JP5204142B2 - Thermal barrier coating composition - Google Patents
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本発明は、遮熱性塗料組成物、特に、アスファルト舗装面等に遮熱性塗膜を形成するのに好適な新規な熱溶融型の遮熱性塗料組成物に関する。 The present invention relates to a heat-shielding coating composition, and more particularly to a novel heat-melting type heat-shielding coating composition suitable for forming a heat-shielding coating film on an asphalt pavement surface or the like.
ここでは、アスファルト舗装面を主として例に採り説明するが、他のコンクリート舗装面、さらには、建築物屋上舗装面等にも適用して、ヒートアイランド現象を防止できるものである。 Here, asphalt pavement surface is mainly described as an example, but it can also be applied to other concrete pavement surfaces, and further roof pavement surfaces of buildings, etc., to prevent the heat island phenomenon.
道路舗装に多いアスファルト舗装は黒色であるため太陽光エネルギーを吸収しやすく、夏の路面温度が高くなりやすい。土、緑地等のように水の吸収と発散のないアスファルト舗装が多い都市部では、熱の吸収蓄熱の増大、反射率の低下により路面温度が高くなり、環境温度も高くなる。夏季には特に顕著となり、夜になっても気温が低くならずにヒートアイランド現象が問題となっている。 Asphalt pavement, which is common in road pavements, is black, so it easily absorbs solar energy and tends to have high summer road surface temperatures. In urban areas where there is a lot of asphalt pavement that does not absorb and diverge water, such as soil and green spaces, the road surface temperature increases and the environmental temperature also increases due to an increase in heat absorption and heat storage and a decrease in reflectance. It becomes particularly noticeable in summer, and the heat island phenomenon is a problem because the temperature does not decrease even at night.
道路舗装等を原因とするヒートアイランド現象の防止対策としては、遮熱性塗料を舗装面に塗布して遮熱性塗膜を形成することが考えられる。 As a countermeasure for preventing the heat island phenomenon caused by road pavement or the like, it is conceivable to form a heat-shielding coating film by applying a heat-shielding paint to the pavement surface.
例えば、特許文献１では、「速乾性の水性樹脂組成物と１種または２種以上の赤外線反射顔料とを含有し、波長３５０〜２１００ｎｍの波長域における塗膜の日射反射率が３０％以上であることを特徴とする速乾性の遮熱水性塗料組成物。」が提案されている（請求項１等）。そして、該遮熱水性塗料組成物は、「常乾型かつ極めて速乾性であり、遮熱性に優れ、塗膜物性も優れている。そのため、主として建物の外装および内装用途、フロア用途、鉄部材用途あるいは道路用途に使用でき、特にアスファルト密着性に優れるため、道路用途に好適に使用できる。」旨、効果の項に記載されている（段落００１４）。 For example, in Patent Document 1, “a fast-drying aqueous resin composition and one or more infrared reflection pigments are contained, and the solar reflectance of the coating film in the wavelength range of 350 to 2100 nm is 30% or more. A quick-drying heat-insulating water-based paint composition characterized in that "has been proposed (claim 1 etc.). The thermal barrier water-based coating composition is “normally dry and extremely quick-drying, excellent in thermal barrier properties, and excellent in coating film properties. Therefore, mainly for building exterior and interior applications, floor applications, iron It can be used for member applications or road applications, and is particularly suitable for road applications because of its excellent asphalt adhesion, "the effect section (paragraph 0014).
また、特許文献２では、「舗装体の表層の表面に硬化型樹脂液を塗布する方法において、硬化型樹脂液としてラジカル架橋型の２液常温硬化型樹脂液を用いると共に、該２液常温硬化型樹脂液を構成する有機過酸化物を含有する樹脂液及び有機過酸化物を含有しない樹脂液のいずれか一方の樹脂液を舗装体の表面に塗布し、かくして形成された一方の樹脂液からなる塗膜状物の上に他方の樹脂液を塗布することを特徴とする舗装体の表面処理方法」において、「樹脂液が可視波長域で吸収を示し赤外線波長域では反射を示す顔料を含有する」構成が提案されている（請求項１・３）。 Further, in Patent Document 2, “in the method of applying a curable resin liquid to the surface of a pavement surface layer, a radical crosslinking type two-component room temperature curable resin solution is used as the curable resin solution, and the two-component room temperature curable resin is cured The resin liquid containing the organic peroxide that constitutes the mold resin liquid and the resin liquid not containing the organic peroxide are applied to the surface of the pavement, and the thus formed resin liquid In the surface treatment method of a paving body, characterized in that the other resin liquid is applied onto the coating-like material to be formed, containing "a pigment that shows absorption in the visible wavelength range and reflection in the infrared wavelength range" A configuration is proposed (claims 1 and 3).
しかし、上記特許文献１・２で提案されている遮熱性塗料組成物では、昨今の道路開放のための時間をできるだけ短くする要請に応え難いと考えられる。 However, the thermal barrier coating compositions proposed in Patent Documents 1 and 2 are considered difficult to meet the recent demand for shortening the time for road opening as much as possible.
