JP4410610B2 - Caulking material construction method and outer wall structure - Google Patents

Description

  The present invention relates to a caulking material construction method and an outer wall structure, and more specifically, a joint provided at a side end of an exterior member in which an exterior wall surface of a building is finished by constructing an exterior member such as a cement board. The construction method of the caulking material that fills the gap and the structure of the outer wall having such an exterior member and the caulking material are targeted.

An exterior wall surface of a building such as a house is arranged and finished by arranging exterior plate materials such as cement boards. The outer wall finishing structure with such an exterior plate material has many advantages such as efficient construction, excellent outer wall surface durability, and good surface appearance design. It is known.
The formation of an inorganic coating film on the surface of an exterior plate material improves the waterproofness, weather resistance, stain resistance, and the like.
Patent Document 1 proposes a technique of applying a metal alkoxide-based color paint on a cementitious outer wall material and then applying a metal alkoxide-based clear paint thereon. It has a two-layer structure of a colored inorganic coating layer and a clear inorganic coating layer. While the colored inorganic coating layer improves the appearance design, the clear inorganic coating layer improves the surface texture and improves the durability.

In the finish construction of the outer wall surface by the exterior plate material, a joint gap having a certain width is provided between the side edges of the laid exterior plate material. This joint gap serves to absorb variations in dimensions and mounting positions of the exterior plate material, and to prevent the exterior plate material from being cracked or cracked due to deformation or movement after construction. There is also an effect on the appearance design.
Such joint gaps in the exterior plate material are filled with a caulking material. The caulking material is a putty-like curing material, and the caulking material in a fluid state is filled into the joint gaps of the exterior plate material using an injection gun or the like and cured. The construction of the caulking material provides a sealing function that can prevent rainwater and the like from entering through the joint gaps of the exterior plate material. The caulking material is elastically deformable, and the sealing function is not lowered in response to fluctuations in the joint gap due to deformation or movement of the exterior plate material.

In the joint processing operation in which the caulking material is buried in the joint gap, masking tape is pasted on the surface of the exterior plate material adjacent to both sides of the joint gap. As a result, it is possible to prevent the caulking material from adhering to the surface of the exterior plate material and becoming dirty.
Japanese Patent Laid-Open No. 10-238063

When the jointing operation with the caulking material described above is performed on the outer wall made of the exterior plate material that has been surface-finished with the inorganic coating film, the inorganic coating film on the portion where the masking tape is applied peels into small dots. As a result, the surface appearance of the exterior plate material is impaired, and the waterproofness, weather resistance, contamination resistance, and the like realized by the inorganic coating film are reduced.
When the reason why such a problem occurs was examined, if there is a place where the adhesion of the inorganic coating to the exterior plate material is locally weak, when the masking tape is peeled off, a part of the inorganic coating is peeled off together with the masking tape. It turned out that.
The above problem is likely to occur when a colored inorganic coating layer is formed on the surface of the exterior plate material as the inorganic coating, and then a clear inorganic coating layer is formed thereon. In a relatively hard clear inorganic coating layer, fine cracks called microcracks may occur over time. Water such as rainwater enters from the microcracks and reaches the colored inorganic coating layer. When the moisture that has reached the colored inorganic coating layer is absorbed by the pigment as the coloring component, the adhesive strength with the exterior plate material decreases at this pigment portion. When the masking tape described above is applied and then peeled off, the pigment portion of the colored inorganic coating layer having reduced adhesive strength is peeled off from the exterior plate material. The colored inorganic coating film layer and the clear inorganic coating film layer are peeled off at fine dot-like portions where the pigment is in contact with the exterior plate material. As a result, the above-described point-like peeling occurs.

Therefore, the greater the proportion of the pigment component contained in the colored inorganic coating film layer, the easier the dot peeling occurs in the inorganic coating layer when the masking tape is peeled off.
The object of the present invention is to prevent the inorganic coating layer from peeling off even when jointing with a caulking material is performed on an exterior member made of a cement board or the like that has been surface-finished with an inorganic coating layer. It is.

