JP2010248295A - Dumping coating composition for roof and roof structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dumping coating composition for roof capable of easily suppressing the generation of popping in coating while maintaining an effect of reducing a sound of falling rain, and a roof structure. <P>SOLUTION: This dumping coating composition for roof comprises: an aqueous resin dispersion in which resin particles for forming a coating film 12 are dispersed in an aqueous dispersion medium; and a non-swelling mica having an average particle diameter of 1 to 50 μm and an aspect ratio of 30 to 50, and is applied to a metal-made roof material 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vibration-damping coating composition for roof and a roof structure using the same.

  As a roof structure in consideration of vibration damping properties, a structure in which a roof material and a base material are bonded using a vibration damping adhesive, a structure in which a vibration damping sheet is pasted on the back side of a folded plate, and the like are known. (See Patent Documents 1 and 2). Such a roof structure reduces the sound of rain generated by metal roofing materials during rainfall. Moreover, the coating material containing scaly pigments, such as mica, is known as a coating material applied to a roofing material (refer patent document 3).

JP 2005-009205 A JP-A-10-306550 JP 2003-238897 A

  By the way, in the vibration-damping coating composition for roofs, for example, as the drying temperature is increased, the surface appearance of the coating film becomes uneven or the pinhole is easily formed in the coating film. This phenomenon is generally referred to as an armpit and can be a defect on the surface of the coating film. Conventional roof vibration-damping coating compositions have a problem that it is difficult to maintain the effect of reducing rain noise and to suppress the occurrence of such cracks.

  The present invention has been made by finding out that, as a result of earnest studies on non-swellable mica to be blended in the composition, it is possible to maintain the rain noise reduction effect and to suppress the occurrence of cracks.

  An object of the present invention is to provide a vibration-damping coating composition for a roof and a roof structure, which can maintain the rain noise reduction effect and can easily suppress the occurrence of armpits.

  In order to achieve the above object, a vibration-damping coating composition for a roof according to claim 1 includes an aqueous resin dispersion in which resin particles forming a coating film are dispersed in an aqueous dispersion medium, and a non-swellable mica. The anti-swelling mica has a mean particle size of 1 to 50 μm and is applied to a metal roofing material. The gist of the aspect ratio is 30-50.

The invention according to claim 2 is characterized in that, in the vibration-damping coating composition for roof according to claim 1, acrylic resin particles are included as the resin particles.
The gist of the roof structure of the invention described in claim 3 is that the coating film formed from the vibration-damping coating composition for roof according to claim 1 or 2 is laminated on a metal roofing material. To do.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration damping coating composition for roofs and roof structure which can maintain the rain sound reduction effect and can suppress generation | occurrence | production of an armpit can be provided.

The fragmentary sectional view which shows the roof structure of this embodiment. The schematic diagram which shows the outline of a rain sound test apparatus.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.
The roof vibration-damping coating composition in this embodiment contains an aqueous resin dispersion in which resin particles forming a coating film are dispersed in an aqueous dispersion medium, and non-swellable mica. The average particle diameter of non-swellable mica is 1 to 50 μm. The aspect ratio of non-swellable mica is 30-50.

  Examples of the polymer material constituting the resin particles include acrylic resins, acrylic / styrene resins, urethane resins, phenol resins, vinyl chloride resins, vinyl acetate resins, vinyl acetate / acrylic resins, ethylene / acetic acid. Examples thereof include at least one selected from vinyl resins, epoxy resins, polyester resins, alkyd resins, acrylonitrile / butadiene copolymer rubbers, styrene / butadiene copolymer rubbers, butadiene rubbers, and isoprene rubbers. These polymer materials may be modified.

  The resin particles may be formed of a single type of polymer material or may be formed of a plurality of types of polymer material. Furthermore, the aqueous resin dispersion may contain resin particles composed of these polymer materials alone, or may contain a plurality of types of resin particles.

Among the resin particles, it is preferable to include acrylic resin particles from the viewpoint that it is easy to adjust the temperature range in which the vibration damping performance is exhibited to around room temperature.
Examples of the acrylic resin forming the acrylic resin particles include homopolymers having acrylic acid, acrylic ester, methacrylic acid and methacrylic ester as monomers, mixtures of these homopolymers, and monomers. And a copolymer obtained by polymerizing. Examples of acrylic acid ester and methacrylic acid ester include methyl ester, ethyl ester, propyl ester, butyl ester, 2-ethylhexyl ester, ethoxyethyl ester and the like.

