JP3203210B2 - Anticorrosion coating method - Google Patents
Anticorrosion coating methodInfo
- Publication number
- JP3203210B2 JP3203210B2 JP21468697A JP21468697A JP3203210B2 JP 3203210 B2 JP3203210 B2 JP 3203210B2 JP 21468697 A JP21468697 A JP 21468697A JP 21468697 A JP21468697 A JP 21468697A JP 3203210 B2 JP3203210 B2 JP 3203210B2
- Authority
- JP
- Japan
- Prior art keywords
- coating
- coating film
- anticorrosion
- parts
- epoxy resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は防食被覆方法に関
し、特に、高粘度のC重油やパーム油等の流動点の高い
動植物油を運搬する運搬船のカーゴタンクの底部の裏面
(バラストタンクの天井面)のように高温となる箇所に
長期防食性を付与すると共に密着性に優れている塗膜層
を形成するための防食被覆方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion coating method, and more particularly to a back surface (a ceiling surface of a ballast tank) of a cargo tank of a carrier for transporting animal and vegetable oils having a high pour point such as heavy C oil and palm oil having a high viscosity. The present invention relates to an anticorrosion coating method for providing a long-term anticorrosion property to a place where the temperature becomes high as in the above) and for forming a coating layer having excellent adhesion.
【0002】[0002]
【従来の技術】従来、流動点の高い動植物油を運搬する
運搬船のカーゴタンクの底部の裏面となるバラストタン
クの天井面には、通常、タールエポキシ樹脂塗料JIS
2種又は1種相当品が乾燥膜厚200〜250μmで塗
装されている。また、最近は、変性エポキシ樹脂塗料が
乾燥膜厚250〜300μmで塗装されることも多くな
ってきた。2. Description of the Related Art Conventionally, tar epoxy resin coating JIS is usually provided on a ceiling surface of a ballast tank which is a back surface of a bottom portion of a cargo tank of a carrier ship for transporting animal and vegetable oil having a high pour point.
Two or one equivalents are coated with a dry film thickness of 200 to 250 μm. Also, recently, the modified epoxy resin paint is often applied with a dry film thickness of 250 to 300 μm.
【0003】C重油やパーム油等は常温では粘度が高
く、流動性に乏しいため、荷積み及び荷降しの際にはそ
れらの荷物を加熱して粘度を低くし、作業性を良くする
のが通常である。その加熱温度は50〜70℃程度であ
ることが多いが、80℃以上にすることもある。このよ
うな高温物を荷積すると、バラストタンクの天井面(カ
ーゴタンクの底部の裏面)も積荷と同程度の温度に上昇
する。また、荷降し後には、バラストタンクに海水を注
入するが、冬期の海水は冷たく、5℃以下になることも
ある。このバラストタンクへの海水の注入により、タン
クは急冷却される。[0003] Heavy fuel oil or palm oil has a high viscosity at room temperature and has poor fluidity. Therefore, when loading and unloading, it is necessary to heat the luggage to lower the viscosity and improve workability. Is normal. The heating temperature is often about 50 to 70 ° C, but may be 80 ° C or more. When such a high-temperature object is loaded, the temperature of the ceiling surface of the ballast tank (the back surface at the bottom of the cargo tank) also rises to the same level as the load. After unloading, seawater is injected into the ballast tank, but the seawater in winter is cold and may be 5 ° C or less. By injecting seawater into the ballast tank, the tank is rapidly cooled.
【0004】このように、荷積み、荷降し、バラストタ
ンクへの注水の繰り返しにより、バラストタンクの天井
面は80〜5℃の範囲内での、時には80℃以上から5
℃以下への瞬時の温度変化を受け、塗膜の伸縮が激しい
環境に曝されることになる。そのため通常のバラストタ
ンク用塗料を用いて得た塗膜では早期にハガレ、ワレ等
の塗膜欠陥が生じ、腐食、錆の発生が生じ易いという問
題点があった。[0004] As described above, the loading, unloading and repeated pouring of water into the ballast tank cause the ceiling surface of the ballast tank to fall within the range of 80 to 5 ° C, sometimes from 80 ° C to 5 ° C.
