JPH081864A - High corrosion-resistant coated steel plate with excellent working adhesive properties - Google Patents
High corrosion-resistant coated steel plate with excellent working adhesive propertiesInfo
- Publication number
- JPH081864A JPH081864A JP15965394A JP15965394A JPH081864A JP H081864 A JPH081864 A JP H081864A JP 15965394 A JP15965394 A JP 15965394A JP 15965394 A JP15965394 A JP 15965394A JP H081864 A JPH081864 A JP H081864A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- steel sheet
- layer
- coated steel
- adhesion
- 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.)
- Granted
Links
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- Compositions Of Macromolecular Compounds (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は密着性、耐食性、加工性
に優れた塗装鋼板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated steel sheet having excellent adhesion, corrosion resistance and workability.
【０００２】[0002]
【従来の技術】従来から、鋼板の意匠性、耐食性を向上
させる目的で、各種の有機皮膜が鋼板上に施されてい
る。特に近年は、家電、建材用途で、製品の製造工程省
略を目的として、鋼板を加工したあとに塗装するのに代
えて加工前に鋼板に塗装したプレコート材を使用する比
率が増大している。2. Description of the Related Art Conventionally, various organic coatings have been applied to steel sheets for the purpose of improving the design and corrosion resistance of the steel sheets. Particularly in recent years, in household appliances and building materials, the proportion of using a pre-coat material coated on a steel sheet before processing instead of coating after processing the steel sheet is increasing for the purpose of omitting the manufacturing process of the product.
【０００３】耐食性に対する要求は益々高度化してお
り、こうした高耐食性を確保する方法として、塗装用の
原板に表面処理鋼板を使用したり、塗膜厚を厚くする方
法等が実施されている。The demand for corrosion resistance is becoming more and more advanced, and as a method for ensuring such high corrosion resistance, a method of using a surface-treated steel plate as a base plate for coating, a method of increasing the thickness of a coating film, and the like have been implemented.
【０００４】従来の厚膜型塗装鋼板は、熱硬化性樹脂を
有機溶剤又は水に溶解又は分散し、スプレー法、ロール
コーター法、静電塗装法等々の方法で塗装し、加熱乾燥
を行って製造されている。また、近年は、事前に着色さ
れ、また必要に応じて絵柄が印刷されていることもある
熱可塑性樹脂フィルムをラミネートしたラミネート鋼板
が製造されている。前者の熱硬化性樹脂塗装鋼板は、塗
装樹脂の種類を選択することで、塗膜の硬度、耐汚染
性、耐候性等々の塗膜物性を制御でき、耐食性も良好で
あるが、年々要求が厳しくなる耐食性については不十分
になりつつある。すなわち、耐食性を向上させるために
は有機樹脂の塗膜層を厚くする必要があるが、塗装法で
は１回の塗装で得られる塗膜厚みに限界があり、塗膜層
を厚くするには２回以上の塗装が必要となり、複数回の
塗装を施すことは、製造費用が高くなったり、また、排
出される有機溶剤量、廃ガス量が多くなる等の環境上の
問題があった。また、後者の熱可塑性樹脂フィルムラミ
ネート鋼板では、溶剤を使用せずに厚膜の被覆が可能で
あるが、硬度、耐汚染性、耐候性等の表面特異性が熱硬
化性樹脂塗装鋼板に劣る場合が多く、利用できる用途が
限られることも問題である。The conventional thick film type coated steel sheet is prepared by dissolving or dispersing a thermosetting resin in an organic solvent or water, coating it by a spray method, a roll coater method, an electrostatic coating method, etc., and then heating and drying it. Being manufactured. Further, in recent years, a laminated steel sheet is manufactured by laminating a thermoplastic resin film which is colored in advance and may have a pattern printed thereon as required. For the former thermosetting resin coated steel sheet, by selecting the type of coating resin, it is possible to control the coating film physical properties such as hardness, stain resistance, weather resistance, etc., and corrosion resistance is also good, but there is a yearly demand. Corrosion resistance, which becomes severe, is becoming insufficient. That is, in order to improve the corrosion resistance, it is necessary to thicken the coating layer of the organic resin, but the coating method has a limit to the coating thickness that can be obtained by one coating. It is necessary to apply the coating more than once, and applying the coating a plurality of times causes environmental problems such as an increase in manufacturing cost, an increase in the amount of discharged organic solvent, and an increase in the amount of waste gas. Further, in the latter thermoplastic resin film laminated steel sheet, a thick film can be coated without using a solvent, but surface specificity such as hardness, stain resistance, and weather resistance is inferior to that of a thermosetting resin coated steel sheet. In many cases, the available applications are limited, which is also a problem.