  The construction method of the caulking material according to the present invention is a construction method of the caulking material that fills the joint gap provided at the side edge of the exterior member whose surface is coated with the inorganic coating layer on the outer wall surface of the building, A step (a) of forming an organic clear coating layer on the surface of the inorganic coating layer of the exterior member with a predetermined width along a side adjacent to the joint gap; and after the step (a) In the step (b) of applying a masking tape along the side adjacent to the joint gap on the organic clear coating layer, and after the step (b), the joint gap is filled with a caulking material. And a step (d) of peeling the masking tape after the step (c).

[Outer wall surface of the building]
If it has an outer wall surface with a structure for performing caulking material construction, it can be applied to various buildings such as houses.
An outer wall surface is a wall structure that faces the outside of a building. The outer wall surface includes not only a general side wall that partitions the interior and the outdoors, but also a roof surface, an eaves lower surface, a column surface, a floor surface, and the like.
The outer wall surface is finished with an exterior member. The exterior member may be directly applied to the surface of an internal structure such as a building structure or a frame structure of a building, but is usually applied via an exterior base material.

As the exterior base material, gypsum board and various ceramic boards are used as in normal construction.
[Exterior material]
The exterior member currently used for the finishing of the outer wall surface in a normal building is used.
The exterior member usually has a fixed plate shape such as a rectangle, and such exterior plate materials are arranged side by side. Depending on the shape of the outer wall surface and the external design requirements, exterior plate materials other than rectangles are also used. Some have a flat plate shape instead of a flat plate shape or a curved plate shape. There may be provided a concavo-convex structure or a step structure used for attaching or connecting the exterior member.

The material of the exterior member may be the same as that of a normal architectural exterior member. For example, there are cement hardened plates, lightweight concrete plates, ceramic plates and the like. Materials known as ceramic boards for exterior use can be used.
[Joint gap]
In order to construct the exterior member on the outer wall surface, a certain gap is left between the exterior members. This gap or joint gap absorbs variations in shape and dimensions that are unavoidable in the manufacture of exterior members, makes the unevenness and inclination in the thickness direction unavoidable during installation inconspicuous, and causes external forces such as earthquakes after construction. There is a function of preventing the exterior member from colliding and being damaged by the movement of the generated deformation or displacement.

The size of the joint gap varies depending on the construction conditions, but is usually set in a range of 6 to 20 mm in width. The depth of the joint gap varies depending on the thickness of the exterior member.
When the exterior member is a fixed exterior plate material, joint gaps are often arranged evenly between the side edges of the exterior plate material. In the case of a rectangular exterior plate material, grid-like joint gaps are provided vertically and horizontally. Depending on the shape of the exterior plate material, construction conditions, etc., the width and depth of the joint gap may vary depending on the location. In some cases, joint gaps are provided not only on the entire circumference of the exterior member but only on a part of the sides. A joint gap may be provided not only between the same type of exterior members but also between exterior members of different materials and structures. For example, between the exterior plate material and the curtain plate, between the exterior plate material and the window sash, between the exterior plate material and the column material or the base, and the like can be mentioned.

[Inorganic coating layer]
It is formed by coating and curing on the surface of the exterior member. There are functions for protecting the surface of the exterior member and improving the appearance design. Specifically, waterproofing and contamination resistance can be imparted to the surface of the exterior member that is porous and easily absorbs water and is easily soiled. With respect to an exterior member that can be easily scraped into powder by friction, it is possible to increase the friction resistance and prevent dropping or peeling. The smoothness of the surface can be improved and the surface texture can be improved. The chemical resistance and ultraviolet resistance of the surface can be improved. At least one of these functions is performed.
As the inorganic coating layer, a plurality of inorganic coating layers having different compositions can be combined. For example, an inorganic clear coating layer and an inorganic colored coating layer can be employed. Clear coating layers or colored coating layers having different blending can also be combined.