即ち、特許文献２の実施例では、第１液を塗布３０分経過後、第２液をその上に塗布後１５分の硬化時間が必要であり（段落００２４）、また、特許文献１の塗料組成物では、速乾性がＪＩＳ Ｋ５６６５のタイヤ付着性試験で１５分以内であり（請求項７）、実施例でも、乾燥時間：１２〜１４分と依然として長い。 That is, in the example of Patent Document 2, a curing time of 15 minutes is required after the first liquid is applied for 30 minutes and the second liquid is applied thereon (paragraph 0024). In the composition, the quick-drying property is within 15 minutes in the tire adhesion test of JIS K5665 (Claim 7), and even in the examples, the drying time is still as long as 12 to 14 minutes.
さらには、特許文献１・２は、合成樹脂系塗料であるため、厚塗り（１ｍｍ以上）を予定していない。例えば、特許文献２では、乾燥膜厚５００μｍ（段落００４６（註２３））である。このため、耐摩耗性（耐久性）に問題が発生し易いと考えられる。 Furthermore, since Patent Documents 1 and 2 are synthetic resin paints, thick coating (1 mm or more) is not planned. For example, in Patent Document 2, the dry film thickness is 500 μm (paragraph 0046 (註 23)). For this reason, it is thought that a problem is likely to occur in wear resistance (durability).
本発明は、上記にかんがみて、乾燥時間が短く、且つ、耐摩耗性にも問題が発生し難くて、アスファルト舗装面等に遮熱性を付与する遮熱性塗膜を形成するのに好適な新規な構成の遮熱性塗料組成物を提供することを目的とする。 In view of the above, the present invention is a novel material suitable for forming a heat-shielding coating film that imparts heat-shielding properties to an asphalt pavement surface, etc., having a short drying time and hardly causing problems in wear resistance. An object of the present invention is to provide a heat-shielding coating composition having a simple structure.
本発明者らは、上記課題を解決するために、鋭意開発に努力をする過程で、下記構成とすれば、上記課題を解決できることを知見して、下記構成の遮熱性塗料組成物に想到した。 In order to solve the above-mentioned problems, the inventors have devised a heat-shielding coating composition having the following structure by knowing that the above-described problems can be solved if the following structure is used in the process of earnest development. .
熱可塑性結合材（粘着付与材）をマトリックスとし、白色系又は透明な硬質骨材（ガラスビーズを除く。）、体質材、可塑剤及び赤外線反射顔料を必須成分とする熱溶融型の遮熱性塗料組成物であって、
前記熱可塑性結合材の色相（ガードナー法）８以下であり、
該配合組成が、熱可塑性結合材（粘着付与材）：１０〜２５質量％、硬質骨材：１０〜２０質量％、体質材：３０〜６５質量％、可塑剤：0.５〜５質量％、赤外線反射顔料：0.25〜５質量％であるとともに、
前記赤外線反射顔料の構成顔料の日射反射率の最低値が１５％以上である、ことを特徴とする。
Hot-melt type heat-shielding paint with thermoplastic binder (tackifier) as matrix and white or transparent hard aggregate (excluding glass beads) , extender, plasticizer and infrared reflective pigment as essential components A composition comprising:
The hue of the thermoplastic binder (Gardner method) is 8 or less,
The blend composition is thermoplastic binder (tackifier): 10-25% by mass, hard aggregate: 10-20% by mass, extender: 30-65% by mass, plasticizer: 0.5-5% by mass , infrared reflective pigment: with a 0.25 to 5% by weight,
The minimum value of the solar reflectance of the constituent pigment of the infrared reflective pigment is 15% or more .
熱可塑性結合材の色相（ガードナー法）８以下とするとともに、赤外線反射顔料を含有させることにより、協働して遮熱性が格段に向上することを知見して本発明に想到した。 The inventors of the present invention have come up with the present invention by discovering that the heat-shielding property is greatly improved in cooperation with the thermoplastic binder having a hue (Gardner method) of 8 or less and containing an infrared reflective pigment.
上記のごとく、前記硬質骨材、体質材および可塑剤が淡色系である。塗膜の調色が容易になるとともに、日射反射率の低下を抑制できる。 As indicated above, the hard aggregates, extender materials and plasticizer Ru light color der. Toning of the coating film is facilitated, and a decrease in solar reflectance can be suppressed.
本発明の課題は、上記発明と対応する特別な技術的特徴を有する下記発明によっても解決できる。
熱可塑性結合材（粘着付与材）をマトリックスとし、白色又は透明な硬質骨材、体質材、可塑剤及び赤外線反射顔料を必須成分とする熱溶融型の遮熱性塗料組成物であって、
前記熱可塑性結合材の色相（ガードナー法）８以下であり、
該配合組成が、熱可塑性結合材（粘着付与材）：１０〜２５質量％、硬質骨材：１０〜２０質量％、体質材：３０〜６５質量％、可塑剤：0.５〜５質量％、赤外線反射顔料：0.25〜５質量％であるとともに、
前記体質材の一部が無機中空微粒子に置換され、該無機中空微粒子の配合組成が、配合組成全量中５〜２５質量%（望ましくは１０〜２０質量％）であり、さらに、
前記赤外線反射顔料の構成顔料の日射反射率の最低値が１５％以上である、
ことを特徴とする。
The problems of the present invention can also be solved by the following invention having special technical features corresponding to the above invention.
