% by mass or more, relative to 100% by mass of the resin molded body, because the transparency, weather resistance, mechanical strength, etc. that are used can be maintained satisfactorily. is more preferable, and 99.0% by mass or more is even more preferable. On the other hand, the upper limit of the content of the transparent resin (A) is preferably 99.95% by mass or less with respect to 100% by mass of the resin molding, in order to ensure the heat ray shielding property of the resin molding. 0.9% by mass or less is more preferable, and 99.8% by mass or less is even more preferable.
The above upper and lower limits can be combined arbitrarily. For example, the content of the transparent resin (A) contained in the resin molded body of the present invention is preferably 97.0% by mass or more and 99.95% by mass or less, and 98.0% by mass with respect to 100% by mass of the resin molded body. % or more and 99.9 mass % or less is more preferable, and 99.0 mass % or more and 99.8 mass % or less is even more preferable.

The lower limit of the content of the pearl pigment (B) that can be contained in the resin molded article of the present invention is 0.05 with respect to 100% by mass of the resin molded article, since the heat ray shielding property of the resin molded article is improved. It is preferably at least 0.1 mass %, even more preferably at least 0.2 mass %. On the other hand, the upper limit of the content of the pearl pigment (B) is 3.0% by mass or less with respect to 100% by mass of the resin molding, since the transparency and hiding property of the resin molding can be maintained satisfactorily. It is preferably 2.0% by mass or less, more preferably 1.0% by mass or less.
The above upper and lower limits can be combined arbitrarily. For example, the content of the pearl pigment (B) contained in the resin molding of the present invention is preferably 0.05% by mass or more and 3.0% by mass or less with respect to 100% by mass of the resin molding, and 0.1% by mass. % or more and 2.0 mass % or less is more preferable, and 0.2 mass % or more and 1.0 mass % or less is even more preferable.

In the resin molded article of the present invention, the content of the pearl pigment (B) per unit area (unit: m ² ) in the projected area of the resin molded article (hereinafter referred to as "the content of the pearl pigment (B) per unit area ) is preferably 1.00 g/m ² or more because the heat ray shielding property of the resin molding is improved. 2.00 g/m ² or more is more preferable, and 3.00 g/m ² or more is even more preferable. On the other hand, the upper limit of the content is preferably 60.00 g/m ² or less because the transparency and low colorability of the resin molding can be maintained satisfactorily. 40.00 g/m ² or less is more preferable, and 20.00 g/m ² or less is even more preferable. The above upper and lower limits can be combined arbitrarily.
Alternatively, the content of the pearl pigment (B) per unit area of the resin molding of the present invention is preferably 1.00 g/m ² or more and 60.00 g/m ² or less. 2.00 g/m ² or more and 40.00 g/m ² or less is more preferable, and 3.00 g/m ² or more and 20.00 g/m ² or less is even more preferable.
In the present invention, the projected area of the resin molded body is the area when the resin molded body is projected onto a plane, that is, the two-dimensional planar area when the resin molded body is viewed from a direction substantially perpendicular to the main plane. . When the main plane of the resin molded article has a curved surface shape or a complicated concave-convex shape, the projected area of the resin molded article is smaller than the developed area of the actual molded article.
Further, when the projected area of the resin molding is small, for example, the content of the pearl pigment (B) per square centimeter may be converted to the content of the pearl pigment (B) per square meter.

The resin molded article of the present invention can contain general compounding agents, if necessary. Compounding agents include, for example, solvents, stabilizers, lubricants, processing aids, plasticizers, impact resistance aids, foaming agents, fillers, antibacterial agents, antifungal agents, foaming agents, release agents, antistatic agents, Colorants, matting agents, UV absorbers and thermoplastic polymers may be mentioned.

Examples of the shape of the resin molded article of the present invention include a plate-like molded article (resin plate). The thickness of the resin plate is not particularly limited, but may be from 0.2 mm to 15 mm, preferably from 0.3 mm to 5 mm.

