JP2010188325A - Coating method and rust-proofing coating film - Google Patents
Coating method and rust-proofing coating film Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 107
- 239000011248 coating agent Substances 0.000 title claims abstract description 86
- 239000003822 epoxy resin Substances 0.000 claims abstract description 17
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 13
- 239000011347 resin Substances 0.000 claims abstract description 13
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims abstract description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 8
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 8
- 239000011701 zinc Substances 0.000 claims abstract description 8
- 239000003973 paint Substances 0.000 claims description 58
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- 238000010422 painting Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 24
- 229910000831 Steel Inorganic materials 0.000 abstract description 12
- 239000010959 steel Substances 0.000 abstract description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000460 chlorine Substances 0.000 abstract description 6
- 229910052801 chlorine Inorganic materials 0.000 abstract description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 4
- VTAFVPRBZJEEDR-UHFFFAOYSA-N acetylsilicon Chemical compound CC([Si])=O VTAFVPRBZJEEDR-UHFFFAOYSA-N 0.000 abstract 1
- 230000005764 inhibitory process Effects 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 14
- 230000002265 prevention Effects 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- -1 chlorine ions Chemical class 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 description 2
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 2
- 238000004453 electron probe microanalysis Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000010220 ion permeability Effects 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
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- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
本発明は、防食塗膜を形成する塗装方法に関するものである。更に詳しくは、塩害暴露環境においても長期間防食効果を持続でき、従来の塗膜より塗り替え間隔が延長できる防食塗膜を形成する塗装方法に関するものである。 The present invention relates to a coating method for forming an anticorrosion coating film. More particularly, the present invention relates to a coating method for forming an anticorrosion coating film that can maintain the anticorrosion effect for a long time even in an environment exposed to salt damage and can extend the repainting interval as compared with a conventional coating film.
従来鉄鋼構造物の塗装には、素地調整や塗装方法の制約から、悪素地面に適性のある油性さび止め塗料や変性エポキシ樹脂塗料を下塗りとし、各種上塗り塗料を組み合わせる塗装方法が採用されている。例えば、エポキシ樹脂系塗料を下塗りし、次いでアクリルシリコン樹脂系塗料を上塗りとする塗装方法（特許文献１）や、防錆顔料を含有する水系の下塗材組成物により下塗り塗膜を形成させ、上塗りにアルキルメタルアクリレートの共重合体を含有する塗料を塗布する方法（特許文献２）、さらには、エポキシ樹脂を下塗りし、次いでアミノアルキド塗料またはアミノアクリル塗料を上塗りとする方法（特許文献３）などが提案されている。 Conventionally, coating methods that combine various top coats with an oil-based rust-preventive paint or modified epoxy resin paint suitable for rough ground have been used to coat steel structures due to restrictions on the base preparation and painting methods. . For example, an undercoating film is formed by using a coating method (Patent Document 1) in which an epoxy resin-based paint is primed and then an acrylic silicon resin-based paint is overcoated, or an aqueous primer composition containing an anticorrosive pigment. A method of applying a coating containing an alkyl metal acrylate copolymer (Patent Document 2), a method of applying an epoxy resin undercoating, and then applying an aminoalkyd coating or an aminoacrylic coating as a top coating (Patent Document 3), etc. Has been proposed.
しかし、何れの塗装も塩水が存在して、塩害の厳しい環境において塗膜の耐久性、特に防錆性に問題があるため、更なる防食性及び耐久性を備えた塗装ないし係る塗装を形成する塗装方法が望まれている。 However, since all the coatings have salt water and there is a problem with the durability of the coating film, particularly the rust prevention property in an environment where salt damage is severe, a coating with further anticorrosion and durability or a coating with such durability is formed. A painting method is desired.
このような状況下、本発明の目的は、塩害暴露環境における橋梁、タンク、プラント、湾岸設備等の鉄鋼構造物鋼構造物等への塗装において、塗膜の密着性が高く、優れた防錆性を有する塗膜を形成する塗装方法を提供することであり、特には、塩素イオンの透過抑制効果の高い塗膜の塗装方法を提供することである。 Under such circumstances, the object of the present invention is to provide excellent adhesion to coatings and excellent rust prevention in coatings on steel structures such as bridges, tanks, plants, and bay facilities in environments exposed to salt damage. It is providing the coating method which forms the coating film which has property, and is providing the coating method of the coating film with the high permeation | transmission suppression effect of a chlorine ion especially.
