JP2011214271A - Composition of vibration damping paint for roof member and roof member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition of a vibration damping paint for a roof member which can effectively suppress the occurrence of boil in the process of the drying of a coating on a metal roof member when the vibration damping paint is applied to a metal roof member and can form a vibration damping coating having a sufficient rain noise reduction effect in a wide temperature range, and also provide a roof structure.SOLUTION: This composition of a vibration damping paint for a roof member which is applied to the metal roof member 11 includes a water-based resin dispersed liquid in which resin particles are dispersed in a water-based dispersion medium, a potassium titanate the average particle diameter of which is 1-50 μm and the aspect ratio of which is 100-200, and a non-swelling mica. The mixing ratio of the non-swelling mica and the potassium titanate is 98/2-92/8 in weight ratio.

Description

  The present invention relates to a vibration-damping coating composition for a roof material and a roof capable of forming a vibration-damping coating film on the surface of a metal roof material that is frequently used as a roof material in, for example, factories, warehouses, parking lots, and general houses. Regarding materials. Specifically, when applied to a metal roofing material, it is possible to effectively suppress the occurrence of cracks during the drying process of the coating film, and to have a sufficient rain noise reduction effect in a wide temperature range. The present invention relates to a vibration-damping coating composition for a roof material and a roof material that can form a film.

   Conventionally, for example, roof materials for factories, warehouses, parking lots, general houses, and the like, metal roof materials that are lighter and have better handling properties have been frequently used in place of tile roofs that are heavy and have poor handling properties. However, in the case of a metal roofing material, the rain sound generated when rainwater hits the metal roofing material propagates into the building through the roofing material and becomes noise, and the rain generated by hitting the roofing material. The sound may be transmitted to neighboring neighbors and become noise. In particular, during the rainy season in June and July, the rainy days continue for a long time, and there is a risk of developing complaints about nearby noise and vibration.

  Conventionally, for noise caused by rain sound in metal roofing materials, the roofing material and the base material are bonded using a vibration-damping adhesive, or a damping sheet is attached to the back side of the folded plate (See, for example, Patent Documents 1 and 2).

  In addition, for example, a countermeasure has been taken in which a synthetic emulsion paint containing 5 to 30% by mass of a scaly pigment is applied to the surface of the roofing material to form a vibration-damping coating on the surface of the roofing material (for example, a patent). Reference 3).

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

  However, in conventional noise countermeasures using rain-damping adhesives, damping sheets, or damping paints, as the drying temperature is increased, the surface appearance of the coating film becomes uneven or the coating is applied. A phenomenon that pinholes are easily formed in the curtain is likely to occur, and this phenomenon is generally referred to as an armpit and is a defect on the surface of the coating film. Therefore, suppression of the occurrence has been desired. Moreover, the rain noise reduction effect of conventional vibration-damping adhesives, vibration-damping sheets or vibration-damping paints is limited to a very narrow temperature range. In some cases, the effect of reducing the rain noise could not be obtained.

  In view of such technical problems in this field, the present inventor is for roofing materials that can effectively suppress the occurrence of armpits and can form a vibration-damping coating film having a sufficient rain noise reduction effect in a wide temperature range. As a result of diligent research to propose a vibration-damping coating composition, when a coating composition containing potassium titanate and non-swelling mica in a certain ratio is applied to the surface of a metal roofing material, the coating film is dried. Based on this knowledge, we discovered that it is possible to effectively suppress the occurrence of cracks in the process and to form a vibration-damping coating film that exhibits a sufficient rain noise reduction effect in a wide temperature range. The invention has been completed.

  That is, according to the present invention, when applied to a metal roofing material, it is possible to effectively suppress the occurrence of cracks in the drying process of the coating film, and to have a sufficient rain noise reduction effect in a wide temperature range. An object of the present invention is to provide a vibration-damping coating composition for a roof material and a roof material that can form a vibration coating film.