It is desirable to dispose an inorganic clear coating layer on the outermost surface of the inorganic coating layer.
[Inorganic clear coating layer]
It fulfills the function of protecting the surface of the exterior member. In particular, it has a function of improving surface characteristics such as waterproofness and contamination resistance.
As a material for the inorganic clear coating layer, an inorganic clear paint used for protecting a normal exterior member can be used.
Specific examples of the inorganic clear paint include the following paints.
(1) Solvent 2-pack metal alkoxide 100% inorganic clear paint.

(2) Solvent two-component inorganic / organic hybrid clear paint.
(3) Water based two-component inorganic / organic hybrid clear paint.
(4) Water-based 1-component inorganic / organic hybrid clear paint.
Although the thickness of an inorganic clear coating film layer changes with construction conditions, it is normally set to 10-30 micrometers by dry thickness.
The inorganic clear coating film layer can be directly formed on the surface of the exterior member, but is usually formed on the surface of the exterior member via a high pigment sealer layer.
[High pigment sealer layer]
Basically, the same material or manufacturing method as the sealer agent in ordinary paints and coating agents is applied. Covering the surface of the exterior member, the pores and irregularities present on the surface of the exterior member can be filled. A uniform surface color can be obtained by eliminating unevenness and variations in the surface color of the exterior member. Even if it is an inorganic clear paint which is difficult to form directly on the surface of the exterior member, the formation is facilitated through the high pigment sealer layer.

The high pigment sealer layer has a high pigment content. Specifically, it contains 60 to 85% by weight of pigment in the solid content. Since the pigment content is large, the various functions described above can be exhibited well. As the pigment, both colored pigments and extender pigments can be used. Of course, both can be blended. Specific examples include pigments such as acrylic urethane, acrylic silicon, and acrylic epoxy.
As the high pigment sealer coating material, those having good coating properties of the inorganic clear coating formed thereon and strong integration with the formed inorganic clear coating layer are preferable. Specific examples include a solvent two-component acrylic urethane sealer, a solvent two-component acrylic silicon sealer, and a solvent two-component acrylic epoxy sealer.

The thickness of the high pigment sealer layer varies depending on the construction conditions, but is usually set to 20 to 50 μm in dry thickness.
[Organic clear coating layer]
Basically, the same materials, manufacturing techniques, and coating techniques as organic clear coating layers that are used for finishing exterior walls and the like in normal construction can be applied.
Those having good releasability of the masking tape applied thereon are preferred. It is desirable that the integrity or bondability to the inorganic coating layer such as the inorganic clear coating layer and the high pigment sealer layer is good. The thing with the high permeability to the micro crack which exists in an inorganic clear coating film layer is preferable.

Specifically, organic clear paints such as acrylic silicon, acrylic urethane, and epoxy-modified acrylic can be used. More specifically, a solvent two-part acrylic silicone clear paint can be used. The organic clear paint is desirably used at a dilution of 50 to 300%.
The organic clear coating layer is formed with a predetermined width along the side adjacent to the joint gap in the surface of the inorganic coating layer formed on the exterior member. If the side adjacent to the joint gap of the exterior member is a straight line, the organic clear coating layer can also be formed in a straight line. If the said side is a bend line or a curve, an organic clear coating layer can also respond | correspond to it. However, the shape of the organic clear coating layer can be changed depending on the application form of the masking tape to be applied thereon.

The width of the organic clear coating layer is set to be the same as or slightly wider than the width of the masking tape to be applied thereon. Usually, the width is set to 20 to 40 mm. Although it is possible to form an organic clear coating layer on the entire surface of the inorganic coating layer, the portion where the masking tape is not applied is wasted. Even on the side of the exterior member, it is not necessary to form an organic clear coating layer at a location where the masking tape is not applied when the caulking material is applied.
The thickness of the organic clear coating layer may be such that the masking tape and the inorganic coating layer can be reliably separated. When the masking tape is peeled off, the inorganic coating layer is not peeled off together. Although specific thickness changes also with construction conditions, it is normally set to 5-30 micrometers of dry thickness. Preferably, it is 10-20 micrometers.

