JP5113606B2 - Damping paint composition for roof and roof structure - Google Patents

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

  Although metal roofing materials can reduce the weight of the roof as compared with roofing materials such as clay tiles, the temperature tends to change easily due to the environmental temperature or the like. In the coating film formed by applying the vibration-damping coating composition for roof to such a metal roof material, the temperature easily changes due to the temperature of the roof material being transmitted. For example, the temperature of the roofing material changes depending on the season. For this reason, when the temperature dependence in the damping performance of the coating film is relatively large, the rain noise reduction effect is hardly exhibited.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a roof vibration-damping coating composition and a roof structure that can easily exhibit the effect of reducing rain noise even when the temperature of the roofing material changes. There is.

  In order to achieve the above object, the 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 the coating film. A roof vibration-damping coating composition comprising mica for improving vibration damping properties and applied to a metal roofing material, wherein the resin particles are co-polymerized with methyl methacrylate and butyl acrylate. It is formed from a coalescence, and the summary is that the mica contains swellable mica and further contains trioctylmethylammonium ion.

  The invention according to claim 2 is the vibration-damping coating composition for roof according to claim 1, wherein the content of the swellable mica is in the range of 10 to 300 parts by mass with respect to 100 parts by mass of the resin particles. This is the gist.

  The invention according to claim 3 is the vibration-damping coating composition for roof according to claim 1 or 2, wherein the content of the trioctylmethylammonium ion is 10 masses per 100 mass parts of the swellable mica. The gist is that it is in the range of more than part.

  The roof structure of the invention according to claim 4 is formed by laminating a coating film formed from the vibration-damping paint composition for roof according to any one of claims 1 to 3 on a metal roofing material. It becomes the summary.

  According to the present invention, even if the temperature of the roofing material changes, the effect of reducing rain noise is easily exhibited.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.
The vibration-damping coating composition for roof according to the present embodiment contains an aqueous resin dispersion in which resin particles that form a coating film are dispersed in an aqueous dispersion medium, and mica for improving the damping properties of the coating film. Yes. The resin particles forming the coating film are formed from a copolymer of methyl methacrylate and butyl acrylate. The mica contains swellable mica. The vibration-damping coating composition for roof further contains trioctylmethylammonium ion. By applying the vibration-damping coating composition for a roof to a metal roof material, rain sound generated by the vibration of the roof material during rainfall is reduced.

  By forming the resin particles from a copolymer of methyl methacrylate and butyl acrylate, the temperature range in which the vibration damping performance of the coating film is exhibited is adjusted to the temperature range of the roofing material. The resin particles are formed from a copolymer having a mass ratio (A / B) of, for example, 1/3 to 3/1 of mass (A) of methyl methacrylate and mass (B) of butyl acrylate. Is preferred. 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. The aqueous resin dispersion can be obtained according to a known method such as emulsion polymerization in which a monomer and a polymerization initiator are dropped into an aqueous solution containing an emulsifier.

  Mica is contained in order to improve the vibration damping performance of the coating film. The mica includes at least swellable mica. Swellable mica increases the effect of reducing rain noise within the temperature range of the roofing material by being contained together with trioctylmethylammonium ions. Swellable mica is a mica that has the property of swelling with a polar solvent such as water. The ions existing between the layers of the swellable mica are lithium, sodium, or strontium, and the swellable mica swells by ion exchange with ions in the polar solvent. Examples of the swellable mica include Na type tetrasilicic fluorine mica, Li type tetrasilicic fluorine mica, Na type fluorine teniolite, Li type fluorine teniolite, and the like. As swellable mica, organically modified mica in which ions existing between layers of swellable mica and trioctylmethylammonium ions are ion-exchanged can also be contained. By blending organic modified mica into the aqueous resin dispersion, trioctylmethylammonium ions can be simultaneously contained in the vibration-damping coating composition for roof together with swellable mica. In addition to the swelling mica, the vibration-damping coating composition for roof can contain non-swelling mica.

  The content of the swellable mica in the vibration-damping coating composition for roof is preferably 10 to 300 parts by mass, more preferably 20 to 250 parts by mass with respect to 100 parts by mass of the resin particles. When the content of the swellable mica in the vibration-damping coating composition for roof is less than 10 parts by mass with respect to 100 parts by mass of the resin particles, it is difficult to remarkably enhance the rain noise reduction effect. On the other hand, when the content of the swellable mica in the vibration-damping coating composition for roof exceeds 300 parts by mass with respect to 100 parts by mass of the resin particles, the moldability of the coating film may be deteriorated.

