JP2912740B2 - Metal gutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal gutter.

[0002]

2. Description of the Related Art As a building becomes more sophisticated, maintenance-free, fashionable, etc., rain gutters have a long-lasting durability with high design, making use of metallic materials such as stainless steel and copper. There is a demand for the production of rain gutters having good workability. At present, there are rain gutters made of stainless steel and copper as they are.

[0003]

A rain gutter formed by processing a metal material as it is is affected by sea salt, acid rain, air pollutants (sulfurous acid gas, smoke, automobile exhaust gas, and the like), and is subject to corrosion or corrosion. Appearance abnormalities are likely to occur due to contamination, and in severe cases, drainage dysfunction due to perforation may occur, which is not sufficient in terms of long-term durability.

In order to improve this point, when an organic clear coating is applied, for example, a fluorine-based paint or an acrylic-silicone-based paint, which is generally said to have excellent durability, can be used for clearing. In addition, the UV resistance of the paint itself cannot be said to be sufficient, and cracking, chalking, peeling, and the like due to deterioration of the coating film are likely to occur. When a primer layer is used to secure the coating film adhesion, even if the coating film does not deteriorate noticeably, the long-term effect of the ultraviolet absorber contained in the coating film cannot be expected in the long term, Penetrates, deteriorating the primer portion, and easily peeling off the coating film.

Further, when laminating a fluorine-based film, an acrylic-based film or the like on a metal material, it is difficult to cope with various shaped products, and there is a problem in film edge treatment, so that only a limited shape can be applied. . Further, similarly to the above, securing long-term durability of the adhesion primer portion becomes a problem.
In particular, fluorine-based coatings that are organic and have excellent weather resistance can be coated well, and even if their long-term durability can be secured to some extent, bonding in rain gutters during construction and adhesion work to prevent water leakage This is not possible unless a special method is used, and there is a problem of deterioration in workability.

An object of the present invention is to provide a rain gutter which solves these problems, has long-term durability, realizes high designability, and can meet the above market needs. .

[0007]

In order to solve the above-mentioned problems, the present invention is based on a metal material processed into the shape of a rain gutter, and has a chemical conversion treatment layer as a first layer on the surface thereof. A metal rain gutter having a transparent inorganic coating film as a second layer on a first layer is provided. In the present invention, in a metal rain gutter in which an inorganic coating film having transparency is formed on the surface of a metal material processed into the shape of a rain gutter,
A chemical conversion treatment layer having excellent ultraviolet resistance is formed as a first layer on the surface of the metal material, and the inorganic coating film is formed as a second layer on the first layer.

[0008] As the metal-based material used in the present invention,
Examples include, but are not limited to, stainless steel, copper, and the like. This metal material used is processed into the shape of a rain gutter. As a first layer on the shaped product based on this metallic material, if necessary, in order to improve the corrosion resistance and ensure the adhesion of the inorganic coating, a chemical conversion treatment with a low degree of coloring that does not cause ultraviolet light deterioration due to sunlight is a problem. Form a coating.

The chemical conversion treatment layer used in the present invention refers to, for example, a film obtained by ordinary chromate treatment and phosphate chemical treatment. The chemical conversion treatment film includes chromate chromate, chromate phosphate, zinc phosphate, calcium phosphate, iron phosphate and the like. In particular, a chromate treatment is preferably applied to a stainless steel or aluminum substrate, and a chromate treatment containing silica powder or colloidal silica is particularly desirable to ensure long-term adhesion to the inorganic coating film used in the present invention. Further, a part of the organic resin may be included, but the amount of the organic resin is preferably 5% or less. If the amount exceeds 5%, the stability of the chromate solution is deteriorated, and in terms of performance, the adhesion is lowered and the long-term durability is adversely affected. The chemical conversion coating preferably has a total chromium content of 5 mg / m ² or more. 5
When the amount is less than mg / m ² , the adhesiveness to the inorganic coating film and the corrosion resistance are adversely affected. Processing method, immersion treatment, coating treatment or the like, colored especially particular about not the processing amount becomes too much, since the stands out from the top of the second layer in which inorganic coating film, good to the 30 mg / m ² or less . The temperature at that time may be, for example, room temperature. Drying of the treated film after application may be performed at room temperature, but is preferably performed at 50 ° C. or higher from the viewpoint of workability. Preferably, 80 ° C to 120 ° C is good.

In the present invention, the formation of the chemical conversion treatment layer is performed, for example, in the case of stainless steel SUS304.
Cr with reduced amount of valent chromium as much as corrosion resistance allows
^It is preferable that a coating type chromate having about ^{6 +} / Cr ³⁺ = 1 and a type containing silica, phosphoric acid, etc. be treated at a low concentration. Further, an inorganic coating is applied as a second layer.

