JP3375592B2 - Seamless joint structure of outer wall and elastic joint treatment material used for it - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jointless structure for an outer wall, in which a portion where the outer wall material of a building is joined is jointless, and an elastic joint treatment material used therefor.

[0002]

2. Description of the Related Art Conventionally, as a jointless structure of an outer wall in which a portion where the outer wall material of a building is joined is made into a jointless state, for example, there is a jointless structure of an outer wall disclosed in Utility Model Registration No. 2592501. In the conventional jointless structure described above, an elastic joint treatment material is spread on the front side surface of the joint portion of the outer wall material, and a mesh made of a fiber having a mesh is arranged thereon, and the elastic joint treatment material is placed thereon. And then coated with an elastic coating material.
When the outer wall material expands and contracts in a direction perpendicular to the butting portion, the mesh body absorbs and relaxes the expansion and contraction by the bias effect based on the mesh.

[0003]

[Problems to be Solved] However, in the above-mentioned conventional jointless structure, since the elastic joint treatment material is insufficient in performance, the joint thinning occurs largely, and the joint thinning treatment is performed twice. It takes a long time to work under high temperature and high humidity, such as during the rainy season or in the summer. It takes a long time to work in the low temperature such as the winter. Poor adhesion or contamination of the top coating material may occur. There is a problem that the outer wall may be damaged.

Conventionally, as the above-mentioned elastic joint treatment material, epoxy-based, acrylic-based, urethane-based, and modified silicone-based materials have been generally used. First, the elastic joint treatment material containing a large amount of an organic solvent has a large amount of thinning,
It took a lot of time and labor because repair work was required to replenish the elastic joint treatment material again after allowing a few days for the meat to become lean and stable after the first joint treatment. Furthermore, if the repair work is started because the organic solvent component in the elastic joint treatment material has not completely evaporated, it will lead to a large joint thinning after painting.

The acrylic-based, urethane-based, and modified silicone-based one-component curing type elastic joint treatment material has a curing mechanism in which the curing rate is highly dependent on temperature and humidity. Therefore, if the elastic joint treatment material is designed with an emphasis on the curing rate at low temperatures such as in winter, the curing rate will be too fast and the working time will not be sufficiently secured under high temperature and high humidity such as during the rainy season and summer. With the drawback. On the other hand, if the elastic joint treatment material is designed with an emphasis on the working time under high temperature and high humidity, it has a drawback that the curing speed becomes slow at low temperatures such as in winter and the construction period becomes long.

In the case of the modified silicone type, the effect catalyst is easily deactivated at low temperature and high humidity, and when the film thickness is small,
It has the drawback of not hardening over a long period of time. Therefore, when the joint treatment material is spread thinly and used, curing may not proceed and the construction period may be prolonged.

Epoxy type and acrylic type are
Originally, it is a low-elasticity material and cannot follow the movement of outer wall plates such as siding boards, which may cause joint cracking. In particular, epoxy type not only causes joint cracks,
Problems such as destruction of the outer wall material may occur.

Further, in the high elastic material, the modified silicone type material may cause poor adhesion or contamination of the coating material to be coated thereon. In addition, since urethane-based compounds whose curing mechanism is a urea bond reaction between isocyanate groups or a urethane bond reaction between isocyanate groups / hydroxyl groups are generally composed of aromatic isocyanate resin with low weather resistance as a main component, There is a possibility that problems similar to those of epoxy type may occur because of the large change over time accompanying the rise.

The present invention has been made in view of the above-mentioned conventional problems, and has a small joint thinness, the joint can be hidden by one joint processing work, and a working time under high temperature and high humidity such as rainy season or summer. Can be taken sufficiently, the construction period is short at low temperatures such as in winter, and poor adhesion and contamination of the top coating material are unlikely to occur.
It is intended to provide a jointless structure of an outer wall that does not cause joint cracking or damage to the outer wall over time, and an elastic joint treatment material used for the jointless structure.