Due to the instantaneous temperature change to below ℃, the coating film is exposed to an environment in which the expansion and contraction of the coating film is severe. For this reason, there is a problem in that a coating film obtained by using a normal ballast tank coating material causes coating film defects such as peeling and cracking at an early stage, and corrosion and rust easily occur.
【0005】[0005]
【発明が解決しようとする課題】本発明は、上記のよう
な諸問題、即ち、温度変化による塗膜の伸縮が激しい環
境に曝されると、早期にハガレ、ワレ等の塗膜欠陥が生
じ、腐食、錆の発生が生じ易いという問題点、腐食性物
質の透過による錆、フクレ、ハクリ等が発生するという
問題点を解決するものであり、本発明の目的は、上記の
ような環境下においても、長期間に亘り防食、防錆効果
を発揮すると共に密着性に優れた塗膜層を形成すること
のできる防食被覆方法を提供することにある。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, that is, when exposed to an environment in which the coating film expands and contracts sharply due to temperature changes, coating defects such as peeling and cracking occur early. It is intended to solve the problem that corrosion, rust easily occurs, and the problem that rust, blisters, peeling, etc. occur due to permeation of corrosive substances. It is another object of the present invention to provide an anticorrosion coating method capable of exhibiting anticorrosion and rust prevention effects over a long period of time and forming a coating film layer having excellent adhesion.
【0006】[0006]
【課題を解決するための手段】本発明者らは、上記の目
的を達成するために鋭意検討の結果、有機又は無機ショ
ッププライマーを塗布した後、可撓性エポキシ樹脂を特
定量で配合した特定の塗料を塗装することにより上記目
的が達成されることを見いだし、本発明に到達した。即
ち、本発明の防食被覆方法は、 (i)被塗物上にショッププライマーを塗布し、常温乾
燥させる工程、及び (ii)生成ショッププライマー塗膜上に、可撓性エポキ
シ樹脂(固形分)が全樹脂固形分の1〜30重量%を占
めており、塗装後の塗膜のガラス転移温度Tg(以下、
単にTgと記載する)が50℃以上となり、且つ塗膜の
伸び率が10%以上となる防食塗料組成物を塗布し、常
温乾燥させる工程を含むことを特徴とする。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and have found that after applying an organic or inorganic shop primer, a flexible epoxy resin is blended in a specific amount. It has been found that the above object can be achieved by applying the above paint, and the present invention has been achieved. That is, the anticorrosion coating method of the present invention includes: (i) a step of applying a shop primer on an object to be coated and drying at room temperature; and (ii) a flexible epoxy resin (solid content) on the generated shop primer coating. Occupies 1 to 30% by weight of the total resin solids, and the glass transition temperature Tg of the coating film after coating (hereinafter, referred to as
(Hereinafter simply referred to as Tg) and a step of applying an anticorrosive coating composition having a coating film elongation of 10% or more and drying at room temperature.
【0007】[0007]
【発明の実施の形態】以下に、本発明の実施の形態につ
いて詳細に説明する。本発明の防食被覆方法で用いるこ
とのできるショッププライマーとしては、ウォッシュプ
ライマー、ジンクリッチプライマー、ノンジンクプライ
マーなどを挙げることができ、特にジンクリッチプライ
マーが好ましい。Embodiments of the present invention will be described below in detail. Examples of the shop primer that can be used in the anticorrosion coating method of the present invention include a wash primer, a zinc-rich primer, and a non-zinc primer, and a zinc-rich primer is particularly preferable.
【0008】有機質系のジンクリッチプライマーのビヒ
クルとしては、エポキシ樹脂−ポリアミド樹脂の組合
せ、塩化ゴム、ポリスチレン樹脂、シリコン樹脂等が挙
げられる。又、無機質系のジンクリッチプライマーのビ
ヒクルとしては、エチルシリケート、リチウムシリケー
ト、ナトリウムシリケート、カリウムシリケート、アン
モニウムシリケート等が挙げられ、特に本発明の如き目
的に対して好ましいビヒクルはエチルシリケート、カリ
ウムシリケート、リチウムシリケートである。Examples of the vehicle of the organic zinc-rich primer include a combination of an epoxy resin and a polyamide resin, a chlorinated rubber, a polystyrene resin, and a silicone resin. Examples of the inorganic zinc-rich primer vehicle include ethyl silicate, lithium silicate, sodium silicate, potassium silicate, ammonium silicate, and the like. Lithium silicate.