【０００５】また、特願平４−２７３５４７号明細書に
は、新しいタイプの厚膜型塗装鋼板として、下層に熱可
塑性樹脂を有し、その上層には熱硬化性塗料あるいは熱
可塑性塗料を配置した２層構造による塗装鋼板が記載さ
れている。これは、熱可塑性樹脂層で厚膜化することに
より耐食性を確保し、その熱可塑性樹脂層の上に従来型
の熱硬化性塗料を塗装することにより表面特性を確保す
るものである。Further, in Japanese Patent Application No. 4-273547, a new type of thick film type coated steel sheet has a thermoplastic resin in the lower layer and a thermosetting paint or a thermoplastic paint in the upper layer. A coated steel sheet having a two-layer structure is described. This is to secure corrosion resistance by thickening the thermoplastic resin layer and to secure surface characteristics by coating a conventional thermosetting paint on the thermoplastic resin layer.
【０００６】[0006]
【発明が解決しようとする課題】特願平４−２７３５４
７号明細書記載の厚膜型塗装鋼板のうち、熱可塑性樹脂
ラミネート層としてポリエチレンテレフタレート（ＰＥ
Ｔ）層を用いた塗装鋼板は、密着性、加工性、耐食性に
優れている。しかしながら、より厳しい密着性が要求さ
れる用途で評価を行ったところ、密着性が十分でなく、
下地鋼板と熱可塑性樹脂層との間で剥離を生じることが
判った。本発明は、下層にＰＥＴ樹脂ラミネート層を有
し、その上層に熱硬化性塗料あるいは熱可塑性塗料を配
置した塗装鋼板において、前述の密着性の問題を解決し
た表面光沢、硬度、耐食性の良好な塗装鋼板を提供する
ものである。[Problems to be Solved by the Invention] Japanese Patent Application No. 4-27354
Among the thick film type coated steel sheets described in No. 7, polyethylene terephthalate (PE
The coated steel sheet using the T) layer has excellent adhesion, workability, and corrosion resistance. However, when evaluated in applications where more stringent adhesion is required, the adhesion is not sufficient,
It was found that peeling occurred between the base steel sheet and the thermoplastic resin layer. The present invention provides a coated steel sheet having a PET resin laminate layer as a lower layer and a thermosetting paint or a thermoplastic paint as an upper layer, and has good surface gloss, hardness and corrosion resistance that solves the above-mentioned adhesion problem. It is to provide painted steel sheets.
【０００７】[0007]
【課題を解決するための手段】本発明は、鋼板の少なく
とも片面に、第１層として３０〜２００μｍの熱可塑性
樹脂ラミネート層を有し、第２層として１０〜３０μｍ
のエステル系又はアルキド系の熱硬化性塗料の塗膜層を
有する塗装鋼板において、上記熱可塑性樹脂ラミネート
層が、ポリエチレンテレフタレート樹脂に対してポリオ
レフィン樹脂を２０〜３５ｗｔ％混合した樹脂ラミネー
ト層であることを特徴とする加工密着性の極めて優れた
高耐食性塗装鋼板、及び、鋼板の少なくとも片面に、第
１層として３０〜２００μｍの熱可塑性樹脂ラミネート
層を有し、第２層として３０〜１００μｍのビニール系
の熱可塑性塗料の塗膜層を有する塗装鋼板において、上
記熱可塑性樹脂ラミネート層が、ポリエチレンテレフタ
レート樹脂に対してポリオレフィン樹脂を２０〜３５ｗ
ｔ％混合した樹脂ラミネート層であることを特徴とする
加工密着性の極めて優れた高耐食性塗装鋼板である。The present invention has a thermoplastic resin laminate layer having a thickness of 30 to 200 μm as a first layer and a second layer having a thickness of 10 to 30 μm on at least one surface of a steel sheet.
