JPH0711744A - Multiple layer system coating film waterproofing structure - Google Patents

Abstract

PURPOSE:To heighten strength of a surface layer while following deformation of a backing by changing a compositional ratio as well as constituting a material of each waterproofing layer of the same composition. CONSTITUTION:On a backing 1, a first waterproofing layer 2 is applied. Thereafter, by applying a second waterproofing layer 3 on its surface, it is made to be multiple layer system film waterproofing. The waterproofing layers 2, 3 are made of a material of the same composition. Simultaneously, its compositional ratio is changed so that a shear modulus of the waterproofing layer 2 becomes lower than the waterproofing layer 3. Consequently, against deformation of the backing due to growth of a crack and others, it is possible to follow with the lower side waterproofing layer 2 of a low shear modulus, to restrain transmission of stress accompanying deformation such as crack growth, etc., of the backing to the upper side waterproofing layer 3 and to hold a tough film property.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a roof or an eaves, a balcony or a veranda, a double wall or floor of a basement, an outer wall, a tank or a tank, a kitchen or a toilet, a bathroom, etc. The present invention relates to a multilayer coating film waterproof structure in which layers are laminated and closely applied.

[0002]

2. Description of the Related Art In the case where a waterproof layer is closely applied to a base as described above, conventionally, when the base is deformed due to cracking or the like, the waterproof layer is damaged under the influence of the base, and the waterproof function is apt to deteriorate. There was a problem. Therefore, it is considered that the waterproof layer is made of a material having a low shear elastic modulus so that the waterproof layer can easily follow a large deformation of the base.

[0003]

However, in the case of a material having a low shear modulus as described above, the surface layer becomes soft, so that the strength of the surface layer is lowered and the external damage resistance is deteriorated. There was a drawback that caused trouble.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to make it possible to increase the strength of the surface layer while being able to follow deformation such as cracking of the underlayer.

[0005]

In order to achieve the above-mentioned objects, the present invention is a multilayer coating film waterproof structure in which a plurality of waterproof layers are laminated and applied in close contact with a base, and The layers are made of the same composition, and the composition ratio is set so that the shear elastic modulus of the lower waterproof layer is lower than that of the upper waterproof layer.

[0006]

According to the structure of the multi-layer coating waterproof structure of the present invention,
While the adhesion between layers can be increased with the same composition, the lower waterproof layer with a low shear modulus can follow the deformation of the underlying layer such as cracks, and the stress due to the deformation of the underlying layer can be transmitted to the upper waterproof layer. The restraint and surface strength can be ensured by the upper waterproof layer, which has a high shear modulus.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a multi-layer coating waterproof structure according to the present invention, in which a first waterproof layer 2 as a lower waterproof layer is applied to a base 1 and its first The second waterproof layer 3 as an upper waterproof layer is applied to the surface of the waterproof layer 2 of
A multi-layer coating waterproof structure is constructed.

The first and second waterproof layers 2 and 3 are made of materials having the same composition. Alumina cement is used as a hydraulic binder, No. 8 silica sand is used as an aggregate, and clay or calcium carbonate is used as a filler. And an acrylic rubber-based emulsion having a resin content of about 50% as a polymer, to which the minimum amount of water and additives necessary for kneading are added.

<First Example> To 100 parts by weight of alumina cement, 50 parts by weight of No. 8 silica, 350 parts by weight of filler, and 750 parts by weight of polymer were added and kneaded.
To form the first waterproof layer 2, and on the surface of the first waterproof layer 2, 100 parts by weight of alumina cement, 50 parts by weight of No. 8 silica, 350 parts by weight of filler, and 500 parts by weight of polymer. The second waterproof layer 3 was formed by adding the respective parts by weight and kneading, and the second waterproof layer 3 was aged for a predetermined period to form a multilayer coating film waterproof structure.

<Second Embodiment> To 100 parts by weight of alumina cement, 50 parts by weight of No. 8 silica, 350 parts by weight of filler, and 1000 parts by weight of polymer were added and kneaded.
To form the first waterproof layer 2, and on the surface of the first waterproof layer 2, 100 parts by weight of alumina cement, 50 parts by weight of No. 8 silica, 350 parts by weight of filler, and 500 parts by weight of polymer. The second waterproof layer 3 was formed by adding the respective parts by weight and kneading, and the second waterproof layer 3 was aged for a predetermined period to form a multilayer coating film waterproof structure.

