WO2015122401A1

WO2015122401A1 - Rain gutter

Info

Publication number: WO2015122401A1
Application number: PCT/JP2015/053619
Authority: WO
Inventors: 裕卓小林; 英明西村; 隆廣土佐; 慎一高木; 憲一塚本
Original assignee: 電気化学工業株式会社
Priority date: 2014-02-12
Filing date: 2015-02-10
Publication date: 2015-08-20
Also published as: JP6473701B2; JPWO2015122401A1; TW201537004A

Abstract

[Problem] To provide a high-performance structure for a building that has excellent stain-resistance to prevent staining from rain, air-borne dust particles, or the like, and that does not experience thermal deformation or thermal expansion/contraction nor discoloration or fading due to ultraviolet light. [Solution] A structure for a building is characterized in that: the structure has a base part; a resin covering layer containing at least a fluorine-based resin is formed on a portion or the entirety of the base part; and the surface roughness of the resin covering layer is no more than 0.2 when calculated according to mean roughness (Sa) (μm).

Description

Rain gutter

The present invention relates to rain gutters.

Materials used for building structures vary depending on the type and application, such as resin, metal, and concrete, but they are lightweight, have good weather resistance, are inexpensive, and are easy to form in various designs. In many cases, a resin material is used. There are various types of resin materials, but hard vinyl chloride resins are often used in rain gutters, for example. Rain gutters are divided into eaves that receive rainwater from the roof and eaves that send rainwater from the eaves to the sewage.

Rain gutters made of vinyl chloride resin have the problem of fading during use. In recent years, rain gutters have been made of styrenic copolymers in order to suppress the fading properties of the hail molded products. Have been used (for example, disclosed in Japanese Patent Application Laid-Open No. 2001-140420). In addition, those composed of a composite material in which a styrene copolymer layer is laminated on a vinyl chloride resin layer are also used.

Various shapes of eaves are manufactured in consideration of the purpose and place of use, or the appearance and design of the appearance. In general eaves bowls, in order to prevent deformation and breakage, the ears are provided at the front and rear upper ends of the eaves bowls to improve the strength. The ears also serve to fix the eaves to the eaves of the building by locking to the eaves support metal fittings. As one of these eaves ridges, an eave ridge formed by projecting inwardly the ear portion at the upper end of the front plate is used.

In addition, in order to solve the problem of large deformation by being eroded by the solvent contained in the vinyl chloride resin used when connecting the eaves and the connection joint, and for the purpose of further improving the weather resistance itself as a rain gutter, A material in which the outer surface of the eaves is coated with a weather resistant resin such as acrylonitrile, acrylic rubber, styrene copolymer (ASA) or the like is also used (for example, disclosed in Japanese Patent Application Laid-Open No. 2004-190223). )

On the other hand, since the eaves are attached to the eaves of the building and used, the residents' interest in the exterior of the building has increased, and in recent years there has been a demand for white eaves attached to light-colored buildings. As it has become stronger, it has been demanded that dirt on the eaves by dust and rainwater in the atmosphere is less noticeable than ever.

However, the weather-resistant resin covering the outer surface of the eaves is provided mainly to solve the problems of discoloration, fading, thermal deformation and thermal expansion due to ultraviolet rays. The performance for preventing contamination due to the above is not sufficient at present.

In view of the above problems, the present invention provides a rain gutter that has good antifouling properties, is less likely to be contaminated by dust or rainwater in the atmosphere, and has no discoloration, fading, thermal deformation, or thermal expansion / contraction due to ultraviolet rays. For the purpose.

The present invention has a base material part, a resin coating layer containing at least a fluororesin is formed on the entire outer surface or a part of the outermost surface, and the surface roughness of the resin coating layer is such that the plane direction is the X axis Y axis, When the vertical direction is the Z axis, the measurement length in each plane direction when the measurement area of the surface is arbitrarily set is Lx, Ly, and the surface shape curve is z = f (x, y), the following formula ( A rain gutter characterized by having an arithmetic average roughness Sa (μm) represented by 1) of 0.2 or less.

In one embodiment of the present invention, the rain gutter has a polyvinylidene fluoride content of 45 masses when the fluororesin of the resin coating layer is polyvinylidene fluoride and the total resin amount is 100 parts by mass. Or more.

In one embodiment of the present invention, the rain gutter includes an acrylic resin in the resin coating layer.

In one embodiment of the present invention, the rain gutter has at least one intermediate resin layer between the base material portion and the resin coating layer, and the intermediate resin layer has a total resin amount of 100 parts by mass. In this case, the acrylic resin content is 50 to 100 parts by mass, and the fluorine resin content is 0 to 50 parts by mass.

