JP3874652B2 - Construction method of sheet building materials - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a sheet building material that is excellent in stain resistance and has followability to joints.
[0002]
[Prior art]
In recent years, in the interior / exterior finishing of a building structure, for the purpose of simplifying construction and improving aesthetics, a method of attaching a sheet building material with an adhesive has been performed. Since such a sheet building material is manufactured by pre-coating, various decorative layers having high design properties can be provided. Moreover, since it finishes only by sticking using an adhesive agent at the time of construction, it has the characteristics that a curing process etc. can be simplified without requiring a skilled worker.
[0003]
When such a sheet building material is applied as an outer wall finish, performances such as protection of the base material and prevention of water leakage are required. In particular, when construction is performed on a base material provided with joints, it is an indispensable condition to have follow-up performance with respect to the movement of joints.
Therefore, a sheet construction material having excellent waterproofness and elasticity is marketed and used. In addition, a construction method for ensuring followability to the joint has been proposed. For example, Japanese Patent Laid-Open No. 2-308059 discloses a method of sticking a sheet building material having an elongation of 2% or more across a joint.
[0004]
[Problems to be solved by the invention]
However, the sheet building material having extensibility has waterproofness and followability to the joint portion, but the decorative layer is relatively flexible, so that the problem of contamination is likely to occur.
As a sheet building material with improved contamination resistance, for example, in JP-A-4-347251, a sheet building material provided with a transparent sheet on the surface layer is proposed, but the sheet building material of the publication is poor in extensibility. It did not have sufficient followability to the joint part.
[0005]
[Means for Solving the Problems]
In order to solve such a problem, the present inventor paid attention to the processing method for the joint part, and as a result, applied a putty material having a specific elongation rate to the joint and its peripheral part with a specific width. The present inventors have found that even a sheet building material having a relatively small extensibility can obtain performance excellent in joint followability.
[0006]
That is, the present invention has the following characteristics.
1. In constructing a sheet building material on a base material having a joint part, after filling the joint part with a sealing material, a putty material having the same or different composition as the sealing material and an elongation of 50 to 1000% is used. The construction method of the sheet building material characterized by sticking with the width | variety of 10-100 times the joint width centering on, and sticking the sheet building material of less than 2% of elongation rate on it via an adhesive agent.
2. In constructing a sheet building material on a base material having a joint part, after filling the joint part with a sealing material, a putty material having the same or different composition as the sealing material and an elongation of 50 to 1000% is used. Is applied at a width 10 to 100 times the joint width, and an elastic cloth is interposed in or inside the putty material, and a sheet building material having an elongation rate of less than 2% is placed thereon. The construction method of the sheet building material characterized by sticking through.
3. 1. A sheet building material in which a low-pollution paint is applied to the surface of the decorative layer is used. Or 2. Construction method of sheet building materials as described in 1.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on the embodiments.
[0008]
As a base material which has a joint part, an ALC panel, a PC panel, a siding board, an extrusion molding board, a calcium silicate board, a pearlite board etc. are mentioned, for example. The surface of these base materials may have been subjected to some surface treatment (for example, a sealer, a surfacer, a filler, etc.).
[0009]
In the present invention, first, the sealing material is filled into the joints of these base materials, but a backup material filling, primer coating, or the like may be performed in advance. As the backup material, for example, a foamed polyethylene-based backup material or the like can be used. As the primer, for example, a synthetic rubber primer, an acrylic primer, a urethane primer, an epoxy primer, a silicone resin primer, a silane primer, or the like can be used.
[0010]
Common sealants can be used, such as silicone sealants, modified silicone sealants, polysulfide sealants, modified polysulfide sealants, acrylic urethane sealants, polyurethane sealants, SBR. And the like, and butyl rubber sealing material.
The filling method of the sealing material is not particularly limited, and for example, a known method such as filling with a gun can be employed. After filling with the sealing material, it is desirable to press and press with a spatula or the like so that the sealing material reaches inside the joint and adheres sufficiently to the base material.
[0011]
After filling with the sealing material, a putty material having an elongation of 50 to 1000% (preferably 100 to 700%) is applied.
As such a putty material, the same or different composition as the sealing material can be used. Specifically, for example, silicone-based putty materials, modified silicone-based putty materials, polysulfide-based putty materials, modified polysulfide-based putty materials, acrylic urethane-based putty materials, polyurethane-based putty materials, acrylic-based putty materials, SBR-based putty materials, Examples include butyl rubber-based putty materials.
[0012]
If the elongation rate of the putty material is less than 50%, the followability with respect to the joint portion becomes insufficient, and if it exceeds 1000%, the sheet building material cannot follow the movement of the putty material and cracks occur. The elongation percentage in the present invention is a value measured by the method of “Elongation test at 20 ° C.” of JIS A6909 7.31 “Elongation test”.
[0013]
The coating width when applying the putty material to the joint portion is 3 to 100 times (preferably 10 to 50 times) the joint width centering on the joint portion. If the coating width is less than 3 times, the movement of the joint portion cannot be sufficiently buffered, and the sheet building material may be cracked. If it exceeds 100 times, the amount of putty material applied becomes excessive, which is economically disadvantageous.
[0014]
In the present invention, when applying the putty material, it is desirable to interpose a stretchable cloth inside or on the top of the putty material. By using such a cloth, the tensile strength of the joint can be improved and sufficient follow-up performance can be obtained. The cloth used here is not particularly limited as long as it has stretchability, and examples thereof include natural fiber cloth and synthetic fiber cloth.
Further, depending on the type of putty material to be used, a sealer may be further applied on the putty in order to improve adhesion to the adhesive.