What the peeling strength of an organic clear coating film layer is 10-50 N / cm < ² > is preferable.
〔Masking tape〕
Attached along the side adjacent to the joint gap on the organic clear coating layer.
Basically, the masking tape used for the construction of ordinary caulking material can be used. It is made of a material that is difficult to be attacked by or penetrated by components contained in the caulking material.
The material on the front side of the masking tape is compatible with the caulking materials described above, and the material on the back side has adhesiveness to the organic clear coating layer and has good peelability from the organic clear coating layer. A material that does not attack the organic clear coating layer is used. Commercially available products can be used as masking tapes for caulking materials.

The width of the masking tape is sufficient if it covers the range where the caulking material may adhere outside the joint gap. Usually, it has a width of about 10 to 30 mm. In accordance with the width of the organic clear coating layer, it is set so as not to protrude outside the organic clear coating layer.
When the side of the exterior member is not a straight line but a curved line or a bent line, the side of the masking tape can be used by cutting it according to the shape of the side of the exterior member. The masking tape may be partially shifted and overlapped to correspond to the side shape of the exterior member. Of the both sides of the masking tape, the shape of the side far from the side of the exterior member does not need to be exactly matched to the shape of the side of the exterior member as long as the width of the masking tape is sufficiently secured.

[Caulking material]
Caulking materials used for ordinary architectural exterior finishes can be used.
In general, modified silicone, modified urethane, silicone, urethane, acrylic and the like are used as the caulking material.
[Construction method]
Basically, ordinary caulking material construction techniques are applied. The point that the organic clear coating layer is formed before the masking tape is applied is different from the construction technology of ordinary caulking materials.
In the construction of caulking materials, in newly constructed buildings, after installing exterior members on the outer wall surface, the joint gaps provided between the exterior members are filled with caulking materials. There is a case of repairing the caulking material due to damage. The present invention is particularly useful in the case of repair work. In the repair work, the existing caulking material is peeled off, whereas in the new construction, there is no work.

The work of peeling off the existing caulking material is done by inserting a hard tool into the caulking material in the joint gap and scraping it off. Remove any caulking material remaining behind the joints. The tools and work procedures used are the same as for normal repair work.
The following operations are common to new installations and repairs.
Step of forming organic clear coating layer (a):
An organic clear paint for forming an organic clear coating layer is prepared and applied in a predetermined procedure. Masking tape is not used when applying organic clear paint. It can be done manually using a brush or roller. The side edge adjacent to the joint gap can be accurately positioned by the end face of the exterior member. It is not necessary to coat the side farther from the joint gap so accurately. It is only necessary to cover the area to which the masking tape is to be applied, and apply it in a range with a little margin. A simple pattern or mask sheet can be placed on the inorganic coating layer, and an organic clear paint can be sprayed or roller-coated on top of it. The pattern paper or mask sheet is left floating from the inorganic coating layer or is not strongly adhered.

Part of the organic clear coating penetrates into the microcracks present in the inorganic clear coating layer of the inorganic coating layer, and further, on the high pigment sealer layer coated on the back side of the inorganic clear coating layer To reach. In addition, it is desirable to apply a sufficient amount of organic clear coating so that a coating layer having a necessary thickness is formed on the surface of the inorganic clear coating layer. However, the amount of organic clear paint penetrating into the microcracks of the inorganic clear coating layer and the high pigment sealer layer is very small. There is no need to apply a particularly large amount of paint.
The organic clear paint is sufficiently dried and cured. It is desirable to take a sufficient time in order to sufficiently penetrate the microcracks of the inorganic coating layer. Dry until the organic clear coating layer and the inorganic clear coating layer or the high pigment sealer layer are fully integrated and the surface of the organic clear coating layer does not show strong adhesion to the masking tape. Harden. Usually, the drying time after coating may be 4 hours or more.