A hot-melt type thermal barrier coating composition comprising a thermoplastic binder (tackifier) as a matrix and white or transparent hard aggregate, extender, plasticizer and infrared reflective pigment as essential components,
The hue of the thermoplastic binder (Gardner method) is 8 or less,
The blend composition is thermoplastic binder (tackifier): 10-25% by mass, hard aggregate: 10-20% by mass, extender: 30-65% by mass, plasticizer: 0.5-5% by mass Infrared reflective pigment: 0.25-5% by mass ,
Part of the extender is replaced with inorganic hollow fine particles, and the composition of the inorganic hollow fine particles is 5 to 25% by mass (preferably 10 to 20% by mass ) in the total amount of the compounded composition ,
The minimum value of the solar reflectance of the constituent pigment of the infrared reflective pigment is 15% or more,
It is characterized by that.
上記本発明は、前記発明における効果に加えて、塗膜の熱伝達率が低下して舗装面の温度上昇が抑制される。 In the present invention, in addition to the effects of the invention, the heat transfer coefficient of the coating film is reduced and the temperature increase of the paved surface is suppressed.
上記各構成の遮熱性塗料組成物は、赤外線反射顔料の構成顔料の日射反射率が２０％以上であることが望ましい。通常、調色のために複数の顔料を組み合わせるが、そのときの塗膜の日射反射率は、加重平均とはならず、低い方の日射反射率に依存することを本発明者らは確認している。 The heat shielding paint composition of each component, it is desirable solar reflectance configuration pigment infrared reflective pigment is 20% or more. Usually, a plurality of pigments are combined for toning, and the present inventors have confirmed that the solar reflectance of the coating film at that time is not a weighted average but depends on the lower solar reflectance. ing.
さらに、上記各構成の遮熱性塗料組成物において、硬質骨材が、モース硬さ５以上、さらにはモース硬さ６以上のものであることが望ましい。特に、珪石粉は、モース硬さ７と他の硬質骨材に比して硬くて耐摩耗性（耐久性）に優れた塗膜を得易いとともに、白色度が高くて、前述と同様、塗膜の色相に影響を与え難いとともに日射反射率の低下抑制にも寄与する。 Furthermore, in the heat-shielding coating composition having the above-described configurations, it is desirable that the hard aggregate has a Mohs hardness of 5 or more, and further a Mohs hardness of 6 or more. In particular, silica powder is harder than Mohs hardness 7 and other hard aggregates, and it is easy to obtain a coating film excellent in wear resistance (durability) and has high whiteness. It hardly affects the hue of the film and contributes to the suppression of the decrease in solar reflectance.
上記各構成の塗料組成物を用いての密粒度アスファルト系舗装（半たわみ性舗装を含む。）、モルタルコンクリート舗装などのコンクリート系舗装面上に遮熱性塗膜を形成する方法は、遮熱性塗料組成物を溶融塗布して0.5〜３ｍｍの遮熱性塗膜を形成する構成となり、さらには、前記遮熱性塗料組成物を溶融塗布した後、該塗膜の硬化前に滑り止め粒体を散布する構成とすることが望ましい。 A method for forming a heat-shielding coating film on a concrete-type pavement surface such as dense-graded asphalt pavement (including semi-flexible pavement) and mortar concrete pavement using the paint composition of each of the above constitutions The composition is melt-coated to form a heat-shielding coating film of 0.5 to 3 mm. Further, after the heat-shielding coating composition is melt-coated, anti-slip particles are sprayed before the coating film is cured. It is desirable to have a configuration.
滑り止め粒体を散布することで、舗装面の滑り止め性を増大させることができる。 By spreading the non-slip particles, the anti-slip property of the pavement surface can be increased.
本発明の遮熱性塗料組成物は、従来のアスファルト舗装より、後述の遮熱性試験において、表面温度を略１１〜１８℃低下させることができた。その効果により、アスファルトやコンクリートの舗装面の熱の吸収蓄熱を防止し環境温度を低下することができ、ヒートアイランド現象の抑制が期待できる。そして、本発明の遮熱性塗料組成物は、道路舗装面ばかりでなく、屋上舗装面にも適用でき、ヒートアイランド現象の抑制への寄与も期待できる。 The thermal barrier coating composition of the present invention was able to lower the surface temperature by about 11 to 18 ° C. in the thermal barrier test described later than conventional asphalt pavement. Due to this effect, heat absorption and storage of asphalt and concrete paving surfaces can be prevented and the environmental temperature can be lowered, and the suppression of the heat island phenomenon can be expected. The heat-shielding coating composition of the present invention can be applied not only to road pavement surfaces but also to roof pavement surfaces, and can be expected to contribute to the suppression of the heat island phenomenon.
以下、本発明の実施形態について説明する。なお、以下の説明で配合組成を示す「％」は、特に断らない限り「質量％」を意味する。 Hereinafter, embodiments of the present invention will be described. In the following description, “%” indicating the composition means “% by mass” unless otherwise specified.
