A blend of (I) an advanced epoxy-based cationic resin prepared by reactng in the presence of a suitable catalyst (A) a composition comprising (1) from 20 to 100 weight percent of a diglycidyl ether of a polyol and (2) from zero to 80 weight percent of a diglycidyl ether of a dihydric phenol with (B) at least one dihydric phenol and optionally, (C) a monofunctional capping agent; wherein components (A) and (B) are employed in such amounts that the resultant advanced epoxy resin has an average epoxide equivalent weight of from 350 to 10,000 whereby there is formed an advanced epoxy resin having terminal oxirane groups and subsequently converting at least some of the oxirane groups to cationic groups; and (II) a different epoxy-based cationic cathodic electrodeposition resin. Such resin blends can be utilized in cathodic electrodeposition coating system. These resin blends provide coating compositions with lower viscosity and produces electrodeposition coatings of higher film build than compositions which do not contain component I.
一种(I)高级环氧基阳离子
树脂的混合物,其制备方法是在适当的催化剂存在下,将(A)包括(1)20-100 重量%的多元醇
二缩水甘油醚和(2)0-80 重量%的二元
酚二缩水甘油醚的组合物与(B)至少一种二元
酚和任选的(C)单官能团封端剂反应;其中组分(A)和(B)的用量应使生成的高级环氧
树脂具有 350 至 10,000 的平均环氧当量重量,从而形成具有末端
环氧乙烷基团并随后将至少部分
环氧乙烷基团转化为阳离子基团的高级环氧
树脂;以及 (II) 不同的环氧基阳离子阴极电沉积
树脂。 这种
树脂混合物可用于阴极电沉积涂料体系。与不含 I 组分的组合物相比,这些
树脂混合物可提供粘度更低的涂层组合物,并产生成膜率更高的电沉积涂层。