JP7370800B2 - metal exterior material - Google Patents

Description

The present invention relates to a metal exterior material that forms the exterior of buildings and structures.

In general, there are many exterior materials on the market in which the decorative surface of a board is decorated using a roll coater, flow coater, inkjet printer, etc. (For example, see Patent Document 1).

Japanese Patent Application Publication No. 2019-058877

Patent Document 1 relates to a "method for manufacturing a film structure and a building board," and after irradiating the surface of a first film with electromagnetic waves, a water-based paint is applied to the surface of the first film to produce a second film. It is described that a coating structure is produced by:

However, Patent Document 1 describes that after irradiating the surface of the first coating with electromagnetic waves, a water-based paint is applied to the surface of the first coating to produce a second coating. There is no description of a structure for improving hydrophilicity when a water-based fluorine paint is formed on a fluorine coat.

In order to solve these drawbacks, the present invention provides a horizontally elongated metal material in which a core material is formed between the metal surface material and the back surface material, and a male and female connection structure is formed at the upper and lower ends of the metal surface material. In the case of exterior materials, the metal surface material forms a fluororesin coating film on the metal base material via a chemical conversion film and a primer, and the fluororesin coating film has a surface composed of a matte material, pigment, and aggregate. corona discharge is applied to the fluororesin coating film , and a water-based fluororesin paint is applied on the corona discharged fluororesin coating film so as to cover the irregularities formed on the surface of the fluororesin coating film. The present invention provides a metal exterior material having a coated and cured coating formed thereon.

According to the metal exterior material according to the present invention, by applying corona discharge to the fluororesin coating film on the surface of the metal surface material made of a fluororesin-coated steel plate, (1) the surface of the fluororesin coating film is By temporarily destabilizing (activating) the surface of the fluororesin coating, it becomes hydrophilic, making it easier to attach the water-based fluororesin coating, and improving adhesion. (2) By adding a wax agent to the water-based fluorine paint, the coefficient of friction can be lowered and scratches can be prevented. It has the following characteristics and effects.

It is an enlarged end view showing a representative example of a metal surface material in a metal exterior material according to the present invention. 1 is a sectional view showing a representative example of a metal exterior material according to the present invention. FIG. 2 is a sectional view showing the construction state of the metal exterior material according to the present invention. FIG. 1 is a partially enlarged sectional view showing a representative example of a metal exterior material according to the present invention.

An embodiment of the metal exterior material according to the present invention will be described in detail below with reference to the drawings. That is, FIGS. 1(a) and 1(b) are enlarged end views showing a representative example of the metal surface material 1 of the metal exterior material A according to the present invention, and FIG. 2 shows the metal exterior material A according to the present invention. 3 is a sectional view showing a construction state, and FIG. 4 is a partially enlarged sectional view showing a typical example of the metal exterior material A, in which 6 parts of the decorative surface are omitted and are shown by broken lines. Further, α is the building frame, β is the fixture, and γ is the connecting joint.

As shown in FIG. 2, the metal exterior material A according to the present invention is a metal exterior material A in which a core material 3 made of, for example, a synthetic resin foam is sandwiched between a metal surface material 1 and a back surface material 2. In addition, in FIGS. 2 to 4(a) and (b), the uneven pattern (embossed pattern) of the decorative surface 6 portion is omitted and shown in a simplified manner.

The metal surface material 1 and the back surface material 2 are metal thin plates, such as iron, aluminum, copper, stainless steel, titanium, aluminum/zinc alloy plated steel plates, clad steel plates, sandwich steel plates (vibration damping steel plates, etc.) (of course, these can be made in various colors). (including painted colored steel sheets) is embossed roll-formed or press-formed and processed into various shapes. In addition, as the backing material 2, aluminum vapor-deposited paper, kraft paper, asphalt felt, metal foil (Al, Fe, Pb, Cu), synthetic resin sheet, rubber sheet, cloth sheet, gypsum paper, aluminum hydroxide paper, glass fiber nonwoven fabric It may also be a laminate of one or more of the above, or a sheet-like material treated with waterproofing or flame retardant treatment.

The core material 3 is made of synthetic resin foam such as polyurethane foam, polyisocyanurate foam, phenol foam, vinyl chloride foam, polyethylene foam, polystyrene foam, urea foam, etc., and is made of a metal surface material 1 or back material. A synthetic resin foam stock solution is discharged onto the back side of the metal sheet 2 and heated to cause reaction, foaming, and hardening, thereby integrally forming the metal surface material 1 and the back surface material 2 using the core material 3. In addition, the core material 3 contains various flame retardant materials such as lightweight aggregates (perlite grains, glass beads, gypsum slag, talcum stone, shirasu balloons, aluminum hydroxide, etc.), fibrous materials (glass wool, rock wool, carbon fiber, Graphite, etc.) can also be mixed to improve fire resistance and fire prevention properties.

