JP4925617B2 - Sealing structure - Google Patents

Description

  The present invention relates to a sealing structure using a backup material or an anti-adhesive tape having air permeability.

Conventionally, the sealing material applied to joints such as the outer wall of a building is preliminarily adapted for construction with a two-component sealing material that is cured by mixing the main agent and the curing agent immediately before the construction and reacting both. There are moisture-curing type and dry-curing type one-component sealing materials that are adjusted to the state and cured from the surface in contact with air.
For example, working joints (joints that move due to temperature changes, earthquakes, etc.) used for outer walls such as curtain walls are used for movements (working joint movements described above) so as not to cause excessive deformation of the sealing material. On the other hand, it is common to have followability. For this reason, there is a method in which the bonding method of the sealing material is two-surface bonding in which only the both sides of the joint are bonded, and the surface on the joint bottom side is not bonded.
In this two-sided adhesion method, the joint base is treated to be non-adhered before the sealing material is applied, and the treatment method includes a method in which the joint base is not deep or deep, and a case in which the joint base is in a shallow position. There is a method.
If the joint bottom is not deep or deep, for example, a backup material made of a foamed material such as polyethylene or vinyl chloride resin is processed into the joint dimensions and loaded into the joint. The backup material has a function of adjusting the depth of the joint joint and setting the filling depth of the sealing material. On the other hand, when the joint base is shallow, for example, an anti-adhesion tape such as polyethylene tape or silicon tape is attached to the joint base. Note that both the backup material and the anti-adhesion tape are made of a material that is non-adhering to the sealing material.
Techniques for improving the function of the backup material as described above are disclosed in, for example, Patent Document 1 and Patent Document 2.
In Patent Document 1, the backup material has a hollow cylindrical shape, an air passage is secured in the hollow portion, and the hollow portion of the backup material is crushed when the joint receives a compressive force from both sides by the action of the movement. The deformation exerted on the sealing material is suppressed by the action of the pressure being released from the passage of the hollow portion.
Patent Document 2 is a sealing structure configured by inserting a back-up material made of a synthetic resin open cell body into a joint, and this back-up material has a function of guiding water. Then, when there is damage such as cracks in the sealing material, the water soaked from the sealing material is led to the inside of the backup material and drained.
JP 2003-171986 JP-A-6-346668

However, in patent document 1 and patent document 2, the joint bottom side of the sealing material cannot be in contact with air because it is disposed in contact with the backup material. Therefore, when a one-component sealant is used for the working joint, the sealant cures only from one surface that is in contact with the air, and it takes time to cure the sealant and the entire sealant is uniformly cured. In addition, there is a drawback that an uncured state in which a cured portion and a paste-like portion are mixed exists for several days or more.
Such a defect also applies to the case where a conventional anti-adhesive tape is applied to the joint base, and the joint base side of the sealing material is not in contact with air, resulting in a poorly cured state.
Further, when the movement acts during this curing period, there is a problem that the uncured layer is damaged and the quality is lowered. For this reason, the working joint has a problem that a one-component sealant cannot be used.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a sealing structure that improves the quality by shortening the curing time and reducing the damage of the sealing material during the curing.

In order to achieve the above object, in the sealing structure according to the present invention, in the sealing structure in which the joint material of the working joint used for the outer wall of the curtain wall is filled with the sealing material, a backup material made of an open-cell foam having air permeability is provided. The sealant is loaded into the joint so as to form a joint bottom that forms an interface with the sealant. The sealant is made of a one-component moisture-curing material, and moisture in the air is supplied through the continuous bubbles of the backup material. Further, the present invention is characterized in that it is configured to increase the deformation follow-up property with respect to the movement received during curing by increasing the curing time.
The one-component sealant is preferably a polyurethane material.
In the present invention, the sealing material can be cured from both the surface side and the boundary surface side with the backup material by loading a backup material having air permeability on the joint bottom side of the sealing material. For this reason, compared with the conventional sealing structure which hardens | cure only from the surface side, while being able to shorten hardening time, it can be set as a uniform hardening state. Furthermore, since the time during which the uncured portion where the sealing material is likely to be damaged exists can be shortened, for example, the deformation followability is increased with respect to the movement received during curing, and the damage to the sealing material can be reduced.

In the sealing structure according to the present invention, it is preferable that the backup material is compressed in the width direction of the joint and loaded in the joint.
In the present invention, since the backup material is loaded in the joint in a state compressed in the width direction of the joint, the backup material can follow this movement when the joint is opened and closed. Therefore, the stress that causes deformation on the sealing material is not concentrated, so that damage can be reduced.