  By containing trioctylmethylammonium ion together with swellable mica, the effect of reducing rain noise is enhanced in the temperature range of the roofing material. In blending trioctylmethylammonium ion into the aqueous resin dispersion, it can be blended as a trioctylmethylammonium salt such as trioctylmethylammonium chloride. The content of trioctylmethylammonium ion is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, and further preferably 30 parts by mass or more with respect to 100 parts by mass of the swellable mica. When the content of trioctylmethylammonium ion is less than 10 parts by mass with respect to 100 parts by mass of swellable mica, it is difficult to significantly increase the rain noise reduction effect in the temperature range of the roofing material. The content of trioctylmethylammonium ion is preferably 100 parts by mass or less with respect to 100 parts by mass of swellable mica, from the viewpoint of maintaining good moldability of the coating film.

  For example, a vibration damping component, a filler, a flame retardant, a colorant, an antioxidant, an antistatic agent, a stabilizer, a foaming agent, a lubricant and the like may be added to the vibration damping coating composition for roofs as necessary. it can. Examples of the vibration damping component include at least one compound selected from a benzothiazyl compound, a benzotriazole compound, a diphenyl acrylate compound, a normal phosphate ester compound, and an aromatic secondary amine compound. Examples of the filler include calcium carbonate, talc, clay, barium sulfate, magnesium carbonate, glass, silica, aluminum oxide, aluminum, aluminum hydroxide, iron, titanium oxide, iron oxide, diatomaceous earth, zeolite, and ferrite.

  The vibration-damping coating composition for roof can be prepared by mixing an aqueous resin dispersion, swellable mica, trioctylmethylammonium salt, and the like 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. The rain noise reduction effect of the vibration-damping coating composition for roofs is shown by the loss coefficient of the coating film and its temperature dependence. That is, it is shown that the higher the loss coefficient of the coating film, the better the rain noise reduction effect. Furthermore, the smaller the variation of the loss factor in the temperature range of the environment where the coating film is used, the lower the temperature dependency of the rain noise reduction effect. The loss factor can be measured by a known central excitation method loss factor measuring device.

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, in the area where houses are densely packed, the area where parking lots and houses are crowded, etc., the above roof structure is advantageous in that noise is suppressed in the vicinity of the building including the roofing material 11.

  Here, the metal roofing material 11 tends to change easily due to the environmental temperature or the like. Such a temperature change of the roofing material 11 changes the temperature of the coating film 12. In this regard, the vibration-damping coating composition for roof according to this embodiment contains the resin particles, swellable mica, and trioctylmethylammonium ions. For this reason, as a result of increasing the affinity of the swellable mica for the copolymer of methyl methacrylate and butyl acrylate, the adhesion between the copolymer and the swellable mica decreases even if the temperature of the coating film 12 changes. I guess it will be difficult. Thereby, it can be estimated that the temperature dependence of the vibration damping performance of the coating film 12 is reduced. That is, even if the coating film 12 changes in temperature as the temperature of the roofing material 11 changes, the vibration damping performance of the coating film 12 is unlikely to decrease.

The effects exhibited by this embodiment will be described below.
(1) The vibration-damping coating composition for roof contains the resin particles, swellable mica, and trioctylmethylammonium ion. For this reason, even if the coating film 12 changes in temperature as the temperature of the roofing material 11 changes, the vibration damping performance of the coating film 12 is unlikely to decrease. Therefore, according to the vibration-damping paint composition for roofs of this embodiment, it becomes easy to reduce rain sound even if the temperature of the roofing material 11 changes.

  (2) The content of the swellable mica is preferably in the range of 10 to 300 parts by mass with respect to 100 parts by mass of the resin particles. Thereby, it becomes easy to maintain the moldability of the coating film 12 suitably, and to remarkably improve the rain noise reduction effect.

  (3) The content of trioctylmethylammonium ions is preferably in the range of 10 parts by mass or more with respect to 100 parts by mass of swellable mica. Thereby, it becomes easy to remarkably enhance the effect of reducing rain noise in the temperature range of the roofing material 11.