本発明の遮熱性塗料組成物は、熱可塑性結合材（粘着付与材）をマトリックスとし、硬質骨材、体質材、可塑剤及び赤外線反射顔料を必須成分とする熱溶融型のものである。 The heat-shielding coating composition of the present invention is a heat-melting type composition having a thermoplastic binder (tackifier) as a matrix and hard aggregates, extenders, plasticizers, and infrared reflective pigments as essential components.
そして、上記熱可塑性結合材は、施工温度（たとえば２００℃）で施工可能な粘度を有し、且つ、色相（ガードナー法）８以下（望ましくは６以下）であるものなら特に限定されない。施工温度２００℃における施工可能な粘度とは、粘性率が0.５〜2.６ dPa（望ましくは1.０〜2.０dPa）をいう。 The thermoplastic binder is not particularly limited as long as it has a viscosity that can be applied at an application temperature (for example, 200 ° C.) and has a hue (Gardner method) of 8 or less (preferably 6 or less). The workable viscosity at a construction temperature of 200 ° C. means that the viscosity is 0.5 to 2.6 dPa (preferably 1.0 to 2.0 dPa).
例えば、脂肪族系石油樹脂；ポリブテン等の石油系炭化水素樹脂；クマロン・インデン樹脂等のクマロン系樹脂；フェノール・ホルムアルデヒド樹脂等のフェノール系樹脂；テルペン・フェノール樹脂、ポリテルペン樹脂等のテルペン系樹脂；合成ポリテルペン樹脂；芳香族系炭化水素樹脂；不飽和炭化水素重合体；イソプレン系樹脂；水素添加炭化水素樹脂；炭化水素系粘着化樹脂；水素添加ロジン、水素添加ロジンのエステル樹脂、重合ロジン、硬化ロジン等のロジン誘導体等が使用可能である。 For example, aliphatic petroleum resins; petroleum hydrocarbon resins such as polybutene; coumarone resins such as coumarone and indene resins; phenol resins such as phenol and formaldehyde resins; Synthetic polyterpene resin; aromatic hydrocarbon resin; unsaturated hydrocarbon polymer; isoprene-based resin; hydrogenated hydrocarbon resin; hydrocarbon-based tackifying resin; hydrogenated rosin, ester resin of hydrogenated rosin, polymerized rosin, curing A rosin derivative such as rosin can be used.
上記熱可塑性結合材のうち、脂肪族系石油樹脂又は石油系炭化水素樹脂であることが望ましい。これらは、他の熱可塑性結合材に比して、より淡色のもの（色相（ガードナー法）６以下）を安定して得易く、コスト的にも安定しているためである。 Of the thermoplastic binders, an aliphatic petroleum resin or a petroleum hydrocarbon resin is desirable. These are because it is easy to stably obtain a lighter color (hue (Gardner method) 6 or less) as compared with other thermoplastic binders, and is also stable in terms of cost.
また、熱可塑性結合材の配合組成は、１０〜２５％、さらには、１３〜２３％が望ましい。配合組成が過少では、粘性率が高くて良好な流動性が得難く施工性（作業性）が低下し、他方、過多では、耐汚染性が低下したり、溶融時に体質材、硬質骨材が沈降したりして、綺麗な塗膜を得難い。 Further, the blending composition of the thermoplastic binder is preferably 10 to 25%, and more preferably 13 to 23%. If the blending composition is too small, the viscosity is high and it is difficult to obtain good fluidity and workability (workability) is lowered. On the other hand, if it is too much, the stain resistance is lowered, or the body material and hard aggregate are not melted. It is difficult to obtain a beautiful coating film due to settling.
硬質骨材としては、塗膜に耐摩耗性および滑り止め性を付与できるモース硬さ５以上の粗粒子（0.１〜２ｍｍ）であれば特に限定されないが、耐摩耗性（耐久性）の見地から、モース硬さ６以上、平均粒径0.３〜0.７ｍｍが望ましく、着色上および日射反射率を低下させない見地から、通常、淡色系のものを使用することが望ましい。ここで、淡色系とは、白色系、淡黄色系、乃至透明系を意味する。 The hard aggregate is not particularly limited as long as it is a coarse particle (0.1 to 2 mm) having a Mohs hardness of 5 or more that can impart wear resistance and anti-slip properties to the coating film, but it has wear resistance (durability). From the viewpoint, it is desirable that the Mohs hardness is 6 or more and the average particle diameter is 0.3 to 0.7 mm. From the viewpoint of not coloring and reducing the solar reflectance, it is usually desirable to use a light-colored one. Here, the light color system means a white system, a light yellow system, or a transparent system.
例えば、珪石粉、アルミナ粉及びガラス粉（石英ガラス、ソーダ石灰系、チタン-バリウム系など）、さらには、日射エネルギーで暖まりにくい成分を含むセラミック骨材等の内から１種又は２種以上を適宜選択して使用することができる。特に、白色度や透明度が高く、モース硬さも大きい珪石粉（モース硬さ７）やガラスビーズ（モース硬さ６〜７）等を好適に使用できる。 For example, silica powder, alumina powder and glass powder (quartz glass, soda lime system, titanium-barium system, etc.), and ceramic aggregates containing components that are not easily warmed by solar energy, etc. It can be appropriately selected and used. In particular, silica stone powder (Mohs hardness 7), glass beads (Mohs hardness 6-7), etc., which have high whiteness and transparency and high Mohs hardness, can be suitably used.
