JPH0386782A - Sealing structure of gap on the surface of a structure and sealing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealing structure and method for sealing gaps on the surface of a structure such as joints.

[Conventional technology]

The surfaces of structures such as houses are often finished with a large number of panels and tiles to improve their appearance.The joints of these panels and tiles are filled with sealant to prevent water from entering. Preventing it from entering.

[Problem to be solved by the invention]

However, sealing materials tend to attract dirt, sand, and the like, so they tend to get dirty and turn black, spoiling the appearance of the structure's surface.

Therefore, the first object of the present invention is to provide a sealing structure for gaps on the surface of a structure that is hard to get dirty, or even if it gets dirty, the dirt can be easily removed. Furthermore, a second object of the present invention is to provide a sealing method that can easily obtain a sealing structure for gaps on the surface of a structure that is resistant to staining or that is easy to remove even if contaminated. .

[Means to solve the problem]

In order to solve the first problem described above, the sealing structure for gaps on the surface of a structure according to the present invention is such that the gap on the surface of the structure is filled with a sealant, and the surface of the sealant is coated with a stain-preventing coating made of fluororesin. is formed.

In order to solve the above second problem, the method for sealing gaps on the surface of a structure according to the present invention includes filling a gap in the surface of the structure with a sealant, and then applying the same sealant to the surface of the structure without the same sealant. During curing, an antifouling agent made of a fluororesin dissolved in an organic solvent is spray applied to form an antifouling film.

The structure is, for example, a building such as a house, or a structure other than a building such as a gate or a fence. The surface of the structure may be indoors or outdoors.

Gaps on the surface of a structure include, for example, gaps between interior and exterior materials such as panels and tiles, depressions on the surface of the structure,
A hole drilled for passing piping, etc.

The sealing material is not particularly limited as long as it is used for construction, and examples thereof include modified silicone sealing materials, polyurethane sealing materials, and the like.

The fluororesin that forms the antifouling film is not particularly limited as long as it is a polymer that has a C-F bond in its molecules, but from the point of view of forming a film that adheres to the surface of the sealant, fluororesins that are soluble in solvents are preferred. It is preferable that Examples of fluororesins soluble in solvents include general
It is preferable to use a compound (e.g., a polymer) having a perfluoroalkyl group represented by the formula (where n is an integer from 4 to 20). In the above general formula, if n is less than 4, the antifouling ability may be too low. If n exceeds 20, the solubility may become too low.

The antifouling film made of the fluororesin is formed, for example, by applying an antifouling agent prepared by adding the fluororesin to an organic solvent to an object to be coated, removing the solvent by drying, etc., and forming a film. Note that the antifouling film can also be formed using a fluororesin emulsion or the like.

Examples of the organic solvent include, but are not limited to, solvents that dissolve the fluororesin, such as a mixture of isopropyl alcohol (IPA) and ethyl acetate, and xylene. , a solvent suitable for the emulsion may be used.

The antifouling agent may contain one or more components other than the fluororesin and the solvent, such as a spraying agent and an emulsifier. As the spray agent, for example, one that has been passed through the spraying of a fluororesin such as dimethyl ether may be used.

The ratio of the fluororesin and the solvent in the antifouling agent may be set as appropriate depending on the application method. For example, when spraying, the ratio of fluororesin: solvent = 2: It is preferable to use a ratio of 98 to 15:85 (weight ratio), and when applying with a brush,
Fluororesin:solvent=5:95-20:80 (weight ratio)
It is preferable that

As for the application method, from the point of view of work efficiency, spray application is preferable, but methods such as brush application can also be used.

There is no particular restriction on the timing of forming the stain-preventing film, as long as it is after the sealant is applied (including at the time of installation), but the sealant can be applied and coated at the same time, leaving the sealant surface in the atmosphere. From the point of view of shortening the exposure time, it is preferable to use the sealant between the time of application and the uncured stage. In addition, when applying the stain preventive agent or the like to the surface of the uncured sealant, it is preferable to perform spray application in order to prevent the surface of the sealant from becoming rough.

After applying the stain prevention agent, the solvent is removed by natural drying, heat drying, etc., and a stain prevention coating made of fluorine resin JJi7 is formed.

The antifouling film may be formed only on the surface of the sealant, but even if it is formed from the surface of the sealant to the surface of the base material, it can appear colorless and transparent. Even if the surface of the base material is partially covered, the appearance will not be adversely affected.

[For production]

The stain-preventing film formed on the surface of the sealant is made of fluororesin, so it is highly repellent to liquids, water, and oily substances. For this reason, dirt, dust, etc. adhere to the surface, and the progress of staining is slowed down. In addition, even if it gets dirty, it can be easily cleaned (it has excellent dirt cleaning properties).

〔Example〕

FIG. 1 shows an embodiment of a sealing structure for gaps on the surface of a structure according to the present invention. As seen in this figure, the sealing structure 1 is constructed by filling gaps (for example, joints) 4 between exterior materials 3 and 3 laid on a base material 2 with a sealant 5, and then applying the same sealant 5. A stain-preventing coating 6 made of fluororesin is formed on the surface. Anti-fouling liquid I5
! 6 may cover only the surface of the sealing material 5, but may also cover from the surface of the sealing material 5 to the surface of the exterior material 3, as shown in this figure. In this figure, the antifouling coating 6 is exaggerated in terms of thickness, but in reality it can be made very thin.