In the coated steel sheet having a coating layer of an ester-based or alkyd-based thermosetting coating, the thermoplastic resin laminate layer is a resin laminate layer in which a polyethylene terephthalate resin is mixed with 20 to 35 wt% of a polyolefin resin. Highly corrosion-resistant coated steel sheet having extremely excellent processing adhesion, and a thermoplastic resin laminate layer of 30 to 200 μm as a first layer and a vinyl layer of 30 to 100 μm as a second layer on at least one surface of the steel sheet. In a coated steel sheet having a coating layer of a thermoplastic thermoplastic paint, the thermoplastic resin laminate layer comprises a polyethylene terephthalate resin and a polyolefin resin in an amount of 20 to 35 w.
It is a highly corrosion-resistant coated steel sheet having extremely excellent working adhesion, which is a resin laminate layer containing t%.
【０００８】[0008]
【作用】鋼板とＰＥＴ樹脂層との密着性をより向上させ
るためには、ＰＥＴ樹脂中に熱可塑性ポリオレフィン樹
脂を混合すれば良好な密着性が確保できる。すなわち、
密着性の評価は加工部位で行われ、これはＰＥＴ樹脂面
に応力が加わった状態である。そこで、ＰＥＴ樹脂中の
応力を緩和する処置を行えば密着性が改善されると考
え、ＰＥＴ樹脂中に熱可塑性ポリオレフィン樹脂を混合
することによって加工応力を緩和し、良好な密着性を確
保して、より密着性が要求される用途においても十分な
性能を発揮できる高耐食性塗装鋼板を発明した。In order to further improve the adhesion between the steel sheet and the PET resin layer, good adhesion can be ensured by mixing the thermoplastic polyolefin resin into the PET resin. That is,
The evaluation of adhesion is performed at the processed portion, which is a state where stress is applied to the PET resin surface. Therefore, it is thought that the adhesion will be improved if a treatment for relaxing the stress in the PET resin is performed, and by mixing the thermoplastic polyolefin resin into the PET resin, the processing stress is relieved to ensure good adhesion. , Has invented a highly corrosion-resistant coated steel sheet capable of exhibiting sufficient performance even in applications requiring more adhesion.
【０００９】以下、本発明の内容を詳細に述べる。The details of the present invention will be described below.
【００１０】まず、本発明では鋼板について特に限定す
るものではないが、塗膜との密着性及び耐食性向上のた
めに表面処理した鋼板を用いるのが好ましい。例えば、
冷延鋼板に燐酸塩処理、クロメート処理を施した鋼板、
又、亜鉛、亜鉛−ニッケル合金めっき等の金属めっきを
施した後、同じく燐酸塩処理、クロメート処理等の処理
を施した鋼板が使用される。特に高耐食性を確保するた
めには、後者の金属めっきを施した表面処理鋼板が望ま
しい。First, although the steel sheet is not particularly limited in the present invention, it is preferable to use a surface-treated steel sheet in order to improve the adhesion to the coating film and the corrosion resistance. For example,
Cold rolled steel sheet with phosphate treatment and chromate treatment,
Further, a steel plate which has been subjected to metal plating such as zinc or zinc-nickel alloy plating and then subjected to treatment such as phosphate treatment and chromate treatment is also used. Particularly, in order to secure high corrosion resistance, the latter surface-treated steel sheet plated with metal is desirable.
