JP5687155B2 - Quick-drying thermal barrier coating composition - Google Patents

Description

 The present invention relates to a quick-drying heat-insulating water-based coating composition, and particularly has quick-drying properties and heat-shielding properties, and is excellent in coating film performance including wear resistance and weather resistance as well as asphalt adhesion. It is a dry type thermal barrier water-based paint composition.

Conventionally, solvent-type paints are generally used as general dry paints used for building exteriors, floors, roads, and the like. Solvent type paints have no problem in terms of performance, but have solvent toxicity or flammability problems. Especially in the above applications, it is impossible to recover the solvent used. Eventually, it volatilizes into the atmosphere, which is one of the causes of waste of earth resources and environmental pollution problems.

Against this background, water-based paints mainly composed of emulsion have been used as an alternative technique in recent years. Water-based paints are much more preferable than solvent-type paints in terms of safety and environment, but they take a long time to dry, which is a big problem in actual painting work. Particularly in outdoor construction applications, there are many occasions where the coating film is damaged by exposure to rain, snow, wind, dust, and other contaminants during drying, and paints having a drying speed as high as possible are required. In addition, a water-based type paint may have a drying property that is delayed under environmental conditions, particularly at low temperature and high humidity, and a paint that always has a high drying speed is required regardless of the environmental conditions. The drying property is in a relation with the stability of the coating material, and it is necessary to improve the drying property while ensuring the stability of the coating material.

As a technique for satisfying the above problems, the present inventors have already proposed Patent Document 1, in which (1) an α, β-ethylenic unsaturation containing 50% by weight or more of acrylic acid or methacrylic acid ester. An aqueous dispersion base resin obtained by polymerizing monomers, (2) an amine polymer obtained by polymerizing an allyl group-containing secondary or tertiary amine, and (3) an excess amount from the amino group of (2) A quick-drying aqueous coating composition containing an essential volatile base as an essential component is disclosed (see Patent Document 1).

  On the other hand, roads and buildings that were exposed to sunlight during summer days absorb the energy, and the temperature rises and dissipates heat at night, so the temperature in urban areas rises compared to the surrounding area. It is said that this is what contributes to the so-called heat island phenomenon. In order to prevent this, it has been studied to apply a thermal barrier coating as a method for reflecting the infrared rays in sunlight and preventing the temperature of roads and buildings, particularly rooftops, from rising. As an index of the temperature increase rate, there is a solar reflectance, and the higher the infrared reflectance, the higher the solar reflectance, and there is an effect of suppressing the temperature increase (see Non-Patent Document 1).

  In general paints, pigments with low solar reflectance such as carbon black and black iron oxide are used for color adjustment. Since these pigments easily absorb infrared rays, structures and roads such as buildings coated with these paints may increase the temperature of structures and roads due to the absorption of infrared rays, which may cause the heat island phenomenon described above. It has been pointed out.

  Therefore, recently, paints that reflect light having a wavelength of 780 nm to 2500 nm in the near-infrared region of sunlight are being studied. Such a thermal barrier paint uses a composite metal pigment that reflects infrared rays as a part of the color pigment, and an infrared reflection effect can be expected from a paint containing carbon black or black iron oxide as described above. However, the performance is still insufficient, and some pigment compositions contain chromium and the like, and problems remain in terms of safety and health.

  On the other hand, a composition for forming an infrared transmitting layer in which infrared absorption is lowered by using a pigment having an infrared absorption rate of 50% or less is proposed, and an infrared reflector and a treated product using the composition are also proposed at the same time. (See Patent Document 2). There, a two-layer structure is used in which an infrared transmission layer is formed as a coating layer on an infrared reflector.

  However, in this layer structure, it is necessary to apply paints having different composition at least twice, and it takes time to clean the coating machine for changing paints, and the work process is complicated. In addition, when the upper layer coating is worn away by abrasion or peeled off due to deterioration, the lower layer coating having a color different from that of the upper layer coating is exposed, resulting in a mottled pattern. Furthermore, when it is necessary to process painting and drying in a short time on a road or the like and to make the time for opening the road as short as possible, it is also necessary to complete it by one painting.