<Transparent resin (A)>
The transparent resin (A) is one of the components constituting the resin molded article of the present invention.
The transparent resin (A) is not particularly limited as long as it has a high light transmittance at least in the visible light region, and known transparent resins can be used. Specific examples of known transparent resins include at least one selected from known methacrylic resins, known polycarbonate resins, and known polystyrene resins. These transparent resins are preferable because, when used in combination with the pearl pigment (B), the resin molded product has excellent heat ray shielding properties, moderate transparency, and moderate hiding power. Among them, methacrylic resins are particularly preferred.

(methacrylic resin)
The methacrylic resin that can be used as the transparent resin (A) in the present invention is not particularly limited. (hereinafter abbreviated as "other monomer") and a copolymer (hereinafter abbreviated as "MMA copolymer"), which is a repeating unit derived from MMA (hereinafter abbreviated as "MMA unit ) is preferably 70% by mass or more and less than 100% by mass of the total mass of the MMA copolymer.
It is also possible to crosslink the methacrylic resin with a known copolymerizable crosslinkable monomer.

The other monomers are not particularly limited as long as they are copolymerizable with MMA. Examples of the above other monomers include methyl acrylate, ethyl (meth) acrylate, (meth) acrylic acid esters having an alkyl group having 1 to 8 carbon atoms such as n-butyl (meth) acrylate, styrene, aromatic vinyl monomers such as α-methylstyrene; and vinyl cyanide monomers such as acrylonitrile and methacrylonitrile.
The methacrylic resin can be produced by using the method for producing a resin molding described below. Specific examples thereof include methacrylic resins produced using a known casting polymerization method such as a cell casting method or a continuous casting method.
Alternatively, commercially available methacrylic resins include ACRYPET (registered trademark) VH, MD, MF, IRK304, and VRL40 (all trade names, manufactured by Mitsubishi Chemical Corporation).

(polycarbonate resin)
The polycarbonate resin that can be used as the transparent resin (A) in the present invention is obtained, for example, by reacting a known dihydric phenol and a known carbonylating agent by an interfacial polycondensation method, a melt transesterification method, or the like. those obtained by polymerizing known carbonate prepolymers by a solid-phase transesterification method; and those obtained by polymerizing known cyclic carbonate compounds by a ring-opening polymerization method.
Commercially available polycarbonate resins include Panlite series (trade name, manufactured by Teijin Chemicals), Iupilon series (trade name, manufactured by Mitsubishi Engineering-Plastics), SD Polyca series (trade name, manufactured by Sumitomo Dow), Caliber (trade name). Dow Chemical Company), CZ series and PCZ series (trade name, Mitsubishi Gas Chemical Company), APEC series (trade name, Bayer), and the like.

(polystyrene resin)
The polystyrene resin that can be used as the transparent resin (A) in the present invention is a homopolymer of styrene (hereinafter abbreviated as "St") or a repeating unit derived from St (hereinafter abbreviated as "St unit"). ) is 50% by mass or more and less than 100% by mass with respect to the total mass of the polystyrene resin.
Specific examples of polystyrene resins include polystyrene, styrene-acrylonitrile resins, acrylonitrile-butadiene-styrene resins, and methyl methacrylate-styrene resins (MS resins). Methyl methacrylate-styrene resin is preferred.
Commercially available polystyrene products include PSJ polystyrene and ET series (trade name, manufactured by PS Japan Co., Ltd.).
Examples of commercially available MS resins include Estyrene MS series (trade name, manufactured by Nippon Steel & Sumikin Chemical Co., Ltd.), Sebian MAS series, and MAS series (trade name, manufactured by Daicel Polymer Ltd.).

<Pearl pigment (B)>
The resin molding of the present invention contains a pearl pigment (B) as one of its constituent components.

By containing the pearl pigment (B), the resin molded article of the present invention exhibits an unexpected effect of being excellent in heat ray shielding properties and having moderate transparency and moderate hiding power.

Examples of the pearl pigment (B) in the present invention include glittering flaky fine particles having a surface with a pearly color tone.