  Among the acrylic resin particles, a copolymer of methyl methacrylate and butyl acrylate is preferable from the viewpoint that it is easier to adjust the temperature range in which vibration damping performance is exhibited to around room temperature.

  The content of the acrylic resin particles with respect to the total amount of the resin particles is preferably 90% by mass or more, more preferably 95% by mass or more. Most preferably, the total amount of resin particles is acrylic resin particles.

Examples of the aqueous dispersion medium for dispersing the resin particles include water and a mixed liquid of water and a monohydric alcohol. Examples of the monohydric alcohol include methanol and ethanol.
Non-swelling mica reduces rain noise by enhancing the vibration damping performance of the coating film. The average particle diameter of non-swellable mica is 1 to 50 μm. When the average particle size of the non-swellable mica is less than 1 μm, it may be difficult to adjust the aspect ratio. If the average particle size of the non-swellable mica exceeds 50 μm, the occurrence of cracks may not be suppressed. The aspect ratio of non-swellable mica is 30-50. If the aspect ratio of the non-swellable mica is less than 30, the rain noise reduction effect may not be sufficiently obtained. On the other hand, when the aspect ratio of non-swellable mica exceeds 50, there is a possibility that the occurrence of cracks cannot be suppressed.

  The average particle diameter is a 50% volume average particle diameter (D50 value) in the cumulative distribution of particle sizes obtained by the laser light scattering method. The aspect ratio is an average of measured values obtained by selecting 50 non-swellable mica at random and observing the major axis and thickness of the non-swellable mica in observation with a scanning electron microscope.

  Examples of the non-swellable mica include synthetic non-swellable mica such as fluorine phlogopite and potassium tetrasilicon mica, and natural non-swellable mica such as muscovite, phlogopite, biotite, and sericite. These non-swellable mica may be blended singly or in combination of a plurality of types.

  The content of the non-swellable mica is preferably 100 to 800 parts by mass with respect to 100 parts by mass of the resin particles contained in the composition. When the content of the non-swellable mica is less than 100 parts by mass with respect to 100 parts by mass of the resin particles contained in the composition, the rain noise reduction effect may not be sufficiently obtained. On the other hand, when the content of the non-swellable mica exceeds 800 parts by mass with respect to 100 parts by mass of the resin particles contained in the composition, there is a possibility that the applicability of the composition to the metal roofing material cannot be obtained sufficiently. is there.

  Moreover, content of non-swellable mica is 100-400 mass parts with respect to 100 mass parts of water | moisture contents contained in a composition. When the content of non-swellable mica is less than 100 parts by mass with respect to 100 parts by mass of water contained in the composition, there is a problem that cracks are likely to occur. On the other hand, when the content of non-swellable mica exceeds 400 parts by mass with respect to 100 parts by mass of water contained in the composition, the above applicability may not be sufficiently obtained.

  If necessary, the vibration-damping coating composition for roof may contain a filler other than non-swellable mica. Examples of fillers other than non-swellable mica include swellable mica, talc, clay, barium sulfate, calcium carbonate, magnesium carbonate, glass, silica, aluminum oxide, aluminum, aluminum hydroxide, iron, titanium oxide, and iron oxide. , Diatomaceous earth, zeolite, ferrite and the like.

  Anti-vibration coating compositions for roofs require flame retardants, colorants, antioxidants, antistatic agents, stabilizers, foaming agents, lubricants, dispersants, gelling agents, film-forming aids, antifreeze agents, etc. It can be contained according to.

  The vibration-damping coating composition for roof can be prepared by mixing an aqueous resin dispersion and non-swelling mica using a known mixing means. And a coating film is formed in a roofing material by drying, after applying the damping paint composition for roofs to the predetermined part of a roofing material. As a coating method, a known coating device such as a roll coater or a spray gun can be used. Examples of the method for drying the paint include hot air drying and infrared drying. In such application, the anti-swelling mica having the above-described average particle diameter and aspect ratio is blended in the vibration-damping coating composition for roofs, so that it adheres to the roll coater particularly when applied with a roll coater. As a result of the composition being easily transferred to the roofing material, problems such as coating unevenness and fading are unlikely to occur. That is, good applicability is exhibited.

Next, the roof structure to which the vibration-damping coating composition for roof is applied will be described.
As shown in FIG. 1, the roof structure has a configuration in which a coating film 12 is laminated on a metal roof material 11. As a metal which comprises the roofing material 11, steel, stainless steel, an aluminum alloy, a zinc alloy, copper, titanium etc. are mentioned, for example. The roof material 11 may be plated with various metals. The metal roof having the above-described roof structure is formed by a method such as a folded plate, a tile rod, a vertical flat, a flat plane, a horizontal plane, or a metal tile. The coating film 12 is laminated on the back surface of the roofing material 11 when the surface of the roofing material 11 exposed to rain is the front surface.