本発明者等は、鋭意研究を重ねた結果、第１の塗料として特定のエポキシウレタン樹脂系塗料を塗布し、第２の塗料として特定のアクリルシリコン樹脂系塗料を塗布することにより、前記課題を解決できることを見出し、本発明に想到した。 As a result of extensive research, the present inventors applied the specific epoxy urethane resin-based paint as the first paint, and applied the specific acrylic silicon resin-based paint as the second paint. The inventors have found that this can be solved, and have come up with the present invention.
すなわち、本発明は、
（１）第１の塗料として、アルミニウム及び／又は亜鉛を含有するエポキシ樹脂塗料を塗布し、次いで、第２の塗料として、チタン酸カリウムを含有するアクリルシリコン樹脂塗料を塗布して防食塗膜を形成する塗装方法である。
（２）前記第１の塗料の乾燥膜厚が３０μｍ以上であり、前記第２の塗料の乾燥膜厚が前記第１の塗料の膜厚の１倍以上である塗装方法である。
（３）前記塗装方法により、被塗装物上に形成された防食塗膜である。
That is, the present invention
(1) An epoxy resin paint containing aluminum and / or zinc is applied as a first paint, and then an acrylic silicon resin paint containing potassium titanate is applied as a second paint to form an anticorrosive coating film. It is the coating method to form.
(2) A coating method in which the dry film thickness of the first paint is 30 μm or more, and the dry film thickness of the second paint is one or more times the film thickness of the first paint.
(3) An anticorrosion coating film formed on an object to be coated by the coating method.
本発明の塗装方法によれば、塩害暴露環境においても塩素イオンの透過を抑制することができるとともに、母材金属に対して優れた付着性を有するため、長期間に渡って防食効果を保持することが可能であり、従来の塗膜よりも塗り替え間隔が延長できる等の格別の効果を奏する。 According to the coating method of the present invention, the permeation of chlorine ions can be suppressed even in an environment exposed to salt damage, and since it has excellent adhesion to the base metal, the anticorrosion effect is maintained over a long period of time. It is possible to achieve a special effect such that the repainting interval can be extended as compared with the conventional coating film.
本発明の塗装方法では、まず第１の塗料として、アルミニウム及び／又は亜鉛を含有するエポキシ樹脂塗料を塗布する。該エポキシ樹脂塗料に用いられるエポキシ樹脂としては、金属との密着性、塗装作業性が良好であることが要求される。このような要求を満足するエポキシ樹脂としては、ビスフェノールＡ型エポヰシ樹脂が密着性の点から最も優れているものの一つである。またノポラック型エポキシ樹脂なども用いることができ、炎天下に曝されるような耐熱性を要する用途に有効である。 In the coating method of the present invention, first, an epoxy resin paint containing aluminum and / or zinc is applied as the first paint. The epoxy resin used for the epoxy resin coating is required to have good adhesion to metal and good coating workability. As an epoxy resin that satisfies such requirements, bisphenol A type epoxy resin is one of the most excellent in terms of adhesion. A nopolac type epoxy resin can also be used, which is effective for applications requiring heat resistance such as being exposed to the sun.
エポキシ樹脂に添加されるアルミニウム及び／又は亜鉛は、腐食原因となる水や酸素が透過した場合に鋼材より先に反応して鋼材との反応を防止する、いわゆる犠牲防食作用を有している。アルミニウム及び／又は亜鉛の金属粒子の平均粒径は、分散性の観点から２〜２５μｍが好ましく、より好ましくは、５〜１５μｍである。これら金属粒子の配合量は、樹脂（及びその硬化剤）１００質量部に対して、アルミニウム粒子の場合５〜２００質量部が適当であり、亜鉛粒子の場合は、例えば、１００〜６００質量部が適当である。この範囲の添加量であれば、充分な防錆性と、良好な常温貯蔵安定性、皮張り性及び耐久性を有する塗膜が得られる。 Aluminum and / or zinc added to the epoxy resin has a so-called sacrificial anticorrosive action in which when water or oxygen causing corrosion is permeated, it reacts before the steel material to prevent reaction with the steel material. The average particle diameter of the aluminum and / or zinc metal particles is preferably 2 to 25 μm, more preferably 5 to 15 μm from the viewpoint of dispersibility. The compounding amount of these metal particles is suitably 5 to 200 parts by mass in the case of aluminum particles with respect to 100 parts by mass of the resin (and its curing agent), and in the case of zinc particles, for example, 100 to 600 parts by mass. Is appropriate. If the addition amount is within this range, a coating film having sufficient rust prevention properties, good room temperature storage stability, skin-strength and durability can be obtained.
