JPH11229582A - External wall board joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an external wall board joint structure causing no crack in external facing of the joint part even in long-term use and excellent in an external appearance. SOLUTION: In this external wall board joint structure, a joint processing material 11 is adhered to the opposed edge parts 1a of adjacent external wall boards 1 so as to stride over between both edge parts 1a, 1a. A facing paint film layer 12 is applied on the upper side so as to stride over the surface 1b of the joint processing material 11 and the outer wall boards 1. This facing paint film layer 12 is composed of an elastically deformable elastic acrylic silicone paint film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint processing structure for an adjacent outer wall board of a building or the like.

[0002]

2. Description of the Related Art Conventionally, as this kind, there is, for example, one shown in FIG. 6 (Japanese Patent Publication No. 2-137).
No. 02). This is the adjoining outer wall boards 1, 1
Tape 3 is adhered so as to cover the gap 2 of
A cold gauze 4 wider than the tape 3 is stretched from above, and an elastic sealing material 5 is applied in a strip shape over the cold gauze 4 over a larger area. Thereafter, the exterior coating layer 6 is applied over the entire outer wall board 1.

[0003] However, in such a conventional example, in order to prevent the occurrence of cracks, it is necessary to apply the elastic sealing material 5 after the cold gauze 4 is attached, and the workability is poor. Variations in the coating thickness are likely to occur, causing cracks.

[0004] Therefore, various seam treatment materials or outer wall board seam structures have been proposed in which the number of working steps is small and cracks or the like are prevented from occurring.

For example, Japanese Patent Laid-Open Publication No. Hei 5-222818 proposes a seam treatment material in which a nonwoven fabric and a reinforcement coating are previously formed integrally, and the seam treatment material is used to oppose adjacent outer wall boards. There has been proposed an outer wall board joint structure which is bonded by an adhesive so as to straddle between edge portions to be formed.
Also, JP-A-6-28067, JP-A-9-15
No. 8440 discloses a similar outer wall board joint structure.

According to such an outer wall board joint structure,
It is possible to provide an outer wall board joint structure which has good workability, hardly causes variation in coating thickness, and does not cause cracks.

[0007]

However, in the outer wall board joint structure proposed in the prior art, cracks sometimes occur during long-term use even if there is no problem in short-term use. Was. In addition, in the outer wall board joint structure exposed to the natural environment for a long period of time, the brightness of the joint portion (joint portion) changes, and the appearance deteriorates.

Accordingly, an object of the present invention is to provide an outer wall board joint structure having an excellent appearance which does not cause cracks such as cracks in the joint exterior even during long-term use.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the invention described in claim 1 is characterized in that opposing edge portions of adjacent outer wall boards are provided with both end edge portions. In an outer wall board joint structure in which a seam treatment material is adhered so as to straddle between the outer wall board and a seam treatment material and the outer wall board is provided with an outer coat layer over the surface of the outer wall board, the outer coat film layer has elasticity. A seam treatment material comprising a deformable elastic acrylic silicon coating film.

[0010] According to such a configuration, the seam-treating material is bonded between the ends of the outer wall board. Further, an exterior coating layer is provided on the seam treatment material so as to straddle the outer surface of the outer wall board. And in the exterior coating layer,
An elastically deformable acrylic silicon coating is used.

[0011] Since the exterior coating layer is applied over the seam treatment material, the elastic acrylic silicon paint forming the coating film does not stop at the seam treatment material and does not enter between the edge portions. For this reason, the surface of the coating film is formed substantially flat between the edge portions.

For this reason, even if the outer wall board expands and contracts due to a temperature difference, a humidity difference, and the like, and the interval between the outer wall board edges (joints) changes due to vibration or the like, the outer coating film layer remains intact. Since it is made of an elastic material, it is possible to follow these fluctuations, and no crack is generated in the exterior coating film layer. In addition, since the elastic coating layer includes the elastic acrylic silicon coating film, the outer appearance of the joint is excellent without cracks such as cracks even during long-term use.

According to a second aspect of the present invention, in the outer wall board joint structure according to the first aspect, the elastic acrylic silicone coating film has an elongation percentage in a range of 50% to 500%. .