[0015]
In the next step, a sheet building material having an elongation of less than 2% is pasted through an adhesive.
The adhesive is not particularly limited as long as it can bond the base material and putty material to the sheet building material, and various adhesives can be used. Specific examples include rubber adhesives, epoxy adhesives, acrylic adhesives, urethane adhesives, and the like.
[0016]
The sheet building material used in the present invention has an elongation rate of less than 2%, high hardness, and resistance to dirt. When such a sheet building material is applied to a base material having a joint portion by a normal method, there is a risk of cracking. However, in the present invention, since the specific treatment as described above is performed, the occurrence of cracking is prevented. Can do. If the elongation percentage of the sheet building material is 2% or more, the decorative layer tends to become dirty.
In addition, the elongation rate of the sheet building material in this invention is measured using a tensile tester. In particular,
(1) The sheet building material is cut into a width of 50 mm and a length of 150 mm (hereinafter referred to as “test body”).
(2) The specimen is fixed to a tensile tester with a chuck distance of 100 mm (this chuck distance is A).
(3) Pulling is performed at a pulling speed of 100 mm / min until abnormalities such as cracks occur on the surface of the specimen (the distance between chucks at this time is B).
It is a value calculated by the following formula measured by the procedure of
(Formula) Elongation (%) = [(BA) / A] × 100
[0017]
The sheet building material in the present invention is not particularly limited as long as the elongation is less than 2%, and various sheet building materials can be used. Examples thereof include those obtained by curing and molding a composition containing a synthetic resin and a colored aggregate, or those obtained by embedding a woven fabric, nonwoven fabric, glass cloth, synthetic paper or the like in these molded products. The thickness of the sheet building material is approximately 1 to 10 mm.
[0018]
In the present invention, in order to improve the stain resistance, it is desirable to apply a low-pollution paint to the surface of the decorative layer of the sheet building material. As such a low-contamination paint, those having a contact angle with respect to water of the coating surface of 70 ° or less are suitable. For example, a paint containing an alkoxysilane compound such as silicate can be used.
[0019]
【Example】
Examples are given below to clarify the features of the present invention.
[0020]
Example 1
The short sides of two siding boards (150 x 70 mm) are butted with a width of 10 mm, and the one-part moisture-curing polyurethane sealant (trade name “SK Elastic Coke Sealant”; SK Kaken) ).
After curing for 72 hours at a temperature of 20 ° C and a humidity of 65% (hereinafter referred to as "standard condition"), a one-part moisture-curing polyurethane putty material (product name "SK Elastic Coke N"; SK Kaken Co., Ltd.) (Made by company) was applied with a width of 200 mm around the sealing material filling part.
After curing for 24 hours under standard conditions, a sheet building material (trade name “Granipiere”; manufactured by SK Kaken Co., Ltd.) with an elongation rate of 1.7% is used as an acrylic adhesive (product name “Granipiere primer”; SK Kaken Co., Ltd.) This was used as a test specimen.
After curing for 14 days in a standard state, the elongation until a defect such as a crack occurred on the surface of the test body was measured using a tensile tester. Note that the pulling speed at this time was 1 mm / min.
As a result, Example 1 showed an elongation of 7.3 mm.
[0021]
(Example 2)
The test was performed in the same manner as in Example 1 except that the putty material was replaced with an acrylic putty material having an elongation of 310% (trade name “elastic joint treatment material”; manufactured by SK Kaken Co., Ltd.). As a result, Example 2 showed an elongation of 6.5 mm.
[0022]
(Example 3)
The test was conducted in the same manner as in Example 1 except that a stretchable cloth (trade name “SK Soft Cloth”; manufactured by SK Kaken Co., Ltd.) was interposed inside the putty material. As a result, Example 3 showed an elongation of 7.7 mm.
[0023]
(Comparative Example 1)
The test was performed in the same manner as in Example 1 except that the putty material was omitted. As a result, in Comparative Example 1, the elongation was 1.8 mm.
[0024]
(Comparative Example 2)
The test was performed in the same manner as in Example 1 except that the application width of the putty material was 20 mm. As a result, in Comparative Example 2, the elongation was 2.1 mm.
[0025]
(Comparative Example 3)
The test was conducted in the same manner as in Example 1 except that the putty material was replaced with an acrylic putty material having an elongation rate of 40%. As a result, in Comparative Example 3, the elongation was 2.3 mm.
[0026]
(Comparative Example 4)
The test was performed in the same manner as in Example 1 except that the sealing material and the putty material were omitted and the sheet building material was replaced with a sheet building material having an elongation rate of 3.5%. As a result, in Comparative Example 4, the elongation was 2.2 mm.
[0027]
【The invention's effect】
According to this invention, even if it is a sheet building material with comparatively small extensibility, followable | trackability with respect to a joint part can fully be ensured.

Claims (3)

In constructing a sheet building material on a base material having a joint part, after filling the joint part with a sealing material, a putty material having the same or different composition as the sealing material and an elongation of 50 to 1000% is used. The construction method of the sheet building material characterized by sticking with the width | variety of 10-100 times the joint width centering on, and sticking the sheet building material of less than 2% of elongation rate on it via an adhesive agent. In constructing a sheet building material on a base material having a joint part, after filling the joint part with a sealing material, a putty material having the same or different composition as the sealing material and an elongation of 50 to 1000% is used. Is applied at a width 10 to 100 times the joint width, and an elastic cloth is interposed in or inside the putty material, and a sheet building material having an elongation rate of less than 2% is placed thereon. The construction method of the sheet building material characterized by sticking through.   The construction method of the sheet | seat building material of Claim 1 or 2 using the sheet | seat building material by which a low-pollution paint is applied to the decorative layer surface.