In one embodiment of the present invention, the rain gutter described above is characterized in that the resin coating layer contains 1.0 to 6.0 parts by mass of an inorganic pigment with respect to 100 parts by mass of the total resin content of the resin coating layer. And

In one embodiment of the present invention, the rain gutter described above is characterized in that the resin coating layer contains 0.01 to 5 parts by mass of an ultraviolet absorber with respect to 100 parts by mass of the total resin content of the resin coating layer. To do.

In one embodiment of the present invention, the rain gutter described above may contain an inorganic pigment in an amount of 1.0 to 6.5 in any one or both of the resin coating layer and the intermediate resin layer with respect to 100 parts by mass of the total resin amount of each layer. It is characterized by containing 0 part by mass.

In one embodiment of the present invention, the rain gutter described above may contain 0.01 to 5 UV absorbers in any one or both of the resin coating layer and the intermediate resin layer with respect to 100 parts by mass of the total resin amount of each layer. It is characterized by containing a mass part.

In one embodiment of the present invention, the rain gutter is characterized in that the base material portion is made of a hard vinyl chloride resin.

ADVANTAGE OF THE INVENTION According to this invention, the rain gutter which has favorable antifouling property, is hard to generate | occur | produce the stain | pollution | contamination by the dust in the atmosphere, rain water, etc., and is free from discoloration, fading, thermal deformation, and thermal expansion / contraction by ultraviolet rays can be provided.

1 is a schematic side view showing an embodiment of an eaves bowl according to the present invention. It is a schematic side view which shows other embodiment of the eaves bowl which concerns on this invention.

FIG. 1 is a schematic side view showing a rain gutter according to an embodiment of the present invention. The eaves cage 1 has at least fluorine on the outer surface of the base material portion including the base material portion 10 and at least the long side 20. The resin coating layer 11 containing a resin is formed. In addition, although this embodiment sets it as the structure by which the resin coating layer 11 was formed only in the long side 20 of the base material part 10, the range which coat | covers the resin coating layer 11 is not limited, for example, a base material The entire circumference of the portion 10 may be covered.

As the resin constituting the base portion, a hard vinyl chloride resin, an acrylic resin, a polycarbonate resin, a polyethylene terephthalate resin, a polyolefin resin, a polyurethane resin, a polystyrene resin, resins modified by these, or a copolymer of these resins Examples thereof include thermoplastic synthetic resins such as resins. Moreover, the base material part etc. which use metals, such as iron and aluminum, glass fiber, carbon fiber, paper material, a filler, etc. as a core material, and coat | cover a synthetic resin on both surfaces are mentioned. In the present invention, a hard vinyl chloride resin is preferable from the viewpoints of light weight, good weather resistance, low cost, and easy formation in various designs, and adhesion from the resin coating layer.

The vinyl chloride resin is a vinyl chloride copolymer containing 50% by weight or more of vinyl chloride with a vinyl chloride homopolymer, vinyl chloride and a monomer copolymerizable with vinyl chloride. Examples of such monomers copolymerizable with vinyl chloride include vinyl esters such as vinyl acetate and vinyl propionate; acrylic acid and methacrylic acid; acrylic acid esters such as methyl acrylate and ethyl acrylate; methacrylic acid Examples thereof include methacrylic acid esters such as methyl and ethyl methacrylate; olefins such as ethylene and propylene; acrylonitrile; styrene; vinylidene chloride.

The viscosity average polymerization degree of the vinyl chloride resin is in the range of 500 to 3,000, more preferably 700 to 1,500. If the viscosity average polymerization degree is less than 500, the resulting rain gutter may be inferior in mechanical properties such as impact strength, tensile strength, and elongation. On the other hand, when the viscosity average polymerization degree exceeds 3,000, the melt viscosity of the vinyl chloride resin at the time of molding becomes high, which may make molding difficult. If the molding temperature is raised to lower the melt viscosity, the vinyl chloride resin may be decomposed and a good rain gutter may not be obtained. The viscosity average degree of polymerization is obtained by dissolving 200 mg of resin in 50 ml of nitrobenzene, measuring the specific viscosity of this polymer solution in a constant temperature bath at 30 ° C. using an Ubbelohde viscometer, and calculating according to JIS K6720-2.

Hard vinyl chloride resins include inorganic fillers such as calcium carbonate and wollastonite, thermal stabilizers for PVC such as tin and lead, stabilization aids such as epoxidized soybean oil, paraffin wax and polyethylene wax It is possible to add a lubricant such as acrylic, a processing aid such as acrylic, an antioxidant such as phenol, a light stabilizer such as benzotriazole or hindered amine, a pigment, and a plasticizer.