[0010]

According to a first aspect of the present invention, a plurality of outer wall members are attached to a base material by abutting their side end portions with each other, and a table of the abutting portions of the side end portions is provided. The side surface is covered with an elastic joint treatment material, and a mesh body through which the elastic joint treatment material penetrates is arranged inside the elastic joint treatment material, and the surface of the elastic joint treatment material layer is elastically coated. In the jointless structure of the outer wall covering the material, the elastic joint treatment material has an organic solvent content of less than 5% by weight, and
Urethane prepolymer containing 2 or more isocyanate groups per molecule obtained by reacting an aliphatic diisocyanate compound and / or alicyclic diisocyanate compound with an active hydrogen-containing compound, and 2 per molecule by hydrolysis A one-component curable elastic composition comprising the above-mentioned compound that produces a thiol group, which cures when the isocyanate group and the thiol group react to form a thiourethane bond. It is in a jointless structure on the outer wall.

What is most noticeable in the present invention is that the elastic joint treatment material has an organic solvent content of less than 5% by weight and contains an aliphatic diisocyanate compound and / or an alicyclic diisocyanate compound and active hydrogen. A urethane prepolymer containing two or more isocyanate groups per molecule obtained by reacting with a compound containing a compound, and a compound that produces two or more thiol groups per molecule by hydrolysis. And the thiol group reacts with each other to form a thiourethane bond, which cures by using a one-component curable elastic composition as an elastic joint treatment material.

In the present invention, examples of the outer wall material include ceramic building boards, ALC boards, and asbestos slate boards. The structure of the side edge of the outer wall material includes flat, butted, beveled butted, and abutting (FIGS. 2 to 5).
The mesh body has a space portion (mesh portion) so that the elastic joint treatment material can penetrate from the upper surface to the lower surface.

Examples of such a mesh-like body include a net made of an inorganic material or an organic material, a woven fabric, and a knitted fabric.
It is preferable to use a stretchable material. In addition, examples of the material include polyester, nylon, tetron, and natural fiber.

The organic solvent content of the elastic joint treatment material is
It is less than 5% by weight, more preferably less than 3% by weight. When the content of the organic solvent is 5% by weight or more, the volume shrinkage of the elastic joint treatment material increases, resulting in a large joint thinning. Most preferably, the organic solvent content is zero.

A compound which produces two or more thiol groups per molecule by hydrolysis is one having a silylthio group at the terminal. Preferred examples of such a compound are described in JP-A-63-145321. Have been described. Specific examples of such compounds include a molecular weight of 800
~ 5000, content of trimethylsilylthio group 3-20
A polysulfide polymer having a weight% and a viscosity of 5 to 500 poise may be mentioned.

The thiourethane bond --NHCOS-- is
The isocyanate group-NCO and the thiol group-S
It is formed by the reaction of H. By this reaction,
The one-component curable elastic composition is cured.

For the above reaction, a urethane prepolymer containing two isocyanate groups per molecule,
The reaction formula with a compound that produces two thiol groups by hydrolysis is as follows. _{XS-R'-SX + H 2} O → HS-R'-SX + X
OH OCN-R-NCO + HS-R'-SX → OCN-
R-NHCOS-R'-SX

In the above, XS-R'-SX is a compound which, when reacted with water (H ₂ O), produces two thiol groups -SH by hydrolysis. X represents a hydrolyzable group. OCN-R-NCO is a urethane prepolymer, and OCN-R-NHCOS-
R'-SX is in a state where curing has progressed due to the thiourethane bond.

A urethane containing two or more isocyanate groups per molecule obtained by reacting the above-mentioned aliphatic diisocyanate compound and / or alicyclic diisocyanate compound in the above-mentioned elastic joint treatment material with an active hydrogen-containing compound. The compounding ratio of the prepolymer and the compound that produces two or more thiol groups per molecule by the above hydrolysis is such that the molar ratio of the thiol groups produced by the latter hydrolysis to the number of moles of the former isocyanate group is 0.5 to
It is preferably between 1.2. When the molar ratio of the thiol group formed by the latter hydrolysis to the number of moles of the former isocyanate group is less than 0.5 or exceeds 1.2,
There is a risk that curing will not proceed sufficiently and that various performances such as elongation and adhesiveness may deteriorate.