第１の塗料の塗膜の膜厚は３０μｍ以上が好ましく、より好ましくは３５〜８０μｍである。３０μｍ未満であると塗装面との接着が不十分となったり、防錆性が不充分となったりするため好ましくない。また、過度に膜厚を厚くしようとすると、防食塗料を垂直面に塗装した場合、塗料が垂れやすく、また、乾燥に時間がかかる等の不具合が生じるので好ましくない。 The film thickness of the first coating film is preferably 30 μm or more, more preferably 35 to 80 μm. If it is less than 30 μm, the adhesion to the painted surface becomes insufficient or the rust prevention property becomes insufficient, which is not preferable. On the other hand, if the film thickness is excessively increased, when the anticorrosion paint is applied on the vertical surface, the paint is liable to sag and takes time to dry, which is not preferable.
本発明は第１の塗料の塗布後、チタン酸カリウムを含有するアクリルシリコン樹脂塗料を第２の塗料として塗布する。
本発明において使用するアクリルシリコン樹脂としては、ジメチルポリシロキサン系、フェニルメチルポリシロキサン系、メチルハイドロジェンポリシロキサン系等のシリコン樹脂を挙げることができる。中でも柔軟性付与効果及び耐熱性等の性能及び価格の点からジメチルポリシロキサン系を使用するのが好ましい。
In the present invention, after the first paint is applied, an acrylic silicon resin paint containing potassium titanate is applied as the second paint.
Examples of the acrylic silicon resin used in the present invention include dimethylpolysiloxane-based, phenylmethylpolysiloxane-based, and methylhydrogenpolysiloxane-based silicon resins. Among them, it is preferable to use a dimethylpolysiloxane system from the viewpoints of performance such as flexibility imparting effect and heat resistance, and cost.
アクリルシリコン樹脂中に配合されるチタン酸カリウムは、一般式：Ｋ２Ｏ・ｎＴｉＯ２で表される結晶質の無機化合物（多結晶体）である。なかでも、６チタン酸カリウム（Ｋ２Ｏ・６ＴｉＯ２）、８チタン酸カリウム（Ｋ２Ｏ・８ＴｉＯ２）は、熱的安定性、補強性等に優れている点で好ましく使用される。これらのチタン酸カリウムは、単一種の使用であってもよく、または２種以上を複合して配合してもよい。配合するチタン酸カリウムは繊維状のものが好ましく、繊維長１０〜２０μｍ、繊維径が０．２〜０．８μｍのものが好ましい。大き過ぎると、塗料調製における分散性、作業性が悪く、逆に微細過ぎる粒子では、比表面積の増加により塗料の増粘傾向が顕著となるため好ましくない。なかでもアスペクト比（長さ／幅）が約５以上の形態を有するものは防食機能や塗膜強度を強化するので好ましく使用することができる。 The potassium titanate blended in the acrylic silicon resin is a crystalline inorganic compound (polycrystal) represented by the general formula: K 2 O · nTiO 2 . Among these, potassium 6 titanate (K 2 O · 6TiO 2 ) and potassium 8 titanate (K 2 O · 8TiO 2 ) are preferably used because they are excellent in thermal stability, reinforcement and the like. These potassium titanates may be used alone or in combination of two or more. The potassium titanate to be blended is preferably in the form of a fiber, with a fiber length of 10 to 20 μm and a fiber diameter of 0.2 to 0.8 μm. If the particle size is too large, the dispersibility and workability in the preparation of the coating material are poor. On the other hand, too fine particles are not preferable because the tendency of the coating to thicken becomes remarkable due to an increase in specific surface area. Among them, those having an aspect ratio (length / width) of about 5 or more can be preferably used because they enhance the anticorrosion function and the coating film strength.
