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    • 8. 发明申请
    • Thin chip resistant powder topcoats for steel
    • 薄片耐磨粉末面漆钢
    • US20090110934A1
    • 2009-04-30
    • US12287859
    • 2008-10-14
    • Douglas S. CinomanEdward G. Nicholl
    • Douglas S. CinomanEdward G. Nicholl
    • B32B27/38B05D3/02
    • C08G59/182C09D163/00Y10T428/24967Y10T428/31522Y10T428/31529
    • The present invention provides chip-resistant powder topcoats for corrosion resistant powder coated steel substrates, such as, for example, automotive suspension coil springs, comprising powder coatings formed from one or more wax and a resin component of one or more toughened epoxy resin. The present invention provides dual coatings of toughened epoxy powder basecoats and topcoats, which may be foamed and/or fiber reinforced. The powder used to form the chip resistant topcoat can further comprise up to 200 phr or, preferably, up to 75 phr of one or more extender, or 0.5 or more phr of one or more extender, such as barium sulfate, while fully retaining its chip resistant properties. In addition, the powder used to form the chip resistant topcoat can be a low temperature curing powder comprising one or more low temperature curing agent. The invention provides methods for making the dual coatings comprising applying to the substrate a toughened, zinc-loaded, epoxy coating powder, applying to the powder coated substrate a wax containing toughened epoxy topcoat and heating to fuse or cure the coating powders.
    • 本发明提供耐腐蚀粉末涂覆钢基材的耐芯粉末面漆,例如汽车悬浮螺旋弹簧,其包含由一种或多种蜡形成的粉末涂料和一种或多种增韧的环氧树脂的树脂组分。 本发明提供可以发泡和/或纤维增强的增韧环氧粉末底涂层和面漆的双重涂层。 用于形成耐芯片面漆的粉末可以进一步包含至多200phr,或优选至多75phr的一种或多种增量剂,或0.5或更多phr的一种或多种增量剂,例如硫酸钡,同时完全保留其 耐芯片性能。 此外,用于形成耐芯片面漆的粉末可以是包含一种或多种低温固化剂的低温固化粉末。 本发明提供了制备双重涂层的方法,包括向基体施加增韧的,负载锌的环氧涂料粉末,向粉末涂覆的基材施加含有韧化环氧面漆的蜡并加热以熔化或固化涂料粉末。