JP5750318B2 - Water-based paint and repair method using the same - Google Patents
Water-based paint and repair method using the same Download PDFInfo
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- JP5750318B2 JP5750318B2 JP2011143751A JP2011143751A JP5750318B2 JP 5750318 B2 JP5750318 B2 JP 5750318B2 JP 2011143751 A JP2011143751 A JP 2011143751A JP 2011143751 A JP2011143751 A JP 2011143751A JP 5750318 B2 JP5750318 B2 JP 5750318B2
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- 239000003973 paint Substances 0.000 title claims description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 37
- 238000000034 method Methods 0.000 title claims description 13
- 230000008439 repair process Effects 0.000 title claims description 8
- 239000011248 coating agent Substances 0.000 claims description 39
- 238000000576 coating method Methods 0.000 claims description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 33
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 15
- 239000000377 silicon dioxide Substances 0.000 claims description 15
- 239000012855 volatile organic compound Substances 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 11
- 239000002562 thickening agent Substances 0.000 claims description 8
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 3
- 239000011701 zinc Substances 0.000 description 12
- 229910052725 zinc Inorganic materials 0.000 description 12
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 235000019645 odor Nutrition 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 4
- 239000002518 antifoaming agent Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000008199 coating composition Substances 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000002612 dispersion medium Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000007761 roller coating Methods 0.000 description 3
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 229910003902 SiCl 4 Inorganic materials 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- -1 for example Inorganic materials 0.000 description 2
- 229910021485 fumed silica Inorganic materials 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000005049 silicon tetrachloride Substances 0.000 description 2
- 239000001039 zinc pigment Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003006 anti-agglomeration agent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Description
本発明は、揮発性有機化合物（ＶＯＣ）成分が極小であって、環境を悪化させない水性塗料、及びこれを使用する鋼材の補修方法に関するものである。 The present invention relates to a water-based paint having a minimum volatile organic compound (VOC) component and not deteriorating the environment, and a method for repairing a steel material using the same.
鋼材の表面処理としては、鋼材の表面に亜鉛の合金層を形成する亜鉛めっき法が知られている。亜鉛めっきを施した鋼材の表面には、亜鉛と酸素が反応した酸化皮膜が形成され、鋼材そのものの腐食が効果的に抑制される。そして、数十年にわたって防食効果が期待できるとも言われている。 As a surface treatment of a steel material, a galvanizing method is known in which a zinc alloy layer is formed on the surface of the steel material. On the surface of the galvanized steel material, an oxide film in which zinc and oxygen react is formed, and corrosion of the steel material itself is effectively suppressed. And it is said that the anticorrosive effect can be expected for several decades.
しかし、海浜地区などの腐食環境下では、それほど長期の防食効果が望めず、比較的早い段階で鋼材表面に錆が浮いてくることがあり、これを放置すると鋼材の劣化が著しく進行する。そこで、錆が浮いてきた鋼材の補修作業が必要となり、鋼材表面の錆を削り落とすケレン作業の後に、ジンクリッチ塗料を塗布することが知られている。 However, in a corrosive environment such as a beach area, a long-term anticorrosive effect cannot be expected, and rust may float on the surface of the steel material at a relatively early stage. If this is left untreated, the steel material will deteriorate significantly. Therefore, it is necessary to repair the steel material on which rust has floated, and it is known that a zinc rich paint is applied after the keren operation for scraping off the rust on the steel material surface.
しかし、ジンクリッチ塗料は、一般に、有機溶剤と亜鉛とが混合されて構成されているので、塗布作業時に発生する揮発性有機化合物とそれによる異臭が作業環境や近隣環境を悪化させるという問題があった。 However, since zinc-rich paints are generally composed of a mixture of an organic solvent and zinc, there is a problem that the volatile organic compounds generated during the coating operation and the odors caused thereby deteriorate the working environment and the surrounding environment. It was.
そこで、有機溶剤を抑制して水を主たる分散媒にする水系ジンクリッチ塗料も提案されているが（特許文献１〜特許文献２）、常温下で使用でき、はけ塗りやローラー塗りに適した塗料組成を教示するものではない。また、鋼材ケレン面の補修塗装直後の塗膜に不可避的に浮遊してくるフラッシュラストを効果的に低減できる塗料組成や、発生したフラッシュラストの成長を抑止する適切な補修方法は未だ知られていない。
Therefore, water-based zinc-rich paints that suppress organic solvents and use water as the main dispersion medium have also been proposed (
本発明は、上記の問題点に鑑みてなされたものであって、フラッシュラストを効果的に低減できる水性塗料、及び、このような水性塗料を使用した適切な補修方法を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a water-based paint capable of effectively reducing flash last and an appropriate repair method using such a water-based paint. To do.
