JPH09277435A - Matte colored metal plate for roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a matte colored metal plate for a room having excellent matte appearance, hard human slipperiness and excellent snow slipperiness. SOLUTION: The matte colored metal plate for a roof has excellent matte appearance, hard human slipperiness and excellent snow slipperiness, and is formed by covering the surface of a metal plate or primer-treated metal plate with a colored resin film. In this case, the resin film contains 0.1 to 5wt.% fluororesin particles having a mean particle size of 10μm or less, and the surface of the coating film has maximum surface roughness (Rmax) of 15μm or more and the surface roughness of 10 or more of the number of surface rough peaks of 5μm of height existing per length of 10mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matt colored metal plate suitably used as a roofing material, and particularly to a roof which has an excellent matt appearance and is hard to slip on people and is excellent in snow sliding property. We propose a matte colored metal plate that satisfies the performance requirements peculiar to wood.

[0002]

2. Description of the Related Art A colored metal plate formed by coating a colored resin coating film on the surface of a metal plate is used in a wide range of fields such as the field of building materials and the field of home appliances. This colored metal plate is classified into a matte colored metal plate and a glossy colored metal plate in terms of designability. Among them, the matte colored metal plate is considered to be high-grade and taste diversified by consumers in recent years. , Its usage is growing.

Matting of such a colored metal plate is performed by forming fine irregularities on the surface of the coating film by interposing organic or inorganic fine particles in the coating film of the colored resin, thereby making the surface of the coating film glossy.
It is known that this is done by adjusting to a range of 2 to 50 with a measured value of 60 degree gloss. For example, Japanese Examination 6
-900 gazette describes a matting technique in which organic fine particles having an average particle size of 15 to 80 μm and an inorganic coating surface adjusting agent are mixed in a coating film. A matting technique in which a silica-based matting material is blended is disclosed in JP-A-3-2202.
No. 68, there is disclosed a matting technique in which a vinyl resin is blended with weather-resistant high-molecular polymer particles and fine particulate synthetic silica.
Japanese Patent Laid-Open No. 63-189474 discloses a matting technique in which fine hollow silica-based powder of 80 mesh is mixed in a coating film.

[0004]

As described above, the prior art relating to the matt-colored metal plate is such that the coating film formed on the surface of the metal plate is mixed with the organic particles or the inorganic particles exhibiting the matte color tone. Erasing technology was the mainstream. That is, these conventional techniques are focused on improving the design of the colored metal plate, and do not consider the slipperiness of the colored metal plate (the coating surface of the matte colored metal plate is slippery). . Therefore, the above-mentioned conventional technique has left unsolved problems as described below.

One of the problems is that the matt colored metal plate is liable for the operator to slip his feet when it is installed as a roofing material. As a result, workability may be reduced, and in some cases, a worker may fall.

[0006] The other is that the matte colored metal plate is used as a roofing material in a snowy area, as compared with the glossy colored metal plate,
The problem is that the snow on the roof is hard to fall off (it has poor snow gliding properties). As a result, a roofing material having insufficient snow sliding property needs to frequently perform daily snow removal work on a roof in a snowfall area, and its economical and physical burden is large.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The object of the present invention is to have an excellent matte appearance and to prevent the person from slipping and snowing. Is to provide an excellent new matt colored metal sheet for roof.

[0008]

Means for Solving the Problems The inventors of the present invention have earnestly studied to develop a matt colored metal plate which satisfies the above-mentioned required performance peculiar to a roofing material. As a result, it was found that the above object can be achieved when the coating film contains fluororesin fine particles as an essential component and the coating film surface satisfies a predetermined surface roughness, and the present invention was completed. It was

That is, the present invention provides a novel roof matted colored metal plate which has an excellent matte appearance and is hard to slip on people and is excellent in snow sliding property. A matte colored metal plate having a surface coated with a colored resin coating film, wherein the colored resin coating film contains 0.1 to 5 wt% of fluororesin particles having an average particle diameter of 10 μm or less, and The coating film surface has a maximum surface roughness (Rmax) of 15 μm or more and a surface roughness such that the number of surface roughness peaks with a height of 5 μm or more existing per 10 mm length is 10 or more. We propose a characteristic matte colored metal plate for roofs.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION According to the matt colored metal plate for a roof having such a structure, a relatively large convex portion is formed on the surface of the coating film, so that the slippage of a person can be suppressed and the surface shape ( By depositing fine fluororesin particles on the surface of the coating film that does not affect the convex portion), it is possible to realize good snow sliding properties while suppressing human slippage. Moreover,
The matte colored metal sheet for roof of the present invention has a surface gloss of 60.
It has an excellent matte color tone that can be adjusted within a range of 2 to 50 in terms of the degree gloss measurement value.

