JPS6328935B2 - - Google Patents
Info
- Publication number
- JPS6328935B2 JPS6328935B2 JP58201073A JP20107383A JPS6328935B2 JP S6328935 B2 JPS6328935 B2 JP S6328935B2 JP 58201073 A JP58201073 A JP 58201073A JP 20107383 A JP20107383 A JP 20107383A JP S6328935 B2 JPS6328935 B2 JP S6328935B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- coating composition
- primary hydroxyl
- present
- coating
- 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
Links
- 239000008199 coating composition Substances 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000000049 pigment Substances 0.000 claims description 13
- 239000003822 epoxy resin Substances 0.000 claims description 8
- 229920000647 polyepoxide Polymers 0.000 claims description 8
- 229920000098 polyolefin Polymers 0.000 claims description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 7
- 229920002050 silicone resin Polymers 0.000 claims description 7
- -1 isocyanate compound Chemical class 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 6
- 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 claims description 4
- 239000012948 isocyanate Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 2
- 125000001931 aliphatic group Chemical group 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims description 2
- 150000002513 isocyanates Chemical class 0.000 claims description 2
- 229920001228 polyisocyanate Polymers 0.000 claims description 2
- 239000005056 polyisocyanate Substances 0.000 claims description 2
- 239000003223 protective agent Substances 0.000 claims description 2
- 125000000467 secondary amino group Chemical class [H]N([*:1])[*:2] 0.000 claims description 2
- NVKTUNLPFJHLCG-UHFFFAOYSA-N strontium chromate Chemical compound [Sr+2].[O-][Cr]([O-])(=O)=O NVKTUNLPFJHLCG-UHFFFAOYSA-N 0.000 claims description 2
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims 1
- 239000003973 paint Substances 0.000 description 15
- 238000000576 coating method Methods 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 10
- 239000010408 film Substances 0.000 description 8
- 239000000314 lubricant Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000003449 preventive effect Effects 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920001225 polyester resin Polymers 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000377 silicon dioxide Chemical group 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 150000001343 alkyl silanes Chemical class 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- BCFSVSISUGYRMF-UHFFFAOYSA-N calcium;dioxido(dioxo)chromium;dihydrate Chemical compound O.O.[Ca+2].[O-][Cr]([O-])(=O)=O BCFSVSISUGYRMF-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Polyurethanes Or Polyureas (AREA)
- Paints Or Removers (AREA)
Description
技術分野
本発明は防錆プレコート鋼板用塗料組成物に関
し、更に詳しくはウレタン変性エポキシ樹脂組成
物、防錆顔料及び潤滑剤を含む、プレス加工性、
特に型カジリ性、塗り重ね及び耐食性に優れるプ
レコート鋼板用塗料組成物に関する。
従来技術
塗料を予め塗装したプレコート用鋼板は家電製
品、什器類用として多用されていることは良く知
