发明授权
US4948678A Organic composite plated steel sheet highly susceptible to cationic
electrodeposition
失效
有机复合电镀钢板极易受阳离子电沉积的影响
- 专利标题: Organic composite plated steel sheet highly susceptible to cationic electrodeposition
- 专利标题(中): 有机复合电镀钢板极易受阳离子电沉积的影响
-
申请号: US468296申请日: 1990-01-22
-
公开(公告)号: US4948678A公开(公告)日: 1990-08-14
- 发明人: Yoshio Shindou , Takashi Shimazu
- 申请人: Yoshio Shindou , Takashi Shimazu
- 申请人地址: JPX
- 专利权人: Nippon Steel Corporation
- 当前专利权人: Nippon Steel Corporation
- 当前专利权人地址: JPX
- 优先权: JPX1-013342 19890123
- 主分类号: B05D7/14
- IPC分类号: B05D7/14 ; B05D7/00 ; B05D7/24 ; B32B15/08 ; B32B15/092 ; C08G18/40 ; C08G18/58 ; C08G59/40 ; C09D175/04 ; C25D13/06
摘要:
The present invention provides an organic composite plated steel sheet highly susceptible to cationic electrodeposition comprising a steel substrate plated with one selected from the group consisting of zinc, a zinc alloy, a zinc composite alloy, or aluminum, and a first layer of a less soluble chromate film having a water soluble content of 5% or less formed on the substrate in an amount of 10 to 150 mg as the total amount of chromium per square meter, and a second layer as a solid thin coating film of 0.1 to 2 .mu.m formed on the first layer, the second layer being formed with a coating composition containing 10 to 50% by weight of solids comprising:(a) 30% by weight or more of a bisphenol A type epoxy resin having a number average molecular weight of 300 to 100,000 based on the total solids in the coating composition;(b) a weight ratio of at least one curing agent selected from the group consisting of polyisocyanate compounds and block polyisocyanate compounds to the epoxy resin solid of 0.1 to 2.0;(c) 5 to 50% by weight of fumed silica having an average particle size of 0.1 to 100 nm based on the total solids in said coating composition;(d) at least one pigment selected from the group consisting of insoluble azo type, azo lake type, and phthalocyanine type organic pigments having an average size of 0.01 to 2 .mu.m in an amount of 0.1 to 15% by weight based on the total solids in the coating composition and in a weight ratio of the pigment to the fumed silica of 0.01 to 1.0; and(e) 40% or more of a ketone type organic solvent in the coating composition.