Hereinafter, the present invention will be described in detail. Examples of the metal plate that constitutes the matt colored metal plate for roof of the present invention include cold-rolled steel plate, hot-dip galvanized steel plate, electrogalvanized steel plate, alloy-plated steel plate, aluminum plate, stainless steel plate, copper plate, and copper-plated steel plate. Board can be applied.

These metal plates can be subjected to a conventionally known surface treatment or primer treatment in order to improve the adhesion with the coating film. Examples of the surface treatment include phosphoric acid surface treatment, chromic acid surface treatment, chromic acid coating agent treatment, and the like. Further, the primer treatment is appropriately selected depending on the type of metal plate, surface treatment agent, and paint, but for this treatment, an epoxy resin, polyester resin, or modified resin primer thereof is preferably used. Antirust pigments such as chromic acid antirust pigments and phosphoric acid antirust pigments may be added to these primer resins for the purpose of improving corrosion resistance. Examples of the chromic acid-based rust preventive pigment include strontium chromate, zinc chromate, calcium chromate, and the like, and examples of the phosphoric acid-based rust preventive pigment include aluminum polyphosphate.

As the resin of the coating film forming the matte colored metal plate for a roof of the present invention, any resin can be used as long as it is a paint resin used for ordinary colored metal plates. However, considering that the matt colored metal plate of the present invention is used for a roofing material, it is more preferable to select a coating resin that can withstand various forming processes. That is, it is desirable to use a coating resin having a glass transition point or a softening point in the range of 10 to 50 ° C. Specific examples of the resin include polyester resins, oil-modified alkyd resins, vinyl resins, acrylic resins, vinyl chloride resins, and silicone-modified resins of these. In addition, these resins can form cross-linking by various cross-linking agents as needed.

The fluororesin particles, which are an essential component of the coating film constituting the present invention, are added and contained in order to improve the snow sliding property, and utilize the inherent water repellent property of the fluororesin. . The specific action of the fluororesin particles will be described below. That is, at the interface between the roof and the snow when there is snow, water melted by the heat from the interior of the house and the heat from the sun exists. This water repeats the cycle of becoming ice when the temperature falls below 0 ° C. and becoming water again when the temperature rises. At this time, the ice serves to bond the snow on it with the coating on the roof surface. In the case of an ordinary coating film, the wettability between the coating film surface and water is good, and since ice and the coating film on the roof surface are more firmly bonded, almost no natural snowfall can be expected. In this respect, when the fluororesin particles are present on the coating film surface like the coating film according to the present invention,
Due to its water repellency, water turns into ice without sufficiently wetting the roof coating surface. Therefore, the bond between the ice and the surface of the coating film becomes fragile, and when a load is applied to the interface due to a certain amount of snow, the bond between the ice and the surface of the coating film is broken and snow falls naturally.

Further, recently, the heat insulation of the roof has been advanced, and in this case, it is less likely that the above-mentioned ice is present at the interface between the coating film on the roof surface and the snow, and most snow is directly It is glued to the roof. Even in this case, according to the configuration of the coating film according to the present invention, since the surface energy of the fluororesin present on the coating film surface is extremely small,
After all, the adhesion strength between snow and the paint film on the roof surface is low, and if a certain load due to snow is applied to the interface, snow will fall naturally.

As described above, the best snow sliding property can be obtained by covering the entire surface of the coating film with the fluororesin particles, but at the same time, it is not suitable because it makes the person slide well. This is because the fluororesin has a small friction resistance with many substances. Therefore, the inventors have made earnest studies in order to achieve the conflicting performances of suppressing the snow sliding property and the slipping of a person. As a result, the inventors have found that human slippage can be significantly suppressed by the large unevenness of the coating film surface.
It has been found that snow sliding can be improved by allowing a certain amount of fluororesin particles to be present on the surface of the large unevenness. That is, the inventors have found that the water repellency of the coating film surface that promotes the snow sliding property mainly depends on the microscopic surface state, and the human slipping mainly depends on the macroscopic surface shape.

The inventors examined the average particle size and content of the fluororesin particles based on these basic findings. As a result, it was found that the following conditions are suitable for achieving both the snow sliding property and the suppression of human slip. That is, the fluororesin particles contained in the coating film must have an average particle diameter of 10 μm or less. When the average particle size exceeds 10 μm, the number of resin particles present on the surface of the coating film decreases, which results in
This is because sufficient snow sliding property cannot be obtained. The content of the fluororesin particles in the coating film is 0.1 to 5 wt%. The reason for this is that if it is less than 0.1 wt%, the number of resin particles exposed on the surface of the coating film is small and snow sliding becomes insufficient, while if it exceeds 5 wt%, the number of resin particles exposed on the surface of the coating film is large.
This is because people will slip and it is not appropriate. Since the fluororesin particles have extremely low surface energy, they have a low affinity with any of the components in the coating film, resulting in segregation on the coating surface. Therefore, even with a small content of 0.1 to 5 wt%, the snow sliding property is sufficiently maintained.