The pearl pigment (B) in the present invention contains metal oxide-coated mica because the resin molding has excellent heat ray shielding properties, and has moderately excellent transparency and moderately excellent hiding properties. is preferred.

In the metal oxide-coated mica, the resin molded article has excellent heat ray shielding properties, and has moderately excellent transparency and moderately excellent hiding properties, so the surface is made of metal and / or metal oxide. It preferably contains coated mica. Among them, mica whose surface is coated with titanium oxide and/or iron oxide is preferable, and it is more preferable to include mica whose surface is coated with titanium oxide.

Specific examples of the pearl pigment (B) in the present invention include TWINCLEPEARL (registered trademark) BXD, RXD, VXD, RXB, and RXC-S0 manufactured by Nihon Koken Kogyo Co., Ltd., and Iriodin (registered trademark) manufactured by Merck. ) 223WNT and other commercially available products can be used. These can be used alone or in combination of two or more.

In the pearl pigment (B) in the present invention, if the lower limit of the particle size (D ₉₀ ) at which the cumulative frequency is 90% in the particle size cumulative frequency distribution curve is 22.0 μm or more, the resin molded product has heat ray shielding properties. It has superior and moderately superior transparency and moderately superior hiding power. 26.0 μm or more is more preferable, and 30.0 μm or more is even more preferable. On the other hand, when the upper limit of the particle size (D ₉₀ ) is 41.0 μm or less, the heat ray shielding property and hiding property of the resin molding can be maintained satisfactorily. 39.0 μm or less is more preferable, and 38.0 μm or less is even more preferable.
The above upper and lower limits can be combined arbitrarily. For example, the particle size (D ₉₀ ) at which the cumulative frequency of the pearl pigment (B) in the present invention is 90% is preferably 22.0 μm or more and 41.0 μm or less, more preferably 26.0 μm or more and 39.0 μm or less. 0 μm or more and 38.0 μm or less is more preferable.

If the lower limit of the particle size (D ₅₀ ) at which the pearl pigment (B) has a cumulative frequency of 50% in the particle size cumulative frequency distribution curve is 12.0 μm or more, the resin molded product has excellent heat ray shielding properties. And, it has more moderately excellent transparency and more moderately excellent hiding power. 14.5 μm or more is more preferable, and 16.8 μm or more is even more preferable. On the other hand, if the upper limit of the particle size ( _D50 ) is 23.0 μm or less, the heat ray shielding property and hiding property of the resin molding can be maintained satisfactorily. 22.0 μm or less is more preferable, and 21.0 μm or less is even more preferable.
The above upper and lower limits can be combined arbitrarily. For example, the particle size (D ₅₀ ) at which the cumulative frequency of the pearl pigment (B) in the present invention is 50% is preferably 12.0 μm or more and 23.0 μm or less, more preferably 14.5 μm or more and 22.0 μm or less. 0.8 μm or more and 21.0 μm or less is more preferable.

The pearl pigment ( _B ) _{has a ratio (D 90 /} If the lower limit of D ₁₀ ) is 3.3 or more, the resin molded product has excellent heat ray shielding properties, moderately excellent transparency, and moderately excellent hiding properties. 3.4 or more is more preferable, and 3.5 or more is even more preferable. On the other hand, although the upper limit of the ratio (D ₉₀ /D ₁₀ ) is not particularly limited, it is usually 5.0 or less. 4.5 or less is more preferable, and 4.0 or less is even more preferable.
The above upper and lower limits can be combined arbitrarily. For example, in the cumulative frequency distribution curve of the particle size of the pearl pigment (B) in the present invention, the ratio of the particle size (D ₉₀ ) at which the cumulative frequency is 90% and the particle size (D ₁₀ ) at which the cumulative frequency is 10% ( D ₉₀ /D ₁₀ ) is preferably 3.3 to 5.0, more preferably 3.4 to 4.5, even more preferably 3.5 to 4.0.

