JP2016142002A - Rooftop waterproofing, heat insulation and protection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rooftop waterproofing, heat insulation and protection method suitable for protecting and maintaining appearance and heat insulation property of rooftop over a long period by coating.SOLUTION: In a rooftop waterproofing, heat insulation and protection method, the following coating materials are coated on top of another, in sequence: two-component curing-type epoxy resin-based primer, coated on a surface of the rooftop waterproof material; a coating material containing a resin emulsion having a resin with a glass transition temperature of 30°C or below dispersed in water, the coating material having a specific gravity of a coated film below 1.0 and thermal conductivity of the coated film of 0.3 W/m K or less; a coating material containing a resin emulsion and a pigment, the resin emulsion having a resin with a glass transition temperature of 30°C or below dispersed in water, the coating material having specific gravity of a coated film of 1.0 or more; and a thermal barrier finish coating material containing 50 mass% or more of white pigment among pigment components contained in a composition, the finish coating material having specific gravity of a coated film of 1.0 or more, solar reflectance of the coated film of 50% or more, and volume concentration of all pigments smaller than volume concentration of all pigments in a waterproof coating.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a roof waterproof and heat insulating protection method suitable for protecting a rooftop for a long period of time by painting and imparting aesthetics and heat insulating properties.

  Waterproofing is performed on rooftops such as roofs of buildings, etc., but this is done by laying a flexible and waterproof resin sheet (rubber sheet) on the surface of the concrete board and covering it with asphalt or mortar. Is the most common.

  Such a waterproof layer constructed to prevent water leakage needs to be re-applied when it deteriorates severely over time, but it has problems such as disposal of resin sheets and increased construction costs.

  In response to these problems, the waterproof layer may be painted for the purpose of beauty and protection. For example, Patent Document 1 discloses a method of forming a heat-resistant undercoat film layer containing a specific amount of hollow beads on a waterproof layer, and forming a highly reflective / radiative overcoat film on the undercoat film layer. Is described.

According to the method described in Patent Document 1, although the waterproof layer can be protected by a simple method, the heat insulating layer has been deteriorated over time, and the effect of preventing the deterioration becomes insufficient.
Patent Document 2 describes a heat insulating waterproofing method in which a primer, a heat insulating paint containing specific high-strength inorganic foam particles, a waterproof paint, and a top coat are sequentially applied to the roof surface.
According to such a heat-insulating waterproofing method, it is possible to suppress indoor temperature rise due to direct sunlight rays of the sun in the summer to the roof part and lead to extension of the use period of the building, but when the heat-insulating coating is thickly coated, There was a problem in the smoothness of the coating surface, such as wrinkles on the surface of the coating film due to the waterproof coating.

Japanese Patent No. 3001863 JP 2001-311263 A

  An object of the present invention is to provide a roof waterproof and heat insulating protection method suitable for protecting the roof for a long period of time by painting and imparting aesthetics and heat insulation.

  As a result of earnestly examining the above-mentioned problems, the present inventors have applied a paint having a specific property value sequentially after applying a two-pack type epoxy resin-based undercoat paint on a waterproofing material for roofing, It has been found that even if a thick heat insulating layer is provided, the overall smoothness of the coating film finally obtained is improved, and the present invention has been achieved.

That is, the present invention
(1) A process of applying a two-component curable epoxy resin base coat on the surface of the roof waterproofing material,
(2) On the foundation layer obtained in step (1), a resin emulsion obtained by water-dispersing a resin having a glass transition temperature of 30 ° C. or less is included, and the specific gravity of the coating film is less than 1.0. Applying a paint having a thermal conductivity of 0.3 W / m · K or less to form a heat insulating coating layer;
(3) On the heat-insulating coating layer obtained in step (2), a resin emulsion formed by dispersing a resin having a glass transition temperature of 30 ° C. or less in water and a pigment, and having a coating film specific gravity of 1.0 A process of forming a waterproof coating layer by applying the above paint,
(4) On the waterproof coating layer obtained in step (3), among the pigment components contained in the composition, the white pigment is contained in an amount of 50% by mass or more, and the specific gravity of the coating is 1.0 or more. And applying a top heat-shielding paint having a solar reflectance of 50% or more of the formed paint film to form a heat-shielding paint film layer,
The rooftop waterproof insulation protection method, wherein the total pigment volume concentration of the paint for forming the thermal barrier coating layer is lower than the total pigment volume concentration of the paint for forming the waterproof coating layer,
About.