Examples of the resin coating layer 11 containing a fluorine resin include polytetrafluoroethylene, tetrafluoroethylene-hexafluoroethylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-ethylene. A copolymer, polyvinylidene fluoride, and the like can be mentioned, but polyvinylidene fluoride (hereinafter abbreviated as PVDF) is more preferable.

The resin coating layer 11 containing a fluorine resin is more preferably a resin composition containing a fluorine resin, and in particular, a composition of PVDF and an acrylic resin (hereinafter abbreviated as PMMA). preferable. In order to ensure antifouling properties and weather resistance, and adhesion to the base material portion, the blending ratio of PVDF in the composition of PVDF and PMMA is preferably 45 parts by mass or more (PMMA: 55 parts by mass or less), More preferred is 45 to 90 parts by mass (PMMA: 55 to 10 parts by mass), and still more preferred is 50 to 80 parts by mass (PMMA: 50 to 20 parts by mass).

According to the present embodiment, it is possible to provide a rain gutter having good antifouling property, hardly causing dirt due to dust or rainwater in the atmosphere, and having no discoloration, fading, thermal deformation or thermal expansion / contraction due to ultraviolet rays.

FIG. 2 is a schematic side view showing a rain gutter according to another embodiment of the present invention, which is more advantageous than the configuration of FIG. 1 in securing an adhesive force between the base material portion 10 and the resin coating layer 11. It is. In the eaves bowl 2 of FIG. 2, a resin coating layer 11 containing at least a fluororesin is formed on the outer surface of the base material portion including the base material portion 10 and at least the long side 20 via the intermediate resin layer 12. It has a configuration. The resin constituting the base material portion and the resin coating layer containing the fluororesin is the same as the eaves 1 in FIG.

The intermediate resin layer 12 is also a composition of PVDF and PMMA similarly to the resin coating layer 11, but in order to ensure the adhesive force between the substrate 10 and the resin coating layer 11, the PMMA in the composition of PVDF and PMMA The blending ratio is 50 to 90 parts by mass (PVDF: 10 to 50 parts by mass), preferably 60 to 85 parts by mass (PVDF: 15 to 40 parts by mass). A plurality of intermediate resin layers having different compositions may be used in consideration of adhesiveness.

The surface roughness of the resin coating layer of the present invention is defined by the arithmetic average roughness Sa (μm) and is 0.2 or less, preferably 0.005 to 0.195, more preferably 0.02 to 0.00. 125. The arithmetic average roughness Sa (μm) is obtained by extending the arithmetic average roughness Ra (μm) obtained from a two-dimensional cross-sectional profile according to JIS B0601 to three dimensions, and is surrounded by a surface shape curved surface and an average surface. The volume of the part is divided by the measurement area. Specifically, the X axis and the Y axis are defined when the X axis and the Y axis are defined in a direction parallel to the surface, the direction perpendicular to the surface is defined as the Z axis, and the measurement region of the surface is arbitrarily set. When the measurement lengths in the direction are Lx and Ly, respectively, and the surface shape curve is z = f (x, y), the arithmetic average roughness Sa (μm) is expressed by the following equation (1).

Sa (μm) is calculated from three-dimensional profile data obtained by a laser microscope.

The smaller Sa (μm) is, the smoother the surface becomes and the better the antifouling property is. However, when emphasizing the design and landscape as described above, Sa (μm) is 0.2 or less. What is necessary is just to shape | mold a coating layer within the range. On the other hand, if it is a case where antifouling property is made better without worrying about the above design and landscape, Sa (μm) is more preferably 0.01 or less.

The resin coating layer or intermediate resin layer containing a fluorine-based resin preferably contains 1 to 6 parts by mass of an inorganic pigment with respect to 100 parts by mass of the resin component. When the compounding amount of the inorganic pigment is less than 1 part by mass per 100 parts by mass of the resin component, deterioration of the base material due to ultraviolet rays cannot be sufficiently prevented. On the other hand, when the blending amount of the inorganic pigment exceeds 6 parts by mass per 100 parts by mass of the resin component, it is not preferable because the mechanical strength when the coating layer is formed decreases or appearance defects due to poor dispersion increase.

As the inorganic pigment, a white inorganic pigment can be used. The white inorganic pigment preferably has an average particle diameter (median diameter) of 0.1 to 2 μm, more preferably 0.20 to 1 μm, as measured by a laser diffraction apparatus defined in JIS Z8825-2. . Thereby, the dispersibility at the time of melt-kneading becomes favorable, and a resin coating layer with few appearance defects can be obtained.

The material of the white inorganic pigment is not particularly limited, and examples thereof include magnesium oxide, barium sulfate, titanium oxide, basic lead carbonate, and zinc oxide. Among various white inorganic pigments, it is particularly preferable to use rutile crystal titanium dioxide having a large refractive index and coloring power and a small photocatalytic activity.