【0009】本発明の防食被覆方法で上塗塗料として使
用することのできる防食塗料組成物は、可撓性エポキシ
樹脂(固形分)が全樹脂固形分の1〜30重量%を占め
ており、塗装後の塗膜のTgが50℃以上となり、且つ
塗膜の伸び率が10%以上となる防食塗料組成物であ
る。上記の可撓性エポキシ樹脂としては、ポリエチレン
グリコールグリシジルエーテル型、ポリプロピレングリ
コールグリシジルエーテル型、ビスフェノールAアルキ
レンオキサイド付加物のグリシジルエーテル型、ビスフ
ェノールA重合脂肪酸付加物のグリシジルエーテル型、
ダイマー酸ジグリシジルエステル型の各種エポキシ樹
脂、或いは、これらの2種以上の混合物などが代表的な
ものとして挙げることができるが、これらに限定される
ものではない。In the anticorrosion coating composition which can be used as a top coat in the anticorrosion coating method of the present invention, the flexible epoxy resin (solid content) accounts for 1 to 30% by weight of the total resin solids. This is an anticorrosion coating composition in which the Tg of the subsequent coating film is 50 ° C. or more, and the elongation percentage of the coating film is 10% or more. As the flexible epoxy resin, polyethylene glycol glycidyl ether type, polypropylene glycol glycidyl ether type, glycidyl ether type of bisphenol A alkylene oxide adduct, glycidyl ether type of bisphenol A polymerized fatty acid adduct,
Representative examples include, but are not limited to, various epoxy resins of the dimer acid diglycidyl ester type, and mixtures of two or more of these.
【0010】本発明の防食被覆方法で使用することので
きる防食塗料組成物は、上記の可撓性エポキシ樹脂を必
須成分として含有し、更に、従来公知の防食塗料組成物
に用いられている諸成分を同様の配合割合で含有する。
即ち、本発明の防食被覆方法で使用することのできる防
食塗料組成物は、上記の可撓性エポキシ樹脂以外に、ア
ミン硬化エポキシ樹脂、イソシアネート硬化ポリオール
樹脂、塩素化樹脂、クマロンインデン樹脂、塩化ビニル
樹脂、キシレン樹脂、ケトン樹脂、石油樹脂、コールタ
ールピッチや膨潤炭のような瀝青質、或いは、これらの
2種以上の混合物などの結合剤、キシレン、トルエンな
どの芳香族炭化水素、アルコール、ケトンなどの有機溶
剤を含有することができ、更に必要に応じて、酸化チタ
ン、酸化鉄、カーボンブラックなどの着色顔料、タル
ク、炭酸カルシウム、硫酸バリウム、マイカなどの体質
顔料、その他、沈澱防止剤、流れ止め剤、ハジキ防止剤
などの各種添加剤を含有することができる。[0010] The anticorrosion coating composition which can be used in the anticorrosion coating method of the present invention contains the above-mentioned flexible epoxy resin as an essential component. The components are contained in the same mixing ratio.
That is, the anticorrosion coating composition that can be used in the anticorrosion coating method of the present invention includes, in addition to the above flexible epoxy resin, an amine-cured epoxy resin, an isocyanate-cured polyol resin, a chlorinated resin, a cumarone indene resin, and a chloride. Vinyl resins, xylene resins, ketone resins, petroleum resins, bitumens such as coal tar pitch and swollen charcoal, or binders such as mixtures of two or more thereof, xylenes, aromatic hydrocarbons such as toluene, alcohols, It can contain organic solvents such as ketones, and if necessary, coloring pigments such as titanium oxide, iron oxide, and carbon black; extenders such as talc, calcium carbonate, barium sulfate, and mica; and other precipitation inhibitors And various additives such as a flow stopper, a repelling inhibitor and the like.