樹脂組成物中のチタン酸カリウムの配合量は、樹脂固形分１００重量部に対し５重量部以上が好ましく、より好ましくは１０〜５０重量部である。多く配合すると塗料調製や塗装作業性が低下するので、約８０重量部を上限とするのが適当である。 As for the compounding quantity of the potassium titanate in a resin composition, 5 weight part or more is preferable with respect to 100 weight part of resin solid content, More preferably, it is 10-50 weight part. If a large amount is blended, paint preparation and painting workability are lowered, so it is appropriate that the upper limit is about 80 parts by weight.
第２の塗料の塗膜の乾燥膜厚は１０μｍ以上、好ましくは２０〜８０μｍである。１０μｍ未満であると防錆性、塩素イオン透過の抑制性能、塗膜強度が不充分となるため好ましくない。第２の塗料塗布後に、さらに同種の塗料を重ねて塗布しても構わない。 The dry film thickness of the coating film of the second paint is 10 μm or more, preferably 20 to 80 μm. If it is less than 10 μm, the rust prevention property, the suppression performance of permeation of chlorine ions, and the coating film strength are insufficient, which is not preferable. After applying the second paint, the same kind of paint may be further applied.
また、母材との密着性の向上、防錆性の向上、塩素イオン透過の抑制の観点から、第２の塗料の乾燥膜厚は、第１の塗料の膜厚の１倍以上、好ましくは１．２〜２．５倍であることが好ましい。第２の塗料として使用するアクリルシリコン樹脂塗料の膜厚が、第１の塗料として使用するエポキシ樹脂塗料の膜厚の１倍未満であると、塗装面との接着が不十分となり、防錆性、塩素イオンの透過抑制性能等が低下するため、好ましくない。また、２．５倍以上の厚さで第２の塗料を塗装しても、コストが増大するだけで、防錆性、塩素イオンの透過抑制性能等が増した厚さに見合って向上することはない。 Also, from the viewpoint of improving adhesion with the base material, improving rust prevention, and suppressing chloride ion permeation, the dry film thickness of the second paint is at least one times the film thickness of the first paint, preferably It is preferable that it is 1.2 to 2.5 times. When the film thickness of the acrylic silicone resin paint used as the second paint is less than 1 times the film thickness of the epoxy resin paint used as the first paint, the adhesion to the painted surface becomes insufficient, and rust prevention In addition, the chlorine ion permeation suppressing performance is not preferable. In addition, even if the second paint is applied with a thickness of 2.5 times or more, the cost is only increased, and the rust prevention, chloride ion permeation suppression performance, etc. are improved in accordance with the increased thickness. There is no.
本発明の塗料を塗布するにあたり、塗装の対象となる被塗装素材は特に限定しないが、鋼材等の金属素材に好適に用いることができる。被塗装表面上の旧塗膜や錆が発生している場合は、各種のブラスト、ディスクサンダー等の電動工具やスクレーパー、ワイヤーブラシ等の手工具で錆を除去して下地処理を行う。
下地処理を施した後、本発明の第１の塗料及び第２の塗料を塗布するが、刷毛、ヘラ、ローラー、スプレー、コーターなど公知の方法を用いて塗布することができる。
In applying the paint of the present invention, the material to be coated is not particularly limited, but can be suitably used for metal materials such as steel. If old paint film or rust is generated on the surface to be coated, remove the rust with various power tools such as blasting and disc sander, and hand tools such as scrapers and wire brushes, and perform the ground treatment.
After the ground treatment, the first paint and the second paint of the present invention are applied, and can be applied using a known method such as a brush, a spatula, a roller, a spray, or a coater.
本発明をより具体的に実施例により説明する。なお、本発明は、以下の実施例に限定されるものではない。 The present invention will be described more specifically with reference to examples. The present invention is not limited to the following examples.