  The building having the above-described roof structure is not particularly limited, and examples include a warehouse, a factory, a parking lot, a bicycle parking lot, a gymnasium, an arcade, a temple, a shrine, and a general house. The metal roofing material 11 is advantageous in that the weight of the roof can be reduced as compared with a roofing material such as clay tile. Moreover, the rain sound generated by the metal roofing material 11 can become noise in the vicinity of the building in addition to noise in the lower part of the roofing material 11 (for example, inside the building). That is, since the roof material 11 vibrates when raindrops collide with the roof material 11 during rainfall, noise can be generated around the roof material 11. For this reason, for example, the above-described roof structure is advantageous in that noise is suppressed in the vicinity of a building having a metal roof in an area where houses are densely packed, an area where parking lots and houses are densely packed, or the like.

Here, since the non-swellable mica described above is dispersed in the coating film 12 of the present embodiment, the rain noise reduction effect is easily exhibited even when the occurrence of cracks is suppressed during drying.
In addition, the thickness of a coating film becomes like this. Preferably they are 10 micrometers-900 micrometers, More preferably, they are 10 micrometers-500 micrometers. By making the thickness of the coating film 10 μm or more, excellent vibration damping performance is easily exhibited, so that an excellent rain noise reduction effect is easily obtained. On the other hand, when the thickness of a coating film exceeds 900 micrometers, there exists a possibility of becoming the hindrance of the weight reduction of an applied material.

The effects exhibited by this embodiment will be described below.
(1) The roof vibration-damping coating composition contains an aqueous resin dispersion in which resin particles forming a coating film are dispersed in an aqueous dispersion medium, and non-swellable mica. Since the average particle diameter of non-swellable mica is 1 to 50 μm and the aspect ratio of non-swellable mica is 30 to 50, it is possible to maintain the effect of reducing rain noise and enhance the effect of suppressing the occurrence of armpits. It becomes like this. Therefore, it is possible to provide a vibration-damping coating composition for a roof that can maintain the rain noise reduction effect and can easily suppress the occurrence of a crack.

  (2) By including acrylic resin particles as the resin particles, it is easy to adjust the temperature range where the vibration damping performance is exhibited to near room temperature, so that the rain noise reduction effect can be exhibited near room temperature. Can do. Therefore, it is possible to provide a vibration-damping coating composition for roofs that can easily exhibit a rain noise reduction effect in a rainy environment.

(3) In a roof structure in which a coating film formed from a vibration-damping coating composition for roof is formed on a metal roof material, it is easy to maintain the rain noise reduction effect and suppress the occurrence of armpits.
The embodiment may be modified as follows.

A metal foil such as an aluminum foil may be bonded to the surface of the coating film 12 laminated on the roof material 11. In this case, a constrained vibration damping structure using a metal foil as a constraining layer can be configured.
The vibration damping coating composition for roof may be applied to the entire surface of the roof material 11 or may be partially applied to the surface of the roof material 11.

Next, the technical idea that can be grasped from the above embodiment will be described below.
-The vibration-damping coating composition for roofs apply | coated to the said metal roof material with a roll coater.
A method for manufacturing a roof structure in which a coating film is laminated on a metal roof material, the composition applied after applying the vibration-damping coating composition for roof to the metal roof material with a roll coater The manufacturing method of the roof structure which dries a thing. In this case, since the said vibration-damping coating composition for roofs has favorable applicability | paintability with respect to metal roofing materials, it is easy to raise the manufacturing efficiency of a roof structure.

Next, the embodiment will be described more specifically with reference to examples and comparative examples.
(Examples 1 and 2)
As shown in Table 1, non-swelling mica A, water and other ingredients were blended into an acrylic emulsion (Dainippon Ink and Chemicals, BC-280) as an aqueous resin dispersion, and stirred by a stirrer. The anti-vibration coating composition for roofs was prepared by mixing. 100 parts by mass of the acrylic emulsion contains 50 parts by mass of resin particles. The resin particles are a copolymer of methyl methacrylate and butyl acrylate, and the mass ratio of methyl methacrylate to butyl acrylate in the copolymer is 55:45. Other components are a dispersant, an antifreezing agent, a thickener, an antifoaming agent, and the like.