The white inorganic pigment is preferably titanium oxide having the particle surface coated with alumina and / or silica. As a result, the dispersion of the white inorganic pigment in the coating layer is further improved, and PVDF is prevented from being thermally decomposed by a catalytic action during heat-kneading and film formation in the production of the resin composition, and the film is used outdoors. In this case, it is possible to prevent deterioration of light rays and to ensure weather resistance.

In the resin coating layer and the intermediate resin layer containing a fluororesin, 0.01 to 1 part by mass of a toning inorganic pigment other than white can be used with respect to 100 parts by mass of the resin component. The inorganic pigment for toning is blended to finely adjust the color tone when the coating layer is formed and to improve heat resistance. However, if the blending amount of the inorganic pigment for toning is less than 0.01 parts by mass per 100 parts by mass of the resin component, the coloring power and the heat resistance improvement effect cannot be sufficiently obtained. On the other hand, when the blending amount of the inorganic pigment for toning exceeds 1 part by mass per 100 parts by mass of the resin component, it becomes difficult to uniformly disperse in the resin and the appearance defects of the resin coating layer increase.

The average particle diameter of the inorganic pigment for toning is preferably from 0.1 to 2 μm, more preferably from the viewpoint of having sufficient coloring power and concealing property and suppressing the formation of aggregated particles. 20 to 1 μm. Here, the average particle diameter is a median diameter measured by a laser diffractometer stipulated in JIS Z8825-1.

The inorganic pigment for toning is not particularly limited. For example, several kinds selected from oxides such as chromium, zinc, iron, nickel, aluminum, cobalt, manganese, and copper are dissolved in a solid solution by firing. A composite oxide pigment or the like can be used. Further, one or several complex oxide pigments can be mixed and used.

The inorganic pigment for toning is preferably coated on the surface with a silane coupling agent before blending. In this case, various silane coupling agents can be used. In particular, n-hexylmethoxysilane having a reactive functional group as a hexyl group and a hydrolyzable group as a methoxy group has a drawback when a film is formed. It is effective in suppressing the occurrence.

It is preferable that the resin coating layer and the intermediate resin layer containing the fluororesin contain 0.01 to 5 parts by mass of an ultraviolet absorber with respect to 100 parts by mass of the resin component because of a good balance between weather resistance and mechanical strength. If it is less than 0.01 parts by mass, there is no effect of preventing deterioration due to ultraviolet rays, and if it exceeds 5 parts, appearance defects due to bleed out and coloring due to the ultraviolet absorber itself occur, which is not preferable.

Although a ultraviolet absorber is not specifically limited, In order to have compatibility with resin to be used and to prevent volatilization of a ultraviolet absorber, a high molecular weight thing is preferable. As the ultraviolet absorber, for example, benzotriazole, oxalic acid, benzophenone, hindered amine, and the like can be used. However, use of a benzotriazole is preferable because it shows remarkable weather resistance in a small amount.

As a method for producing the rain gutter of the present invention, a method for forming eaves in which the resin coating layer of the present embodiment is laminated as a coating layer on a resin serving as a base material, It is preferable that the coating resin layer is coated by coextrusion at the tip end portion in the extrusion die with a single screw extruder. At that time, the raw materials may be supplied by using a resin composition prepared by melting and kneading each of the above-mentioned raw materials in an appropriate blending amount. However, the individual raw materials are mixed and directly uniaxially or biaxially extruded. You may shape | mold by supplying to a machine, melt-kneading, and co-extruding through an unusual die.

However, when the melt kneading temperature is less than 150 ° C., the amount of heat necessary for melting the PDVF may be insufficient, and when it exceeds 260 ° C., the PDVF may be thermally decomposed. Therefore, the temperature during melt-kneading is in the range of 150 to 260 ° C.

In the rain gutter of the present invention, by performing sizing at the time of extrusion, the arithmetic average roughness Sa (μm) of the surface of the outermost coating layer can be adjusted to 0.1 or less, and so on. Thus, the surface becomes smooth, the adhesion of water droplets and dirt can be suppressed, and the antifouling property can be improved. In addition, the surface of the coating layer may be smoothed by cold pressing on a mirror surface, or coated by cold pressing on a textured surface within a range where Sa (μm) is 0.2 or less. A chic design and landscape can be created by adding a slight grain on the surface of the layer.

In one embodiment of the present invention, a resin coating layer including a base material portion, including at least a fluororesin is formed on the entire or part of the outermost surface, and the surface roughness of the resin coating layer is X in a plane direction. When the axis Y-axis, the vertical direction is the Z-axis, the measurement length in each plane direction when the surface measurement area is arbitrarily set are Lx, Ly, and the surface shape curve is z = f (x, y) The arithmetic average roughness Sa (μm) represented by the following formula (1) is 0.2 or less, the fluororesin of the resin coating layer is polyvinylidene fluoride, and the total resin amount is 100 parts by mass. The rain gutter is characterized in that the content of polyvinylidene fluoride is 45 parts by mass or more.
Thereby, it is possible to provide a rain gutter having a more complicated shape with better workability.

