JP6868624B2 - 樹脂組成物およびこれを用いた黒色樹脂鋼板、およびその製造方法 - Google Patents
樹脂組成物およびこれを用いた黒色樹脂鋼板、およびその製造方法 Download PDFInfo
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- JP6868624B2 JP6868624B2 JP2018529263A JP2018529263A JP6868624B2 JP 6868624 B2 JP6868624 B2 JP 6868624B2 JP 2018529263 A JP2018529263 A JP 2018529263A JP 2018529263 A JP2018529263 A JP 2018529263A JP 6868624 B2 JP6868624 B2 JP 6868624B2
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- 239000011342 resin composition Substances 0.000 title claims description 33
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- QYMFNZIUDRQRSA-UHFFFAOYSA-N dimethyl butanedioate;dimethyl hexanedioate;dimethyl pentanedioate Chemical compound COC(=O)CCC(=O)OC.COC(=O)CCCC(=O)OC.COC(=O)CCCCC(=O)OC QYMFNZIUDRQRSA-UHFFFAOYSA-N 0.000 claims description 3
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
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- MPNNOLHYOHFJKL-UHFFFAOYSA-N peroxyphosphoric acid Chemical class OOP(O)(O)=O MPNNOLHYOHFJKL-UHFFFAOYSA-N 0.000 description 1
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- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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Description
前記コーティング層の全元素組成100重量%に対して、炭素(C):70〜80重量%、シリコン(Si):1〜4重量%、チタニウム(Ti):1〜5重量%、および残部酸素(O)を含むことができる。
前記樹脂組成物は、全組成物100重量%に対して、ポリエステル樹脂40〜50重量%を含むが、前記ポリエステル樹脂は、主樹脂および補助樹脂から構成され、前記主樹脂は、補助樹脂に比べて分子量が高く、前記主樹脂と補助樹脂とのガラス転移温度の差は、25℃以下である黒色樹脂鋼板の製造方法を提供することができる。
アルカリ脱脂された0.4mmの厚さの亜鉛メッキ鋼板を準備した。
前記実施例1と比較した時、実施例2は、分子量が23,000Mn、ガラス転移温度が7℃の主樹脂22.5g、および分子量が12,000Mn、ガラス転移温度が20℃の補助樹脂22.5gであるポリエステル樹脂を使用した。
前記実施例1と比較した時、実施例3は、ポリエチレン−ポリテトラフルオロエチレン2gから構成されたワックスを使用した。
前記実施例1と比較した時、実施例4は、ポリエチレン2gから構成されたワックスを使用した。
前記実施例1と比較した時、実施例5は、分子量が23,000Mn、ガラス転移温度が7℃の主樹脂25g、および分子量が12,000Mn、ガラス転移温度が20℃の補助樹脂25gであるポリエステル樹脂を使用し、溶媒30gを使用した。
前記実施例1と比較した時、比較例1は、ポリエチレン0.17g、ポリエチレン−ポリテトラフルオロエチレン0.13g、および液状のシリコン1.7gから構成されたワックスを使用した。
前記実施例1と比較した時、比較例2は、クロムフリー下塗り被膜の付着量を2,500mg/m2で製造した。
前記実施例1と比較した時、比較例3は、前記耐摩耗性粒子が平均粒径15μm、20μmの粒子をそれぞれ2g、1g含んだ。
前記実施例1と比較した時、比較例4は、ポリエステル樹脂が分子量19,000、ガラス転移温度が10℃である1種の樹脂を用いた。
前記実施例1と比較した時、比較例5は、ポリエステル樹脂が分子量12,000、ガラス転移温度が20℃である1種の樹脂を用いた。
前記実施例1と比較した時、比較例6は、分子量が12,000、ガラス転移温度が5℃の樹脂20g、および分子量が10,000、ガラス転移温度が35℃の樹脂25gであるポリエステル樹脂を使用した。
実験例1:摩擦係数評価実験
摩擦試験機で黒色樹脂鋼板表面の摩擦係数を評価した。黒色樹脂鋼板試験片を148X290mmの大きさに剪断した後、摩擦係数を測定した。加圧力600kgf、移動速度3.3mm/sの条件で測定した。また、速乾性打抜油の塗布による摩擦係数の影響性確認のために、打抜油塗布後の摩擦係数を比較した。