The above-mentioned elastic joint treatment material is used for the purpose of further improving the economical efficiency, workability during construction, and physical properties after curing.
Fillers such as calcium carbonate, talc, clay, titanium oxide and silica, and liquid softeners such as dioctyl phthalate, dioctyl adipate and polymer softener can be added in appropriate amounts. In addition, various amines such as triethylamine can be added as a reaction catalyst in an appropriate amount for the purpose of quick and reliable curing after construction.

In the non-joint structure of the outer wall, as described above, the surface side of the abutting portion is covered with the elastic joint treatment agent and the net body, and then the entire outer wall surface is covered with the elastic coating material. As an example of the elastic coating material, acrylic type and silicone acrylic type are preferable.

Next, the function and effect of the present invention will be described.
Since the elastic joint treatment material has an organic solvent content of less than 5% by weight, the joint treatment material is less likely to be thinned due to the thinness of the joint treatment material, and the joint can be hidden by one joint treatment work.

When the elastic joint treatment material is of the thiourethane bond reaction type, the temperature and humidity dependency of the curing rate can be reduced. Therefore, the elastic joint treatment material can be easily controlled such that the curing time under high temperature and high humidity such as in the rainy season or summer can be extended, and the curing time under low temperature such as winter can be shortened.

Since the elastic joint treatment material is composed of the urethane prepolymer and a compound which produces two or more thiol groups per molecule by hydrolysis, it has good adhesion to the overcoat material and is unlikely to cause contamination. .

The above-mentioned one-component curable elastic composition is obtained by reacting an aliphatic diisocyanate compound having good weather resistance and / or an alicyclic diisocyanate compound having also good weather resistance with an active hydrogen-containing compound. The main component is a urethane prepolymer containing two or more isocyanate groups. Therefore, the physical properties are stable for a long period of time, and joint cracks and outer wall damage do not occur over the years.

As described above, according to the present invention, the joint thinness is small, the joint can be hidden by one joint processing work, the working time can be sufficiently taken in high temperature and high humidity such as rainy season and summer, winter, etc. It is possible to provide a jointless structure of the outer wall, which has a short construction period at low temperature, is less likely to cause poor adhesion and contamination of the top coating material, and does not suffer from joint cracking or outer wall damage over the years.

Next, as the urethane prepolymer having two or more isocyanate groups per molecule, which is obtained by reacting the above aliphatic diisocyanate compound and / or alicyclic diisocyanate compound with an active hydrogen-containing compound, As in the invention described in claim 2, it is preferable to use polyether polyol and / or polyester polyol as the active hydrogen-containing compound.

Specific examples of urethane prepolymers obtained by reacting these polyols with a diisocyanate compound are polypropylene glycols having a molecular weight of 1000 to 6000 in consideration of various physical properties such as workability, adhesiveness, curability and weather resistance. A urethane polymer having an isocyanate content of 1.0 to 7% by weight and a viscosity of 50 to 250 poise, which is obtained by reacting the terminal hydroxyl group with hexamethylene diisocyanate, is preferable. Also, the molecular weight of 1000
Isocyanate content of 1.5 to 7% by weight, viscosity of 50 to 25, obtained by reacting 6000 terminal hydroxyl groups of polypropylene glycol with isophorone diisocyanate.
A 0 poise urethane polymer is preferred.

Next, according to the invention of claim 3, the aliphatic diisocyanate compound and / or the alicyclic diisocyanate compound is hexamethylene diisocyanate,
1 selected from isophorone diisocyanate, 1,3-bis (isocyanatomethyl) -cyclohexane, 4,4'-methylenebis (cyclohexyl diisocyanate)
It is preferable that the diisocyanate compound is one or more kinds. Since this compound is a high weather resistance diisocyanate compound, it has excellent stability of performance over a long period of time.
This makes it possible to easily obtain a durable jointless structure of the outer wall.