上記の目的を達成するため、発明者は、種々の実験を繰り返した結果、特定の組成の水性塗料によれば、錆が生じている鋼材であっても作業環境を悪化させることなく補修できることを見出して本発明を完成させた。 In order to achieve the above object, as a result of repeating various experiments, the inventors have found that a water-based paint having a specific composition can be repaired without deteriorating the working environment even if the steel material is rusted. As a result, the present invention was completed.
すなわち、本発明は、鋼材表面に上塗りされる水性塗料であって、微粉末シリカ、微粉末シリカ以外の増粘剤、及び水性ウレタン樹脂を含有すると共に、塗料全体に対して７０％〜９０％で、且つ、固体成分に対して９０％〜９７％の重量比の亜鉛末を含有し、前記微粉末シリカが、前記亜鉛末に対して１０００〜５０００ｐｐｍの重量比で添加されており、塗料全体の重量比１０％〜２５％が揮発成分で構成され、揮発性有機化合物は、塗料全体の重量比１％未満である。本発明の揮発成分とは、乾燥状態で塗膜に残存しない物質を意味し、分散媒たる水を含んだ概念である。また、本発明の数値範囲は、以上と以下で規定されており、数値両端を含んでいる。 That is, the present invention is a water-based paint that is overcoated on the surface of a steel material, and contains fine powder silica, a thickening agent other than fine powder silica , and a water-based urethane resin, and 70% to 90% of the whole paint. And zinc powder in a weight ratio of 90% to 97% with respect to the solid component, and the fine powder silica is added in a weight ratio of 1000 to 5000 ppm with respect to the zinc powder , The weight ratio of 10% to 25% is composed of volatile components, and the volatile organic compound is less than 1% by weight of the entire paint . The volatile component of the present invention means a substance that does not remain in the coating film in a dry state, and is a concept including water as a dispersion medium. The numerical range of the present invention is defined as above and below, and includes both numerical ends.
本発明の水性塗料は、分散媒として水を使用するものの、塗料全体に対して７０％〜９０％で、且つ、固体成分に対して９０％〜９７％の重量比の亜鉛末を含有し、乾燥時間が短いので、金属面が露出した鋼材に塗布しても鋼材表面がウェットな時間を低減することができ、フラッシュラストの発生を効果的に抑制することができる。さらには、亜鉛顔料の犠牲防食作用により、フラッシュラストの広がりを電気化学的に抑制することができる。 Although the water-based paint of the present invention uses water as a dispersion medium, it contains zinc powder in a weight ratio of 70% to 90% with respect to the whole paint and 90% to 97% with respect to the solid component, Since the drying time is short, the time when the steel surface is wet can be reduced even when applied to the steel material with the exposed metal surface, and the occurrence of flash last can be effectively suppressed. Furthermore, the spread of flash last can be electrochemically suppressed by the sacrificial anticorrosive action of the zinc pigment.
また、本発明の水性塗料は、揮発性有機化合物の含有量が、塗料全体の重量比１％未満に抑制されているので、溶剤の乾燥時における作業環境や近隣環境への悪影響が極めて少ない。なお、本発明の水性塗料は、旧塗装膜の上に重複して塗装できるが、鋼材表面に錆が発生しているような場合には、旧塗装膜を剥離するケレン作業を先行させるのが好適である。 Moreover, since the content of the volatile organic compound is suppressed to less than 1% by weight of the entire paint, the water-based paint of the present invention has very little adverse effect on the working environment and the neighboring environment when the solvent is dried. In addition, the water-based paint of the present invention can be applied over the old paint film, but in the case where rust is generated on the steel surface, it is preferable to precede the work of peeling off the old paint film. Is preferred.
また、本発明の水性塗料は、鋼材の表面に直接塗布することもでき、この場合には、亜鉛めっきを省略することができる。すなわち、本発明の水性塗料は、常温下で使用できるので、高温状態（４６０℃以上）の亜鉛槽での亜鉛めっき工程を省略することで、薄板材の熱変形などを回避することができる。 In addition, the water-based paint of the present invention can be directly applied to the surface of a steel material, and in this case, galvanization can be omitted. That is, since the water-based paint of the present invention can be used at room temperature, it is possible to avoid thermal deformation of the thin plate material by omitting the galvanizing step in the zinc bath in a high temperature state (460 ° C. or higher).