In the conventional sealing structure 1o, as shown in FIG. 2, the surface of the sealing material 5 was exposed. Therefore, specific examples and comparative examples of the present invention are shown below in which dirt easily adheres, but the present invention is not limited to the following examples.

Example 1 - 10 parts by weight of fluororesin (Bonflon 9000J manufactured by Asahi Glass Coat and Resin Co., Ltd.) and a mixed solvent of IPA and ethyl acetate (IPA: ethyl acetate - 80:20)
(Weight ratio)] An antifouling agent having a weight of 990 was prepared.

As shown in FIG. 3, two pieces of ceramic siding material 13.13 having a length of 150 sn x width of 20 n x thickness of 12 slender were laid side by side at an interval of 30 m, and the gap 4 between them was filled with a sealing material 5.

Here, as a sealant, we use Cemedine Co., Ltd. product RPOS Seal (modified silicone sealant).
was used.

Immediately after applying the sealant (the sealant was not yet cured), the antifouling agent was spray applied to form the antifouling film 6. The coating amount was approximately 70 g/rd.

Example 2 - The same procedure as in Example 1 was carried out except that Cemedine 5700J (polyurethane sealing material) manufactured by Cemedine Co., Ltd. was used as the sealant.

Example 3 - The same procedure as Example 1 was carried out except that the sealant was applied by spraying an antifouling agent after being cured for 1 day and 1 day.

Example 4 - Application of sealant The same procedure as Example 2 was carried out except that the sealant was allowed to cure for txt days and then the antifouling agent was spray applied.

Example 5 - The same procedure as Example 1 was carried out, except that the sealant was cured one day after application and then the antifouling agent was applied with a brush. The coating amount was about TOg/rd.

Example 6 - The same procedure as Example 2 was carried out, except that the sealant was cured one day after application, and then the antifouling agent was applied with a brush. The coating amount was approximately 70 g/rrr.

Comparative Example 1 - The same procedure as Example 1 was carried out except that no antifouling agent was applied to the surface of the sealant and no antifouling film was formed.

Comparative Example 2 - The same procedure as Example 2 was carried out except that no antifouling agent was applied to the surface of the sealant and no antifouling coating was applied.

The following tests were conducted on the sealing structures obtained in the above Examples and Comparative Examples. The results are shown in Table 1.

The amount of residual silica sand adhered to the surface of the sealant is 42 to 200.
After uniformly sprinkling mesh black silica sand, the test piece was held vertically and struck on the table 2 to 3 times to remove the silica sand, and the adhered area ratio was determined by observing the state of the adhered silica sand. This adhesion area ratio is based on the sealant surface (
10 mfi In addition, the comparative example was examined immediately after the sealant was applied and after one day had passed.

Each sealing structure was placed outdoors for 12 months with the surface of the sealant facing horizontally south, forming vertical joints, and an exposure test was conducted, and the adhesion of dirt on the sealant was visually observed. It was evaluated as follows.

○... Almost no dirt adhesion △... Some dirt adhesion ×... Dirt adhesion × ×... Marked dirt adhesion Table 1 As shown in Table 1, the sealant of the example was filled. The finished structure of the part has almost no silica sand adhesion, and there is almost no staining even after 12 months of outdoor exposure.

On the other hand, in the comparative example, silica sand was adhered to the entire surface of the sealant, and staining was noticeable after 12 months of outdoor exposure.

[Effects of the Invention] As described above, in the sealing structure for gaps on the surface of a structure according to the present invention, the gap on the surface of the structure is filled with a sealant, and the surface of the sealant is coated with a stain-preventing material made of fluororesin. Because a film is formed, it is difficult to get dirty.
Or even if it gets dirty, the dirt is easy to remove.

As described above, in the method for sealing gaps on the surface of a structure according to the present invention, after filling the gap on the surface of the structure with a sealant, the sealant is applied to the surface of the structure while the sealant is uncured. , a stain-preventing agent made by dissolving fu-no-resin in an organic solvent is spray applied to form a stain-preventing film, making it easy to remove stains or even if they become dirty. , it is possible to easily obtain a sealing structure for gaps on the surface of the structure.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a sealing structure for gaps on the surface of a structure according to the present invention, FIG. 2 is a cross-sectional view of an example of a conventional sealing structure, and FIG. 3 is a concrete example of the sealing structure. It is an explanatory diagram of the sealing structure of the example and the comparison/example, and
al is a plan view, and the same figure (b) is a side sectional view.

Claims (1)

[Scope of Claims] 1. A structure for sealing gaps on the surface of a structure, in which the gap on the surface of the structure is filled with a sealant, and a stain-preventing coating made of fluororesin is formed on the surface of the sealant. 2. After filling the gaps on the surface of the structure with a sealant, spray a stain preventive agent made of a fluororesin dissolved in an organic solvent onto the surface of the sealant while the sealant is still uncured to prevent stains. A method of sealing gaps on the surface of a structure so as to form a protective film.