In the sealing structure according to the present invention, it is preferable that the backup material is formed so as to increase the thickness of the sealing material at the boundary surface where the both side surfaces of the joint and the sealing material are bonded.
In the present invention, since the backup material has a structure in which the sealing material is reinforced at the boundary surface where the movement stress acts greatly, damage to the sealing material can be reduced.

In the sealing structure according to the present invention, it is preferable that the backup material is in contact with the sealing material.
In the present invention, the sealing material can be cured from the surface in contact with the backup material and can be cured at the same speed as the surface side facing the air, so that a uniform cured state can be realized.

  According to the sealing structure of the present invention, since the sealing material can be cured from both the front surface side and the joint bottom side, the curing time can be shortened and a uniform cured state can be obtained. Furthermore, since the time during which there is an uncured portion where the sealing material is likely to be damaged can be shortened, deformation followability is enhanced with respect to the movement during curing, and damage to the sealing material can be reduced. For this reason, the quality of the sealing material can be improved. Therefore, the sealing structure configured as described above can be provided at the joint forming the working joint.

Hereinafter, a first embodiment of a sealing structure according to the present invention will be described with reference to FIGS.
FIG. 1 is a view showing a sealing structure according to the first embodiment, and FIG. 2 is a view showing a test result of a sealing material by a deformation repetition test.

  As shown in FIG. 1, the present sealing structure 1 is constructed on a joint 3 on an outer wall 2 of a building. In the first embodiment, for example, a temperature change or an earthquake occurs on the outer wall 2 such as a curtain wall. The joint 3 is applied to a so-called working joint that opens and closes. In addition, the joint 3 which makes the connection part of the outer walls 2 and 2 may be a joint with no joint bottom or a deep joint.

As shown in FIG. 1, the schematic structure of the sealing structure 1 is loaded so as to provide a joint bottom side interface 4a (joint base) forming a joint base at a predetermined depth D2, and has a breathability such as polyurethane. It consists of a breathable backup material 4 made of an open-cell foam and a sealing material 5 filled in a joint-free interface 4a of the breathable backup material 4 in an unbonded state. Here, the air-permeable backup material 4 is loaded in such a direction that the air-permeable surface contacts the joint bottom side interface 5 b of the sealing material 5. In addition, this sealing material 5 is a moisture hardening type, and uses the 1 component type sealing material 5 which hardens | cures from the surface which is in contact with air.
The breathable backup material 4 is formed in advance so as to be loaded on the joint 3 in a compressed state of, for example, about 10 to 30% with respect to the joint width D1. The breathable backup material 4 is a material that is non-adherent to the sealing material 5.

Next, the operation and sealing method of the sealing structure 1 having such a configuration will be described.
As shown in FIG. 1, the construction procedure of the sealing structure 1 is as follows. First, in the joint 3 of the working joint, the breathable backup material 4 is jointed so that the joint bottom side interface 4a forming the joint bottom is located at a predetermined position. It is compressed and inserted in the direction of the width D1, and is brought into close contact with both side surfaces 3a of the joint 3.
Next, the sealing material 5 is filled in the gap from the joint bottom side interface 4 a to the surface substantially the same as the surface 2 a of the outer wall 2. The cured sealing material 5 is bonded to the side surface 3a of the joint 3, and the joint bottom side interface 4a of the breathable backup material 4 and the sealing material 5 are in a non-adhered state, and therefore, the two surfaces are bonded.

  Here, since the sealing material 5 is a one-component type, curing starts from a surface in contact with air in a rubbery form. Since the air-permeable backup material 4 is air-permeable, the filled sealing material 5 is cured from the surface 5a, and moisture (humidity) in the air is supplied to the joint base side interface 5b through the continuous bubbles of the backup material 4. As a result, curing begins at substantially the same speed as the surface 5a. And the sealing material 5 which hardens | cures from both surfaces 5a and 5b can be hardened | cured in the state with which the uncured state part did not vary and was filled uniformly.

  Further, as shown in FIG. 1, when the breathable backup material 4 is loaded in the joint 3 in a compressed state, when the joint 3 is opened and closed by a movement action, the breathable backup material 4 is protected against this movement. Can be followed. Accordingly, the stress that causes deformation on the sealing material 5 is not concentrated, so that damage can be reduced.

(Test example)
Next, the test which confirmed the hardening state of the sealing material 5 by the air permeable backup material 4 which has the air permeability mentioned above is demonstrated based on FIG.
The test results shown in FIG. 2 indicate that a certain movement is forced to act on the sealing material 5 in the curing process filled in the joint 3 formed by combining two mortars each having a side of 50 mm square, which is not the embodiment, It is an example which shows the result of the deformation | transformation repetition test which confirmed the damage degree (refer FIG. 1).

