JP5567883B2 - Damping paint composition for roofing material and roofing material - Google Patents

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 metal roofing materials, it can effectively suppress the occurrence of cracks in the drying process of the coating film, and it can sufficiently reduce rain noise despite the low filler content. The present invention relates to a vibration-damping coating composition for a roof material and a roof material capable of forming a vibration-damping coating film having an effect.

   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.

  Further, in the conventional vibration damping adhesive, vibration damping sheet, or vibration damping paint, a large amount of a filler such as mica has been filled in order to ensure a sufficient rain noise reduction effect. For this reason, although it is a metal roof material that has the advantage of being lighter and easier to handle than conventional tiled roofs, it has added vibration damping properties, so it becomes heavier and easier to handle Invite a bug that damages.

  In view of such technical problems in the field, the present inventor effectively suppresses the occurrence of cracks and has a sufficient effect of reducing rain noise despite the low filler content. As a result of earnest research, it is possible to form a coating film having a sufficient rain noise reducing effect even if the content of potassium titanate is small. It has been discovered that the inclusion of potassium titanate can effectively suppress the occurrence of cracks during the drying process of the coating film, and the present invention has been completed based on this finding.

  That is, the present invention, when applied to a metal roofing material, can effectively suppress the occurrence of cracks in the drying process of the coating film, and can provide sufficient rain despite the low filler content. An object of the present invention is to provide a vibration-damping coating composition for a roof material and a roof material capable of forming a vibration-damping coating film having a sound reduction effect.

In order to achieve the above object, the invention according to claim 1 is a water-based roofing vibration-damping coating composition applied to a metal roofing material,
An aqueous resin dispersion in which acrylic resin particles made of an acrylic resin 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;
The potassium titanate is contained in a proportion of 20 to 65 parts by mass with respect to 100 parts by mass of the acrylic resin particles ,
The acrylic resin is a homopolymer composed of monomers of acrylic acid, acrylic acid ester, methacrylic acid, or methacrylic acid ester, or a copolymer formed by polymerizing a plurality of the monomers. The gist of the vibration-damping coating composition for roofing materials, characterized by being a coalescence .

The gist of the invention according to claim 2 is the roof material characterized in that a coating film is formed on the surface of the metal roof material by the vibration-damping coating composition for roof material according to claim 1 .

In the vibration-damping coating composition for a roofing material according to claim 1, an aqueous resin dispersion in which acrylic resin particles made of an acrylic resin are dispersed in an aqueous dispersion medium, and an average particle diameter is 1 to 50 μm. And potassium titanate having an aspect ratio of 100 to 200, and the potassium titanate is contained in a proportion of 20 to 65 parts by mass with respect to 100 parts by mass of the acrylic resin particles. When the vibration-damping coating composition for roofing material is applied to a metal roofing material, occurrence of cracks during the drying process of the coating film can be effectively suppressed.

In the vibration-damping coating composition for roofing material according to claim 1, the content of potassium titanate is a slight amount of 20 to 65 parts by mass with respect to 100 parts by mass of the acrylic resin particles. Nevertheless, it is possible to form a vibration-damping coating film having a sufficient rain noise reduction effect. For this reason, even if the vibration-damping coating composition for roofing material is applied to a metal roofing material and a vibration-damping coating film is formed on the roofing material, there is an advantage that it does not become heavy and the handling property is not impaired. doing.

In the roofing material according to claim 2, the content of potassium titanate in the vibration-damping coating film formed on the roofing material is 20 to 65 with respect to 100 parts by mass of the acrylic resin particles. The coating film has a sufficient effect of reducing rain noise in spite of the small amount of the mass part, so that it is lightweight and easy to handle. Moreover, when this roofing material is used, the noise by rain sound can be suppressed effectively and a lightweight roof structure can be created.

The fragmentary sectional view which shows the roof structure of this embodiment. The graph which shows the relationship between the loss coefficient of the coating film using the coating composition of Example 1, and temperature. The graph which shows the relationship between the loss coefficient of a coating film using the coating composition of Example 2, and temperature. The graph which shows the relationship between the loss coefficient of the coating film using the coating composition of Example 3, and temperature. The graph which shows the relationship between the loss factor of a coating film using the coating composition of the comparative example 1, and temperature. The graph which shows the relationship between the loss coefficient of the coating film using the coating composition of the comparative example 2, and temperature. The graph which shows the relationship between the loss coefficient of the coating film using the coating composition of the comparative example 3, and temperature.

  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. This is a component for improving the vibration damping property of the potassium titanate having an average particle diameter of 1 to 50 μm and an aspect ratio of 100 to 200.

  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 is a component having a function of effectively suppressing the occurrence of cracks during the drying process of the coating film, improving the vibration damping performance, and effectively reducing rain noise. 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, it may be difficult to adjust the aspect ratio, and when the average particle size exceeds 50 μm, the applicability may be lowered. In addition, 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 possibility of causing a problem that applicability is lowered.

  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.

  This potassium titanate is contained in the range of 20 to 65 parts by mass with respect to 100 parts by mass of the resin particles in the coating composition. When the content of potassium titanate is less than 20 parts by mass, a sufficient effect of suppressing the occurrence of cracking and a sufficient rain sound attenuation effect cannot be obtained, and the content of potassium titanate is 65 parts by mass with respect to 100 parts by mass of the resin particles. When it exceeds the part, applicability to the metal roofing material of the coating composition may be impaired.

