This invention provides a novel storage stable, heat curable, coating composition comprising
(a) a ketoxime blocked polyisocyanate,
(b) a polyol containing 2-4 terminal OH groups,
(c) at least one ethylenically unsaturated monomer, oligomer or prepolymer of the formula:
wherein R is H or CH3, R is an organic moiety and n is 1 and preferably at least 2,
(d) a free radical thermal initiator for (c), and
(e) a deblocking and curing catalyst for (a).
The reaction between (a) and (b) in the composition results in a thermoset material which is believed to form an interpenetrating network with the resulting thermoset from (c) on the thermal curing.
The coating composition which is airless sprayable, storage stable and can be cured at low temperatures (about 80 - 120°C) provides a coating having good adhesion to metal surfaces with good abrasion resistance and good corrosion protection.
本发明提供了一种新型贮存稳定、热固化涂层组合物,包括
(a) 酮
肟封端多
异氰酸酯、
(b) 含有 2-4 个末端羟基的多元醇、
(c) 至少一种式中的
乙烯基不饱和单体、低聚物或预聚物:
其中 R 为 H 或
CH3,R 为有机分子,n 为 1,最好至少为 2、
(d) 用于(c)的自由基热
引发剂,以及
(e) (a)的解锁和固化催化剂。
组合物中的(a)和(b)反应会产生一种热固性材料,这种材料在热固化时会与(c)产生的热固性材料形成互穿网络。
这种涂料组合物可无气喷涂,储存稳定,可在低温(约 80 - 120°C)下固化,可提供一种与
金属表面有良好附着力的涂料,具有良好的耐磨性和防腐性。