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杜邦公司生产的第二代高阻隔性EVOH,由于加入了一种有机材料,因而具有较高的机械强度。 第一代高阻隔性EVOH树脂,也是杜邦公司生产的,其充填材料为云母,虽然气体阻隔性比标准的EVOH提高了3～5倍,但在应用方面仍受到一定的限制。这是由于充填了云母的EVOH,变得较脆,其包装产品比标准的EVOH多层共挤瓶,跌落高度要降低20～30%,抗挠曲性能也有较大下降,因此,第一代EVOH仅推荐用于厚度为1密耳(相当于0.001英寸)的硬质容器。 为了改善高阻隔性EVOH的物理特性,
DuPont’s second generation of high barrier EVOH, due to the addition of an organic material, which has a high mechanical strength. The first generation of high barrier EVOH resin, also produced by DuPont, is filled with mica. Although gas barrier properties are 3 to 5 times higher than standard EVOH, there are still some limitations in terms of application. This is because the mica-filled EVOH becomes brittle, and its packaging products have a 20 to 30% drop height and a greater reduction in flexing resistance than the standard EVOH multi-layer coextrusion bottle. Therefore, the first generation EVOH is only recommended for rigid containers with a thickness of 1 mil (equivalent to 0.001 in.). In order to improve the physical properties of high barrier EVOH,