Masking tape application process (b):
If the organic clear coating layer is formed in an appropriate range, it can be carried out in the same manner as a normal masking tape attaching operation. Prevent masking tape from being applied directly to the surface of the inorganic coating layer.
Caulking material filling step (c):
Using a caulking gun or an injection device, fill the joint gap with caulking material. Since the side of the exterior member adjacent to the joint gap is covered with the masking tape, there is no problem even if it protrudes a little from the joint gap. In order to reliably fill the depth of the joint gap and to fill the joint gap with a sufficient amount so that there is no air pocket or gap inside the joint gap, it may be better to fill the joint gap just beyond the joint gap. However, the caulking material should not be attached to the organic clear coating layer or the inorganic coating layer outside the masking tape.

After caulking material is filled in the joint gap, the surface of the caulking material is smoothed, shaped, excess caulking material is removed, or the caulking material is pressed against the bottom of the joint gap. Post-treatment processing similar to the above construction can be performed.
Masking tape peeling step (d):
The masking tape can be peeled off after or before the caulking material is dry-cured. If the caulking material has adhered from the joint gap to the top of the masking tape, the caulking material that has adhered to the masking tape can be removed from the joint gap by removing the masking tape before the caulking material is cured. . The masking tape can be separated from the joint gap with a knife so that the caulking material in the joint gap is not peeled off when the masking tape is peeled off.

When the masking tape is peeled off and the caulking material is sufficiently dried and cured, the construction of the caulking material is completed.
The organic clear coating layer may be left on the surface of the exterior member.
[Outer wall structure]
The structure of the outer wall on which the caulking material has been constructed has the following configuration.
The exterior member is constructed on the outer wall surface of the building, and the caulking material is buried in the joint gap provided at the side end of the exterior member. An inorganic coating layer coated on the surface of the exterior member via a high pigment sealer layer, and the surface of the inorganic coating layer is formed with a predetermined width along the side of the exterior member adjacent to the joint gap. An organic clear coating layer.

As described above, since the organic clear coating layer is transparent, the appearance of the organic clear coating layer is hardly noticeable in appearance. It can be considered that there is no difference in appearance between the exposed surface of the inorganic coating layer and the coating surface of the organic clear coating layer. There is no difference from a normal outer wall structure without an organic clear coating layer.
In addition to the inorganic coating layer, the organic clear coating layer can also serve to protect the vicinity of the side of the exterior member. Since the sides of the exterior member are easily damaged and chipped or scraped, protection by the organic clear coating layer is useful for maintaining the quality performance of the exterior member.
If it is necessary to repair the caulking material again on the outer wall structure once the clear organic coating layer was formed and the caulking material was applied, use the already formed organic clear coating layer. be able to. In this case, the masking tape can be applied as it is on the organic clear coating layer, and the caulking material can be filled. Even if the masking tape is peeled off, the possibility that the inorganic clear coating film layer or the high pigment sealer layer protected by the organic clear coating film layer is peeled off is low. Even if new microcracks are generated in the inorganic clear coating layer over time after the organic clear coating layer is formed, if the organic clear coating layer is covered with the organic clear coating layer, it is difficult to cause peeling.

  However, the organic clear coating layer is weakened over time, the micro-cracks of the inorganic clear coating layer are present in large quantities, the bonding force to the exterior member is reduced, or the micro-crack is an organic clear coating layer If it passes to the surface, the inorganic clear coating layer may be peeled off when the masking tape is applied and peeled off. If there is such a concern, the organic clear coating layer can be formed again before applying the masking tape. The organic clear coating can prevent the entire inorganic coating layer from peeling off by penetrating into the microcracks leading from the previously formed organic clear coating layer to the inorganic clear coating layer.