【００１１】ＰＥＴ樹脂は、樹脂中に、−ＯＨ基、Ｃ−
Ｏ基等の官能基を有するため、鋼板との密着が可能であ
る。そして、ＰＥＴ樹脂中の非晶質ＰＥＴ樹脂成分を増
加させると密着性はさらに向上する。本発明に使用する
ＰＥＴ樹脂には、一般に使用されるＰＥＴ樹脂をベース
樹脂として使用できる。また、ＰＥＴ樹脂中にポリオレ
フィン樹脂を添加すると耐衝撃性等、内部応力の緩和が
見られることから、ＰＥＴ樹脂中にポリオレフィン樹脂
を添加することが行われている。ポリオレフィンはＰＥ
Ｔ樹脂と物性が異なり、添加量が多くなるとＰＥＴ樹脂
の硬度、フレーバー性といった表面特性等を阻害するた
め、一般に１５％程度の添加に止められている。PET resin contains --OH groups and C--
Since it has a functional group such as an O group, it can be adhered to a steel sheet. Then, if the amorphous PET resin component in the PET resin is increased, the adhesiveness is further improved. The PET resin used in the present invention may be a commonly used PET resin as a base resin. Further, when a polyolefin resin is added to the PET resin, relaxation of internal stress such as impact resistance is observed, so that the polyolefin resin is added to the PET resin. Polyolefin is PE
The physical properties are different from those of the T resin, and when the amount of addition is large, surface properties such as hardness and flavor of the PET resin are hindered, so that the addition is generally limited to about 15%.
【００１２】しかし、本発明においては、塗装鋼板の表
面特性は上層に被覆する塗料で確保するので、ＰＥＴ樹
脂中へのポリオレフィン樹脂の添加を加工時の内部応力
を緩和させる最大域まで行うことができる。ポリオレフ
ィンの添加量が２０ｗｔ％未満では加工部での応力緩和
が十分でないため、密着力が弱くなる。また、３５ｗｔ
％を越えて添加すると、応力緩和は十分であるが、ポリ
オレフィン樹脂と鋼板との密着性が低いため、全体とし
て密着性を低下させる。ＰＥＴ樹脂中へ添加するポリオ
レフィン樹脂としては、前述のように耐衝撃性改善を目
的として使用されているポリオレフィン樹脂が使用でき
る。好ましくは、エチレンと不飽和カルボン酸とが共重
合したアイオノマー樹脂を使用する。アイオノマー樹脂
としては、具体的には、エチレンとアクリル酸、メタク
リル酸などの不飽和モノカルボン酸との共重合体のカル
ボキシル基の一部又は全部がナトリウム、カリウムなど
の金属で中和されたものが好適である。さらに、ＰＥＴ
樹脂中へのポリオレフィン樹脂の混合は、メルトブレン
ドのほうが均一な分散状態となるため、ドライブレンド
より望ましい。However, in the present invention, since the surface characteristics of the coated steel sheet are secured by the coating material coated on the upper layer, the addition of the polyolefin resin into the PET resin can be carried out up to the maximum range where the internal stress during processing is relaxed. it can. If the amount of polyolefin added is less than 20 wt%, the stress relaxation at the processed portion will not be sufficient and the adhesion will be weakened. Also, 35 wt
%, The stress relaxation is sufficient, but the adhesion between the polyolefin resin and the steel sheet is low, so the adhesion is reduced as a whole. As the polyolefin resin added to the PET resin, the polyolefin resin used for the purpose of improving impact resistance as described above can be used. An ionomer resin in which ethylene and an unsaturated carboxylic acid are copolymerized is preferably used. Specific examples of the ionomer resin include those in which some or all of the carboxyl groups of a copolymer of ethylene and an unsaturated monocarboxylic acid such as acrylic acid or methacrylic acid are neutralized with a metal such as sodium or potassium. Is preferred. Furthermore, PET
The blending of the polyolefin resin into the resin is more preferable than the dry blending because the melt blending provides a more uniformly dispersed state.
【００１３】熱硬化性塗料及び熱可塑性塗料には、通常
の塗装鋼板で使用される各種の塗料、即ち、有機溶剤又
は水に溶解、分散した通常の塗料が使用できる。熱硬化
性塗料及び熱可塑性塗料の種類、皮膜の構成並びに皮膜
の膜厚は特に限定するものではなく、従来の塗装鋼板と
同じく、目的に応じた皮膜構成又は膜厚とすればよい。As the thermosetting paint and the thermoplastic paint, various kinds of paints used for ordinary coated steel sheets, that is, ordinary paints dissolved or dispersed in an organic solvent or water can be used. The types of thermosetting paints and thermoplastic paints, the structure of the film, and the film thickness of the film are not particularly limited, and the film structure or film thickness may be set according to the purpose, as in the conventional coated steel sheet.