In order to achieve the above object, the invention according to claim 1 is a vibration-damping coating composition for roofing material applied to a metal roofing material,
An aqueous resin dispersion in which resin particles are dispersed in an aqueous dispersion medium;
Potassium titanate having an average particle size of 1 to 50 μm and an aspect ratio of 100 to 200;
Non-swelling mica,
The gist of the anti-vibration coating composition for roofing materials is characterized in that the mixing ratio of the non-swellable mica and potassium titanate is 98/2 to 92/8 in mass ratio.

  The invention according to claim 2 is characterized in that the potassium titanate is contained in a proportion of 3 to 15 parts by mass with respect to 100 parts by mass of the resin particles. The object was the gist.

  The gist of the invention according to claim 3 is the vibration-damping coating composition for roofing material according to claim 1, wherein the resin particles are acrylic resin particles.

  The invention according to claim 4 is a roofing material characterized in that a coating film is formed on the surface of a metal roofing material by the roofing material damping coating composition according to any one of claims 1 to 3. The summary was taken.

  In the damping coating composition for roofing materials of Claims 1-3, the water-system resin dispersion liquid which disperse | distributed the resin particle to the water-system dispersion medium, an average particle diameter is 1-50 micrometers, and an aspect-ratio is 100. ~ 200 potassium titanate and non-swellable mica, and the blending ratio of the non-swellable mica and potassium titanate is 98/2 to 92/8 in weight ratio, When the vibration-damping coating composition for roofing material is applied to a metal roofing material, it is possible to effectively suppress the occurrence of cracks during the drying process of the coating film, and it is formed into a metal roofing material. The coating film has a sufficient effect of reducing rain noise over a wide temperature range, and even if the temperature of the roof material surface fluctuates greatly, it can reliably reduce rain noise, which is extremely effective for noise and vibration countermeasures. is there.

  Moreover, in the roofing material of Claim 4, using the damping material composition for roofing materials in any one of Claims 1-3, this is apply | coated to the metal roofing material surface, and the above-mentioned. Since the vibration-damping coating film having the above effect is formed on the roof material surface, a roof structure capable of effectively suppressing noise due to rain sound can be created by using the roof material.

The fragmentary sectional view which shows the roof structure of this embodiment. The graph which shows the relationship between the temperature of a coating film, and a loss coefficient when each coating composition of Examples 1-3 and Comparative Examples 1 and 2 is apply | coated to metal roofing materials.

  Hereinafter, the coating composition for roof materials and the roof material of the present invention will be described in more detail. First, the coating composition for roofing material of the present invention (hereinafter simply referred to as a coating composition) will be described. The coating composition of the present invention is applied to, for example, a metal roof material constituting a roof structure of a building such as a warehouse, factory, parking lot, bicycle parking lot, gymnasium, arcade, temple, shrine, general house, etc. As shown in the figure, the surface of the roofing material 11 has an excellent rain noise reduction effect, and forms a vibration-damping coating film 12 having good coating properties and adhesion.

  Examples of the metal constituting the roof material include iron, stainless steel, aluminum alloy, zinc alloy, and copper. The roof material may be plated with various metals. The coating composition of the present invention applied to the surface of these metal roofing materials includes an aqueous resin dispersion in which resin particles forming a coating film are dispersed in an aqueous dispersion medium, and a coating film formed on the surface of the roofing material. In addition, potassium titanate having an average particle diameter of 1 to 50 μm and an aspect ratio of 100 to 200, and a non-swelling mica, which are components for improving the vibration damping property of the resin, are included.

  Examples of resin particles that form the coating film include acrylic resins, acrylic / styrene resins, urethane resins, phenol resins, vinyl chloride resins, vinyl acetate resins, vinyl acetate / acrylic resins, ethylene / vinyl acetate. Examples thereof include a resin selected from a resin, an epoxy resin, a polyester resin, an alkyd resin, an acrylonitrile / butadiene copolymer rubber, a butadiene rubber and an isoprene rubber, or a modification thereof. As the resin particles forming the coating film, those composed of any one of the above-mentioned resins, rubbers and modified materials, or those composed of two or more types can be used.