In the construction method of the caulking material according to the present invention, an organic clear coating film layer is formed on the surface of the exterior member to which the masking tape is applied in the operation of filling the caulking material in the joint gap. The organic clear coating layer protects the inorganic coating layer coated on the surface of the exterior member. When the filling of the caulking material is completed and the masking tape is peeled off, it is possible to prevent the inorganic coating film layer from being peeled off together with the masking tape.
In particular, when an organic clear coating is infiltrated from the microcracks of the inorganic clear coating layer constituting the inorganic coating layer to the pigment portion of the high pigment sealer layer, the adhesive force between the pigment portion and the surface of the exterior member is increased. Be enhanced. The overall film strength of the high pigment sealer layer, the bonding strength between the high pigment sealer layer and the inorganic clear coating layer are increased, and the strength reduction due to microcracks in the inorganic clear coating layer is also improved. As a result, even when a large peeling force is applied when the masking tape is peeled off, it is possible to reliably prevent the inorganic clear coating film layer and the high pigment sealer layer from being peeled off at the pigment portion of the high pigment sealer layer.

After the construction of the caulking material is completed, the transparent organic clear coating layer does not impair the surface appearance of the inorganic coating layer that covers the entire surface of the exterior member.
As a result, even if the construction of the caulking material is repeated, the appearance quality of the exterior member and the outer wall surface is not impaired, and the protective function of the exterior member by the inorganic coating layer can be exhibited well.

The embodiment shown in FIGS. 1 and 2 shows a case in which a caulking material that has been constructed at the time of new construction is reconstructed for repair on the outer wall surface of a building that is finished by pasting an exterior plate material.
[Basic structure of outer wall surface]
On the surface of the exterior base material 12 constituting the outer wall surface of the building, a rectangular exterior plate material 10 is arranged side by side in the front-rear and left-right directions. As the exterior base material 12, a base material such as a gypsum board is used. The exterior board material 10 is a ceramic siding board such as a cement hardened board.
The exterior board | plate material 10 is arrange | positioned with the joint gap 14 of the fixed width | variety opened between each other. Although the illustration of the attachment of the exterior plate member 10 to the exterior base material 12 is omitted, the exterior plate member 10 is fixed by screw nails, nails, or other fasteners.

As shown in FIG. 1, a high pigment sealer layer 22 and an inorganic clear coating layer 24 are formed on the surface of the exterior plate member 10 as inorganic coating layers. The high pigment sealer layer 22 has a function of filling the irregularities and holes existing on the surface of the exterior plate material 10 to make the surface flat, and making the inorganic clear coating film layer 24 be applied satisfactorily. Moreover, the surface color of the exterior board | plate material 10 can be set to a color with high external appearance design property. The inorganic clear coating film layer 24 protects the surface of the exterior board material 10 and improves water resistance, weather resistance, and contamination resistance.
The caulking material 50 is filled and hardened in the joint gaps 14 existing at the side edges of the exterior plate material 10. The caulking material 50 loses its elasticity or becomes brittle over time due to the influence of solar radiation or the like. Specifically, all the caulking materials 50 that have been constructed are removed. Thereafter, a new caulking material 50 is filled again.

[Construction of caulking material]
Before performing the filling operation of the caulking material 50, the organic clear coating layer 30 is applied.
As shown in FIG. 2, the organic clear coating film layer 30 is formed in a thin strip shape along the side of the exterior plate material 10 adjacent to the joint gap 14. Specifically, an organic acrylic silicon-based clear paint is applied and formed with a width of about 20 to 40 mm and a dry thickness of 5 to 20 μm. When the organic clear coating layer 30 is applied, a masking tape or the like for accurately defining the width may not be used. There may be some variation in the width of the organic clear coating layer 30.
After the organic clear coating layer 30 is sufficiently dried and cured, the masking tape 40 is pasted on the organic clear coating layer 30. The material of the masking tape 40 and the affixing method are common to the construction of the normal caulking material 50. The masking tape 40 is stuck on the organic clear coating layer 30 so as not to protrude from the exposed surface of the inorganic clear coating layer 24.

