JPH07217339A - Weatherproof blind slats - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a blind slat having excellent weather resistance which can be used outdoors and which can be manufactured at a relatively low cost. [Constitution] In a blind slat comprising an aluminum plate 1 and a coating layer formed on at least one of the front and back sides thereof,
The coating layers were formed in upper and lower layers, the lower layer was a thermosetting resin-based colored coating layer 2 such as an acrylic resin, and the upper layer was a fluororesin-based transparent coating layer 3 containing an ultraviolet absorber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather resistant blind that can be used outdoors, and more particularly to a blind slat whose surface does not deteriorate even when used outdoors.

[0002]

2. Description of the Related Art In recent years, there has been a demand for weather-resistant exterior blinds which shield solar heat not indoors but outdoors to save energy. However, the blinds
Since the market has been expanded by giving priority to interior products, its weather resistance is currently behind.

[0003] In the conventional external blinds, the interior blinds are used outdoors as they are, and the coating deteriorates in several years, and the beauty and the surface protection function disappear. As conventional blind slats, aluminum metal plates coated with melamine resin-based, acrylic resin-based, or polyester resin-based paints have been mainly used, but when it is not possible to reduce the ultraviolet rays of sunlight by half by the window glass, Due to rain, the coating resin itself and the bonding strength between the coating film and the aluminum base deteriorated over time and peeled off, causing a problem in durability.

[0004]

It has been attempted to laminate a fluororesin-based coating film having excellent weather resistance on the surface of the blind slats, but the fluororesin-based coating material is very expensive in both the primer and the colored coating material, Moreover, there is a problem that it is difficult to form a beautiful blind because there is a restriction on the usable pigment color.

Further, if a conventional epoxy resin type colored coating film is simply provided on a metal plate such as an aluminum plate and a fluororesin type transparent protective film is formed thereon, it is disclosed in JP-A-63-26863.
As disclosed in No. 6, there is a problem that the adhesion is insufficient and the protective film layer or the colored layer of the conventional resin is peeled off with time. In order to solve this, there is a problem that the colored layer itself must use a fluorine resin or a pigment having weather resistance, which is also expensive.

The present invention has been made to solve these problems, and an object thereof is to maintain the beauty obtained by a colored coating film for a long time even in a severe outdoor environment. It is to provide a blind slat that can be manufactured at low cost.

[0007]

Means for Solving the Problems In order to achieve the above object, the means adopted by the present invention is to form a thermosetting resin coating film layer on at least one of the front and back surfaces of a blind slat made of aluminum or an aluminum alloy. The fluororesin-based coating layer containing an ultraviolet absorber is formed on the coating layer.
A benzotriazole-based absorber can be used as the ultraviolet absorber. Although it is desirable that the lower layer is a colored coating film and the upper layer is a transparent coating film, the upper layer can be a colored coating film in order to obtain a special color effect.

[0008]

[Function] The blind slats of the present invention are made of acrylic resin,
Since coloring is performed with an inexpensive thermosetting resin-based paint such as polyester resin, coloring is not limited, and the cost required for coloring is low. A thermosetting resin coating layer such as an acrylic resin or a polyester resin is easily deteriorated by ultraviolet rays, but since a fluororesin coating layer containing an ultraviolet absorber is formed on the coating layer, the ultraviolet rays in the upper layer It is possible to sufficiently prevent the thermosetting resin coating film layer from being deteriorated by being absorbed and ultraviolet rays. The fluororesin coating film layer has excellent weather resistance and antifouling property, and also has good adhesion to the thermosetting resin coating film layer.

As described above, in the blind slat coating film of the present invention, the lower thermosetting resin coating film serves as a primer for the fluororesin coating material and does not require an expensive fluororesin coating material primer. It's relatively cheap,
Even when exposed outdoors to rain or direct sunlight, especially ultraviolet rays, peeling due to deterioration of the coating film is prevented, and the beauty of the colored coating film can be maintained for a long period of time.