According to the protection method of the present invention, a coating film having a specific gravity of 1.0 or more by a paint containing a resin emulsion having a specific glass transition temperature is provided for a heat insulating coating layer having a specific gravity of less than 1.0. Yes. Thereby, there exists an advantage that the finished external appearance of a laminated coating film is excellent, exhibiting performance, such as heat insulation and waterproofness.
Moreover, in the method of the present invention, a thermal barrier coating layer having a specific pigment composition is provided as a top coat, so that the laminated coating and the waterproof material underneath are maintained by sunlight while maintaining a good finished appearance. Deterioration can be suppressed.

  According to the protection method of the present invention, it is possible to suppress an increase in indoor temperature while protecting a roof of a building or the like for a long period of time, and contribute to energy saving inside the building or the like.

  Examples of the roof to which the protection method of the present invention is applied include concrete buildings, for example, rooftops of apartment houses, and rooftops such as roof balconies, and waterproof materials constructed on such roofs are to be painted.

  Examples of the waterproofing material include a waterproofing coating material provided by painting and a waterproofing sheet material provided by sticking a sheet. Examples of the waterproofing coating material include urethane rubber, acrylic rubber, chloroprene rubber, and rubber asphalt. Silicone rubber type, polymer cement type and the like can be mentioned. On the other hand, the waterproof sheet material is a sheet of approximately 1mm to 2mm in thickness, which is mainly composed of petroleum-derived materials such as vinyl chloride resin, and is cut to the required area and fixed to the base with an adhesive or metal tool. The sheets are bonded together. Examples of the waterproof sheet include a vinyl chloride sheet and a polyethylene sheet.

  Sealing may be applied to the joint of the waterproof material from the viewpoint of waterproofness. Examples of the sealing material include silicone-based sealing materials, modified silicone-based sealing materials, polysulfide-based sealing materials, modified polysulfide-based sealing materials, acrylic urethane-based sealing materials, polyurethane-based sealing materials, SBR-based sealing materials, and butyl rubber-based sealing materials. Can be mentioned. These may be either a one-component form or a two-component form.

  First, the dust on the construction surface is removed to clean the surface, and the primer is applied.

<Undercoat painting process>
In the present invention, as the undercoat paint, a two-component curable epoxy resin-based undercoat paint having an epoxy resin-containing component as a main component and a polyamine-containing component as a curing agent is applied. This is from the viewpoint of adhesion between the waterproof material and a heat insulating paint described later.

  The epoxy resin and polyamine compound may be organic solvent-based or water-based, and in the case of water-based, any of water-dispersible and water-soluble types may be used.

  The undercoat paint is applied by a method such as brush, roller or spray.

  The undercoating can be performed for 10 hours to 7 days, preferably 15 hours to 72 hours under normal temperature drying conditions so that the dry film thickness is 10 to 60 μm, preferably 25 to 40 μm, and can be forced to dry as necessary. .

<Insulation paint>
Next, when the undercoat paint dries, a heat insulating paint is applied. The heat insulating paint includes a resin emulsion obtained by water-dispersing a resin having a glass transition temperature of 30 ° C. or less, preferably 0 to 25 ° C., and the specific gravity of the coating film is less than 1.0, particularly 0.95 or less. The thermal conductivity is 0.3 W / m · K or less, particularly 0.08 to 0.25 W / m · K.

  When the glass transition temperature of the resin emulsion contained in the heat insulating coating exceeds 30 ° C., the waterproof property of the heat insulating coating layer is lowered, which is not preferable.

  Moreover, when the specific gravity of the coating film exceeds 1.0, the heat insulating property of the laminated coating film decreases, and when the thermal conductivity exceeds 0.3 W / m · K, the heat insulating property of the heat insulating coating layer decreases, This is not preferable because the waterproof layer in the interior is quickly deteriorated and the temperature of the indoor space is affected by the outside air.