（塗膜形成用鋼板の作製）
両表面をサンドブラストした縦横８０×８０ｍｍ、厚さ３ｍｍの冷間圧延鋼板（ＳＳ−４００）を、３％食塩水に１分浸漬した後、４０℃９５％の恒温恒湿槽内で８日間静置し、錆を発生させた。次に、錆を発生させた鋼板の浮き錆を、電動カップワイヤーブラシで除錆した（２種ケレン）後、水洗し、乾燥させて、塗膜形成用の鋼板を作製した。
(Production of steel sheet for coating film formation)
Cold-rolled steel sheets (SS-400) 80 × 80 mm long and 3 mm thick, sandblasted on both surfaces, were immersed in 3% saline for 1 minute and then allowed to stand still in a constant temperature and humidity chamber at 40 ° C. and 95% for 8 days. And rust was generated. Next, the floating rust of the steel plate that generated rust was removed with an electric cup wire brush (type 2 keren), then washed with water and dried to prepare a steel plate for coating film formation.
（実施例１）
第１の塗料として、分子量３０００〜５０００のビスフェノールＡ型エポキシ樹脂１００重量部に対し、粒径５μｍ〜１５μｍのアルミ鱗片顔料を５０重量部と、平均粒径５μｍの亜鉛金属粉末を５０重量部含有する塗料Ａを調製した。
また、第２の塗料として、平均分子量４１０００のアクリルシリコン樹脂１００重量部に対し、繊維長１０〜２０μｍ、繊維径が０．２〜０．８μｍの繊維状チタン酸カリウムを３０重量部含有する塗料Ｂを調製した。
まず、上記のようにして作成した塗膜形成用の鋼板に塗料Ａを、ローラーを用いて塗布し、２５℃で２４時間乾燥させ、乾燥膜厚が７０μｍの塗膜１を形成した。次いで、塗料Ａの乾燥塗膜の上に塗料Ｂを、ローラーを用いて塗布し、２５℃で２４時間乾燥させ、乾燥膜厚が７０μｍの塗膜２を形成した。塗膜２を形成した後、さらに、塗料Ｂを同様に塗布、乾燥して、乾燥膜厚が７０μｍの塗膜３を形成した。このように塗料Ａを１回、塗料Ｂを２回塗布して塗膜１〜３でなる合計膜厚が２１０μｍの試験片Ｘを作製した。
Example 1
As a first coating material, 50 parts by weight of an aluminum flake pigment having a particle size of 5 to 15 μm and 50 parts by weight of zinc metal powder having an average particle size of 5 μm per 100 parts by weight of a bisphenol A type epoxy resin having a molecular weight of 3000 to 5000 A coating A was prepared.
Further, as a second coating material, a coating material containing 30 parts by weight of fibrous potassium titanate having a fiber length of 10 to 20 μm and a fiber diameter of 0.2 to 0.8 μm with respect to 100 parts by weight of an acrylic silicon resin having an average molecular weight of 41000 B was prepared.
First, the coating material A was applied to the steel sheet for forming a coating film prepared as described above using a roller and dried at 25 ° C. for 24 hours to form a coating film 1 having a dry film thickness of 70 μm. Subsequently, the coating material B was apply | coated using the roller on the dry coating film of the coating material A, and it was made to dry at 25 degreeC for 24 hours, and the coating film 2 with a dry film thickness of 70 micrometers was formed. After the coating film 2 was formed, the coating material B was similarly applied and dried to form a coating film 3 having a dry film thickness of 70 μm. Thus, the test piece X with the total film thickness of 210 micrometers which consists of the coating films 1-3 by apply | coating the coating material A once and the coating material B twice was produced.
（比較例１）
第１の塗料として、分子量２００００〜３００００のエポキシ樹脂を含有する塗料Ｃを用い、第２の塗料として分子量が２００００〜３００００のアクリル系エポキシ樹脂を含有する塗料Ｄを用いた。
まず、実施例１で用いた鋼板と全く同じ鋼板に塗料Ｃを、ローラーを用いて塗布し、２５℃で２４時間乾燥させ乾燥膜厚が７０μｍの塗膜１を形成した。さらに、塗料Ｃを同様に塗布して、乾燥膜厚が７０μｍの塗膜２を形成した。その後、塗料Ｄを、塗料Ｃの２層の乾燥塗膜の上に同様に塗布、乾燥して、乾燥膜厚が７０μｍの塗膜３を形成した。こうして、合計膜厚が２１０μｍの試験片Ｙを作製した。
(Comparative Example 1)
A paint C containing an epoxy resin having a molecular weight of 20000 to 30000 was used as the first paint, and a paint D containing an acrylic epoxy resin having a molecular weight of 20000 to 30000 was used as the second paint.