Next, as described in claim 4, the urethane prepolymer containing two or more isocyanate groups per molecule is obtained by reacting a terminal hydroxyl group of polypropylene glycol with hexamethylene diisocyanate. It is preferably a liquid compound that can be used. This compound is excellent in various properties such as weather resistance, reactivity, elongation, adhesiveness and workability. Therefore, it is possible to easily obtain a durable jointless structure of the outer wall.

Next, as in the invention described in claim 5, the urethane prepolymer containing two or more isocyanate groups per molecule is a liquid compound obtained by reacting polypropylene glycol with isophorone diisocyanate. It is preferable. This compound is excellent in various properties such as weather resistance, reactivity, elongation, adhesiveness and workability.
Therefore, it is possible to easily obtain a durable jointless structure of the outer wall.

Next, as in the sixth aspect of the present invention, the compound that produces two or more thiol groups per molecule by the above hydrolysis is preferably a trimethylsilylthio group-terminated polysulfide polymer. This compound is excellent in various properties such as weather resistance, reactivity, elongation, adhesiveness and workability. Therefore, it is possible to easily obtain a durable jointless structure of the outer wall.

Next, as in the invention described in claim 7, it is preferable that the outer wall material is a ceramic building board. As a result, since the outer wall material is excellent in dimensional stability, workability, paintability, etc., it is possible to easily obtain a jointless structure of the outer wall having an excellent appearance.

Next, as in the eighth aspect of the present invention, a plurality of outer wall materials are attached to the base material with their side ends abutted against each other, and an elastic coating material is applied to the surface of the outer wall material. An elastic joint treatment material for covering the front side surface of the abutting portion of the outer wall material side end in the jointless structure of the outer wall formed by coating,
The elastic joint treatment material has an organic solvent content of less than 5% by weight, and has an aliphatic diisocyanate compound and / or
Alternatively, a urethane prepolymer containing two or more isocyanate groups per molecule obtained by reacting an alicyclic diisocyanate compound with an active hydrogen-containing compound and two or more thiol groups per molecule by hydrolysis. And a thiol group that reacts with the above isocyanate group to form a thiourethane bond, which cures to form a one-component curable elastic composition.

As a result, the joint thinness is small, the joint can be hidden by one joint treatment, the working time can be sufficiently taken in high temperature and high humidity such as rainy season and summer, and the construction period is short in low temperature such as winter. Thus, it is possible to provide a non-joint treatment material for the outer wall, which is unlikely to cause poor adhesion or contamination of the top coating material and which does not cause joint cracking or outer wall damage over the years.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 Regarding a jointless structure of an outer wall according to an embodiment of the present invention,
This will be described with reference to FIG. In the jointless structure of the outer wall of this example, as shown in FIGS. 1 (A) and 1 (B), two outer wall materials 1 made of ceramic-based building board are abutted at their side end portions 3 to each other. It is attached to the base material with fasteners such as metal fittings, nails, and screws. The front side surface 11 of the abutting portion 2 of the side end portion 3 is covered with an elastic joint treatment material 6. Further, a mesh body 7 through which the elastic joint treatment material 6 can penetrate is arranged inside the elastic joint treatment material 6. An elastic coating material 18 is applied to the surface of the elastic joint treatment material 6.

Such a construction is carried out, for example, on the front side 1 described above.
First, the elastic joint treatment material 6 is spread on a thin film with a spatula or the like, a mesh body 7 made of a woven fabric is placed thereon, and the elastic joint treatment material 6 having a total thickness of 1 to 1 is again placed thereon. Cover 2 mm. At this time, the upper and lower elastic joint treatment materials 6 of the mesh body 7 are joined to each other through the gap of the mesh body 7. Then, after the elastic joint treatment material 6 is cured, the elastic coating material 18 is applied.

The elastic joint treatment material 6 has a content of the organic solvent of less than 5% by weight, and the aliphatic diisocyanate compound and / or the alicyclic diisocyanate compound is reacted with the active hydrogen-containing compound. Comprising a urethane prepolymer containing two or more isocyanate groups per molecule obtained by the above, and a compound which produces two or more thiol groups per molecule by hydrolysis, and the above-mentioned isocyanate group and the above-mentioned thiol group react with each other. It is a one-component curable elastic composition that is cured by forming a thiourethane bond. See the experimental examples for specific examples.