According to such a configuration, a suitable range of the elastic acrylic silicon coating film is set.

According to a third aspect of the present invention, a seam treatment material is bonded to opposing edge portions of adjacent outer wall boards so as to straddle between both end portions, and the seam treatment material and the outer wall board are bonded to each other. In an outer wall board joint structure in which an exterior coating layer is provided on the upper side over the surface, the exterior coating layer has an elongation percentage of 50% to 500% after exposure to ultraviolet rays by a sunshine weatherometer for 5000 hours. A seam treatment material characterized by including an elastic coating film capable of being elastically deformed.

According to such a configuration, the seam treatment material is bonded between the ends of the outer wall board. Further, an exterior coating layer is provided on the seam treatment material so as to straddle the outer surface of the outer wall board. And in the exterior coating layer,
An elastically deformable coating is used.

For this reason, even if the outer wall board expands and contracts due to a temperature difference, a humidity difference, and the like, and the interval between the outer wall board edge portions (joints) changes due to vibration or the like, the exterior coating film layer is formed. Since it is made of an elastic material, it is possible to follow these fluctuations, and no crack is generated in the exterior coating film layer. The elastic coating layer has an elongation of 50% to 5% after being exposed to ultraviolet rays by a sunshine weatherometer for 5000 hours.
Since it is configured to include the elastic coating film in the range of 00%, even when used for a long time, cracks such as cracks do not occur in the joint exterior, and the appearance is excellent.

According to a fourth aspect of the present invention, in the exterior coating layer, a plurality of elastically deformable elastic coatings are laminated, and the elastic acrylic silicon coating is disposed on the surface side of the laminated elastic coating. Claim 1 to Claim 3
The joint treatment material according to any one of the above.

According to such a configuration, even if a relatively inexpensive elastic paint is used in combination, the exterior is protected by the elastic acrylic silicone coating film. , And an outer wall joint structure with excellent appearance can be obtained.

According to a fifth aspect of the present invention, the elastic acrylic silicon coating film has a thickness of 100 μm to 200 μm.
The joint treatment material according to claim 4, wherein

According to such a configuration, even if a relatively inexpensive elastic paint is used, the exterior is protected by the elastic acrylic silicon coating film having a predetermined thickness, so that the joint exterior can be used for a long time. It is possible to obtain an outer wall joint structure having an excellent appearance without causing cracks such as cracks.

In the invention described in claim 6, the joint processing material is set so as to be able to follow even if the relative position between the both end portions changes. An outer wall board joint structure according to any one of claims 1 to 5.

According to this structure, a joint processing material that can follow a change in the relative position between the edge portions is used as the joint processing material. This joint processing material is integrally formed of, for example, an adhesive layer, a nonwoven fabric, an elastic sealing material, and the like.

[0024] Even if there is a change in the distance between the both end portions, the seam processing material can follow the change in the relative position between the edge portions, so that the seam processing material is cut or damaged. Nothing. Further, the seam treatment material expands and contracts following a change in the interval between the edge portions, and the exterior coating layer also expands and contracts as the seam treatment material expands and contracts. However, this variation is mitigated by the intermediate seam treatment material and transmitted to the exterior coating film layer. As a result, expansion and contraction of the outer wall coating layer is reduced, so that cracks such as cracks in the exterior do not occur for a longer period of time, and the appearance is improved for a longer period of time.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An outer wall board joint structure according to the present invention will be described below with reference to the drawings. In the drawings, the ratio of the thickness to the width is set larger for easy understanding.

FIG. 1 shows an example of the present invention. In the drawing, reference numeral 10 denotes an outer wall board joint structure of the present invention. The outer wall board joint structure 10 has opposite edge portions 1a, 1a of the adjacent outer wall board 1, and has both edge portions 1a.
The seam treatment material 11 adhered so as to straddle between the joints a and 1a (joint portion) 2, and the outer surface 12a formed on the seam treatment material 11 and the surface 1b of the outer wall board 1 over the surface 1b is flat. And an exterior coating layer (overcoat) 12.