<Method for manufacturing resin molding>
When the transparent resin (A) is the methacrylic resin, a known casting polymerization method such as a cell casting method or a continuous casting method can be used as the method for producing the resin molding of the present invention.
In the casting polymerization method, the outer periphery of two inorganic glass plates or metal plates (SUS plates) arranged opposite to each other is sealed with a gasket such as a soft resin tube, and this is used as a mold, followed by polymerization to be described later. A sheet-shaped resin composition is formed by injecting the raw material into the mold and polymerizing it. Next, the obtained resin composition is peeled off from the mold to obtain a plate-shaped resin molding.

The form of the mold for casting polymerization is not particularly limited, and any known mold can be used. Examples include molds for cell casting and molds for continuous casting.
As a mold for cell casting, for example, two plate-like bodies such as an inorganic glass plate, a chromium-plated metal plate, or a stainless steel plate are arranged facing each other at a predetermined interval, and a gasket is arranged on the edge of the plate-shaped body. and a gasket to form a sealed space.
As a mold for continuous casting, for example, a pair of endless belts running in the same direction at the same speed face each other, and gaskets running at the same speed as the endless belt on both sides of the endless belt form a sealed space. Those that have been made

The polymerization method in the case of using the casting polymerization method is not particularly limited, and for example, a known polymerization method used for producing methacrylic resins and styrene resins can be employed. Specifically, a so-called bulk polymerization method (mass polymerization method) using a monomer as a polymerization solvent can be performed using known radical polymerization conditions.

When polymerizing using a cast polymerization method, the following steps (1) to (3) can be performed in order.
Step (1): A polymerizable raw material obtained by adding a pearl pigment (B) to a monomer raw material containing methyl methacrylate as a main component is injected into a reaction vessel, and the reaction vessel is introduced into a polymerization apparatus.
Step (2): The polymerizable raw material in the reaction vessel is heated to a temperature range of 50°C or higher and 100°C or lower in a first heating region in a polymerization apparatus, and heated to 100°C or higher in a second heating region. Polymerization is performed by heating to a temperature range of 150° C. or less to obtain a polymer.
Step (3): The obtained polymer is taken out from the reaction vessel to obtain the resin molding of the present invention.

Alternatively, when the transparent resin (A) is at least one selected from methacrylic resins, polycarbonate resins and polystyrene resins, a known melt-kneading method such as injection molding, extrusion molding, calendar molding, etc. The pearl pigment (B) may be mixed with the methacrylic resin while taking care that the pearl pigment (B) is not decomposed or denatured by heating during the molding process to impair the heat ray shielding properties.

<Polymerizable raw material>
The polymerizable raw material is a raw material for the resin molding of the present invention.
When the transparent resin (A) is a methacrylic resin, the polymerizable raw material is a polymerizable raw material obtained by adding the pearl pigment (B) to a monomer raw material containing methyl methacrylate as a main component.
As the polymerizable raw material, specifically, a mixture of a single substance of methyl methacrylate, a pearl pigment (B) and a known polymerization initiator, or 70% by mass or more and less than 100% by mass of methyl methacrylate and other monomers described above A mixture of a monomer composition containing more than 0% by mass and 30% by mass or less of a monomer, a pearl pigment (B), and a known polymerization initiator can be used.
In addition, as a known polymerization initiator, a known azo initiator or a peroxide initiator used for producing a methacrylic resin can be used.

The thickness of the resin molding of the present invention is not particularly limited, but may be 0.2 mm to 15 mm, preferably 0.3 mm to 5 mm.

