200829666 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種電泳塗裝之方法，尤其係涉及一種多 色電泳塗裝之方法。 【先前技術】 電泳塗裝（electro-coating)係將工件及對應之電極放 ^水溶性塗料中，接上電源後，依靠電場所產生之物理化 學作用，使塗料中之樹脂、色料於以被塗物為電極之表面 上均勻析出並沉積形成不溶於水之漆膜之一種塗裝方法。 電泳塗裝係一個極為複雜之電化學反應過程，其中至少包 括電永、電沉積、電滲、電解四個過程。電泳塗裝係近幾 :年來發展起來之一種特殊塗膜形成方法，係對水性塗料 最具有實際意義 之施工工藝。 電冰塗裝與其他塗裝方法相比，具有以下特點： 旦（1)採用了水溶性塗料，以水為溶解介質，節省了大 里之有機溶劑，大大降低了 A氣污染及環境危害，安全衛 生’同時避免了火災之隱患。 塗料之利用率可達 (2 )塗裝效率高，塗料損失小， 90%-95% 〇 塗裝質量好，工件各 解決了其他塗裝方法 (3)塗膜厚度均勻，附著力強， 個部位都能獲得均勻、平滑之漆膜， 對複雜形狀工件之塗裝難題。 (4 )生產效率局，施工可實現自 提高勞動效率。 施工可實現自動化連續生產，大大 (5 )只能採用水溶性塗料， 於塗裝過程中不能改變顏 200829666 色。 由上述可知，電泳塗裝雖然具有水溶性、無毒、易於 自動控制等優點’但電泳塗裝於塗裝過程中不能改變顏 色。如此」於電泳塗裝工藝中，只能生產出單種顏色效果 之產品外觀，不能滿足為了提升產品之裝飾性而於產品表 面形成不同顏色之外觀要求。 【發明内容】 鑒於以上習知技術之缺點，有必要提供一種可以於產 品表面形成不同顏色外觀效果之多色電泳塗裝方法。 一種於金屬基體表面多色電泳塗裝之方法，包括以下 步驟： 對該金屬基體進行第一次局部印刷油墨處理，從而於 該金屬基體表面形成一油墨層及一第一局部裸露區； 對該金屬基體進行第一次電泳塗裝處理，於所述第一 局部裸露區形成^一第一塗層； 去除該金屬基體表面之油墨層，使所述金屬基體表面 裸露一第二局部裸露區； 對該金屬基體進行第二次電泳塗裝處理，於所述第二 局部裸露區形成一第二塗層，所述第一塗層與所述第二塗 層之顏色不同。 另一種於金屬基體表面多色電泳塗裝之方法，包括以 下步驟： 對該金屬基體進行第一次局部印刷油墨處理，從而於 該金屬基體表面形成一油墨層及一第一局部裸露區； 對該金屬基體進行第一次電泳塗裴處理，於所述第一 200829666 局部裸露區形成一第一塗層； 去除該金屬基體表面之油墨層並對該金屬基體進行第 ，次局部印刷油墨處理，使所述金屬基體表面裸露形成一 第二局部裸露區； 對該金屬基體進行第二次電泳塗裝處理，於所述第二 局部裸露區形成一第二塗層，所述第一塗層與所述第二 層之顏色不同。 與習知技術相比，所述多色電泳塗裝方法，於進行第 :次電冰塗裝處理之前先進行局部印刷油墨，而將金屬基 體表面局部裸露一所需圖案。由於印刷之油墨係非導電材 料’於進仃第一:欠電泳塗裝時僅會將裸露之金屬表面電泳 塗裝。接著去除該印刷油墨，將先前被該印刷油墨覆蓋之 金屬表面進行第二次電泳塗裝。分別於第一次、第二欠電 ㈣添加不狀色料或該第塗裝所用塗 π二^弟一-人電泳塗裝所用塗料不添加色料，從而實現於 5金屬基體表面電泳塗裝不同顏色之外觀圖案。 【實施方式】 凊參閱圖1所示，本發明產六社途^ + & 5季乂仏實轭例之多色電泳塗裝 方法以於金屬基體10表面 衣 全 進仃電，水塗裝為例加以說明，該 細^ 系上㊉用之金屬，例如：鐵、鋁、不銹 鋼、銅、鋁合金、鋅合金成糕入人聲 办 % -^ .. B ^ 金次鎮s金等。所述多色電泳塗裝 方法具體包括如下步驟： 明參閱圖2所不，/V F? tL + 耳先對該金屬基體10表面進行第一 久局部印刷油墨處理 乐 I屎 攸而於該金屬基體10表面形成一油 墨層20及一第一局部 Λ /田 勹卩稞路區，該局部裸露區形成一圖荦 200829666 ，12。該圖案12可以為跖兩 -圓形圖案12。該第一：之任意形狀之圖案，圖2所示為 導電材料。 °弟久局部印刷油墨處理所用油墨為非 — 3所示’然後對該金屬基體表面進行第- =電;處塗;時由 i屬基體10局部印刷有油墨層2〇之 :一笛θ $成電'永塗I層，而於該裸露之圓形圖案12上形 成一第一塗層30。 請參閱圖4所示’將該金屬基體1〇放入二甲苯溶液 中，去除該金屬基體矣$ 丄 少 表面之油墨層20，使所述金屬基 體10之表面形成一第二局部裸露區14。 請參閲圖5所示，最後對該金屬基體Μ 泳塗裝處理，由於該第-塗層3G不導電，故於第二:= 塗裝時該金屬基體1()之圓形圖案12區域不會再次护成電 泳塗裝層，而於該金屬基體10上之第二局部裸露區14電 冰塗裝一第二塗層32。 可以理解，所述多色電泳塗農方法，對該金屬基體忉 表面進行第一次局部印刷油墨處理時，還可先對該金屬基 體1〇表面進行除油處理。該除油處理所用之除油^水可^ 氫氧化鈉、碳酸鈉或磷酸三鈉溶液，該除油藥水濃产為 15〜45克/升，於溫度為30~50攝氏度下，將上述全屬=體 1〇浸泡6〜12分鐘對該金屬基體10進行除油處理。狹^利 用軟水清洗經上述除油處理之金屬基體1〇，對該金屬、美體 進行水洗，將殘留於該金屬基體10之除油藥水清 此外，該第一次電泳塗裝處理所用之塗料可為=子 200829666 ，型之電泳塗料，如環氧樹脂型電泳塗料、丙烯酸樹脂型 泳塗料或聚胺脂樹脂型電泳塗料等，也可為陰離子型電、卞 塗料，如陰離子壓克力樹脂電泳塗料、陰離子聚胺脂樹月 型電泳塗料等。該第一次電泳塗裝處理所用之塗料還可^ 加色料，該色料可以為碳黑、二氧化鈦、氧化鐵等無機^ 料或酞菁、偶氮等有機顏料。該第一次電泳塗裝處理所用 之塗料之固體成分重量百分率一般為5〜2〇%，最佳重量百 分率為8〜15 %。電泳電壓一般為3〇〜3〇〇伏特，最佳電泳 電壓為50-200伏特。電泳時間一般為2〇〜18〇秒，最佳電 泳時間為30〜：12〇秒。另，該第二次電泳塗裝處理所^之 塗料可為陽離子型之電泳塗料，如環氧樹脂型電泳塗料、 丙烯酸樹脂型電泳塗料或聚胺脂樹脂型電泳塗料等，也可 為陰離子型電泳塗料，如陰離子壓克力樹脂電泳塗料、陰 離子聚胺脂樹脂型電泳塗料等。該第二次電泳塗裝所用& ，還可添加色料，該色料可以為碳黑、二氧化鈦、氧化鐵 等無機顏料或酞菁、偶氮等有機顏料。為了得到與上述第 人電冰塗裝不同顏色之外觀效果，該第二次電泳塗裝所 用塗料所添加色料應與上述第一次電泳塗裝所用塗料所添 加色料有所不同。同樣可以理解該第一次電泳塗裝所用塗 料或該第二次電泳塗裝所用塗料不添加色料。該第二次電 =塗，所用塗料之固體成分重量百分率一般為5〜20%，最 ^重里百分率為8〜15 %。電泳電壓一般為30〜300伏特， ，it電冰电壓為〜2⑻伏特。電泳時間一般為204 秒，最佳電泳時間為30〜120秒。 由於進行第一次電泳塗裝時所添加之色料不同於進行 11 200829666 第一人電冰塗裝時所添加之色料，如此，可以於該金屬基 體ίο表面幵> 成不同顏色相接之外觀效果。可以理解，該第 -人電冰塗裝所用塗料與該第二次電泳塗裝所用塗料兩者 之一可不添加色料。 可以理解，將該金屬基體10放入二甲苯溶液中將該油 墨層20去除後，不直接進行上述第二次電泳塗裝處理，而 係對該金―屬基體10進行第二次局部印刷油墨。請參閱圖6 所示，/該第二次局部印刷油墨處理，從而於該金屬基體 表面形成一油墨層20及一第二局部裸露區，該第二局部裸 露區形成一圖案16。該圖案16可以為所需任意形狀圖案， 圖6所不為一方形圖案16。然後對該金屬基體忉進行第 人電泳塗裝處理，睛參閱圖7所示，由於該油墨層 由非導電材料製成，故於該第二次電泳塗裝時該金屬基體 10局部印刷有油墨層2Q之區域不會形成電泳塗裝層，而 於該裸露之方形圖案16上電泳塗裝一第二塗層32。接著， 將該金屬基體10放入二甲苯溶液中，請參閱圖8所示，將 …該油墨層20去除，可以於該金屬基體1〇形成一圓形圖案 12及一方形圖案16之外觀效果。此外，還可根據需 該金屬基體1〇重複上述印㈣墨、電泳塗裝及去除油墨等 步驟，實現於該金屬基體10表面形成至少兩種顏色、多 圖案之外觀效果。 綜上所述，本發明符合發明專利要件，爰依法提出專 利申，。