硬質骨材の配合組成は１０〜２０％、さらには、１２〜１８％が望ましい。 The composition of the hard aggregate is preferably 10 to 20%, more preferably 12 to 18%.
硬質骨材の配合組成が過少では、塗膜摩耗の途中での塗膜に、必要な滑り止め性が得難いとともに、耐摩耗性も低下する（塗膜耐久性が低下する。）。硬質骨材の配合組成が過多では、溶融時の液相比率が低下して粘度が増大し、溶融時に必要な流動性を得難くなり、塗布作業性が低下する（良好な塗膜外観を得難い。）。結果として、耐衝撃性や接着性も悪くなる。 If the composition of the hard aggregate is too small, it is difficult to obtain the necessary anti-slip property for the coating film in the middle of coating film wear, and the wear resistance is also decreased (coating film durability is decreased). If the composition of the hard aggregate is excessive, the liquid phase ratio at the time of melting will decrease and the viscosity will increase, making it difficult to obtain the required fluidity at the time of melting, and the coating workability will deteriorate (it is difficult to obtain a good paint film appearance) .) As a result, impact resistance and adhesiveness also deteriorate.
体質材としては、塗膜に適度の強度を確保できる無機充填材であれば特に限定されないが、硬質骨材の場合と同様、着色上および日射反射率の低下を抑制する見地から、通常、淡色系（白色度が高い）のものを使用する。 The extender is not particularly limited as long as it is an inorganic filler that can ensure an appropriate strength for the coating film, but, as in the case of a hard aggregate, it is usually a light color from the standpoint of suppressing the reduction of the color reflectance and solar reflectance. System (high whiteness) is used.
具体的には、炭酸カルシウム、タルク、硫酸バリウム等の内から１種又は２種以上、適宜選択して使用できる。そして、体質材は、微粒子（平均粒子径：１〜１０μm）と粗粒子（平均粒径：0.１〜１ｍｍ）とを１０／９０〜７０／３０の混合粉体とすることが好ましい。粗粒子間に微粒子が入り込んで塗膜強度を確保し易い。 Specifically, one or more of calcium carbonate, talc, barium sulfate and the like can be appropriately selected and used. The extender is preferably a mixed powder of 10/90 to 70/30 of fine particles (average particle size: 1 to 10 μm) and coarse particles (average particle size: 0.1 to 1 mm). Fine particles enter between the coarse particles, and it is easy to ensure the coating strength.
体質材の配合組成は、３０〜６５％、さらには、３５〜６５％が望ましい。 The composition of the extender is preferably 30 to 65%, more preferably 35 to 65%.
過少であると耐汚染性が低下したり、溶融時に硬質骨材、体質材が沈降したりしやすくなる。過多であると、硬質骨材の場合と同様、溶融時の粘度が高く流動性が得られないため塗布作業性が低下する。また耐衝撃性や接着性も悪くなる。 If the amount is too small, the stain resistance is lowered, and the hard aggregate and the extender are liable to settle during melting. If the amount is excessive, as in the case of the hard aggregate, the viscosity at the time of melting is high and the fluidity cannot be obtained, so that the coating workability is lowered. Moreover, impact resistance and adhesiveness also deteriorate.
必然的ではないが、上記体質材の一部を、塗膜の熱伝達率低下のために、無機中空微粒子に置換してもよい。無機中空微粒子の配合組成は、５〜２５％、望ましくは、５〜１５％とする。無機中空微粒子が過少では、塗膜の熱伝達率低下による舗装面の温度上昇の抑制作用を奏し難く、過剰であると、体質材の比率が低下して、コスト的に不利である。また、無機中空微粒子は塗膜成分となったとき圧潰（破砕）し易く、結果的に耐摩耗性が低下する（塗膜耐久性が低下する。）。 Although not necessarily, a part of the above-mentioned constitution material may be replaced with inorganic hollow fine particles in order to reduce the heat transfer coefficient of the coating film. The compounding composition of the inorganic hollow fine particles is 5 to 25%, preferably 5 to 15%. If the amount of inorganic hollow fine particles is too small, it is difficult to suppress the increase in temperature of the paved surface due to a decrease in the heat transfer coefficient of the coating film, and if it is excessive, the proportion of the extender is reduced, which is disadvantageous in cost. Further, when the inorganic hollow fine particles become a coating film component, they are easily crushed (crushed), resulting in a decrease in wear resistance (coating film durability is decreased).
無機中空微粒子としては、例えば、ガラスバルーン、セラミックバルーン、シリカバルーン、シラスバルルーン、フライアッシュバルーン、等のうちから１種又は２種以上を選択して使用することができる。特に、ガラスバルーンやセラミックバルーンで、それらの粒径が１〜２００μｍのものを好適に使用できる。 As the inorganic hollow fine particles, for example, one or more kinds selected from glass balloons, ceramic balloons, silica balloons, shirasu baluns, fly ash balloons, and the like can be selected and used. In particular, glass balloons and ceramic balloons having a particle diameter of 1 to 200 μm can be used preferably.