The present invention will be described below using examples. In the following, "parts" and "%" indicate "mass parts" and "mass%" respectively. Abbreviations of compounds used in Examples and Comparative Examples are as follows.
MMA: methyl methacrylate AVN: 2,2′-azobis(2,4-dimethylvaleronitrile) (trade name: V-65, manufactured by FUJIFILM Wako Pure Chemical Industries, Ltd.)
HPP: t-hexyl peroxypivalate (trade name: Perhexyl PV, manufactured by NOF Corporation)

As the pearl pigment (B), the following were used. Table 1 shows the particle size (D ₉₀ , D ₅₀ , D ₁₀ ) of each pearl pigment (B).
Pearl pigment (B-1): mica coated with titanium oxide (trade name: TWINCLEPEARL (registered trademark) BXD, manufactured by Nihon Koken Kogyo Co., Ltd.)
Pearl pigment (B-2): mica coated with titanium oxide (trade name: TWINCLEPEARL (registered trademark) RXD, manufactured by Nihon Koken Kogyo Co., Ltd.)
Pearl pigment (B-3): mica coated with titanium oxide (trade name: TWINCLEPEARL (registered trademark) VXD, manufactured by Nihon Koken Kogyo Co., Ltd.)
Pearl pigment (B-4): mica coated with titanium oxide (trade name: TWINCLEPEARL (registered trademark) RXB, manufactured by Nihon Koken Kogyo Co., Ltd.)
Pearl pigment (B-5): mica coated with titanium oxide (trade name: TWINCLEPEARL (registered trademark) RXC-S0, manufactured by Nihon Koken Kogyo Co., Ltd.)
Pearl pigment (B-6): mica coated with titanium oxide (trade name: Iriodin (registered trademark) 223WNT, manufactured by Merck)
Pearl pigment (B-7): mica coated with titanium oxide (trade name: Iriodin (registered trademark) 121WNT, manufactured by Merck)
Pearl pigment (B-8): mica coated with titanium oxide (trade name: Iriodin (registered trademark) 2123SW, manufactured by Merck)
Pearl pigment (B-9): mica coated with titanium oxide (trade name: TWINCLEPEARL (registered trademark) RXE, manufactured by Nihon Koken Kogyo Co., Ltd.)
Pearl pigment (B-10): mica coated with titanium oxide (trade name: Iriotec (registered trademark) 9770, manufactured by Merck)
Pearl pigment (B-11): mica coated with titanium oxide (trade name: Iriotec (registered trademark) 9870, manufactured by Merck)

<Evaluation method>

(1) Particle size (D ₉₀ , D ₅₀ , D ₁₀ ) of pearl pigment (B)
Using a nanoparticle size distribution measuring device (manufactured by Shimadzu Corporation, model name: SALD-7100), according to JIS Z 8825-1, the pearl pigment (B) is dispersed in deionized water. A volume average particle size of the pearl pigment (B) in the range of 10 nm to 300 μm was measured. The volume average particle size was calculated with the refractive index of the pearl pigment (B) being 2.35. The concentration of the pearl pigment (B) in the aqueous dispersion was set to 1000 ppm.
Next, the measurement range of 10 nm to 300 μm was divided into 50 sections, and the frequency ratio (unit: %) of each section was calculated to create a frequency distribution curve of the volume average particle size. Next, a cumulative frequency distribution curve is created from the frequency distribution curve, D ₉₀ is the particle diameter at which the cumulative frequency is 90%, D ₅₀ is the particle diameter at which the cumulative frequency is 50%, and particles at which the cumulative frequency is 10% The diameter was taken as _D10 . The ratio of _D90 to _{D10 (D90 / D10} ) was calculated.

(2) Total light transmittance As an indicator of transparency, the total light transmittance of a test piece (thickness 3 mm) of a resin molding was measured according to JIS K7375.
Furthermore, it was determined using the following criteria.
A: Total light transmittance of 55% or more B: Total light transmittance of 40% or more and less than 55% C: Total light transmittance of less than 40%

(3) Diffusivity As an index of diffusivity, a variable angle photometer (manufactured by Murakami Color Research Laboratory, model name: GP-200) is used, and a test piece (thickness 3 mm) of a resin molded body is irradiated with light at 0 °. was incident on the sample, the luminance values of the transmitted light were measured at angles of 5°, 20°, and 70° with respect to the sample, and the diffusivity was calculated.
Furthermore, it was determined using the following criteria.
A: Spreading rate of 12% or more B: Spreading rate of 3.0% or more and less than 12% C: Spreading rate of less than 3.0%

(4) Solar reflectance, solar absorptance, solar shielding coefficient Using a spectrophotometer (manufactured by Hitachi, Ltd., model name: U-4100) as an index of heat ray shielding, the resin molded body is measured in accordance with ISO 9050. Solar reflectance (unit: %), solar absorptivity (unit: %), solar transmittance (unit: %), and solar heat gain rate (Solar Heat Gain Coefficient, unit: W/(m ² ·K)) was measured.