After the application of the masking tape 40 is completed, the caulking material 50 is filled into the joint gap 14. The caulking material 50 may be the same as that which has been constructed before repair. Of course, it can also be changed to a coking material with better performance. In the filling operation of the caulking material 50, the caulking material 50 is brought into contact with the entire inner surface of the joint gap 14 and is filled with a sufficient amount. A portion of the caulking material 50 may protrude from the masking tape 40 outside the joint gap 14.
After the filling of the caulking material 50 is finished, the surface of the caulking material 50 in the joint gap 14 is leveled, or the caulking material 50 protruding on the masking tape 40 is pushed into the joint gap 14 side, so that the caulking material 50 Adjust the appearance. A small amount of the caulking material 50 may remain attached on the masking tape 40.

Thereafter, the solvent contained in the caulking material 50 evaporates or the caulking material 50 is cured. When shrinking at the time of curing, the surface of the caulking material 50 may be slightly depressed.
The masking tape 40 may be peeled off and removed before the caulking material 50 is completely cured. The caulking material 50 that protrudes from the joint gap 14 to the surface of the masking tape 40 is removed together with the removal of the masking tape 40.
The masking tape 40 is easily peeled off from the surface of the organic clear coating film layer 30. The organic clear coating layer 30 and the underlying inorganic clear coating layer 24 and the high pigment sealer layer 22 are not peeled off together with the masking tape 40.

The reason is considered as follows.
<Function of organic clear coating layer>
At the time of forming the organic clear coating layer 30, the organic clear coating penetrates into the gaps of the microcracks existing in the inorganic clear coating layer 24. The organic clear paint penetrates through the thickness of the inorganic clear coating layer 24 and reaches a part of the high pigment sealer layer 22 existing on the back side thereof. The organic clear paint penetrates into the pigment portion of the high pigment sealer layer 22. The organic clear paint also permeates the portion where the pigment is in contact with the exterior member 10.
Thereafter, the cured organic clear coating fills the microcracks present in the inorganic clear coating layer 24, reinforces the pigment portion of the high pigment sealer layer 22, and increases the bonding strength between the pigment portion and the exterior member 10. From the high pigment sealer layer 22 to the organic clear coating film layer 24 through the inorganic clear coating film layer 24, it is strongly integrally joined. As a result, even if a force for peeling the masking tape 40 is applied, it is reliably prevented that only a part of the inorganic clear coating film layer 24 and the high pigment sealer layer 22 is peeled off in the form of dots.

Since the organic clear coating layer 30 is relatively excellent in elastic deformability, the inorganic clear coating layer 30 is strongly joined integrally with the inorganic clear coating layer 24 inferior in relatively elastic deformability. The brittleness of the film layer 24 or the high pigment sealer layer 22 can be compensated for and the resistance to peeling can be increased. Even if the masking tape 50 is peeled off, the inorganic clear coating layer 24 becomes difficult to peel off.
[Other Embodiments]
(A) The organic clear coating film layer 30 can be formed in advance in a range where the masking tape 40 is applied not only when the caulking material 50 is repaired but also during the construction of the caulking material 50 at the time of new construction.

(B) Once the organic clear coating layer 30 is formed once on the surface of the inorganic clear coating layer 24, the caulking material 50 may be repaired a plurality of times, or the masking tape 50 may be repeatedly replaced. Can fulfill the desired function. However, since the organic clear coating layer 30 is inferior to the inorganic coating in terms of weather resistance, the organic clear coating layer 30 may deteriorate over time. If a new microcrack occurs in the inorganic clear coating film layer 24, the peeling prevention function by the organic clear coating film layer 30 may deteriorate. In such a case, the organic clear coating layer 30 may be formed once again at the stage where the caulking material 50 is repaired.
(C) The organic clear coating film layer 30 can also be formed at the time of manufacturing the exterior plate material 10. If the exterior plate material 10 is manufactured in a factory or the like and the high pigment sealer layer 22 and the inorganic clear coating layer 24 are applied and formed, the organic clear coating layer 30 is applied efficiently. The clear coating layer 30 can be formed. However, in this case, it is not expected that the organic clear paint penetrates into the microcracks generated in the inorganic clear coating layer 24 over time after the construction of the building.

