Thermosetting powder coating composition, method for forming coating film of the composition, and coating film
申请人:MITSUI CHEMICALS, INC.
公开号:EP1362899A2
公开(公告)日:2003-11-19
Disclosed is a thermosetting powder coating composition comprising a glydicyl group-containing acrylic copolymer component (A) and a curative component (B) composed of dodecanedioic acid linear polyacid anhydride or tetradecanedioic acid linear polyacid anhydride, wherein the time ΔT required for decrease of the absolute value of a complex elastic modulus (η*) of said composition from 100000 Pa·s to 5 Pa·s is not more than 200 seconds, said absolute value of a complex elastic modulus being measured by a dynamic viscoelasticity measuring device under the specific conditions. The thermosetting powder coating composition is favorable for clear coating of automotive parts and automotive top clear coating, and exhibits, particularly in coating of a thin film of 35 to 50 µm, excellent appearance (smoothness, gloss, transparency, etc.), physical properties of practical level (hardness, scratch/mar resistance, etc.) and chemical properties (acid resistance, solvent resistance, etc.).
本发明公开了一种热固性粉末涂料组合物,该组合物由含乙二基的丙烯酸共聚物组分(A)和由十二烷二酸线性聚酸酐或十四烷二酸线性聚酸酐组成的固化剂组分(B)构成、其中,所述组合物的复合弹性模量(η*)的绝对值从 100000 Pa-s 下降到 5 Pa-s 所需的时间 ΔT 不超过 200 秒,所述复合弹性模量的绝对值由动态粘弹性测量装置在特定条件下测量。该热固性粉末涂料组合物有利于汽车零件的透明涂层和汽车顶部透明涂层,特别是在涂覆 35 至 50 µm 薄膜时,具有优异的外观(平滑度、光泽度、透明度等)、实用的物理性能(硬度、抗划伤/抗磨损性等)和化学性能(耐酸性、耐溶剂性等)。