  Among the resin particles, those made of an acrylic resin are preferable in that the peak temperature region in which the vibration damping performance is most exerted is easily adjusted to around room temperature of 0 to 50 ° C. Examples of the acrylic resin include acrylic monomers such as acrylic acid, methyl ester, ethyl ester, propyl ester, and butyl ester, and methacrylic acid monomers such as methacrylic acid, 2-ethylhexyl ester, and ethoxyethyl ester. A homopolymer, a mixture of these homopolymers, or a copolymer in which a plurality of the monomers are polymerized can be exemplified. Among the acrylic resins, acrylic acid esters, methacrylic acid esters, or copolymers of methyl methacrylate and butyl acrylate are more preferable because they are easily adjusted to around room temperature.

  When resin particles made of an acrylic resin are used as resin particles forming a coating film, it is most preferable to use the resin particles made of an acrylic resin alone, but the resin particles forming the coating film are made of another resin. When resin particles are also used in combination, the content of the resin particles made of an acrylic resin with respect to the total amount of the resin particles is preferably 90% by mass or more, and more preferably 95% by mass or more.

  As the aqueous dispersion medium for dispersing the resin particles, water or a mixed liquid of water and a monohydric alcohol is preferable, and preferable examples of the monohydric alcohol include methanol and ethanol.

  The resin particles and the aqueous dispersion medium forming the coating film are made of a metal such as iron, zinc, aluminum, copper, etc. constituting the roof material to which the coating composition of the present invention is applied or the plating film formed on the surface thereof. It is desirable to select the type appropriately, considering the type and shape of the roofing material.

  Potassium titanate cooperates with the non-swellable mica described later to effectively suppress the occurrence of cracks during the coating drying process, improve the vibration damping performance, and effectively reduce rain noise. It is a functional ingredient. The average particle diameter is 1 to 50 μm, and the aspect ratio is 100 to 200. When the average particle size is less than 1 μm, the adjustment of the aspect ratio may be difficult, and when the average particle size exceeds 50 μm, the coatability may be reduced. Moreover, when the aspect ratio of potassium titanate is less than 100, the effect of reducing rain noise cannot be obtained sufficiently, and when the aspect ratio exceeds 200, there is a risk of causing a problem that applicability deteriorates.

  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 randomly selecting 50 potassium titanates and measuring the major axis and thickness of the potassium titanates in the observation with a scanning electron microscope.

  Examples of potassium titanate that can be used include scale-like or fibrous potassium 6-titanate, potassium 4-titanate, and potassium potassium titanate. These potassium titanates can be used alone or A plurality of types can be used in combination.

  As content of potassium titanate, the range of 3-15 mass parts is preferable with respect to 100 mass parts of resin particles in this coating composition. When the content of potassium titanate is less than 3 parts by mass, a sufficient effect of suppressing the occurrence of cracking and a rain sound attenuation effect cannot be obtained, and the content of potassium titanate is 15 parts by mass with respect to 100 parts by mass of the resin particles. When exceeding, there exists a possibility that the applicability | paintability with respect to metal roofing materials of this coating composition may be impaired.

  Non-swelling mica cooperates with the above-mentioned potassium titanate to effectively suppress the occurrence of cracks during the drying process of the coating film, improve the vibration damping performance, and effectively reduce rain noise. It is a component having a function, and such an effect can be obtained by setting the mixing ratio of non-swellable mica and potassium titanate to a range of 98/2 to 92/8 in terms of mass ratio. If the blending ratio of both components is out of the above range, it is not possible to obtain a sufficient effect of suppressing the occurrence of cracks in the coating film and reducing rain noise when the coating composition is applied to the roofing material. There is a risk that problems such as loss of applicability and an increase in the thickness of the coating film may occur. Examples of the non-swellable mica that can be used include mascobite and phlogopite.