本発明では、亜鉛含有量は、塗料全体に対して重量比７０％〜９０％であるが、より好ましくは、重量比７５％〜８７％とすべきである。また、亜鉛含有量は、固体成分に対して、より好ましくは、重量比９２．１％〜９７％とすべきである。 In the present invention, the zinc content is 70% to 90% by weight with respect to the whole paint, but more preferably 75% to 87% by weight. The zinc content should more preferably be 92.1% to 97% by weight relative to the solid component.
本発明の揮発成分は、塗料全体の重量比１０％〜２５％であるが、より好ましくは、２０重量％以下に抑制されるべきである。このような場合、典型的には、重量比７５％以上の亜鉛末の第１材料と、重量比２５％未満の第２材料とを別々に用意し、作業現場で両者を混合して、本発明の水性塗料を完成させるのが好適である。 The volatile component of the present invention is 10% to 25% by weight of the entire coating material, and more preferably should be suppressed to 20% by weight or less. In such a case, typically, a first material of zinc powder with a weight ratio of 75% or more and a second material with a weight ratio of less than 25% are prepared separately, and both are mixed at the work site, It is preferred to complete the aqueous paint of the invention.
このような組成によれば、はけ塗りやローラー塗りに適した粘度が実現されるが、エアスプレーガン塗装、エアレススプレーガン塗装を実現するためには、必要に応じて希釈水を追加して使用してもよい。但し、希釈水は、塗料全体の２重量％以下に制限すべきである。 According to such a composition, a viscosity suitable for brush coating or roller coating is realized, but in order to realize air spray gun coating and airless spray gun coating, dilution water is added as necessary. May be used. However, the dilution water should be limited to 2% by weight or less of the entire paint.
また、本発明の水性ウレタン樹脂（固形分）は、好ましくは、塗料全体に対して重量比３％〜９％の含有比とすべきである。また、好ましい実施形態によれば、乾燥膜厚４０μｍにおいて、ＪＩＳ Ｋ５６００−５−４に基づく表面硬度がＢ〜２Ｈとなる。表面硬度は、より好ましくは、ＨＢ〜２Ｈとすべきであり、実施例の水性塗料では表面硬度がＨＢ以上となる。 Moreover, the aqueous urethane resin (solid content) of the present invention should preferably have a content ratio of 3% to 9% by weight with respect to the entire coating material. According to a preferred embodiment, the surface hardness based on JIS K5600-5-4 is B to 2H at a dry film thickness of 40 μm. More preferably, the surface hardness should be HB to 2H. In the water-based paint of the example, the surface hardness is HB or more.
本発明の水性塗料は、好適には、増粘剤、消泡剤、分散剤の何れか一以上が含有されて、はけ塗りやローラー塗りに適した粘度に調製される。増粘剤の配合量は、必要な粘度に対応して適宜に設定されるが、塗料全体に対して、重量濃度１５００〜２２００ｐｐｍ程度であるのが好適である。 The water-based paint of the present invention preferably contains one or more of a thickener, an antifoaming agent, and a dispersant, and is prepared to have a viscosity suitable for brushing or roller coating. The blending amount of the thickener is appropriately set according to the required viscosity, but it is preferable that the weight concentration is about 1500 to 2200 ppm with respect to the entire coating material.
そして、増粘剤としては、ポリエーテルポリオール及びノニオン活性剤を、増粘剤全体に対して３０〜４５重量％程度含有するものが好適に選択される。なお、ポリエーテルポリオールは、ノニオン活性剤に対して重量比４．０〜５．０程度が含有されるのが好適である。 And as a thickener, what contains a polyether polyol and a nonionic activator about 30 to 45 weight% with respect to the whole thickener is selected suitably. In addition, it is suitable that polyether polyol contains about 4.0-5.0 weight ratio with respect to a nonionic activator.
消泡剤と分散剤は、好ましくは、互いに、０．７：１〜１：０．７程度、より好ましくは０．９：１〜１：０．９程度の重量比で重複して添加するのが好適である。 The antifoaming agent and the dispersing agent are preferably added to each other in a weight ratio of about 0.7: 1 to 1: 0.7, more preferably about 0.9: 1 to 1: 0.9. Is preferred.