  Examples of the resin species in the resin emulsion include acrylic resins, vinyl acetate resins, vinyl chloride resins, styrene / butadiene resins, epoxy resins, alkyd resins, polyester resins, silicon resins, fluorine resins, Examples thereof include polyurethane-based resins and acrylic urethane-based resins (including two-liquid type), and these can be used alone or in combination of two or more. Particularly suitable as a resin emulsion is a (co) polymer emulsion obtained by emulsion polymerization of one or more vinyl monomers selected from alkyl (meth) acrylate, styrene, vinyl acetate, unsaturated acid, and the like. Among them, a carbonyl group-containing (co) polymer emulsion is preferable from the viewpoint of the appearance of the laminated coating film.

  The heat-insulating paint preferably contains hollow particles. This is from the viewpoint of heat insulation.

  Specific examples of the hollow particles include resin foam particles such as expanded polystyrene particles, expanded polyethylene particles, expanded polypropylene particles, and expanded polyurethane; inorganic foam particles such as pearlite, volcanic rubble, and burned vermiculite; acrylic resin , Styrene resin, acrylic-styrene copolymer resin, acrylic-acrylonitrile copolymer resin, acrylic-styrene-acrylonitrile copolymer resin, acrylonitrile-methacrylonitrile copolymer resin, acrylic-acrylonitrile-methacrylonitrile copolymer resin, vinylidene chloride-acrylonitrile copolymer Organic balloon made of resin such as polymerized resin; glass balloon such as silica balloon and shirasu balloon; inorganic balloon such as ceramic balloon such as alumina silica balloon; The organic-inorganic composite balloons or the like decorated with an inorganic material such as alumina and the like, which may be used alone or in combination of two or more.

  Among these, resin foam particles and organic-inorganic composite balloons are suitable from the viewpoint of heat insulation and waterproofness of the heat insulation layer.

  The average particle diameter of the hollow particles is preferably 0.02 to 8 mm, particularly 0.05 to 2 mm, from the viewpoints of coating workability and paint viscosity.

  In the present invention, the average particle size is defined as a value measured by a particle size distribution measuring device.

  The content of the hollow particles is preferably 2 to 10 parts by weight, preferably 3 to 8 parts by weight based on the solid content of the resin emulsion, from the viewpoint of heat insulation, thick film properties and coating strength. ing.

  If necessary, pigments, aggregates, film-forming aids, thickening sagging inhibitors, antifoaming agents, dispersants, flame retardants, fibrous substances, and the like can be added to the heat insulating paint. .

  Among these, conventionally known pigments can be used without limitation, for example, coloring pigments such as titanium oxide, carbon black, bengara; barita powder, precipitated barium sulfate, barium carbonate, calcium carbonate, gypsum, Examples include extender pigments such as clay, silica, white carbon, diatomaceous earth, talc, magnesium carbonate, alumina white, and gloss white, and these can be used alone or in combination of two or more.

  The pigment volume concentration of the heat insulating paint is desirably adjusted within a range of 1 to 30%, preferably within a range of 5 to 20%.

  In the present specification, the pigment volume concentration is a volume ratio of the pigment content in the total solid content of the total resin content and the total pigment content in the paint. In this specification, the specific gravity of the pigment which is the basis for calculating the volume of the pigment is according to “Paint Raw Material Handbook 6th Edition” (Japan Paint Manufacturers Association), and the specific gravity of the resin solids is Approximate to 1.