前記実施例および比較例で製造された黒色樹脂鋼板を用いて、引張0t−ベンディング(bending)後、テープ剥離およびベンディング部クラックの観察により加工性を評価した。黒色樹脂鋼板試験片を35X150mmの大きさに剪断した後、20%引張し、0t−ベンディングした後、ベンディング部にニチバン(Nichiban)テープを密着後に剥がして、塗膜剥離の有無を検査した。この後、0t−ベンディング部をステレオスコープで観察してクラックの発生程度を検査した。この時、塗膜の密着性が劣る場合、テープに塗膜が付くようになる。また、ベンディング部を顕微鏡で観察すると、加工部が曲げおよびテープ剥離後にも安定的に維持されるか否かを確認することができ、クラックの発生程度を把握することができる。これによって、プレス材周縁のカーリング(Curling)部のように塗膜の変形が激しい部位で良好な加工性の確保が可能である否かを予測することができる。
前記実施例および比較例で製造された黒色樹脂鋼板を用いて耐沸騰性を評価した。鋼板を沸騰水に2時間浸漬して取り出した後、表面の変化程度を確認するもので、表面硬化力に劣る場合、沸騰水がコーティング層の内部に侵入して、ブリスター(コーティング層の膨れ現象)のように表面の深刻な変化を誘発することがある。
黒色樹脂鋼板を100X100mmの大きさに剪断した後、試験片のバリ(Burr)を除去した後、黒色面と非黒色面とを対向させて、ホットプレス(Hot press)機器を用いて、温度80℃、加圧力100kgf/cm2、8時間の条件で耐スティッキング性を評価した。実験終了後、ホットプレートの上板は試験片から離隔し、加熱ランプも消えて試験片は常温まで冷却される。この後、対向する一対の試験片を引き離す時の力の程度を評価する。
8点:指で試験片を軽く押した時に試験片分離可能
6点:試験片の変形が発生せず、試験片分離のための器具不要
4点:爪を試験片の間に入れて力を加えることで分離可能であるが、試験片の変形発生(反り)
2点:スパチュラ(Spatula)または類似器具を用いてこそ分離可能
0点:2点に該当する器具を用いたが、分離不可能な場合
前記耐スティッキング性評価は、黒色樹脂鋼板がコイル巻取状態で運送される過程で黒色面−非黒色面が相互反応によってくつっくか否かおよびその程度を評価する方法である。
ビード(Bead)は、プレス成形時、素材を固定することで素材が中に吸い込まれるのを固定する役割を果たす部分である。通常、プレス過程で剪断されるが、ビード部塗膜でスクラッチ、剥離などの損傷が発生した場合、剥離物が金型に転写されて、後続の作業材にデントなどの欠陥を誘発する。したがって、本評価によりこれを事前に模写することによって、安定したプレス連続作業が可能か否かを判断することができる。44X250mmの大きさに剪断した後、図3のようにドローイング長さ90mm、加圧荷重1000kgfの条件で評価した。毎評価が終わった後、金型を2000グリット(grit)の紙やすりで拭いてアルコールで洗浄して、前の評価素材の影響を最小化した。この時、速乾性打抜油の塗布による影響性確認のために、打抜油塗布後を基準に評価を進行させた。速乾性打抜油は、(株)VS&EinケミカルのMVP840TW非水溶性焼成加工油を使用した。
Claims (9)
- 全組成物100重量%に対して、ポリエステル樹脂40〜50重量%、メラミン樹脂3〜10重量%、耐摩耗性粒子1〜5重量%、ワックス0.1〜3重量%、酸触媒0.3〜1.5重量%、顔料3〜5重量%、添加剤2〜5重量%および残部の溶媒を含み、
前記ポリエステル樹脂は、第1樹脂および第2樹脂から構成され、
前記第1樹脂は、前記第2樹脂に比べて分子量が高く、
前記第1樹脂のガラス転移温度と前記第2樹脂のガラス転移温度との差は、絶対値で25℃以下であり、
前記第1樹脂の分子量は、15,000Mn超過および80,000Mn以下であり、前記第2樹脂の分子量は、12,000Mn〜20,000Mnであり、
前記第1樹脂のガラス転移温度は5〜20℃であり、前記第2樹脂のガラス転移温度は20〜30℃であり、
前記ワックスは、ポリエチレン、ポリエチレン−ポリテトラフルオロエチレン、またはこれらの組み合わせを含む、樹脂組成物。 - 前記ポリエステル樹脂100重量%に対して、前記第1樹脂は、15〜50重量%含まれるものである、請求項1に記載の樹脂組成物。
- 前記耐摩耗性粒子は、ポリメチルメタクリレート、アクリル、またはこれらの組み合わせを含むものである、請求項1または2に記載の樹脂組成物。
- 前記溶媒は、プロピレングリコールメチルエーテルアセテート、ケトン系、ハイドロカーボン系、二塩基性エステル、またはこれらの組み合わせを含むものである、請求項1〜3のいずれか1項に記載の樹脂組成物。
- 前記酸触媒は、ジノニルナフタレンスルホン酸を含むものである、請求項1〜4のいずれか1項に記載の樹脂組成物。
- 前記顔料は、カーボンブラックおよびチタニウムオキサイドが混合された形態であり、
チタニウムオキサイドに対するカーボンブラックの重量比率は、1〜30である、請求項1〜5のいずれか1項に記載の樹脂組成物。 - 前記添加剤は、付着増進剤、レベリング剤、分散剤、および消光剤を含むものである、請求項1〜6のいずれか1項に記載の樹脂組成物。
- 前記付着増進剤は、ヒドロキシルホスフェートエステル、またはこれらの組み合わせを含むものである、請求項7に記載の樹脂組成物。
- 前記レベリング剤は、ポリアクリレート、ポリシロキサン、またはこれらの組み合わせを含むものである、請求項7または8に記載の樹脂組成物。
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