JP6235329B2 - シロキサン−ウレタン防汚コーティング - Google Patents
シロキサン−ウレタン防汚コーティング Download PDFInfo
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- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
- C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
- C08G18/792—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
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- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
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Description
実験方法
実施例に用いられる原材料を以下に示す。
擬似フジツボ引き剥がし強度試験
本試験は、参考文献(Kohl JG&Singer IL、Pull−off behavior of epoxy bonded to silicone duplex coatings、Progress in Organic Coatings、1999、36:15−20)に記載の手順に変更を加えて、Instron社製の機器(商品名Instron(商標) Model 1122)を用いて実施した。直径10ミリメートルのアルミニウム製の鋲を、エポキシ系接着剤(Henkel Loctite Americas社(www.loctite.com)製、Hysol(登録商標)1C)を用いてコーティング済みパネルの表面に貼付した。約1時間の硬化後、はみ出したエポキシを除去した。次いで上記エポキシ系接着剤を、3日間以上室温で硬化させた。その後、上記鋲を、Instronによってコーティング済み表面から引き剥がした。各試験において、2つ以上、好ましくは3つの反復試験片を用い、引き剥がし強度(単位MPaで測定した)の平均値を求めた。擬似フジツボ引き剥がし強度の閾値は0.6MPaであった。
AST Products社製VCA Optima接触角測定器を用いて、上記コーティングの水接触角を測定した。0.5〜1μLの水滴を、コーティング済み表面に載置した。平衡時間の後、接触角を測定した。接触角が大きいほど、コーティング済み表面の疎水性は高い。防汚コーティングには、100°以上の接触角が必要となる。
Gardner社製衝撃試験機を用い、ASTM D2794に従って、上記コーティングの耐衝撃性を求めた。本試験では、コーティングの表面に静置された圧子の上に錘を落下させる。上記錘は既知の高さから落下され、上記圧子がコーティング済みパネルに凹みを形成する。上記凹み又はその周辺における、コーティングのひび割れや剥離を観察する。ひび割れや剥離を起こした力を、インチポンド(in−lb)で記録する。160in−lbsまでの範囲で、コーティング破損を起こさなかった最大の力を記録する。本試験は、コーティングを上向きにし、コーティングに直接的に(直接)衝撃を与えて行われる。耐衝撃性の閾値は80in−lbsであった。
ASTM D3359に従って、交差接着力を測定した。許容可能な接着力と見なされるのは、評価4B又は5Bである。
硬化後のパネルを、5日間熱湯(80℃)に浸漬した。湯浴からパネルを引き揚げ、乾燥させた後、実験室温度まで冷却した。交差接着力試験の際にマーキングされた領域で、コーティングの剥離、膨れ、発泡等を目視で確認した。破損が確認されなかった場合、上塗りは接着力の面で合格とした。
ワイヤーバー又は8面式ウェットフィルムアプリケーターを用いて、クロメート処理されたアルミニウム、及びリン酸処理された鋼の4インチ×12インチのパネルにコーティングを塗布した。これらのパネルは、糸くずの出ない布とIPAで拭き取ることで油分を除去し、圧縮空気又は窒素で乾燥させた。コーティング後のパネルは、試験前に相対湿度(RH)50%、実験室温度(約24℃)の条件で7日間以上硬化させた。
実施例1〜29、比較例1〜3
二重非対称遠心分離機FlackTek SpeedMixwer(商標)(型名DAC 150 FV−K、FlackTek社製)を用いてコーティングを調製した。配合は以下のように行った。
1.組成表に別の溶媒が指定されていない限り、MIBKと、プロピオン酸n−ブチルと、プロピオン酸n−プロピルと、を同重量部ずつ配合し、溶媒混合物を調製した。
2.上記の溶媒混合物と、1%DBTDLとを用いて、1%の触媒溶液を調製した。
3.上記のポリオールと、溶媒と、触媒溶液と、(組成に記載があれば)接着促進剤とをSpeedMixerのカップに投入した。
4.これらを約3000rpmで30秒混和した。
5.イソシアネート官能性成分をSpeedMixerのカップに投入した。
6.これらを約3000rpmで30秒混和した。
7.パネルに塗布し、上述の通り硬化させた。
以下の比較例は、2Kウレタンシステムである。ただし、比較例は、性能と、硬化したコーティングの組成とが本発明と異なる。
Claims (7)
- 二液型硬化性組成物であって、
(a)一以上の多官能アクリル系ポリオールを含む一液と、
(b)(i)二以上のイソシアネート官能基を有する一以上のポリシロキサンポリマーと、(ii)一以上のイソシアネート官能性有機化合物と、を含む二液と、
(c)溶媒と、を含むことを特徴とする、組成物。 - 請求項1または2に記載の組成物であって、顔料、染料、つや消し添加剤、硬化触媒、流れ及び平滑剤、脱気添加剤、接着促進剤、分散促進剤、難燃化剤、熱安定剤、光安定剤、酸化防止剤、可塑剤、静電防止剤、紫外線(UV)吸収剤、潤滑剤、又はこれらの組み合わせ、のうち1以上を更に含むことを特徴とする、組成物。
- 請求項3に記載の組成物であって、前記接着促進剤は3−グリシジルオキシプロピルトリメトキシシランであることを特徴とする、組成物。
- 請求項2〜4のいずれか1項に記載の組成物であって、
(a)前記ポリシロキサンポリマーが、前記硬化性組成物の総固体重量に対して2〜40重量%であり、数平均分子量が4,000〜15,000の範囲であり、
(b)前記多官能性ポリオールが、前記硬化性組成物の総重量に対して35〜60重量%であり、かつ、Tgが0℃〜45℃、数平均分子量が2,000g/mol〜25,000g/molのアクリル系ポリマーであり、
(c)前記イソシアネート官能性有機化合物が、前記硬化性組成物の総重量に対して8〜30重量%であり、かつ、ヘキサメチレンジイソシアネート(HDI)、イソホロンジイソシアネート(IPDI)、メチレンビス(p−シクロヘキシルイソシアネート)(H12MDI)、メタ−テトラメチルキシレンジイソシアネート(m−TMXDI)、シクロヘキシルジイソシアネート(CHDI)、1,3−ビス(イソシアナトメチル)シクロヘキサン、1,4−ビス(イソシアナトメチル)シクロヘキサン、ジイソシアネートの三量体、及びこれらの混合物からなる群から選択されることを特徴とする、組成物。 - 基板を被覆する方法であって、
(a)二液型硬化性組成物であって、
(i)一以上の多官能アクリル系ポリオールを含む一液と、
(ii)(A)二以上のイソシアネート官能基を有する一以上のポリシロキサンポリマーと、(B)一以上のイソシアネート官能性有機化合物と、を含む二液と、
(iii)溶媒と、を含む組成物を得る手順と、
(b)顔料、染料、つや消し添加剤、硬化触媒、流動及び平滑剤、脱気添加剤、接着促進剤、分散促進剤、難燃化剤、熱安定剤、光安定剤、酸化防止剤、可塑剤、静電防止剤、紫外線(UV)吸収剤、潤滑剤、又はこれらの組み合わせ、のうち1以上を混合する任意の手順と、
(c)手順(a)及び(b)で得られた組成物を基板に塗布し硬化させる手順と、を含むことを特徴とする方法。 - 請求項6に記載の方法で製造された、被覆体。
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