本発明の水性塗料には、塗布性などの観点から、好ましくは、平均粒径が４〜５μｍ程度の亜鉛末が使用される。更に好ましくは、亜鉛末は、亜鉛及び酸化亜鉛で構成され、これに、１０００〜５０００ｐｐｍの微粉末シリカが含有される。含有された微粉末シリカは、凝集防止剤として機能し、かつ、亜鉛末混練時の分散性を向上させている。また、上記の量を添加することで、増粘効果を発揮し、亜鉛顔料の沈降を抑制、さらには消泡剤との相乗効果で、塗膜形成過程におけるスムーズな消泡を可能としている。微粉末シリカＳｉＯ２としては、例えば、４塩化ケイ素（ＳｉＣｌ４）を水素（Ｈ２）火炎中で燃焼させて生成されるヒュームドシリカが好適に使用される。 For the water-based paint of the present invention, zinc powder having an average particle size of about 4 to 5 μm is preferably used from the viewpoint of applicability and the like. More preferably, the zinc dust is composed of zinc and zinc oxide, and contains 1000 to 5000 ppm of finely divided silica. The contained fine powder silica functions as an anti-agglomeration agent and improves the dispersibility when kneading zinc powder. Further, by adding the above amount, a thickening effect is exhibited, the precipitation of the zinc pigment is suppressed, and further, a synergistic effect with the antifoaming agent enables smooth defoaming in the coating film forming process. As the fine powder silica SiO 2 , for example, fumed silica produced by burning silicon tetrachloride (SiCl 4 ) in a hydrogen (H 2 ) flame is suitably used.
また、本発明は、鋼材表面に、水性塗料を塗布して乾燥状態で膜厚３０〜５０μｍの第１塗膜を形成する第１塗布工程と、第１塗布工程で塗布した水性塗料が乾燥した後、同一の水性塗料を塗布して乾燥状態で膜厚３０〜５０μｍの第２塗膜を形成する第２塗布工程と、を有し、前記水性塗料は、微粉末シリカ、微粉末シリカ以外の増粘剤、及び水性ウレタン樹脂を含有すると共に、塗料全体に対して７０％〜９０％で、且つ、固体成分に対して９０％〜９７％の重量比の亜鉛末を含有し、前記微粉末シリカが、前記亜鉛末に対して１０００〜５０００ｐｐｍの重量比で添加されおり、塗料全体の重量比１０％〜２５％が揮発成分で構成され、揮発性有機化合物は、塗料全体の重量比１％未満である。 The present invention also includes a first coating step in which a water-based paint is applied to a steel material surface to form a first coating film having a thickness of 30 to 50 μm in a dry state, and the water-based paint applied in the first coating step is dried. And a second coating step in which the same aqueous paint is applied to form a second coating film having a film thickness of 30 to 50 μm in a dry state, and the aqueous paint is other than fine powder silica and fine powder silica. The fine powder containing a thickener and an aqueous urethane resin, and containing zinc powder in a weight ratio of 70% to 90% with respect to the entire coating material and 90% to 97% with respect to the solid component, Silica is added in a weight ratio of 1000 to 5000 ppm with respect to the zinc dust, 10% to 25% by weight of the entire paint is composed of volatile components, and the volatile organic compound is 1% by weight of the whole paint. Is less than .
本発明によれば、同一の塗料を重ね塗りすることで足りるので、作業性に優れている。なお、三回以上の重ね塗りすることを禁止するものではないが、膜厚３０〜５０μｍの塗装膜層を二重に設けることで、第１塗布工程の直後にフラッシュラストが発生した場合でも、その成長を確実に抑止することができる。なお、この点は、多数回の実験によって確認している。 According to the present invention, since it is sufficient to apply the same paint repeatedly, the workability is excellent. In addition, although it is not prohibited to overcoat three times or more, even if flash last occurs immediately after the first coating step by providing a coating film layer having a film thickness of 30 to 50 μm, That growth can be reliably deterred. This point has been confirmed by many experiments.
本発明の第１塗布工程は、鋼材表面に塗装膜を残した状態で実行しても良いが、塗装膜に錆が浮いている場合には、塗装膜を剥離するケレン作業を第１塗布工程に先行して実行するのが好ましい。 The first coating step of the present invention may be performed with the coating film left on the steel surface. However, when rust is floating on the coating film, the first coating step is performed to remove the coating film. It is preferable to execute it prior to.