As shown in FIG. 2, the joint processing material 11 has a band shape having a constant width L2 (about 50 mm to 200 mm).
An adhesive layer 13, a nonwoven fabric 14, and an elastic seal layer 16 composed of a reinforcing coating 15 are laminated. In the adhesive layer 13, a recess 13a is formed on the elastic seal layer 16 side, and a fluidized layer (stress relaxation layer) is formed in the recess 13a.
17 are provided. In the joint processing material 11, the pressure-sensitive adhesive layer 13 is covered with the double-sided release paper 18 from the viewpoint of production, operation, storage, and the like.

The adhesive layer 13 is made of an adhesive mainly composed of an acrylic resin, polyvinyl acetate or the like, and has a thickness of about 20 μm to 50 μm. As the nonwoven fabric 14, a nonwoven fabric made of a fiber material such as nylon, polyester, rayon, polyacrylate, polypropylene, vinylon, polyethylene, polyurethane, cupra, or other synthetic fiber, or natural fiber is used. m ² .

As the reinforcing coating 15, a coating film such as an elastic coating material such as acrylic rubber, polychloroprene rubber, polyurethane rubber or the like is used, and its thickness is 100 μm to 2 μm.
It is about 00 μm. Further, as the fluidized bed (stress relieving layer) 17, a resin such as silicone resin or fluororesin having a power to relieve fluidity or transmission of stress is used, and has a thickness of about 10 μm and a width of 10 mm to 10 mm. 20mm
It is about.

The seam treatment material 11 having such a configuration is obtained by applying an undercoat on the outer wall board 1 which has been subjected to the base treatment.
Pasted. In this case, the double-sided release paper 18 is peeled off, and the adhesive layer 13 is adhered so as to straddle both edge portions 1 a of both outer wall boards 1.

In the present invention, an elastic acrylic silicon coating is applied thereon as an exterior coating layer 12 over the seam treatment material 11 and the surface 1 b of the outer wall board 1.

Here, elasticity means that the coating film can be elastically deformed, and when expressed by the elongation percentage at break of the coating film, the elongation percentage of the coating film is in the range of 50% to 500%. Are preferred. If the elongation of the coating film is small, the joint 2
Of the exterior coating layer 12 in the vicinity of the joint portion 2 is cracked. on the other hand,
If the elongation of the coating film is increased more than necessary,
On the contrary, the strength of the outer surface 2a itself is reduced, and the damage resistance of the outer surface 12a is reduced. In addition, contaminants in the air are
2a, and the stain resistance of the outer surface 12a is reduced. The preferred elongation of the coating is in the range of 100% to 300%.

Here, the elongation percentage of this coating film is determined according to JIS K
It is a value measured according to the method for measuring the elongation of a coating film according to the general test method for coatings of No. 5400, and indicates the elongation of the coating film at a temperature of 20 ° C.

Such an elastic acrylic silicone coating film is mainly composed of a coating material containing an appropriate acrylic silicone (acrylic silicone) resin as a main component.

Here, the elastic acrylic silicone resin is composed of a resin mainly composed of an acrylic resin having a hydrolyzable silyl group in a side chain. This resin comprises a polymerizable monomer having a polymerizable group and a hydrolyzable silyl group (meth)
It can be obtained by copolymerizing with another polymerizable monomer such as an acrylic ester or a styrene monomer.

Here, as the hydrolyzable silyl group, an alkoxyl group is generally used. Examples of the alkoxyl group include lower alkoxyl groups such as a methoxy group and an ethoxy group, with a methoxy group being preferred. The hydrolyzable silyl group is hydrolyzed by moisture in the air at room temperature to generate a silanol group. This is dehydrated and condensed, whereby the molecules are crosslinked to form an elastic acrylic silicone coating film having elasticity.

Such an elastic acrylic silicone paint is a paint obtained by using the above-described acrylic silicone resin as a main component by a commonly known technique in the paint industry, and includes a color pigment, an extender pigment, and, if necessary, a normal paint. And various additives that can be incorporated into the composition. The form of the paint may be any type such as a solvent type or an aqueous emulsion type, but the aqueous emulsion type may have good workability.

As such coloring pigments and extender pigments,
Examples include inorganic pigments such as titanium oxide, zinc oxide, ocher, and ultramarine, and organic pigments such as azo, naphthol, anthraquinone, quinacridone, and phthalocyanine.