  Moreover, the coating composition of this invention can also be made to contain fillers other than potassium titanate and non-swelling mica as needed. As fillers other than potassium titanate and non-swellable mica, for example, swellable mica, talc, clay, barium sulfate, calcium carbonate, magnesium carbonate, glass, silica, aluminum oxide, aluminum, aluminum hydroxide, iron, titanium oxide , Iron oxide, diatomaceous earth, zeolite, ferrite, graphite, sepiolite and the like.

  In addition, the kind of potassium titanate and non-swellable mica, the content and the blending ratio are the kind of metal such as iron, zinc, aluminum and copper constituting the plating material formed on the roofing material or the surface thereof, or the roofing material. It is desirable to determine appropriately depending on the type and shape of the material, as well as the required damping properties.

  The coating composition of the present invention includes a flame retardant, a colorant, an antioxidant, an antistatic agent, a stabilizer, a foaming agent, a lubricant, a dispersant, a gelling agent, a film-forming aid, an antifreezing agent, and an antirust. An agent or the like can be contained as necessary.

  The coating composition of the present invention can be prepared by blending the above-mentioned potassium titanate and non-swellable mica into the aqueous resin dispersion and mixing them using a conventionally known mixing means such as a planetary mixer. .

  The coating method for applying the coating composition of the present invention to the roofing material is not particularly limited, and for example, a coating means such as a roll coater or a spray gun can be used. Drying of the coating includes hot air drying and infrared drying. The method can be taken. When the coating composition is applied to a roofing material, the composition contains the above-mentioned potassium titanate and non-swellable mica, so that coating unevenness and rubbing hardly occur. Occurrence is effectively suppressed.

  Although it does not specifically limit as an application quantity to the roofing material of the coating composition of this invention, The kind of metal, such as iron, zinc, aluminum, copper which comprises the roofing material or the plating film formed in the surface, or a roofing material It may be determined appropriately in consideration of the type and shape of the material, and the required vibration damping properties.

  Specifically, it is desirable that the coating amount formed on the surface of the roofing material has a dry coating thickness so that the coating amount is 10 μm to 900 μm. More preferably, the dry film thickness of the coating film is 10 μm to 500 μm. When the coating amount of the coating composition on the roofing material (the dry film thickness of the coating film) is less than 10 μm, the coating film cannot obtain a sufficient rain noise reduction effect and has poor durability. . On the other hand, when the coating amount of the coating composition on the roofing material (the dry film thickness of the coating film) exceeds 900 μm, the coating film tends to peel from the surface of the roofing material, and there is a risk that sufficient adhesion cannot be secured. is there.

  In addition, the coating composition can be applied to the roof material in addition to the form in which the coating composition is applied to the entire surface of the roof material. In that case, the amount of the coating composition used can be suppressed, and the cost and weight can be reduced.

  Next, the roofing material of the present invention will be described. As shown in FIG. 1, the roofing material of the present invention has a structure in which a vibration-damping coating film 12 derived from the coating composition of the present invention is formed on the surface of a metal roofing material 11. For this reason, the roofing material of the present invention is not only lightweight, but also has an excellent rain noise reduction effect, and since the vibration-damping coating film 12 is smooth and non-uniform, there is little risk of peeling, etc. The reduction effect is hardly impaired.

  The roofing material of the present invention can be used for the roofs of many buildings such as ordinary houses, schools, gymnasiums, leisure facilities, factories, warehouses, stores, garages, arcades, etc. It can be applied to various roof construction methods such as plates, flatbeds, side walls, or metal tiles.

  The roofing material of the present invention can take an aspect in which after a vibration-damping coating film is formed on the top surface of the roofing material, a metal foil such as an aluminum foil is further bonded to the top surface. In this case, a constraining type vibration damping structure using a metal foil as a constraining layer is created on the top surface of the roof material, and the rain noise reducing effect of the coating film is further improved.

