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首页> 外文期刊>Journal of Applied Polymer Science >Acrylic-ester-polyol based novel two-component polyurethane clear coat: Evaluation of performance characteristics
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Acrylic-ester-polyol based novel two-component polyurethane clear coat: Evaluation of performance characteristics

机译：基于丙烯酸酯 - 多元醇的新型双组分聚氨酯透明涂层：性能特征评价

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摘要

In the current study, a combination of acrylic polyol (AP) and ester polyol (EP) were synthesized and reacted at variable ratios with hexamethylene diisocyanates and isophorone diisocyanates to prepare a transparent two-component polyurethane (PU) coating formulation. The formations of the polyol system, isocyanate system, and the PU systems were confirmed by H-1 nuclear magnetic resonance and Fourier-transform infrared spectroscopy. Transparency of the coatings was examined using haze, and gloss measurement, which showed acrylic-ester-polyurethane (aePU-5 and aePU-6) have 91.5% and 91.8% transparency and gloss of 90.3 and 90.7 GU respectively. The thermal properties like T-g and the thermal stability of the coatings were verified using differential scanning calorimetry, and thermogravimetric analysis respectively which was found to increase with increasing EP content and decreasing AP content which may be ascribed to improved compatibility of copolymers, and homogeneity in PU along with enhanced crosslinking density. The degree of adhesion of coating with the substrate was validated from lap-shear, and cross-cut tape test which showed improved performance at AP:EP ratio of 60:40. The coatings were found to exhibit resistance toward pencil hardness with aePU-5 and aePU-6 having the optimum resistance of 9H. The surface morphology and topography were observed under scanning electron microscopy, and atomic force microscopy, respectively. The outcome confirms the higher smoothness of the surfaces subjected to the increase in EP content. The PU system with 40 wt% AP content and 60 wt% EP designated as aePU-5 was found to exhibit optimum performance.
机译：在目前的研究中，合成了丙烯酸多元醇（AP）和酯多元醇（EP）的组合，并以可变比例与六亚甲基二异氰酸酯和异佛尔酮二异氰酸酯反应，以制备透明的双组分聚氨酯（PU）涂料配方。多元醇体系、异氰酸酯体系和PU体系的形成通过H-1核磁共振和傅里叶变换红外光谱得到证实。使用雾度和光泽度测量对涂层的透明度进行了检查，结果表明，丙烯酸酯聚氨酯（aePU-5和aePU-6）的透明度和光泽度分别为91.5%和91.8%，分别为90.3和90.7 GU。使用差示扫描量热法和热重分析分别验证了涂层的热性能，如T-g和热稳定性。热重分析发现，随着EP含量的增加和AP含量的降低，涂层的热性能会增加，这可能是由于共聚物的相容性得到改善，PU中的均匀性随着交联密度的增加而增加。通过搭接剪切和横切胶带试验验证了涂层与基材的粘合程度，表明AP:EP比为60:40时性能有所改善。研究发现，涂层具有耐铅笔硬度的性能，aePU-5和aePU-6的最佳耐铅笔硬度为9H。分别用扫描电子显微镜和原子力显微镜观察其表面形貌和形貌。结果证实，EP含量增加后，表面光滑度更高。研究发现，AP含量为40 wt%且EP含量为60 wt%的PU系统（指定为aePU-5）表现出最佳性能。

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