First, the paint C was applied to the same steel plate as that used in Example 1 using a roller and dried at 25 ° C. for 24 hours to form a coating film 1 having a dry film thickness of 70 μm. Furthermore, the coating material C was similarly applied to form a coating film 2 having a dry film thickness of 70 μm. Thereafter, the coating material D was applied in the same manner on the two dry coating films of the coating material C and dried to form a coating film 3 having a dry film thickness of 70 μm. Thus, a test piece Y having a total film thickness of 210 μm was produced.
（比較例２）
第１の塗料として塗料Ｂのみを用いて、合計膜厚が２１０μｍの試験片Ｚを作製した。すなわち、塗料Ｂを、ローラーを用いて塗布後、２５℃で２４時間乾燥させ、乾燥膜厚が７０μｍの塗膜１を形成した。これを、さらに２回繰り返して、それぞれ乾燥膜厚が７０μｍの塗膜２及び塗膜３を形成した。こうして、塗料Ｂのみの合計膜厚が２１０μｍの試験片Ｚを作製した。
(Comparative Example 2)
A test piece Z having a total film thickness of 210 μm was prepared using only the paint B as the first paint. That is, the coating material B was applied using a roller and then dried at 25 ° C. for 24 hours to form a coating film 1 having a dry film thickness of 70 μm. This was further repeated twice to form a coating film 2 and a coating film 3 each having a dry film thickness of 70 μm. In this way, a test piece Z having a total film thickness of only the coating material B of 210 μm was produced.
［耐食性試験］
ＡＳＴＭ Ｃ８６８に準拠する試験器（山崎精機研究所製 ライニングテスタ ＬＡ−１５）を用いて、試験片の塗膜面が６０℃の２５重量％塩化ナトリウム水溶液と接するよう設置し、塗装していない面を１０℃に保持して３０日間耐食性試験を行った。
[Corrosion resistance test]
Using a tester compliant with ASTM C868 (Lined Tester LA-15, manufactured by Yamazaki Seiki Laboratories), the coating surface of the test piece is placed in contact with a 25% by weight sodium chloride aqueous solution at 60 ° C., and the surface is not painted Was kept at 10 ° C. and a 30-day corrosion resistance test was conducted.
試験後の塗膜の外観を膨れの大きさ、密度について評価し、塗膜の付着性をＪＩＳ Ｋ５６００−５−７に準拠して測定した。 The appearance of the coating film after the test was evaluated with respect to the size and density of the swelling, and the adhesion of the coating film was measured according to JIS K5600-5-7.
また、試験後の試験片は、塗装面に対して垂直方向で切断して、電子線マイクロアナライザ（ＥＰＭＡ）（日本電子製、Ｓｕｐｅｒ Ｐｒｏｂｅ ＪＸＡ−８９００Ｒ型）にて、塗装面に対して垂直方向の断面における塩素イオンの浸透、透過の有無を測定した。なお、塗膜の膜厚はＪＩＳ Ｋ５６００−１−７に準拠して、電磁誘導式厚計（株式会社サンコウ電子研究所 ＳＭ−１１００型）で測定した。
これらの測定結果を表１に示す。
In addition, the test piece after the test was cut in a direction perpendicular to the painted surface, and perpendicular to the painted surface with an electron beam microanalyzer (EPMA) (manufactured by JEOL Ltd., Super Probe JXA-8900R type). The presence or absence of permeation and permeation of chloride ions in the cross section was measured. In addition, the film thickness of the coating film was measured with an electromagnetic induction type thickness meter (Sanko Electronics Laboratory SM-1100 type) in accordance with JIS K5600-1-7.
These measurement results are shown in Table 1.
実施例１の塗装は、耐食性試験後においても塗膜に膨れは発生せず、塗膜の付着性も良好であった。また、塗膜の断面のＥＰＭＡ測定においても塩素は検出されず、塗膜を塩素が透過しないことが確認された。これに対し、比較例１，２の塗装は、耐食性試験後に、塗膜に膨れが発生し、付着強度も低く、塗膜が母材から剥離したことから、外観及び付着性が満足できるものではなかった。 In the coating of Example 1, the coating film did not swell even after the corrosion resistance test, and the coating film adhesion was also good. Moreover, chlorine was not detected in the EPMA measurement of the cross section of the coating film, and it was confirmed that chlorine did not permeate the coating film. On the other hand, the coatings of Comparative Examples 1 and 2 were swelled in the coating film after the corrosion resistance test, the adhesion strength was low, and the coating film was peeled off from the base material. There wasn't.
