铝合金用低温固化聚酯粉末涂料
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摘要
用新戊二醇、对苯二甲酸、己二酸、丁基锡酸和偏苯三酸酐开发了适用于β-羟烷基酰胺(β-HAA)体系的低温固化聚酯树脂。采用X射线粉末衍射方法分析它的结晶度,并利用傅里叶变换红外光谱仪表征了分子结构。将该聚酯树脂制备成粉末涂料,静电喷涂在6063铝合金上,通过人工紫外光加速老化试验(QUV)考察了固化温度和固化时间对所得涂膜保光率(以此来反映涂膜的耐候性)的影响。所制粉末涂料在160°C/10 min的条件下固化后,涂膜在1 000 h老化试验后的保光率为93.6%,且在机械性能、耐酸性盐雾腐蚀、耐溶剂性、耐湿热性等方面表现优异。
A low-temperature curable polyester resin suitable for β-hydroxyalkyl amide(β-HAA) system was developed using neopentyl glycol,terephthalic acid,adipic acid,butylstannoic acid and 1,2,4-benzenetricarboxylic anhydride.Its crystallinity was analyzed by X-ray powder diffraction,and its molecular structure was characterized by Fourier-transform infrared spectroscopy.A powder coating was prepared from this polyester resin and then electrostatically sprayed on a 6063 aluminum alloy surface.The effects of curing temperature and time on gloss retention,which is an index for weatherability,of the cured film obtained therefrom was studied by artificial ultraviolet accelerated aging test(QUV).The coating cured at 160 °C for 10 min has a 93.6% gloss retention after 1 000 h QUV test and excellent mechanical properties and resistance to acidic salt spray corrosion,solvent and damp heat test.
A low-temperature curable polyester resin suitable for β-hydroxyalkyl amide(β-HAA) system was developed using neopentyl glycol,terephthalic acid,adipic acid,butylstannoic acid and 1,2,4-benzenetricarboxylic anhydride.Its crystallinity was analyzed by X-ray powder diffraction,and its molecular structure was characterized by Fourier-transform infrared spectroscopy.A powder coating was prepared from this polyester resin and then electrostatically sprayed on a 6063 aluminum alloy surface.The effects of curing temperature and time on gloss retention,which is an index for weatherability,of the cured film obtained therefrom was studied by artificial ultraviolet accelerated aging test(QUV).The coating cured at 160 °C for 10 min has a 93.6% gloss retention after 1 000 h QUV test and excellent mechanical properties and resistance to acidic salt spray corrosion,solvent and damp heat test.
引文
[1]林巧銮.国外低温固化粉末涂料的研究及其应用概况[J].电机电器技术,1990(1):37-40,33.
[2]张欣华,邵妃.户外粉末涂料用低温固化聚酯树脂的开发[J].涂料技术与文摘,2014,35(3):14-17.
[3]孙国良,刘治猛,刘煜平,等.环氧粉末涂料低温固化剂的合成及应用[J].应用化工,2008,37(12):1432-1435,1439.
[4]李文渊,曹有名.低温固化环氧粉末涂料的研究[J].涂料工业,2014,44(10):7-11.
[5]潘清林.材料现代分析测试实验教程[M].北京:冶金工业出版社,2011:17-20.
[2]张欣华,邵妃.户外粉末涂料用低温固化聚酯树脂的开发[J].涂料技术与文摘,2014,35(3):14-17.
[3]孙国良,刘治猛,刘煜平,等.环氧粉末涂料低温固化剂的合成及应用[J].应用化工,2008,37(12):1432-1435,1439.
[4]李文渊,曹有名.低温固化环氧粉末涂料的研究[J].涂料工业,2014,44(10):7-11.
[5]潘清林.材料现代分析测试实验教程[M].北京:冶金工业出版社,2011:17-20.