Examples of the various additives include a plasticizer, a preservative, an antifungal agent, an antialgal agent, an antifoaming agent, a leveling agent, a pigment dispersant, an antisettling agent, an anti-sagging agent, and an ultraviolet absorber. Can be

The elastic acrylic silicone paint provided in the form of an aqueous emulsion is prepared by, for example, emulsion-polymerizing a polymerizable monomer and a silanol group-containing (meth) acrylsiloxane in an aqueous medium in the presence of a reactive surfactant. Is obtained by Such a paint is described, for example, in JP-A-9-87586. Here, as the polymerizable monomer, a monomer that forms either a thermoplastic polymer or a rubber elastic polymer is exemplified, and mainly by appropriately selecting the type and mixing ratio of these polymerizable monomers, It is possible to adjust the characteristics of the coating film.

Also, for example, trade name Zemrak (manufactured by Kanegafuchi Chemical Industry Co., Ltd.), trade name glass coat (manufactured by Sanyo Chemical Industry Co., Ltd.), trade name Nanocryl (manufactured by Toyo Ink Co., Ltd.), trade name Yodozol (manufactured by NSC Japan) By adjusting the elasticity as appropriate from an acrylic silicone resin commercially available as, for example, it is also possible to obtain an elastic acrylic silicone coating film having the desired elongation rate in the present invention.

Such an elastic acrylic silicone paint can be used as a coating film layer by a conventionally known method. For example, brush coating, spray coating, roller coating, or the like can be used.

The thickness of this coating film is usually 200 μm or more, preferably 500 μm, in order to cover the step of the joint 2.
It is preferable to apply a thickness of about μm. For example, a flat spray coating is performed on the elastic acrylic silicon paint with a thickness of 300 μm to 500 μm. Furthermore, it may be an elastic acrylic silicone paints as a multilayer, such as performing a pattern intermediate coating weight of ^{500g / m 2 ~700g / m 2} .

Further, the elastic acrylic paint may be coated in an amount of 100 μm to 4 μm.
It may be applied in the range of 00 μm, and then an elastic acrylic silicone paint may be applied thereon in a thickness of about 100 μm to 200 μm, and the thickness of the entire laminated elastic coating may be set to about 500 μm. With this configuration, even when a relatively inexpensive elastic acrylic paint is used in combination, the exterior is protected by the elastic acrylic silicone paint film of a predetermined thickness, and the elastic acrylic paint and the elastic acrylic silicone paint are laminated with good adhesion. Since the coating film is formed, it is possible to obtain an outer wall joint structure having an excellent appearance without causing cracks such as cracks in the joint exterior even in long-term use.

Of course, these configurations are merely examples,
Various coating materials other than those described above can be used to obtain a desired coating appearance, and the coating film thickness, coating amount, and the like can be set according to the purpose. For example, even if the elastic acrylic paint is substituted with another elastic paint, it is possible to obtain a good effect of the elastic acrylic silicone coating film.

Next, the operation of the thus constructed outer wall board joint structure will be described.

According to such a configuration, the seam treatment material 11 is stretched across the end portions 1a, 1a (joint portion 2) of the outer wall board 1.
Is glued. This seam treatment material 11 has an edge 1
It can follow the change in the relative position between a and 1a. An exterior coating layer 12 is provided on the joint processing material 11 so as to extend over the outer surface 1b. The exterior coating layer 12 is made of an elastically deformable acrylic silicon coating.

Since the exterior coating film layer 12 is applied over the seam treatment material 11, the elastic acrylic silicone paint forming the coating film stops at the seam treatment material 11 and stops at the edge portion 1
There is no intrusion between a and 1a. For this reason, the outer surface 12a of the exterior coating layer 12 is formed substantially flat near the edge portions 1a, 1a (near joints), and a good appearance can be maintained.

Further, even if the outer wall board 1 expands and contracts due to a temperature difference, a humidity difference, or the like, or the distance between the outer wall board edge portions 1a, 1a (joint portion 2) fluctuates due to vibration or the like,
According to the joint processing material 11, since the joint processing material 11 can expand and contract in accordance with a change in the relative position between the edge portions 1a, the joint processing material 11 is not cut or damaged.