  Further, a quick-drying aqueous coating composition based on the technique of Patent Document 1 is used, and a titanium oxide pigment, a zinc oxide pigment, a manganese yttrium black pigment, an azo pigment, a benzimidazolone pigment, a quinacridone pigment, copper phthalocyanine blue An aqueous thermal barrier coating composition that combines an infrared reflective pigment selected from pigments has been proposed (see Patent Document 3). However, in this technique, the near-infrared reflection effect is low, and the weather resistance is still insufficient because it may cause significant discoloration.

JP 2004-168998 A Japanese Patent Laid-Open No. 2002-60698 JP 2007-146062 A

Monthly Building Finishing Technology August 2002, Development of Light Reflection and Thermal Radiation Functional Energy Saving Paint

  The present invention was devised in view of the current state of the prior art described above, and its purpose is an ever-drying type that has excellent quick-drying properties and high heat-shielding properties, and excellent coating performance including weather resistance including asphalt adhesion. An object of the present invention is to provide a thermal barrier water-based coating composition.

  As a result of intensive studies to achieve the above object, the present inventors have combined a quick-drying aqueous dispersion base resin with a specific heat-shielding pigment or white silica to enhance the near infrared reflection effect and improve the weather resistance. As a result, the inventors have found that the above object can be achieved, and have completed the present invention.

That is, the present invention
(A) An aqueous dispersion base resin obtained by polymerizing an α, β-ethylenically unsaturated monomer containing 50% by weight or more of an acrylic ester or methacrylic ester, (B) an allyl group-containing secondary or An amine polymer obtained by polymerizing a tertiary amine, (C) an amine polymer (B) an excess amount of a volatile base from the amino group, (D) a heat-shielding pigment, and (E) a speed containing white silica as essential components In a dry water-based paint composition, it is a heat-shielding pigment (D), and the solar reflectance in the near-infrared region (780-2500 nm) determined by JIS K 5602 (the solar reflectance is determined by JIS K 5602). The azo-based black pigment (D1) having a ratio of 30% or more is 0.001 to 5% by weight in the total paint, and the heat-shielding pigment (D), which is a near-infrared reflective pigment other than (D1) (D2) The near-infrared region of the coating film, in which white silica (E) having a particle size of 0.001 to 20% by weight and a particle size of 0.3 to 1 mm is contained in the total coating material by 20 to 60% by weight, and is required by JIS K5602. It is a quick-drying thermal barrier water-based coating composition characterized by having a solar reflectance at (780-2500 nm) of 50% or more.

In the present invention, the near-infrared reflective pigment (D2) other than (D1) is one or two selected from the group consisting of titanium oxide, benzimidazolone pigment, quinacridone pigment, copper phthalocyanine blue pigment, and metal-free phthalocyanine blue. It is a quick-drying heat-shielding water-based coating composition characterized by containing at least one kind of pigment.

The present invention also provides a quick-drying heat-shielding water-based coating composition characterized in that the aqueous dispersion base resin (A) has an average particle diameter of 50 to 200 nm and a standard deviation of the particle diameter of 100 nm or less. is there.

In addition, the present invention is a quick-drying thermal barrier water-based coating composition characterized in that the amine polymer (C) is obtained by polymerizing an amine containing two allyl groups.

  Moreover, this invention is a quick-drying heat-insulating water-coating composition, wherein the amine polymer (C) is neutralized with an organic acid.

  The present invention also provides a quick-drying thermal barrier water-based coating composition, wherein the neutralized organic acid of the amine polymer (C) is formic acid or acetic acid.

  The present invention also provides a quick-drying heat-shielding water-based coating composition characterized in that the drying property of the water-based coating composition is within 15 minutes in a tire adhesion test of 8.12 of JIS K 5665.

  Further, the present invention is a quick-drying heat-shielding water-based coating composition characterized by having a slip resistance of 40 or more in a test using a pendulum skid resistan tester.

  The aqueous coating composition of the present invention is normally dry and extremely quick-drying, has excellent heat shielding properties, and excellent coating film properties including asphalt adhesion and weather resistance. It can be used mainly for building rooftops and roads.

Hereinafter, the quick-drying thermal barrier water-based coating composition of the present invention will be described in detail.
The quick-drying heat-shielding water-based coating composition of the present invention contains a quick-drying water-based resin composition, a specific heat-shielding pigment, and white silica, and has a solar reflectance in the near infrared region (780-2500 nm). Is 50% or more and 77% or less.

