JPH0313268B2 - - Google Patents

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Publication number
JPH0313268B2
JPH0313268B2 JP17961686A JP17961686A JPH0313268B2 JP H0313268 B2 JPH0313268 B2 JP H0313268B2 JP 17961686 A JP17961686 A JP 17961686A JP 17961686 A JP17961686 A JP 17961686A JP H0313268 B2 JPH0313268 B2 JP H0313268B2
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JP
Japan
Prior art keywords
parts
paint
weight
epoxy
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
Application number
JP17961686A
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Japanese (ja)
Other versions
JPS6335665A (en
Inventor
Masami Nishama
Hiroshi Nishida
Kunio Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Toryo KK
Original Assignee
Dai Nippon Toryo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dai Nippon Toryo KK filed Critical Dai Nippon Toryo KK
Priority to JP17961686A priority Critical patent/JPS6335665A/en
Publication of JPS6335665A publication Critical patent/JPS6335665A/en
Publication of JPH0313268B2 publication Critical patent/JPH0313268B2/ja
Granted legal-status Critical Current

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  • Compositions Of Macromolecular Compounds (AREA)
  • Epoxy Resins (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

〈産業上の利用分野〉 本発明は、発ガン性物質を含まず、かつ変色、
クラツク等の生じにくい塗膜を得るための、鉄管
用塗料組成物に関するものである。 〈従来の技術〉 従来から、水道鉄管、ガス鉄管等の鉄管用塗料
として、防錆性、耐水性、耐薬品性等に優れ、か
つ安価なタールエポキシ樹脂系塗料が、この種技
術分野に広く使用されていた。 〈発明が解決しようとする問題点〉 しかしながらタール、すなわちコールタールピ
ツチにはポリヘクス成分が含まれており、その中
には発ガン性物質が含まれていて、それ故市場要
求からタールエポキシ樹脂系塗料に代る塗料の開
発が望まれていた。しかしながらこれに代る安価
で、しかも塗膜性能の優れた塗料がなかつたので
前記欠点を有しているということが分つていなが
らも、タールエポキシ樹脂系塗料を使用せざるを
得ないというのが実状であつた。またタールエポ
キシ樹脂系塗料は、塗膜の乾燥過程1週間以内に
おいて夏場、強い紫外線が当たると、しばしば茶
色に変色したり、クラツクが生じたりすることが
あり、出荷時、美観を保持するために再度アルキ
ド樹脂系塗料等を塗装することが必要であつた。 本発明者は、このような現状にかんがみ、鋭意
研究した結果、発ガン性物質を含まず、安価でか
つ変色、クラツク等が生じにくく、さらに防錆
性、耐水性、耐薬品性等においては、タールエポ
キシ樹脂系塗料と同等の塗膜が得られる、鉄管用
塗料組成物を見出し、本発明を完成するに到つた
のである。 〈問題点を解決するための手段〉 すなわち本発明は、 (i) 1分子中に少なくとも2個以上のエポキシ基
を有するエポキシ当量150〜1000のエポキシ樹
脂及びエポキシ硬化剤 100重量部 (ii) ギルソナイト 50〜200重量部 (iii) 数平均分子量2000以下の石油樹脂 20〜180重量部 及び(iv)塩素化ポリエチレン
10〜50重量部からなる塗膜形成成分を含み、さら
に必要により体質顔料、防錆顔料、着色顔料等の
鉱物質フイラー、各種添加剤等を配合せしめた、
適宜の有機溶剤に溶解してなる、鉄管用塗料組成
物に関するものである。 本発明において、前記エポキシ樹脂としては、
従来からタールエポキシ樹脂系塗料に使用されて
いるエポキシ樹脂が使用出来る。またエポキシ当
量は約150〜1000のものが好適である。そのエポ
キシ当量が約150未満であると塗膜に粘着性が残
り乾燥性が悪く、約1000を越えると溶剤に溶解し
にくくなり、それだけ溶剤を多量に使用する必要
があるので塗料固形分が低くなる。すなわち市販
されているものとしては、エピコート828、同
834、同836、同1001、同DX−255(以下シエル化
学社製商品名)、アラルダイトGY−260(チバガ
イギー社製商品名)、DER330、同331、同337(以
上ダウ・ケミカル社製商品名)、エピクロン800
(大日本インキ化学工業社製商品名)等のビスフ
エノール型エポキシ樹脂;DEN431、同438(以上
ダウケミカル社製商品名)等のフエノールノポラ
ツク型エポキシ樹脂;アラルダイトCT−508(チ
バガイギー社製商品名)、等のポリグリコール型
エポキシ樹脂;エピクロン200、同400(以上大日
本インキ化学工業社製商品名)等のエステル型エ
ポキシ樹脂等が代表的なものとして挙げられる。 エポキシ樹脂剤としては、通常エポキシ樹脂の
硬化剤として利用されている化合物を用いること
が出来る。例えば、脂肪族ポリアミン、変性脂肪
族ポリアミン、ポリアミドアミン、芳香族ポリア
ミン、変性芳香族ポリアミン等が挙げられる。エ
ポキシ樹脂とエポキシ硬化剤の混合割合は、両者
の種類により任意に決定されるが、通常(硬化剤
の活性水素当量/エポキシ樹脂のエポキシ当量)
の値が0.5〜1.0の範囲で本来のエポキシ樹脂の性
能が発揮出来る。 次に本発明において使用される「ギルソナイ
ト」は、天然の鉱脈より産出される高軟化点で、
硫黄分、灰色の含有量の少ない黒褐色の炭化水素
化合物である。典型的組成は主成分として炭素分
75〜86%、水素分8〜15%、窒素分1.5〜5%、
酸素分1〜2%、灰分4%以下を含むものであ
り、その性状は平均分子量約1300〜1800、硬度
(moh,s scale)約2、針入度(25℃)約2、
比重1.03〜1.06、軟化点130〜190℃である。 本発明に於て、ギルソナイトは主に防錆性を高
めるために使用される。また、軟化点、硬度が高
いため石油系アスフアルトの如き、ベタ付きがみ
られず、しかも発ガン性物質をほとんど含んでい
ないという特徴を有している。ギルソナイトの配
合割合は前記エポキシ樹脂とエポキシ硬化剤100
重量部に対し50〜200重量部が適当である。なお、
ギルソナイトの配合割合が前記範囲より多過ぎる
と塗料が増粘する傾向にあり、そのため有機容剤
を多量に使用する必要があり、このことはそれだ
け塗料固形分が低くなり、また塗膜が脆弱になる
ため好ましくない。逆に、配合割合が前記範囲よ
り少ないと乾燥性が悪くなるので好ましくない。 次に本発明において使用される石油樹脂は、シ
クロペンタジエン、1.3−ペンタジエン等のC5
分の共役ジエンが一部環化重合した脂肪族系石油