According to the present example, joint thinness is small, the joint can be hidden by one joint processing work, sufficient working time can be taken under high temperature and high humidity such as rainy season and summer, and in low temperature such as winter. (EN) It is possible to provide a jointless structure of an outer wall, which has a short construction period, is less likely to cause poor adhesion and contamination of the overcoat material, does not cause joint cracking or damage to the outer wall over time, and an elastic joint treatment material used therefor.

Embodiment 2 In this embodiment, as shown in FIGS. 2 to 5, the side end portion 3 of the outer wall member 1 is
This is an example of the jointless structure of the outer wall in which the shape and the structure for associating are various shapes and structures. 2 to 5, since the outer wall material 1 has a structure of left and right mirror objects,
One outer wall material will be mainly described. In addition,
In FIG. 5, the elastic joint treatment material, the mesh body, etc. are omitted. That is, in the jointless structure shown in FIG. 2 (A), the side end portion 3 of the outer wall material 1 has an end face 31 formed in a plane substantially perpendicular to the front side face 11, and the end faces 31 are joined to each other. The structure is such that they are brought into contact with each other and abutted against each other.

Further, as a variation thereof, FIG.
As shown in (B), there is a shape of the side end portion 3 of the outer wall material 1 in which a chamfered portion 32 is formed at a corner portion between the end surface 31 and the front side surface 11. Then, by abutting the side end portions 3, the groove portion 51 having a V-shaped cross section is formed.

Further, as shown in FIG. 2 (C), the side edge portion 3 of the outer wall member 1 may be formed so that the inclination angle of the chamfered portion 32 with respect to the front side surface 11 is small.
In this case, a shallow and wide V-shaped groove 52 is formed when the side ends 3 are butted.

Further, as shown in FIG. 2D, the side end 3 of the outer wall material 1 may be formed by forming a notch step portion 33 at a corner between the end surface 31 and the front side surface 11. it can. In this case, when the side end portions 3 are butted, the groove portion 5 having the bottom portion 531 parallel to the front side surface 11 of the outer wall material 1 is formed.
3 is formed.

Next, in the jointless structure shown in FIG. 3 (A), the side end portion 3 of the outer wall member 1 has an end face 31 formed in a plane forming an acute angle with respect to the front side surface 11, The structure is such that the corners between the end surface 31 and the front side surface 11 are brought into contact with each other and abutted against each other. In this case,
As shown in (A), an inverted V-shaped slit 311 is formed in the abutting portion 2 by the end faces 31 of the two outer wall members 1.

Further, as a variation thereof, FIG.
There is a shape and an abutting structure of the end portion 3 shown in (B), (C) and (D). For the shapes and structures of these, see Fig. 3.
The shape and abutting structure of the outer wall material shown in FIG.
This is a combination of the shape and the abutting structure of the outer wall member 1 shown in (B), (C) and (D).

Next, in the jointless structure shown in FIG. 4 (A), the side end portion 3 of the outer wall member 1 has a phased shape. That is, the male end portion 35 is formed on the side end portion 3 of one outer wall member 1, and the female end portion 34 is formed on the side end portion 3 of the other outer wall member 1. The male portion 35 is formed to be slightly longer than the depth of the female portion 34. And
When the side end portions 3 of the outer wall member 1 are butted, the front end surface 351 of the male solid portion 35 is brought into contact with the notched vertical surface 342 of the female solid portion 34. At this time, a gap 121 is formed in the abutting portion 2 on the back side surface 12 of the outer wall material 1.

Further, as a variation thereof, FIG.
There is a shape and an abutting structure of the end portion 3 shown in (B), (C) and (D). Figure 4 shows the shapes and structures of these.
The shape and abutting structure of the outer wall material 1 shown in (A) and the shape and abutting structure of the outer wall material 1 shown in FIGS. 2 (B), (C) and (D) are combined.