  (4) If the roofing material 11 is less than 0 ° C., for example, it is highly likely that snow will be observed instead of rain. That is, for example, noise due to rain sound is generated in a range of 0 ° C. or higher. Therefore, it is preferable to configure the coating film 12 so that the value of the loss coefficient becomes the highest in the temperature range. In this respect, the resin particles are formed from a copolymer having a mass ratio (A / B) of 1/3 to 3/1 of mass (A) of methyl methacrylate and mass (B) of butyl acrylate. Thus, it becomes easy to adjust the temperature at which the value of the loss coefficient becomes the highest, for example, in a range of 0 ° C. or more. That is, it becomes easy to adjust the temperature range in which rain noise can be suitably reduced. As a result, it is possible to provide a vibration-damping coating composition for roofs that is excellent in the effect of reducing rain noise.

  (5) The roof structure of this embodiment has a configuration in which a coating film 12 is laminated on a metal roofing material 11. According to such a roof structure, as described in the above section (1), it is easy to reduce rain sound even if the temperature of the roofing material 11 changes.

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 above-mentioned swellable mica and trioctylmethylammonium ions are a vibration-damping coating composition for roofs that is formulated as organically modified mica in which ions existing between layers of swellable mica and trioctylmethylammonium ions are exchanged.

  The resin particles are formed from a copolymer having a mass ratio (A / B) of 1/3 to 3/1 of the mass of the methyl methacrylate (A) and the mass of the butyl acrylate (B). Damping paint composition for roof.

Next, the embodiment will be described more specifically with reference to examples and comparative examples.
Example 1
By blending 100 parts by mass of organically modified mica (manufactured by Coop Chemical Co., Ltd., MTE) with 100 parts by mass of acrylic emulsion (Dainippon Ink & Chemicals, BC-280) and mixing with an agitator A vibration-damping coating composition for roof was prepared. 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. The organically modified mica is obtained by ion exchange of interlayer ions of swellable mica with trioctylmethylammonium ions, and the organically modified mica contains about 31% by mass of organic matter. In addition, a dispersing agent etc. are mix | blended with the predetermined | prescribed mixture ratio in the vibration-damping coating composition for roofs.

(Comparative Example 1)
In Comparative Example 1, a roof vibration-damping coating composition was prepared in the same manner as in Example 1 except that the organically modified mica was changed to swellable mica (manufactured by Co-op Chemical Co., Ltd., ME-100).
<Measurement of loss factor>
After applying the vibration-damping coating composition for roofs of each example to a steel plate (thickness 0.5 mm), a coating film was formed by heating and drying at 80 ° C. for 30 minutes, and these coating films were used as test pieces. In addition, the coating amount of the vibration-damping coating composition for roofs on the steel plate is adjusted so that the coating thickness after heating and drying is 0.5 mm. About the test piece of each example, the loss coefficient ((eta)) in -10 degreeC-60 degreeC was measured using the central vibration method loss factor measuring apparatus (CF5200 type, Ono Sokki Co., Ltd. product). FIG. 2 shows the relationship between temperature and loss factor. As apparent from the results of FIG. 2, in Comparative Example 1, the value of the loss factor sharply decreases when it exceeds 20 ° C., whereas the loss factor of Example 1 decreases in the loss factor in the range exceeding 20 ° C. It can be seen that is suppressed. Thereby, it turns out that the effect of reducing rain noise is easily exhibited in the vibration-damping coating composition for roof of Example 1 even if the temperature of the roofing material is changed.

The fragmentary sectional view which shows the roof structure of this embodiment. The graph which shows the relationship between temperature and a loss factor.

Explanation of symbols

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

Claims (4)

For roofing, which contains an aqueous resin dispersion in which resin particles forming a coating film are dispersed in an aqueous dispersion medium, and mica for improving the vibration damping properties of the coating film, and is applied to a metal roofing material. A vibration-damping coating composition comprising:
The resin particles are formed from a copolymer of methyl methacrylate and butyl acrylate, the mica contains swellable mica, and further contains trioctylmethylammonium ions. Composition. The content of the swellable mica is in the range of 10 to 300 parts by mass with respect to 100 parts by mass of the resin particles. 3. The vibration-damping coating composition for roof according to claim 1, wherein a content of the trioctylmethylammonium ion is in a range of 10 parts by mass or more with respect to 100 parts by mass of the swellable mica. . The roof structure characterized by the coating film formed from the damping coating composition for roofs as described in any one of Claims 1-3 being laminated | stacked on metal roofing materials.

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