られている通りである。この様なプレコート鋼板
用の塗料としては公知のアクリル樹脂、ポリエス
テル樹脂、塩ビ樹脂系の塗料があり、又塗装機と
してはロールコーター、カーテンフローコーター
等を用い、塗装方式としては１コート１ベーク或
いは２コート２ベーク、又は２コート１ベーク等
の塗装方式により仕上げられている。
この様にして製造された鋼板は使用に際してロ
ール成型、プレス加工、折り曲げ加工により加工
されるため、加工性に優れていることが要求さ
れ、更に製品としての要求性能、即ち耐食性、耐
湿性、耐水性、耐汚染性、耐薬品性、耐油性等の
耐久性が要求される。
これらの性能を満足するには上塗のみの１コー
ト１ベーク方式の塗装では不十分であり、特に高
度な加工性及び耐食性を満足させるためには防錆
塗料を含む系を用いることが必要となる。
防錆塗料としては通常６〜10％程度のクロメー
ト系顔料を含む高分子エボキシ樹脂塗料が使用さ
れているが、この樹脂系塗料をプレコート鋼板用
として用いた場合には、プレス加工における型カ
ジリ性及び耐食性が不十分であり、このままでは
使用に堪えない。また、上記性能を満足する系と
して、例えば亜鉛末を多量に含む系による高耐食
性、フツ素樹脂を上塗りとする系による高耐候
性、オイルフリーポリエステル樹脂、塩化ビニル
樹脂系等による高加工性等の確保が可能となる塗
料も存在するが、型カジリ性、塗り重ね性等を含
めた総合性能が希望の水準に達している系は存在
しない。
発明の目的
従つて、本発明の目的は前記した従来技術の欠
点を排除し、前記性能の中でプレス加工性、特に
型カジリ性、本発明の塗料組成物の塗膜の上へ他
の塗料を積層する場合の塗り重ね性及び本発明の
塗料組成物自体の耐食性を改良することにある。
発明の構成
本発明に従えば、
() (イ)ビスフエノールＡ型エポキシ樹脂（a1）
と脂肪族二塩基酸（a2）と第１級ヒドロキシル
基を持つ第２級アミン（a3）とを反応させてな
る末端に第１級ヒドロキシル基を持つプレポリ
マー(A)と(ロ)ポリイソシアネート化合物（b1）と
イソシアネート保護剤（b2）を反応させてなる
部分保護イソシアネート化合物(B)とを（Ａに含
まれる第１級ヒドロキシル基の数）／（Ｂに含
まれる遊離のイソシアネート基の数）の比が
10／１〜１／１となるように反応させてなるウ
レタン変性エポキシ樹脂組成物40〜70重量％、
() 水可溶分が１重量％以下の防錆顔料 15〜
25重量％
() ポリオレフインワツクス １〜10重量％、
() 二硫化モリブデン 0.5〜５重量％及び
() シリコーン樹脂 0.05〜１重量％
を含んでなることを特徴とするプレコート鋼板用
塗料組成物が提供される。
発明の構成及び作用効果の具体的説明
この明細書において、「型カジリ性」とはプレ
コート鋼板のプルス加工時に、加工の程度が大き
な場合に大きく伸びるべき部分の塗膜が型に接触
してひつかき傷が発生したり、或いは塗膜破壊に
より変色したりするような現象を起しやすいか否
かの性質をいい、又「塗り重ね性」とは、本発明
の塗料組成物の塗膜（これ自体で通常の要求性能
は十分に満足するが加工後等の一部又は全面の模
様ずりのためや耐食性及び耐候性等を格段に向上
せしめるため）の上に、更に異種の塗料を上塗り
する際の密着性が良好か否かを示す性質をいう。
なお、このような目的で使用される上塗塗料とし
てはポリエステル樹脂、アクリル樹脂、ウレタン
樹脂、硝化綿ラツカー系等の塗料があげられる。
本発明の塗料組成物において使用されるウレタ
ン変性エポキシ樹脂組成分としては例えば、特開
昭57−30717号公報の実施例１〜６に開示されて
いる熱硬化性樹脂溶液があげられ、その配合量は
塗料組成物の40〜70重量％の範囲にあれば良い。
この配合量が40重量％未満では十分な型カジリ性
と加工性が得られず、逆に70重量％を超えると耐
キズつき性（耐スクラツチ性）、耐食性を阻害す
るので好ましくない。
本発明の塗料組成物において使用される水可溶
分が１重量％以下の防錆顔料としてはカルシウム
クロメート、ストロンチウムクロメート等のクロ
メート顔料とアルミニウムトリポリリン酸を亜鉛
やシリカで変性したものからなる複合リン酸アル
ミニウムが好適である。加工性等の性能の改良を
目的とした本発明のプレコート鋼板は１〜8μm程
度の薄膜仕上げにする必要があり（通常のプレコ
ート鋼板は10〜20μm仕上げ）、これらの防錆顔料
はこの点からも他の防錆顔料に代替不可能であ
る。防錆顔料の水可溶分が１重量％を超えると高
湿度下の腐食環境で水分を吸収してフクレ等が発
生しやすくなるため好ましくない。防錆顔料の配
合量が５重量％未満では防錆効果が得られないの
で好ましくなく、逆に25重量％を超えても防錆力
のそれ以上の向上があまり認められず逆に加工性
等が低下する傾向にあるので好ましくない。
本発明に従えば、更に本発明の重要な成分とし
てポリオレフインワツクス、二硫化モリブデン及
びシリコーン樹脂を潤滑剤として配合する。潤滑
剤の配合は、本発明の塗料組成物を適用した素材
をプルス加工するに際し、塗装面の型カジリ性及
び耐白化剥離性を向上する上で特に重要である。
一方塗膜に潤滑剤を添加すると一般には塗り重ね
性が低下するので、型カジリ性及び耐白化剥離性
と塗り重ね性の両性能をバランスさせることが重
要な課題である。
本発明の塗料組成物には、潤滑剤として、ポリ
オレフインワツクス、好ましくは分子量が1500〜
3000程度のポリエチレン、ポリプロピレン等の低
分子ポリオレフイン１〜10重量％と、二硫化モリ
ブデン、好ましくは粒径が10μ以下で純度99.8％
以上の二硫化モリブデン0.5〜５重量％及びシリ
コーン樹脂、好ましくはポリアルキル基を有する
ポリオキシアルキルシラン等に代表されるアルキ
ルシラン等の特殊なシリコーン樹脂0.05〜１重量
％が用いられる。この場合、塗膜に潤滑性を付与
するだけであるならグラフアイト、シリコーンオ
イル等が用いてもよいが、グラフアイトは黒色で
あるため任意の色相を得ることができず、またシ
リコーンオイルは滑性がありすぎるため、上塗塗
料を塗り重ねると剥離を生じ又塗料ハジキ等を起
すので本発明に用いる事は適切でない。
前記ポリオレフインワツクスの配合量が１重量
％に達しないと潤滑効果がなく逆に10重量％を超
えると表面光沢、ブロツキング性、塗り重ね性等
が悪くなるので好ましくなく、特に好ましい範囲
は４〜８重量％である。
前記二硫化モリブデンの配合量が0.3重量％に
達しないと潤滑効果がなく、逆に５重量％を超え
ると耐食性が低下するので好ましくない。特に好
ましい配合量は0.5〜3.0重量％である。
前記シリコーン樹脂の配合量が0.05重量％に達
しないと潤滑効果がなく、逆に１重量％を超える