Next, the experimental results which are the basis of the present invention will be described. As a test piece, as shown in the perspective view of FIG. 2, a notch 4 for breaking is formed in the central portion of a base 1 made of slate having a thickness of 4 mm and a size of 70 × 150 mm, and on the base 1, The following examples and comparative examples were applied and cured by curing at a temperature of 20 ° C. and a relative humidity of 65% for 7 days. In the example, the first waterproof layer 2 was formed, and then the second waterproof layer 3 was formed at intervals of one day. In FIG. 2, the first and second waterproof layers 2,
3 shows a configuration of No. 3.

<First Example for Experiment> The coating film thickness of each of the first and second waterproof layers 2 and 3 in the first example was set to 1 mm. <Second Example for Experiment> The coating thickness of each of the first and second waterproof layers 2 and 3 in the second example was set to 1 mm. <Third Example for Experiment> The coating thickness of the first waterproof layer 2 in the first embodiment was set to 1.5 mm, while the coating thickness of the second waterproof layer 3 was set to 1 mm. <Fourth Example for Experiment> The coating thickness of the first waterproof layer 2 in the second embodiment was set to 1.5 mm, while the coating thickness of the second waterproof layer 3 was set to 1 mm.

<First Comparative Example for Experiment> Only the second waterproof layer 3 in the above-mentioned first example was applied in a thickness of 1 mm. <Second Comparative Example for Experiment> Only the first waterproof layer 2 in the first example described above was applied to a film thickness of 1 mm. <Third Comparative Example for Experiment> Only the first waterproof layer 2 in the above-mentioned second example was applied in a thickness of 1 mm.

Using each of the specimens constructed as described above, the base 1 was broken at the notches 4 and only the base 1 was sandwiched so as not to cover the coating film, and the long side was pulled at a speed of 5 mm / min. Displacement amount when cracks are visually confirmed (m
When m) was measured, the following results were obtained. Experimental First Example: 4.2 mm Experimental First Comparative Example: 1.8 mm Experimental First Example: 5.0 mm Experimental First Comparative Example: 4.0 mm Experimental First Example Example: 6.1 mm First comparative example for experiment: 4.2 mm First example for experiment: 6.4 mm

From the above results, the second waterproof layer 3 can follow only 1.8 mm as a single layer, but by incorporating the first waterproof layer 2 into it, the following width can be increased, and , Compared to the case of a single layer as in the comparative example,
It was clear that restraining the first waterproof layer 2 with the second waterproof layer 3 can improve the followability. For this reason,
In the case of the above-mentioned embodiment, the second waterproof layer 3 having a small following width can improve the external damage resistance of the surface thereof, and further, the influence of the deformation such as the crack of the base 1 is transmitted to the second waterproof layer 3. It is clear that this can be satisfactorily avoided.

In the above embodiment, the two-layer structure has been explained, but three layers are used.
It may be composed of more layers. In addition, the second waterproof layer 3
A protective layer may be formed on the surface of the.

[0018]

As described above, according to the structure of the multilayer waterproof coating structure of the present invention, the lower waterproof layer having a low shear elastic coefficient follows the deformation of the base such as cracks. ,
Since the stress due to the deformation of the underlayer can be suppressed from being transmitted to the upper waterproof layer, it is possible to avoid the propagation of cracks to the upper waterproof layer and to maintain the tough film physical properties. Moreover, since the strength of the surface layer is secured by the upper waterproof layer having a high shear elastic coefficient, it is possible to improve the external damage resistance. Is eliminated, and the reliability of the waterproof coating can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a multilayer coating film waterproof structure according to the present invention.

FIG. 2 is a perspective view of a test piece.

[Explanation of symbols]

 1 ... Foundation 2 ... 1st waterproof layer 3 ... 2nd waterproof layer

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[Procedure amendment]

[Submission date] July 29, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

Using each of the specimens constructed as described above, the base 1 was broken at the notch 4, and only the base 1 was sandwiched so as not to cover the coating film, and the long side was pulled at a speed of 5 mm / min. When the amount of displacement (mm) when a crack was visually confirmed was measured, the following results were obtained. First Experimental Example: 4.2 mm First Experimental Comparative Example: 1.8 mm Second Experimental Example: 5.0 mm Second Experimental Example: 4.0 mm Third Experimental Example Example: 6.1 mm Third comparative example for experiment: 4.2 mm Fourth example for experiment: 6.4 mm

Claims (1)

[Claims] 1. A multi-layer coating waterproof structure in which a plurality of waterproof layers are laminated and applied in close contact on a base, and the materials of each waterproof layer are composed of the same composition, and the composition ratio is lower waterproof. A multi-layer coating waterproof structure, characterized in that the shear elastic modulus of the layer is lower than that of the upper waterproof layer.