上記した本発明によれば、フラッシュラストを効果的に低減できる水性塗料、及び、このような水性塗料を使用した適切な補修方法を実現できる。 According to the above-described present invention, it is possible to realize a water-based paint capable of effectively reducing flash last and an appropriate repair method using such a water-based paint.
以下、実施例に基づいて本発明を説明するが特に本発明を限定するものではない。図１は、実施例１〜実施例７と比較例１〜比較例５の塗料組成と、重要成分の組成割合を図示したものである。なお、液組成を示す数値は、重量部を意味し、組成割合は、重量％を意味している。消泡剤と分散剤については、固・液の明確な分類が困難であり、かつ塗料中での割合は極微量であるため、計算上、揮発性有機化合物（ＶＯＣ）として扱った。 EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not specifically limited. FIG. 1 illustrates the coating compositions of Examples 1 to 7 and Comparative Examples 1 to 5, and the composition ratios of important components. In addition, the numerical value which shows a liquid composition means a weight part, and a composition ratio means the weight%. Regarding the antifoaming agent and the dispersing agent, it was difficult to clearly classify the solid and the liquid, and the ratio in the paint was extremely small. Therefore, they were treated as volatile organic compounds (VOC) in the calculation.
水性ウレタン樹脂Ａ、水性アクリルエマルション樹脂Ｂ、水性変性エポキシ樹脂Ｃ、水性変性エポキシエステル樹脂Ｄとしては、市場で入手可能な一般的な樹脂を使用し、各々の固形成分は、３８％、３５％、３３％、３７％であった。なお、樹脂Ａ〜Ｄについて、同種の複数の樹脂について実験したが、ほぼ同様の傾向が得られた。溶剤系塗料としては自社製のものを使用した。 As the water-based urethane resin A, the water-based acrylic emulsion resin B, the water-modified epoxy resin C, and the water-modified epoxy ester resin D, common resins available on the market are used, and the respective solid components are 38% and 35%. 33% and 37%. In addition, about resin A-D, although it experimented about several resin of the same kind, the substantially the same tendency was acquired. In-house manufactured solvent was used as the solvent-based paint.
亜鉛末としては、金属亜鉛分９５．０％以上、総亜鉛分９８．０％以上のものを使用し、微粉末シリカとしては、例えば、４塩化ケイ素（ＳｉＣｌ４）を水素（Ｈ２）火炎中で燃焼させて生成されるヒュームドシリカを使用した。なお、添加量は、亜鉛末に対する重量濃度で示している。 As zinc powder, metal zinc content of 95.0% or more and total zinc content of 98.0% or more are used. As fine powder silica, for example, silicon tetrachloride (SiCl 4 ) is a hydrogen (H 2 ) flame. Fumed silica produced by burning in was used. In addition, the addition amount is shown by the weight concentration with respect to zinc powder.
そして、乾燥塗膜中の亜鉛含有量は、実施例１〜実施例７について計算すると、９４．５９％、９２.１６％、９４．８６％、９４．８４％、９４．７７％、９４．４１％、９６．１４％と算出される。また、比較例１〜比較例４は、８５．５７％、９６．１１％、９６．０２％、９６．０７％と算出される。 And when zinc content in a dry coating film calculates about Example 1- Example 7, 94.59%, 92.16%, 94.86%, 94.84%, 94.77%, 94.77%. It is calculated as 41% and 96.14%. Further, Comparative Examples 1 to 4 are calculated as 85.57%, 96.11%, 96.02%, and 96.07%.
図２は、図１に示す水性塗料の性能試験の結果を示している。 FIG. 2 shows the results of the performance test of the water-based paint shown in FIG.
ここで、「樹脂単膜物性」は、樹脂単体での鉄面への成膜性、鉄面への付着性（碁盤目試験）、鉛筆硬度、耐溶剤性（ラビングテスト）、耐候性（屋外暴露 目視外観）を検証して、この５試験の評価結果を総合して、樹脂単膜物性評価とした。 Here, “resin single film physical properties” refers to film formation on the iron surface with a single resin, adhesion to the iron surface (cross-cut test), pencil hardness, solvent resistance (rubbing test), weather resistance (outdoors) Exposure visual appearance) was verified, and the evaluation results of these five tests were combined to evaluate the physical properties of the resin single film.