Examples of such fluororesin particles include PT
FE (tetrafluoroethylene), PFA (tetrafluoroethylene-perfluoropropyl vinyl ether copolymer resin),
Examples thereof include FEP (tetrafluoroethylene-6-fluoropropylene copolymer resin), ETFE (tetrafluoroethylene-ethylene copolymer resin), PVdF (vinylidene fluoride), PVF (vinyl fluoride) and the like. Among them, PTFE having the highest fluorine content is preferable because it has the highest contact angle with water and the lowest friction coefficient.

Further, as a result of studying the surface shape of the coating film for suppressing the slippage of a person, the inventors have found that it can be defined by the surface roughness as described below. That is, the coating film constituting the present invention has a maximum surface roughness (Rmax) of 15
It is necessary to have a surface roughness satisfying the condition that the number of surface roughness peaks having a height of 5 μm or more and existing per 10 mm length of 10 μm or more is 10 μm or more. The reason for this is that if the maximum surface roughness is less than 15 μm, the effect of suppressing the slipperiness of a person becomes insufficient. Although the upper limit of this maximum surface roughness is not specified from the viewpoint of slipperiness of people, considering that the appearance of the actual roofing material is important, 50μ
m or less. The reason why the number of surface roughness peaks having a height of 5 μm or more per 10 mm length is 10 or more is that the number of the peaks is less than 10,
This is because the effect of suppressing the slipperiness of a person becomes insufficient. The upper limit of the number of peaks is also not specified from the viewpoint of slipperiness of people, but in the same way as described above, considering that the appearance as an actual roofing material is important, per 10 mm length It is desirable to use 50 or less.

In the present invention, the uneven surface having the above-mentioned surface roughness formed on the surface of the coating film is preferably formed by adding an aggregate to the coating film.
If this aggregate can realize the above surface roughness,
There is no particular limitation. That is, as the aggregate, any one kind selected from organic particles and inorganic particles, or a combination of two or more kinds can be used. The shape of the aggregate may be spherical or amorphous as long as it is in the form of particles, but fibrous ones are not preferred because they form a shape on the surface of the coating film that hinders snow sliding. The particle size of the aggregate is not particularly limited as long as the above-mentioned surface roughness can be realized, and an average particle size of 5 to 50 μm used as a normal aggregate is sufficient. At this time, two or more kinds of aggregates having different average particle diameters may be mixed and used. However, the average particle size of the aggregate is
It must be larger than the average particle size of the fluororesin particles added at the same time. This is because if the average particle size of the aggregate is smaller than the fluororesin particles, the effect of suppressing the slipperiness of a person becomes insufficient. The amount of the aggregate added is not particularly limited as long as it can achieve the above-mentioned surface roughness, but if it is too large, the coating hardness, workability, etc. originally required for the colored metal plate deteriorates, and the coating amount is also reduced. This is not preferable because it causes problems such as insufficient film properties and a non-uniform appearance. Considering these matters, it is desirable that the content of the aggregate added to the resin coating film is 50% by weight or less, preferably 30% by weight or less.

Examples of the organic particles constituting such an aggregate include resin particles of acrylic resin, polyester resin, nylon resin, polyacrylonitrile and the like. As the inorganic particles, silica, as amorphous particles,
Synthetic mica, mica, talc, alumina, ceramic,
Examples thereof include aluminum paste, and examples of particles having a shape close to a sphere include silica balloons and glass beads.

The matte colored metal plate for a roof of the present invention may be added with a usual matting agent in order to realize a further lower gloss. This is to reduce the gloss by forming finer unevenness on the large unevenness of the coating film surface, and is realized by adding a matting agent having a very small particle size. Any known matting agent may be used, but silica having a particle size of 10 μm or less is preferable. Further, the matte colored metal plate for a roof of the present invention is an additive component conventionally used as an additive for paints, for example, titanium white, iron oxide, carbon black, etc., within a range that does not impair the original purpose. Other coloring pigments, extender pigments such as calcium carbonate, UV absorbers, anti-scratch agents, and antioxidants can be added.