And in this test, the test by the Example using the breathable backup material 4 (The product made by Sangopan, thermal bond V-2100, width (thickness) 12.7 mm) which consists of an open-cell foam of a polyurethane resin, and a polyethylene resin And a test according to a comparative example using a backup material (non-breathable or non-breathable) backup material (made by Koei Processing Co., Ltd., pack backer, width 12 mm) made of a closed cell foam.
As shown in FIG. 2, the test body of the sealing material 5 is formed in a longitudinal section A (joint width D1 × depth D2) having a square of 12 mm on one side (see FIG. 1).
In this test, a one-component moisture-curing silicone sealant 5 (Shin-Etsu Chemical Co., Ltd., sealant 45) was used in the first test, and a one-component moisture-curing polyurethane was used in the second test. System sealant 5 (manufactured by Auto Chemical Industry Co., Ltd., ALC coke) is used. In each of the first test and the second test, the example using the breathable backup material 4 and the comparative example using the non-breathable backup material are tested. Here, let each test body of the sealing material 5 be 1st test body S1, 2nd test body S2, 3rd test body P1, and 4th test body P2 (refer FIG. 2). Before filling the sealant 5, both sides of the joint are made of primer MT (manufactured by Shin-Etsu Chemical Co., Ltd.) in the case of the silicon sealant 5 and primer OP-2531 (in the case of the polyurethane sealant 5). The primer application treatment was carried out by Auto Chemical Industry Co., Ltd.
And each test body S1, S2, P1, P2 shown in FIG. 2 shows the state of the sealing material 5 after the test. The upper surface of each test body is in contact with the air, and the lower surface is in contact with the backup material (FIG. 1). The joint bottom side interface 5b) shown in FIG.
As a test method, a fatigue testing machine (not shown) that generates a movement is used so that the test specimen is repeatedly applied at a cycle of once per day equivalent to a cycle of movement that can occur in a normal building. In this deformation repetition test, a total of three times (three days) of movement is applied to each of the specimens S1, S2, P1, and P2 in the process from immediately after the sealing material 5 is applied until it hardens. The deformation amount of 3 is set to ± 10% with respect to the joint width D1 shown in FIG.

Next, test results obtained by performing the deformation repetition test for each of the above-described test bodies will be described.
As shown in FIG. 2, in the second and fourth test bodies S <b> 2 and P <b> 2 in the comparative example using the non-breathable backup material, the crack-like damaged portion from the joint bottom side interface 5 b (see FIG. 1) of the sealing material 5. K has occurred. On the other hand, in the first and third test bodies S1 and P1 in the example using the breathable backup material 4, the joint bottom side interface 5b is hardly damaged, and the filling state of the sealing material 5 is uniform. It can be confirmed that it is cured.
Therefore, in the case of the comparative example, it can be said that the damaged portion K occurred because the joint bottom side interface 5b of the sealing material 5 did not come into contact with the air and the curing failure occurred.
On the other hand, in the case of the breathable backup material 4, it can be said from the test results in which the sealing material 6 was not damaged that the joint bottom side interface 5 b is in contact with air, thereby promoting the curing.

In the sealing structure 1 using the breathable backup material 4 according to the present embodiment, since it can be cured from both the surface 5a and the joint bottom side interface 5b of the one-component type sealing material 5, it is like a conventional sealing structure. Compared with the case where it hardens | cures only from the surface 5a side, the hardening time of the sealing material 5 can be advanced, and it can be made into a uniform hardening state. Furthermore, since the time during which the uncured portion where the sealing material 5 is likely to be damaged can be shortened, the flexibility of the backup material is increased (softened), and the deformation of the sealing material is not restricted. For example, the deformation followability increases with respect to the movement received during curing. Thereby, since the damage of the sealing material 5 can be decreased, the quality of the sealing material 5 can be improved.
And the sealing structure 1 comprised in this way can be provided in the joint 3 which makes a working joint.

Next, a modified example of the first embodiment will be described with reference to FIGS. 3 and 4, and the same reference numerals are used for members and parts that are the same as or similar to those of the first embodiment described above. A description is omitted, and a configuration different from the first embodiment will be described.
FIG. 3 is a diagram of a sealing structure showing a modification according to the first embodiment.
In this modification, as shown in FIG. 3, the breathable backup material 4 has chamfered portions 4b chamfered at both ends of the joint bottom side interface 4a, and both sides of the joint 3 to which the sealing material 5 is bonded. It is formed so as to increase the thickness at the side interface 5c (boundary surface) where the surfaces 3a, 3a and the sealing material 5 are bonded.
The location where the chamfered portion 4b is formed is a location where the stress of the movement acts greatly, but by forming the chamfered portion 4b on the breathable backup material 4, the side interface 5c of the sealing material 5 is reinforced. It becomes a structure. Therefore, damage to the sealing material 5 can be reduced.

