申请人:ANIC S.p.A.
公开号:EP0103332A1
公开(公告)日:1984-03-21
There is disclosed the coating of a metallic substrate with a cross-linked polymeric film by contacting the substrate with an aqueous composition containing:
- at least an acrylic or metacrylic compound which can be defined by the general formula:
wherein:
R is a straight-line or branched aliphatic hydrocarbon radical, either saturated or unsaturated containing from 2 to 10 carbon atoms, or a cycloaliphatic or an aromatic group;
R, and R2, equal to or different from one another, are straight-line or branched alkyl groups, either saturated or unsaturated and containing from 1 to 8 carbon atoms, or cycloaliphatic or aromatic groups;
-at least one unsaturated organic acid capable of being ' copolymerized with the compound (I), in an amount of from 5 to 40 parts by weight per 100 parts of the compound (I) or an organic or a mineral acid which cannot be copolymerized with the compound (I) in an amount of from 1 to 10 parts by weight per 100 parts of the compound (I). and
- a polymerization catalyst preferably selected from among the persulphates, the hydroperoxides, the peracids H2O2 and the peroxides.
A metallic substrate coated by the composition of polymeric nature as described above ist than heated to a temperature equal to, or lower than 180 °C approximately and for the time which is necessary to originate a polymeric film cross-linked upon said substrate.
A film so deposited exhibits optimum properties as to adherence, resistance to bending and shocks and resistance to the saline mist.
本发明公开了在金属基底上涂覆交联聚合物薄膜的方法,该方法是将基底与含有以下成分的水性组合物相接触:
- 至少一种可由通式定义的丙烯酸或偏丙烯酸化合物:
其中
R 是含有 2 至 10 个碳原子的饱和或不饱和的直链或支链脂肪族烃基,或环脂族或芳香族基团;
R,和 R2,彼此相等或不同,是含有 1 至 8 个碳原子的饱和或不饱和的直链或支链烷基,或环脂族或芳香族基团;
-至少一种能与化合物(I)共聚的不饱和有机酸,其用量为每 100 份化合物(I)中 5 至 40 份(按重量计),或一种不能与化合物(I)共聚的有机酸或矿物酸,其用量为每 100 份化合物(I)中 1 至 10 份(按重量计)。
- 一种聚合催化剂,最好选自过硫酸盐、氢过氧化物、过酸 H2O2 和过氧化物。
将涂有上述聚合性质组合物的金属基底加热到大约等于或低于 180 °C 的温度,并加热一定时间,以便在所述基底上形成交联的聚合薄膜。
这样沉积下来的薄膜在粘附性、抗弯曲性、抗冲击性和抗盐雾性方面都具有最佳性能。