  As the flame retardant, conventionally known ones can be used. Specifically, decabromodiphenyl ether, octabromodiphenyl ether, tetrabromodiphenyl ether, hexabromocyclododecane, bistribromophenoxyethane, ethylenebistetrabromophthalimide, Brominated flame retardants such as tetrabromoethane and hexafate; trimethyl phosphate: triethyl phosphate, tributyl phosphate, trioctyl phosphate, triphenyl phosphate, tributoxyethyl phosphate, octyl diphenyl phosphate, tricres Zyl phosphate, cresyl phenyl phosphate, trixylenyl phosphate, 2-naphthyl diphenyl phosphate, cresyl di 2,6-xyleni Non-halogenated phosphorus flame retardant such as phosphate, aromatic condensed phosphate ester, mixture of aromatic condensed phosphate ester and polyoxyalkylene phosphate ester, polyphosphonate, polyphosphate, polyphosphate, red phosphorus Materials: trichloroethyl phosphate, tris (2-chloropropyl) phosphate, tris (2,3-dichloropropyl) phosphate, tris (2,3-dibromopropyl) phosphate, tris (bromochloropropyl) phosphate, Phosphorous halide flame retardants such as tris (tribromoneopentyl) phosphate, tris (chloropropyl) phosphate, 2,3-dibromopropyl phosphate, 2,3-chloropropyl phosphate; chlorinated paraffin, Perchlorocyclopentadecane, chlorinated vinyl Chlorine flame retardants such as phenyl; antimony compounds such as antimony trioxide and antimony pentoxide; aluminum hydroxide, magnesium hydroxide, calcium aluminate, zinc borate, barium metaborate, molybdenum oxide, ammonium molybdate, zirconium oxide Inorganic flame retardants such as zirconium hydroxide, tin oxide and tin hydroxide can be used alone or in combination of two or more.

  As a compounding quantity of the said flame retardant, the inside of the range of 10-300 mass parts with respect to 100 mass parts of resin solid content contained in a heat insulation coating material, Preferably 20-200 mass parts is suitable.

  Although there is no restriction | limiting in particular as a coating method of a heat insulation coating material, A brush coating, brush coating, spatula coating, etc. are suitable. As a coating amount, it is applied once so that the dry coating film is 1 to 4 mm, preferably 1.5 to 2.5 mm, and dried at room temperature for 40 hours to 7 days, preferably 48 hours to 4 days, Next, the same heat-insulating paint is applied on the heat-insulating coating layer so that the dry coating has a thickness of 1 to 4 mm, preferably 2 to 3 mm, and is dried at room temperature for 40 hours to 7 days, preferably 48 hours to 4 days. It is suitable from the viewpoint of heat insulation and painting workability.

  After drying the thermal insulation paint, apply waterproof paint. As the waterproof paint, various waterproof materials conventionally used for construction can be used. In particular, a resin having a glass transition temperature of 30 ° C. or lower, preferably 25 ° C. or lower, preferably −30 ° C. to 0 ° C. is dispersed in water. The specific gravity of the coating film is 1.0 or more, particularly 1.2 or more.

  In the present invention, the glass transition temperature (absolute temperature) is a value calculated by the following formula.

1 / Tg = W1 / T1 + W2 / T2 +... Wn / Tn
In the formula, W1, W2... Wn are mass% of each monomer [= (blending amount of each monomer / total monomer mass) × 100], and T1, T2... Tn are homopolymer glass of each monomer. Transition temperature (absolute temperature). The glass transition temperature of the homopolymer of each monomer is a value according to Polymer Hand Book (4th edition, edited by J. Brandrup / EHImmergut), and the glass transition temperature of a monomer not described in the literature is the homopolymeric homopolymer of the monomer. The polymer is synthesized so that the weight average molecular weight is about 50,000, and the value when the glass transition temperature is measured by differential scanning thermal analysis is used.

  When the glass transition temperature of the resin emulsion exceeds 30 ° C., the laminated coating film obtained by the method of the present invention may be cracked by long-term exposure, which is not preferable.

  Moreover, when the specific gravity of the waterproof coating is less than 1.0, the finished appearance of the waterproof coating on the heat insulating coating is inferior, which is not preferable.