Next, also in the jointless structure shown in FIG. 5A, the side end portion 3 of the outer wall member 1 has a fitting shape, as in the jointless structure shown in FIG. 4A. The butting structure shown in FIG. 5 (A) differs from the butting structure shown in FIG. 4 (A) in that the male part 35 is formed to be slightly shorter than the depth of the female part 34. Then, when the side end portions 3 of the outer wall member 1 are butted, the tip end surface 341 of the female real portion 34 is brought into contact with the notched vertical surface 332 of the male real portion 33. At this time, a gap 111 is formed in the abutting portion 2 on the front side surface 11 of the outer wall material 1.

Further, as a variation thereof, FIG.
There is a shape and an abutting structure of the end portion 3 shown in (B), (C) and (D). Figure 5 shows the shapes and structures of these.
This is a combination of the shape and abutting structure of the outer wall material 1 shown in (A) and the shape and abutting structure of the outer wall material shown in FIGS. 2 (B), (C) and (D).

The jointless structure of the outer wall material of this example is the same as that of the first embodiment except for the above-mentioned butt structure. That is, in the above-mentioned butt structure, the outer surface of the butt portion of the outer wall material is covered with an elastic joint treatment material or the like to have the same configuration as that of the first embodiment. Also in the case of this example, the same operational effects as those of the first embodiment are obtained.

Experimental Example In this example, the performance of the elastic joint treatment material used for the jointless structure of the outer wall material of the present invention was evaluated. First, each raw material is used as an elastic joint treatment material used in the jointless structure of the present invention.
Alternatively, two types of elastic joint treatment materials (Sample 1 and Sample 2) were prepared by mixing at the mixing ratios shown in Table 2. A polymer soft material was used as the soft material, and an amine compound was used as the catalyst.

[0052]

[Table 1]

[0053]

[Table 2]

For comparison, a commercially available epoxy putty material as Comparative Sample 1, a commercially available acrylic putty material as Comparative Sample 2, a commercially available urethane putty material as Comparative Sample 3, and a commercially available urethane sealing material as Comparative Sample 4. , Commercially available modified silicone putty material as comparative sample 5, comparative sample 6
A commercially available modified silicone sealing material was prepared as.

The various performances of each of the above samples (elastic joint treatment material) were evaluated by the following methods. <1> Evaluation of Adhesiveness (Elongation) Using each of the above-mentioned samples, a test piece having a jointless structure having the structure shown in Embodiment 1 was prepared (see FIG. 1). That is, the test body was cured for 4 days at 23 ° C. and further for 3 days at 30 ° C., and then cured for 14 days while being immersed in water at 23 ° C. After performing the above-mentioned curing,
A tensile test was conducted at a tensile rate of 5 mm / min at a temperature of ℃. The pulling direction is the direction of arrow A shown in FIG. 1, and is the direction of pulling apart the abutting portions. At this time, the amount of elongation at the time when peeling of the joint treatment material, cutting of the joint treatment material, or destruction of the outer wall material occurred was measured. The greater the amount of elongation, the better the followability to the movement of the outer wall material.

<2> Evaluation of thinning resistance of each of the above samples, the weight change rate was measured based on the heat loss test of JIS A1439. The smaller the weight change rate, the better the resistance to thinning of the meat.

<3> Evaluation of stability of physical properties A test body 8 shown in FIG. 6 was prepared using each of the above samples.
The test body 8 consists of two aluminum adhered plates 82 facing each other.
Each of the above-mentioned samples is applied in the shape of a square pole 81 between the two. The size of the square pole is 12mm × 12mm × 50m
m.

The test body 8 was heated at 23 ° C. for 4 days and then for 30 days.
A specimen that is cured and cured for 3 days at ℃ is used as a test body after initial curing. After this initial curing, the specimen was further immersed in water at 23 ° C. for 24 hours and then cured at 70 ° C. for 6 cycles for 4 cycles. The above-mentioned initial post-curing test body and the cycle-curing test body were subjected to a tensile test at 23 ° C. at a tensile speed of 5 mm / min.