The solar reflectance and solar transmittance were measured by irradiating the measurement light at an angle of 10° with respect to the normal line of the test piece of the resin molding, and measuring the diffuse reflection generated at this time with an integrating sphere having a diameter of 60 mm. It was detected and calculated according to the calculation method described in ISO9050 using the weight coefficient at the measurement wavelength of 300 nm to 2500 nm specified in the standard. Light in the solar wavelength range was used as measurement light.

In addition, the solar absorptance is obtained from the obtained solar reflectance and solar transmittance as follows:
Solar absorptance (%) = 100 - solar reflectance (%) - solar transmittance (%)
Calculated by
Furthermore, it was determined using the following criteria.
A: The sum of solar absorptivity and solar reflectance is 70% or more B: The sum of solar absorptance and solar reflectance is 63% or more and less than 70% C: The sum of solar absorptance and solar reflectance is less than 63%

In addition, the solar heat gain rate is obtained from the obtained solar absorptance and solar transmittance, with the heat transfer resistance being 0.276122921,
Solar heat gain rate (W/(m ² · K)) = (solar transmittance (%) + solar absorptivity (%) x heat transfer resistance)/100
Calculated by

In addition, the solar radiation shielding coefficient is calculated from the obtained solar heat gain rate as follows:
Solar shading coefficient = solar heat gain rate/0.88
Calculated by
Furthermore, it was determined using the following criteria.
A: Solar radiation shielding coefficient is 0.40 or more B: Solar radiation shielding coefficient is 0.35 or more and less than 0.40 C: Solar radiation shielding coefficient is less than 0.35

(5) Diffusivity As an index of light diffusivity, a goniophotometer (manufactured by Murakami Color Research Laboratory, model name: GP-200) is used, and a test piece (thickness When the light was incident on the sample at 0°, the luminance values of the transmitted light were measured at angles of 5°, 20°, and 70° with respect to the sample, and the diffusivity was calculated.
Furthermore, it was determined using the following criteria.
A: Spreading factor is 3.0 or more and 10 or less B: Spreading factor is over 10 and 60 or less C: Spreading factor is less than 3.0 or over 60

[Example 1]
(1) Production of Syrup 100 parts by mass of MMA was supplied to a reactor (polymerization pot) equipped with a cooling pipe, a thermometer and a stirrer, stirred for 15 minutes while bubbling nitrogen gas, and then stirred until the temperature reached 60°C. heated up. Next, 0.1 part by mass of AVN was added as a radical polymerization initiator, and the monomer composition was heated to 100° C. with stirring and then held for 13 minutes. Then, the reactor was cooled until the internal temperature reached room temperature to obtain a syrup. The polymer content in the syrup was 20% by weight.
(2) Casting polymerization To 92 parts by mass of the above syrup, 8 parts by mass of MMA, 0.25 parts by mass of pearl pigment (B-1) as pearl pigment (B), and 0.4 parts by mass of HPP as a polymerization initiator are stirred. It was added while stirring, and dissolved to obtain a polymerizable composition.
A soft resin gasket was installed at the ends of two SUS plates arranged to face each other so that the gap between the two SUS plates was 4.1 mm to prepare a mold. Next, after pouring the polymerizable composition into the above mold, it was sealed with a soft resin gasket, heated to 80 ° C. and held for 40 minutes, then heated to 130 ° C. and held for 30 minutes. It was held for 1 minute to polymerize the polymerizable composition. After that, it was cooled to room temperature, and the SUS plate was removed to obtain a plate-shaped resin molding having a thickness of 3.0 mm. The content of the pearl pigment (B) per unit area of the resin molding was 6.25 (g/m ² ). Table 2 shows the evaluation results of the resin moldings.