In manufacturing the matte colored metal plate for a roof according to the present invention as described above, first, a colored resin coating material is applied to the surface of the metal plate or the metal plate subjected to the primer treatment. The coating method is not particularly limited, but a roll coating method, a curtain coating method or the like is recommended from the viewpoint of economical efficiency in coating. The colored resin paint is
Any resin may be used as long as it contains the constituent components of the resin coating film according to the present invention, and the resin coating component dispersed or dissolved in an organic solvent, water, or a plasticizer can be used. Further, as the known additives, a leveling agent, a defoaming agent, a dispersant, an anti-repellent agent, a color separation preventing agent, an anti-settling agent and the like can be added to the colored resin coating material, if necessary.

Next, the coating material applied to the metal plate is heated and dried at the heating and curing temperature of the coating resin which is the main component.
Usually, the ultimate plate temperature after 15 to 60 seconds is 160 to 270 ° C.
The thickness of the coating film thus formed on the surface of the metal plate is not particularly limited, but it is preferably 8 to 20 μm in consideration of durability, peeling resistance, appearance and the like. The reason is that if the thickness is less than 8 μm, not only a sufficient appearance cannot be obtained, but also the durability becomes insufficient. On the other hand, when it exceeds 20 μm, the aggregate is buried in the coating film because the film thickness is too large, and not only the required surface roughness cannot be obtained,
Also, it is not preferable because the appearance is impaired by foaming that occurs during coating.

[0025]

EXAMPLES The present invention will be described below with reference to examples.
On the surface of the steel strip of hot-dip galvanized steel sheet (plate thickness 0.35 mm), apply the coating type chromate at about 40 mg / m ^{2, and then} apply the epoxy resin primer to a dry film thickness of 3 μm,
Baking was performed so that the reached plate temperature after 30 seconds was 210 ° C. Then, the coating materials of the components shown in Table 1 were applied so that the dry film thickness was 12 μm, and baked so that the ultimate plate temperature after 40 seconds was 230 ° C. Further, except that the fluororesin particles and the aggregate are changed, the coating composition is applied in the same manner as the coating composition shown in Table 1, and the coating is applied to the steel strip surface of the hot-dip galvanized steel sheet.
Baked. The various matte-colored metal plates thus obtained were evaluated as follows. The results are shown in Table 2. As is clear from the results shown in this table, it was found that the matte-colored metal plate according to the present invention is excellent in snow sliding property while suppressing human slipping property.

[0026]

[Table 1]

[0027]

[Table 2]

(Evaluation Method) (1) Surface Roughness Using a surface roughness profile measuring device (JIS B 0651), measurement was performed at a measurement length of 10 mm and a measurement speed of 0.3 mm / s. (2) Sliding test of humans Various slopes (5 inch slope: 29 degrees, 6 inch slope: 34 degrees)
It was attached to a simulated roof with, and polyester fiber socks were put on the test plate to actually ride it, and the slipperiness was relatively evaluated. Evaluation Criteria ○: Almost non-slip △: Slightly slippery ×: Well slippery (3) Snow sliding property Various slopes of test plate (5 inch slope: 29 degrees, 6 inch slope: 34 degrees)
It was attached to a simulated roof with a roof and exposed outdoors, and the snow sliding property during snowfall was visually observed for several days for relative evaluation. Evaluation criteria ○: Natural snowfall is seen and the amount of snow on the roof is small. Δ: Some natural snowfall was observed, and the amount of snow on the roof was slightly small. ×: Almost no natural snowfall was observed and the amount of snow on the roof was large. (4) Glossiness It was evaluated by the measurement value of 60 ° gloss measured according to JIS Z 8741.

[0029]

As described above, according to the present invention, a novel matte colored metal plate for a roof, which has an excellent matte appearance and is hard for humans to slip and has excellent snow sliding property, can be stably prepared. Can be provided. Therefore, when this matte colored metal plate is used as a roofing material, workers can work safely without slipping, falling down or falling down, and because it has excellent snow sliding properties, the amount of snow accumulated on the roof is large. It is also possible to reduce the burden of snow removal work.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location C09D 201/00 PDD C09D 201/00 PDD // (C09D 201/00 127: 12)

Claims (1)

[Claims] 1. A matte colored metal plate obtained by coating and forming a colored resin coating film on the surface of a metal plate or a metal plate subjected to a primer treatment, wherein the colored resin coating film has an average particle size in the coating film. It contains 0.1-5 wt% of fluororesin particles of 10 μm or less, and the coating film surface has a maximum surface roughness (Rmax) of 15 μm or more and 10 mm.
A matte colored metal plate for a roof, having a surface roughness such that the number of surface roughness peaks having a height of 5 μm or more existing per length is 10 or more.