    The quick-drying aqueous resin composition used in the present invention is, for example, an aqueous solution obtained by polymerizing an α, β-ethylenically unsaturated monomer containing (A) 50% by weight or more of an acrylic ester or methacrylic ester. More preferably, the dispersion base resin is an aqueous dispersion base resin having an average particle diameter of 50 to 200 nm and a standard deviation of the particle diameter of 100 nm or less. (B) Allyl group-containing secondary or three It is a resin containing an amine polymer obtained by polymerizing a secondary amine, and (C) (B) an excess amount of volatile base from the amino group of the amine polymer. Hereinafter, the components (A) to (C) of the aqueous resin composition will be described.

(A) About Aqueous Dispersion Base Resin Aqueous dispersion base resin is a component as a base resin (binder) for paints in the present invention. As a typical production method, 50 acrylates or methacrylates are used. A known emulsion polymerization method, suspension polymerization method, method of emulsifying after solution polymerization and the like are used for, but not limited to, α, β-ethylenically unsaturated monomers containing at least wt%. .

  In producing the aqueous dispersion base resin of the present invention, an anionic surfactant and a nonionic surfactant are used in combination in order to obtain a target average particle size and particle size distribution of the resin particles. Examples of anionic surfactants include alkali salts of higher alkyl sulfates such as sodium lauryl sulfate, alkali salts of alkylaryl sulfonic acids such as sodium dodecylbenzene sulfonate, isopropyl naphthalene sulfonate, nonyl naphthalene Alkali salts of alkyl naphthalene sulfonic acid such as sodium sulfonic acid, sodium dinonylnaphthalene sulfonate, Alkyl aryl polyethoxy ethanol sulfuric acid such as sodium polyethoxyethanol sulfate of nonylphenol or alkali salt of sulfonic acid, polyoxyethylene lauryl ether Sulfuric acid ester or sodium or ammonium salt of sulfonic acid, and carboxyl group-containing copolymer having a balance between hydrophilicity and hydrophobicity Alkali salts and the like.

  Examples of nonionic surfactants include polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, polyoxyethyne alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenyl ether. , Polyoxyethylene derivatives such as polyoxyethylene monolaurate, polyoxyethylene monostearate, polyoxyethylene monooleate, sorbitan monolaurate, sorbitan monostearate, sorbitan monostearate, sorbitan trioleate, poly Sorbitan fatty acid esters such as oxyethylene sorbitan monolaurate, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene and Examples include so-called pluronic type in which reoxypropylene is block copolymerized, other polyoxyethylene alkylamines, alkylalkanolamides, propenyl groups or other polymerizable unsaturated groups, and reactive emulsifiers containing polyoxyethylene groups. It is done.

  There are two methods for using the surfactant: a method of using the monomer from the time of polymerization, or a method of using it at the time of carrying out water dispersion after polymerization, and either method has no problem. Moreover, about the usage-amount of surfactant, 1.5 to 5% by weight is preferable with respect to all the monomers.

  In order to assist the dispersing effect of the surfactant, it is preferable to copolymerize a monomer containing an acid group in the aqueous dispersion base resin of the present invention. Examples of such monomers include acrylic acid, methacrylic acid, crotonic acid, vinyl acetic acid, itaconic acid, maleic acid, maleic anhydride, fumaric acid, citraconic acid, 2-acrylamido-2-methylpropanesulfonic acid, propenyl group or Other polymerizable unsaturated groups, and acid group-containing monomers such as reactive emulsifiers containing a sulfate ester group or a sulfonic acid group can be mentioned. The amount used is preferably such that the acid value per resin solids is 0.5 to 40 KOH mg / g.