と塗り重ね性が大巾に低くするので好ましくな
い。特に好ましい範囲は0.2〜0.5重量％である。
また上記３種類の潤滑剤の配合量としては３〜
10重量％であるのが好ましく、特に好ましくは４
〜８重量％である。
本発明に係わる塗料組成物には、上記必須成分
の他に、必要に応じて、例えば酸化チタン、弁
柄、シヤニンブルー、カーボンブラツク等の着色
顔料クレー、硫酸バリウム、炭酸カルシウム、シ
リカ等の体質顔料等を併用することができ、更に
その他の慣用配合成分を配合することもできる。
本発明の塗料組成物は通常のロールミル、サン
ドグラインドミル等によつて混合分散して製造す
ることができるが、ポリオレフインワツクス、シ
リコーン樹脂は分散時或いは塗料の使用時に添加
混合してもよい。
本発明に従えば、前述のようなウレタン変性エ
ポキシ樹脂組成物と水可溶分１重量％以下の防錆
顔料並びに特定の３種類の潤滑剤を組み合せて塗
料組成物に配合することにより、従来達成できな
かつたプルス加工時の型カジリ性を改良すること
ができ、更には塗り重ね性、耐食性、耐久性等の
性能をも同等水準以上に維持することができる。
本発明の塗料組成物を適用する素材としては、
亜鉛めつき鋼板、亜鉛系めつき鋼板、アルミめつ
き鋼板、ステンレス板等である。これらの素材
は、必要に応じて、表面処理を施しその上にカー
テンフローコーター、ロールコーター等で乾燥塗
膜厚１〜8μm程度の厚さ塗布し、塗装後は、素材
温度で200〜240℃の範囲で乾燥させる。乾燥方式
としては、例えば熱風炉、赤外線炉等を適用する
ことができる。
実施例
以下、実施例に基づいて本発明を更に具体的に
説明するが、これらは本発明の範囲を限定するも
のでないことはいうまでもない。なお、以下実施
例において「部」は重量部を意味する。
実施例１〜９及び比較例１〜３
第１表及び第２表に示した、キシロール以外の
原料を同時に添加混合し、サンドグラインドミル
にて最大粒径15μmとなるように分散させ、次に
キシロールを配合して、実施例１〜９及び比較例
１〜３の塗料組成物を製造した。
次にこれらの塗料組成物をクロメート処理した
0.05mm厚電気亜鉛めつき板（目付量30g／m2）に
乾燥塗膜厚1.5〜2.0μmとなるようにバーコーター
で塗布し、直ちに熱風炉にて45秒で最高到達板温
が200℃になるように焼付け、試験片を得た。
この試験片について加工性、耐SST性、耐型
カジリ性及び塗り重ね性を試験した。結果を第１
表及び第２表に示す。
TECHNICAL FIELD The present invention relates to a coating composition for rust-preventing pre-coated steel sheets, and more specifically, it includes a urethane-modified epoxy resin composition, a rust-preventing pigment, and a lubricant, which has good press workability,
In particular, the present invention relates to a coating composition for pre-coated steel sheets that is excellent in mold galling properties, recoating properties, and corrosion resistance. PRIOR ART It is well known that pre-coated steel sheets, which are pre-coated with paint, are widely used for home appliances and fixtures. Paints for such pre-coated steel sheets include well-known acrylic resin, polyester resin, and vinyl chloride resin paints, and roll coaters, curtain flow coaters, etc. are used as coating machines, and coating methods include one-coat, one-bake, or It is finished using a coating method such as 2 coats 2 bakes or 2 coats 1 bake. Steel sheets manufactured in this way are processed by roll forming, press working, and bending when used, so they are required to have excellent workability, and also meet the required performance as a product, namely corrosion resistance, moisture resistance, and water resistance. Durability such as durability, stain resistance, chemical resistance, and oil resistance is required. To satisfy these performance requirements, a one-coat, one-bake coating with only a top coat is insufficient, and in order to satisfy particularly high workability and corrosion resistance, it is necessary to use a system that includes anti-corrosion paint. . Polymer epoxy resin paints containing about 6 to 10% chromate pigments are usually used as anti-corrosion paints, but when this resin paint is used for pre-coated steel sheets, mold galling during press working is a problem. and its corrosion resistance is