  Examples of the polymerizable unsaturated monomer used in the resin emulsion include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, t-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, Decyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate Contains linear or branched alkyl groups such as rate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecyl (meth) acrylate, icosyl (meth) acrylate, heicosyl (meth) acrylate, docosyl (meth) acrylate, etc. Acrylates; vinyl aromatic compounds such as styrene and α-methylstyrene; (meth) acrylates having a cyclic hydrocarbon group such as cyclohexyl (meth) acrylate and isobornyl (meth) acrylate; 2-hydroxyethyl (meth) acrylate 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, hydroxyalkyl (meth) acrylate such as hydroxybutyl (meth) acrylate, allyl alcohol, the above hydro Hydroxyl-containing polymerizable unsaturated monomers such as polyoxyethylene chain-containing (meth) acrylate having a hydroxyl group at the molecular end; a (meth) acrylic acid, maleic acid, crotonic acid, β -Carboxyl group-containing polymerizable unsaturated monomer such as carboxyethyl acrylate; (meth) acrolein, formylstyrene, vinyl alkyl ketone having 4 to 7 carbon atoms (for example, vinyl methyl ketone, vinyl ethyl ketone, vinyl butyl ketone, etc.), aceto Carbonyl group-containing polymerizable unsaturated monomers such as acetoxyethyl (meth) acrylate, acetoacetoxyallyl ester, diacetone (meth) acrylamide; aralkyl (meth) acrylates such as benzyl (meth) acrylate; 2-methoxyethyl Alkoxyalkyl (meth) acrylates such as (meth) acrylate and 2-ethoxyethyl (meth) acrylate; perfluoroalkyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate; (meth) acrylamide, (meth) acrylonitrile Vinyl ester compounds such as vinyl acetate and vinyl propionate; allyl (meth) acrylate, ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, 1,3-butylene Glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, 1,4-butanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-he Sundiol di (meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tetra (meth) acrylate, glycerol di (meth) acrylate, 1,1,1-trishydroxymethylethanedi (meth) acrylate, 1,1,1 -Trishydroxymethylethane tri (meth) acrylate, 1,1,1-trishydroxymethylpropane tri (meth) acrylate, triallyl isocyanurate, diallyl terephthalate, divinylbenzene, etc. Polyvinyl compounds having a saturated group, etc .; glycidyl (meth) acrylate, β-methylglycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, 3,4-epoxycyclohexylethyl Epoxy group-containing polymerizable unsaturated monomers such as ru (meth) acrylate, 3,4-epoxycyclohexylpropyl (meth) acrylate, allyl glycidyl ether; isocyanate ethyl (meth) acrylate, m-isopropenyl-α, α-dimethyl Isocyanate group-containing polymerizable unsaturated monomers such as benzyl isocyanate; alkoxysilyl group-containing polymerizable monomers such as vinyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, and γ-methacryloyloxypropyltriethoxysilane Saturated monomer: reaction product of epoxy group-containing polymerizable unsaturated monomer or hydroxyl group-containing polymerizable unsaturated monomer and unsaturated fatty acid, dicyclopentenyloxyethyl (meth) acrylate, dicyclopentenyloxy Propyl (meth) acrylate, dicyclopentenyl (meth) oxide curable group-containing polymerizable unsaturated monomers such as acrylate and the like, which may be used alone or in combination of two or more.

  Of these, the use of a carbonyl group-containing polymerizable unsaturated monomer is preferable because a laminated coating film having excellent smoothness can be obtained even when the heat-insulating coating layer is thickly coated.

  As the pigment contained in the waterproof paint, for example, it can be appropriately selected from those exemplified in the description of the heat insulating paint.

  The pigment volume concentration of the waterproof coating is desirably adjusted within a range of 15 to 60%, preferably 15 to 45%, more preferably 25 to 42%.

  If the pigment volume concentration is less than 15%, the waterproof property is insufficient. On the other hand, if the pigment volume concentration exceeds 60%, the smoothness of the waterproof coating film on the heat insulating coating layer may be lowered.

  The waterproof paint is preferably a combination of extender pigments and colored pigments. The combined use ratio of the extender pigment / colored pigment mass ratio is 99/1 to 60/40, preferably 95/5 to 70/30. It is preferable from the viewpoint of water resistance.