In one embodiment of the present invention, in the rain gutter, the resin coating layer contains an acrylic resin.
Thereby, the rain gutter which improved the adhesiveness with the base-material part formed with the hard vinyl chloride-type resin can be provided.

In one embodiment of the present invention, the rain gutter has at least one intermediate resin layer between the base material portion and the resin coating layer, and the intermediate resin layer has a total resin amount of 100 parts by mass. The acrylic resin content is 50 to 100 parts by mass, and the fluororesin content is 0 to 50 parts by mass.
Thereby, the rain gutter which improved the adhesiveness with the base-material part formed with the hard vinyl chloride resin more than the invention of Claim 3 can be provided.

In one embodiment of the present invention, in the rain gutter, the resin coating layer contains 1.0 to 6.0 parts by mass of an inorganic pigment with respect to 100 parts by mass of the total resin content of the resin coating layer.
Thereby, it is possible to provide a rain gutter having various colors and rich in design.

In one embodiment of the present invention, in the rain gutter, the resin coating layer contains 0.01 to 5 parts by mass of an ultraviolet absorber with respect to 100 parts by mass of the total resin content of the resin coating layer.
Thereby, the deterioration by the ultraviolet-ray of the base-material part formed with the hard vinyl chloride-type resin can be prevented, and the rain gutter with better weather resistance can be provided.

In one embodiment of the present invention, in the rain gutter described above, an inorganic pigment is added to one or both of the resin coating layer and the intermediate resin layer in an amount of 1.0 to 6.0 with respect to 100 parts by mass of the total resin amount of each layer. Contains part by mass.
Thereby, it is possible to provide a rain gutter having various colors and rich in design.

In one embodiment of the present invention, in the rain gutter, either or both of the resin coating layer and the intermediate resin layer, 0.01 to 5 mass of the ultraviolet absorber is added to 100 mass parts of the total resin amount of each layer. Contains.
Thereby, the deterioration by the ultraviolet-ray of the base-material part formed with the hard vinyl chloride-type resin can be prevented, and the rain gutter with better weather resistance can be provided.

One embodiment of the present invention is characterized in that, in the rain gutter, the base material portion is made of a hard vinyl chloride resin. Thereby, it is possible to provide a rain gutter that is lightweight, has good weather resistance, is inexpensive, can be easily formed in various designs, and has good adhesion to the resin coating layer.

[Example]
Hereinafter, the present invention will be described in more detail with reference to examples. Moreover, these are all illustrative and do not limit the contents of the present invention. The ratios are shown on a mass basis unless otherwise specified.

(1) Hard vinyl chloride resin Hard vinyl chloride resin compound (manufactured by Denki Kagaku Kogyo Co., Ltd., polymerization degree 1100, blended with lead stabilizer) 100 parts of rutile crystal titanium dioxide powder (median diameter) as white inorganic pigment : 0.3 μm) at a ratio of 5 parts by a Henschel mixer, and then extruded at a temperature of 220 ° C. by a TEM-35B extruder (manufactured by Toshiba Machine Co., Ltd.) and pelletized. In addition, based on JISK6874, the melt flow rate of this pellet measured by the temperature of 220 degreeC and the load of 10 kg was 3 g / 10min.

(2) Resin composition for resin coating layer [Preparation of inorganic pigment for toning]
Black inorganic pigment powder composed of chromium, manganese and copper oxide solid solution: 0.8 kg, brown pigment powder composed of zinc, iron, nickel and aluminum oxide solid solution: 1.6 kg, blue pigment powder composed of cobalt aluminate : 0.6 kg was mixed with a dry mixer to produce an inorganic pigment for toning. Next, 0.03 kg of n-hexyltrimethoxysilane was added to a mixed solution of 0.1 mass% acetic acid aqueous solution: 0.3 kg and ethanol: 0.3 kg to prepare a silane coupling agent solution. And the inorganic pigment for toning was prepared to the mixer, and the silane coupling agent solution was dripped and mixed, stirring. After mixing, the product was taken out, dried in a dryer, and then pulverized into a powder. The average particle diameter (median diameter) of the obtained inorganic pigment for toning was 0.3 μm.