[0010]

EXAMPLES The present invention will be described based on the weather resistance test results. FIG. 1 schematically shows a cross section of a blind slat according to an embodiment of the present invention. This slat is a surface-treated aluminum plate 1 having a thickness of 0.15 mm, and an acrylic resin-based colored coating layer 2 formed on both sides of the aluminum plate.
And a fluororesin-based transparent coating layer 3 formed on the colored coating layer. The acrylic resin-based colored coating layer 2 was formed by applying an acrylic resin-based colored coating material with a roll coater and drying it with hot air. The fluororesin-based transparent coating layer 3 is formed by applying a thermosetting fluororesin-based transparent coating material containing a benzotriazole-based ultraviolet absorber onto the acrylic resin-based colored coating layer 2 with a roll coater and drying it with hot air. did.

As a comparative example, there was prepared one in which only the acrylic resin-based colored coating film layer was formed on both front and back surfaces of the same aluminum plate. As the coloring paint, two colors of beige and green were used. With respect to the prepared two-color, four-type blind slats of the example and the comparative example, an exposure test for 2000 hours, which is equivalent to 10 years outdoors, was carried out by a sunshine weather meter. 60 every 250 hours of exposure using a gloss meter
The gloss retention was measured by the specular gloss measurement method. In addition, after 2000 hours of exposure, the chalking with cellophane tape was investigated.

The test results are shown in FIG. 2, and the gloss retention rate after 2000 hours of exposure was 3 in Comparative Example Beige.
8%, Comparative Example Green 5%, Example Beige 95%
As described above, Example Green was 95% or more. In the case of choking with cellophane tape, powder adhered to the cellophane tapes of Comparative Example Beige and Comparative Example Green, but no powder adhered to the cellophane tapes of Example Beige and Example Green.

From the test results, the blind slat of the comparative example in which the fluororesin coating layer containing the ultraviolet absorber was not formed could not be used outdoors because of its poor weather resistance. It was confirmed that the blind slats have sufficient weather resistance to withstand outdoor use.

[0014]

As described above, the blind slat of the present invention comprises an aluminum plate and upper and lower two coating layers, a lower layer is a thermosetting resin coating material, and an upper layer is a fluorine resin containing an ultraviolet absorber. Since it is formed by paint, unlike the conventional case where a protective coating film containing an ultraviolet absorber was not formed, there is no risk of interfacial peeling due to deterioration of the thermosetting resin coating film even when used outdoors. It has an excellent effect.
Further, compared to the conventional fluororesin coating film formed from expensive fluororesin primer coating coloring paint, the blind slats of the present invention are expensive because the thermosetting resin coating film serves as a primer for the fluororesin coating material. Since a special fluororesin-based primer is not required, the cost can be significantly reduced, which is a remarkable effect.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a blind slat according to an embodiment of the present invention,

FIG. 2 is a graph showing the results of tests by the sunshine weather meter of Examples and Comparative Examples.

[Explanation of symbols]

1: Aluminum plate, 2: Acrylic resin-based colored coating layer, 3: UV absorber-containing fluororesin-based transparent coating layer

Claims (4)

[Claims] 1. A blind slat in which a coating film is formed on at least one of the front and back surfaces of an aluminum plate (1) or an aluminum alloy plate, wherein the coating film is composed of upper and lower two layers, and the lower layer is a thermosetting resin system. A weather resistant blind slat, which is a coating layer (2) and an upper layer is a fluororesin coating layer (3) containing an ultraviolet absorber. 2. The weather-resistant blind slats according to claim 1, wherein the lower layer is a colored coating layer and the upper layer is a transparent coating layer. 3. The weather-resistant blind slat according to claim 1, wherein the thermosetting resin coating film layer is formed of an acrylic resin coating material. 4. The weather resistant blind slats according to claim 1, wherein the ultraviolet absorber is a benzotriazole type.