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    • 8. 发明授权
    • Process for multicoat cathodic wet-on-wet painting of metallic
conductive substrates
    • 多金属阴极湿式湿法涂覆金属导电基材的工艺
    • US4818356A
    • 1989-04-04
    • US905333
    • 1986-09-25
    • Michael GeistGunther OttGeorg SchonArnold DobbelsteinWolfgang Batzill
    • Michael GeistGunther OttGeorg SchonArnold DobbelsteinWolfgang Batzill
    • B05D7/14B05D1/00B05D7/00C09D5/44C09D5/46C25D13/00C25D13/06C25D13/10C25D13/22
    • B05D7/542B05D7/577C09D5/44C25D13/22B05D1/007Y10S524/901
    • The invention relates to a process for coating an electrically conductive substrate, the said substrate being immersed in an aqueous bath based on a cationic synthetic resin binder which is at least in part neutralized with acids and contains amino and/or hydroxyl groups. The said bath contains a mixture of crosslinking agents as well as pigments, fillers, corrosion inhibitors, paint auxiliary substances, and, if appropriate, catalysts, as well as organic solvents in an amount of up to 15% by weight based on the total weight of the coating, the said substrate being cathodically connected. By the action of direct current, a film is deposited on the substrate, after which the said substrate is removed from the bath and the film is cured by stoving, the mixture of crosslinking agents comprising at least two crosslinking agents of different reactivities based on activated esters and/or polyisocyanates blocked by different blocking agents. The expression "different reactivities" means that the crosslinking reaction commences by heating to temperatures which are separated by at least 10.degree. C. and that crosslinking agent which is first to react is present in an amount of 15 to 60 mol %, based on the mixture of the crosslinking agents. This first coat is rinsed and one or more further cathodic coats are deposited before stoving. After each coat has been rinsed, all the coats are cured together.
    • PCT No.PCT / EP85 / 00694 Sec。 371日期1986年9月25日第 102(e)日期1986年9月25日PCT提交1985年12月11日PCT公布。 公开号WO86 / 03791 日本1986年7月3日。本发明涉及一种涂覆导电基材的方法,所述基材基于阳离子合成树脂粘合剂浸渍在水浴中,所述阳离子合成树脂粘合剂至少部分地被酸中和并含有氨基和/ 或羟基。 所述浴包含交联剂以及颜料,填料,腐蚀抑制剂,涂料辅助物质以及适当的催化剂以及基于总重量的至多15重量%的有机溶剂的混合物 的涂层,所述衬底被阴极连接。 通过直流电的作用,将膜沉积在基底上,然后将所述基底从浴中除去,并且通过烘烤使膜固化,交联剂的混合物包含基于活化的不同反应性的至少两种交联剂 酯和/或多异氰酸酯被不同的封闭剂阻断。 表述“不同的反应性”是指通过加热至至少10℃分离的温度开始交联反应,并且首先反应的交联剂的存在量为15至60mol%,基于 交联剂的混合物。 冲洗第一层涂层,并在烘烤之前沉积一层或多层其它阴极涂层。 每件外套已经冲洗完毕后,所有的外套都被固化在一起。