201132799 六、發明說明： 【發明所屬之技術領域】 本發明係關於例如使用於電氣機器用框體等之導電性 優良的預敷鋁合金板。 【先前技術】 傳統上，以合成樹脂塗料塗佈鋁合金板表面而形成之 預敷鋁合金板，耐蝕性優良又輕量，而且，具有成形後無 需實施塗裝之優良特性。所以，預敷鋁合金板，被廣泛地 做爲家電製品及OA機器等電子機器之框體等的材料來應 用。 另一方面，該等電子機器通常會發生電磁波，當做框 體等之構件使用時，爲了抑制電磁波之不良影響，必須爲 具有導電性者。然而，將一般樹脂覆蓋於鋁合金板表面時 ’會帶電而發生各種電子上的故障。所以，上述合成樹脂 塗料（有機樹脂系塗料）使用具有導電性者。 具體而言，傳統以來，即有人提出具有如以下之導電 性的各種金屬塗裝板。 專利文獻1及專利文獻2，揭示了形成著含有特定比例 之磷酸鐵、石墨、碳黑等之導電性物質之有機塗層的複合 覆蓋鋁板。 專利文獻3 ’揭示了形成著含有金屬氧化物之塗膜的 導電性預敷金屬板。 專利文獻4 ’揭示了形成著含有特定比例之碳黑之有 -5- 201132799 機樹脂層的鋁合金板。 此外，專利文獻5、專利文獻6、專利文獻7、及專利 文獻8，則提出了於塗膜中含有絮片狀、鱗片狀、或球狀 之Ni塡料的方案。 專利文獻9、專利文獻1 〇、專利文獻η，則提出了於 塗膜中含有Ni微粒子之鋁板。 專利文獻12’提出了具有含Zr之樹脂之塗層的鋁板。 專利文獻1 3 ’則提出了規定著基材表面粗細度及樹脂 厚度之鋁板。 [專利文獻1 ]日本特開平5 - 3 0 9 3 3 1號公報 [專利文獻2]日本特開平5_3丨丨454號公報 [專利文獻3]日本特開平7_3丨3 9 3 0號公報 [專利文獻4]日本特開平7_9〇6〇4號公報 [專利文獻5]日本特開2〇〇4_68〇42號公報 [專利文獻6]曰本特開平5_32〇9 3 4號公報 [專利文獻7 ]日本特開平5 _ 6 5 6 6 4號公報 [專利文獻8]日本特開平7_246679號公報 [專利文獻9]日本特開平7_2丨丨丨3丨號公報 [專利文獻10]日本特開平7_3 1 4601號公報 [專利文獻1 1]日本特開平8_26765 6號公報 [專利文獻12]日本特開200丨一以73〇號公報 [專利文獻13]日本特開2〇〇9_〇34973號公報 【發明內容】 -6- 201132799 然而，上述傳統技術時，有機樹脂中必須含有多量之 如上所述之各種導電性物質，該等導電性物質，於有機樹 脂中成爲降低其塗膜性能的異物。亦即，因爲塗膜中存在 著多量之異物，使得負責黏結劑功能之有機樹脂的比例降 低，而大幅降低了塗膜之密貼性及成形性。 此外，電氣導電性方面，因爲導電性物質之分佈誤差 等，而有其値不安定的問題。近年來，隨著個人電腦之高 精度化及環境改善，抑制電磁波所導致之不良影響變得更 爲重要，傳統之導電性樹脂已無法充份對應。 所以，需要導電物質本身導通且極薄之膜厚亦可保持 之極微粒子。此外，樹脂塗層本身亦必須爲極細微之均一 極薄膜之性質的膜。如傳統技術之只以限制樹脂塗層厚度 來對應，在成形時或成形後之運搬時仍然很容易造成瑕疵 。導電性之預敷鋁合金板，例如，通常做爲框體等之材料 使用，因爲很容易被看到，故必須抑制瑕疵及指紋附著等 之外觀劣化。 此外，預敷鋁合金板係使用於利用壓製加工等之成形 。所以，故要求其爲成形時樹脂塗層不易發生龜裂及剝離 等之壓製加工等上之優良成形性。此外，亦要求耐腐蝕性 〇 本發明有鑑於相關問題，而提供具有優良導電性，而 且’耐瑕疵性及耐指紋性優良，以及’壓製加工性及耐蝕 性皆優良之導電性預敷鋁合金板。 本發明之導電性預敷鋁合金板（申請專利範圍第1項 201132799 )，係由：由鋁合金板所構成之基板、形成於該基板之單 面或兩面之化學塗層、以及形成該化學塗層上之樹脂塗膜 所構成，其特徵爲，該樹脂塗膜，含有：玻璃轉移溫度 100〜150°c之氨基甲酸酯樹脂、一次粒子徑5nm〜80nm之 矽酸膠、以及分子量1000〜16000之內部蠘，上述樹脂塗 膜，該樹脂塗膜整體之乾燥重量100重量份當中，含有 〜99重量份之上述氨基甲酸酯樹脂、0.95〜8 9.9 5重量份之 上述矽酸膠、以及0.05〜50重量份之上述內部蠟，上述樹 脂塗膜之膜厚T爲0.05/zm〜1.0/zm，上述基板之表面粗細 度Ra爲0.1//Π1〜0.8/zm，上述樹脂塗膜之膜厚T與上述基 板之表面粗細度Ra之比（T/Ra)爲0.07〜4.0。 本發明時，上述樹脂塗膜，具有如上述特徵之組成且 具有〇.〇5//m〜1.0"m之極小膜厚。所以，上述導電性預 敷鋁合金板時，即使不具有如傳統之多量而多量之導電性 物質之構造的塗層，形成於上述基板上之上述樹脂塗膜本 身亦可發揮導電性。所以，可以在抑制上述樹脂塗膜之密 貼性降低下，得到導電性。此外，可以在抑制壓製加工性 及耐蝕性降低下，提高導電性。此外，因爲上述樹脂塗膜 本身具有導電性，故幾乎沒有導電率之誤差等。 此外，上述樹脂塗膜發揮優良導電性之機構並未充份 理解。然而，至少如上面所述，藉由積極採用對具有0.1 # m〜0.8 // m表面粗細度Ra之基板，形成膜厚T爲0.05 v m 〜1.0 之上述樹脂塗膜，而且，樹脂塗膜膜厚T與上述 基板表面粗細度Ra之比（T/Ra )爲0.07〜4.0之構成，在後 201132799 面所述之實施例也獲得證實，可在維持優良壓製加工性及 耐蝕性下，得到優良導電性。 上述樹脂塗膜，如上面所述，從以上述特定厚度及組 成形成於上述特定表面粗細度之上述基板上的觀點而言， 具有優良導電性，然而，上述樹脂塗膜更含有上述特定量 之一次粒子徑爲5nm〜80nm之砂酸膠。 所以，可以進一步提高上述導電性預敷鋁合金板之導 電性。 此外，上述樹脂塗膜，含有100〜150t之相對較高之 玻璃轉移溫度的氨基甲酸酯樹脂。所以，上述樹脂塗膜， 同時具有高硬度之特性與強撥水性之特性。所以，上述樹 脂塗膜，難以形成瑕疵之耐瑕疵性、及指紋難以附著之耐 指紋性十分優良。 此外，上述樹脂塗膜，含有上述特定之內部蠟。所以 ，可以降低上述樹脂塗膜之表面摩擦係數，進而提高耐瑕 疵性及成形性。此外，可以縮小油份及水份之接觸角，進 而提高耐指紋性。此外，可提高壓製加工性。 如上所示，依據本發明，可以提供具有優良導電性， 而且，耐瑕疵性及耐指紋性優良，此外，壓製加工性及耐 蝕性亦優良之·導電性預敷鋁合金板。 【實施方式】 本發明之導電性預敷鋁合金板，如上面所述，係由： 由鋁合金板所構成之基板、形成於該基板之單面或兩面之 -9 - 201132799 化學塗層、以及形成於該化學塗層上之樹脂塗膜所構成。 上述基板，可以對應用途，而採用各種組成之鋁合金 板。具體而言，可以採用5000系、6000系、及其他各種鋁 合金系。 此外，基於得到高強度之導電性預敷鋁合金板之理由 ，構成上述基板之鋁合金，以含有1.0〜5.0質量％之Mg爲 佳。 上述基板之表面粗細度Ra爲0.1" m〜0.8# m。 上述基板之表面粗細度Ra爲0.1 // m以下時，除了工業 生產困難以外，尙有導電性可能降低的問題。另一方面， 表面粗細度Ra超過0.8/zm時，可能發生上述樹脂塗膜無法 完全覆蓋基板之塗膜不完全現象，進行使耐蝕性、壓製加 工性、耐瑕疵性、及耐指紋性等降低。 此外，形成於上述基板上之化學塗層，採用由利用磷 酸鹽、鉻酸鹽等之滲鉻處理、鉻化合物以外之磷酸鈦、磷 酸銷、磷酸鉬、磷酸鋅、氧化錐等之未滲鉻處理等之化學 塗層處理，即所謂化成處理所得到之塗層。 藉由該化學塗層之存在，可以提高由鋁合金板所構成 之基板與樹脂塗膜之密貼性。此外，實現優良耐蝕性，可 抑制水、氯化物等之腐蝕性物質浸透鋁合金板表面時所導 致之塗膜下腐蝕，而防止樹塗膜龜裂及塗膜剝離。 此外，上述滲鉻處理及未滲鉻處理等之化成處理方法 ，有反應型及塗佈型，本發明時，可以採用任何手法而無 任何妨礙。 -10- 201132799 其次，上述樹脂塗膜，含有氨基甲酸酯樹脂、矽酸膠 、及內部蠟。 構成上述樹脂塗膜之氨基甲酸酯樹脂，採用具有100 °C〜1 5 0 °c之特定玻璃轉移溫度者。玻璃轉移溫度爲1 00 °C 以下時，彈力降低，壓製成形等時，可能容易受損，而使 耐瑕疵性變差。此外，玻璃轉移溫度超過1 50 °c時，樹脂 之硬度較高，成形時，樹脂可能發生龜裂。 氨基甲酸酯樹脂之玻璃轉移溫度，可以藉由氨基甲酸 酯樹脂合成時之聚合度、及氨基甲酸酯樹脂原料之聚醇及 異氰酸酯之分子構造等之調整來進行控制。 此外，上述矽酸膠，係表面結合著羥基之非晶矽石粒 子。 原料狀態之矽酸膠，係使帶負電之非晶矽石粒子分散 於水中之膠狀粒子。於粒子表面，存在著- SiOH基、-OH-離子，而由鹼離子形成雙電層，藉由粒子間之反斥而使矽 酸膠溶液處於安定狀態。上述樹脂塗膜之矽酸膠，係燒結 原料狀態之矽酸膠而成者。 上述砂酸膨，係採用一·次粒子徑爲5nm〜80nm者。 將聚集前之分散狀態的各粒子，稱爲一次粒子，然而 ’上述一次粒子徑係該一次粒子之直徑。此外，將聚集後 之粒子稱爲二次粒子，二次粒子之直徑係指二次粒子徑。 上述矽酸膠之一次粒子徑爲5nm以下時，電阻可能變 大而使提高導電性之效果變小。另一方面，上述矽酸膠之 ~次粒子徑超過80nm時，可能導致上述化學塗層與上述樹 -11 - 201132799 脂塗膜間之密貼性降低，而使耐指紋性降低。 上述之各直徑，係進行矽酸膠之乾燥，而使用BET法 (比表面積測量法）求取比表面積，再由重量與密度進行 逆算來求取。 其次，上述內部蠟，係採用分子量爲1 000〜1 6000者 〇 內部蠘之分子量爲1 000以下時，上述樹脂塗膜可能過 軟，而使成形時等之瑕疵防止效果降低。另一方面，分子 量超過1 6000時，製造成本增大，實用性降低。此外，壓 製加工時，樹脂塗膜容易龜裂及剝離，進而使壓製加工性 變差。 此外，上述內部蠟，以一次粒子徑爲0.05 y m〜5 // m 爲佳（申請專利範圍第2項）。 內部蠘之一次粒子徑爲0.05ym以下時，可能難以得 到內部蠟之添加效果。另一方面，超過5/^m時，上述導電 性預敷鋁合金板之壓製成形時，蠟可能脫落。結果，可能 導致對溶劑之耐久性變差，即耐溶劑性變差。 上述內部蠟’例如，可以使用羊毛脂、棕櫚蠟、及聚 乙烯等。 上述內部蠟，最好爲聚乙烯蠟（申請專利範圍第3項 )° 聚乙烯蠟’因爲熔融溫度高、粒子形狀爲球狀，此時 ，可以無損導電性而提高耐瑕疵性》 此外’上述樹脂塗膜’該樹脂塗膜整體之乾燥重量 -12- 201132799 100重量份當中’含有10〜99重量份之上述氨基甲酸酯樹 脂、0.95〜89.95重量份之上述矽酸膠、及〇.〇5〜5〇重量份 之上述內部蠟。 上述氨基甲酸酯樹脂之含有量，爲1〇重量份以下時， 難以形成均質之樹脂塗膜，耐鈾性降低。另一方面，超過 9 9重量份時’砂酸膠之添加量減少，可能導致樹脂塗膜之 導電性降低。上述氨基甲酸酯樹脂之含有量，最好相對於 上述樹脂塗膜整體之乾燥重量100重量份爲50〜80重量份 〇 矽酸膠’只有含有少量，即可發現提高導電性之效果 。實際上，爲了得到充份提高導電性之效果，上述矽酸膠 之含有量’相對於上述樹脂塗膜整體之乾燥重量丨00重量 份，以〇 · 9 5重量份以上爲佳，5重量份以上更佳。 此外’從雖然提高導電性但化學塗層與樹脂塗膜之密 貼性可能降低之觀點而言，上述矽酸膠之含有量，相對於 上述樹脂塗膜整體之乾燥重量100重量份，以89.95重量份 以下爲佳。此外’含有其以上之矽酸膠，從導電性之提高 效果已達飽和之觀點而言，上述矽酸膠之含有量，相對於 上述樹脂塗膜整體之乾燥重量1〇〇重量份，以60重量份以 下爲佳，4 0重量份以下更佳。 此外，內部蠟之含有量爲〇.〇5重量份以下時，難以得 到上述導電性預敷鋁合金板之壓製成形時之瑕疵防止效果 。此外，超過50重量份時，於上述導電性預敷鋁合金板量 產製造工程，捲取該導電性預敷鋁合金板等時，內部蠟可 -13- 201132799 能滲出而降低生產性。此外，耐指紋性可能較差。內部蠘 之含有量，相對於上述樹脂塗膜整體之乾燥重量100重量 份，最好爲5〜4 0重量份。 此外，上述樹脂塗膜之膜厚τ爲0.05/zm〜1.0/zm。 上述樹脂塗膜之膜厚T超過1.0 V m時，上述樹脂塗膜 之電阻較大而降低導電性，且上述導電性預敷鋁合金板之 壓製成形時，上述樹脂塗膜容易發生龜裂及剝離等，而降 低成形性。此外，從維持耐蝕性之觀點而言，如上面所述 ，上述樹脂塗膜之膜厚T應爲0.05 /z m以上。 此外，上述樹脂塗膜之膜厚T與上述基板之表面粗細 度 Ra 之比（T/Ra)，爲 0.07 〜4_0。 上述T/Ra爲0.07以下時，有耐蝕性、壓製加工性、耐 瑕疵性、及耐指紋性降低之問題，另一方面，上述T/Ra超 過4.0時，除了工業生產困難以外，尙有導電性降低之問 題。 此外，上述樹脂塗膜，在不妨礙本發明之作用效果的 範圍，可以含有界面活性劑等之添加劑。添加界面活性劑 ，可以提高上述樹脂塗膜之導電性，然而，添加太多時， 可能使上述化學塗層與上述樹脂塗膜之密貼性降低。 上述樹脂塗膜，例如，藉由於形成著上述化學塗層之 上述基板塗佈樹脂塗料來形成。樹脂塗料之塗裝方法，例 如，可以採用滾筒塗佈法、輥塗法，浸漬塗佈法、噴霧法 等眾所皆知的各種手法。此外，塗佈該樹脂塗膜片塗料後 再使其硬化而得到樹脂塗膜之硬化條件，即燒結條件等， -14- 201132799 亦可以選擇各種條件。 此外，於上述導電性預敷鋁合金板，藉由針狀電極法 測量上述樹脂塗膜之20個不同部位之表面部位的電阻時， 應爲10個部位以上之表面部位的電阻爲30Ω以下且上述20 個部位之表面部位的電阻平均値爲1 0Ω以下（申請專利範 圍第4項）。 此時，可以配合各種用途來利用導電性。 此外，上述針狀電極法，係藉由將具有Φ 0.2mm之球 面狀針尖之純銅製針，置於樹脂塗膜表面，對針賦予針尖 不會貫通樹脂塗膜之荷重，於該狀態下，導通脫膜而露出 之基板與針之間，來測量針尖接觸之部分之樹脂塗膜之電 阻値的方法。 此外，上述20個不同部位，係於從A4板之試料之端部 至3 0mm內側，爲無誤差而平均分配的20個部位。 上述20個不同部位之表面部位的電阻當中，10個部位 以上之表面部位的電阻超過30Ω時，可能出現電磁波屏蔽 性不良的部分。 此外，上述20個不同部位之表面部位的電阻平均値超 過10Ω時，亦可出現電磁波屏蔽性不良的部分。 此外，上述導電性預敷鋁合金板，適合使用於對該導 電性預敷鋁合金板實施壓製成形，例如，適合使用於電氣 機器用框體或電子機器用框體等。 此外，上述電氣機器用框體或電子機器用框體，例如 ，爲個人電腦本體、CD-ROM、DVD、PDA等之電子機器 -15- 201132799 之框體、電視等之電氣機器之框體、FDD、MD、MO等之 記憶媒體外殼之閘板部分、以及各種其他物品。 [實施例] (實施例1 ) 本例時，係針對本發明之導電性預敷鋁合金板之實施 例及比較例進行說明。 本例時，係變化化學塗層、樹脂塗膜之構成等，製作 如後述表2所示之1 8種導電性預敷鋁合金板（試料E 1〜試 料E 1 8 )做爲本發明品、與後述表3所示之1 5種導電性預敷 鋁合金板（試料C 1〜試料C 1 5 )做爲比較品，實施各種性 能評估試驗。 以下，進行詳細說明。 試料E1〜試料E18之導電性預敷鋁合金板1，皆如第1 圖所示，係由以鋁合金板所構成之基板2、形成於該基板2 之單面或兩面之化學塗層3、以及形成於該化學塗層3之樹 脂塗膜4所構成。 試料C1〜試料C15之基本構成，與試料。〜試料e18 相同。 製作該等試料E1〜試料E18及試料C1〜試料ci5時， 首先’準備板厚1.0mm之5052-H34材做爲由鋁合金板所構 成之基板2°該基板2’係在〇·〇5〜1之範圍內變化表面粗 細度R a。製作各s式料（g式料ε 1〜試料ε 1 8及試料c 1〜試料 C15)所使用之基板2的表面粗細度Ra，如表2及表3所示。 -16- 201132799 其次’對該基板2’實施形成化學塗層3之化學塗層處 理。表1中’係本例所採用之4種化成處理（a〜d)。 化成處理a ’係以磷酸鹽處理來形成鉻量爲2〇mg/m2之 反應型鉻酸鹽塗層者。具體而言，係以將基板浸漬於化成 處理液之浸泡法來實施化成處理，其後，於約100 1之環 境實施乾燥。 化成處理b ’係以锆處理來形成锆量爲20mg/m2之反應 型非鉻酸鹽塗層者。處理方法與上述化成處理a相同。 化成處理c ’係以塗佈型滲鉻處理來形成鉻量爲20 mg/m2之塗佈型鉻酸鹽塗層者。具體而言，實施基板之脫 脂處理後’以輥塗法塗佈處理劑，其後，於約1 〇〇 t之環 境實施乾燥。 化成處理d ’係以塗佈型锆處理來形成鉻量爲20mg/m2 之塗佈型非鉻酸鹽塗層者。處理方法係與上述化成處理d 相同。 (表1 ) 記號 化學塗腊夕種類 條件 a 反應型鉻酸鹽 磷酸鹽處理 鉻量：20mg/m2 b 反應型非鉻酸鹽 锆處理 锆量：20mg/m2 c 塗佈型鉻酸鹽 塗佈型滲鉻處理 鉻量：20mg/m2 d 塗佈型非鉻酸驗 塗佈型锆處理 銷量：20mg/m2 其次，於上述化學塗層3上，形成樹脂塗膜4。樹脂塗 膜片塗料之塗裝方法，有如上所述之各種方法，本例時， 係利用輥塗法來實施，其後，於使基板表面溫度成爲約 -17- 201132799 230 °C之環境保持40秒來實施燒結處理並進行硬化，形成 具有如表2及表3所示之組成及膜厚T的樹脂塗膜。 上述樹脂塗膜用塗料，係將含有固體含量如表2及表3 所示之組成之氨基甲酸酯樹脂、內部蠘、矽酸膠之塗料， 以異丙醇、乙醇、乙二醇單正丁醚做爲溶媒來進行製作。 氨基甲酸酯樹脂，係採用玻璃轉移溫度70 °C〜1 7(TC、拉 張率1*70〜25〇%、斷裂應力4〇MPa以上者。各試料之製作 所使用之氨基甲酸酯樹脂的玻璃轉移溫度及調合量，如表 2及表3所示。 此外，內部蠟，採用一次粒子徑0.01〜6ym、分子量 5 00〜20000之聚乙烯蠟。各試料之製作所使用之內部蠟之 —次粒子徑、分子量、及調合量，如表2及表3所示。 此外，矽酸膠，係採用一次粒子徑3〜100nm者。各試 料之製作所使用之矽酸膠之一次粒子徑及調合量，如表2 及表3所示。 此外’表2及表3之氨基甲酸酯樹脂、矽酸膠、及內部 蠟之含有量’係相對於乾燥後之樹脂塗膜整體之重量100 重量份的量（重量份）。 -18- 201132799 (s®[Technical Field] The present invention relates to a precoated aluminum alloy sheet which is excellent in electrical conductivity, for example, used in a housing for an electric machine. [Prior Art] Conventionally, a pre-coated aluminum alloy plate formed by coating a surface of an aluminum alloy plate with a synthetic resin coating has excellent corrosion resistance and light weight, and has excellent characteristics of coating without forming. Therefore, the aluminum alloy sheet is widely used as a material such as a casing for an electronic device such as a home appliance or an OA machine. On the other hand, these electronic devices usually generate electromagnetic waves, and when used as a member such as a frame, in order to suppress the adverse effects of electromagnetic waves, it is necessary to have conductivity. However, when a general resin is applied to the surface of an aluminum alloy plate, it is charged and various electronic failures occur. Therefore, the above synthetic resin coating (organic resin coating) is electrically conductive. Specifically, various metal coated sheets having conductivity as described below have been proposed in the past. Patent Document 1 and Patent Document 2 disclose a composite coated aluminum plate in which an organic coating layer containing a conductive substance such as iron phosphate, graphite or carbon black in a specific ratio is formed. Patent Document 3' discloses a conductive precoated metal plate on which a coating film containing a metal oxide is formed. Patent Document 4' discloses an aluminum alloy sheet having a resin layer of -5-201132799 which contains a specific proportion of carbon black. Further, Patent Document 5, Patent Document 6, Patent Document 7, and Patent Document 8 propose a method in which a coating film contains a flake-like, scaly or spherical Ni-based material. Patent Document 9, Patent Document 1 and Patent Document η propose an aluminum plate containing Ni fine particles in a coating film. Patent Document 12' proposes an aluminum plate having a coating of a resin containing Zr. Patent Document 1 3' proposes an aluminum plate which defines the thickness of the surface of the substrate and the thickness of the resin. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei No. Hei. No. Hei. No. Hei. [Patent Document 5] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. Japanese Patent Laid-Open No. Hei 7-246679 (Patent Document No. 7) Japanese Patent Laid-Open Publication No. Hei 7-246679 (Patent Document 10) Japanese Patent Laid-Open No. 7_3 1 4601 [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. Contents -6- 201132799 However, in the above conventional technique, the organic resin must contain a large amount of various conductive materials as described above, and these conductive materials are foreign substances which lower the coating film properties in the organic resin. That is, since a large amount of foreign matter is present in the coating film, the proportion of the organic resin responsible for the function of the binder is lowered, and the adhesion and formability of the coating film are drastically lowered. Further, in terms of electrical conductivity, there is a problem of instability due to a distribution error of the conductive material. In recent years, with the high precision of personal computers and the improvement of the environment, it has become more important to suppress the adverse effects caused by electromagnetic waves, and conventional conductive resins have not been adequately compatible. Therefore, it is required that the conductive material itself is turned on and the extremely thin film thickness can also maintain the extremely fine particles. Further, the resin coating itself must also be a film of a very fine uniform film property. As in the conventional art, only the thickness of the resin coating is limited, and it is still easy to cause flaws during the forming or after the forming. The conductive pre-coated aluminum alloy sheet is usually used as a material such as a frame, and since it is easily seen, it is necessary to suppress deterioration in appearance such as flaws and fingerprint adhesion. Further, the pre-coated aluminum alloy sheet is used for forming by press working or the like. Therefore, it is required to have excellent formability in press working such as cracking and peeling of the resin coating layer during molding. In addition, corrosion resistance is also required. In view of the related problems, the present invention provides an electrically conductive pre-coated aluminum alloy which has excellent electrical conductivity and is excellent in 'scratch resistance and fingerprint resistance, and excellent in press workability and corrosion resistance. board. The conductive pre-coated aluminum alloy sheet of the present invention (patent scope 1st 201132799) is a substrate composed of an aluminum alloy sheet, a chemical coating formed on one or both sides of the substrate, and forming the chemical A resin coating film on a coating layer, comprising: a urethane resin having a glass transition temperature of 100 to 150 ° C, a citric acid gel having a primary particle diameter of 5 nm to 80 nm, and a molecular weight of 1,000 ～16000 internal crucible, the resin coating film containing ～99 parts by weight of the urethane resin, 0.95 to 89.9 parts by weight of the citric acid gel, and 100 parts by weight of the total dry weight of the resin coating film, And 0.05 to 50 parts by weight of the internal wax, the film thickness T of the resin coating film is 0.05/zm to 1.0/zm, and the surface roughness Ra of the substrate is 0.1//1 to 0.8/zm, and the resin coating film is The ratio (T/Ra) of the film thickness T to the surface roughness Ra of the above substrate is 0.07 to 4.0. In the present invention, the above resin coating film has a composition as described above and has a very small film thickness of 〇.5//m to 1.0" m. Therefore, in the case of the above-mentioned conductive pre-coated aluminum alloy sheet, the resin coating film formed on the substrate itself can exhibit electrical conductivity even without a coating having a structure of a conventionally large amount of a conductive material. Therefore, conductivity can be obtained by suppressing the decrease in the adhesion of the above resin coating film. Further, it is possible to improve conductivity while suppressing reduction in press workability and corrosion resistance. Further, since the above-mentioned resin coating film itself has electrical conductivity, there is almost no error in conductivity or the like. Further, the mechanism in which the above resin coating film exhibits excellent conductivity is not fully understood. However, at least as described above, the above-mentioned resin coating film having a film thickness T of 0.05 vm to 1.0 is formed by actively using a substrate having a surface roughness Ra of 0.1 #m to 0.8 // m, and a resin coating film The ratio of the thickness T to the surface roughness Ra of the substrate (T/Ra) is 0.07 to 4.0, and the examples described in the later paragraph 201132799 are also confirmed, and are excellent in maintaining excellent press formability and corrosion resistance. Electrical conductivity. As described above, the resin coating film has excellent conductivity from the viewpoint of forming the above specific thickness and composition on the substrate having the specific surface thickness, however, the resin coating film further contains the above specific amount. A slick gel having a primary particle diameter of 5 nm to 80 nm. Therefore, the electrical conductivity of the above-mentioned conductive pre-coated aluminum alloy sheet can be further improved. Further, the above resin coating film contains a relatively high glass transition temperature of a urethane resin of 100 to 150 tons. Therefore, the above resin coating film has both high hardness characteristics and strong water repellency characteristics. Therefore, the above-mentioned resin coating film is difficult to form the scratch resistance of the enamel, and the fingerprint resistance which is difficult to adhere to the fingerprint is excellent. Further, the above resin coating film contains the above specific internal wax. Therefore, the surface friction coefficient of the above resin coating film can be lowered, and the enthalpy resistance and formability can be improved. In addition, the contact angle of oil and moisture can be reduced to improve fingerprint resistance. In addition, press workability can be improved. As described above, according to the present invention, it is possible to provide an electrically conductive precoated aluminum alloy sheet which is excellent in electrical conductivity, excellent in scratch resistance and fingerprint resistance, and excellent in press workability and corrosion resistance. [Embodiment] The conductive pre-coated aluminum alloy sheet of the present invention, as described above, is composed of: a substrate composed of an aluminum alloy sheet, a -9 - 201132799 chemical coating formed on one or both sides of the substrate, And a resin coating film formed on the chemical coating layer. The above-mentioned substrate can be made of an aluminum alloy plate of various compositions in accordance with the use. Specifically, a 5000 series, a 6000 series, and various other aluminum alloy systems can be used. Further, the aluminum alloy constituting the above-mentioned substrate is preferably contained in an amount of 1.0 to 5.0% by mass of Mg, for the reason that a high-strength conductive pre-coated aluminum alloy sheet is obtained. The surface roughness Ra of the substrate is 0.1 "m~0.8# m. When the surface roughness Ra of the substrate is 0.1 / m or less, in addition to industrial production difficulties, the conductivity may be lowered. On the other hand, when the surface roughness Ra exceeds 0.8/zm, the coating film may not completely cover the incomplete coating film of the substrate, and the corrosion resistance, press formability, smash resistance, and fingerprint resistance may be lowered. . Further, the chemical coating layer formed on the substrate is etched by chromizing with phosphate, chromate or the like, titanium phosphate other than chromium compound, phosphoric acid pin, molybdenum phosphate, zinc phosphate, oxidized cone, or the like. A chemical coating treatment such as treatment, that is, a coating obtained by a so-called chemical conversion treatment. By the presence of the chemical coating layer, the adhesion between the substrate composed of the aluminum alloy sheet and the resin coating film can be improved. In addition, the excellent corrosion resistance can be suppressed, and corrosive substances such as water and chloride can be prevented from being corroded under the coating film caused by the penetration of corrosive substances such as water and chloride, thereby preventing cracking of the coating film and peeling of the coating film. Further, the chemical conversion treatment methods such as the above-described chromizing treatment and the non-chromizing treatment may be of a reaction type or a coating type, and in the present invention, any method may be employed without any hindrance. -10- 201132799 Next, the above resin coating film contains a urethane resin, a citric acid gel, and an internal wax. The urethane resin constituting the above resin coating film is a one having a specific glass transition temperature of from 100 ° C to 150 ° C. When the glass transition temperature is 100 ° C or less, the elastic force is lowered, and when press forming or the like, it may be easily damaged, and the scratch resistance may be deteriorated. Further, when the glass transition temperature exceeds 150 ° C, the hardness of the resin is high, and the resin may be cracked during molding. The glass transition temperature of the urethane resin can be controlled by adjusting the degree of polymerization in the synthesis of the urethane resin, and the molecular structure of the polyol and the isocyanate of the urethane resin raw material. Further, the above phthalic acid gel is an amorphous vermiculite particle having a hydroxyl group bonded to its surface. The citric acid gel in the raw material state is a colloidal particle in which a negatively charged amorphous vermiculite particle is dispersed in water. On the surface of the particles, there are -SiOH groups, -OH- ions, and an electric double layer is formed by alkali ions, and the bismuth acid solution is in a stable state by repulsive repulsion between the particles. The decanoic acid gel of the above resin coating film is a sulphuric acid gel in the state of a sintered raw material. The above-mentioned sulphate expansion is carried out by using a primary particle diameter of 5 nm to 80 nm. Each particle in a dispersed state before aggregation is referred to as a primary particle, whereas the above primary particle diameter is the diameter of the primary particle. Further, the particles after aggregation are referred to as secondary particles, and the diameter of secondary particles refers to the secondary particle diameter. When the primary particle diameter of the above citrate gel is 5 nm or less, the electric resistance may become large, and the effect of improving conductivity may be small. On the other hand, when the secondary particle diameter of the above phthalic acid gel exceeds 80 nm, the adhesion between the chemical coating layer and the above-mentioned tree-11-11201132799 fat-coated film may be lowered to lower the fingerprint resistance. Each of the above diameters was subjected to drying of a citric acid gel, and the specific surface area was determined by a BET method (specific surface area measurement method), and the weight and density were inversely calculated. When the internal wax is a molecular weight of 1 000 to 16,000 and the molecular weight of the internal crucible is 1 000 or less, the resin coating film may be too soft, and the effect of preventing the formation of the crucible may be lowered. On the other hand, when the molecular weight exceeds 16,000, the manufacturing cost increases and the practicality decreases. Further, at the time of press working, the resin coating film is liable to be cracked and peeled off, and the press workability is deteriorated. Further, the above internal wax preferably has a primary particle diameter of 0.05 y m to 5 // m (the second item of the patent application). When the primary particle diameter of the internal crucible is 0.05 μm or less, it may be difficult to obtain an internal wax addition effect. On the other hand, when it exceeds 5/m, the wax may fall off during press forming of the above-mentioned conductive precoated aluminum alloy sheet. As a result, the durability against the solvent may be deteriorated, that is, the solvent resistance may be deteriorated. As the above internal wax, for example, lanolin, palm wax, polyethylene, or the like can be used. The above internal wax is preferably a polyethylene wax (the third item of the patent application range). The polyethylene wax has a high melting temperature and a spherical shape. In this case, the conductivity can be improved without impairing conductivity. Resin coating film 'dry weight of the resin coating film as a whole -12- 201132799 100 parts by weight of 'containing 10 to 99 parts by weight of the above urethane resin, 0.95 to 89.95 parts by weight of the above citric acid gum, and 〇.〇 5 to 5 parts by weight of the above internal wax. When the content of the urethane resin is 1 part by weight or less, it is difficult to form a homogeneous resin coating film, and the uranium resistance is lowered. On the other hand, when the amount exceeds 99 parts by weight, the addition amount of the shale gum is decreased, which may cause the conductivity of the resin coating film to decrease. The content of the urethane resin is preferably 50 to 80 parts by weight based on 100 parts by weight of the total dry weight of the resin coating film. The ruthenium phthalate gel y has only a small amount, and the effect of improving conductivity is found. In fact, in order to obtain the effect of sufficiently improving the conductivity, the content of the above-mentioned citric acid gel is preferably 〇 9.5 parts by weight or more, and 5 parts by weight, based on the dry weight of the entire resin coating film 丨 00 parts by weight. The above is better. Further, from the viewpoint of improving the conductivity, the adhesion between the chemical coating layer and the resin coating film may be lowered, the content of the above citric acid gel is 89.95 with respect to 100 parts by weight of the dry weight of the entire resin coating film. The parts below the weight are preferred. In addition, the content of the above-mentioned citric acid gel is 1 part by weight based on the dry weight of the entire resin coating film, and is 60, from the viewpoint of saturating the effect of improving the conductivity of the phthalic acid gel. It is preferably in the form of parts by weight or less, more preferably 40 parts by weight or less. Further, when the content of the internal wax is 5% by weight or less, it is difficult to obtain the ruthenium preventing effect at the time of press forming of the above-mentioned conductive pre-coated aluminum alloy sheet. Further, when the amount is more than 50 parts by weight, in the above-mentioned conductive pre-coated aluminum alloy sheet mass production and manufacturing process, when the conductive pre-coated aluminum alloy sheet or the like is wound up, the internal wax can be exuded and the productivity can be lowered. In addition, fingerprint resistance may be poor. The content of the internal ruthenium is preferably 5 to 40 parts by weight based on 100 parts by weight of the total dry weight of the resin coating film. Further, the film thickness τ of the resin coating film is 0.05/zm to 1.0/zm. When the film thickness T of the resin coating film exceeds 1.0 V m, the resin coating film has a large electric resistance and deteriorates conductivity, and the resin coating film is likely to be cracked during press forming of the conductive precoated aluminum alloy sheet. Peeling, etc., to reduce formability. Further, from the viewpoint of maintaining corrosion resistance, as described above, the film thickness T of the above resin coating film should be 0.05 / z m or more. Further, the ratio (T/Ra) of the film thickness T of the resin coating film to the surface roughness Ra of the substrate is 0.07 to 4_0. When the T/Ra is 0.07 or less, there is a problem that corrosion resistance, press formability, smear resistance, and fingerprint resistance are lowered. On the other hand, when the T/Ra exceeds 4.0, in addition to industrial production difficulties, bismuth is conductive. The problem of reduced sexuality. Further, the resin coating film may contain an additive such as a surfactant, insofar as it does not impair the effects of the present invention. When the surfactant is added, the conductivity of the resin coating film can be improved. However, when the amount is too large, the adhesion between the chemical coating layer and the resin coating film may be lowered. The resin coating film is formed, for example, by coating the resin coating material on the substrate on which the chemical coating layer is formed. For the coating method of the resin coating, for example, various methods such as a roll coating method, a roll coating method, a dip coating method, and a spray method can be employed. Further, the resin coating film coating material is applied and then cured to obtain a curing condition of the resin coating film, that is, a sintering condition, etc., and various conditions can be selected from -14 to 201132799. Further, in the conductive precoated aluminum alloy sheet, when the electric resistance of the surface portion of the 20 different portions of the resin coating film is measured by the needle electrode method, the electric resistance of the surface portion of 10 or more parts is 30 Ω or less. The average surface resistance of the surface portions of the above 20 parts is 10 Ω or less (item 4 of the patent application). At this time, conductivity can be utilized for various purposes. Further, in the above-described needle electrode method, a needle made of pure copper having a spherical tip having a diameter of 0.2 mm is placed on the surface of the resin coating film, and the needle is not subjected to a load which does not penetrate the resin coating film. A method of measuring the resistance 値 of the resin coating film between the exposed substrate and the needle by peeling off the film. Further, the above 20 different parts were placed from the end of the sample of the A4 plate to the inside of 30 mm, and were 20 parts which were evenly distributed without error. Among the resistances of the surface portions of the above 20 different portions, when the resistance of the surface portion of 10 or more parts exceeds 30 Ω, a portion having poor electromagnetic shielding properties may occur. Further, when the average resistance of the surface portions of the above 20 different portions exceeds 10 Ω, a portion having poor electromagnetic shielding properties may also occur. Further, the above-mentioned conductive pre-coated aluminum alloy sheet is suitably used for press-forming the conductive pre-coated aluminum alloy sheet, and is suitably used, for example, for a housing for an electric machine or a housing for an electronic device. In addition, the casing for an electric device or the casing for an electronic device is, for example, a casing of an electronic device such as a personal computer main body, a CD-ROM, a DVD, or a PDA, and a casing of an electric machine such as a television. The shutter portion of the memory media casing of FDD, MD, MO, etc., and various other items. [Examples] (Example 1) In the present example, examples and comparative examples of the conductive pre-coated aluminum alloy sheet of the present invention will be described. In this case, a composition of a chemical coating layer or a resin coating film is changed, and 18 kinds of conductive pre-coated aluminum alloy sheets (sample E 1 to sample E 1 8 ) as shown in Table 2 below are prepared as the present invention. Each of the five kinds of conductive pre-coated aluminum alloy sheets (sample C 1 to sample C 1 5 ) shown in Table 3 below was used as a comparative product, and various performance evaluation tests were carried out. The details will be described below. The conductive pre-coated aluminum alloy sheets 1 of the samples E1 to E18 are as shown in Fig. 1, and are a substrate 2 made of an aluminum alloy plate, and a chemical coating 3 formed on one or both sides of the substrate 2. And a resin coating film 4 formed on the chemical coating layer 3. The basic composition of the sample C1 to the sample C15, and the sample. ~ Sample e18 is the same. When preparing the sample E1 to the sample E18 and the sample C1 to the sample ci5, first, 'the 5052-H34 material having a thickness of 1.0 mm is prepared as a substrate made of an aluminum alloy plate. The substrate 2' is attached to the substrate 2'. The surface roughness R a varies within the range of ~1. The surface roughness Ra of the substrate 2 used for the production of each s material (g type material ε 1 to sample ε 1 8 and sample c 1 to sample C15) is shown in Tables 2 and 3. -16- 201132799 Next, a chemical coating treatment for forming the chemical coating layer 3 is performed on the substrate 2'. In Table 1, the four chemical conversion treatments (a to d) used in this example are used. The chemical conversion treatment a' was treated with a phosphate to form a reactive chromate coating having a chromium content of 2 〇mg/m2. Specifically, the chemical conversion treatment is carried out by a immersion method in which the substrate is immersed in a chemical conversion treatment liquid, and then dried in an environment of about 100 1 . The chemical conversion treatment b' was treated with zirconium to form a reactive non-chromate coating having a zirconium amount of 20 mg/m2. The treatment method is the same as the above-described chemical conversion treatment a. The chemical conversion treatment c' was applied by a coating type chromizing treatment to form a coating type chromate coating having a chromium content of 20 mg/m2. Specifically, after the degreasing treatment of the substrate is carried out, the treatment agent is applied by a roll coating method, and then dried in an environment of about 1 Torr. The chemical conversion treatment d' was treated with a coating type zirconium to form a coating type non-chromate coating layer having a chromium content of 20 mg/m2. The processing method is the same as the above-described chemical conversion processing d. (Table 1) Mark Chemically etched species conditions a Reaction type chromate phosphate treatment chromium content: 20 mg/m2 b Reaction type non-chromate zirconium treated zirconium amount: 20 mg/m2 c coated chromate coating Type chromizing treatment chromium content: 20 mg/m2 d Coating type non-chromic acid coating type zirconium treatment Sales volume: 20 mg/m2 Next, on the above chemical coating layer 3, a resin coating film 4 was formed. The coating method of the resin coating film coating material has various methods as described above, and in this embodiment, it is carried out by a roll coating method, and thereafter, the substrate surface temperature is maintained at about -17 to 201132799 230 ° C. The sintering treatment was carried out for 40 seconds and hardened to form a resin coating film having the composition and film thickness T as shown in Tables 2 and 3. The coating material for a resin coating film is a coating containing a urethane resin having a solid content as shown in Tables 2 and 3, an internal bismuth, and a bismuth phthalate gel, and is isopropyl alcohol, ethanol, or ethylene glycol. The butyl ether is produced as a solvent. The urethane resin is a glass transition temperature of 70 ° C to 17 (TC, tensile ratio 1*70 to 25 %, and a breaking stress of 4 MPa or more. The urethane resin used in the production of each sample) The glass transition temperature and blending amount are shown in Table 2 and Table 3. In addition, the internal wax is a polyethylene wax having a primary particle diameter of 0.01 to 6 μm and a molecular weight of 00 to 20,000. The internal wax used in the preparation of each sample is The secondary particle diameter, molecular weight, and blending amount are shown in Tables 2 and 3. In addition, the tannic acid gel is a primary particle diameter of 3 to 100 nm, and the primary particle diameter and blending of the tannic acid gel used in the preparation of each sample. The amounts are shown in Tables 2 and 3. In addition, the contents of the urethane resin, the citric acid gel, and the internal wax of 'Tables 2 and 3' are 100 weights relative to the total weight of the resin film after drying. The amount (parts by weight). -18- 201132799 (s®
膜厚τ/ 表面粗細 度Ra ΙΛ 〇 in ο ιη ο LO Ο LO 〇 in o in o in 〇 to o in o in o lO o in o to o LO o 0.125 | in to o 基板表 面粗細 度Ra (Atm) _I 〇 呀· ο 呀 Ο Ο 寸 d o 寸· o o 寸 o 寸 〇 却 o 寸 o 守 o 〇 呀 o o 寸 d 寸 o 樹脂塗膜 膜厚τ (μ m) _I 〇 03 Ο CM c> CQ ο o CvJ o CQ o oa o CM 〇 o CNJ o CNJ o ca o (N d o 0.05 CSJ c5 樹脂塗膜用塗料成份 內部蠟 含有量 (重量份） to ΙΛ in in in in in in o g in in in LO in LO l〇 in 分子量 2000 2000 2000 2000 2000 4000 4000 10000 4000 4000 1000 2000 2000 16000 2000 2000 2000 10000 一次粒子徑 (μηι) 〇 Ο Ο Ο o c5 o 0.05 〇 o 〇 CM 〇 00 o 寸 (N 〇 CM 〇 CD 矽酸膠 含有量 (重量份） 〇 ο Ο CO 00 § s 〇 o o O, o o o 〇 〇 〇 in —次粒子徑 (nm) 另 LO Ο 另 另 另 沄 另 o CO 另 另 氨基甲酸樹脂 含有量 (重量份） LO 00 ιη οο to 00 οα 0¾ 00 ιο to § ΙΟ 89.5 〇 in 00 LO 00 in 00 in 00 LO 00 LO 00 in 00 o 00 玻璃轉移溫度 (°C) 〇 〇 CO (Μ CO CM Η CO C^J r—Η CO CJ s s CO CO CO CSJ CO CJ g t-H s s s CO •丨1嘁 CO CO (N 化學 塗層 化成 處理 cd JO o o Ό cd ed Xi J3 cd o TD -Ό Ί3 試料 d Z ca CO m ω in ω CD m 00 m cn CU | E10 | Ell | E12 | E13 | E14 | E15 | E16 I E17 | E18 I -19- 201132799 (i 膜厚τ 7表面 粗細度 Ra m C) to ό 0.05 0.05 I 0.05 I 0.05 | CO 寸 o 0-05 ΙΛ 〇· ΙΟ Ο LO 〇 1C o 1ί H a ¥ 粗細度 Ra (μπι) 〇 寸 ο o 寸 o o 寸 d o 0.05 0.05 | c> 却· o 寸 ο o 守 o 樹脂塗膜 膜厚Τ (μπί) 〇 Cvj Ο 0.02 0.02 0.02 0.02 ca CNJ o o CNJ o 0.02 〇· ο CM o CNJ o 樹脂塗膜用塗料成份 內部蠟 含有量 (重量份） m in m LO in in in in UD in m 1 in in 分子量 2000 2000 4000 4000 4000 4000 10000 4000 4000 10000 4000 O s 20000 1 4000 -次粒子徑 (μτη) CNJ 〇 C> CM 〇 CNJ o 〇 o 0.05 CM· 〇 cvi o CSJ o 0.01 esi o CN| ο 1 CM o 矽酸膠 含有量 (重量份） 〇 Ο τ-Η o o 1 o in w < ^ to in lO in in m m in 一次粒子徑 (nm) 另 另 CO o ψ H 1 异 另 另 氨基甲酸樹脂 含有量 (重量份） in 00 in 〇〇 LO OO LO OO m 〇> ιο C4 o g g § g § S in OO LO 玻璃轉移溫度 (°C) ο ο CO CV3 CO cq CO CM CO CNJ CO CVJ CO eg CO CVJ CO cvj CO CS3 CO CNJ ”·Η g s S 化學 塗層 化成 處理 cd J3 〇 TD o o Ό o cd Ό o JD cd Xi 試料 No. U u CO U 寸 U in U CO u 卜 U 00 U ¢3¾ D | cio | cn 1 C12 C13 | C14 | C15 -20- 201132799 由表2可以得知，試料El〜試料E18，係樹脂塗膜含有 玻璃轉移溫度1〇〇〜15 0°C之氨基甲酸酯樹脂、一次粒子徑 5nm〜80 nm之矽酸膠、及分子量1000〜16000之內部蠟， 乾燥重量100重量份當中，含有10〜99重量份之上述氨基 甲酸酯樹脂、0.95〜8 9.95重量份之上述矽酸膠、及〇.〇5〜 5 0重量份之上述內部蠟，上述樹脂塗膜之膜厚T爲〇.〇5 // m 〜1.0// m，上述基板之表面粗細度Ra爲o.i" m〜0.8// m， 上述樹脂塗膜之膜厚T與上述基板之表面粗細度Ra之比（ T/Ra)爲0.07〜4.0之範圍內之導電性預敷鋁合金板。另― 方面，試料C1〜試料CI5，係在該等範圍外之導電性預敷 銘合金板。 其次’針對表2及表3所示之合計33種試料（試料E1〜 試料E18及試料C1〜試料C15)，實施下述各種評估試驗 等。其結果如表4及表5所示。 <導電性> 導電性，係利用針狀電極法，於從A4板試料之端部之 3 0mm內側’測量無誤差而平均分配之2〇個部位之表面部 位的電阻値測量來進行評估。針狀電極法，係將具有 Φ 0.2mm之球面狀針尖之純銅製針，置於樹脂塗膜表面， 對針賦予針尖不會貫通樹脂塗膜之荷重，於該狀態下，導 通脫膜而露出之基板與針之間，來測量針尖接觸之部分之 樹脂塗膜之電阻値的方法。本例時，對針賦予之荷重一律 以1 〇 g來貫施。評估爲3點以上時’爲合格，2點以下時， -21 - 201132799 爲不合格。 (評估基準） 5點：測量到之電阻値爲3 0Ω以下之比例爲1 00%時。 4點：測ϋ到之電阻値爲30Ω以下之比例爲80%以上、 1 0 0 %以下時。 3點：測量到之電阻値爲30Ω以下之比例爲50%以上、 8 0%以下時。 2點：測量到之電阻値爲30Ω以下之比例爲30%以上、 5 0 %以下時。 1點：測量到之電阻値爲30Ω以下之比例爲10%以上、 3 〇 %以下時。 〇點：測量到之電阻値爲30Ω以下之比例爲1〇%以下時 <壓製加工性> 壓製加工性，如第2圖所示，對各試料50，分別重複 進行彎曲加工’以彎曲加工部之樹脂塗膜之塗膜龜裂被消 除之彎曲次數來進行評估。 評估點分成5段’彎曲次數1次時爲5點，彎曲次數2次 時爲4點’彎曲次數3次時爲3點，彎曲次數4次時爲2點， ®曲次數5次時爲1點。評估點爲3點以上時，爲合格，評 估點2點以下時，爲不合格。 -22- 201132799 <耐蝕性> 耐蝕性，從試料之樹脂塗膜表面，以切刀進行交叉滑 切，依據〗ISK54〇0規定之鹽水噴霧試驗，實施720小時之 噴霧後，觀察試料之外觀。 評估點分成5段，外觀上無變化時爲5點，〇 . 5 mm以下 之塗膜膨脹時爲4點，0.5mm以上、1 mm以下之塗膜膨脹時 爲3點’ 1mm以上、3mm以下之塗膜膨脹時爲2點，3mm以 上之塗膜膨脹時爲1點。評估點爲3點以上時，爲合格，評 估點爲2點以下時，爲不合格。 <耐瑕疵性> 耐瑕疵性，係以第3圖所示之鮑登試驗來實施。亦即 ’使何重1000g之直徑1M央时之鋼球，於載置於取樣台上 之試料之樹脂塗膜表面滑動，以發生塗膜破損時之滑動次 數來評估。 評估點分成5段’滑動次數爲100次以上時爲5點，滑 動次數爲75次以上、1〇〇次以下時爲4點，滑動次數爲5〇次 以上、75次以下時爲3點，滑動次數爲25次以上、5〇次以 下時爲2點’滑動次數爲25次以下時爲1點。評估點爲3點 以上時’爲合格’評估點爲2點以下時，爲不合格。 <耐指紋性> 耐指紋性，將各試料切割成5〇mmx5〇mm之面積，於其 一半之面積塗佈1 〇mg/dm2量之凡士林，將整體浸清於酒精 -23- 201132799 中1次再取出，其後，以目視觀察凡士林之殘存面積。 評估點分成5段，無殘存時爲5點，1/4殘存時爲4點， 1/2殘存時爲2點，3/4殘存時爲2點，全面殘存時爲丨點。評 估點爲3點以上時，爲合格，評估點爲2點以下時，爲不合 格。 <耐溶劑性> 耐溶劑性，以5層廢布包覆1磅鐵錘，浸泡三氯乙烯， 置於各試料之樹脂塗膜表面進行50mm長度之重複滑動， 觀察第幾次塗膜表面溶解並變色。 評估點分成5段，10次以上時爲5點，7次以上、10次 以下時爲4點，5次以上、7次以下時爲3點，2次以上、5次 以下時爲2點，1次時爲！點。評估點爲3點以上時，爲合格 ’評估點爲2點以下時，爲不合格。 -24 - 201132799 (表4) 試料 No. 評估點 導電性 壓製加工性 耐蝕性 耐瑕疵性 耐指紋性 耐溶劑性 El 4 3 4 5 4 4 E2 3 4 4 5 4 4 E3 5 5 5 5 4 3 E4 3 4 4 5 3 4 E5 4 3 4 4 4 5 E6 5 5 4 5 4 3 E7 5 5 4 5 4 5 E8 4 5 5 5 4 5 E9 4 3 5 5 4 4 E10 5 5 5 5 5 4 Ell 5 5 5 5 5 4 E12 4 4 4 5 3 5 E13 4 5 4 5 4 5 E14 4 5 4 5 5 3 E15 4 5 4 5 4 3 E16 5 4 3 3 3 5 E17 3 4 5 5 4 5 E18 3 5 3 4 5 2 -25- 201132799 (表5) 試料 No. 評估點 導電性 壓製加工性 耐蝕性 耐瑕疵性 耐指紋性 耐溶劑性 Cl 4 4 4 2 4 4 C2 5 1 4 2 4 4 C3 2 2 1 3 1 5 C4 5 2 2 1 2 5 C5 2 4 2 5 1 5 C6 4 2 2 4 4 5 C7 1 2 5 2 3 4 C8 1 2 1 1 2 3 C9 1 2 1 1 2 4 CIO 4 2 2 1 4 3 Cll 5 1 1 1 4 4 C12 4 2 4 1 5 4 C13 3 2 4 4 3 4 C14 5 1 5 1 3 4 C15 3 5 4 5 1 4 由表4可以得知，本發明品之試料E丨〜e 1 8，於導電性 '壓製加工性 '耐腐蝕性、耐瑕疵性、及耐指紋性之評估 項目’呈現優良特性《此外，未標示於表中，試料E丨〜試 料E1 8 ’導電性評估時，上述之20個部位之表面部位的電 阻平均値爲1 0Ω以下，呈現非常優良之導電性。 此外’試料E 1〜試料E 1 7，耐溶劑性亦優良。另—方 面’採用一次粒子徑較大之內部蠟來製作之試料e18，耐 溶劑性有若干問題。所以，從提高耐溶劑性之觀點而言， -26- 201132799 以使用一次粒子徑5 // m以下之內部蠟爲佳。 另一方面，由表5可以得知，比較品之試料C 1及試料 C2，因爲氨基甲酸酯樹脂之玻璃轉移溫度偏離本發明之範 圍，耐瑕疵性較差。 試料C 3〜C 5，樹脂塗膜之膜厚太小，耐指紋性較差。 此外，耐蝕性亦應相同。此外，試料C3，矽酸膠之一次粒 子徑太小，導電性較差。此外，試料C 4，矽酸膠之一次粒 子徑太大，耐指紋性較差。此外，試料C 5，未含有矽酸膠 ，導電性較差。 此外，試料C6，樹脂塗膜之膜厚太小，耐蝕性較差。 試料C7，樹脂塗膜之膜厚太大，導電性及壓製加工性 較差。 此外’試料8及試料C9，基板之表面粗細度太小，導 電性較差。 此外’試料C 1 0，基板之表面粗細度太大，耐蝕性、 壓製加工性、及耐瑕疵性較差。 Μ料· c 11 ’樹脂塗膜之膜厚太小，耐蝕性較差。此外 ’壓製加工性及耐瑕疵性較差。 Μ料· C 1 2 ’內部蠟之分子量太小，耐瑕疵性較差。此 外’壓製加工性較差。 言式料C 1 3 ’內部蠟之分子量太大，壓製加工性較差。 此外’試料C 1 4，未含有內部蠟，耐瑕疵性及壓製加 工性較差。 試料C 1 5 ’內部蠟太多，耐指紋性較差。 -27- 201132799 如以上所示’由本例可以得知，本發明之實施例之預 敷鋁合金板（試料E1〜試料E18)，具有優良導電性，而 且’耐瑕疵性及耐指紋性優良，此外，壓製加工性及耐蝕 性優良。該導電性預敷鋁合金板，例如，特別適合使用於 電氣機器用框體或電子機器用框體。 【圖式簡單說明】 第1圖係實施例之導電性預敷鋁合金板的構造說明圖 〇 第2圖係實施例之壓製加工性之評估方法說明圖。 第3圖係實施例之耐瑕疵性之評估方法之鮑登（Bowden )試驗方法說明圖。 【主要元件符號說明】 1 :導電性預敷鋁合金板 2 :基板 3 :化學塗層 4 :樹脂塗膜 -28-Film thickness τ / surface thickness Ra ΙΛ 〇in ο ιη ο LO Ο LO 〇in o in o in 〇to o in o in o lO o in o to o LO o 0.125 | in to o Substrate surface roughness Ra (Atm ) _I 〇 · ο Ο Ο 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸 寸o CvJ o CQ o oa o CM 〇o CNJ o CNJ o ca o (N do 0.05 CSJ c5 Resin coating composition internal wax content (parts by weight) to ΙΛ in in in in in og in in LO in LO l〇in Molecular weight 2000 2000 2000 2000 2000 4000 4000 10000 4000 4000 1000 2000 2000 16000 2000 2000 2000 10000 Primary particle diameter (μηι) 〇Ο Ο Ο o c5 o 0.05 〇o 〇CM 〇00 o inch (N 〇CM 〇 CD citrate content (parts by weight) 〇ο Ο CO 00 § s 〇oo O, ooo 〇〇〇in — secondary particle diameter (nm) Another LO Ο another 沄 another o CO urethane content (parts by weight) LO 00 ιη οο to 00 οα 03⁄4 00 ιο to § ΙΟ 89.5 〇in 00 LO 00 in 00 in 00 LO 0 0 LO 00 in 00 o 00 Glass transition temperature (°C) 〇〇CO (Μ CO CM Η CO C^J r—Η CO CJ ss CO CO CO CSJ CO CJ g tH sss CO •丨1嘁CO CO (N Chemical coating formation treatment cd JO oo Ό cd ed Xi J3 cd o TD -Ό Ί3 sample d Z ca CO m ω in ω CD m 00 m cn CU | E10 | Ell | E12 | E13 | E14 | E15 | E16 I E17 E18 I -19- 201132799 (i film thickness τ 7 surface roughness Ra m C) to ό 0.05 0.05 I 0.05 I 0.05 | CO 寸 o 0-05 ΙΛ 〇· ΙΟ Ο LO 〇1C o 1ί H a ¥ Thickness Ra (μπι) ο inch ο o inch oo inch do 0.05 0.05 | c> but · o inch ο o 守o resin coating film thickness Τ (μπί) 〇Cvj Ο 0.02 0.02 0.02 0.02 ca CNJ oo CNJ o 0.02 〇· ο CM o CNJ o Resin coating coating composition Internal wax content (parts by weight) m in m LO in in in UD in m 1 in in Molecular weight 2000 2000 4000 4000 4000 4000 10000 4000 4000 10000 4000 O s 20000 1 4000 - Secondary particle diameter (μτη) CNJ 〇C> CM 〇CNJ o 〇o 0.05 CM· 〇cvi o CSJ o 0.01 esi o CN| ο 1 CM o 矽 acid gel content (parts by weight) τ τ-Η oo 1 o in w < ^ to in lO in in mm in primary particle diameter (nm) Another CO o ψ H 1 different urethane resin content (parts by weight) in 00 in 〇〇LO OO LO OO m 〇> ιο C4 ogg § g § S in OO LO Glass transition temperature (°C) ο ο CO CV3 CO cq CO CM CO CNJ CO CVJ CO eg CO CVJ CO cvj CO CS3 CO CNJ ”·Η gs S chemical coating formation treatment cd J3 〇TD oo Ό o cd Ό o JD cd Xi sample No. U u CO U inch U in U CO u U 00 U ¢33⁄4 D | cio | cn 1 C12 C13 | C14 | C15 -20- 201132799 It can be seen from Table 2 that the sample El to sample E18 is a resin coating film containing a urethane resin having a glass transition temperature of 1 〇〇 to 15 ° C and a tantalum having a primary particle diameter of 5 nm to 80 nm. a rubber and an internal wax having a molecular weight of 1000 to 16,000, and 100 parts by weight of the dry weight, and 10 to 99 parts by weight of the above urethane resin, 0.95 to 8.95 parts by weight of the above-mentioned citric acid gel, and 〇.〇5~ 50 parts by weight of the internal wax, the film thickness T of the resin coating film is 〇.〇5 // m 〜1.0//m, and the surface roughness Ra of the substrate is O.i" m~0.8//m, a conductive pre-coated aluminum alloy plate having a ratio (T/Ra) of a film thickness T of the resin coating film to a surface roughness Ra of the substrate of from 0.07 to 4.0. On the other hand, the sample C1 to the sample CI5 are electrically conductive pre-applied alloy sheets outside these ranges. Then, the following 33 kinds of samples (sample E1 to sample E18 and sample C1 to sample C15) shown in Tables 2 and 3 were subjected to the following various evaluation tests. The results are shown in Tables 4 and 5. <Electrical Conductivity> The conductivity was evaluated by measuring the electric resistance 表面 of the surface portion of the two portions which were equally distributed without error and from the inside of the end of the A4 plate sample by the needle electrode method. . In the needle electrode method, a pure copper needle having a spherical needle tip of Φ 0.2 mm is placed on the surface of the resin coating film, and the needle is not allowed to pass through the resin coating film, and in this state, the film is exposed and exposed. A method of measuring the resistance 値 of the resin coating film between the substrate and the needle to measure the portion of the needle contact. In this case, the load applied to the needle is uniformly applied at 1 〇 g. When the evaluation is 3 or more points, it is qualified, and when it is 2 or less, -21 - 201132799 is unqualified. (Evaluation Criteria) 5 points: When the measured resistance 値 is 30 Ω or less, the ratio is 100%. 4 points: When the ratio of the resistance 値 to 30 Ω or less is 80% or more and 100% or less. 3 points: When the measured resistance 値 is 30 Ω or less, the ratio is 50% or more and 80% or less. 2 points: When the measured resistance 値 is 30 Ω or less, the ratio is 30% or more and 50% or less. 1 point: When the measured resistance 値 is 30 Ω or less, the ratio is 10% or more and 3 〇 % or less. 〇 : : : 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量 测量The number of times the coating crack of the resin coating film of the processed portion was eliminated was evaluated. The evaluation point is divided into 5 segments, which is 5 points when the bending frequency is 1 time, 4 points when the bending times are 2 times, 3 points when the bending times are 3 times, 2 points when the bending times are 4 times, and 1 when the number of bending times is 5 times. point. When the evaluation point is 3 or more points, it is acceptable, and when the evaluation point is 2 points or less, it is unqualified. -22- 201132799 <Corrosion resistance> Corrosion resistance, from the surface of the resin coating film of the sample, cross-slip cutting with a cutter, according to the salt spray test specified in ISK54〇0, after performing a 720-hour spray, observe the sample Exterior. The evaluation point is divided into five sections, and the appearance is 5 points when there is no change in appearance. When the coating film of 5 mm or less is expanded, it is 4 points, and when the coating film of 0.5 mm or more and 1 mm or less is expanded, it is 3 points '1 mm or more and 3 mm or less. When the coating film is expanded, it is 2 points, and when the coating film of 3 mm or more is expanded, it is 1 point. When the evaluation point is 3 or more points, it is acceptable, and when the evaluation point is 2 points or less, it is unqualified. <Hardness resistance> The scratch resistance was carried out by the Bowden test shown in Fig. 3. That is, the steel ball of the diameter of 1 M in a 1000 g was slid on the surface of the resin coating film of the sample placed on the sampling table, and was evaluated by the number of sliding times when the coating film was broken. The evaluation point is divided into 5 segments. When the number of slides is 100 or more, it is 5 points. When the number of slides is 75 or more, the number of slides is 4 or less, and when the number of slides is 5 or more, the number of slides is 5 or more, and when it is 75 or less, it is 3 points. When the number of slides is 25 or more and 5 or less, it is 2 points. When the number of slides is 25 or less, it is 1 point. When the evaluation point is 3 points or more, it is unqualified when the evaluation point is 2 points or less. <Fingerprint resistance> The fingerprint resistance was cut into 5 〇mm x 5 〇mm area, and the amount of 〇mg/dm2 of Vaseline was applied to half of the area, and the whole was immersed in alcohol-23-201132799 It was taken out once in the middle, and thereafter, the remaining area of Vaseline was visually observed. The evaluation point is divided into 5 segments, 5 points when there is no residual, 4 points when there is 1/4 remaining, 2 points when 1/2 remains, 2 points when 3/4 remains, and 丨 when there is residual. When the evaluation point is 3 or more points, it is acceptable, and when the evaluation point is 2 points or less, it is unqualified. <Solvent resistance> Solvent resistance, 1 lb. of iron hammer was coated with 5 layers of waste cloth, and trichloroethylene was immersed, and the surface of the resin coating film of each sample was repeatedly slid over a length of 50 mm to observe the first few coating films. The surface dissolves and discolors. The evaluation point is divided into 5 segments, 5 points for 10 times or more, 4 points for 7 times or more and 10 times or less, 3 points for 5 or more and 7 or less, and 2 points for 2 or more and 5 or less. 1 time! point. When the evaluation point is 3 or more points, it is acceptable. When the evaluation point is 2 points or less, it is unqualified. -24 - 201132799 (Table 4) Sample No. Evaluation point Conductive press workability Corrosion resistance 瑕疵 resistance Fingerprint resistance Solvent resistance El 4 3 4 5 4 4 E2 3 4 4 5 4 4 E3 5 5 5 5 4 3 E4 3 4 4 5 3 4 E5 4 3 4 4 4 5 E6 5 5 4 5 4 3 E7 5 5 4 5 4 5 E8 4 5 5 5 4 5 E9 4 3 5 5 4 4 E10 5 5 5 5 5 4 Ell 5 5 5 5 5 4 E12 4 4 4 5 3 5 E13 4 5 4 5 4 5 E14 4 5 4 5 5 3 E15 4 5 4 5 4 3 E16 5 4 3 3 3 5 E17 3 4 5 5 4 5 E18 3 5 3 4 5 2 -25- 201132799 (Table 5) Sample No. Evaluation point Conductive pressing processability Corrosion resistance 瑕疵 resistance Fingerprint resistance Solvent resistance Cl 4 4 4 2 4 4 C2 5 1 4 2 4 4 C3 2 2 1 3 1 5 C4 5 2 2 1 2 5 C5 2 4 2 5 1 5 C6 4 2 2 4 4 5 C7 1 2 5 2 3 4 C8 1 2 1 1 2 3 C9 1 2 1 1 2 4 CIO 4 2 2 1 4 3 Cll 5 1 1 1 4 4 C12 4 2 4 1 5 4 C13 3 2 4 4 3 4 C14 5 1 5 1 3 4 C15 3 5 4 5 1 4 As can be seen from Table 4, the present invention The sample E丨~e 1 8 showed excellent characteristics in the evaluation item of the conductive 'pressing workability' corrosion resistance, stagnation resistance, and fingerprint resistance. In addition, it is not shown in the table, and the sample E丨~ When the material E1 8 'evaluation conductive, electrical surface portion 20 of the barrier site of an average of 1 0Ω Zhi or less, exhibit very excellent the conductivity. Further, the sample E 1 to the sample E 1 7 were excellent in solvent resistance. On the other hand, the sample e18 prepared by using an internal wax having a large particle diameter has a problem in solvent resistance. Therefore, from the viewpoint of improving solvent resistance, -26-201132799 preferably uses an internal wax having a primary particle diameter of 5 // m or less. On the other hand, as can be seen from Table 5, the sample C 1 of the comparative product and the sample C2 have poor glass resistance because the glass transition temperature of the urethane resin deviated from the range of the present invention. In the sample C 3 to C 5 , the film thickness of the resin coating film was too small, and the fingerprint resistance was poor. In addition, the corrosion resistance should be the same. In addition, in the sample C3, the primary particle diameter of the citrate gel was too small and the conductivity was poor. In addition, sample C 4, citrate gel has a large particle diameter and poor fingerprint resistance. Further, the sample C 5 did not contain citric acid gum and was inferior in electrical conductivity. Further, in the sample C6, the film thickness of the resin coating film was too small, and the corrosion resistance was inferior. In the sample C7, the film thickness of the resin coating film was too large, and the electrical conductivity and press workability were inferior. Further, in the sample 8 and the sample C9, the surface roughness of the substrate was too small, and the conductivity was poor. Further, in the sample C 1 0, the surface roughness of the substrate was too large, and the corrosion resistance, press workability, and scratch resistance were inferior. ··· c 11 ' The film thickness of the resin coating film is too small and the corrosion resistance is poor. In addition, 'pressing workability and smash resistance are poor. Dip. · C 1 2 'The internal wax has a too small molecular weight and is poorly resistant to cockroaches. In addition, the press workability is poor. The molecular weight of the internal material C 1 3 'the internal wax is too large, and the press workability is poor. Further, the sample C 14 did not contain an internal wax, and was inferior in resistance to enthalpy and press workability. The sample C 1 5 ' has too much internal wax and is poor in fingerprint resistance. -27- 201132799 As shown above, it can be seen from the present example that the pre-applied aluminum alloy sheet (sample E1 to sample E18) of the embodiment of the present invention has excellent conductivity and is excellent in 'scratch resistance and fingerprint resistance. Further, press workability and corrosion resistance are excellent. The conductive pre-coated aluminum alloy sheet is particularly preferably used for a frame for an electric machine or a frame for an electronic device. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a structural explanatory view of an electrically conductive precoated aluminum alloy sheet according to an embodiment. Fig. 2 is an explanatory diagram of an evaluation method for press workability of an embodiment. Fig. 3 is an explanatory diagram of a Bowden test method for evaluating the tamper resistance of the examples. [Main component symbol description] 1 : Conductive pre-coated aluminum alloy plate 2 : Substrate 3 : Chemical coating 4 : Resin coating film -28-