  It is a copolymer of methyl methacrylate and 2-ethylhexyl acrylate in an acrylic emulsion (manufactured by DIC Corporation, BC-280), and the mass of methyl methacrylate and 2-ethylhexyl acrylate in the copolymer A resin particle having a ratio of 37:63, potassium titanate having an average particle diameter of 18 μm and an aspect ratio of 150 and non-swellable mica (manufactured by Yamaguchi Mica Co., Ltd., TM-20) are blended in a weight ratio shown in Table 1. The coating compositions of Examples 1 to 3 and Comparative Examples 1 and 2 were prepared. About each obtained coating composition of Examples 1-3 and Comparative Examples 1 and 2, evaluation of loss factor, applicability | paintability, and the suppression effect of a bran were confirmed, and the result is shown in Table 1 and FIG. It was.

<Evaluation of loss factor>
Each of the coating compositions of Examples 1 to 3 and Comparative Examples 1 and 2 was applied to a steel plate having a thickness of 1 mm so as to have a thickness of 1 mm, and dried at about 50 ° C. to form a vibration-damping coating film. This was used as a test piece. The loss factor of the vibration-damping coating film of each test piece was measured using a central vibration method loss factor measuring device (CF5200 type) manufactured by Ono Sokki Co., Ltd.

<Evaluation of coatability>
Each coating composition of Examples 1 to 3 and Comparative Examples 1 and 2 was measured with viscosity cup No. 2, and a diluted composition diluted with water was prepared so as to be 40 to 100 seconds. After the diluted composition was applied to the entire surface of the urethane roller, the diluted composition was applied to the galvalume steel plate by reciprocating the urethane roller five times on the galvalume steel plate. The coated film immediately after coating was visually observed and evaluated according to the criteria shown in Table 2.

<Confirmation of suppression effect of armpit>
After coating each coating composition of Examples 1 to 3 and Comparative Examples 1 and 2 on a 0.5 mm thick galvalume steel plate with a bar coater, the galvalume steel plate is placed in a heating furnace and the coating composition is heated and dried. A coating film was formed. In this heat drying, the temperature in the heating furnace was set so that the surface temperature of the Galvalume steel plate was 220 ° C., and the treatment was performed at that temperature for 40 seconds. In addition, the application quantity of each coating composition of Examples 1-3 and Comparative Examples 1 and 2 is adjusted so that the thickness of a coating film may be set to about 100 micrometers. Next, the surface state of the coating film was checked for presence or absence and evaluated based on the criteria shown in Table 2.

  From Table 1, in each coating composition of Comparative Examples 1 and 2, the applicability and the suppression effect of the armpit were evaluated as Δ and ×, but in each coating composition of Examples 1 to 3. In both cases, the evaluation was good, and it was confirmed that the coating property and the suppression effect of the armpit were excellent.

  Also, from FIG. 2, in the case of Comparative Examples 1 and 2, the temperature range in which the loss factor of the coating film exceeds 0.08 is about 10 to 20 ° C., whereas in the case of Examples 1 and 3, the coating film The temperature range in which the loss coefficient exceeds 0.08 is about 3 to 22 ° C., and in the case of Example 2, the temperature range in which the loss coefficient of the coating film exceeds 0.08 is about 3 to 25 ° C. and is wide. It was confirmed that excellent vibration damping performance was exhibited in the temperature range.

Claims (4)

A vibration-damping coating composition for roofing material applied to a metal roofing material,
An aqueous resin dispersion in which resin particles are dispersed in an aqueous dispersion medium;
Potassium titanate having an average particle size of 1 to 50 μm and an aspect ratio of 100 to 200;
Non-swelling mica,
The vibration-damping coating composition for roofing materials, wherein the blending ratio of the non-swellable mica and potassium titanate is 98/2 to 92/8 in mass ratio.   The vibration-damping coating composition for roofing materials according to claim 1, wherein potassium titanate is contained in a proportion of 3 to 15 parts by mass with respect to 100 parts by mass of the resin particles.   The vibration-damping coating composition for roofing materials according to claim 1, wherein the resin particles are acrylic resin particles.   The roofing material by which the coating film is formed in the metal roofing material surface with the damping coating composition for roofing materials in any one of Claims 1-3.

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