上記のうち、淡色系のものを使用することが着色上および日射反射率の低下抑制の見地から望ましい。 Among the above, it is desirable to use a light-colored one in terms of coloring and suppression of a decrease in solar reflectance.
可塑剤としては、フタル酸エステル類、大豆油等の植物油、植物油変性アルキド樹脂、エポキシ化油、液状合成ゴム類、鉱物油（ナフテン系、パラフィン系、オレフィン系）等の内から１種又は２種以上、適宜選択して使用することができる。特に、フタル酸エステル類（アルキル炭素数６〜１２）や植物油変性アルキド樹脂が望ましい。淡色系で可塑化効率が良好であるとともに、２００℃前後の高温でも変色や揮発が少ないためである。 As the plasticizer, one or two of phthalates, vegetable oil such as soybean oil, vegetable oil-modified alkyd resin, epoxidized oil, liquid synthetic rubber, mineral oil (naphthenic, paraffinic, olefinic), etc. More than one species can be appropriately selected and used. In particular, phthalic acid esters (alkyl 6 to 12) and vegetable oil-modified alkyd resins are desirable. This is because the plasticizing efficiency is good in a light color system, and there is little discoloration and volatilization even at a high temperature around 200 ° C.
可塑剤の配合組成は、0.5〜５％、さらには、１〜３％が望ましい。配合組成が過少では、耐衝撃性及び接着性において問題が発生し易く、他方、過多では、耐汚染性及び乾燥性に問題が発生し易い。 The compounding composition of the plasticizer is preferably 0.5 to 5%, and more preferably 1 to 3%. If the blending composition is too small, problems are likely to occur in impact resistance and adhesiveness, while if it is excessive, problems are likely to occur in stain resistance and drying properties.
赤外線反射顔料とは、「波長領域約800nm以上で高い反射を示す顔料」を意味し、以下のような有機系顔料乃至無機系顔料がある。なお、日射反射率の分かっている顔料については、併記した。 The infrared reflective pigment means “a pigment exhibiting high reflection in a wavelength region of about 800 nm or more”, and includes the following organic pigments or inorganic pigments. Note that pigments with known solar reflectance are also shown.
＜白＞ 日射反射率（％）
酸化チタン ８３〜８９
亜鉛華
酸化マグネシウム
酸化カルシウム
酸化バリウム
＜黒＞
鉄、クロムの複合酸化物 ２１〜２４
銅、マグネシウムの複合酸化物
銅、ビスマスの複合酸化物 ２９
鉄、クロム、コバルトの複合酸化物、 ２３
＜赤＞
キナクリドンレッド ５４
亜鉛、鉄、クロムの複合酸化物 ３８
酸化第二鉄 ２０〜２８
＜青＞
シアニンブルー
ジオキサジンバイオレット
コバルト、アルミニウムの複合酸化物 ４２〜４７
コバルト、アルミニウム、クロムの複合酸化物 ３１
＜黄＞
ビスマス、バナジウム、アルミニウムの複合酸化物 ７３
ニッケル、バリウム、チタンの複合酸化物 ６６
ニッケル、アンチモン、チタンの複合酸化物 ７２
＜緑＞
コバルト、ニッケル、亜鉛の複合酸化物 ２７
コバルト、ニッケル、チタン、亜鉛の複合酸化物 ２１〜２５
上記のうち日射反射率が高いものが望ましい。
<White> Solar reflectance (%)
Titanium oxide 83-89
Zinc flower Magnesium oxide Calcium oxide Barium oxide <Black>
Complex oxides of iron and chromium 21-24
Composite oxide of copper and magnesium
Composite oxide of copper and bismuth 29
Complex oxide of iron, chromium and cobalt, 23
<Red>
Kinacridon Red 54
Complex oxide of zinc, iron and chromium 38
Ferric oxide 20-28
<Blue>
Cyanine blue Dioxazine violet Cobalt and aluminum composite oxide 42-47
Cobalt, aluminum and chromium composite oxide 31
<Yellow>
Bismuth, vanadium, aluminum complex oxide 73
Nickel, barium, titanium composite oxide 66
Nickel, antimony, titanium composite oxide 72
<Green>
Cobalt, nickel, zinc composite oxide 27
Cobalt, nickel, titanium, zinc composite oxide 21-25
Of these, those with high solar reflectance are desirable.
ここで、赤外線反射顔料の配合組成は、要求日射反射率に応じて異なるが、0.25〜５％、さらには、0.5〜４％が望ましい。 Here, the composition of the infrared reflective pigment varies depending on the required solar reflectance, but is preferably 0.25 to 5%, and more preferably 0.5 to 4%.
さらに、その他の添加剤として、適宜、沈降防止剤、表面改質剤、汚れ防止剤及び流動性付与剤等を配合することができる。具体的には、添加剤として、ポリエチレンワックス等が好適に使用できる。 Furthermore, as other additives, an anti-settling agent, a surface modifier, an antifouling agent, a fluidity-imparting agent, and the like can be appropriately blended. Specifically, polyethylene wax or the like can be suitably used as an additive.