  The type and content of potassium titanate are the type of metal such as iron, zinc, aluminum, copper, or the type or shape of the roofing material that constitutes the roofing material or the plating film formed on the surface thereof, as well as the requirements. It is desirable to determine appropriately considering the vibration damping performance.

  Moreover, the coating composition of this invention can also be made to contain fillers other than potassium titanate as needed. Examples of fillers other than potassium titanate include mica, talc, clay, barium sulfate, calcium carbonate, magnesium carbonate, glass, silica, aluminum oxide, aluminum, aluminum hydroxide, iron, titanium oxide, iron oxide, diatomaceous earth, and zeolite. , Ferrite, graphite, sepiolite and the like.

  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 this invention can be prepared by mix | blending the above-mentioned potassium titanate with the said aqueous resin dispersion, and mixing using conventionally well-known mixing means, such as a planetary mixer.

  The application method for applying the coating composition of the present invention to the roofing material is not particularly limited, and for example, an application means such as a roll coater or a spray gun can be used. Can be used. When the coating composition is applied to a roofing material, the composition contains the above-mentioned potassium titanate, so that coating unevenness and rubbing hardly occur, and generation of cracks is effective during drying. It is supposed to be suppressed.

  The coating amount of the coating composition of the present invention on the roofing material is not particularly limited, and the roofing material or the type of metal such as iron, zinc, aluminum, copper or the like constituting the plating film formed on the surface thereof, or the 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 a sufficient effect of reducing rain noise, and the vibration-damping coating film 12 is smooth and non-uniform, and has little fear 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 or non-swellable mica (manufactured by Yamaguchi Mica Co., Ltd., TM-20) is blended in a weight ratio shown in Table 1. And each coating composition of Examples 1-3 and Comparative Examples 1-3 was prepared. About each obtained coating composition of Examples 1-3 and Comparative Examples 1-3, evaluation of loss coefficient, applicability | paintability, and the suppression effect of a crack were confirmed, and the result is shown in Table 1 and FIGS. 7 shows.

<Evaluation of loss factor>
Each of the coating compositions of Examples 1 to 3 and Comparative Examples 1 to 3 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 to 3 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>
Each coating composition of Examples 1 to 3 and Comparative Examples 1 to 3 was applied to a 0.5 mm thick Galvalume steel plate with a bar coater, and then the Galvalume steel plate was placed in a heating furnace and dried by heating. 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 1-3 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 1-3, it became evaluation of (triangle | delta) or * about the applicability | paintability and the suppression effect of the armpit, but in each coating composition of Examples 1-3. Were evaluated as ◯, and it was confirmed that the coating property and the suppression effect of the armpit were excellent.

  Also, from FIGS. 6 and 7, in the case of Comparative Examples 2 and 3 using mica as the filler, the content of mica was 5 parts by weight with respect to 23.28 parts by weight of the resin particles. The peak of the loss factor of the coating film was 0.02 at 10 ° C., and the performance was still not sufficient for the loss coefficient of 0.03 of the coating film, which is said to provide a sufficient rain noise reduction effect. In the case of the coating composition of Comparative Example 3 in which the content of mica is 20 parts by weight with respect to 23.28 parts by weight of the resin particles, the peak of the loss factor of the coating film becomes 0.065 at 10 ° C. Although it has a reduction effect, it was confirmed that the content of mica was large, and that it was heavy and had a problem in handling.

  From FIG. 5, the peak of the loss factor of the coating film by the coating composition of Comparative Example 1 containing 20 parts by weight of potassium titanate with respect to 23.28 parts by weight of the resin particles is 0.07 at 15 ° C. It was confirmed that it has a good rain noise reduction effect.

  Also, from FIGS. 2 to 4, each coating composition of Examples 1 to 3 containing 5 parts by weight, 10 parts by weight, or 15 parts by weight of potassium titanate with respect to 23.28 parts by weight of resin particles. In the case of products, the peak of the loss coefficient of these coating films exceeded 0.03 at 15 ° C., and it was confirmed that the film has a sufficient rain sound reducing effect.

  Further, when the coating composition of Example 1 and the coating composition of Comparative Example 2 were compared, the content of the filler was 5 parts by weight with respect to 100 parts by weight of the resin particles, but mica was used as the filler. In contrast, the coating film of the coating composition of Comparative Example 2 cannot obtain a sufficient rain noise reduction effect, whereas the coating film of the coating composition of Example 1 using potassium titanate as a filler sufficiently reduces rain noise. Thus, it was confirmed that the coating composition of the present invention can form a vibration-damping coating film having a sufficient effect of reducing rain noise, even though the amount of the filler composition is small.

Claims (2)

A vibration-damping coating composition for water-based roofing material applied to a metal roofing material,
An aqueous resin dispersion in which acrylic resin particles made of an acrylic resin 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;
The potassium titanate is contained in a proportion of 20 to 65 parts by mass with respect to 100 parts by mass of the acrylic resin particles ,
The acrylic resin is a homopolymer composed of monomers of acrylic acid, acrylic acid ester, methacrylic acid, or methacrylic acid ester, or a copolymer formed by polymerizing a plurality of the monomers. A vibration-damping coating composition for roofing material, characterized in that it is a coalescence . The roofing material by which the coating film is formed in the metal roofing material surface with the damping coating composition for roofing materials of Claim 1 .

Images