The metal exterior materials A are connected to each other as shown in FIG. 3 by connecting the engaging pieces 10 to the fitting grooves 16 and the fitting pieces 14 to the engaging grooves 11. Of course, in the figure, it is formed horizontally, but it can also be formed vertically by performing construction in the horizontal direction.

As an example of the overall shape of the metal exterior material A, as shown in FIGS. 2 to 4(a) and (b), there is a core between the metal surface material 1 and the back surface material 2 made of long thin metal plates. The material 3 is sandwiched, and a male connecting portion 4 is formed at one end in the width direction, and a female connecting portion 5 is formed at the other end. It was formed.

More specifically, the male connecting portion 4 includes a side wall 7 with the lower end of the decorative surface 6 bent toward the back side, an upper surface 9 with the tip of the side wall 7 projecting upward, and an engaging piece 10 with the tip of the upper surface 9 bent downward. and an engagement groove 11 consisting of an upper surface 9 and an engagement piece 10.

The female connecting portion 5 includes a side wall 8 with the upper end of the decorative surface 6 bent toward the back side, a joint bottom surface 12 with the tip of the side wall 8 bent upward, and a lower surface 13 with the tip of the joint bottom surface 12 folded back and protruding downward. It is formed from a fitting piece 14 consisting of a joint bottom surface 12 and a lower surface 13, a fixing surface 15 that protrudes by bending the tip of the lower surface 13 upward, and a fitting groove 16 formed from the lower surface 13 and the fixing surface 15. It is something. Note that P is a packing formed to enhance waterproofness.

The decorative surface 6 is formed by forming a fluororesin coating film 1b on a metal base material 1a via a chemical conversion coating and a primer, as shown in FIGS. This is a metal surface material 1 made of a fluororesin-coated steel plate (pre-coated steel plate).

Further, fine irregularities are formed on the fluororesin coating film 1b in order to form a matte material 1c, a pigment 1d, and an aggregate 1e.

When the water-based fluorine paint D was applied as a decorative paint to the surface of the fluororesin-coated steel plate B, there was a major drawback in that the adhesion was weak. This is because the surface of the fluororesin-coated steel plate B is stable and water-repellent, so water-based paints are repelled and the adhesion is weak.

Therefore, in the metal exterior material A of the present invention, as shown in FIG. By temporarily destabilizing (activating) the surface of the fluororesin coating film 1b, the fluororesin coating film 1b was made hydrophilic, making it easier to adhere the water-based fluororesin paint D, and improving adhesion. Of course, the final step is to go through a drying, baking, and curing process to bond and integrate them.

Corona discharge C (local destructive discharge) is a general term for continuous discharge that occurs due to the generation of a non-uniform electric field around a sharp electrode (needle electrode). It is called. The current flowing due to the corona discharge C is small, on the order of several μA.

As another example, by adding a wax agent to the water-based fluorine paint D, the coefficient of friction is reduced, resulting in a metal exterior material A that can prevent scratches.

Further, by adding a drying aid to the water-based fluorine paint D, the drying time can be shortened, and the metal exterior material A can improve adhesion by drying and evaporating water.

Furthermore, as shown in FIG. 1(b), if the fine unevenness of the matte material 1c, pigment 1d, and aggregate 1e on the decorative surface 6 is applied, and the water-based fluorine paint D is applied between the protrusions, it will cause scratches. Although the friction of the object that causes this comes into contact with the top of the convexity, the probability of damaging the paint between the convexities is reduced. Due to this effect, although the upper part of the convexity is scratched, most of the parts are not scratched. This method is suitable for roll coater painting.

α Building block β Fixing device γ Connection joint A Metal exterior material B Fluorine resin coated steel plate C Corona discharge D Water-based fluorine paint P Packing 1 Metal surface material 1a Metal base material 1b Fluorine resin coating 1c Matte material 1d Pigment 1e Bone Material 2 Back material 3 Core material 4 Male connecting portion 5 Female connecting portion 6 Decorative surface 7 Side wall 8 Side wall 9 Top surface 10 Engagement piece 11 Engagement groove 12 Joint bottom surface 13 Bottom surface 14 Fitting piece 15 Fixed surface 16 Fitting groove

Claims (2)

In a horizontally long metal exterior material in which a core material is formed between a metal surface material and a back surface material, and a male and female connection structure is formed at the upper and lower ends of the metal surface material, the metal surface material is a metal base material. A fluororesin coating film is formed on top via a chemical conversion coating and a primer, and the fluororesin coating film has a surface unevenness made of a matte material, pigment, and aggregate, and corona is applied to the fluororesin coating film. A water-based fluorine paint is applied and cured to cover the unevenness formed on the surface of the fluororesin coating film, and a coating film is formed on the fluororesin coating film subjected to the corona discharge. Metal exterior material. The metal exterior material according to claim 1, wherein a wax agent is added to the water-based fluorine paint.

Images