For the measurement of the average particle size and the standard deviation of the particle size of the aqueous dispersion base resin, a laser diffraction / scattering particle size distribution measuring device can be suitably used, but measurement by other methods is also possible. For example, using a laser diffraction / scattering particle size distribution measuring apparatus LA-910 manufactured by Horiba, Ltd., the average particle diameter and the standard deviation of the particle diameter can be obtained from the following mathematical formulas commonly used in statistical processing.
Average particle diameter: X X = ΣXi / n
Standard deviation of particle size: σ σ ² = Σ (Xi−X) ² / n

  As described above, an anionic surfactant and a nonionic surfactant are used in combination, and a monomer having an acid group is further introduced into the aqueous dispersion base resin to adjust the particle size and particle size distribution. An aqueous dispersion base resin having excellent asphalt adhesion can be obtained. The average particle diameter of the aqueous dispersion base resin is preferably 50 to 200 nm, and the standard deviation of the particle diameter is preferably 100 nm or less, and more preferably 50 to 180 nm and 70 nm or less, respectively. In addition, by controlling the particle diameter in this way, it is possible to sufficiently ensure the stability of the paint. When the average particle size and the standard deviation of the particle size are larger than the above ranges, the permeability of the paint to asphalt is suppressed and the adhesion is lowered. In addition, the coating tends to aggregate over time, and the stability is also lowered.

  The preferred molecular weight of the aqueous dispersion base resin is 5,000 to 500,000. If necessary, the molecular weight can be adjusted by using a chain transfer agent. The Tg of the resin is preferably −10 to 60 ° C. from the viewpoint of coating film formation, but is preferably 15 to 35 ° C. in consideration of the drying property at high temperature and the film forming property at low temperature.

  As a monomer used in addition to the monomer containing an acid group, 50% by weight or more of an acrylic acid ester or a methacrylic acid ester is contained in all the monomers. Specific examples of acrylic ester or methacrylic ester include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, n-butyl. Methacrylate, isobutyl acrylate, isobutyl methacrylate, t-butyl acrylate, t-butyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, lauryl acrylate, lauryl methacrylate, stearyl acrylate, stearyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, heptyl acrylate, heptyl Metacri Alkyl ester of acrylic acid or methacrylic acid such as a salt, and further hydroxy group-containing 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4- Examples thereof include hydroxybutyl methacrylate, diethylene glycol monoacrylate, diethylene glycol monomethacrylate, and the like, and lactone-modified products thereof.

  Further, monomers other than acrylic acid esters or methacrylic acid esters can be used within a range not exceeding 50% by weight. Examples of such monomers include styrene, α-methylstyrene, vinyl toluene, vinyl acetate, acrylonitrile. , Vinyl monomers such as methacrylonitrile, amide monomers such as acrylamide, methacrylamide, methylol acrylamide, methylol methacrylamide, methoxymethyl acrylamide, n-butoxymethyl acrylamide, diacetone acrylamide, diacetone methacrylamide It is done.

(B) Amine polymer An amine polymer is a polymer obtained by polymerizing an allyl group-containing secondary or tertiary amine, and is basically water-insoluble in a region where no acid coexists or a region where a base is present. Therefore, in a system in which a volatile base such as ammonia or organic amine is present as in the present invention, the aqueous dispersion base resin and the amine polymer are present independently of each other in a state of being dispersed in water, and further the aqueous dispersion group. Since the particle size and particle size distribution of the agent resin are within a predetermined range, a stable state is ensured. However, when the volatile base is volatilized, the result is that only the aqueous dispersion base resin and the amine polymer are present in the system, and since they start to interact with each other and the amine polymer is insoluble in water, the aqueous dispersion base resin Effectively aggregate. Due to this rapid agglomeration, it is possible to achieve a dryness on the order of minutes while being a water-based paint. When it is repeated, in the coating composition of the present invention, in the form of the coating, it is stable even if an amount of amine polymer necessary and sufficient for aggregation is used, and the volatile base is volatilized in the coating formation process after coating. For the first time, the aqueous dispersion base resin effectively agglomerates, and the dryness on the order of minutes that cannot be obtained by the prior art is achieved.

  Among the amine polymers, particularly an amine polymer obtained from an amine having two allyl groups generally has a ring structure as shown in the following chemical formula 1 and its polymer chain is rigid, so that the aqueous dispersion group It is preferable because it exhibits its function extremely effectively in the aggregation with the agent resin.

  In this way, in the present invention, it is possible to provide an ultra-fast-drying water-based coating composition that does not exist in the prior art, but also for coloration, the amine polymer has only secondary or tertiary amino groups, and primary amino groups. Since there is no group, there is no problem.