[Resin component]
A resin having the following physical properties was used. In addition, MFR (melt flow rate) was measured by the measuring method prescribed | regulated to A method of JISK7210. The average particle size (median diameter) of the pellets is the dry screening test method of JIS K 0069 “Chemical Product Screening Test Method”. The average particle size (median diameter) of the powder is JIS Z 8825-1 “Particle Size”. Analysis—Laser diffraction method—Part 1: Measurement principle ”.

<PVDF (A)>
A polyvinylidene fluoride resin in pellet form having an MFR (temperature: 230 ° C., load: 3.8 kg) of 20 g / 10 min and an average particle diameter (median diameter) of 3 mm.
<PVDF (B)>
A powdered polyvinylidene fluoride resin having an MFR (temperature: 230 ° C., load: 3.8 kg) of 20 g / 10 min and an average particle diameter (median diameter) of 10 μm.
<PMMA>
A polymethyl methacrylate resin having an MFR (temperature: 230 ° C., load: 10 kg) of 9 g / 10 min.

[Preparation of resin composition]
-Resin composition 1
Inorganic pigment for toning: 3 kg and 20 kg of rutile crystal titanium dioxide powder (median diameter: 0.3 μm) as white inorganic pigment were mixed in a mixer. And as a kneading apparatus for resin composition preparation, a screw diameter 30 mm, L / D = 40 twin screw extruder, toning inorganic pigment, white inorganic pigment, PVDF (A), PVDF (B) and PMMA Were melted and kneaded by supplying them at a speed corresponding to the blending ratio of each component with each individual quantitative feeder. Thereafter, a pellet-shaped resin composition was obtained through a strand die having a hole diameter of 3 mm and three holes (this is referred to as “resin composition 1”). The composition of each component of the obtained resin composition 1 is as follows: PVDF (A) is 35 parts, PVDF (B) is 15 parts, PMMA is 50 parts, white inorganic pigment is 5 parts, and the toning inorganic pigment is 1 part.

-Resin composition 2
As a kneading apparatus for preparing the resin composition, a PVDF (A), PVDF (B) and PMMA described in Example 1 and an ultraviolet absorber (in a twin screw extruder having a screw diameter of 30 mm and L / D = 40) ( Benzotriazole type: TINUVIN 234 (manufactured by BASF) was supplied and melted and kneaded with an individual quantitative feeder at a speed corresponding to the blending ratio of each component. Thereafter, a pellet-shaped resin composition was obtained through a strand die having a hole diameter of 3 mm and three holes (this is referred to as “resin composition 2”). The composition of each component of the obtained resin composition 2 was 35 parts for PVDF (A), 15 parts for PVDF (B), 50 parts for PMMA, and 3 parts for the ultraviolet absorber.

-Resin composition 3
As a kneading apparatus for preparing a resin composition, each component of PVDF (A), PVDF (B) and PMMA is fed to a twin screw extruder with a screw diameter of 30 mm and L / D = 40, using individual quantitative feeders. The mixture was supplied at a speed corresponding to the blending ratio and melt kneaded. Thereafter, a pellet-shaped resin composition was obtained through a three-hole strand die having a hole diameter of 3 mm (this is referred to as “resin composition 3”). And the composition of each component of the obtained resin composition 3 was 60 parts of PVDF (A), 20 parts of PVDF (B), and 20 parts of PMMA.

-Resin composition 4
As a kneading apparatus for resin composition preparation, a screw diameter of 30 mm, a L / D = 40 twin screw extruder, PVDF (A), PVDF (B) and PMMA, and an ultraviolet absorber (benzotriazole type), Each of the individual quantitative feeders was supplied and melt-kneaded at a speed corresponding to the blending ratio of each component. Thereafter, a pellet-shaped resin composition was obtained through a three-hole strand die having a hole diameter of 3 mm (this is referred to as “resin composition 4”). And the composition of each component of the obtained resin composition 4 was 15 parts of PVDF (A), 5 parts of PVDF (B), 80 parts of PMMA, and 3 parts of ultraviolet absorbers.

-Resin composition 5
100 parts of a copolymer having a copolymerization ratio of styrene, acrylonitrile, and butyl acrylate of 74/25/1, and 5 parts of rutile crystalline titanium dioxide powder (median diameter: 0.3 μm) as a white inorganic pigment. After mixing with a Henschel mixer in a ratio, the mixture was extruded at a temperature of 220 ° C. with a TEM-35B extruder (manufactured by Toshiba Machine Co., Ltd., twin screw extruder) to form a pellet (this is referred to as resin composition 5).

-Resin composition 6
The resin composition was changed except that the supply rate was changed to 21 parts for PVDF (A), 9 parts for PVDF (B), 70 parts for PMMA, 5 parts for white inorganic pigment, and 1 part for inorganic pigment for toning. A resin composition was obtained in the same manner as the product 1 (this is referred to as a resin composition 6).