The inorganic coating used for the inorganic coating (hereinafter referred to as "inorganic coating M") may be any as long as it forms an inorganic coating film having transparency. A silicon alkoxide-based coating material is cited in that the film has good elongation and the coating film is hardly cracked during processing and cutting. Commercial products of such silicon alkoxide-based coating materials include, for example, MF20X (trade name, manufactured by Fuji Fire Chemical Co., Ltd.).

The inorganic coating material M is applied in an appropriate manner to form a coating film. As a result, a rain gutter through which the underlying metal can be seen from above the inorganic coating film is obtained.

[0013]

[Action] Inorganic coating has excellent weather resistance (ultraviolet resistance) and is resistant to contamination. In addition to the chemical conversion treatment, it has excellent adhesion and corrosion resistance, and realizes long-term maintenance-free operation as a rain gutter. It is also possible to apply a hairline process, embossing process, etc. to the base metal as a pre-treatment, and since the coating film has excellent UV resistance, inorganic matting agents, coloring agents, etc. provide weather resistance. It can be added without lowering, and has a high degree of freedom in gloss and color tone.

A general coating method such as a chemical conversion treatment such as a shower or a dipping method and an inorganic coating such as an air spray or an electrostatic coating is possible, so that a rain gutter shape design is free. In addition, the cutting process during construction does not cause cracks in the coating film enough to reduce the quality after construction, and rain gutter bonding by adhesion and water leak prevention treatment can be easily performed with silicone caulking agent, metal Workability similar to that of a single product can be secured.

[0015]

EXAMPLES Specific examples and comparative examples of the present invention will be shown below, but the present invention is not limited to the following examples. Examples 1 and 2 and Comparative Examples 1 to 6 A hairline processed product of stainless steel SUS304 (manufactured by Nissin Steel Co., Ltd .: thickness 0.8 mm) was used as a base metal in a usual manner. A first layer shown in Tables 1 and 2 was formed on the base metal, and a second layer was formed thereon to obtain a metal rain gutter.

The chromate conversion treatment is carried out using Cr ³⁺ /
Cr ⁶⁺ = 1 (weight ratio), SiO ₂ / total Cr = 2 (weight ratio), particle size of fine silica powder: Aerosil 200, P
O ₄ ³⁻ / total Cr = 0.3 (weight ratio), water-soluble resin: none, coating amount: Cr 15 mg / m ² . The inorganic paint M used in the examples was MF20X (silicon alkoxide-based coating material) manufactured by Fuji Fire Chemical Co., Ltd.

[0017]

[Table 1]

[0018]

[Table 2]

Regarding the obtained rain gutter, weather resistance, corrosion resistance,
The adhesiveness, cutting workability and adhesiveness were examined, and the results are shown in Tables 3 and 4. The weather resistance was measured with an eye super UV tester using the following table as one cycle (8 hours + 4 hours = 12
The test was performed up to a UV irradiation time of 1100 hours (corresponding to the amount of UV radiation equivalent to 20 years in Japan) and evaluated. Test conditions Time 8 hours 4 hours UV irradiation Available (100 mW / cm ² ) None Temperature 63 ° C 35 ° C Humidity 50% 90% or more (with condensation) Corrosion resistance is continuously sprayed with 5% salt water at 35 ° C Was performed for 2000 hours, and the degree of corrosion was visually evaluated.

After 7 hours of boiling, the adhesion was checked by confirming the adhesion with an adhesive tape (cellophane tape). The cutting workability was evaluated by observing cracks in the coating film after cutting with a high-speed cutter. The adhesiveness was evaluated based on whether an adhesive having good workability comparable to that of a general gutter could be selected.

The judgment levels are as follows. …: No abnormalities were found in the evaluation results. This is a satisfactory level as a gutter. △: Somewhat abnormal. It is a level of dissatisfaction as a gutter. ×: Abnormal. Gutter not applicable.

[0022]

[Table 3]

[0023]

[Table 4]

As shown in Tables 3 and 4, weather resistance, corrosion resistance, and adhesion were obtained by forming a chemical conversion treatment layer as the first layer and an inorganic coating film as the second layer on the metal material. A gutter excellent in cutting workability and adhesiveness is obtained.

[0025]

The metal gutter of the present invention has long-term durability, realizes high designability, and can meet the above-mentioned market needs.

Continued on the front page (72) Inventor Kazuo Seto 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. Yukio Shimada 1048 Kazuma Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-53-122640 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04D 13 / 064 501 C23C 22/24 C23C 22/30

Claims (1)

(57) [Claims] 1. A metal base material processed into the shape of a rain gutter, and a silica powder or a core powder as a first layer on the surface thereof.
A conversion treatment layer comprising a chromate treatment film containing roid silica, and a silicon layer as a second layer on the first layer.
A metal gutter having a transparent inorganic coating film with a lucoxide coating material .