  Examples of amine polymers used include homopolymers of allyl group-containing secondary amines such as diallylamine, methylallylamine, and ethylallylamine, copolymers with other monomers, dimethylallylamine, diethylallylamine, methyldiallylamine, ethyl Examples thereof include homopolymers of tertiary amines such as diallylamine, and copolymers with other monomers. Polymers obtained from diallylamine, methyldiallylamine, ethyldiallylamine, etc. having two allyl groups are particularly preferred. Although there is no limitation in particular about the other monomer to copolymerize, sulfur dioxide is the representative. In the case of a copolymer, the copolymerization amount of an allyl group-containing secondary or tertiary amine is preferably 20% by weight or more.

  The molecular weight of the amine polymer is not particularly limited, but is preferably 500 to 50,000 from the viewpoints of the cohesiveness of the aqueous dispersion base resin, the drying property of the coating material, and the stability. In particular, 1000 to 20000, more preferably 1000 to 10,000 are more preferable. Moreover, about the usage-amount, 0.1-10 weight part is preferable with respect to 100 weight part of aqueous dispersion base resin by solid content ratio, and 1-8 weight part is further more preferable.

  As an example of a specific method for producing an amino polymer, there is a method of polymerizing diallylamine or methyldiallylamine hydrochloride in a polar solvent using ammonium persulfate or a water-soluble azo compound as an initiator. Examples of the copolymerization include, but are not limited to, a method of obtaining a 1: 1 alternating copolymer using sulfur dioxide, for example. Specifically available products include PAS-92 and PAS-M-1 manufactured by Nitto Boseki Co., Ltd. The products are usually supplied in the form of hydrochloride, but as a specific method of use, it can be used as it is, and before addition, the hydrochloric acid is neutralized with alkali or the hydrochloric acid is removed with an ion exchange resin. Or exchanged with formate, acetate or other organic acid salts. In particular, when the object to be coated is a metal material such as iron or aluminum, formic acid tends to cause rusting and corrosion of the material after coating, but it can be suppressed by the combined use of rust preventives and rust preventive pigments. More preferably, it is used as a salt of an organic acid such as acetic acid. Specifically available products include Nitto Boseki Co., Ltd. PAS-92A. Examples of organic acids other than formic acid and acetic acid include lactic acid, propionic acid, butyric acid, citric acid, malic acid, and the like.

(C) About a volatile base Although a volatile base will not be specifically limited if it is volatile, Ammonia is especially preferable. For bases other than ammonia, monomethylamine, dimethylamine, trimethylamine, monoethylamine, diethylamine, triethylamine, monoisopropylamine, diisopropylamine, triisopropylamine, monobutylamine, dibutylamine, tributylamine and other alkylamines, diethanolamine, diisopropanol Examples include alkanolamines such as amine, triethanolamine, dimethylethanolamine and diethylethanolamine, alkylenepolyamines such as ethylenediamine, propylenediamine, diethylenetriamine and triethylenetetramine, ethyleneimine, pyrrolidine, piperidine, piperazine and morpholine. As for the amount of volatile base used, an excess amount is required from the amino group of the amine polymer. However, in consideration of the drying property and stability of the paint, the excess amount is 2 to 40 times the amino group of the amine polymer. More preferred.

  In the coating composition of the present invention, a PH buffering agent can be used to ensure the PH stability of the coating. Examples of the PH buffer include ammonium chloride, sodium acetate, sodium phosphate and the like.

(D) Thermal barrier pigment For the azo black pigment (D1) having a solar reflectance of 30% or more in the near-infrared region (780-2500 nm) determined by JIS K 5602, an aromatic ring is generally used. It is a pigment having a structure linked by an azo bond, and is excellent in color adjustment and weather resistance. Specific examples include Chromo Fine Black A-1103 and AF Black E-40 manufactured by Dainichi Seika Kogyo Co., Ltd.