【００１４】先ず、皮膜の種類であるが、加工性に優れ
た塗膜としたい場合は、塩化ビニールゾル塗料、ポリエ
ステル系塗料を選択すればよい。また、表面の光沢、高
硬度が必要な場合は、アクリル系塗料やメラミン系塗料
を選択すればよい。First, regarding the type of coating, if a coating with excellent workability is desired, vinyl chloride sol coating or polyester coating may be selected. When surface gloss and high hardness are required, acrylic paint or melamine paint may be selected.
【００１５】次に、皮膜の構成についてであるが、前記
塗料を樹脂ラミネート層の上に直接塗装すると、樹脂ラ
ミネート層とその上層の塗料樹脂との間で優れた密着性
が得られないことがある。こうした場合は、樹脂ラミネ
ート層の上に先ず両方の樹脂との密着性に優れた塗料、
例えばエポキシ樹脂系塗料等を塗装し、しかる後に前記
塗料を塗装すればよい。また、非常に高い表面硬度等が
必要な場合は、前記塗料樹脂の上層に紫外線硬化樹脂等
を塗装してもよい。Next, regarding the constitution of the film, when the above paint is directly applied onto the resin laminate layer, it may be impossible to obtain excellent adhesion between the resin laminate layer and the paint resin as the upper layer. is there. In such a case, first a paint with excellent adhesion to both resins on the resin laminate layer,
For example, an epoxy resin-based paint may be applied, and then the above paint may be applied. Further, when a very high surface hardness is required, an ultraviolet curable resin or the like may be coated on the coating resin.
【００１６】樹脂ラミネート層の厚みは３０〜２００μ
ｍとする。厚みが薄くなると耐食性確保のために上層の
塗料層を厚膜にする必要があり、前述の問題がある。ま
た、２００μｍの厚みがあれば耐食性はほぼ飽和状態と
なるため、それ以上厚くすることは経済的でない。ま
た、上層の塗料層の厚みは、硬度、耐汚染性、耐候性と
いった表面特性を確保するために、エステル系、アルキ
ド系では１０〜３０μｍ、ビニール系では３０〜１００
μｍが必要である。The thickness of the resin laminate layer is 30 to 200 μm.
m. When the thickness is reduced, the upper coating layer needs to be thick in order to secure the corrosion resistance, which causes the above-mentioned problem. If the thickness is 200 μm, the corrosion resistance is almost saturated, and it is not economical to increase the thickness. The thickness of the upper paint layer is 10 to 30 μm for ester type and alkyd type, and 30 to 100 for vinyl type in order to secure surface characteristics such as hardness, stain resistance and weather resistance.
μm is required.
【００１７】以上のように、本発明の塗装鋼板は、塗装
鋼板に要求される各種品質特性を樹脂ラミネート層と塗
料層とで機能を分担して確保する。すなわち、樹脂ラミ
ネート層は主に耐食性、密着性、塗料層は硬度、色調、
耐候性、及び意匠性等の表面品質を確保するものであ
り、樹脂ラミネート層と鋼板との密着性をより向上さ
せ、強い密着性が要求される用途についても良好な密着
性を有する塗装鋼板である。As described above, in the coated steel sheet of the present invention, various quality characteristics required for the coated steel sheet are ensured by the functions of the resin laminate layer and the coating layer. That is, the resin laminate layer mainly has corrosion resistance, adhesion, and the paint layer has hardness, color tone,
It is a coated steel sheet that secures surface quality such as weather resistance and designability, further improves the adhesion between the resin laminate layer and the steel sheet, and has good adhesion even in applications where strong adhesion is required. is there.
