Abstract The present study investigates the individual effects of three different thermosetting waste materials, used as fillers, on the mechanical, thermal and flow properties of acetal copolymers (POM). Different amounts ranging from 5% to 30% by weight of hydrolyzed powder coating recyclates were mixed as filler material in POM. The matrix and the fillers were first dry-mixed and then compounds were prepared through melt extrusion. The resulting compounds were cooled, granulated, and then standard tensile test bars were produced through use of an injection-molding machine. We investigated the mechanical and thermal properties of test specimens, and tensile strength, bending strength and impact strength were evaluated as a function of type and amount of filler material in the POM matrix. In addition, the change in melt flow index of POM/filler mixtures was determined, before and after extrusion. Furthermore, the morphology of the specimens was examined via electron microscopy. The results of this investigation are encouraging and present an innovative approach to reutilize hydrolyzed electrostatic powder coating wastes with thermoset structures as fillers in acetal copolymers.

中文翻译：

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粉末涂料废料增强乙缩醛共聚物的机械、热和形态特性

摘要 本研究调查了用作填料的三种不同热固性废料对缩醛共聚物 (POM) 的机械、热和流动性能的影响。将 5% 至 30%（重量）的不同数量的水解粉末涂料回收物混合作为 POM 中的填充材料。首先将基质和填料干混，然后通过熔融挤出制备复合物。将所得化合物冷却、造粒，然后通过使用注塑机生产标准拉伸测试棒。我们研究了试样的机械和热性能，并根据 POM 基体中填充材料的类型和数量对拉伸强度、弯曲强度和冲击强度进行了评估。此外，在挤出之前和之后确定 POM/填料混合物的熔体流动指数的变化。此外，通过电子显微镜检查样品的形态。这项研究的结果令人鼓舞，并提出了一种创新的方法来重新利用具有热固性结构的水解静电粉末涂料废物作为乙缩醛共聚物中的填料。