  On the other hand, the infrared reflective pigment (D2) other than (D1) is selected from titanium oxide pigments, benzimidazolone pigments, quinacridone pigments, copper phthalocyanine blue pigments, metal-free phthalocyanine blue pigments, and the like. The role of the near-infrared pigment (D2) can be adjusted to various colors with high solar reflectance and excellent weather resistance. In particular, it is desirable to use a metal-free phthalocyanine blue having a higher heat shielding effect than copper phthalocyanine blue as the blue pigment. Specific examples include Type R 706 (titanium oxide, manufactured by DuPont), AF Red E-17 (quinacridone pigment, manufactured by Dainichi Seika Kogyo Co., Ltd.), DISPERS COA RED105 (quinacridone pigment, manufactured by DIC Corporation), CHOMOFINE RED. 6820 (quinacridone pigment, manufactured by Dainichi Seika Kogyo Co., Ltd.), CHOMOFINE RED 6821 (quinacridone pigment, manufactured by Dainichi Seika Kogyo Co., Ltd.), CHOMOFINE RED 6830 (quinacridone pigment, manufactured by Dainichi Seika Kogyo Co., Ltd.), AF Yellow E-26 (Benzimidazolone pigment, manufactured by Dainichi Seika Kogyo Co., Ltd.), DISPERS COA YELLOW452 (Benzimidazolone pigment, manufactured by DIC Corporation), SYMULER FAST YELLOW4192 (Benzimidazolone pigment, DIC ( )), CHOMOFINE YELLOW 2080 (Benzimidazolone pigment, manufactured by DIC Corporation), AF Blue E-17 (copper phthalocyanine blue pigment, manufactured by Dainichi Seika Kogyo Co., Ltd.), DISPERS COA BLUE681 (metal-free phthalocyanine blue) Pigment, manufactured by DIC Corporation) CHOMOFINE BURE S-2100 (copper phthalocyanine blue pigment, manufactured by Dainichi Seika Kogyo Co., Ltd.), CHOMOFINE BURE 4927B (copper phthalocyanine blue pigment, manufactured by Dainichi Seika Kogyo Co., Ltd.), CHOMOFINE BULE 4940 (copper phthalocyanine blue pigment, manufactured by Dainichi Seika Kogyo Co., Ltd.).

  In all paints, the content of the azo black pigment (D1) is 0.001 to 5% by weight, while the content of the near-infrared reflective pigment (D2) is 0.001 to 20% by weight. . When the amount exceeds this range, the heat shielding effect is reduced for the azo black pigment (D1), the color mixing property is poor for the near-infrared reflective pigment (D2), the drying property is slow, and the water resistance is reduced. It is not preferable. A more preferable range of the near-infrared reflective pigment (D2) is 0.5 to 20% by weight.

(E) About white silica White silica (E) has the characteristic that solar reflectance improves by mixing. The particle size is 0.3 to 1 mm and is 20 to 60% by weight in the entire coating, but 30 to 50% by weight is more preferable. If it is less than 20% by weight, white silica is not arranged on the surface of the coating film, so that uneven surfaces are not formed and slip resistance is lowered. On the other hand, if it exceeds 60% by weight, it immediately settles on the bottom of the paint and hardens. It is not preferable because it falls off the coating film and becomes slippery.

The aqueous coating composition of the present invention is composed of the components (A) to (E) described above, but the solar reflectance in the near infrared region (780 to 2500 nm) of the coating film obtained by coating is 50% or more. 77% or less is secured.

Further, it contains extender pigments or other additives that are usually blended in paints in a range where the solar reflectance in the near infrared region (780 to 2,500 nm) of the coating is ensured to be 50% or more and 77% or less. be able to. Examples of extender pigments include calcium carbonate, precipitated barium sulfate, talc, clay, kaolin, mica, and hollow pigment, but are not particularly limited.

  Further examples of additives include antifoaming agents, thickeners, plasticizers, antifreezing agents, antisettling agents, antiseptics, anti-coloring agents, pigment dispersants, drying accelerators, ultraviolet absorbers, antifungal agents, A rust preventive, a surfactant, a curing agent and the like can be mentioned, but there is no particular limitation.

  The use of the coating composition of the present invention is not particularly limited and can be widely used, such as iron members, exterior wall materials, and roads, but road surface structures and building roof structures are particularly preferable. When used for a road surface structure, the quick-drying property of the paint is preferably within 15 minutes in the tire adhesion test of JIS K5665. In addition, in an iron member, a sodium nitrite etc. as a well-known rust preventive pigment or a rust preventive agent can be used together for rust prevention.