惟’以上所述者僅為本發明之較佳實施例，本發 明之範圍並不以上述實施例為限，舉凡熟習本案技藝之人 士杈依本發明之精神所作之等效修飾或變化，皆應涵蓋於200829666 IX. Description of the Invention: [Technical Field] The present invention relates to a method of electrophoretic coating, and more particularly to a method of multicolor electrophoretic coating. [Prior Art] Electro-coating puts the workpiece and the corresponding electrode into a water-soluble paint. After the power is connected, the physico-chemical action generated by the electric field is used to make the resin and the colorant in the paint. The object to be coated is a coating method in which the surface of the electrode is uniformly deposited and deposited to form a water-insoluble paint film. Electrophoretic coating is an extremely complex electrochemical reaction process, which includes at least four processes: electric eternal, electrodeposition, electroosmosis, and electrolysis. Electrophoretic coating system is a special coating film forming method developed over the years, which is the most practical construction process for water-based coatings. Compared with other coating methods, electric ice coating has the following characteristics: (1) Water-soluble paint is used, water is used as the dissolution medium, which saves the organic solvent of Dali, greatly reduces A gas pollution and environmental hazard, and is safe. Hygiene' while avoiding the hidden dangers of fire. The utilization rate of the coating can reach (2) the coating efficiency is high, the coating loss is small, 90%-95% 〇 the coating quality is good, the workpieces solve the other coating methods (3) the coating film thickness is uniform, the adhesion is strong, A uniform, smooth paint film can be obtained in the parts, which is difficult to apply to complex shaped workpieces. (4) Production efficiency bureau, construction can achieve self-improvement of labor efficiency. The construction can realize automatic continuous production, and (5) only water-soluble paint can be used, and the color can not be changed during the painting process. As can be seen from the above, although electrophoretic coating has the advantages of water solubility, non-toxicity, and easy automatic control, electrophoretic coating cannot change color during the coating process. Thus, in the electrophoretic coating process, only the appearance of a single color effect product can be produced, and the appearance requirements for forming different colors on the surface of the product in order to enhance the decorativeness of the product cannot be satisfied. SUMMARY OF THE INVENTION In view of the above disadvantages of the prior art, it is necessary to provide a multicolor electrophoretic coating method which can form different color appearance effects on the surface of a product. A method for multicolor electrophoretic coating on a surface of a metal substrate, comprising the steps of: performing a first partial printing ink treatment on the metal substrate to form an ink layer and a first partial exposed region on the surface of the metal substrate; Performing a first electrophoretic coating process on the metal substrate to form a first coating layer on the first partial exposed region; removing the ink layer on the surface of the metal substrate to expose a surface of the metal substrate to a second partial exposed region; Performing a second electrophoretic coating process on the metal substrate to form a second coating layer in the second partial exposed region, the first coating layer and the second coating layer being different in color. Another method for multicolor