ポリエチレンワックスの配合組成は、１〜５％、さらには、２〜３％が望ましい。過多であると硬質骨材、体質材が沈降しやすくなり、無機中空微粒子が表面に浮きあがりやすくなる。耐汚染性も悪くなる。 The blending composition of the polyethylene wax is preferably 1 to 5%, and more preferably 2 to 3%. If the amount is excessive, the hard aggregate and the constitution material are likely to settle, and the inorganic hollow fine particles are likely to float on the surface. The contamination resistance also deteriorates.
通常、遮熱性塗料組成物を溶融塗布した後、該塗膜の硬化前に滑り止め粒体を散布する。塗布手段としては、スリッター式塗布機やロータ式塗布機を用いて、アスファルト塗装面等に塗布して遮熱性塗膜の施工を行う。このとき、加熱溶融温度は、200℃前後とする。 Usually, after the heat-shielding coating composition is melt-coated, anti-slip particles are sprayed before the coating film is cured. As a coating means, using a slitter type coater or a rotor type coater, it is applied to an asphalt coated surface or the like to apply a heat-shielding coating film. At this time, the heating and melting temperature is about 200 ° C.
そして、滑り止め粒体としては、粒子径：0.１〜２ｍｍものを使用することができる。具体的には、前述の硬質骨材のうち大粒径のものを使用できる。特に、珪石粉、アルミナ粉、ガラス粉、さらには、表面に日射エネルギーで暖まりにくい成分を含むセラミック粉を適宜、１種又は２種以上を選択して使用することもできる。 And as a non-slip | skid granule, a particle diameter: 0.1-2 mm thing can be used. Specifically, those having a large particle size among the above-mentioned hard aggregates can be used. In particular, silica powder, alumina powder, glass powder, and ceramic powder containing a component that is difficult to be warmed by solar energy on the surface may be appropriately selected and used.
なお、滑り止め粒体の散布量は、0.３〜１kg／ｍ２、さらには、0.５〜0.８kg／ｍ２とすることが望ましい。 The application amount of the non-slip granules is preferably 0.3 to 1 kg / m 2 , and more preferably 0.5 to 0.8 kg / m 2 .
以下、本発明を実施例に基づいて更に詳細に説明する。 Hereinafter, the present invention will be described in more detail based on examples.
＜塗料の調製＞
表１に示す処方の塗料組成物（1.０〜2.０kg）をホーロー鍋に少しずつ加え、ガスコンロで２０分程度かけて、温度が、180±20℃になるように加熱溶融する。その際、局部加熱を起こさないよう、ステンレススプーンでかき混ぜる。
<Preparation of paint>
A coating composition (1.0 to 2.0 kg) having the formulation shown in Table 1 is gradually added to the enamel pan, and heated and melted with a gas stove for about 20 minutes so that the temperature becomes 180 ± 20 ° C. At that time, stir with a stainless steel spoon to prevent local heating.
なお、表１における各顔料名の後の括弧内の数値は、日射反射率を示す。 In Table 1, the numerical value in parentheses after each pigment name indicates solar reflectance.
＜試験体の調製＞
下記仕様の密粒度アスファルトコンクリートブロック（180×180×30mm）の上面（180×180mmの面）に厚さ1.7mmで各塗料を塗布した。そして、硬化前に珪石粉を塗膜表面に散布固着させたものを試験体とした。
<Preparation of specimen>
Each paint was applied to a top surface (180 × 180 mm surface) of a dense grained asphalt concrete block (180 × 180 × 30 mm) having the following specifications with a thickness of 1.7 mm. And the thing which sprinkled and fixed silica powder on the coating-film surface before hardening was made into the test body.
＜コンクリートブロック仕様＞
舗装用アスファルト １０容量％
粗骨材（砕石等） ３４容量％
細骨材（砂） ４７容量％
フィラー（石粉） ５容量％
空隙 ４容量％、
＜塗膜乾燥時間＞
各試験体に対して、ＪＩＳ―Ｋ５６６５で規定された合成ゴム製の柔らかいタイヤを有する、重さ15.８ｋｇの試験ロールを使用して塗膜上を転がし、塗装後タイヤに塗膜が付着しなくなるまでの乾燥時間を求めた。
<Concrete block specification>
Asphalt for paving 10% by volume
Coarse aggregate (crushed stone, etc.) 34% by volume
Fine aggregate (sand) 47% by volume
Filler (stone powder) 5% by volume
Void 4% by volume,
<Coating film drying time>
Each test specimen was rolled over the paint film using a 15.8 kg test roll with a synthetic rubber soft tire specified in JIS-K5665, and the paint film adhered to the tire after painting. The drying time until it disappeared was determined.
＜遮熱性試験＞
上記各試験体を２４時間放置後、試験体より高さ３９５ｍｍから２５０Ｗの赤外線ランプを照射し、塗膜（比較品は密粒度アスファルトコンクリートブロック）の表面に熱電対を貼り、データロガーを用いて表面温度を測定し温度上昇を計測した。
<Heat insulation test>
Each test specimen is allowed to stand for 24 hours, and then an infrared lamp with a height of 395 mm to 250 W is irradiated from the specimen, a thermocouple is attached to the surface of the coating film (comparative product is a fine-grained asphalt concrete block), and a data logger is used. The temperature rise was measured by measuring the surface temperature.