The pulling direction is the direction of arrow B shown in FIG.
That is, it is the direction in which the respective samples constructed from the aluminum adhered plate are separated. At this time, the stress when each test body was extended by 6 mm was measured as "50% tensile stress". And
The stress change rate was calculated by dividing the “50% tensile stress” of the cycle curing test body by the “50% tensile stress” of the initial post-curing test body, and used as a measure of long-term physical property stability.

<4> Evaluation of Curing Rate Stability For each sample, the cured thickness after standing at 5 ° C. and 40% RH for 16 hours and the surface curing time at 30 ° C. and 80% RH were measured. The thicker the cured thickness at 5 ° C. and 40% RH and the longer the surface curing time at 30 ° C. and 80% RH, the better the curing rate stability.

<5> Evaluation of coating suitability The top coating material shown in Embodiment 1 (reference numeral 1 in FIG. 1).
8)), "Jolipatt J" manufactured by Aika Kogyo Co., Ltd.
P100 "and" Jolipat JP700 "were applied onto each sufficiently cured sample (joint treatment material). After heating and curing this at 60 ° C. for 3 months, the presence or absence of softening was confirmed. Thus, the coating suitability of the top coating material for each sample was evaluated.

Table 3 shows the measurement results of the above evaluations (<1> to <5>).

[0063]

[Table 3]

As can be seen from the table, in terms of <1> adhesiveness, Samples 1 and 2 are equivalent to Comparative Sample 4, and are superior to Comparative Samples 1 to 3 and Comparative Samples 5 and 6. That is, it is understood that the elastic joint treatment material of the present invention has an elongation amount equal to or greater than that of the conventional elastic joint treatment material. Therefore, it can be seen that the jointless structure of the outer wall of the present invention has high followability to the movement of the outer wall material.

<2> Samples 1 and 2 for the thinning resistance
Is equivalent to the comparative sample 1 and is superior to the comparative samples 2 to 6. That is, it is understood that the elastic joint treatment material of the present invention has the same or more resistance to thinning as compared with the conventional elastic joint treatment material. Further, since the weight change is less than 2% by weight, joint thinness is small and the joint can be hidden by one joint treatment.

<3> Regarding physical properties stability, samples 1 and 2
Is equivalent to Comparative Samples 1 and 2, and is superior to Comparative Samples 3 to 6. That is, it can be seen that the elastic joint treatment material of the present invention has physical stability equal to or higher than that of the conventional elastic joint treatment material. Therefore, no joint cracks or outer wall damage will occur over the years.

<4> Regarding the stability of curing rate, Samples 1 and 2 have a cured thickness after standing for 16 hours at 5 ° C. and 40% RH that is equal to or more than that of the conventional elastic joint treatment material. It can be seen that the surface hardening time at 80 ° C. and 80% RH is equal to or longer than that of the conventional elastic joint treatment material. Therefore, it can be understood that the elastic joint treatment material of the present invention has a sufficient working time under high temperature and high humidity such as during the rainy season and summer, and has a short construction period under low temperature such as winter.

<5> Regarding the coating suitability, in Comparative Sample 6, the coating film was softened, whereas in Samples 1 and 2, the coating film was not softened. That is, it can be seen that the elastic joint treatment material of the present invention has a coating suitability equal to or higher than that of the conventional elastic joint treatment material. Therefore, it can be seen that in the jointless structure of the outer wall of the present invention, poor adhesion or contamination of the topcoat material is unlikely to occur.

[0069]

As described above, according to the present invention, the joint thinness is small, the joint can be hidden by one joint treatment, and the working time can be sufficiently taken in high temperature and high humidity such as rainy season or summer. To provide a jointless structure of an outer wall that has a short construction period at low temperatures such as in winter, is unlikely to cause poor adhesion or contamination of a topcoat material, does not cause joint cracks or damage to the outer wall over time, and an elastic joint treatment material used therefor. You can

[Brief description of drawings]

FIG. 1A is a perspective view of a jointless structure of an outer wall in Embodiment 1, and FIG. 1B is a cross-sectional view of an elastic joint treatment material coating portion.