insufficient, making it unusable as it is. In addition, examples of systems that satisfy the above performance include, for example, high corrosion resistance due to a system containing a large amount of zinc dust, high weather resistance due to a system using a fluororesin topcoat, and high workability due to an oil-free polyester resin, vinyl chloride resin, etc. Although there are paints that can ensure this, there is no system that achieves the desired level of overall performance, including mold locking properties, recoatability, etc. OBJECTS OF THE INVENTION Therefore, the object of the present invention is to eliminate the drawbacks of the prior art described above, and among the above-mentioned properties, to improve press workability, especially mold smearability, and to improve the ability of other paints to coat the coating film of the coating composition of the present invention. The object of the present invention is to improve the recoatability when laminating layers and the corrosion resistance of the coating composition itself. Structure of the Invention According to the present invention, () (a) Bisphenol A type epoxy resin (a 1 )
A prepolymer (A) having a primary hydroxyl group at the end obtained by reacting an aliphatic dibasic acid (a 2 ) with a secondary amine (a 3 ) having a primary hydroxyl group and (b) A partially protected isocyanate compound (B) obtained by reacting a polyisocyanate compound (b 1 ) with an isocyanate protecting agent (b 2 ) is prepared by (number of primary hydroxyl groups contained in A)/(free number of hydroxyl groups contained in B). The ratio of the number of isocyanate groups is
40 to 70% by weight of a urethane-modified epoxy resin composition reacted to give a ratio of 10/1 to 1/1, () Rust preventive pigment with a water-soluble content of 1% by weight or less 15 to
A coating composition for a precoated steel sheet, comprising: 25% by weight () 1-10% by weight of polyolefin wax, () 0.5-5% by weight of molybdenum disulfide, and () 0.05-1% by weight of silicone resin. provided. Detailed explanation of the structure, function, and effect of the invention In this specification, "mold galling property" means that during pull processing of a pre-coated steel sheet, the coating film in the part that should expand greatly when the degree of processing is large comes into contact with the mold and remains in place. It refers to the property of easily causing scratches or discoloration due to paint film destruction, and "recoatability" refers to the property of the paint film of the coating composition of the present invention ( Although this alone sufficiently satisfies the normal performance requirements, a different type of paint is applied over the top (to prevent pattern distortion on part or the entire surface after processing, or to significantly improve corrosion resistance, weather resistance, etc.). A property that indicates whether the adhesion is good or not.