上記密粒度アスファルトコンクリートブロックの未塗布のものを対照例として同様の遮熱性試験を行なった。 A similar heat-insulating test was conducted using the uncoated fine-grained asphalt concrete block as a control example.
＜試験結果＞
試験結果を示す表1から、本発明の塗料組成物は、乾燥時間が３分以内と、従来の合成樹脂系塗料に比して、格段に短いことが分かる。
<Test results>
From Table 1 showing the test results, it can be seen that the coating composition of the present invention has a drying time within 3 minutes, which is much shorter than conventional synthetic resin coatings.
また、遮熱性も対照例である密粒度アスファルトコンクリートブロックに比して、表面温度を１１℃乃至１８℃も低下することが確認できた。 Further, it was confirmed that the surface temperature was lowered by 11 ° C. to 18 ° C. as compared with the dense grained asphalt concrete block which is also a heat shielding property.
さらに、塗膜の遮熱性（日射反射率）は、赤外線反射顔料が混合系の場合、混合系構成顔料の最低値に依存することも確認できた。 Furthermore, when the infrared reflective pigment was a mixed system, it was also confirmed that the heat shielding property (solar reflectance) of the coating film depended on the minimum value of the mixed system constituent pigment.
Claims (5)
前記熱可塑性結合材の色相（ガードナー法）８以下であり、
該配合組成が、熱可塑性結合材：１０〜２５質量％、硬質骨材：１０〜２０質量％、体質材：３０〜６５質量％、可塑剤：0.５〜５質量％、赤外線反射顔料：0.25〜５質量％であるとともに、
前記赤外線反射顔料の構成顔料の日射反射率の最低値が１５％以上である、
ことを特徴とする遮熱性塗料組成物。 A heat-melting type heat-insulating coating composition comprising a thermoplastic binder as a matrix and white or transparent hard aggregate (excluding glass beads), an extender, a plasticizer and an infrared reflecting pigment as essential components. ,
The hue of the thermoplastic binder (Gardner method) is 8 or less,
The blend composition is thermoplastic binder : 10-25% by mass, hard aggregate: 10-20% by mass, extender: 30-65% by mass, plasticizer: 0.5-5% by mass, infrared reflective pigment: 0.25-5% by mass,
The minimum value of the solar reflectance of the constituent pigment of the infrared reflective pigment is 15% or more,
The heat-shielding coating composition characterized by the above-mentioned.
前記熱可塑性結合材の色相（ガードナー法）８以下であり、
該配合組成が、熱可塑性結合材：１０〜２５質量％、硬質骨材：１０〜２０質量％、体質材：３０〜６５質量％、可塑剤：0.５〜５質量％、赤外線反射顔料：0.25〜５質量％であるとともに、
前記体質材の一部が無機中空微粒子に置換され、該無機中空微粒子の配合組成が、配合組成全量中５〜２５質量%であり、さらに、
前記赤外線反射顔料の構成顔料の日射反射率の最低値が１５％以上である、
ことを特徴とする遮熱性塗料組成物。 A hot-melt type thermal barrier coating composition comprising a thermoplastic binder as a matrix, and white or transparent hard aggregate, extender, plasticizer and infrared reflective pigment as essential components,
The hue of the thermoplastic binder (Gardner method) is 8 or less,
The blend composition is thermoplastic binder : 10-25% by mass, hard aggregate: 10-20% by mass, extender: 30-65% by mass, plasticizer: 0.5-5% by mass, infrared reflective pigment: 0.25-5% by mass,
A part of the extender is replaced with inorganic hollow fine particles, and the composition of the inorganic hollow fine particles is 5 to 25% by mass in the total amount of the composition,
The minimum value of the solar reflectance of the constituent pigment of the infrared reflective pigment is 15% or more,
The heat-shielding coating composition characterized by the above-mentioned.
前記遮熱性塗料組成物を溶融塗布して0.５〜３ｍｍの遮熱性塗膜を形成することを特徴とする遮熱性塗膜の施工方法。 A thermal barrier coating is applied on a concrete paving surface such as dense asphalt paving (including semi-flexible paving) and mortar concrete paving using the thermal barrier coating composition according to claim 1, 2, or 3. A way to
A method for applying a heat-shielding coating film, comprising melt-coating the heat-shielding coating composition to form a heat-shielding coating film of 0.5 to 3 mm.
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|---|---|---|---|---|
| JPS52146442A (en) * | 1976-05-31 | 1977-12-06 | Mitsui Petrochem Ind Ltd | Hot-melt traffic paint composition |
| JPS60130660A (en) * | 1983-12-19 | 1985-07-12 | Hitachi Chem Co Ltd | Melt type, non-skid marking material |
| JP3407070B2 (en) * | 1999-05-31 | 2003-05-19 | 株式会社キクテック | Road marking paint composition |
| JP4118090B2 (en) * | 2002-06-12 | 2008-07-16 | 株式会社Ｎｉｐｐｏコーポレーション | Surface treatment method for pavement |
| JP4818822B2 (en) * | 2006-06-09 | 2011-11-16 | 株式会社キクテック | Road marking paint composition |
-
2010
- 2010-03-10 JP JP2010053632A patent/JP5204142B2/en active Active
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| Publication number | Publication date |
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