○は良好、△はやや懸念あり、×は樹脂単膜としては問題あり、との評価である。 ○ is good, Δ is somewhat concerned, and × is a problem as a single resin film.
「混練作業性」については、亜鉛末と塗料液を混練した際の、分散作業性、凝集物の有無などを評価した。○は良好、△はやや混練しにくいが容易に分散できる、×は混練、分散が非常に困難を意味する。なお、△−は、△と×の間の評価である。 Regarding “kneading workability”, dispersion workability, presence / absence of aggregates, and the like when kneading zinc powder and coating liquid were evaluated. ○ means good, Δ is slightly difficult to knead but can be easily dispersed, × means very difficult to knead and disperse. Δ− is an evaluation between Δ and ×.
「塗布性（はけ、ローラー）」は、混練後の塗料をはけ及びローラーにて鋼板へ塗装し、塗装しやすさ、成膜性を評価した。○は良好、△は、塗布しにくいが均一膜の形成が可能、×は塗布が非常に困難で、不均一な膜との評価である。 “Applicability (bake, roller)” was evaluated by applying the kneaded paint to a steel plate with a brush and a roller, and evaluating ease of coating and film formability. ○ is good, Δ is difficult to apply, but a uniform film can be formed, and x is very difficult to apply, and it is evaluated as a non-uniform film.
「塗膜外観」としては、塗布性評価後、乾燥した膜を目視評価した。○は良好、△は、ピンホール、斑が少しあるが、全体として許容できる外観を意味し、×はピンホール、斑などの異常が顕著で、外観不良を意味する。 As the “appearance of the coating film”, the dried film was visually evaluated after the applicability evaluation. “Good” means “good”, “Δ” means pinholes and spots, but an acceptable appearance as a whole, and “x” means remarkable abnormalities such as pinholes and spots and poor appearance.
「耐液沈澱性」は、混練後の塗料を３時間静置した後、缶底の状況を確認した。○は沈澱物なし、△はやや固い沈澱があるが、容易に分散できる、×は顕著に固い沈澱物が発生し、分散が非常に困難との評価である。 “Liquid precipitation resistance” was confirmed by allowing the kneaded paint to stand for 3 hours and then checking the condition of the bottom of the can. ○ indicates that there is no precipitate, Δ indicates that the precipitate is slightly hard but can be easily dispersed, and × indicates that a significantly hard precipitate is generated and dispersion is very difficult.
「付着性（碁盤目試験）」は、クロスカット法（ＪＩＳ Ｋ ５６００−５−６：１９９９）にて評価（１ｍｍを適用）した。○は分類０〜１、△は分類２〜３、×は分類４〜５を意味する。
“Adhesiveness (cross cut test)” was evaluated by applying a cross-cut method (JIS K 5600-5-6: 1999) (applying 1 mm). ○ means
「耐腐食性（塩水噴霧試験）」は、耐中性塩水噴霧性（ＪＩＳ Ｋ ５６００−７−１：１９９９）にて評価した。具体的には、鋼板に形成した塗膜にカッターナイフで素地に達するクロスカットを入れ、試験開始からどれだけの時間でクロスカット部からの発錆が見られるかを目視評価した。また、クロスカット部以外の塗膜の変化についても観察した。○は１０００時間以上発錆なし、塗膜異常なしを意味する。△は５００〜１０００時間で発錆、顕著な塗膜異常なしを意味する。×は、０〜５００時間で発錆、あるいは顕著な塗膜異常（ブリスタ等）が発生したことを意味する。 “Corrosion resistance (salt spray test)” was evaluated by neutral salt spray resistance (JIS K 5600-7-1: 1999). Specifically, a crosscut reaching the substrate with a cutter knife was put into the coating film formed on the steel plate, and visually evaluated how long rusting from the crosscut portion was observed from the start of the test. Moreover, it observed also about the change of the coating film other than a crosscut part. ○ means no rusting for 1000 hours or more and no coating film abnormality. Δ means rusting in 500 to 1000 hours and no noticeable coating abnormality. X means that rusting or remarkable coating film abnormality (blister etc.) occurred in 0 to 500 hours.