[Create gutter]
・ Samples (A1) to (A5)
The substrate resin composition was coextruded with a 65 mmφ biaxial extruder using the resin composition 1 as a coating layer resin with a 50 mmφ single screw extruder, to produce a laminated gutter having the shape of FIG. The thickness of the base part 10 of the rain gutter was about 1.6 mm, and the thickness of the resin coating layer 11 was about 0.15 mm. Moreover, the coating layer with various surface roughness was formed in the sizing process in the case of extrusion. The arithmetic average roughness Sa (μm) was 0.007, 0.089, 0.168, 0.235, and 0.431, respectively. These samples were sequentially designated as (A1) (A2) (A3) (A4) (A5).

・ Samples (B1) to (B5)
The base resin composition was coextruded with a 65 mmφ biaxial extruder and the resin composition 2 as a coating layer resin with a 50 mmφ single screw extruder, to produce a laminated gutter having the shape of FIG. The thickness of the base part 10 of the rain gutter was about 1.6 mm, and the thickness of the resin coating layer 11 was about 0.15 mm. Moreover, the coating layer with various surface roughness was formed in the sizing process in the case of extrusion. The arithmetic average roughness Sa (μm) was 0.009, 0.125, 0.195, 0.269, and 0.331, respectively. These samples were designated as (B1) (B2) (B3) (B4) (B5) in order.

・ Samples (C1) to (C5)
The substrate resin composition was coextruded with a 65 mmφ biaxial extruder, and the resin composition 3 and the resin composition 4 were respectively used with a 50 mmφ single screw extruder, and the resin composition 3 was applied to the resin coating layer. A laminated gutter having the shape of FIG. 2 was prepared so that the product 4 became an intermediate resin layer. The thickness of the base part 10 of the rain gutter was about 1.6 mm, the thickness of the intermediate resin layer 12 was about 0.10 mm, and the thickness of the resin coating layer 11 was about 0.15 mm. In the sizing process during extrusion, coating layers having various surface roughnesses were formed on the outermost layer. The arithmetic average roughness Sa (μm) was 0.005, 0.025, 0.174, 0.209, and 0.531, respectively. These samples were sequentially designated as (C1) (C2) (C3) (C4) (C5).

・ Samples (D1) to (D3)
The substrate resin composition is co-extruded with a 65 mmφ biaxial extruder using the same pellets as the resin composition for the substrate as a coating layer resin with a 50 mmφ single screw extruder. It was created. In FIG. 1, the thickness of the base material part 10 was about 1.6 mm, and the thickness of the resin coating layer 11 was about 0.15 mm. Moreover, the coating layer with various surface roughness was formed in the sizing process in the case of extrusion. The arithmetic average roughness Sa (μm) was 0.008, 0.054, and 0.223, respectively. These samples were designated as (D1), (D2), and (D3) in order.

・ Samples (E1) to (E3)
The substrate resin composition was coextruded with a 65 mmφ biaxial extruder and the resin composition 5 as a coating layer resin with a 50 mmφ single screw extruder, to produce a laminated gutter having the shape of FIG. In FIG. 1, the thickness of the base material part 10 was about 1.6 mm, and the thickness of the resin coating layer 11 was about 0.15 mm. Moreover, the coating layer with various surface roughness was formed in the sizing process in the case of extrusion. The arithmetic average roughness Sa (μm) was 0.004, 0.094, and 0.192, respectively. These samples were sequentially designated as (E1), (E2), and (E3).

・ Samples (F1) to (F3)
Except for using the resin composition 6 instead of the resin composition 1 as the resin for the coating layer, co-extrusion is performed in the same manner as the samples (A1) to (A5), and the arithmetic average roughness Sa ( Samples with μm) of 0.003, 0.059, and 0.134 were prepared. These samples were sequentially designated as (F1), (F2), and (F3).

[Measurement of surface roughness]
The surface arithmetic average roughness Sa (μm) in the resin coating layer of the rain gutter prepared was obtained by using a laser microscope LEXT OLS4100 (manufactured by OLYMPUS) to obtain a three-dimensional surface shape at a magnification of 50, from which a cut-off λc value was obtained. Sa (μm) was calculated at 80 μm. Table 1 shows the surface arithmetic average roughness Sa (μm) of each gutter.

[Outdoor exposure test]
The rain gutter samples (A) to (F) obtained as described above were exposed to the south for three months from June 1 to August 31 in the summer season to summer. The place exposed outdoors had a parking lot with gravel on the ground in the immediate vicinity, the wind was strong, and the environment was very strongly affected by dirt and dust. Moreover, the installation position was about 1 m from the ground, which was lower than when installed at the eaves of an actual building, and the test was performed in a harsh environment that is much more easily contaminated than usual. Visual appearance change was evaluated before and after the outdoor exposure test. Moreover, the appearance evaluation of dirt was performed by measuring the lightness difference ΔL value. Lightness measurement was performed using CM-508d manufactured by Minolta. It shows that it is dirty, so that the value of difference (DELTA) L before and behind a test is large. The evaluation results are shown in Table 1.