The top coating used for this purpose includes polyester resin, acrylic resin, urethane resin, nitrified cotton lacquer paint, and the like. Examples of the urethane-modified epoxy resin composition used in the coating composition of the present invention include thermosetting resin solutions disclosed in Examples 1 to 6 of JP-A No. 57-30717; The amount may be in the range of 40 to 70% by weight of the coating composition.
If the amount is less than 40% by weight, sufficient mold fixing properties and processability cannot be obtained, and if it exceeds 70% by weight, scratch resistance and corrosion resistance are impaired, which is not preferable. The anticorrosion pigment with a water-soluble content of 1% by weight or less used in the coating composition of the present invention is a composite phosphorus compound consisting of a chromate pigment such as calcium chromate or strontium chromate, and aluminum tripolyphosphate modified with zinc or silica. Aluminum acids are preferred. The pre-painted steel sheet of the present invention, which aims to improve performance such as workability, needs to be finished with a thin film of about 1 to 8 μm (normal pre-painted steel sheets are finished with a thickness of 10 to 20 μm), and these anti-rust pigments are used from this point of view. It cannot be replaced with other anti-rust pigments either. If the water-soluble content of the rust-preventing pigment exceeds 1% by weight, it is undesirable because it absorbs moisture in a corrosive environment under high humidity and tends to cause blisters. If the amount of the rust preventive pigment is less than 5% by weight, no rust preventive effect will be obtained, which is undesirable.On the other hand, if it exceeds 25% by weight, no further improvement in the rust preventive power will be observed, and conversely, the processability etc. This is not preferable because it tends to decrease. According to the present invention, polyolefin wax, molybdenum disulfide and silicone resin are further blended as lubricants as important components of the present invention. The blending of the lubricant is particularly important in improving the mold galling and whitening peeling resistance of the coated surface when subjecting the material to which the coating composition of the present invention is applied.
On the other hand, since adding a lubricant to a coating film generally reduces recoatability, it is an important issue to strike a balance between mold galling resistance, whitening peeling resistance, and recoatability. In the coating composition of the present invention, a polyolefin wax, preferably having a molecular weight of 1,500 to 1,500, is used as a lubricant.
1 to 10% by weight of low-molecular polyolefin such as polyethylene or polypropylene of about 3000, and molybdenum disulfide, preferably with a particle size of 10μ or less and a purity of 99.8%.