This variation is transmitted to the exterior coating layer 12, but is alleviated by the intermediate seam treatment material 11 and transmitted to the exterior coating layer 12.

As a result, the expansion and contraction of the outer wall coating layer 12 is reduced as compared with the case where a material having no fluctuation follow-up properties is used as the seam treatment material 11, and there is a possibility that cracks such as cracks on the exterior may occur. It is further reduced.

Further, since the exterior coating layer 12 is configured to include the elastic acrylic silicon coating, even if the exterior coating layer 12 is expanded and contracted in a long-term use, cracks such as cracks may occur. No appearance. In addition, although the thickness of the exterior coating layer 12 is configured to be thinner than other portions by the seam treatment material 11, there is no actual harm.

Next, a simulated durability test was performed as an outer wall board joint structure when the material of the exterior coating layer 12 was variously changed. The physical properties of the used raw material coating films are shown in Table 1, and the results of the durability test are shown in Table 2.

In Table 1, Experiment Nos. 1 to 5 show examples of acrylic silicone paints, and the difference in elongation was adjusted by variously changing the composition of the base material constituting the paints. Here, the paint of Experiment No. 1 has a low elongation and is substantially inelastic. As a control, an elastic paint containing a commercially available elastic acrylic resin as a main component was used.

[0055]

[Table 1]

[Table 2] In addition, the evaluation of the physical properties of the raw material coating films in Table 1 was based on JIS K54.
Specimens were prepared in accordance with “Coating general test method” of No. 00, and crack resistance was measured and the elongation of the coating film before and after irradiation with ultraviolet rays for 5000 hours was measured by a sunshine weatherometer.

For the crack resistance, the zero span tension value (mm) was measured by a tensile tester under the condition of a tensile speed of 200 mm / min in an atmosphere of -5 ° C. The measurement was performed at 20 ° C. The ultraviolet irradiation is performed according to JIS K 5400 “Coating general test method:
Light resistance (carbon arc lamp type) ".

The evaluation of the durability test as the outer wall board joint structure shown in Table 2 shows that the thickness of the exterior coating layer 12 was 500 μm.
The outer wall board joint structure shown in FIG. 1 was prepared as m, and a durability test was performed by an outdoor exposure test and an ultraviolet exposure test.

In the outdoor exposure test, the inclination angle was selected so that the outer surface 12a was upward, and the outdoor exposure was performed for one year in the south direction.

Stain resistance: The lightness of the exterior coating layer 12 near the joint 2 was measured with a color difference meter, and the initial lightness (L0 value) before exposure was measured.
And the lightness (L1 value) after the end of the exposure were evaluated, and evaluated by the lightness difference (ΔE = L0−L1). The smaller the difference in brightness, the better the stain resistance.

Appearance of coating film: Regarding the outer wall board joint structure, the appearance ΔΔ of the outer surface 12a near the joint 2 was visually observed, and the contamination was evaluated according to the following criteria.

：: Almost no trace of contamination is observed on the outer surface 12a.

Δ: Some trace of contamination was observed on the outer surface 12a.

X: Significant contamination was observed on the outer surface 12a.

In the ultraviolet irradiation test, an accelerated weather resistance test was conducted by irradiating ultraviolet rays for 9000 hours with a sunshine weatherometer.

Degree of crack: outer surface 12a near joint 2
Was evaluated for the degree of cracks according to the following criteria.

：: Good appearance without any change such as cracks visually observed.

Δ: Abnormalities such as cracks (small cracks), swelling, and peeling were observed on the outer surface 12a near the joint 2.

×: Appearance abnormalities such as remarkable cracks, blisters and peeling were visually observed.

Gloss retention: The gloss of an exterior coating film near joints was measured with a gloss meter according to JIS Z8741 (a method for measuring glossiness), and the initial value (G0) before irradiation and the value (G1) after irradiation were completed. ) And the gloss retention (%) (= G1 / G
0). The higher the gloss retention (%), the more
It is difficult to be contaminated, and it can be said that the contamination resistance is good.

Repeat fatigue test: A test piece obtained by repeatedly performing the fatigue test according to JIS A 1436 was visually observed for its appearance, and evaluated according to the degree of cracking, with three ranks of x: poor to o: good. .