A test was conducted to confirm that the above-described point-like peeling could be prevented by forming an organic clear coating layer.
[Exterior material]
What used the surface of the cement hardening board in which the inorganic clear coating film layer was formed with the solvent 2 liquid metal alkoxide 100% inorganic clear paint was used.
[Organic clear paint]
A two-solvent acrylic silicone clear paint was used. The main agent / curing agent was blended at 80/20 (weight ratio). A plurality of types having different dilution rates were used.

The surface of the inorganic coating layer of the exterior member was cleaned with a base treatment thinner to remove dirt, and then an organic clear paint was brushed along the outer periphery of the exterior member. The coating amount was about 60 to 70 g / m ² .
[Performance evaluation test]
<Appearance after painting>
The portion where the organic clear coating layer was formed was evaluated by visual comparison with the portion where the inorganic coating layer was exposed.
<Tape peeling test>
A cellophane tape forced peel test was performed according to a conventional method. The formed spot peel points were counted visually.

〔Test results〕

[Evaluation]
(1) From the results of the peel test, it can be seen that the number of spot peels can be greatly reduced by forming an organic clear coating layer. Even when the organic clear coating layer is formed, the point-like peeling is not lost, but this peeling test is because a much stronger adhesive tape than the masking tape is used. When a general masking tape is affixed, it can be presumed that the occurrence of dotted peeling can be sufficiently prevented by forming an organic clear coating layer.
(2) Changing the dilution ratio of the organic clear paint will change the appearance after painting. As the dilution rate is increased, the organic clear coating layer becomes less noticeable, but the number of spot-like peeling increases.

  Even when the dilution rate is relatively large, the point-like peeling does not increase so much, and it is understood that it is better to increase the dilution rate when appearance design is required.

  The present invention can be applied to, for example, repair work of a caulking material on the outer wall surface of a house. Even if a masking tape is used, the inorganic coating film layer formed on the surface of the exterior member is not peeled off. As a result, the protective function and appearance characteristics of the exterior member by the inorganic clear coating layer can be maintained well, and the quality performance of the house can be maintained, the durability can be improved, or the repair cost can be reduced.

Sectional drawing of the outer wall surface showing embodiment of this invention Front view of outer wall

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Exterior board material 12 Exterior base material 14 Joint gap 22 High pigment sealer layer 24 Inorganic clear coating layer 30 Organic clear coating layer 40 Masking tape 50 Caulking material

Claims (5)

In the outer wall surface of the building, the construction method of the caulking material that fills the joint gap provided at the side edge of the exterior member whose surface is coated with an inorganic coating layer,
A step (a) of forming an organic clear coating layer on the surface of the inorganic coating layer of the exterior member with a predetermined width along a side adjacent to the joint gap;
After the step (a), a step (b) of applying a masking tape along the side adjacent to the joint gap on the organic clear coating layer;
After the step (b), a step (c) of filling the joint gap with a caulking material;
After the said process (c), the construction method of the caulking material including the process (d) which peels off the said masking tape. The caulking material construction method according to claim 1, wherein the inorganic coating layer is a surface of the exterior member coated with an inorganic clear coating layer via a high pigment sealer layer. The organic clear coating layer is
An organic clear paint selected from the group consisting of acrylic silicon, acrylic urethane, and epoxy-modified acrylic is formed with a width of 20 to 40 mm and a dry thickness of 5 to 30 μm.
The method for applying a caulking material according to claim 1, wherein the peel strength is 10 to 50 N / cm ² . The caulking material construction method according to claim 1, wherein the exterior member is a ceramic siding board. An outer wall structure in which an exterior member is constructed on an outer wall surface of a building and a caulking material is buried in a joint gap provided at a side end of the exterior member,
An inorganic clear coating layer coated on the surface of the exterior member via a high pigment sealer layer;
An outer wall structure comprising: an organic clear coating layer formed with a predetermined width along a side of the exterior member adjacent to the joint gap on the surface of the inorganic clear coating layer.

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