「作業環境性（臭気）」としては、混練後の塗料の臭いを確認（溶剤臭の有無、不快感を定性評価）した。○は不快臭なし、問題ないことを意味し、△はやや不快臭を感じるとの意味である。×は、不快臭、または溶剤臭が問題となりうるとの評価である。 As “working environment (odor)”, the odor of the paint after kneading was confirmed (presence or absence of solvent odor, discomfort was evaluated qualitatively). ○ means that there is no unpleasant odor and no problem, and △ means that a slightly unpleasant odor is felt. X is evaluation that an unpleasant odor or a solvent odor may become a problem.
「耐熱性（１７０℃２４時間）」としては、鋼板に形成した塗膜を、１７０℃の環境（恒温器内）に２４時間曝し、取り出し静置後、鋼板が室温となった状態で、付着性評価を行った。 “Heat resistance (170 ° C., 24 hours)” means that the coating film formed on the steel sheet is exposed to an environment of 170 ° C. (in a thermostatic chamber) for 24 hours, taken out and left in a state where the steel sheet is at room temperature. Sex evaluation was performed.
図２に示す通り、水性ウレタン樹脂を含有すると共に、塗料全体に対して７０％〜９０％で、且つ、固体成分に対して９０％〜９７％の重量比の亜鉛末を含有し、塗料全体の重量比１０％〜２５％が揮発成分で構成され、揮発性有機化合物は、塗料全体の重量比１％未満であることによって優れた効果を発揮することが確認された。 As shown in FIG. 2, it contains a water-based urethane resin, and contains zinc powder at a weight ratio of 70% to 90% with respect to the whole paint and 90% to 97% with respect to the solid component, and the whole paint It was confirmed that 10% to 25% by weight of the volatile organic compound is composed of volatile components, and that the volatile organic compound exhibits an excellent effect when it is less than 1% by weight.
Claims (5)
微粉末シリカ、微粉末シリカ以外の増粘剤、及び水性ウレタン樹脂を含有すると共に、塗料全体に対して７０％〜９０％で、且つ、固体成分に対して９０％〜９７％の重量比の亜鉛末を含有し、
前記微粉末シリカが、前記亜鉛末に対して１０００〜５０００ｐｐｍの重量比で添加されており、
塗料全体の重量比１０％〜２５％が揮発成分で構成され、揮発性有機化合物は、塗料全体の重量比１％未満であることを特徴とする水性塗料。 It is a water-based paint that is overcoated on the steel surface,
It contains fine powder silica, thickeners other than fine powder silica , and aqueous urethane resin, and has a weight ratio of 70% to 90% with respect to the entire coating material and 90% to 97% with respect to the solid component. Contains zinc dust,
The fine powder silica is added at a weight ratio of 1000 to 5000 ppm with respect to the zinc powder ,
A water-based paint characterized in that 10% to 25% by weight of the whole paint is composed of volatile components, and the volatile organic compound is less than 1% by weight of the whole paint.
第１塗布工程で塗布した水性塗料が乾燥した後、同一の水性塗料を塗布して乾燥状態で膜厚３０〜５０μｍの第２塗膜を形成する第２塗布工程と、を有し、
前記水性塗料は、微粉末シリカ、微粉末シリカ以外の増粘剤、及び水性ウレタン樹脂を含有すると共に、塗料全体に対して７０％〜９０％で、且つ、固体成分に対して９０％〜９７％の重量比の亜鉛末を含有し、
前記微粉末シリカが、前記亜鉛末に対して１０００〜５０００ｐｐｍの重量比で添加されおり、
塗料全体の重量比１０％〜２５％が揮発成分で構成され、揮発性有機化合物は、塗料全体の重量比１％未満であることを特徴とする鋼材の補修方法。 A first coating step of applying a water-based paint on a steel surface to form a first coating film having a thickness of 30 to 50 μm in a dry state;
After the water-based paint applied in the first application process is dried, the second application process of applying the same water-based paint to form a second coating film having a film thickness of 30 to 50 μm in a dry state,
The water-based paint contains fine powder silica, a thickener other than fine powder silica , and a water-based urethane resin, and is 70% to 90% of the whole paint and 90% to 97 of the solid component. % By weight zinc powder,
The fine powder silica is added in a weight ratio of 1000 to 5000 ppm with respect to the zinc powder ,
A method of repairing a steel material, characterized in that a weight ratio of 10% to 25% of the whole paint is composed of volatile components, and the volatile organic compound is less than 1% by weight of the whole paint .
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