TWI393755B - 粉體塗裝之塗料及方法 - Google Patents

粉體塗裝之塗料及方法 Download PDF

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TWI393755B
TWI393755B TW097146218A TW97146218A TWI393755B TW I393755 B TWI393755 B TW I393755B TW 097146218 A TW097146218 A TW 097146218A TW 97146218 A TW97146218 A TW 97146218A TW I393755 B TWI393755 B TW I393755B
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Gan Lin Hwang
ting yao Su
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Ind Tech Res Inst
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Description

粉體塗裝之塗料及方法
本發明係關於奈米碳球，更特別關於含有奈米碳球之塗料及塗佈方法。
粉體塗裝為一種廣為業界應用的乾式塗裝技術，其原理為摩擦粉體塗料，利用靜電將粉體噴灑至帶有相反電荷的金屬物件上。為了改善塗裝品質，塗料之樹脂基體會添加少量添加物如1至2重量百分比之奈米碳管、碳黑、金屬粉末、氮化物如氮化硼或氮化鋁、或陶磁粉末。然而如此少量之添加物均無法達到靜電消散的導電度範圍，且樹脂基體導熱不佳，塗裝後的金屬物件更不易自然散熱、靜電消散、電磁屏蔽、自由基防護、或防蝕。綜上所述，目前亟需新的塗料組成改善粉體塗裝後的塗層表現。
本發明提供一種粉體塗裝之塗料，包括90至99.9重量份之樹脂基體；以及0.1至10重量份之奈米碳球均勻分散於該樹脂基體中。
本發明更提供一種粉體塗裝之方法，包括提供金屬物件，並施加電壓至金屬物件；摩擦上述之粉體塗裝之塗料，使其帶有電荷，且電荷與施加至金屬物件之電壓的電性相反；以噴嘴將塗料噴灑至金屬物件形成塗層。
為改善習知粉體塗裝形成之塗層性質不佳的問題，本 發明採用奈米碳球作為塗料添加劑。奈米碳球是由多層石墨層以球中球的結構所組成的多面體碳簇，其直徑約3~60nm。奈米碳球已應用在許多領域如藥物(醫藥級活性碳)；光、熱吸收與電磁波遮蔽；有機發光材料或太陽能接收器；觸媒、感測器；鋰電池內之碳電極；具熱導、特殊電性之奈米複材；印刷用奈米碳粉等處。奈米碳球可大致分類為中空奈米碳球及填充金屬之奈米碳球，前者之中心為空洞，後者之中心則進一步填充有純金屬、金屬氧化物、金屬碳化物、金屬硫化物、金屬氮化物、金屬硼化物、或合金。上述兩種奈米碳球之製備方式請見中華民國專利公告第197772及251580號。此外，奈米碳球之外殼可為純碳，亦可含有其他掺雜物如氮、磷、硼以增加奈米碳球之導電性。
適用於本發明塗料之基體為樹脂基體為包括聚甲基丙烯酸甲酯、聚氨酯、聚四氟乙烯、環氧樹脂、或其他樹脂。在本發明一實施例中，樹脂基體與奈米碳球之重量比介於99.9：0.1至90：10之間。可以理解的是，若奈米碳球之比例低於上述範圍，將無法有效改善粉體塗裝後之塗層的物理性質。但若奈米碳球之比例高於上述範圍，則會影響粉體塗裝的靜電製程，進而影響粉體塗裝後之塗層均勻性。另一方面，可以接枝等方式改質奈米碳球表面，使其具有不同的官能基以進一步與樹脂基體交聯。關於改質奈米碳球表面的具體方式請見美國專利第7,217,748號。
雖然本發明之添加劑主要為奈米碳球，但可進一步包 含填充粒子如奈米碳管、碳黑、金屬粉末、氮化硼、氮化鋁、或陶磁粉末等習知添加劑。在本發明一實施例中，填充粒子與奈米碳球之間互相分散可以避免劣化塗層性質。
本發明以上述塗料進行粉體塗裝的方式與一般常見之粉體塗裝類似。首先，施加一電壓至金屬物件如基板、鰭片、或外殼。此金屬物件可作為散熱元件，如燈罩、電腦主機外殼、或任何運轉時產生大量餘熱的元件。接著以摩擦方式使粉體塗料產生靜電，且靜電電性與施加至金屬物件之電壓相反。最後自噴嘴將靜電化之粉體塗料噴灑至金屬物件上，使金屬物件表面形成均勻的塗層。本發明並不限定採用何種粉體塗裝參數如摩擦條件、噴嘴形式、或塗裝時間，本技藝人士自可依金屬物件大小及所需塗層厚度調整該些參數。另一方面，即使採用相同的粉體塗裝參數，本發明以奈米碳球作為添加劑所形成的塗層，其膜厚均勻性、自然散熱性、靜電消散、電磁屏蔽、自由基防護、或防蝕等性質上均較含有習知添加劑之塗層優異。
為了讓本發明之上述和其他目的、特徵、和優點能更明顯易懂，下文特舉數實施例作詳細說明如下：
【實施例】 實施例1
取1kg之奈米碳球(製備方式見中華民國專利公告第197772號)與50Kg之甲基丙烯酸甲酯，共聚合、粉碎、造粒，均勻混合後以粉體塗裝機噴塗至鋁質散熱鰭片形成塗層於其上將市售樹脂(甲基丙烯酸甲酯)與改質後的奈米碳 球藉高速機械研磨混合攪拌、再經熱處理讓粉體與樹脂間產生聚合作用、此時粉體團聚凝固，再粉碎研磨分散、重複2次，最後研磨成均勻細緻粉體。以過篩去除太大顆粒(100μm以上)，收集時再以吹風方式將太小粒徑(0.5μm以下)粉體大約去除，以維持塗裝外貌美觀。此塗層之外觀為黑色，導熱度為約0.8w/mK，電阻值為5.5*106 Ω/cm2 ，輻射發射度大於98%，而鉛筆硬度>6H。將其置於烘箱後加熱至90℃，取出後靜置於室溫量測溫度對時間曲線如第1圖。
比較實施例1
取實施例1所述之鋁質散熱鰭片(未塗覆任何塗料)直接置於烘箱後加熱至90℃，取出後靜置於室溫量測溫度對時間曲線如第1圖。由第1圖之比較可知，具有奈米碳球之塗層的散熱鰭片其降溫速度較快，顯示塗層具輻射冷卻效果。
實施例2
取實施例1之塗料噴塗於LED檯燈10之燈罩11上，燈罩11之設計為散熱鰭片如第2圖所示，塗層之膜厚約60~100μm。將5瓦之LED燈13開啟約20分鐘後，燈罩溫度為50℃，且亮度為2950 Lux(Im/m3 )。
比較實施例2
與實施例2之檯燈相同，差別在於燈罩11不具有塗層於其上。將5瓦之LED燈13開啟約20分鐘後，燈罩溫度為65℃，亮度為1780 Lux(Im/m3 )。此外，配合上述不具有 塗層之燈罩11的LED燈13其因過熱而開始閃爍。與實施例2相較，不具有塗層的燈罩溫度較高，連帶降低LED的壽命。此外，過高的燈罩溫度也降低了LED燈13的發光效能如亮度。
雖然本發明已以數個實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作任意之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。
10‧‧‧檯燈
11‧‧‧燈罩
13‧‧‧LED燈
第1圖係本發明實施例中不同實施例之散熱鰭片的散熱曲線；以及第2圖係本發明實施例中檯燈之示意圖。