【００１８】[0018]
【実施例１】０．６ｍｍの低炭素冷延鋼板に亜鉛めっき
（２０ｇ／ｍ2 ）し、その上層にクロメート処理した電
気亜鉛めっき鋼板を原板として使用した。この電気亜鉛
めっき鋼板を２００℃に加熱したあと、鋼板の片面にポ
リオレフィン（商品名；ハイミラン、三井デュポンポリ
ケミカル社製）が添加されたＰＥＴ樹脂をエクストリュ
ージョン法で３０、６０、１００μｍの厚みにラミネー
トした。次に、ロールコーター法によりエポキシ系塗料
を５μｍ塗装し、２３０℃×１分で焼き付けた後に、同
じくロールコーター法で市販のポリエステル系樹脂塗料
を２０μｍ塗装し、２３０℃×２分で焼き付け条件で乾
燥硬化させた。このようにして製造した塗装鋼板の加工
密着性、耐食性について調査し、その結果を表１に示
す。Example 1 A 0.6 mm low carbon cold-rolled steel sheet was galvanized (20 g / m 2 ) and a chromate-treated electrogalvanized steel sheet was used as the upper layer as a base sheet. After heating this electrogalvanized steel sheet to 200 ° C., a PET resin containing polyolefin (trade name; Himilan, manufactured by Mitsui DuPont Polychemical Co., Ltd.) added to one side of the steel sheet has a thickness of 30, 60, 100 μm by an extrusion method. Laminated to. Next, after applying an epoxy-based paint to a thickness of 5 μm by a roll coater method and baking at 230 ° C. for 1 minute, a commercially available polyester-based resin paint is also applied at a thickness of 20 μm by a roll coater method and baking at 230 ° C. for 2 minutes. It was dried and cured. The work adhesion and corrosion resistance of the coated steel sheet thus manufactured were investigated, and the results are shown in Table 1.
【００１９】[0019]
【表１】 [Table 1]
【００２０】＊１）加工密着性１：塗装鋼板を１８０°
折り曲げ加工し、折り曲げ部の亀裂を２０倍ルーペで観
察する。 ◎；塗膜の亀裂が認められない、 ○；微細な亀裂が認められる、 △；塗膜の亀裂が認められる。* 1) Processing adhesion 1: 180 ° for coated steel sheet
Bending is performed, and cracks in the bent portion are observed with a 20 times magnifying glass. ⊚: No cracks are found in the coating film, ◯: Fine cracks are found, Δ: Cracks in the coating film are found.
【００２１】＊２）加工密着性２：塗装鋼板を沸騰水中
に２時間浸潰し、２ｍｍ角碁盤目を入れたのち、６．５
ｍのエリクセン押し出し加工を行う。そのあとエリクセ
ン部の皮膜をテープ剥離し、１００枡目のうち幾つ皮膜
（鋼板とＰＥＴ樹脂層間）が残っているかを調査する。* 2) Working adhesion 2: The coated steel sheet is immersed in boiling water for 2 hours, and a 2 mm square grid is placed on it.
m Erichsen extrusion processing is performed. After that, the film on the Erichsen part is peeled off with a tape, and it is investigated how many films (the steel plate and the PET resin layer) remain in 100 squares.
【００２２】＊３）耐食性：塗装鋼板を１８０°折り曲
げ加工し、その試験片の塩水噴霧試験を行う。４０００
時間の塩水噴霧を行ったあとの錆発生状況で評価する。 ◎；錆発生が全く認められない、 ○；僅かに白錆（亜鉛の腐食生成物）が認められる、 △；白錆のほか赤錆が認められる、 ×；加工部の５０％以上に赤錆発生。* 3) Corrosion resistance: A coated steel sheet is bent by 180 °, and a salt spray test is conducted on the test piece. 4000
Evaluate the rust occurrence after the salt spray for a period of time. ⊚: No rust generated at all, ∘: Slight white rust (corrosion product of zinc) found, Δ: Red rust found in addition to white rust, ×: Red rust generated in 50% or more of the processed part.
【００２３】実施例〜は良好な密着性を有してお
り、長期間の耐食性評価においても良好な耐食性を有し
ていることが判る。一方、ポリオレフィン樹脂添加量が
従来の添加量である比較例及びポリオレフィン樹脂添
加量が多すぎる比較例は密着性が悪く、耐食性評価に
おいても錆の発生が見られることが判る。It is understood that Examples 1 to 3 have good adhesion, and also have good corrosion resistance in long-term corrosion resistance evaluation. On the other hand, it can be seen that the comparative example in which the amount of the polyolefin resin added is the conventional amount and the comparative example in which the amount of the polyolefin resin added is too large have poor adhesion, and rust is also observed in the corrosion resistance evaluation.