樹脂;石油ナフサ分解で副生する重質油中からス
チレン誘導体、インデン等のC9留分を重合させ
た芳香族系石油樹脂;前記C5留分とC9留分を共
重合させた共重合系石油樹脂;芳香族系石油樹脂
を水素添加した樹脂やジシクロペンタジエンを重
合させた脂環族系石油樹脂等の、しかも数平均分
子量約500〜2000の低分子量重合体である。なお、
分子量が前記上限以上に高くなると塗膜の可撓性
等が低下するため好ましくない。 本発明に於ては、石油樹脂を塗料中に適当量配
合することにより、ギルソナイトとエポキシ樹脂
両者間の相溶性の悪さを解消することが出来、そ
の結果塗料化可能となる。また塗料はギルソナイ
トを多量に使用すると増粘傾向を示すが、該石油
樹脂を配合することにより、塗料粘度を適当に下
げ、また塗膜の乾燥性をよくすることができる。 前記石油樹脂の配合割合は、前記エポキシ樹脂
とエポキシ硬化剤100重量部に対し、20〜180重量
部が適当である。なお石油樹脂の配合割合が前記
範囲より多過ぎると塗膜の可撓性が悪くなり、脆
くなるという欠点があらわれる。逆に配合割合が
前記範囲より少ないと前述の効果が得られなくな
るので同様に好ましくない。 次に本発明において使用される塩素化ポリエチ
レンは、ポリエチレンを四塩化炭素、クロロホル
ム、トリクロロエチレン等の溶液又は懸濁液と
し、60℃以下の温度下で塩素化反応させたもの
で、塩素含有量15〜40%、軟化点30〜100℃、平
均分子量10万〜100万のものが適当である。塩素
化ポリエチレンは、ポリエチレンそのものよりも
軟らかく、ゴム状を呈し、かつ溶剤に溶解しやす
く、塗膜の耐衝撃性、屈曲性を向上することが出
来る。 該塩素化ポリエチレンの配合割合は、前記エポ
キシ樹脂とエポキシ硬化剤100重量部に対し、10
〜50重量部が適当である。なお、塩素化ポリエチ
レンの配合割合が前記範囲より多過ぎると塗料の
経時安定性が悪くなり、好ましくない。逆に配合
割合が前記範囲より少ないと塗膜の可撓性がなく
なり、脆くなる傾向にあるため同様に好ましくな
い。 本発明の塗料組成物は、以上の塗膜形成成分を
必須成分とするものである。その他塗膜形成成分
として必要により、塗膜硬度、防錆力等をアツプ
させるためリン酸亜鉛、リン酸アルミニウム等の
防錆顔料;タルク、炭酸カルシウム等の体質顔
料;カーボンブラツク等の着色顔料等の顔料を塗
料固形分中30〜50重量%配合するのが望ましく、
またタレ防止剤、レベリング剤等の添加剤を少量
配合するのが望ましい。 本発明の塗料組成物は、以上からなる塗膜形成
成分に、さらにトルエン、キシレン、メチルエチ
ルケトン、ブタノール等の有機溶剤を適当量配合
し、好ましくは塗装粘度フオードカツプ#4で20
〜60秒に調製したものからなるものである。 なお、本発明の塗料組成物は、二液型塗料であ
り、主剤成分中には、前記エポキシ樹脂、塩素化
ポリエチレン樹脂を、また硬化剤成分中には、エ
ポキシ硬化剤を配合したものであり、その他の成
分は、主剤、硬化剤成分中のいずれに配合しても
よい。ただし主剤中に主として配合する。 本発明に於て塗料の製造方法は公知の方法、例
えばロールミル、ペブルミル、ボールミル等で混
練して製造出来るが、特に密閉式のボールミルの
使用が、溶剤の揮散を防ぎうるので望ましい。 尚、鉄管の塗装方法は、従来のタールエポキシ
樹脂系塗料とほぼ同様に行なうことが出来る。す
なわち、下地処理した後、エアレススプレー、エ
アースプレー、刷毛等の手段により乾燥膜厚80μ
以上、好ましくは100〜200μ程度になるように塗
装し、自然乾燥させる。なお、場合により鉄管を
予め60〜90℃に加温したり、あるいは塗装後強制
乾燥させてもよい。 〈発明の効果〉 本発明の鉄管用塗料組成物は、従来広く利用さ
れているタールエポキシ樹脂系塗料と防錆性、耐
水性、耐薬品性において同程度であり、しかしタ
ールエポキシ樹脂系塗料の欠点である塗装時にお
ける作業環境の悪さ、発ガン性物質の塗膜からの
溶出がなく、また夏場における塗膜の変色やクラ
ツクの発生がない。それ故本発明の鉄管用塗料組
成物は出荷前に再塗装(補修)する必要もなく、
さらに冬場においてもハンドリング可能時間が8
時間以内であり、実用的価値大なるものがある。 以下本発明を実施例により、さらに詳細に説明
する。なお、実施例中「部」、「%」は重量基準で
示す。 実施例 1 ビスフエノール型エポキシ樹脂〔「エピコート
#1001」(シエル化学社製商品名);エポキシ当量
475、NV100%〕77部、ギルソナイト110部、脂
肪族系石油樹脂〔「エスコレツツ3102」(エツソ化
学社製商品名):平均分子量約550、NV100%〕
94.3部、塩素化ポリエチレン〔「スーパークロン
BL」(山陽国策パルプ社製商品名):塩素含有量
18%、重量平均分子量20万〕25部、タルク330部、
タレ防止剤14部、キシロール249部、トルオール
45部、メチルエチルケトン40部をポツトミルにて
練合し、主剤成分を作成した。 またポリアミド樹脂溶液(活性水素当量450、
NV65%)600部、イソブタノール100部、トリオ
ール300部をデイスパーにて混合し、硬化剤成分
を作成した。 このようにして得られた主剤成分90部と硬化剤
成分10部を混合し、塗料を調製した。 脱脂、研磨処理した磨軟鋼板(70×150×0.8
mm)に塗料を乾燥膜厚200μにあるように塗布し、
20℃、1週間乾燥させた。 得られた塗料の増粘性、安定性;塗膜の半硬化
性、耐屈曲性、耐衝撃性、密着性、変色性、耐水
性、耐塩水噴霧性、耐力性ソーダ性、耐流酸性、
クラツク性の各種試験をしたところ第1表の通り
であつた。 実施例 2 ビスフエノール型エポキシ樹脂〔「DER661」
(ダウ・ケミカル社製商品名);エポキシ当量475、
NV100%〕113部、ギルソナイト100部、脂肪族
系石油樹脂〔「クイントン1525L」(日本ゼオン社
製商品名);平均分子量1500、NV100%〕89部、
塩素化ポリエチレン「スーパークロンBL」25部、
タルク183部、炭酸カルシウム90部、カーボンブ
ラツク7部、リン酸アルミニウム顔料30部、タレ
防止剤30部、ハシキ防止剤14部、キシロール250
部、トルオール50部、メチルエチルケトン20部を
ポツトミルにて練合し、主剤成分を作成した。ま
たアミンアダクト溶液(活性水素当量336、
NV55%)647部、イソブタノール100部トルオー
ル253部をデイスパーにて混合し、硬化剤成分を
作成てた。 このようにして得られた主剤成分90部と硬化剤
成分10部を混合し、塗料を調製した。 以下実施例1と同様にして磨軟鋼板に塗布、乾
燥させ、各種試験を行なつた。 実施例 3 ビスフエノール型エポキシ樹脂〔「エピコート
#828」(シエル化学社製商品名);エポキシ当量
190、NV100%〕40部、ビスフエノール型エポキ
シ樹脂「エピコート#1001」40部、ギルソナイト
130部、脂肪族系石油樹脂「クイントン1525L」
110部、塩素化ポリエチレン「スーパークロン
BL」25部、キシロール271部をデイスパーにて混
合し、主剤成分を作成した。 またアミンアダクト溶液(活性水素当量221、
NV70%)520部、キシロール160部をデイスパー
にて混合し硬化剤成分を作成した。 このようにして得られた主剤成分90部と硬化剤
成分10部を混合し、塗料を調製した。 以下実施例1と同様にして磨軟鋼板に塗布、乾
燥させ、各種試験を行なつた。 比較例 1 実施例1において塩素化ポリエチレンを除く以
外は同様にして塗料を調製し、磨軟鋼板に塗布、
乾燥させ、各種試験を行なつた。 比較例 2 実施例1において、石油樹脂を除き、その量だ
けギルソナイトを増量させる以外は同様にして塗
料を調製し、磨軟鋼板に塗布、乾燥させ、各種試
験を行なつた。 比較例 3 実施例1において主剤成分として、ギルソナイ
トを230部、キシロールを400部とする以外は同様
の主剤成分を使用し、主剤成分114部と硬化剤成
分10部を混合し塗料を調製した。以下磨軟鋼板に
同様にして塗布、乾燥させ、各種試験を行なつ