【0011】上記の防食塗料組成物においては、可撓性
エポキシ樹脂(固形分)が該可撓性エポキシ樹脂を含め
た全樹脂固形分の1〜30重量%、好ましくは3〜25
重量%を占める。可撓性エポキシ樹脂(固形分)の含有
量が全樹脂固形分の1重量%未満である場合には、本発
明で目的とする効果が不十分になるので好ましくない。
逆に30重量%を超えると塗膜が十分な物理的強度を有
さなくなって塗膜欠陥を生じる傾向が大きくなるので好
ましくない。In the above anticorrosion coating composition, the flexible epoxy resin (solid content) is 1 to 30% by weight, preferably 3 to 25% by weight of the total resin solids including the flexible epoxy resin.
Accounts for% by weight. When the content of the flexible epoxy resin (solid content) is less than 1% by weight of the total resin solid content, the effects intended in the present invention become insufficient, which is not preferable.
Conversely, if the content exceeds 30% by weight, the coating film does not have sufficient physical strength, and the tendency to cause coating film defects is undesirably increased.
【0012】また、上記の防食塗料組成物は、塗装後の
塗膜のTgが50℃以上、好ましくは70℃以上とな
り、塗膜の伸び率が10%以上、好ましくは12%以上
となるものである。塗装後の塗膜のTgが50℃未満で
ある場合には、高温環境下において塗膜の劣化が早くな
る傾向があるので好ましくない。また、塗膜の伸び率が
10%未満である場合には、塗膜が瞬時の温度変化によ
る伸縮応力を緩和することが困難となる傾向があるので
好ましくない。The above anticorrosion coating composition has a Tg of a coated film of 50 ° C. or more, preferably 70 ° C. or more, and an elongation of the coated film of 10% or more, preferably 12% or more. It is. If the Tg of the coating film after coating is less than 50 ° C., the coating film tends to deteriorate quickly in a high-temperature environment, which is not preferable. Further, when the elongation percentage of the coating film is less than 10%, it is not preferable because the coating film tends to have difficulty in relaxing the stretching stress due to an instantaneous temperature change.
【0013】本発明の防食被覆方法においては、先ずサ
ンドブラストやショットブラストなどで十分に錆落とし
をした鉄鋼表面に対して、前記のショッププライマーを
スプレーや刷毛塗り等により塗布する。本発明の防食被
覆方法においては、前記のショッププライマーの乾燥塗
膜の厚さは10〜30μm、好ましくは10〜20μm
である。該膜厚が10μm未満である場合には、目的と
する防食性は得られ難く、逆に膜厚が30μmを超える
と、ショッププライマーの乾燥塗膜層内部において凝集
破壊を起こし易く、このため、僅かな衝撃、機械的応
力、熱ショックにどにより塗膜層が剥離し易くなるとい
う欠点が生じるため好ましくない。上記のショッププラ
イマーを常温乾燥させて得られたショッププライマー塗
膜上に、前記防食塗料組成物を刷毛、スプレー塗装機、
ローラー等により乾燥塗膜の厚さが200〜500μ
m、好ましくは250〜300μmとなるように塗装
し、常温乾燥させて仕上げる。In the anticorrosion coating method of the present invention, first, the shop primer is applied by spraying, brushing or the like to the steel surface which has been sufficiently rusted off by sand blasting or shot blasting. In the anticorrosion coating method of the present invention, the dry thickness of the shop primer is 10 to 30 μm, preferably 10 to 20 μm.
It is. When the film thickness is less than 10 μm, it is difficult to obtain the desired anticorrosion property. Conversely, when the film thickness exceeds 30 μm, cohesive failure easily occurs inside the dry coating layer of the shop primer. It is not preferable because the coating film layer is easily peeled off due to slight impact, mechanical stress or thermal shock. On the shop primer coating film obtained by drying the shop primer at room temperature, brush the anticorrosion coating composition, spray coating machine,
The thickness of the dried coating film is 200-500μ by a roller etc.
m, preferably 250 to 300 μm, and dried at room temperature to finish.
【0014】[0014]
【実施例】以下に、実施例及び比較例に基づいて本発明
を更に詳細に説明するが、本発明はこれらの実施例によ
って限定されるものではない。なお、実施例及び比較例
中の「部」は「重量部」である。先ず、下記の配合の各
ショッププライマー、各防食塗料組成物を調製した。ジ
ンクリッチプライマーの調製:The present invention will be described below in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. In the examples and comparative examples, "parts" is "parts by weight". First, each shop primer and each anticorrosion paint composition having the following composition were prepared. Preparation of zinc rich primer:
【0015】[配合1] 亜鉛末 30部 防錆顔料 5部 耐熱顔料 13部 沈殿防止剤 3部 イソブタノール 13部 イソプロパノール 13部 トルエン 13部 エチルシリケート溶液 10部 (エチルシリケート溶液は使用時に混合した)。[Formulation 1] Zinc powder 30 parts Rust preventive pigment 5 parts Heat resistant pigment 13 parts Precipitation inhibitor 3 parts Isobutanol 13 parts Isopropanol 13 parts Toluene 13 parts Ethyl silicate solution 10 parts (Ethyl silicate solution was mixed at the time of use) .
【0016】[配合2] 亜鉛末 70部 エチルシリケート溶液 10部 トルエン 10部 セロソルブ系溶剤 10部 (亜鉛末は使用時に混合した)。[Formulation 2] Zinc powder 70 parts Ethyl silicate solution 10 parts Toluene 10 parts Cellosolve solvent 10 parts (Zinc powder was mixed at the time of use).
【0017】[配合3] エポキシ樹脂 6部 亜鉛末 75部 沈殿防止剤 2部 キシレン 10部 MIBK 5部 変性ポリアミン樹脂 2部 (変性ポリアミン樹脂は使用時に混合した)。[Formulation 3] Epoxy resin 6 parts Zinc powder 75 parts Precipitating inhibitor 2 parts Xylene 10 parts MIBK 5 parts Modified polyamine resin 2 parts (Modified polyamine resin was mixed at the time of use).
【0018】なお、配合1〜3において、エチルシリケ
ート溶液としてコルコート40(日本コルコート社製商
品名、平均縮合度4〜5程度の鎖状、分岐状のテトラエ
チルオルソシリケートの縮合体混合物の固形分濃度40
%のアルコール溶液)を使用し、エポキシ樹脂としてエ
ポキシ当量450〜500のエポキシ樹脂を使用し、変
性ポリアミン樹脂としてアミン価80〜120の変性ポ
リアミン樹脂を使用した。In Formulas 1 to 3, the solid content concentration of Colcoat 40 (trade name, manufactured by Nippon Colcoat Co., Ltd., a chain or branched condensate of tetraethylorthosilicate having an average degree of condensation of about 4 to 5) in Formulations 1 to 3 was used. 40
% Alcohol solution), an epoxy resin having an epoxy equivalent of 450 to 500 was used as the epoxy resin, and a modified polyamine resin having an amine value of 80 to 120 was used as the modified polyamine resin.
【0019】防食塗料組成物の調製:後記の表1に示し
た成分のうち、硬化剤であるポリアミン樹脂及びポリア
ミド樹脂成分以外の全成分を表1に示した量(重量部)
比でサンドミルにて2時間混練して各々の配合物を調製
した。そして、塗装直前にそれらの配合物にポリアミン
樹脂又はポリアミド樹脂成分を表1に示した量(重量
部)比で混合して防食塗料組成物を調製した。Preparation of anticorrosion coating composition: Of the components shown in Table 1 below, all components other than the polyamine resin and the polyamide resin component which are curing agents are the amounts shown in Table 1 (parts by weight).
Each mixture was kneaded at a ratio in a sand mill for 2 hours to prepare each formulation. Immediately before coating, a polyamine resin or a polyamide resin component was mixed with the blended components in the amounts (parts by weight) shown in Table 1 to prepare an anticorrosive coating composition.
【0020】実施例1〜6及び比較例1〜6 ショットブラスト鋼材(JIS G 3101、70×
150×3.2mm)の表面をキシレンで脱脂し、乾燥
させた。次いで、表2に示した配合番号のショッププラ
イマーをエアスプレーにて乾燥膜厚が15±5μmにな
るように塗装し、20℃、75%RHで7日間乾燥させ
てショッププライマー塗膜を得た。次いで、そのショッ
ププライマー塗膜の上に表2に示した配合番号の防食塗
料組成物をエアースプレーにて乾燥膜厚が250〜30
0μmになるように塗装し、20℃、75%RHで7日
間乾燥させた。得られた塗板につき、ヒートサイクル試
験、90℃塩水浸漬試験を下記の方法により行った。Examples 1 to 6 and Comparative Examples 1 to 6 Shot blasted steel (JIS G 3101, 70 ×
(150 × 3.2 mm) was degreased with xylene and dried. Next, a shop primer having a formulation number shown in Table 2 was applied by air spray so that the dry film thickness became 15 ± 5 μm, and dried at 20 ° C. and 75% RH for 7 days to obtain a shop primer coating film. . Then, a dry film thickness of 250 to 30 was applied to the anticorrosive paint composition having the composition number shown in Table 2 on the shop primer coating film by air spray.
It was applied to a thickness of 0 μm and dried at 20 ° C. and 75% RH for 7 days. The obtained coated plate was subjected to a heat cycle test and a 90 ° C. salt water immersion test by the following methods.
【0021】<ヒートサイクル試験>塗膜の表面を10
0℃まで加熱上昇させ、次いで5℃の氷水に漬けた。こ
の操作を10回繰り返した後、濃度3重量%の食塩水を
満たした容器に試験板を浸漬し、60℃に保持し、1週
間静置した。この操作を1サイクルとし、15サイクル
の操作を行った。 <90℃塩水浸漬試験>濃度3重量%の食塩水を満たし
た容器中に試験板を浸漬し、90℃に保持し、4ヶ月間
静置した。<Heat cycle test>
The mixture was heated to 0 ° C. and then immersed in 5 ° C. ice water. After repeating this operation 10 times, the test plate was immersed in a container filled with a 3% by weight saline solution, kept at 60 ° C., and allowed to stand for one week. This operation was defined as one cycle, and the operation was performed for 15 cycles. <90 ° C. Salt Water Immersion Test> The test plate was immersed in a container filled with a 3% by weight saline solution, kept at 90 ° C., and allowed to stand for 4 months.
【0022】ヒートサイクル試験、90℃塩水浸漬試験
の後に塗膜の付着力を測定し、また塗膜外観を観察し
た。更に、これらの試験の前の塗膜の付着力と試験後の
塗膜の付着力から塗膜の付着力低下率を求めた。これら
を下記の表3の評価基準に基づいて評価した。その結果
は下記の表4に示す通りであった。また、それぞれの単
離塗膜の伸び率及びTgを測定し、塗膜性能との関係を
把握した。After the heat cycle test and the 90 ° C. salt water immersion test, the adhesion of the coating film was measured, and the appearance of the coating film was observed. Further, the rate of decrease in the adhesion of the coating film was determined from the adhesion of the coating film before the test and the adhesion of the coating film after the test. These were evaluated based on the evaluation criteria of Table 3 below. The results were as shown in Table 4 below. Further, the elongation percentage and Tg of each isolated coating film were measured, and the relationship with the coating film performance was grasped.