【００２４】[0024]
【実施例２】０．６ｍｍの低炭素冷延鋼板に亜鉛めっき
（２０ｇ／ｍ2 ）し、その上層にクロメート処理した電
気亜鉛めっき鋼板を原板として使用した。この電気亜鉛
めっき鋼板を２００℃に加熱したあと、鋼板の片面にポ
リオレフィン（商品名；ハイミラン、三井デュポンポリ
ケミカル社製）が添加されたＰＥＴ樹脂をエクストリュ
ージョン法で３０、６０、１００μｍの厚みにラミネー
トした。次に、ロールコーター法によりエポキシ系塗料
を５μｍ塗装し、２３０℃×１分で乾燥焼き付けた後
に、同じくロールコーター法で市販の塩化ビニール系樹
脂塗料を５０μｍ塗装し、２３０℃×２分で焼き付け硬
化させた。このようにして製造した塗装鋼板の加工密着
性、耐食性について調査し、その結果を表２に示す。Example 2 A 0.6 mm low carbon cold-rolled steel sheet was galvanized (20 g / m 2 ) and a chromate-treated electrogalvanized steel sheet was used as the upper layer as a base sheet. After heating this electrogalvanized steel sheet to 200 ° C., a PET resin containing polyolefin (trade name; Himilan, manufactured by Mitsui DuPont Polychemical Co., Ltd.) added to one side of the steel sheet has a thickness of 30, 60, 100 μm by an extrusion method. Laminated to. Next, after applying an epoxy-based paint to a thickness of 5 μm by the roll coater method and drying and baking at 230 ° C. for 1 minute, a commercially available vinyl chloride resin paint is also applied at a thickness of 50 μm by the roll coater method and baking at 230 ° C. for 2 minutes. Cured. The work adhesion and corrosion resistance of the coated steel sheet thus manufactured were investigated, and the results are shown in Table 2.
【００２５】[0025]
【表２】 [Table 2]
【００２６】実施例〜は良好な密着性を有してお
り、長期間の耐食性評価においても良好な耐食性を有し
ていることが判る。一方、ポリオレフィン樹脂添加量が
従来の添加量である比較例及びポリオレフィン樹脂添
加量が多すぎる比較例は密着性が悪く、耐食性評価に
おいても錆の発生が見られることが判る。It is understood that Examples 1 to 3 have good adhesion, and also have good corrosion resistance in long-term corrosion resistance evaluation. On the other hand, it can be seen that the comparative example in which the amount of the polyolefin resin added is the conventional amount and the comparative example in which the amount of the polyolefin resin added is too large have poor adhesion, and rust is also observed in the corrosion resistance evaluation.
【００２７】[0027]
【発明の効果】本発明により、強い密着性、高耐食性が
要求される用途への塗装鋼板の提供が可能になり、本発
明の高耐食性塗装鋼板は、家電、建材等々の多くの用途
で極めて高耐食性が要求されるものに使用できる。ま
た、本発明の高耐食性塗装鋼板は、厚膜型塗装鋼板にも
かかわらずその大部分が熱可塑性樹脂であり、塗装に伴
う有機溶剤の使用を減少させることができる。EFFECTS OF THE INVENTION The present invention makes it possible to provide a coated steel sheet for applications requiring strong adhesion and high corrosion resistance. The highly corrosion-resistant coated steel sheet of the present invention is extremely useful in many applications such as home appliances and building materials. It can be used for products that require high corrosion resistance. Further, the high corrosion-resistant coated steel sheet of the present invention is mostly a thermoplastic resin despite the thick film type coated steel sheet, so that it is possible to reduce the use of the organic solvent accompanying the coating.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０９Ｄ 167/00 ＰＬＡ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication C09D 167/00 PLA
Claims (2)
３０〜２００μｍの熱可塑性樹脂ラミネート層を有し、
第２層として１０〜３０μｍのエステル系又はアルキド
系の熱硬化性塗料の塗膜層を有する塗装鋼板において、
上記熱可塑性樹脂ラミネート層が、ポリエチレンテレフ
タレート樹脂に対してポリオレフィン樹脂を２０〜３５
ｗｔ％混合した樹脂ラミネート層であることを特徴とす
る加工密着性の極めて優れた高耐食性塗装鋼板。1. A thermoplastic resin laminate layer having a thickness of 30 to 200 μm as a first layer on at least one surface of a steel plate,
A coated steel sheet having a coating layer of an ester-based or alkyd-based thermosetting coating of 10 to 30 μm as the second layer,
The thermoplastic resin laminate layer comprises a polyethylene terephthalate resin and a polyolefin resin of 20 to 35.