FIG. 2 is a cross-sectional view of various butting structures of outer wall materials according to the second embodiment.

FIG. 3 is a cross-sectional view of various other associating structures of the outer wall material according to the second embodiment.

FIG. 4 is a cross-sectional view of various other associating structures of the outer wall material according to the second embodiment.

5A and 5B are cross-sectional views of other various associating structures of the outer wall material in the second embodiment.

FIG. 6 is a perspective view of a test body used for evaluation of physical property stability in an experimental example.

[Explanation of symbols]

1. ． ． Outer wall material, 11. ． ． Front side, 2. ． ． Butt, 3. ． ． Side edge, 6. ． ． Elastic joint treatment material, 7. ． ． Mesh,

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-145321 (JP, A) Jitsukaihei 2-39036 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04F 13/02

Claims (8)

(57) [Claims] 1. A plurality of outer wall materials are attached to a base material by abutting their side end portions with each other, and the outer side surface of the abutting portion of the side end portions is covered with an elastic joint treatment material. Further, a mesh-like body through which the elastic joint treatment material can penetrate is arranged inside the elastic joint treatment material, and the surface of the elastic joint treatment material layer is covered with an elastic coating material. In the structure, the elastic joint treatment material has a content of an organic solvent of less than 5% by weight, and is obtained by reacting an aliphatic diisocyanate compound and / or an alicyclic diisocyanate compound with an active hydrogen-containing compound. It comprises a urethane prepolymer containing two or more isocyanate groups per molecule and a compound which produces two or more thiol groups per molecule by hydrolysis. A jointless structure of an outer wall, characterized by comprising a one-component curable elastic composition which is cured by reacting a group to form a thiourethane bond. 2. The jointless structure of the outer wall according to claim 1, wherein the active hydrogen-containing compound is a polyether polyol and / or a polyester polyol. 3. The aliphatic diisocyanate compound and / or alicyclic diisocyanate compound according to claim 1 or 2, wherein hexamethylene diisocyanate, isophorone diisocyanate, 1,3-bis (isocyanatomethyl) -cyclohexane, 4,4′- A jointless structure of the outer wall, which is one or more kinds of diisocyanate compounds selected from methylenebis (cyclohexyldiisocyanate). 4. The urethane prepolymer containing at least two isocyanate groups per molecule according to claim 1, which is a liquid obtained by reacting a terminal hydroxyl group of polypropylene glycol with hexamethylene diisocyanate. A jointless structure of the outer wall characterized by being a compound. 5. The urethane prepolymer containing at least two isocyanate groups per molecule is a liquid compound obtained by reacting polypropylene glycol with isophorone diisocyanate. Characteristic outer wall jointless structure. 6. The method according to any one of claims 1 to 5,
The compound which forms two or more thiol groups per molecule by the above-mentioned hydrolysis is a polysulfide polymer having a trimethylsilylthio group terminal, and a jointless structure of the outer wall. 7. The method according to any one of claims 1 to 6,
The outer wall material is a ceramic-type building board, which is a jointless structure of the outer wall. 8. A jointless structure of an outer wall, comprising a plurality of outer wall materials, the side ends of which are abutted against each other, mounted on a base material, and the surface of the outer wall material is covered with an elastic coating material. An elastic joint treatment material for covering the front side surface of the abutting portion of the outer wall material side end portion, wherein the elastic joint treatment material has an organic solvent content of less than 5% by weight, and an aliphatic diisocyanate compound and And / or a urethane prepolymer containing two or more isocyanate groups per molecule obtained by reacting an alicyclic diisocyanate compound with an active hydrogen-containing compound, and two or more thiol groups per molecule by hydrolysis. It is a one-component curable elastic composition which is composed of a compound that is formed and is cured by the reaction of the above-mentioned isocyanate group and the above-mentioned thiol group to form a thiourethane bond. An elastic joint treatment material characterized by: