TWI354691B - Method of coating with lead-free electrodeposition - Google Patents
Method of coating with lead-free electrodeposition Download PDFInfo
- Publication number
- TWI354691B TWI354691B TW93105884A TW93105884A TWI354691B TW I354691 B TWI354691 B TW I354691B TW 93105884 A TW93105884 A TW 93105884A TW 93105884 A TW93105884 A TW 93105884A TW I354691 B TWI354691 B TW I354691B
- Authority
- TW
- Taiwan
- Prior art keywords
- mass
- acid
- electrodeposition coating
- pigment
- coating composition
- Prior art date
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- 238000004070 electrodeposition Methods 0.000 title claims description 56
- 238000000034 method Methods 0.000 title claims description 19
- 239000011248 coating agent Substances 0.000 title description 46
- 238000000576 coating method Methods 0.000 title description 46
- 239000000049 pigment Substances 0.000 claims description 47
- 229920005989 resin Polymers 0.000 claims description 41
- 239000011347 resin Substances 0.000 claims description 41
- 125000002091 cationic group Chemical group 0.000 claims description 36
- 239000008199 coating composition Substances 0.000 claims description 33
- 150000001875 compounds Chemical class 0.000 claims description 23
- 239000007787 solid Substances 0.000 claims description 19
- 239000011159 matrix material Substances 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 13
- 239000011230 binding agent Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 11
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 11
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 8
- 239000008397 galvanized steel Substances 0.000 claims description 8
- 150000001768 cations Chemical class 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000004132 cross linking Methods 0.000 claims description 2
- 238000005275 alloying Methods 0.000 claims 1
- 239000004570 mortar (masonry) Substances 0.000 claims 1
- -1 dioctyl octanoate monobutyltin Chemical compound 0.000 description 32
- 239000000203 mixture Substances 0.000 description 22
- 239000003822 epoxy resin Substances 0.000 description 14
- 229920000647 polyepoxide Polymers 0.000 description 14
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 239000005056 polyisocyanate Substances 0.000 description 11
- 229920001228 polyisocyanate Polymers 0.000 description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 10
- 239000003054 catalyst Substances 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 10
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 150000001412 amines Chemical class 0.000 description 7
- 239000003960 organic solvent Substances 0.000 description 7
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- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 6
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- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 6
- 238000000151 deposition Methods 0.000 description 6
- 230000008021 deposition Effects 0.000 description 6
- 125000005442 diisocyanate group Chemical group 0.000 description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 6
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- 230000003197 catalytic effect Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
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- 239000005058 Isophorone diisocyanate Substances 0.000 description 3
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 3
- 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 description 3
- BVFSYZFXJYAPQJ-UHFFFAOYSA-N butyl(oxo)tin Chemical compound CCCC[Sn]=O BVFSYZFXJYAPQJ-UHFFFAOYSA-N 0.000 description 3
- 235000015165 citric acid Nutrition 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 235000019253 formic acid Nutrition 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 3
- 239000004310 lactic acid Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 150000002924 oxiranes Chemical class 0.000 description 3
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- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 3
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- 229910052707 ruthenium Inorganic materials 0.000 description 3
- 235000019832 sodium triphosphate Nutrition 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RMVRSNDYEFQCLF-UHFFFAOYSA-N thiophenol Chemical compound SC1=CC=CC=C1 RMVRSNDYEFQCLF-UHFFFAOYSA-N 0.000 description 3
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 description 3
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- 238000010521 absorption reaction Methods 0.000 description 2
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- 125000003277 amino group Chemical group 0.000 description 2
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- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
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Description
1354691 九、發明說明: 【發明所屬之技術領域】 本發明係關於一種實質上具有無鉛化合物之陽離子電 沉積塗層組合物,特別是關於一種用組合物塗佈合金化熱 浸錢鋅鋼板’可形成優異耐ϋ性之端部及一般表面之方 法,及由此法獲得之經塗層物品。 【先前技術】 陽離子電沉積塗層組合物已使用於汽車之底塗車體及 零件,並要求形成具有高度耐蝕性之塗膜。然而,由環保 觀點而言,用作高度耐蝕性防鏽顏料之鉛化合物不佳。因 此,發展各種非毒性或低毒性、無#、防鏽顏肖並敛述於 JP-A-A-2000-309730 等。jP_A_200〇_3〇973〇 提出一種包含 具有鋅/石夕莫耳比為i ιη至2 5/1之驗性石夕酸鋅作為防錄顏 料之陽離子電沉積塗層組合物。 【發明内容】 本發明之目的為提供一種用具有防鏽顏料之無錯陽離 子電沉積塗層組合物塗佈合金化熱浸鍍鋅鋼板以形成優 異耐錄之電沉積塗層之方法,及由電沉積塗佈獲得之經 塗層物品。 赛於上述目的深人研究之結果,本發明可藉下列具體例 完成。 /此,本發明方法可用包含黏合劑樹脂及多種顏料之無 金。陽離子電沉積塗層組合物塗佈合金化熱浸鍵鋅鋼板,並 包括電沉積無錯陽料電⑽塗層组合物在合金化熱浸 91728 •6- 1354691 錢鋅鋼板上之步驟,其中黏合劑樹脂包含陽離子基質樹脂 及父聯劑,及顏料包含5至3〇質量%碟酸链及5至30質量% 具有孔隙度為0.44至K8毫升/克及平均顆粒大小為1〇微米 或以下之氧化石夕顏料。無錄陽離子電沉積之塗層組合物可 根據黏合劑樹脂之固體含量之質量進一步包含〇1至1〇質 量%單烷基錫化合物。 本發明之經塗層物品為—種物品如包含由上述方法用 ㈣㈣子電沉積塗膜塗佈之合金化熱浸鍍鋅鋼板之車 體。經塗層物品可包含多層薄膜,必要時,其具有底塗層' 中間塗層、超塗層等在無鉛陽離子電沉積塗膜上。 在用於本發明方法之無鉛陽離子電沉積塗層組合物 中,術語"無鉛"意指組合物實質上不含鉛(包括鉛化合物 内之鉛)。鉛之偵測限度因分析儀器之發展而逐年降低, 在本發明中,術語”無鉛”特指組合物之鉛含量為1〇ppm4 以下。 磷酸鋁顏料加入本發明方法所用之無鉛陽離子電沉積 之塗層組合物《磷酸鋁顏料之例包括二氫三聚磷酸鋁、偏 磷酸鋁及焦磷酸鋁。磷酸鋁顏料可單獨使用或互相組合使 用。磷酸鋁顏料對所有組合物内之顏料之值量比為5至3〇 質量%,較佳為10至20質量%。當質量%低於5質量%時, 組合物無法顯示足夠防独性。另一方面,當質量%高於3〇 質量%時,電沉積塗膜之平滑度會減少。 在本發明中,氧化矽顏料用作與磷酸鋁顏料組合脂肪姓 顏料。氧化矽顏料之孔隙度為0.44至1.8毫升/克,較佳為 91728 0.7至1_6毫升/克,氧化矽 以下,較佳為…微米。氧=均顆粒大小為職米或 含氧切料^分並;:其包 述乾圍内,如膠黏矽石或 隹上 ^ ,, ^ y 夕石之細粒。當氧化矽顏料 之孔隙度低於0.44毫升/克時,無錯陽離子電沉 夠耐㈣。另一方面’當孔隙度高於I』 耄升/克%’組合物之穩定 ,,^ 气疋度會減少。此外,當平均顆粒 /於1G微米時,電沉積塗層之外觀會劣化。 氧化石夕顏料對所有無斜陽離子電沉積之塗層组合物内 之顏料之值量比為5至30質量。心較佳為U)至20質量%。去 值量比低於5質量%時’ έ人 ,·且13物無法顯示偶而足夠防蝕 性。另一方面,合哲. I _ν 田 匕南於30質量〇/〇時,有減少電沉積 塗膜之平滑度之情況。 用於本發明方法之無鉛陽離子電沉積塗層組合物較佳 包含單烧基錫化合物作為固化觸媒(或嵌段聚異氰酸酷化 合物之解離觸媒)。單烧基錫化合物揮發性低,因而,在 ”且σ物之電沉積塗膜在電沉積塗佈後用切削底漆或中間 塗膜濕/濕塗佈然後烘培之情況下,或在塗敷切削底漆或 中間塗膜亚在烘焙電沉積塗膜後烘焙之情況下,很難轉移 成上塗膜。因此,使用單貌基錫化合物之形成的電沉積塗 膜在黏著至上塗膜方面優異’幾乎不會劣化上塗膜之表面 以顯不優異薄膜性能,因為觸媒不具揮發性。單烷基錫化 合物較佳為氧化單丁基錫,但對其無特殊限制。單烷基錫 化〇物之例包括二辛醒酸單丁基錫、三醋酸單丁基錫、三 1354691 苯甲酸單丁基錫'三辛酸單丁基錫、三月桂酸單丁基踢、 三肉豆㈣單丁基錫、〗甲酸單甲基錫、三醋酸單甲基 錫、三辛酸單甲基錫、三醋醆單辛基錫、三辛酸單辛基錫、 二月桂酸單辛基錫、三醋酸單月桂基錫、三辛酸單月桂基 錫、及二月桂酸單月桂基錫。此等烷基錫化合物可單獨或 以二種或多種化合物之組合使用。此外,其他下述解離觸 媒可與單烷基錫化合物使用,只要其不會減少本發明之不 利功效》 將單丁基錫化合物導入無鉛陽離子電沉積塗層組合物 内之方法不受特別限制。在單丁基錫化合物為固體之情況 下,單丁基錫化合物最好使用分散樹脂以及顏料分散。此 外,在單丁基錫化合物為液體之情況下,其可溶解於黏合 劑樹脂内或與黏合劑樹脂混合並導入作為部分黏合劑成 分。 單丁基錫化合物對黏合劑樹脂之固體含量之質量比較 佳為0.1至1〇質量%,更佳為〇 5至7 〇質量%。當單丁基錫 化合物低於0.1質量%,單丁基錫化合物之催化活性偶而會 不足》另一方面,當質量比增加超過1〇質量%時,催化活 性無法對應改良,而且有電沉積塗膜由爐烘培分解之情 況。 本發明方法所用之無鉛陽離子電沉積塗層組合物除了 單丁基錫化合物以外亦可包含鋅離子以增加固化效率。無 機鋅化合物如氧化鋅及氫氧化鋅或有機鋅化合物可用以 保持預定程度之鋅濃度。鋅化合物可單獨或與二種或多種 91728 -9- 化合物之組合使用° 有機鋅化合物之例包括有機單或二酸如甲酸、醋酸、丁 酸、己酸、辛酸、月桂酸、肉豆蔻酸、標櫊酸、硬脂酸、 山茶酸、新癸酸、丙烯酸、巴豆酸、異巴豆酸、十一碳烯 酸、油酸、芥酸、山梨酸、亞油酸'亞油嫦酸、聯笨基醋 酸、聯苯基丁酸、聯苯基丙酸、雙環戊炫鼓酸 '雙乙酿醋 酸、苯甲酸、曱基苯f酸、雙曱氧基苯甲酸、雙(第三丁 基)笨甲酸、雙羥基苯曱酸、酞酸酐、對酞酸、琥珀酸、 順丁烯二酸、順丁烯二酸酐、及反丁烯二酸酐之鋅鹽β 無释陽離子電沉積塗層組合物之鋅離子含量較佳為1 〇〇 至2,000 ppm,更佳為300至l,〇〇〇ppme當鋅離子含量低於 100 ppm時’後述解離觸媒無法顯示充分活性,導致電沉 積塗臈之固化不足。另一方面,當鋅離子含量高於2,〇〇〇 PPm時,薄膜之外觀及電沉積塗層作業性在特定情況下會 偶而劣化。 陽離子基質樹脂最好可使電沉積塗膜具有較高耐蝕 性。該陽離子基質樹脂之例包括胺基-環氧樹脂、含胺基 之丙烯酸樹脂、含胺基之聚酯樹脂等。其中,以胺基-環 氧樹脂較佳。可得胺基環氧樹脂,環氧樹脂之環氧環係 藉胺化合物如第一、第二或第三胺之酸性鹽開啟並陽離子 化。 用作原料供陽離子基質樹脂用之環氧樹脂可為多紛·聚 =水甘油越型環氧樹脂,其為表氣醇與多環狀盼化合物如 、雙盼F、雙盼S、笨盼_清漆、及甲盼祕清漆 1354691 或具有。号唑烷酮環之改質環氧樹脂間之反應產物。環氧樹 脂較佳為具有。号唑烷酮環之改質環氧樹脂。改質環氧樹脂 可藉環氧樹脂與由二異氰酸酯化合物與一種活性氫化合 物間之反應製備之雙尿院化合物或與由二異氰酸酯化合 物與二種或多種活性氫化合物間之反應製備之雜尿烷化 合物之脫醇化反應獲得〇在使用具有„号唑烷酮環之改質環 氧樹脂作為基質樹脂之情況下,電沉積塗膜在耐蝕性與物 性方面均優異。 陽離子基質樹脂之胺值較佳為3〇至13〇,更佳為4〇至 80,數目平均分子量較佳為〗,〇〇〇至2〇,〇〇〇。當胺值低於3〇 時,很難乳化陽離子基質樹脂。當胺值高於13()時,恐怕 會增加樹脂之導電性,進而降低氣體銷特性,減少庫倉 (Coulomb)效率,或在電沉積塗層作業性包括再溶解度等 方面不利。 如陽離子基質樹脂之酸之例包括水溶性有機酸如甲 酸 '醋酸、丙酸、乳酸、檸檬酸 '蘋果酸、酒石酸、丙烯 酸;及無機酸如鹽酸、磷酸、及胺磺醯酸,其中,以醋酸、 乳酸、丙酸、〒酸及胺橫醯酸較佳。 丧段聚異氰酸酯化合物及链化蜜胺樹脂較佳可用作交 聯劑。嵌段聚異氰酸酯化合物可使聚異氰酸酯化合物之異 氰酸酯基由嵌段劑完全或局部嵌段。嵌段聚異氰酸酯化合 物内之嵌段劑係在電沉積後於烘焙法内藉加熱解離,再生 異氰酸g旨基係與陽離子基質樹脂之活性氫基反應,藉此硬 化树脂。鍵化蜜胺樹脂係用醇如甲醇及丁醇謎化蜜胺獲 91728 -11 - 1354691 得。醚化蜜胺樹脂用陽離子基質樹脂轉移醚化以促進在電 沉積塗層作為嵌段聚異氰酸酯化合物後於烘焙過程内之 交聯反應。 用作嵌段聚異氰酸酯化合物材料之聚異氰酸酯化合物 之例包括脂肪族二異氰酸酯化合物如三亞甲基二異氰酸 酯、四亞甲基二異氰酸酯、五亞甲基二異氰酸酯、六亞甲 基二異氰酸酯、1,2-伸丙基二異氰酸酯、ι,2-伸丁基二異 氰酸酯、2,3-伸丁基二異氰酸酯、丨,3_伸丁基二異氰酸酯、 亞乙基二異氰酸酯、及亞丁基二異氰酸酯;脂肪族環狀二 異氰酸酯化合物如1,3-環戊烷二異氰酸酯、丨,4_環己烷二 兴氰酸酯' 1,2-環己纪二異氰酸醋、異弗爾嗣二異氰酸酯、 及原冰片烷二異氰酸酯;脂肪族_芳香族異氰酸酯化合物 如間伸苯二異氰酸酯、對伸苯二異氰酸酯、4,4,-聯基伸苯 一異氰酸酯、1,5-莕二異氰酸酯、丨+莕二異氰酸酯' 4,4,_ 二苯基甲烷二異氰酸酯' 2,4_或2,6_甲苯二異氰酸酯或其 混合物、4,4’-甲笨胺二異氰酸酯、及丨,4_二甲苯二異氰酸 酯;芳香族二異氰酸酯化合物如二茴香胺二異氰酸酯、 4,4’-二苯基醚二異氰酸酯、及氣二苯基二異氰酸酯·,三異 氰酸酯化合物如三笨基甲烷_4,4,,4"-三異氰酸醋、1>3,5_ 二異亂酸醋及2,4,6-三異氰酸醋甲苯;四異氰酸醋化合物 如4’4’-一 +基_二甲基甲烷-2,2,-5,5,-四異氰酸酯;及聚合 聚異氰酸酯化合物如甲笨二異氰酸酯二聚合物及甲苯二 異氰酸酉曰一聚合物。其中,較佳聚異氰酸酯化合物為異弗 爾酮二異氰酸自旨、原冰片境二異氰酸g旨及二苯基甲燒 91728 M2- 1354691 二異氰酸酯。 嵌段異氰酸酯之嵌段劑之例包括由化烴類如1 -氣-2-丙 醇及伸乙氯醇;脂肪族或雜環狀醇如正丙醇、呋喃醇、及 經烷基取代之呋喃醇:酚化合物如苯酚、間甲酚、對硝基 苯酚、對氯苯酚、及壬基苯酚、肟化合物如甲基乙基酮肟、 甲基異丁基銅朽、丙銅肋及環己嗣辟;活性亞甲基化合物 如乙醯丙酮、乙酿酷酸乙醋、及丙二酸二乙酷;脂肪族醇 如ε-己内醯胺、甲醇、乙醇、及異丙醇;芳香族醇如字醇; 二醇謎如乙二醇單甲酸、乙二醇單乙謎、及乙二醇單甲酸 等。笋中’以甲基乙基酮肟及ε -己内醯胺較佳。 在無鉛陽離子電沉積塗層組合物中,陽離子基質樹脂/ 交聯劑之固體含量比較佳為50/50至90/10質量,更佳為 6 0/40至80/20質量。當比率不在50/50至90/10範圍内時, 固化效率通常不足。 有機溶劑可與水用於無热陽離子電沉積塗層組合物 内。有機溶劑之例包括水混溶性有機溶劑如甲氧丙醇、乙 基溶纖劑、丙基溶纖劑、丁基溶纖劑'2-乙基己基溶纖劑、 正己基溶纖劑、甲醇、乙醇、異丙醇、正丁酵、異丁醇、 乙二醇二曱醚、二丙酮醇、丙酮、甲基乙基酮、〒氧丁醇、 二巧虎及乙二醇單乙醚醋酸酯;及水不混溶性有機溶劑如 二甲苯、甲苯、甲基異丁酮、己烷、四氣化碳、2·乙基己 醇、異弗爾酮、環己烷及苯。其中,較佳有機溶劑為丁基 溶纖劑、2-乙基己基溶纖劑、及正己基溶纖劑,其在薄膜 形成性方面優異。有機溶劑之量較佳為每1〇〇至質量份陽 91728 -13- 離子基貧樹脂之固體含量及交聯劑為〇· 1至10質量份。 在本發明中,雖然單燒基錫化合物可用作解離歲段劑之 解離觸媒’惟其他解離觸媒亦可使用。其他解離觸媒之例 包括有機錫合物如月桂酸二丁基錫、氧化二丁基錫及氧化 辛基錫,胺化合物如Ν甲基嗎啉;及金屬如鳃、鈷及銅 之鹽。解離觸媒對黏合劑樹脂之固體含量之質量比較佳為 0.1至1〇質量%,較佳為1.0至7.0質量%。當值量比低於0.1 貝1 /〇時催化活性通常不足。在另一方面,當質量比增 至超過10質量%時,催化活性無法相對改良,而且有電沉 積塗Μ係藉爐烘焙分解之情況。 此外,必要時,交聯樹脂粒子、顏料及各種添加劑可加 入無乱陽離子電沉積塗層組合物内。保持經塗層物品端部 厚度之效率可藉加入交聯樹脂粒子改良。交聯樹脂粒子可 自丙缔iil树鈿、環氧樹脂、酚樹脂、蜜胺樹脂等產生。自 生產容易性觀點而言,交聯樹脂粒子最好使用丙缔酸樹 脂。交聯樹脂粒子之數目平均粒子大小較佳為⑽至職 米。 用於組合磷酸鋁顏料與氧化矽顏料之顏料之例包括彩 色顏料如氧化钕、氧化鐵紅、及碳黑;油漆調和顏料如石夕 酸鋁及沉澱硫酸鋇;及防鏽顏料包括磷基鉬酸鹽,其為磷 基鉬酸及二或三價金屬如鋁、鐵、鈦、錘、錳、鈷、鎳、 銅、鋅及矽之鹽。在無鉛陽離子沉積塗層組合物含有該顏 料之情況下,組合物可進一步含有分散顏料之樹脂。 磷酸鋁顏料、氧化矽顏料及其他顏料之全部量,根據黏 較佳為0.5至50 合劑樹脂之固體含量為〇 2至丨〇〇質量份 質量份。 可藉分散上述成分於含有 和劑之有機溶劑與水之水 無錯陽離子沉積塗層組合物 水溶性有機酸或無機酸作為中 性介質内製備。 在本發明之方法中,無㈣離子沉積塗層組合物塗敷至 合金化熱浸鍍鋅鋼板。在本發明之較佳具體例中,無錯陽 離子沉積塗層組合物係用去離子水稀釋以具有固體漢度 為5至40質量%,較佳為15至25質量%,組合物之阳值調· 整至5.5至8.5,然後組合物導入電沉積浴内。電沉積塗膜 最好·在電沉積浴溫度為2G至35t '塗層電壓為i⑼至45〇v 及塗佈時間為1至5分知之條件下實施。在電沉積後焕培電 沉積塗膜之過程中,基質溫度為i⑼至2耽,較佳為14〇 至18〇°C ’固化時間為5至6〇分鐘’較佳為1〇至3〇分鐘。電 儿積塗膜《乾燥厚度適當為5至4〇微米,更佳為1〇至3〇微 米。可控制上述電沉積塗佈條件以得乾燥厚度。 馨 本發明之經塗層物品係藉本發明方法獲得,其中合金化 熱浸鍵鋅鋼板係用無船陽離子沉積塗層組合物塗佈。經塗 層物品可適當詩車體 '汽車轉等,肖彳底漆㈣及+ 間塗膜可形成在電沉積塗膜上,然後,必要時,超塗薄膜 如含有上光劑薄膜及透明薄膜可形成於其上。雖然電沉積 塗膜可如上述單獨烘=,惟其可在固化組合物以便同時烘 焙薄膜前用。切削底漆塗膜或中間塗膜濕/濕塗佈。切削 底漆塗膜、中間塗膜及超塗薄膜可使用已知組合物在塗佈 91728 -15- 1354691 汽車外板等之已知條件下形成。 【實施方式】 以下參照製造例、實例及比較例詳述本發明。須知實例 t ·'份"意指••質量份”。 [製造例1] 固化劑之製備 723份異弗爾酮二異氰酸酯、333份曱基異丁基酮及〇〇1 份二月桂酸二丁基錫加入設有攪拌器' 冷凝器、氮氣入口 管、溫度計及滴液漏斗之燒瓶内並加熱至70。(:。在均勻溶 解内令物後,滴入610份甲基乙基酮肘歷2小時,在保持反 應溫度在70°C下實施反應。在反應期間測定反應混合物之 紅外線光邊,持續反應,直到異氰酸g旨基之吸收消失為 止’以得固化劑。 [製造例2] 環氧化物改質之陽離子基質樹脂之製備 92伤2,4-/2,6 - —異乳酸甲本§旨(值量比8/2)、92份甲基異 丁基酮(MIBK)及0.5份二月桂酸二丁基錫加入設有搜拌 器、冷凝器、氮氣入口管、溫度計及滴液漏斗之燒瓶内, 21份甲醇滴入其中同時攪拌之》反應在室溫下開始,反應 混合物之溫度係藉熱產生作用上升至6〇。(:。在反應30分鐘 後,57份乙二醇單-2-乙基己醚自滴液漏斗滴入反應混合 物内’另外再加入42份雙酚A-氧化乙烯5莫耳加成物。反 應主要在溫度犯圍為6 0至6 5 C内實施,並測定紅外線光 譜,直到異氰酸酯基之吸收消失為止。 91728 -16- 1354691 365份具有環氧當量為188之環氧樹脂,其係自雙酚A及 表氣醇合成,加入如此所得之嵌段聚異氰酸酯内,反應溫 度上升至125°C。然後,1.0份芊基二曱胺加入混合物内, 並在130°C下反應’直到環氧化物當量變成41〇為止^ 87 份雙紛A加入燒瓶内並在12〇。(:下反應,結果,環氧化物 當量變成1,190。在冷卻所得混合物後,1丨份二乙醇胺、 24份N-曱基乙醇胺及25份胺基乙醇胺酮亞胺化合物之79 質量% MIBK溶液加入混合物内並在11 〇。〇下反應2小時。 然後,混合物係用MIBK稀釋,使非揮發性成分之比為 80%,以得具有陽離子基之環氧化物改質基質樹脂。 [製造例3] 主溶劑之製備 將672份(固體含量)製造例2所得之基質樹脂及209.1份 (固體含量)製造例1所得之固化劑均勻混合,根據固體含 置之質夏3質量%乙二醇單-2-乙基己醚加入所得混合物 内。甲酸加入所得混合物内,使中和比(中和樹脂之陽離 子基之比)為41.7%,加入25質量%醋酸辞與離子交換水 2 5 %水溶液以稀釋混合物,使固體含量之質量比為3 〇 〇質 量%。然後,在減壓下除去MIBK與水之混合物,直到固 體含量之質量比變成36.0質量%為止,以便製備主溶劑。 [製造例4] 顏料分散性清漆之製備 — 具有環氧化物當量為450份之雙酚型環氧樹脂與2·乙基 己醇-半嵌段異弗爾酮二異氰酸酯反應。所得物用丨_(2_經 91728 •17· 1354691 基乙基硫基)-2-丙醇及二羥甲基丙酸轉化成第三锍’以製 備樹脂清漆供分散具有第三锍轉化比為70.6質量%及固態 樹脂含量為6 0質量%之顏料。 [實例1] <無鉛電沉積塗層組合物之製備> 50.0份分散製造例4製造之顏料之樹脂清漆' 100.0份離 子交換樹脂及100.0份下列顆粒狀混合物係藉砂磨機分 散,並進一步碾磨,直到顆粒大小變成10微米或以下為 止,以得含有52.0質量%固體含量之分散膏,其含有40質 量%氧化單丁基錫及顏料,以及12質量%固態樹脂。氧化 矽顏料之孔隙度為1.6毫升/克,其平均顆粒大小為3.9微 米。其結果顯示於表1。 [表1] 顆粒狀混合物 質量比 根據全部顏料之質量比 氧化單丁基錫 3 . 三聚磷酸鋁 20 20.6 氧化矽 20 20.6 氧化鈦 26 26.8 碳黑 1 1 高嶺土 30 31 然後,將2,000份去離子水、2,000份製造例3之主溶劑冬 500.0份分散膏混合以得具有固體含量為20.0質量%之無 鉛電沉積塗層組合物。氧化單丁基錫對黏合劑之固體含量 之質量比為0.5質量%,組合物之鋅離子含量為700 ppm。 91728 -18- 1354691 <電沉積塗層> 分別製備冷滾壓未加工鋼板之樣品及鍍鋅鋼板之樣 品。將各樣品脫脂並用作為負電極之以磷酸鋅為主化學處 理劑(商品名稱SURFDYNE 5000,Nippon Paint公司製造) 預處理,上述電沉積塗層組合物係在施加電壓為150至250 V及浴溫為30°C之條件下電沉積,以得具有乾燥厚度為25 微米之電沉積塗膜。電沉積塗膜用水洗滌並在170°C下烘 焙20分鐘。分析各電沉積塗膜之耐蝕性。其結果顯示於表 2。 91728 -19- 1354691 【2<】 比較例3 〇 41.2 41.2 16.6 〇 〇 〇 730 0.41 CN m ro 〇 m 比較例2 〇 〇 〇 30.9 26.8 Ρ 41.3 640 0.19 寸 <Ν 〇 CN* oo Ο ΓΛ 比較例1 S 30.0 〇 〇 26.8 Ρ 42.2 720 0.19 00 寸· 實例5 〇 15.4 15.7 26.8 ρ 41.1 700 0.20 in CN C\ CN CN 實例4 〇 30.0 CN 26.8 〇 37.0 720 0.19 CN OO <N 實例3 Ρ <Ν 30.0 26.8 Ξ 37.0 680 0.18 CN ί> CN 實例2 〇 〇 20.6 20.6 26.8 ρ 31.0 700 0.23 Ο cn 卜 CN 實例1 〇 20.6 20.6 26.8 ρ 31.0 700 0.18 in rn oo CN CN απ 氧化單丁基錫 三磷酸鋁 氧化矽 氧化鈥 碳黑 高嶺土 鋅離子含量(ppm) 平滑度(Ra; μηι) 耐蝕性試驗(冷軋鋼;切部) 埘蝕試驗(冷軋鋼:端部) 耐蝕試驗(鍍鋅鋼;切部) 耐蝕試驗(鍍鋅鋼:端部) 羝省 命ΦΊ <Η<㈣ 評估 蘧 y。I- 1ί<^φ·ν-φ1νί:运4: (% # 鉍)q4®N鉍 w # 如 H 0 W 鸽攻二#^蒜款嫦W 瓌^.1-蚌^碱
91728 -20- 1354691 <平滑度試驗> 根據JIS-B0601測定塗膜之表面粗糙度(Ra)。 <耐银性試驗> 所得經塗層物品受到耐蝕性試驗,包括16小時鹽噴、2 . 小時乾燥、4小時浸泡於鹽水中及2小時乾燥。重複耐钮性 試驗15次,及測定切斷部分一側上之膨脹寬度。 [實例2至6及比較例1至3 j 除了改變三聚鱗酸铭顏料、氧化石夕顏料及其他顏料之量 以外’以如貫例1相同方式製備無鉛電沉積塗層組合物、_ 電沉積至樣。Uff估其耐難。其結果㈤於表2。 由上述結果可知含有特定量之三聚磷酸鋁顏料及特定 量之氧化石夕顏料之無錄陽離子電沉積塗層組合物,顯示改 良耐m而不會在使用冷滾磨鋼板或鐘辞鋼板之情況下 降低平滑度。 在本發明之方法中,合金化熱浸鍍鋅鋼板係用包含具有 特定形狀之磷酸鋁顏料及氧化矽顏料之無鉛陽離子電沉 鲁 積塗屢組合物塗佈,藉此如此所得本發明之經塗層物品具 有優異耐純之端部及一般表面。此外,在使用含有單烷 基錫化合物之無鉛陽離子電沉積塗層組合物之情況下,形 成的塗膜在對上塗膜之黏著性方面優異,幾乎不會劣化上 塗膜之表面以顯不優異薄臈性能。此外,非揮發性觸媒+ 衣i兄及工業健康觀點而言較佳。本發明之經塗層物品具有 · 上述特性,因而可適當地用於需要高度耐蝕性之產品如 · 車體、汽車零件及家用電器用具。 91728 -21
Claims (1)
- 十、申請專利範圍: \種料合金化熱浸錢鋅鋼板之方法’其係用具有黏合劑 •月曰及少種顏料之無鉛陽離子電沉積塗層組合物進行塗 佈,該方法包括步驟為: 電沉積無鉛陽離子電沉積塗層組合物在合金化熱浸鍍 ’鋼板上纟中黏合劑樹脂包含陽離子基質樹脂及交聯 J及顏料包含5至3〇質量%碟酸铭顏料及5至3〇質量%具 有孔隙度為0.44至1.8毫升/克及平均顆粒大小為1〇微米或 以下之氧化矽顏料。 種士-申π專利範圍第1項之方法,其中基於黏合劑樹脂 固體含量之質量,無鉛陽離子電沉積塗層組合物包含O.i 至1〇質量%單烷基錫化合物。 3. 種經塗層物品,包含以如申請專利範圍第1或2項之方法 用無船陽離子電沉積塗層組合物塗佈之合金化熱浸鍍鋅 鋼板。 4. 如申叫專利範圍第3項之經塗層物品,其中經塗層物品為 車體。 91728
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JP2000309730A (ja) | 1999-04-27 | 2000-11-07 | Kansai Paint Co Ltd | カチオン電着塗料 |
KR100403466B1 (ko) * | 1999-12-20 | 2003-11-01 | 주식회사 포스코 | 박막수지코팅강판 하지용으로 사용되는 도포형크로메이트용액 |
JP4693207B2 (ja) * | 2000-05-23 | 2011-06-01 | 関西ペイント株式会社 | カチオン電着塗料 |
JP4060620B2 (ja) * | 2002-03-26 | 2008-03-12 | 日本ペイント株式会社 | 無鉛性カチオン電着塗料を用いる電着塗装方法 |
-
2003
- 2003-03-05 JP JP2003059026A patent/JP4204353B2/ja not_active Expired - Fee Related
-
2004
- 2004-03-03 WO PCT/JP2004/002682 patent/WO2004078857A1/en active Application Filing
- 2004-03-03 US US10/547,909 patent/US7294410B2/en not_active Expired - Fee Related
- 2004-03-03 CN CNB2004800056497A patent/CN1318524C/zh not_active Expired - Fee Related
- 2004-03-03 GB GB0518600A patent/GB2414481B/en not_active Expired - Fee Related
- 2004-03-03 CA CA2519855A patent/CA2519855C/en not_active Expired - Fee Related
- 2004-03-05 TW TW93105884A patent/TWI354691B/zh not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GB0518600D0 (en) | 2005-10-19 |
WO2004078857A1 (en) | 2004-09-16 |
TW200502339A (en) | 2005-01-16 |
GB2414481A (en) | 2005-11-30 |
GB2414481A8 (en) | 2005-12-05 |
CA2519855A1 (en) | 2004-09-16 |
CA2519855C (en) | 2011-06-14 |
JP4204353B2 (ja) | 2009-01-07 |
US20060124462A1 (en) | 2006-06-15 |
JP2004269581A (ja) | 2004-09-30 |
GB2414481B (en) | 2007-01-31 |
CN1318524C (zh) | 2007-05-30 |
CN1756809A (zh) | 2006-04-05 |
US7294410B2 (en) | 2007-11-13 |
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