electrophoretic coating on a surface of a metal substrate comprises the steps of: performing a first partial printing ink treatment on the metal substrate to form an ink layer and a first partial exposed region on the surface of the metal substrate; Performing a first electrophoretic coating process on the metal substrate to form a first coating layer on the first exposed portion of the first 200829666; removing an ink layer on the surface of the metal substrate; and performing a second partial printing ink treatment on the metal substrate, Exposing a surface of the metal substrate to form a second partial exposed region; performing a second electrophoretic coating process on the metal substrate to form a second coating layer on the second partial exposed region, the first coating layer The second layer has a different color. Compared with the prior art, the multicolor electrophoretic coating method performs partial printing of the ink before performing the second electro-ice coating treatment, and partially exposes the surface of the metal substrate to a desired pattern. Since the printed ink is a non-conductive material, the first metal: the underlying electroless coating will only be electrophoretically coated on the bare metal surface. The printing ink is then removed and the surface of the metal previously covered by the printing ink is subjected to a second electrophoretic coating. Adding the colorless material to the first and second under-current (four) or the coating used in the first coating, and applying the coating material to the electrophoretic coating of the π-di-di-one-human electrophoretic coating, thereby realizing the electrophoretic coating on the surface of the 5 metal substrate Different color appearance patterns. [Embodiment] Referring to FIG. 1 , the multi-color electrophoretic coating method of the yoke of the invention is applied to the surface of the metal substrate 10, and the water is coated. For example, the metal used in the series, such as: iron, aluminum, stainless steel, copper, aluminum alloy, zinc alloy into a human voice office - - .. B ^ Jinci town s gold and so on. The multi-color electrophoretic coating method specifically includes the following steps: Referring to FIG. 2, the /VF?tL+ ear first performs a first long-term partial printing ink treatment on the surface of the metal substrate 10 on the metal substrate. The surface of the 10 forms an ink layer 20 and a first partial Λ / 勹卩稞 勹卩稞 road area, and the partial exposed area forms a map 200829666, 12. The pattern 12 can be a two-circle pattern 12. The first: any shape of the pattern, shown in Figure 2 is a conductive material. ° The ink used for the partial printing ink processing is not shown in '3' and then the surface of the metal substrate is subjected to the -= electricity; the coating is applied; the ink layer 2 is partially printed by the i-based substrate 10: a flute θ $ The first layer 30 is formed on the exposed circular pattern 12 by the electric layer. Referring to FIG. 4, the metal substrate 1 is placed in a xylene solution, and the ink layer 20 of the surface of the metal substrate is removed to form a second partial exposed region 14 on the surface of the metal substrate 10. . Referring to FIG. 5, finally, the metal substrate is subjected to a coating process. Since the first coating 3G is not electrically conductive, the circular pattern 12 region of the metal substrate 1 () is applied at the second:= coating. The electrophoretic coating layer is not protected again, and the second partial coating 32 is electrically ice coated on the second partial exposed region 14 of the metal substrate 10. It can be understood that, in the multi-color electrophoretic coating method, when the surface of the metal substrate is subjected to the first partial printing ink treatment, the surface of the metal substrate 1 can be first degreased. The degreasing treatment used in the degreasing treatment can be sodium hydroxide, sodium carbonate or trisodium phosphate solution, and the degreasing syrup is produced in a concentration of 15 to 45 g/l at a temperature of 30 to 50 degrees Celsius. The metal substrate 10 is degreased by immersion for 6 to 12 minutes. The metal substrate of the above-mentioned degreasing treatment is cleaned by soft water, the metal and the body are washed with water, and the degreasing water remaining in the metal substrate 10 is removed. The coating for the first electrophoretic coating treatment can be used. For the sub-200829666, type electrophoretic coatings, such as epoxy type electrophoretic coatings, acrylic type swimming coatings or polyurethane resin type electrophoretic coatings, etc., can also be anionic electric and antimony coatings, such as anionic acrylic resin electrophoresis Coatings, anionic polyurethane tree type electrophoretic coatings, etc. The coating material used in the first electrophoretic coating treatment may further add a coloring material, and the coloring material may be an inorganic material such as carbon black, titanium oxide or iron oxide, or an organic pigment such as phthalocyanine or azo. The coating material used in the first electrophoretic coating treatment generally has a solid content weight percentage of 5 to 2% by weight, and an optimum weight percentage of 8 to 15%. The electrophoresis voltage is generally 3 〇 to 3 volts, and the optimum electrophoresis voltage is 50-200 volts. The electrophoresis time is generally 2〇~18〇 seconds, and the optimal electrophoresis time is 30~:12〇 seconds. In addition, the coating of the second electrophoretic coating treatment may be a cationic electrophoretic coating, such as an epoxy resin electrophoretic coating, an acrylic resin electrophoretic coating or a polyurethane resin electrophoretic coating, or an anionic type. Electrophoretic coatings, such as anionic acrylic resin electrophoretic coatings, anionic polyurethane resin electrophoretic coatings, and the like. For the second electrophoretic coating, a coloring material may be added, and the coloring material may be an inorganic pigment such as carbon black, titanium oxide or iron oxide, or an organic pigment such as phthalocyanine or azo. In order to obtain a different color appearance from the above-mentioned first electric ice coating, the color added by the coating for the second electrophoretic coating should be different from the color added by the coating for the first electrophoretic coating described above. It is also understood that the coating for the first electrophoretic coating or the coating for the second electrophoretic coating does not add a colorant. The second electricity = coating, the solid content weight percentage of the coating used is generally 5 to 20%, and the maximum weight percentage is 8 to 15%. The electrophoresis voltage is generally 30 to 300 volts, and the current electric ice voltage is ~2 (8) volts. The electrophoresis time is generally 204 seconds, and the optimal electrophoresis time is 30 to 120 seconds. Since the color added during the first electrophoretic coating is different from the color added when the first human ice coating is performed on 11 200829666, the surface of the metal substrate ίο can be connected to different colors. The appearance of the effect. It can be understood that one of the paint for the first human electro-ice coating and the paint for the second electrophoretic coating may not be added with a colorant. It can be understood that after the metal substrate 10 is placed in the xylene solution to remove the ink layer 20, the second electrophoretic coating process is not directly performed, and the second partial printing ink is applied to the gold-based substrate 10. . Referring to FIG. 6, the second partial printing ink is processed to form an ink layer 20 and a second partial exposed region on the surface of the metal substrate, and the second partial exposed region forms a pattern 16. The pattern 16 can be any desired shape pattern, and FIG. 6 is not a square pattern 16. Then, the metal substrate is subjected to a first person electrophoretic coating process. As shown in FIG. 7, since the ink layer is made of a non-conductive material, the metal substrate 10 is partially printed with ink during the second electrophoretic coating. An electrophoretic coating layer is not formed in the region of the layer 2Q, and a second coating layer 32 is electrophoretically coated on the bare square pattern 16. Next, the metal substrate 10 is placed in a xylene solution. Referring to FIG. 8, the ink layer 20 is removed, and a circular pattern 12 and a square pattern 16 can be formed on the metal substrate 1 . . Further, the above-mentioned printing (four) ink, electrophoretic coating, and ink removal may be repeated according to the need of the metal substrate 1 to achieve an appearance effect of forming at least two colors and a plurality of patterns on the surface of the metal substrate 10. In summary, the present invention complies with the requirements of the invention patent, and proposes a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in accordance with the spirit of the present invention are Should be covered
12 200829666 以下申請專利範圍内。 【圖式簡單說明】 圖1係利用本發明多色電泳塗裝之方法進行塗裝之金 屬基體示意圖； & “ 圖2係對圖1金屬基體進行第一次印刷油墨處理後之 不意圖； 圖3係對圖2金屬基體進行第一次電泳塗裝處理後之 示意圖； 圖4係對圖3金屬基體去除油墨處理後之示意圖· —圖5係對圖4金屬基體進行第二次電泳塗裝處理後之 示意圖； 圖6係對圖4金屬基體進行第—4匕 示意圖； 胃㈣❹一欠印刷油墨處理後之 圖7係對圖6金屬基體進行第-今 一立 示——人電冰塗裝處理後之 不意圖； 圖8係對圖7金屬基體去除油墨處理後之示意圖。 【主要元件符號說明】 金屬基體 10 圖案 12、16 第二局部裸露區 14 油墨層 20 第一塗層 30 第二塗層 32 13 c .¾ j12 200829666 Within the scope of the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a metal substrate which is coated by the multicolor electrophoretic coating method of the present invention; & FIG. 2 is a schematic view of the first printing ink treatment of the metal substrate of FIG. 1; 3 is a schematic view of the metal substrate of FIG. 2 after the first electrophoretic coating treatment; FIG. 4 is a schematic view of the metal substrate after the ink removal process of FIG. 3; FIG. 5 is a second electrophoretic coating of the metal substrate of FIG. Figure 6 is a schematic diagram of the fourth substrate of the metal substrate of Figure 4; stomach (four) ❹ a printing ink after the treatment of Figure 7 is the first metal of the metal substrate of Figure 6 - human ice Figure 8 is a schematic view of the metal substrate after the ink removal process of Figure 7. [Main component symbol description] Metal substrate 10 pattern 12, 16 Second partial exposed region 14 Ink layer 20 First coating 30 Second coating 32 13 c .3⁄4 j