  The said waterproof coating material can mix | blend a hydrazine derivative as needed from the objective of improving the waterproofness of a waterproof coating layer, the adhesiveness with a heat insulation coating layer, and the toughness of the coating film in normal temperature. The hydrazine derivative has a functional group that crosslinks with the carbonyl group of the copolymer emulsion. Specific examples thereof include hydrazine, hydrazine hydrate, oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, and glutaric acid dihydrazide. Dihydrazides of saturated aliphatic carboxylic acids having 2 to 18 carbon atoms such as adipic acid dihydrazide and sebacic acid dihydrazide; monohydric unsaturated dicarboxylic acid dihydrazides such as maleic acid dihydrazide, fumaric acid dihydrazide and itaconic acid dihydrazide; phthalic acid, Terephthalic acid or isophthalic acid dihydrazide; pyromellitic acid dihydrazide, trihydrazide or tetrahydrazide; nitrilotriacetic acid trihydrazide, citric acid trihydrazide, 1,2,4-benzenetrihydrazide; Range amine tetraacetic acid tetrahydrazide, 1,4,5,8-naphthoic acid tetrahydrazide; polyhydrazide obtained by reacting a low polymer having a carboxylic acid lower alkyl ester group with hydrazine or hydrazine hydrate (hydrazine hydride), etc. Carbonic acid dihydrazide, bissemicarbazide; diisocyanate such as hexamethylene diisocyanate and isophorone diisocyanate and polyisocyanate compounds derived therefrom are reacted with N, N-substituted hydrazine such as N, N-dimethylhydrazine and the above-mentioned hydrazide in excess. Polyfunctional semicarbazide obtained; Isocyanate in a reaction product of the polyisocyanate compound and an active hydrogen compound containing a hydrophilic group such as polyether polyols and polyethylene glycol monoalkyl ethers A mixture of polyfunctional semicarbazide and aqueous polyfunctional semicarbazide; aqueous polyfunctional semicarbazide obtained by overreact the above-exemplified dihydrazide based bisacetyllaurate di hydrazone, or the like may be suitably used. The compounds described above can be used alone or in combination of two or more.

  In the present invention, as the waterproof paint, it is preferable to use a material corresponding to a paint film finishing material defined in JIS A6021.

  Although there is no restriction | limiting in particular as the coating method of the said waterproofing coating material, A brush coating, brush coating, spatula coating, roller coating, etc. are suitable. The coating amount is such that the dried coating film is dried at room temperature for 40 hours to 7 days, preferably 48 hours to 4 days, so that the dried coating film has a thickness of 0.2 to 1 mm, preferably 0.3 to 0.5 mm. It is suitable from the viewpoint of room temperature drying and smoothness.

  After the waterproof paint has dried, apply the overcoat thermal barrier paint. The top coat thermal barrier paint in the present invention contains 50% by mass or more, preferably 70% by mass or more of a white pigment among the pigment components contained in the composition, and the specific gravity of the coating film is 1.0 or more, preferably 1 The coating film has a solar reflectance of 50% or more, preferably 70% or more.

  In the present invention, the total pigment volume concentration of the coating material for forming the thermal barrier coating layer is lower than the total pigment volume concentration of the coating material for forming the waterproof coating layer.

  If the relationship between the pigment volume concentration and the thermal barrier coating layer and the waterproof coating layer is different from the above, the finished appearance and stain resistance of the laminated coating film are insufficient, which is not preferable.

  As the resin emulsion contained in the above-mentioned top coat thermal barrier paint, those known in the paint field can be used without limitation, and for example, selected from those listed in the description of the above heat insulating paint and waterproof paint can be used. it can.

  Examples of the white pigment include titanium oxide, aluminum oxide, silicon oxide, barium sulfate, and magnesium oxide.

  The pigment volume concentration of the white pigment in the thermal barrier coating is 5 to 40%, preferably 10 to 25%.

  Although there is no restriction | limiting in particular as the coating method of the said heat-shielding coating material, A roller, brush coating, a spray, etc. are suitable. As a coating amount, it is applied once so that the dried coating film has a thickness of 20 to 40 μm, preferably 25 to 35 μm, dried for 4 hours to 7 days, preferably 5 hours to 3 days, and then the heat shielding. The same thermal barrier coating is applied on the coating layer so that the dried coating has a thickness of 20 to 40 μm, preferably 25 to 35 μm, and dried at room temperature for 4 to 7 days, preferably 5 to 3 days. Is suitable in terms of heat insulation and painting workability.

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to only these examples. In the following examples, “part” and “%” mean “part by mass” and “% by mass”, respectively.

<Manufacture of paints (heat insulation paint, waterproof paint, top coat)>
Production Examples 1-9
Insulation paints (B-1) to (B-3), waterproof paints (C-1) to (C-3), and topcoat paints (D-1) to (D-3) having the composition shown in Table 1 below. Manufactured.

