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Epoxy functional acrylic coating powders and powder coatings therefrom having improved filiform corrosion resistance
Epoxy functional acrylic coating powders and powder coatings therefrom having improved filiform corrosion resistance
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机译:具有改善的丝状耐腐蚀性的环氧官能丙烯酸涂料粉末和由其制成的粉末涂料
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摘要
The present invention provides coating powders that enable improved filiform corrosion resistance in clear or tinted clear coating comprising an epoxy functional acrylic copolymer component having a Tg of from 40° C. to 90° C. and chosen from a copolymer or copolymer mixture that comprises, based on the total weight of copolymerized monomers in the epoxy functional acrylic copolymer component, i) from 10 to 40 wt. % of one or more epoxy functional unsaturated monomer, e.g. glycidyl (meth)acrylate; ii) from 2.0 wt. % to 13 wt. %, preferably 12 wt. % or less, or, more preferably, 6 wt. % or less, of one or more hydrophobic acrylic monomer that has a mass solubility in water of 3.5 g/L or less and which would itself form a homopolymer having a glass transition temperature (Tg) of 50° C. to 175° C., e.g. a bicycloalkyl(meth)acrylate, and iii) the remainder of one or more nonionic comonomer that is not a hydrophobic acrylic monomer ii), e.g. methyl methacrylate; one or more crosslinker for the thermosetting acrylic copolymer; and, optionally, one or more adhesion promoter, e.g. epoxy resin, a light stabilizer, an ultraviolet (UV) absorber, and/or a hydrophobic submicron particle.
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机译:本发明提供了涂料粉末,其能够在透明或着色的透明涂料中提高耐丝状腐蚀性能,所述涂料包含具有40℃至90℃的TSubg的环氧官能丙烯酸共聚物组分,并选自以下。共聚物或共聚物混合物,基于环氧官能丙烯酸共聚物组分中的共聚单体的总重量计,i)为10至40重量%。 %的一种或多种环氧官能不饱和单体,例如(甲基)丙烯酸缩水甘油酯; ii)从2.0 wt。 %至13 wt。 %,优选12重量%。 %或更少,或更优选6重量%。 %或更少的一种或多种疏水丙烯酸类单体,其在水中的质量溶解度为3.5 g / L或更小,并且其本身将形成玻璃化转变温度(T g Sub>)为50的均聚物°C至175°C,例如(甲基)丙烯酸二环烷基酯,和iii)不是疏水性丙烯酸单体的一种或多种非离子共聚单体的其余部分。甲基丙烯酸甲酯;用于热固性丙烯酸共聚物的一种或多种交联剂;以及任选地,一种或多种增粘剂,例如环氧树脂,光稳定剂,紫外线(UV)吸收剂和/或疏水性亚微米颗粒。
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