0.5 to 5% by weight of the above molybdenum disulfide and a silicone resin, preferably 0.05 to 1% by weight of a special silicone resin such as an alkylsilane represented by polyoxyalkylsilane having a polyalkyl group, are used. In this case, graphite, silicone oil, etc. may be used if only to provide lubricity to the coating film, but since graphite is black, it is not possible to obtain a desired color, and silicone oil is not suitable for lubricity. It is not suitable for use in the present invention because it has too much properties and causes peeling and paint repellency when the top coat is applied over and over again. If the amount of the polyolefin wax blended is less than 1% by weight, there will be no lubricating effect, and if it exceeds 10% by weight, surface gloss, blocking properties, recoatability, etc. will deteriorate, which is not preferable, and a particularly preferable range is 4 to 4. It is 8% by weight. If the content of molybdenum disulfide does not reach 0.3% by weight, there will be no lubricating effect, and if it exceeds 5% by weight, corrosion resistance will decrease, which is not preferable. A particularly preferred amount is 0.5 to 3.0% by weight. If the amount of the silicone resin blended is less than 0.05% by weight, there will be no lubricating effect, and if it exceeds 1% by weight, the recoatability will be greatly reduced, which is not preferable. A particularly preferred range is 0.2 to 0.5% by weight. In addition, the amount of the above three types of lubricants is 3 to 3.
Preferably it is 10% by weight, particularly preferably 4% by weight.
~8% by weight. In addition to the above-mentioned essential components, the coating composition according to the present invention may optionally contain colored pigments clay such as titanium oxide, Bengara, Shinin Blue, and Carbon Black, and extender pigments such as barium sulfate, calcium carbonate, and silica. etc. can be used in combination, and other commonly used ingredients can also be added. The coating composition of the present invention can be produced by mixing and dispersing using a conventional roll mill, sand grind mill, etc., but the polyolefin wax and silicone resin may be added and mixed at the time of dispersion or when the coating is used. According to the present invention, the urethane-modified epoxy resin composition as described above, a rust-preventing pigment with a water-soluble content of 1% by weight or less, and three specific types of lubricants are combined in a paint composition. It is possible to improve the unachievable mold galling during pulsing processing, and furthermore, it is possible to maintain performances such as recoatability, corrosion resistance, and durability at the same level or higher. Materials to which the coating composition of the present invention is applied include:
These include galvanized steel sheets, zinc-plated steel sheets, aluminum-plated steel sheets, stainless steel sheets, etc. These materials are subjected to surface treatment as necessary, and a dry film thickness of approximately 1 to 8 μm is applied using a curtain flow coater, roll coater, etc. After coating, the material temperature is 200 to 240℃. Dry within the range. As a drying method, for example, a hot air oven, an infrared oven, etc. can be applied. EXAMPLES Hereinafter, the present invention will be explained in more detail based on Examples, but it goes without saying that these do not limit the scope of the present invention. In the following examples, "part" means part by weight. Examples 1 to 9 and Comparative Examples 1 to 3 Raw materials other than xylene shown in Tables 1 and 2 were simultaneously added and mixed, dispersed with a sand grind mill to a maximum particle size of 15 μm, and then Coating compositions of Examples 1 to 9 and Comparative Examples 1 to 3 were manufactured by blending xylene. These coating compositions were then chromated
Apply the coating to a 0.05 mm thick electrogalvanized board (area weight 30 g/m 2 ) with a bar coater to a dry film thickness of 1.5 to 2.0 μm, and immediately heat the plate in a hot air oven for 45 seconds to reach a maximum board temperature of 200°C. A test piece was obtained. This test piece was tested for workability, SST resistance, mold galling resistance, and repaintability. Results first
Shown in Table and Table 2.
