Rapid spheronization of irregular polymeric particles via microwave heating without stirring
Rapid spheronization of irregular polymeric particles via microwave heating without stirring
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通过微波加热无需搅拌即可快速滚圆不规则聚合物颗粒
DOI：
10.1016/j.powtec.2022.118189
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发表时间：
2022-12
影响因子：
5.2
通讯作者：
Guangxian Li
中科院分区：
文献类型：
--
作者：
Lisong Sun;Xing Wang;Zhengzhe Wang;Shenao Zhou;Yang Wei;Yajiang Huang;Guangxian Li
聚合物低温粉碎粉末的不规则形状极大地降低了其流动性和堆积行为，严重限制了其在许多领域如粉末床熔融（PBF）加工中的应用。在这项研究中，低温粉碎的聚丙烯（PP）粉末分散在聚（乙二醇）（PEG）液体，然后进行微波加热，实现快速球化没有搅拌。考察了微波时间、PEG分子量、粉体/隔离剂含量等因素对球化效果的影响，考察了颗粒形貌和产率。球形化后的PP粉末具有良好的流动性和结晶性能。PP粉末在球化过程中发生降解，但用抗氧剂330涂覆粉末可以部分补救。这些结果表明，微波球化在液相中可能是一个有前途的技术，为大规模制备球形粉末PBF加工。
The irregular shape of cryogenically pulverized polymer powders greatly deteriorates their flowability and packing behavior, severely limiting their applications in many fields such as powder bed fusion (PBF) processing. In this study, cryogenically pulverized polypropylene (PP) powders were dispersed in poly(ethylene glycol) (PEG) liquids and then subjected to microwave heating to realize rapid spheroidization without stirring. The effects of the microwave time, the molecular weight of PEG, and the contents of the powder/segregation agent on the spheroidization effect were systematically investigated in terms of particle morphology and yield. The spheroidized PP powder exhibited excellent powder flowability and improved crystallization behavior. Degradation of PP powder occurred during the spheroidization process but could be remedied partially by coating the powder with antioxidant 330. These results suggested that microwave spheroidization in a liquid phase may be a promising technique for the large-scale preparation of spherical powders for PBF processing.
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影响因子：
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作者：
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影响因子：
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