[Examples 1 to 9, Comparative Examples 1 to 15]
As a result of outdoor exposure, among samples made of the resin composition according to the present invention, the arithmetic average roughness Sa (μm) of the outermost coating layer surface is 0.1 or less (A1), (A2), (A3) , (B1), (B2), (B3), (C1), (C2), and (C3) all have a small degree of appearance stains, and a lightness difference ΔL value of −3.0 or more. The soiling showed good results. Among them, it was found that (A1), (B1), and (C1) having an arithmetic average roughness Sa (μm) of 0.01 or less have very good antifouling properties with almost no dirt. On the other hand, the arithmetic average roughness Sa (μm) exceeds 0.1 (A4), (A5), (B4), (B5), (C4), and (C5) samples have a large degree of appearance stains. Good antifouling property was not obtained. In addition, for the (D), (E), and (F) samples prepared for comparison, the degree of soiling of the appearance is all the same regardless of whether the arithmetic average roughness Sa (μm) is 0.2 or less. Big and antifouling was not good.

In addition, thermal deformation and thermal expansion / contraction caused by solar heat were not particularly problematic for the four samples (A), (B), (C), and (E), but the sample (D) was confirmed to have a slight thermal deformation. .

From these, it has the base material part formed with hard vinyl chloride resin, consists of the resin composition which concerns on this invention, and arithmetic mean roughness Sa (micrometer) of the outermost coating layer surface is 0.2 or less. Thus, it is possible to provide a high-performance rain gutter having good antifouling properties, hardly causing dirt due to dust or rainwater in the atmosphere, and having no discoloration, fading, thermal deformation or thermal expansion / contraction due to ultraviolet rays.

The rain gutter according to the present invention has a good antifouling property, is not easily contaminated by dust or rain water in the atmosphere, and has no discoloration, fading, thermal deformation or thermal expansion / contraction due to ultraviolet rays. It can be used as a high performance grade. In addition to rain gutters, the present invention is expected to be applied to various structures used outdoors such as roofs, civil engineering buildings (bridges, dams, tunnels, guardrails), signboards, and the like.

1 ... Eaves 1
2 eaves 2
DESCRIPTION OF SYMBOLS 10 ... Base-material part 11 ... Resin coating layer 12 ... Intermediate resin layer 20 ... Long side side

Claims

Having a substrate part,
A resin coating layer containing at least a fluorine-based resin is formed on the entire surface or part of the base material portion,
In addition, the surface roughness of the resin coating layer is such that the plane direction is the X axis and the Y axis, the longitudinal direction is the Z axis, and the measurement length in each plane direction when the surface measurement region is arbitrarily set is Lx and Ly, respectively. A rain gutter characterized in that when the shape curve is z = f (x, y), the arithmetic mean roughness Sa (μm) represented by the following formula (1) is 0.2 or less.
The fluororesin of the resin coating layer is polyvinylidene fluoride, and when the total resin amount is 100 parts by mass, the content of polyvinylidene fluoride is 45 parts by mass or more. Rain gutter.
The rain gutter according to claim 1, wherein the resin coating layer contains an acrylic resin.
The intermediate resin layer has at least one intermediate resin layer between the base material portion and the resin coating layer, and the intermediate resin layer has an acrylic resin content of 50 to 100 parts by mass when the total resin amount is 100 parts by mass. The rain gutter according to any one of claims 1 to 3, wherein the content of the fluororesin is 0 to 50 parts by mass.
4. The resin coating layer according to claim 1, wherein the resin coating layer contains 1.0 to 6.0 parts by mass of an inorganic pigment with respect to 100 parts by mass of the total resin amount of the resin coating layer. Rain gutter.
4. The rain according to claim 1, wherein the resin coating layer contains 0.01 to 5 parts by mass of an ultraviolet absorber with respect to 100 parts by mass of the total resin content of the resin coating layer.樋.
The inorganic pigment is contained in one or both of the resin coating layer and the intermediate resin layer in an amount of 1.0 to 6.0 parts by mass with respect to 100 parts by mass of the total resin in each layer. Rain gutter.
5. The ultraviolet-absorbing agent is contained in one or both of the resin coating layer and the intermediate resin layer in an amount of 0.01 to 5 parts by mass with respect to 100 parts by mass of the total resin in each layer. Rain gutter.
The rain gutter according to any one of claims 1 to 8, wherein the base material portion is made of a hard vinyl chloride resin.