  Hereinafter, in order to show the superiority of the coating composition of the present invention, examples and comparative examples will be described in more detail, but the present invention is not limited thereto. In addition, unless otherwise indicated, the numerical value which shows the mixture ratio in a table | surface represents a weight part and weight%.

{Production of aqueous dispersion base resin]
[Production example]
(1) to (4) shown in Table 1 are charged into a reaction vessel equipped with a thermometer, a condenser, and a stirring device, and the temperature is raised to 80 ° C. (5) is charged after the temperature rise, and (6) to (11) pre-emulsified in advance are added dropwise over 3 hours. After the completion of the dropwise addition, the reaction is terminated by incubating for 1 hour. Thereafter, the mixture was cooled to 40 ° C. or lower, and (12) was added to obtain aqueous dispersion base resins (A) and (B).

(Note 1) Anionic surfactant manufactured by Daiichi Kogyo Seiyaku Co., Ltd. (Note 2) Nonionic surfactant manufactured by Kao Corporation
(Note 3) Measured using a laser diffraction / scattering particle size distribution analyzer LA-910 manufactured by HORIBA, Ltd.

[Formulation and evaluation of coating composition]
[Examples 1 to 10 and Comparative Examples 1 to 5]
Dispersion was carried out for (1) to (13) with the formulation shown in Table 2, and then (14) to (20) were added to prepare each paint, and the paint physical properties and the coating test results were summarized.

(註 4) Pigment dispersant (concentration 100%) manufactured by Enomoto Kasei Co., Ltd.
(Note 5) Maruo Calcium Co., Ltd. Super SSS
(Note 6) DuPont R-706
(Note 7) MA-100 manufactured by Mitsubishi Chemical Corporation
(註 8) Asahi Chemical Industry Co., Ltd. Black 6303
(Note 9) Chromo Fine Black A-1103 manufactured by Dainichi Seika Kogyo Co., Ltd.
(Note 10) AF Yellow E-26 manufactured by Dainichi Seika Kogyo Co., Ltd.
(註 11) AF Red E-17 manufactured by Dainichi Seika Kogyo Co., Ltd.
(註 12) Dainichi Seika Kogyo Co., Ltd. AF Blue E-11
(註 13) D.C. COA BLUE681
(Note 14) Hydroallyzed hydrochloride (concentration 20%) of diallylamine and sulfur dioxide manufactured by Nitto Boseki Co., Ltd. PAS-92
(註 15) Nittobo Co., Ltd. diallylamine, a copolymer of sulfur dioxide and acetate (concentration 20%) PAS-92A
(Note 16) Methyl diallylamine polymer hydrochloride manufactured by Nitto Boseki Co., Ltd. (concentration 60%)
PAS-M-1
(註 17) Color Sand 6.7 White manufactured by Keimu View Sera Co., Ltd.

(註 18) The stability of each paint is evaluated at 50 ° C. for 2 weeks.
The case where the change from the initial stage was not large and there was no abnormality was indicated as ◯, and the case where there was an abnormality such as pigment precipitation, aggregate formation or thickening was indicated as x.
(註 19) Test material: A coating film having a wet film thickness of 250 μm was formed on a glass plate, and the temperature was 23 ° C.
Test under conditions of 50% humidity.
The test method is to use a 15.8kg test roll with a synthetic rubber soft tire specified in JIS-K-5665 and roll it on the coating film until the coating film does not adhere to the tire after painting. Test the drying time. The drying time is preferably within 15 minutes.
(註 20) Test material: A coating film having a wet film thickness of 250 μm is formed on an asphalt block and dried for one week under conditions of a temperature of 23 ° C. and a humidity of 50%.
Test method: The adhesion strength is measured according to the JIS-A6909 adhesion strength test.
The numerical value is 1.0 N / mm ² or more, or “◯” when the ground is broken, and “X” otherwise.
(Note 21) Test material: A coating film having a wet film thickness of 250 μm was formed on a glass plate, and the temperature was 23 ° C.
And dried for 72 hours at a humidity of 50%.
Test method: Evaluated by a water immersion test at a temperature of 23 ° C. for 24 hours. A film having no abnormality in the appearance of the coating film was indicated as “◯”, and a film having an abnormality was indicated as “X”.
(註 22) Test material: Same as 註 21.
Test method: Evaluated by immersion for 18 hours at a temperature of 23 ° C and a saturated aqueous solution of calcium hydroxide
. A film having no abnormality in the appearance of the coating film was indicated as “◯”, and a film having an abnormality was indicated as “X”.
(Note 23) Test material: A coating film having a wet film thickness of 500 μm is formed on a slate plate and dried for 7 days under conditions of a temperature of 23 ° C. and a humidity of 50%.
Test method: In the accelerated weather resistance of JIS K 5600-7-7, the color difference (ΔE) from the initial stage after irradiation for 600 hours was calculated.
(註 24) Test material: It is applied to a slate plate with a roller (0.8 kg / m ^{2 when} applied twice) and cured for 7 days under conditions of a temperature of 23 ° C. and a humidity of 50%.
Test method: Using a pendulum skid resistance tester, the sliding resistance (BPN value) on the WET surface is measured. 40 or more is preferable.
(Note 25) Test material: A coating film having a dry film thickness of 500 μm is formed on asphalt felt paper, and dried for 72 hours under conditions of a temperature of 23 ° C. and a humidity of 50%.
Measuring method: The solar reflectance at 780 nm to 2500 nm of the dried coating film is measured in minutes.
Measured using a photometer (manufactured by JASCO: V-570), JIS A 575
The solar reflectance is calculated by a method according to 9.