［塗膜の塩素透過性］
第２の塗料（上塗り塗料）として用いた塗料Ｂ及び塗料Ｄの塩素イオン透過度を旧ＪＩＳ Ｋ５４００（８．１８塩素イオン透過度）に準拠して測定した。
具体的には、ガラス板に離型紙を敷き、その上に塗料を泡が入らないように塗装し、７日間乾燥保持した後、離型紙から塗膜をはがして直径約７０ｍｍの円形に切り取り、塗膜試験片を作成した。試験片を測定セルの間に取り付け、一方のセルに脱イオン水を、もう一方のセルに２５重量％の塩化ナトリウム水溶液をそれぞれ２００ｍＬ入れ、４０℃で３０日間放置後、脱イオン水側のセルから溶液を採取し、イオンクロマト分析装置を用いて、塩素イオン濃度を測定し、塗料ＢとＤの塗膜の塩素イオン透過量を算出した。結果を表２に示す。
[Chlorine permeability of coating film]
The chlorine ion permeability of paint B and paint D used as the second paint (top coat paint) was measured according to the former JIS K5400 (8.18 chloride ion permeability).
Specifically, a release paper is laid on a glass plate, and paint is applied on the glass plate so that bubbles do not enter. After drying and holding for 7 days, the coating film is peeled off from the release paper and cut into a circle having a diameter of about 70 mm, A paint film test piece was prepared. Place a test piece between the measurement cells, put deionized water in one cell and 200 mL each of 25% by weight sodium chloride aqueous solution in the other cell, let stand at 40 ° C. for 30 days, then deionized water side cell The solution was sampled from the sample, and the chloride ion concentration was measured using an ion chromatography analyzer, and the chloride ion permeation amount of the coating films B and D was calculated. The results are shown in Table 2.
表２の結果から、本発明に用いる、繊維状のチタン酸カリウムを含有するアクリルシリコン樹脂の塗料Ｂで形成した塗膜は優れた遮塩性を有していることが分かる。 From the results shown in Table 2, it can be seen that the coating film formed from the acrylic silicon resin paint B containing fibrous potassium titanate used in the present invention has excellent salt-blocking properties.
本発明の塗装方法によると、塗膜の付着性が良好であり、膨れは発生しない、かつ優れた防錆性を有し、塩素イオンの透過抑制効果の高い防食塗膜を形成することができる。塩害暴露環境においても長期間防食効果を持続でき、従来の塗膜より塗り替え間隔が延長できることから、橋梁、タンク、プラント、湾岸設備等の鉄鋼構造物鋼構造物等への塗装に好適に使用することができる。 According to the coating method of the present invention, it is possible to form a corrosion-resistant coating film that has good adhesion of the coating film, does not swell, has excellent rust prevention properties, and has a high chloride ion permeation suppressing effect. . The anticorrosion effect can be maintained for a long time even in environments exposed to salt damage, and the repainting interval can be extended compared to conventional coatings, making it suitable for painting on steel structures such as bridges, tanks, plants, and bay facilities. be able to.
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| JPH06329959A (en) * | 1993-05-24 | 1994-11-29 | Kubota Corp | Anticorrosive coating composition |
| JPH078905A (en) * | 1993-06-28 | 1995-01-13 | Shinto Paint Co Ltd | Corrosion-proof coating method |
| JP2000042485A (en) * | 1998-07-31 | 2000-02-15 | Toagosei Co Ltd | Corrosion prevention of metal structure |
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| JPH06329959A (en) * | 1993-05-24 | 1994-11-29 | Kubota Corp | Anticorrosive coating composition |
| JPH078905A (en) * | 1993-06-28 | 1995-01-13 | Shinto Paint Co Ltd | Corrosion-proof coating method |
| JP2000042485A (en) * | 1998-07-31 | 2000-02-15 | Toagosei Co Ltd | Corrosion prevention of metal structure |
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