A highly corrosion-resistant coated steel sheet with extremely excellent processing adhesion, which is a resin laminate layer mixed in wt%.
３０〜２００μｍの熱可塑性樹脂ラミネート層を有し、
第２層として３０〜１００μｍのビニール系の熱可塑性
塗料の塗膜層を有する塗装鋼板において、上記熱可塑性
樹脂ラミネート層が、ポリエチレンテレフタレート樹脂
に対してポリオレフィン樹脂を２０〜３５ｗｔ％混合し
た樹脂ラミネート層であることを特徴とする加工密着性
の極めて優れた高耐食性塗装鋼板。2. A thermoplastic resin laminate layer having a thickness of 30 to 200 μm as a first layer on at least one surface of a steel plate,
In a coated steel sheet having a coating layer of 30-100 μm vinyl-based thermoplastic paint as the second layer, the thermoplastic resin laminate layer is a resin laminate layer in which a polyethylene terephthalate resin is mixed with 20 to 35 wt% of a polyolefin resin. Highly corrosion-resistant coated steel sheet with excellent work adhesion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15965394A JP3294943B2 (en) | 1994-06-20 | 1994-06-20 | High corrosion resistance coated steel sheet with extremely excellent work adhesion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15965394A JP3294943B2 (en) | 1994-06-20 | 1994-06-20 | High corrosion resistance coated steel sheet with extremely excellent work adhesion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH081864A true JPH081864A (en) | 1996-01-09 |
| JP3294943B2 JP3294943B2 (en) | 2002-06-24 |
Family
ID=15698416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15965394A Expired - Fee Related JP3294943B2 (en) | 1994-06-20 | 1994-06-20 | High corrosion resistance coated steel sheet with extremely excellent work adhesion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3294943B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999027026A1 (en) * | 1997-11-26 | 1999-06-03 | Nippon Steel Corporation | Coating resin composition for metal sheets, and resin films, resin-coated metal sheets and resin-coated metal vessels each made by using the composition |
| WO2002076729A1 (en) * | 2001-03-21 | 2002-10-03 | Toyo Kohan Co., Ltd. | Metal sheet coated with thermoplastic resin and can obtained therefrom |
-
1994
- 1994-06-20 JP JP15965394A patent/JP3294943B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999027026A1 (en) * | 1997-11-26 | 1999-06-03 | Nippon Steel Corporation | Coating resin composition for metal sheets, and resin films, resin-coated metal sheets and resin-coated metal vessels each made by using the composition |
| EP1035182A1 (en) * | 1997-11-26 | 2000-09-13 | Nippon Steel Corporation | Coating resin composition for metal sheets, and resin films, resin-coated metal sheets and resin-coated metal vessels each made by using the composition |
| EP1035182A4 (en) * | 1997-11-26 | 2002-04-24 | Nippon Steel Corp | Coating resin composition for metal sheets, and resin films, resin-coated metal sheets and resin-coated metal vessels each made by using the composition |
| US6783825B1 (en) | 1997-11-26 | 2004-08-31 | Nippon Steel Corporation | Resin-metal laminates |
| EP1496092A1 (en) * | 1997-11-26 | 2005-01-12 | Nippon Steel Corporation | Resin composition for metal sheet coating, resin film employing it, resin-coated metal sheet and resin-coated metal container |
| US7312276B2 (en) | 1997-11-26 | 2007-12-25 | Nippon Steel Corporation | Resin composition for metal sheet coating, resin film employing it, resin-coated metal sheet and resin-coated metal container |
| WO2002076729A1 (en) * | 2001-03-21 | 2002-10-03 | Toyo Kohan Co., Ltd. | Metal sheet coated with thermoplastic resin and can obtained therefrom |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3294943B2 (en) | 2002-06-24 |
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