[Examples 2 to 6, Comparative Examples 1 to 8]
A resin molding was obtained in the same manner as in Example 1, except that the type or content per unit area of the pearl pigment (B) was changed as shown in Table 2. Table 2 shows the evaluation results of the resin moldings.

The resin moldings of Examples 1 to 6 were excellent in heat ray shielding properties and had moderate transparency and moderate hiding power.

The resin molded bodies of Comparative Examples 1 to 4 have a small particle size (D ₉₀ ) at which the cumulative frequency is 90% and a small particle size (D ₅₀ ) at which the cumulative frequency is 50% in the cumulative frequency distribution curve of the particle size. The heat ray shielding property and transparency were insufficient.

The resin molded bodies of Comparative Examples 5 to 8 have a large particle size (D ₉₀ ) at which the cumulative frequency is 90% and a particle size (D ₅₀ ) at which the cumulative frequency is 50% in the cumulative frequency distribution curve of the particle size. Insufficient heat ray shielding and hiding properties.

Since the resin molded article of the present invention has excellent heat ray shielding properties, moderate transparency, and moderate shielding properties, it can be used for heat ray shielding plates, roofing materials, window materials, and lighting used in buildings, automobiles, trains, or buses. , can be suitably used for protective materials used for signboards.

Claims (15)

Contains a transparent resin (A) and a pearl pigment (B),
A resin molded product, wherein the pearl pigment (B) has a particle size (D 90 ) at which the cumulative frequency is 90% in a cumulative frequency distribution curve of particle size (D ₉₀ ) of 22.0 μm or more and 41.0 μm or less. 2. The resin molding according to claim 1, wherein the pearl pigment (B) has a particle diameter (D50) at which the cumulative frequency is 50% in a cumulative frequency distribution curve of particle diameters ( _D50 ) of 12.0 μm or more and 23.0 μm or less. . The pearl pigment ( _B ) _{has a ratio (D 90 /} 3. The resin molding according to claim ₁ , wherein D10) is 3.3 or more. Contains a transparent resin (A) and a pearl pigment (B),
Total light transmittance is 40% or more,
The sum of the solar reflectance and the solar absorptance is 63% or more,
Resin molding. 5. The resin molding according to claim 4, wherein the diffusion coefficient is 3.0 or more and 60 or less. 6. The resin molding according to claim 4, wherein the solar radiation shielding coefficient is 0.35 or more and 0.70 or less. Any one of claims 4 to 6, wherein the pearl pigment (B) has a particle diameter (D 90 ) at which the cumulative frequency is 90% in the cumulative frequency distribution curve of particle diameters (D ₉₀ ) of 22.0 µm or more and 41.0 µm or less. The resin molded article according to Item 1. 8. Any one of claims 4 to 7, wherein the pearl pigment (B) has a particle size (D 90 ) at which the cumulative frequency is 50% in a cumulative frequency distribution curve of particle size (D ₉₀ ) of 12.0 μm or more and 23.0 μm or less. The resin molded article according to Item 1. The resin molding according to any one of claims 1 to 8, wherein the pearl pigment (B) contains metal oxide-coated mica. 10. The resin molding according to claim 9, wherein the metal oxide-coated mica contains mica coated with titanium oxide. 11. The content of the pearl pigment (B) per unit area in the projected area of the resin molding is 1.00 g/m ² or more and 60.00 g/m ² or less, according to any one of claims 1 to 10. The resin molded article according to Item 1. The resin molding according to any one of claims 1 to 11, wherein the transparent resin (A) is a methacrylic resin. A heat ray shielding plate comprising the resin molding according to any one of claims 1 to 12. A roofing material comprising the resin molding according to any one of claims 1 to 12. A window material comprising the resin molding according to any one of claims 1 to 12.