Note 1) Resin emulsion (A-1): Aqueous emulsion of acrylic / styrene copolymer (solid content 55%, glass transition temperature 20 ° C.,
Note 2) Resin emulsion (A-2): Aqueous emulsion of acrylic / styrene copolymer (solid content 55%, glass transition temperature 40 ° C.,
Note 3) Resin emulsion (A-3): Aqueous emulsion of acrylic / styrene copolymer containing diacetone acrylamide as a copolymerization component (solid content 55%, glass transition temperature −20 ° C.)
Note 4) Expanded polystyrene resin: thermal conductivity 0.03 w / m · K, average particle diameter 1 mm,
Note 5) Titanium oxide: specific gravity 4.0,
Note 6) Carbon black: specific gravity 1.82.
Note 7) extender pigment: specific gravity 2.7, calcium carbonate,
Note 8) Aluminum hydroxide: specific gravity 2.3,
Note 9) Film-forming aid: “TEXNOL” (trade name, manufactured by Eastman Chemical Co., Ltd.)
Note 10) Thickener: “Adecanol UH-420” (trade name, manufactured by Asahi Denka)
Note 11) Antifoaming agent: “SN deformer A-63” (trade name, manufactured by San Nopco),
Note 12) Dispersant: “Nopco Santo K” (trade name, manufactured by San Nopco).

<Property value of each paint and coating film>
(*) Pigment volume concentration: calculated according to the method described in the specification.
(*) Specific gravity of coating film: Performed according to the determination of the density of the dried coating film described in JIS K 5600-5-11 (2014). However, as the test pieces, the heat insulating paints (B-1) to (B-3) are 1000 μm, the waterproof paints (C-1) to (C-3) are 400 μm, and the top coats (D-1) to (D−). 3) each coated on a fluororesin-treated steel plate to a dry film thickness of 100 μm, dried at 20 ° C. and 65% for 7 days, and after peeling, the coating was repeated repeatedly at 20 ° C. and 65%. The free coating film dried for one day shall be used.
(*)Thermal conductivity:
The heat insulating paints (B-1) to (B-3) are applied on the steel sheet coated with the fluororesin so that the dry film thickness is 4 mm, and the waterproof paints (C-1) to (C-3) are applied. Spray coating so that the dry film thickness is 0.4 mm, and the top coating materials (D-1) to (D-3) are roller-coated so that the dry film thickness is 0.06 mm. Each coated steel sheet was obtained by drying for 7 days in a constant temperature and humidity chamber of 50% RH. Subsequently, each coating film was peeled off from the coated steel sheet to prepare a free coating film.
The free coating film thus obtained was cut into 70 × 150 mm, and the thermal conductivity (W / m · K) was measured using a thermal conductivity meter “KemthrmQTM” (trade name, manufactured by Kyoto Electronics Industry Co., Ltd.).
(*) JIS A 6021 suitability:
A test plate was prepared according to the standard of JIS A 6021 and a standard test was performed.
◯: Standard test passed, ×; Standard test failed (*) Solar reflectance:
According to JISK5602, the spectral reflectance was measured and the solar reflectance was calculated. The higher the value, the better.

<Formation of laminated coated plate>
Example 1
Apply a solvent-type two-component cured epoxy resin paint as a primer coating on a slate plate with a thickness of 5 mm and a size of 200 mm x 300 mm using a brush to a dry film thickness of 30 μm and dry at 20 ° C. for 16 hours. Then, the heat insulating paint (B-1) is applied so that the dry film thickness is 2 mm, dried at 20 ° C. for 72 hours, and the same heat insulating paint (B- 1) is applied so that the dry film thickness is 2 mm, dried at 20 ° C. for 72 hours, and spray-coated with a waterproof paint (C-1) so that the dry film thickness is 0.4 mm, It was dried at 25 ° C. for 48 hours, and the top coat (C-1) was roller-coated on the resulting waterproof coating so that the dry film thickness was 0.06 mm and dried at 20 ° C. and 65% RH for 7 days. To obtain a laminated coated plate.

Examples 2-4 and Comparative Examples 1-9
In Example 1, a laminated coated plate was obtained in the same manner as in Example 1 except that the combination of paints used in the first to fourth layers was as shown in Table 2 below.