As is clear from the results, the coating film was compared with the results of the outdoor exposure test and the UV (ultraviolet) irradiation test of the control example using the elastic acrylic coating film having a large elongation of 200%. When an elastic acrylic silicone coating film having an elongation percentage of 50% to 500% was used, the durability test as an outer wall board joint structure showed good results.

Although the embodiment of the present invention has been described in detail with reference to the drawings and test results, the specific configuration is not limited to this embodiment, and there are design changes and the like within a range not departing from the gist of the present invention. Even this is included in the present invention.

For example, a configuration using the seam treatment material shown in FIG. 3 instead of the seam treatment material of FIG. 2 can be adopted.

The seam treatment material 11 in FIG. 3 is different from the seam treatment material 11 shown in FIG. 2 in that the elastic sealing material 16 is composed of two layers of reinforcing coatings 15 and 15a and a nonwoven fabric 14, Recess 13 between reinforcement coating 15a and nonwoven fabric 14
a is provided with a fluidized bed 17. This reinforcing coating 15a has a thickness of about 30 μm.

The seam treatment material 11 is used by peeling off the release paper 18 and bonding it over the edge portions 1a, 1a as in the embodiment. When an elastic acrylic silicon coating similar to that of the embodiment is applied on the upper side as the exterior coating layer 12, the outer wall board joint treatment structure of the present invention is obtained.

FIGS. 4 and 5 show another modification of the outer wall board joint structure. As shown in FIG.
Opposite edge portions 1a, 1a of the outer wall board 1 are each formed with a stepped portion 1c which is recessed inward.
The groove 1d is formed by c. The joint processing material 19 is attached to both step portions 1c forming the bottom of the groove portion 1d. In addition, the code | symbol 20 in FIG.

As shown in FIG. 5, the joint processing material 19 has a band shape having a constant width L3 of about 8 mm.
2, an adhesive layer 23, a nonwoven fabric 24, a reinforcement coating 25, and a stress relaxation layer 26 are laminated. In this example, the elastic sealing material 27 is constituted by the nonwoven fabric 24 and the reinforcing coating 25, but the nonwoven fabric 24 in the elastic sealing material 27 is not always necessary, and the elastic sealing material is constituted only by the reinforcing coating 25. May be.

In the adhesive layer 23, a recess 23a is formed on the side of the reinforcing coating 25, and the stress relaxation layer 26 is formed in the recess 23a.
Is provided. The width L4 of the stress relaxation layer 26 is about 6
mm.

The reinforcing coating 25, the nonwoven fabric 24, the adhesive layer 2
3. The configuration of the stress relaxation layer 26 is the same as that of the embodiment.
The thickness of the joint processing material 19 is larger than that of the example of FIG. 1 and is set to about 500 μm to 1000 μm.

On the outer side, an elastic acrylic silicon coating as the exterior coating layer 12 is applied to the upper side of the seam treatment material 19 and the outer wall board 1 over the surface 1b. As the elastic acrylic silicon coating film, the same one as in the embodiment is exemplified.

The construction method of the outer wall board joint structure having such a configuration will be described.

First, an undercoat is applied to the outer wall board 1 on which the outer wall board 1 has been subjected to a base treatment, and a joint processing material 19 is attached. In this case, the double-sided release paper 22 is peeled off, and the adhesive layer 23 is adhered so as to straddle both step portions 1c of both end portions 1a, 1a of both outer wall boards 1.

Thereafter, from above, a putty material 28 having elasticity as an “elastic material” is applied so as to cover the joint processing material 19 in the groove 1 d and fill both sides of the processing material 19. The putty material 28 as an elastic material used here is made of an acrylic rubber, polychloroprene rubber, or polyurethane rubber-based material.

In such a case, the seam treatment material 1
By increasing the thickness by an amount corresponding to the decrease in the width L3 of No. 9, it is possible to ensure the followability when the relative positions of the both end portions 1a, 1a change. Further, since the putty material 28 having elasticity covers the joint processing material 19 so as to fill the groove portion 1d formed by the two step portions 1c, the corner portion 19
There is no occurrence of cracks or the like in the exterior coating film layer 12 at the portion a, or the occurrence of the corner portion 19a protruding to lower the appearance quality.