【0023】[0023]
【表1】 [Table 1]
【0024】[0024]
【表2】 [Table 2]
【0025】[0025]
【表3】 [Table 3]
【0026】[0026]
【表4】 [Table 4]
【0027】表4に示した評価結果からも明かなよう
に、本発明の防食被覆方法である実施例1〜6の方法で
得た塗膜については優れた防食性及び耐久性を有してい
た。一方、可撓性エポキシ樹脂の配合量が全樹脂固形分
の30重量%を超える塗料組成物を用いた比較例1の場
合には塗膜の物理的強度が不十分であり、ヒートサイク
ル試験、90℃塩水浸漬試験に耐えることができなかっ
た。また、塗装後の塗膜の伸び率が10%未満である塗
料組成物を用いた比較例2、5及び6の場合には耐ヒー
トサイクル性が悪く、塗装後の塗膜の伸び率が10%未
満で塗膜のTgが50℃未満である塗料組成物を用いた
比較例3の場合には耐ヒートサイクル性及び90℃塩水
浸漬の両方共悪く、塗装後の塗膜のTgが50℃未満で
ある塗料組成物を用いた比較例4の場合には90℃塩水
浸漬性が悪い結果となり、好ましくないものであった。As is clear from the evaluation results shown in Table 4, the coating films obtained by the methods of Examples 1 to 6, which are the anticorrosion coating methods of the present invention, have excellent anticorrosion properties and durability. Was. On the other hand, in the case of Comparative Example 1 in which the blending amount of the flexible epoxy resin exceeds 30% by weight of the total resin solids, the physical strength of the coating film was insufficient, and the heat cycle test was conducted. It could not withstand the 90 ° C. salt water immersion test. In the case of Comparative Examples 2, 5, and 6 using a coating composition in which the elongation percentage of the coating film after coating was less than 10%, the heat cycle resistance was poor, and the elongation percentage of the coating film after coating was 10%. %, The heat cycle resistance and the 90 ° C. salt water immersion were both poor in the case of Comparative Example 3 using a coating composition in which the Tg of the coating film was less than 50 ° C. and the Tg of the coating film after coating was 50 ° C. In the case of Comparative Example 4 using a coating composition of less than 90 ° C., the salt water immersion property at 90 ° C. was poor, which was not preferable.
【0028】[0028]
【発明の効果】本発明の防食被覆方法は、温度変化によ
る伸縮応力を緩和することができ且つ長期に亘って防食
性を維持できる塗膜を形成することのできる防食被覆方
法であり、瞬時の温度変化を受ける箇所を塗装するのに
適している。The anticorrosion coating method according to the present invention is an anticorrosion coating method capable of forming a coating film capable of relaxing expansion stress due to temperature change and maintaining the anticorrosion property for a long period of time. Suitable for painting places subject to temperature changes.
フロントページの続き (56)参考文献 特開 平6−71223(JP,A) 特開 平3−42078(JP,A) 特開 昭59−222275(JP,A) (58)調査した分野(Int.Cl.7,DB名) B05D 7/24 302 B05D 7/14 C09D 5/08 C09D 163/00 Continuation of the front page (56) References JP-A-6-71223 (JP, A) JP-A-3-42078 (JP, A) JP-A-59-222275 (JP, A) (58) Fields investigated (Int .Cl. 7 , DB name) B05D 7/24 302 B05D 7/14 C09D 5/08 C09D 163/00
Claims (1)
布し、常温乾燥させる工程、及び (ii)生成ショッププライマー塗膜上に、可撓性エポキ
シ樹脂(固形分)が全樹脂固形分の1〜30重量%を占
めており、塗装後の塗膜のガラス転移温度Tgが50℃
以上となり、且つ塗膜の伸び率が10%以上となる防食
塗料組成物を塗布し、常温乾燥させる工程を含むことを
特徴とする防食被覆方法。(1) a step of applying a shop primer on an object to be coated and drying at room temperature; and (ii) a step of applying a flexible epoxy resin (solid content) to the total resin solid content on the generated shop primer coating film. And the glass transition temperature Tg of the coated film after coating is 50 ° C.
A method for applying an anticorrosive coating composition having an elongation percentage of 10% or more and drying at room temperature.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21468697A JP3203210B2 (en) | 1997-08-08 | 1997-08-08 | Anticorrosion coating method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21468697A JP3203210B2 (en) | 1997-08-08 | 1997-08-08 | Anticorrosion coating method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1157614A JPH1157614A (en) | 1999-03-02 |
JP3203210B2 true JP3203210B2 (en) | 2001-08-27 |
Family
ID=16659917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21468697A Expired - Fee Related JP3203210B2 (en) | 1997-08-08 | 1997-08-08 | Anticorrosion coating method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3203210B2 (en) |
-
1997
- 1997-08-08 JP JP21468697A patent/JP3203210B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH1157614A (en) | 1999-03-02 |
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