<Evaluation test>
Each laminated coated plate obtained in Examples 1 to 4 and Comparative Examples 1 to 9 was subjected to the following test. The results are also shown in Table 2.

(*) Outdoor exposure: Each laminated coating plate obtained in Examples 1 to 4 and Comparative Examples 1 to 9 was installed on an exposure test stand at the Tokyo office of Kansai Paint Co., Ltd. in Ota-ku, Tokyo. The surface state of the coating film and the degree of contamination of the coating film were visually evaluated.
Coating state:
○: No abnormality is observed in the coating film,
X: Cracking, peeling, and swelling are observed in the coating film.
(*) Contamination state of the coating film:
◎: Almost clean
○: Pale dirt is recognized but practical level,
Δ: Conspicuous dirt is recognized in a part of the coating film,
X: The whole coating film is clearly darkened and contaminated.
(*) Surface temperature of coating film: The temperature measurement container shown in FIGS. 1 and 2 was prepared, and each laminated coating plate obtained in Examples 1 to 4 and Comparative Examples 1 to 9 was installed. The surface temperature of the coating film was measured at Kansai Paint Co., Ltd. Tokyo Office in Ota-ku, Tokyo (at 14:00 during the summer months from July to August), and the average value of the maximum surface temperatures was calculated.
(*) Back surface temperature of coating film: Temperature measuring containers shown in FIGS. 1 and 2 were prepared, and the respective laminated coated plates obtained in Examples 1 to 4 and Comparative Examples 1 to 9 were installed. The back surface temperature of the laminated coated plate was measured at Kansai Paint Co., Ltd. Tokyo office in Ota-ku, Tokyo (at 14:00 during the day of summer from July to August), and the average of the maximum back surface temperature was calculated.
(*) Appearance of the third layer (waterproof coating on the heat insulating coating) In Examples 1 to 4 and Comparative Examples 1 to 9, the third layer (the second layer for Comparative Example 9), that is, the top coat is applied. The finished appearance of the previous laminated coating film was evaluated according to the following evaluation criteria.
A: There is a smooth feeling, very good,
〇: Slight dent is recognized,
△: Some deep wrinkles are recognized,
X: Deep wrinkles are noticeable.

In the method of this invention, it is the schematic of the side surface of the temperature measuring device for measuring the surface of a coating film, and a back surface temperature. In the method of this invention, it is the schematic of the upper surface of the temperature measuring device for measuring the surface of a coating film, and a back surface temperature. It is a schematic block diagram of the laminated coating film of this invention method description.

DESCRIPTION OF SYMBOLS 10 Base material 20 Laminated coating film 21 Undercoat coating film 22 Thermal insulation coating film 23 Waterproof coating film 24 Thermal insulation coating film 30 Thermal insulation material

Claims (3)

(1) A process of applying a two-component curable epoxy resin base coat on the surface of the roof waterproofing material,
(2) On the foundation layer obtained in step (1), including a resin emulsion obtained by water-dispersing a resin having a glass transition temperature of 30 ° C. or less, the specific gravity of the coating film is less than 1.0, Applying a paint having a thermal conductivity of 0.3 W / m · K or less to form a heat insulating coating layer;
(3) On the heat-insulating coating layer obtained in step (2), a resin emulsion formed by dispersing a resin having a glass transition temperature of 30 ° C. or less in water and a pigment, and having a coating film specific gravity of 1.0 A process of forming a waterproof coating layer by applying the above paint,
(4) On the waterproof coating layer obtained in step (3), among the pigment components contained in the composition, the white pigment is contained in an amount of 50% by mass or more, and the specific gravity of the coating is 1.0 or more. And applying a top heat-shielding paint having a solar reflectance of 50% or more of the formed paint film to form a heat-shielding paint film layer,
A rooftop waterproof heat insulating protective method characterized in that the total pigment volume concentration of a paint for forming a thermal barrier coating layer is lower than the total pigment volume concentration of a paint for forming a waterproof coating layer. The roof waterproof insulation protection method according to claim 1, wherein the waterproof paint is a paint defined in JIS A6021. A coated article obtained by the protection method according to claim 1.

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