The other operations are substantially the same as those of the embodiment, and therefore the detailed description is omitted.

[0086]

As described above, according to the first aspect of the present invention, there is provided an outer wall board having an excellent appearance in which cracks such as cracks do not occur in the joint exterior even after long-term use. A seam structure is obtained.

According to the second aspect of the present invention, a suitable range of the elastic acrylic silicon coating film is set.

According to the third aspect of the present invention, the temperature difference,
Even if the outer wall board expands and contracts due to a difference in humidity, or even if the distance between the outer wall edge portions (joint portions) fluctuates due to vibration or the like, the exterior coating layer is made of an elastic material. These fluctuations can be followed, and no crack is generated in the exterior coating film layer. In addition, since the elastic coating layer has an elastic coating having an elongation percentage after exposure to ultraviolet rays for 5000 hours with a sunshine weatherometer in the range of 50% to 500%, the elastic coating layer can be used for a long period of time. The external appearance is excellent without cracks or the like occurring on the exterior part.

According to the fourth aspect of the present invention, even if a relatively inexpensive elastic paint is used in combination, the exterior is protected by the elastic acrylic silicone coating film, so that the joint exterior is cracked even when used for a long time. Thus, an outer wall seam structure having an excellent appearance can be obtained without causing any cracks.

According to the fifth aspect of the present invention, even when a relatively inexpensive elastic paint is used in combination, the exterior is protected by the elastic acrylic silicone coating having a predetermined thickness, so that it can be used for a long time. An outer wall joint structure having an excellent appearance can be obtained without causing cracks such as cracks in the joint portion exterior.

According to the sixth aspect of the present invention, even if there is a change in the distance between both end portions, the outer wall can be operated by the action of the joint processing material which can follow the change in the relative position between the end portions. Practical beneficial effects that the expansion and contraction of the coating layer is reduced, cracks such as cracks on the exterior do not occur over a long period of time, and the appearance also becomes excellent over a long period of time. Demonstrate.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an outer wall board joint structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a joint processing material used in the outer wall board joint structure of FIG. 1;

FIG. 3 is a cross-sectional view showing a modified example of the joint processing material.

FIG. 4 is a sectional view showing a modified example of the outer wall board joint structure of the present invention.

FIG. 5 is a cross-sectional view of a joint processing material used in the outer wall board joint structure of FIG. 4;

FIG. 6 is a cross-sectional view of an outer wall board joint structure for explaining a conventional example of an outer wall board joint processing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer wall board 1a Edge 11 Joint processing material 12 Exterior coating layer 13 Adhesive layer 14 Nonwoven fabric 15 Reinforcement coating 16 Elastic sealing material

Claims (6)

[Claims] 1. A seam treatment material is bonded to opposing edge portions of adjacent outer wall boards so as to straddle between both edge portions, and a seam is straddled over the surface of the seam treatment material and the outer wall board. In the outer wall board joint structure provided with a coating layer, the exterior coating layer includes an elastic acrylic silicone coating film that can be elastically deformed. 2. The outer wall board joint structure according to claim 1, wherein the elastic acrylic silicone coating has an elongation in a range of 50% to 500%. 3. A seam treatment material is bonded to opposing edge portions of adjacent outer wall boards so as to straddle between both edge portions, and is provided over the seam treatment material and the surface of the outer wall board. In the outer wall board joint structure provided with the coating layer, the exterior coating layer has an elongation percentage of 50% to 500 after exposure to ultraviolet rays for 5000 hours by a sunshine weatherometer.
%, Comprising a resilient coating capable of being elastically deformed in the range of%. 4. The exterior coating film layer is characterized in that a plurality of elastically deformable elastic coating films are laminated, and the elastic acrylic silicon coating film is disposed on the surface side of the laminated elastic coating film. The joint treatment material according to any one of claims 1 to 3. 5. The seam treatment material according to claim 4, wherein the thickness of the elastic acrylic silicon coating film is in a range of 100 μm to 200 μm. 6. The seam processing material according to claim 1, wherein the seam processing material is set so as to be able to follow even if the relative position between the both end portions changes. Outer wall board seam structure.