【表】
◎：優 ○：良（目標水準） △：可 ×：不可
[Table] ◎: Excellent ○: Good (target level) △: Possible ×: Not possible
【表】【table】
Claims (1)
（a1）と脂肪族二塩基酸（a2）と第１級ヒドロ
キシル基を持つ第２級アミン（a3）とを反応さ
せてなる末端に第１級ヒドロキシル基を持つプ
レポリマー(A)と(ロ)ポリイソシアネート化合物
（b1）とイソシアネート保護剤（b2）を反応さ
せてなる部分保護イソシアネート化合物(B)とを
（Ａに含まれる第１級ヒドロキシル基の数）／
（Ｂに含まれる遊離のイソシアネート基の数）
の比が10／１〜１／１となるように反応させて
なるウレタン変性エポキシ樹脂組成物40〜70重
量％、 () 水可溶分が１重量％以下の防錆顔料 15〜
25重量％ () ポリオレフインワツクス １〜10重量％、 () 二硫化モリブデン 0.5〜５重量％及び () シリコーン樹脂 0.05〜１重量％ を含んでなることを特徴とするプレコート鋼板用
塗料組成物。 ２ 防錆顔料としてストロンチウムクロメートと
複合リン酸アルミニウムの両者を含む特許請求の
範囲第１項に記載のプレコート鋼板用塗料組成
物。[Claims] 1 () (a) A bisphenol A type epoxy resin (a 1 ), an aliphatic dibasic acid (a 2 ), and a secondary amine having a primary hydroxyl group (a 3 ). A prepolymer (A) having a primary hydroxyl group at the end obtained by the reaction, and (b) a partially protected isocyanate compound (B) obtained by reacting a polyisocyanate compound (b 1 ) with an isocyanate protecting agent (b 2 ). (number of primary hydroxyl groups contained in A)/
(Number of free isocyanate groups contained in B)
40 to 70% by weight of a urethane-modified epoxy resin composition reacted in a ratio of 10/1 to 1/1;
A coating composition for a precoated steel sheet, comprising: () 25% by weight of polyolefin wax, () 1 to 10% by weight of polyolefin wax, () 0.5 to 5% by weight of molybdenum disulfide, and () 0.05 to 1% by weight of silicone resin. 2. The coating composition for precoated steel sheets according to claim 1, which contains both strontium chromate and composite aluminum phosphate as antirust pigments.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58201073A JPS6094466A (en) | 1983-10-28 | 1983-10-28 | Coating material composition for precoated steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58201073A JPS6094466A (en) | 1983-10-28 | 1983-10-28 | Coating material composition for precoated steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6094466A JPS6094466A (en) | 1985-05-27 |
| JPS6328935B2 true JPS6328935B2 (en) | 1988-06-10 |
Family
ID=16434938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58201073A Granted JPS6094466A (en) | 1983-10-28 | 1983-10-28 | Coating material composition for precoated steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6094466A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62225569A (en) * | 1986-03-27 | 1987-10-03 | Nippon Paint Co Ltd | Primer composition for metal material and coating thereof |
| JPH0692565B2 (en) * | 1986-07-15 | 1994-11-16 | 日本ペイント株式会社 | Topcoat coating composition for roll coater |
| JPH01122432A (en) * | 1987-11-06 | 1989-05-15 | Sky Alum Co Ltd | Highly-slidable precoated metal sheet |
| JPH0670870B2 (en) * | 1990-12-28 | 1994-09-07 | 株式会社神戸製鋼所 | Aluminum plate material for floppy disk drive case |
| JP2690629B2 (en) * | 1991-04-12 | 1997-12-10 | 川崎製鉄株式会社 | Organic composite coated steel sheet with excellent corrosion resistance and spot weldability |
| JP2707168B2 (en) * | 1991-07-19 | 1998-01-28 | 日本鋼管株式会社 | Organic composite coated steel sheet having excellent external rust resistance and excellent image clarity and method for producing the same |
| JP3143046B2 (en) * | 1995-07-31 | 2001-03-07 | 日本鋼管株式会社 | Organic composite coated steel sheet with excellent press formability and perforated corrosion resistance |
-
1983
- 1983-10-28 JP JP58201073A patent/JPS6094466A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6094466A (en) | 1985-05-27 |
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