Next, a reference example according to the present invention will be described with reference to FIG.
FIG. 4 is a view showing a sealing structure according to a reference example .
As shown in FIG. 4, the sealing structure 6 according to this reference example is formed on the joint 3 having the joint bottom 7 at the connecting portion between the outer walls 2 and 2. This sealing structure 6 is bonded to the boundary surface 8a between the anti-adhesion tape 8 (adhesion prevention member) that is bonded to the joint base 7 and is formed in a belt-like shape made of a breathable fluorine film, and non-adhesive. It is comprised from the sealing material 5 filled so that it might become this state.
The sealing structure 6 according to the above-described reference example has the same operation and effect as the sealing structure 1 (see FIG. 1) shown in the first embodiment. When the sealing material 5 is cured, the surface 5a and the joint bottom side are provided. Since both surfaces of the interface 5b are in contact with air, the curing time can be shortened, damage to the sealing material 5 can be reduced, and the quality can be improved.

The first embodiment of the sealing structure according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.
For example, in the first embodiment , the sealing structure 1 is applied to a working joint in which the joint 3 opens and closes. However, the sealing structure 1 may be applied to a non-working joint that has no or little movement due to a temperature change or an earthquake. It doesn't matter.
In addition, the test body used in the deformation repetition test described in the first embodiment is two types of sealing materials 5 of silicon and polyurethane, but shows an example of the test, It is not limited to these two kinds of sealing materials 5.
Furthermore, in this 1st Embodiment, although compression of the air permeable backup material 4 is 10 to 30% with respect to the joint width D1, it is not necessarily limited to this compression rate.

The backup material used in the present invention is made of a synthetic resin, a synthetic rubber or the like in which a large number of bubbles are formed using a foaming agent or the like. These bubbles are continuous open cells and need to have air permeability, and various shapes such as a tape shape, a flat plate shape, a round bar shape, a square bar shape, and a string shape can be mentioned. The synthetic resin may be either thermosetting or thermoplastic, and examples thereof include polyurethane resin, polyethylene resin, polypropylene resin, fluororesin, polyester resin, acrylic resin, vinyl chloride resin, phenol resin, and the like. Examples thereof include various types such as EPDM rubber, butyl rubber, chloroprene rubber, SBR, NBR, and silicon rubber.
As described above, the surface in contact with the sealant 5 of the backup material is preferably a sealing material 5 has a property that does not adhere. With respect to this non-adhesive property, the material itself may be non-adhesive, or the surface in contact with the sealing material 5 may be subjected to a release treatment with a silicon release agent or the like.
Moreover, as the sealing material 5 used in the present invention, as described above, the one-component sealing material that cures from the surface in contact with air, particularly the one-component material that cures from the surface in contact with moisture (humidity) in the air. The moisture-curing type sealing material does not have the trouble of mixing the main agent and the curing agent, and further exhibits the good workability without the problem of curing failure due to poor mixing and the effect of the sealing structure 1 of the present invention can be maximized. This is preferable .
Suitable examples of the one-component sealing material include, in addition to the above-mentioned polyurethane-based and silicon-based sealing materials, modified silicon-based and polysulfide-based sealing materials.

It is a figure which shows the sealing structure by the 1st Embodiment of this invention. It is a figure which shows the test result of the sealing material by a deformation | transformation repetition test. It is a figure of the sealing structure which shows the modification by this 1st Embodiment. It is a figure which shows the sealing structure by a reference example .

Explanation of symbols

1, 6 Sealing structure 2 Outer wall 3 Joint 4 Breathable backup material (backup material)
4a Joint base side interface (joint base)
5 Sealing material 5c Lateral interface (boundary surface)
7 Joint base 8 Adhesion prevention tape (adhesion prevention member)
8a interface

Claims (5)

In the sealing structure that fills the joint of the working joint used for the outer wall of the curtain wall with the sealing material,
A backup material made of an open-cell foam having air permeability is loaded on the joint so as to form a joint bottom that forms an interface with the sealing material,
The sealing material is made of a one-component moisture-curing material, and is supplied with moisture in the air through the continuous bubbles of the backup material, thereby increasing the deformation followability with respect to the movement received during curing by shortening the curing time. A sealing structure characterized by being configured as described above.   The sealing structure according to claim 1, wherein the backup material is compressed in the width direction of the joint and loaded into the joint.   The said backup material is formed so that the thickness of the said sealing material may be increased at the boundary surface where the both sides of the said joint and the said sealing material adhere | attach. Sealing structure.   The sealing structure according to claim 1, wherein the backup material is in contact with the sealing material. The sealing structure according to any one of claims 1 to 4, wherein the one-component sealing material is a polyurethane-based material.

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