た。 比較例 4 実施例2において主剤成分として石油樹脂を
270部、キシロールを278部とする以外は同様の主
剤成分を使用し、主剤成分115部と硬化剤成分10
部を混合し塗料を調製した。以下同様にして磨軟
鋼板に塗布、乾燥させ、各種試験を行なつた。 比較例 5 実施例2において主剤成分として塩素化ポリエ
チレンを100部とする以外は同様の主剤成分を使
用し主剤成分98部と硬化剤成分10部を混合し、塗
料を調製した。以下同様にして磨軟鋼板に塗布、
乾燥させ、各種試験を行なつた。 比較例 6 コールタールピツチ260部、ビスフエノール型
エポキシ樹脂「エピコート#1001」75部、タルク
250部、炭酸カルシウム100部、タレ防止剤18部、
トルオール110部、メチルエチルケトン90部から
なる主剤成分とアミンアダクト溶液(活性水素当
量336、NV55%)140部、イソブタノール100部、
トルオール760部からなる硬化剤成分とを(100:
10)の割合で混合し、従来のタールエポキシ樹脂
塗料を調製した。 以下実施例1と同様にして磨軟鋼板に塗布乾燥
させ、各種試験を行なつた。
<Industrial Application Field> The present invention does not contain carcinogenic substances and does not cause discoloration or
This invention relates to a coating composition for iron pipes for obtaining a coating film that does not easily cause cracks and the like. <Conventional technology> Tar epoxy resin paints, which are inexpensive and have excellent rust prevention, water resistance, and chemical resistance, have been widely used in this type of technical field as paints for iron pipes such as water pipes and gas pipes. It was used. <Problems to be solved by the invention> However, tar, that is, coal tar pitch, contains a polyhex component, which contains carcinogenic substances. Therefore, due to market demand, tar epoxy resin based There was a desire to develop a paint to replace paint. However, since there was no alternative paint that was inexpensive and had excellent film performance, we had no choice but to use tar-epoxy resin paint, even though we knew that it had the drawbacks mentioned above. was the actual situation. In addition, tar epoxy resin paints often turn brown or crack when exposed to strong ultraviolet rays during the drying process of the paint film within one week in the summer. It was necessary to apply an alkyd resin paint or the like again. In view of the current situation, the inventors of the present invention have conducted intensive research to find a product that does not contain carcinogenic substances, is inexpensive, is resistant to discoloration, cracks, etc., and has excellent rust prevention, water resistance, chemical resistance, etc. They discovered a coating composition for iron pipes that can provide a coating film equivalent to that of tar-epoxy resin coatings, and completed the present invention. <Means for Solving the Problems> That is, the present invention comprises: (i) 100 parts by weight of an epoxy resin having an epoxy equivalent of 150 to 1000 and an epoxy curing agent having at least two or more epoxy groups in one molecule; (ii) Gilsonite 50-200 parts by weight (iii) 20-180 parts by weight of petroleum resin with a number average molecular weight of 2000 or less and (iv) chlorinated polyethylene
Contains 10 to 50 parts by weight of film-forming components, and further contains mineral fillers such as extender pigments, rust-preventing pigments, and coloring pigments, and various additives, etc., as necessary.
This invention relates to a coating composition for iron pipes that is dissolved in a suitable organic solvent. In the present invention, the epoxy resin includes:
Epoxy resins conventionally used in tar epoxy resin paints can be used. Moreover, the epoxy equivalent is preferably about 150 to 1000. If the epoxy equivalent is less than about 150, the paint film will remain sticky and have poor drying properties, and if it exceeds about 1000, it will be difficult to dissolve in solvents, and it will be necessary to use a large amount of solvent, resulting in a low paint solid content. Become. In other words, commercially available products include Epicote 828,
834, 836, 1001, DX-255 (trade name manufactured by Ciel Chemical), Araldite GY-260 (trade name manufactured by Ciba Geigy), DER330, 331, 337 (trade name manufactured by Dow Chemical) ), Epicron 800
Bisphenol type epoxy resins such as DEN431 and DEN438 (product names manufactured by Dow Chemical Company); Araldite CT-508 (product names manufactured by Ciba Geigy); Typical examples include polyglycol type epoxy resins such as Epiklon 200 and Epiclon 400 (trade names manufactured by Dainippon Ink & Chemicals Co., Ltd.). As the epoxy resin agent, compounds commonly used as curing agents for epoxy resins can be used. Examples include aliphatic polyamines, modified aliphatic polyamines, polyamide amines, aromatic polyamines, and modified aromatic polyamines. The mixing ratio of epoxy resin and epoxy curing agent is arbitrarily determined depending on the type of both, but usually (active hydrogen equivalent of curing agent / epoxy equivalent of epoxy resin)
When the value of is in the range of 0.5 to 1.0, the original performance of the epoxy resin can be exhibited. Next, "Gilsonite" used in the present invention has a high softening point produced from natural ore veins.
It is a dark brown hydrocarbon compound with low sulfur and gray content. Typical composition is carbon as the main component
75-86%, hydrogen content 8-15%, nitrogen content 1.5-5%,
It contains 1 to 2% oxygen and 4% or less ash, and its properties include an average molecular weight of about 1300 to 1800, a hardness (moh, s scale) of about 2, and a penetration rate (25°C) of about 2.
It has a specific gravity of 1.03-1.06 and a softening point of 130-190°C. In the present invention, gilsonite is mainly used to improve rust prevention. In addition, because of its high softening point and hardness, it does not have the same stickiness as petroleum-based asphalt, and it also contains almost no carcinogenic substances. The mixing ratio of Gilsonite is 100% of the epoxy resin and 100% of the epoxy curing agent.
A suitable amount is 50 to 200 parts by weight. In addition,
If the proportion of gilsonite exceeds the above range, the paint tends to thicken, which necessitates the use of a large amount of organic binder, which lowers the solid content of the paint and makes the paint film brittle. This is not desirable. On the other hand, if the blending ratio is less than the above range, drying properties will deteriorate, which is not preferable. Next, the petroleum resin used in the present invention is an aliphatic petroleum resin in which a conjugated diene of C5 fraction such as cyclopentadiene and 1,3-pentadiene is partially cyclopolymerized; a heavy oil by-product of petroleum naphtha cracking. Aromatic petroleum resin made by polymerizing C 9 fractions such as styrene derivatives and indene; Copolymer petroleum resin made by copolymerizing the C 5 fraction and C 9 fraction; Aromatic petroleum resin made from hydrogen It is a low molecular weight polymer with a number average molecular weight of about 500 to 2000, such as an alicyclic petroleum resin obtained by polymerizing the added resin or dicyclopentadiene. In addition,
If the molecular weight is higher than the above upper limit, the flexibility etc. of the coating film will decrease, which is not preferable. In the present invention, by blending an appropriate amount of petroleum resin into the paint, the poor compatibility between gilsonite and epoxy resin can be overcome, and as a result, it becomes possible to form a paint. Furthermore, when a large amount of gilsonite is used in a paint, the viscosity tends to increase, but by blending the petroleum resin, the viscosity of the paint can be appropriately lowered and the drying properties of the paint film can be improved. The appropriate blending ratio of the petroleum resin is 20 to 180 parts by weight based on 100 parts by weight of the epoxy resin and epoxy curing agent. If the proportion of the petroleum resin exceeds the above range, there will be a drawback that the coating film will have poor flexibility and become brittle. On the other hand, if the blending ratio is less than the above range, the above-mentioned effects cannot be obtained, which is also not preferable. Next, the chlorinated polyethylene used in the present invention is obtained by making polyethylene into a solution or suspension of carbon tetrachloride, chloroform, trichloroethylene, etc., and subjecting it to a chlorination reaction at a temperature of 60°C or less, and the chlorine content is 15%. ~40%, a softening point of 30 to 100°C, and an average molecular weight of 100,000 to 1,000,000 are suitable. Chlorinated polyethylene is softer and rubber-like than polyethylene itself, and is easily soluble in solvents, and can improve the impact resistance and flexibility of the coating film. The blending ratio of the chlorinated polyethylene is 10 parts by weight to 100 parts by weight of the epoxy resin and epoxy curing agent.
~50 parts by weight is suitable. It should be noted that if the blending ratio of chlorinated polyethylene is too much higher than the above range, the stability of the paint over time will deteriorate, which is not preferable. On the other hand, if the blending ratio is less than the above range, the coating film tends to lose its flexibility and become brittle, which is also not preferred. The coating composition of the present invention contains the above-mentioned coating film-forming components as essential components. Other coating film-forming components include rust-preventive pigments such as zinc phosphate and aluminum phosphate to increase coating hardness and anti-corrosion properties; extender pigments such as talc and calcium carbonate; coloring pigments such as carbon black, etc. It is desirable to blend 30 to 50% by weight of the pigment in the solid content of the paint.
It is also desirable to incorporate a small amount of additives such as anti-sagging agents and leveling agents. The coating composition of the present invention further contains an appropriate amount of an organic solvent such as toluene, xylene, methyl ethyl ketone, butanol, etc. to the above coating film forming components, and preferably has a coating viscosity of #4 and a coating viscosity of 20.
~60 seconds. The coating composition of the present invention is a two-component coating, and contains the above-mentioned epoxy resin and chlorinated polyethylene resin in the main component, and an epoxy curing agent in the curing agent component. , and other components may be blended into either the base agent or the curing agent component. However, it is mainly blended into the main ingredient. In the present invention, the coating material can be produced by any known method such as kneading in a roll mill, pebble mill, ball mill, etc., but it is particularly preferable to use a closed ball mill because it can prevent volatilization of the solvent. Incidentally, the method of painting the iron pipe can be carried out in substantially the same manner as the conventional tar epoxy resin paint. That is, after surface treatment, a dry film thickness of 80 μm is applied using airless spray, air spray, brush, etc.
The above coating is preferably applied to a thickness of about 100 to 200μ, and then allowed to air dry. In addition, depending on the case, the iron pipe may be heated to 60 to 90° C. in advance, or may be force-dried after painting. <Effects of the Invention> The coating composition for iron pipes of the present invention has rust prevention, water resistance, and chemical resistance comparable to tar epoxy resin coatings that have been widely used in the past, but is superior to tar epoxy resin coatings. There are no drawbacks such as the poor working environment during painting, no elution of carcinogenic substances from the paint film, and no discoloration or cracking of the paint film in the summer. Therefore, the coating composition for iron pipes of the present invention does not need to be repainted (repaired) before shipping.
Furthermore, even in winter, the handling time is 8.
It takes less than an hour and has great practical value. The present invention will be explained in more detail below using examples. In the examples, "parts" and "%" are expressed on a weight basis. Example 1 Bisphenol type epoxy resin [“Epicote #1001” (trade name manufactured by Ciel Chemical Co., Ltd.); Epoxy equivalent
475, NV100%] 77 parts, Gilsonite 110 parts, aliphatic petroleum resin ["Escolets 3102" (trade name manufactured by Etsuo Chemical Co., Ltd.): average molecular weight approximately 550, NV100%]
94.3 parts, chlorinated polyethylene [“Super Chron”
BL” (product name manufactured by Sanyo Kokusaku Pulp Co., Ltd.): Chlorine content
18%, weight average molecular weight 200,000] 25 parts, talc 330 parts,
Anti-sagging agent 14 parts, xylene 249 parts, toluol
45 parts of methyl ethyl ketone and 40 parts of methyl ethyl ketone were kneaded in a pot mill to prepare a base ingredient. In addition, polyamide resin solution (active hydrogen equivalent 450,
A curing agent component was prepared by mixing 600 parts of NV65%), 100 parts of isobutanol, and 300 parts of triol in a disper. 90 parts of the base component thus obtained and 10 parts of the curing agent component were mixed to prepare a paint. Degreased and polished mild steel plate (70 x 150 x 0.8
mm) to a dry film thickness of 200μ,
It was dried at 20°C for one week. Thickening properties and stability of the resulting paint; semi-curing properties of the coating film, bending resistance, impact resistance, adhesion, discoloration, water resistance, salt spray resistance, soda resistance, flowing acid resistance,
Various crack resistance tests were carried out and the results were as shown in Table 1. Example 2 Bisphenol type epoxy resin [“DER661”]
(Product name manufactured by Dow Chemical Company); Epoxy equivalent: 475,
NV100%] 113 parts, Gilsonite 100 parts, aliphatic petroleum resin ["Quinton 1525L" (trade name manufactured by Zeon Corporation); average molecular weight 1500, NV100%] 89 parts,
25 parts of chlorinated polyethylene "Super Chron BL",
183 parts of talc, 90 parts of calcium carbonate, 7 parts of carbon black, 30 parts of aluminum phosphate pigment, 30 parts of anti-sagging agent, 14 parts of anti-scalding agent, 250 parts of xylol
1, 50 parts of toluene, and 20 parts of methyl ethyl ketone were kneaded in a pot mill to prepare a main ingredient. Also, amine adduct solution (active hydrogen equivalent 336,
A curing agent component was prepared by mixing 647 parts of NV55%), 100 parts of isobutanol, and 253 parts of toluene in a disper. 90 parts of the base component thus obtained and 10 parts of the curing agent component were mixed to prepare a paint. Thereafter, in the same manner as in Example 1, it was applied to a polished mild steel plate, dried, and various tests were conducted. Example 3 Bisphenol type epoxy resin [“Epicote #828” (trade name manufactured by Ciel Chemical Co., Ltd.); Epoxy equivalent
190, NV100%] 40 parts, bisphenol type epoxy resin "Epicote #1001" 40 parts, Gilsonite
130 parts, aliphatic petroleum resin "Quinton 1525L"
110 parts, chlorinated polyethylene "Super Chron"
25 parts of ``BL'' and 271 parts of xylene were mixed in a disper to prepare a main ingredient. Also, amine adduct solution (active hydrogen equivalent 221,
A curing agent component was prepared by mixing 520 parts of NV70%) and 160 parts of xylene in a disper. 90 parts of the base component thus obtained and 10 parts of the curing agent component were mixed to prepare a paint. Thereafter, in the same manner as in Example 1, it was applied to a polished mild steel plate, dried, and various tests were conducted. Comparative Example 1 A paint was prepared in the same manner as in Example 1 except that chlorinated polyethylene was removed, and applied to a polished mild steel plate.
It was dried and various tests were performed. Comparative Example 2 A paint was prepared in the same manner as in Example 1 except that the petroleum resin was omitted and the amount of gilsonite was increased by the same amount, and the paint was applied to a polished mild steel plate, dried, and various tests were conducted. Comparative Example 3 The same base ingredients as in Example 1 were used except that 230 parts of gilsonite and 400 parts of xylene were used as the base ingredients, and 114 parts of the base ingredient and 10 parts of the curing agent were mixed to prepare a paint. The coating was applied to a polished mild steel plate in the same manner, dried, and various tests were conducted. Comparative Example 4 In Example 2, petroleum resin was used as the main component.
270 parts and xylene at 278 parts, the same base ingredients were used, 115 parts of the base ingredient and 10 parts of the curing agent.
A paint was prepared by mixing the two parts. The coating was applied to a polished mild steel plate in the same manner, dried, and various tests were conducted. Comparative Example 5 A coating material was prepared using the same base ingredients as in Example 2 except that 100 parts of chlorinated polyethylene was used as the base ingredient, and 98 parts of the base ingredient and 10 parts of the curing agent were mixed. Apply the following to the polished mild steel plate in the same manner.
It was dried and various tests were performed. Comparative Example 6 260 parts of coal tar pitch, 75 parts of bisphenol type epoxy resin "Epicoat #1001", talc
250 parts, calcium carbonate 100 parts, anti-sagging agent 18 parts,
The main ingredient consists of 110 parts of toluene, 90 parts of methyl ethyl ketone, 140 parts of amine adduct solution (active hydrogen equivalent: 336, NV 55%), 100 parts of isobutanol,
A curing agent component consisting of 760 parts of toluol (100:
10) to prepare a conventional tar epoxy resin paint. Thereafter, it was applied to a polished mild steel plate and dried in the same manner as in Example 1, and various tests were conducted.