(Comparative Examples 1-3)
In each comparative example, as shown in Table 1, the non-swellable mica A was changed to non-swellable mica B to C having different average particle diameters or aspect ratios, as in Example 1, for roofing. A vibration-damping coating composition was prepared.

＜塗布性の評価＞
各例の屋根用制振塗料組成物を粘度カップＮｏ．２にて測定し、４０〜１００秒になるように水で希釈した希釈組成物を調製した。希釈組成物をウレタンローラーの全面に塗り付けた後、そのウレタンローラーをＳＰＣＣ鋼板上で５回往復させることでＳＰＣＣ鋼板に希釈組成物を塗布した。塗布した直後の塗膜を目視で観察し、表２に示される判定基準で評価した。その結果を表１に併記している。

<Evaluation of coatability>
The anti-vibration coating composition for roofs of each example was used as a viscosity cup No. The diluted composition diluted with water was measured so that it might become 40 to 100 seconds as measured by 2. After the diluted composition was applied to the entire surface of the urethane roller, the diluted composition was applied to the SPCC steel sheet by reciprocating the urethane roller five times on the SPCC steel sheet. The coated film immediately after coating was visually observed and evaluated according to the criteria shown in Table 2. The results are also shown in Table 1.

<Confirmation of suppression effect of armpit>
After applying the anti-vibration coating composition for roof of each example to a 5 mm thick SPCC steel plate with a bar coater, the SPCC steel plate was placed in a heating furnace and the anti-vibration coating composition was heated and dried to form a coating film. . In this heat drying, the temperature in the heating furnace was set so that the surface temperature of the SPCC steel sheet was 220 ° C., and the treatment was performed at that temperature for 40 seconds. In addition, the application amount of the anti-vibration coating composition for roof in each example is adjusted so that the thickness of the coating film is about 70 μm. Next, the surface state of the coating film was observed and evaluated according to the criteria shown in Table 2. The results are also shown in Table 1.

<Confirmation of rain noise reduction effect>
After applying the anti-vibration coating composition for roofs of each example to one side of the SPCC steel plate using a spray gun, the specimens of each example were prepared by drying at room temperature for 30 minutes. In addition, the coating amount of the anti-vibration coating composition for roof in each example was adjusted so that the thickness after drying was constant. About each test piece, the outdoor sound and the indoor sound were measured simultaneously using the rain sound test apparatus shown in FIG. The rain sound test apparatus is provided in a box-shaped apparatus main body 21, a rain section 22 provided above the apparatus main body 21, an outdoor sound microphone 23 provided outside the apparatus main body 21, and the apparatus main body. And an indoor sound microphone 24. A test body 31 is arranged on the upper part of the apparatus main body 21 so that the surface of the SPCC steel plate faces the rain part 22. Each microphone 23, 24 is connected to a sound level meter. The measurement condition is background noise of 39.3 dB, and rainfall is made constant from the rainfall section 22 to the surface of the SPCC steel sheet. The measurement of the outdoor sound and the indoor sound was repeated five times, and the average value of the measured values was calculated. Based on the measured outdoor sound and room sound, evaluation was performed according to the criteria shown in Table 2. The results are also shown in Table 1.

表１に示されるように、各実施例では、雨音低減効果及びワキの抑制効果のいずれも良好な結果が得られている。これに対して、各比較例では、非膨潤性マイカの平均粒径及びアスペクト比の少なくとも一方が上述した範囲外であるため、ワキの抑制効果について各実施例よりも劣っていることが分かる。また、各実施例では、塗布性についても各比較例よりも優れる結果が得られている。

As shown in Table 1, in each example, good results were obtained in both the rain noise reduction effect and the suppression effect of the armpit. On the other hand, in each comparative example, since at least one of the average particle diameter and the aspect ratio of the non-swellable mica is outside the above-described range, it can be seen that the suppression effect of the armpit is inferior to each of the examples. Moreover, in each Example, the result which is excellent also about applicability | paintability than each comparative example is obtained.

  11 ... Roofing material, 12 ... Paint film.

Claims (3)

A vibration-damping coating composition for roofs, which comprises an aqueous resin dispersion in which resin particles forming a coating film are dispersed in an aqueous dispersion medium, and non-swellable mica, and is applied to a metal roofing material. ,
The non-swellable mica has an average particle size of 1 to 50 μm, and the non-swellable mica has an aspect ratio of 30 to 50. The anti-vibration coating composition for roof according to claim 1, wherein acrylic resin particles are included as the resin particles. A roof structure, wherein a coating film formed from the vibration-damping coating composition for roof according to claim 1 or 2 is laminated on a metal roof material.

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