  The use of the coating composition of the present invention is not particularly limited, such as iron parts, building rooftops, roads, etc., but it is particularly applicable to building rooftops and roads, and has excellent drying properties and excellent heat shielding. The characteristic can be exhibited.

Claims (8)

(1) (A) an aqueous dispersion base resin obtained by polymerizing an α, β-ethylenically unsaturated monomer containing 50% by weight or more of an acrylic ester or methacrylic ester, (B) an allyl group-containing resin Essential components include an amine polymer obtained by polymerizing a secondary or tertiary amine, (C) an excess of a volatile base from the amino group of the amine polymer (B), (D) a heat-shielding pigment, and (E) white silica. In the quick-drying water-based coating composition, the heat-shielding pigment (D) is JIS
The solar reflectance in the near-infrared region (780-2500 nm) calculated | required by K5602 is 30.
% Of the azo-based black pigment (D1) of 0.001 to 5% by weight in the total paint, and the near-infrared reflective pigment (D2) other than (D1), which is the heat-shielding pigment (D), in the total paint. White silica (E) having a particle size of 001 to 20% by weight and a particle size of 0.3 to 1 mm is contained in a total coating amount of 20 to 60% by weight;
A quick-drying thermal barrier water-based paint composition for roads, wherein the solar reflectance in the near-infrared region (780-2500 nm) of the coating film determined by SK 5602 is from 50% to 77%. The near-infrared reflective pigment (D2) other than (D1) is one or two selected from the group consisting of titanium oxide, azo pigments, benzimidazolone pigments, quinacridone pigments, copper phthalocyanine blue pigments, and metal-free phthalocyanine blue pigments The quick-drying heat-insulating water-based paint composition for roads according to claim 1, comprising the above pigment. The aqueous dispersion base resin (A) has an average particle size of 50 to 200 nm and a standard deviation of the particle size of 10
The quick-drying thermal barrier water-based paint composition for roads according to claim 1 or 2, wherein the composition is 0 nm or less. The quick-drying heat-insulating water-based paint for roads according to any one of claims 1 to 3, wherein the amine polymer (C) is obtained by polymerizing an amine containing two allyl groups. Composition. The quick-drying thermal barrier water-based paint composition for roads according to any one of claims 1 to 4, wherein the amine polymer (C) is neutralized with an organic acid. 6. The quick-drying thermal barrier water-based paint composition for road according to claim 5, wherein the neutralized organic acid of the amine polymer (C) is formic acid or acetic acid. 7. The quick-drying road barrier according to claim 1, wherein the dryness of the aqueous coating composition is within 15 minutes in a tire adhesion test of 8.12 of JIS K5665. Hot water paint composition. The quick-drying heat-insulating water-based paint composition for roads according to any one of claims 1 to 7, wherein the sliding resistance of the water-based paint composition is 40 or more with a pendulum skid resistance tester. .