【表】【table】

【表】 第1表より明らかな通り本発明の塗料組成物は
優れた塗膜性能を有し、鉄管用として合格するも
のであつた。 一方、塩素化ポリエチレンを含有しない比較例
1は塗膜に可撓性がなく耐屈曲性、耐衝撃性が不
良であつた。逆に塩素化ポリエチレンが過剰の比
較例5は塗料安定性が悪く、分離が生じた。 また石油樹脂を含有しない比較例2は塗料の安
定性が悪く、塗膜性能も不良であつた。逆に石油
樹脂が過剰の比較例4は塗膜に可撓性がなく、耐
屈曲性、耐衝撃性が不良であつた。 またギルソナイト過剰の比較例3は塗料が増粘
し塗装作業性不良であつた。 また従来のタールエポキシ樹脂塗料は発ガン性
物質を含むだけでなく、夏場での曝露試験におい
て塗膜が変色、クラツクが生じた。
[Table] As is clear from Table 1, the coating composition of the present invention had excellent coating film performance and passed the test for use on iron pipes. On the other hand, in Comparative Example 1, which did not contain chlorinated polyethylene, the coating film lacked flexibility and had poor bending resistance and impact resistance. On the other hand, in Comparative Example 5 in which chlorinated polyethylene was used in excess, the coating stability was poor and separation occurred. Furthermore, in Comparative Example 2, which did not contain petroleum resin, the stability of the coating material was poor and the coating film performance was also poor. On the other hand, in Comparative Example 4 in which the petroleum resin was excessive, the coating film lacked flexibility and had poor bending resistance and impact resistance. In addition, in Comparative Example 3 with excess gilsonite, the paint thickened and the coating workability was poor. Furthermore, conventional tar epoxy resin paints not only contain carcinogenic substances, but also caused discoloration and cracks in the paint film during exposure tests in the summer.

Claims (1)

【特許請求の範囲】 1 (i) 1分子中に少くとも2個以上のエポキシ
基を有するエポキシ当量150〜1000のエポキシ
シ樹脂及びエポキシ硬化剤 100重量部 (ii) ギルソナイト 50〜200重量部 (iii) 数平均分子量2000以下の石油樹脂 20〜180重量部 (iv) 塩素化ポリエチレン 10〜50重量部 からなる塗膜形成成分を含む、鉄管用塗料組成
物。
[Scope of Claims] 1 (i) 100 parts by weight of an epoxy resin and epoxy curing agent having an epoxy equivalent of 150 to 1000 and having at least two or more epoxy groups in one molecule (ii) 50 to 200 parts by weight of gilsonite (iii) ) A coating composition for iron pipes, comprising a coating film-forming component consisting of 20 to 180 parts by weight of a petroleum resin having a number average molecular weight of 2000 or less (iv) 10 to 50 parts by weight of chlorinated polyethylene.
JP17961686A 1986-07-30 1986-07-30 Paint composition for iron pipe Granted JPS6335665A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17961686A JPS6335665A (en) 1986-07-30 1986-07-30 Paint composition for iron pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17961686A JPS6335665A (en) 1986-07-30 1986-07-30 Paint composition for iron pipe

Publications (2)

Publication Number Publication Date
JPS6335665A JPS6335665A (en) 1988-02-16
JPH0313268B2 true JPH0313268B2 (en) 1991-02-22

Family

ID=16068867

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17961686A Granted JPS6335665A (en) 1986-07-30 1986-07-30 Paint composition for iron pipe

Country Status (1)

Country Link
JP (1) JPS6335665A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100434488C (en) * 2003-05-08 2008-11-19 同济大学 Steel-structure anti-corrosion coating and preparing mehtod thereof
CN104212299B (en) * 2014-09-19 2016-09-14 江苏海晟涂料有限公司 A kind of corrosion-resistant high-temperature coating and preparation method thereof

Also Published As

Publication number Publication date
JPS6335665A (en) 1988-02-16

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