Claims (10)

  1. 一種粉體塗裝之塗料，包括：90至99.9重量份之樹脂基體；以及0.1至10重量份之奈米碳球均勻分散於該樹脂基體中，其中該粉體塗裝之塗料為粉體。
  2. 如申請專利範圍第1項所述之粉體塗裝之塗料，其中該樹脂基體包括聚甲基丙烯酸甲酯、聚氨酯、聚四氟乙烯、或環氧樹脂。
  3. 如申請專利範圍第1項所述之粉體塗裝之塗料，其中該奈米碳球包括中空奈米碳球或填充金屬奈米碳球。
  4. 如申請專利範圍第3項所述之粉體塗裝之塗料，其中該填充金屬奈米碳球之填充物包括純金屬、金屬氧化物、金屬碳化物、金屬硫化物、金屬氮化物、金屬硼化物、或合金。
  5. 如申請專利範圍第1項所述之粉體塗裝之塗料，其中該奈米碳球之外殼包括一掺雜物，且該掺雜物包括氮、磷、或硼。
  6. 如申請專利範圍第1項所述之粉體塗裝之塗料，其中該奈米碳球之外殼具有一化學改質官能基與該樹脂基體交聯。
  7. 如申請專利範圍第1項所述之粉體塗裝之塗料，更包括一填充粒子，且該填充粒子與該奈米碳球之重量比介於1：1至1：10之間。
  8. 如申請專利範圍第7項所述之粉體塗裝之塗料，其 中該填充粒子包括奈米碳管、碳黑、金屬粉末、氮化硼、氮化鋁、或陶磁粉末。
  9. 一種粉體塗裝之方法，包括：提供一金屬物件，施加一電壓至該金屬物件；摩擦申請專利範圍第1項所述之粉體塗裝之塗料，使其帶有一電荷，且該電荷與施加至該金屬物件之電壓的電性相反；以噴嘴將該塗料噴灑至該金屬物件形成一塗層。
  10. 如申請專利範圍第9項所述之粉體塗裝之方法，其中該金屬物件包括基板、鰭片、或外殼。
TW097146218A 2008-11-28 2008-11-28 粉體塗裝之塗料及方法 TWI393755B (zh)

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US12/404,313 US8088855B2 (en) 2008-11-28 2009-03-15 Powder coating method and paint thereof
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