Microwave Drying of Polymers

N. P. Vasilakos, F. Magalhães
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引用次数: 19

Abstract

AbstractThe technical feasibility of using microwaves to dry various types of commercial polymers was investigated in batch-mode experiments with a 1-k W microwave generator/cavity. The polymers tested were polypropylene, low-density polyethylene, hydroxyelhyl cellulose, polyisoprene rubber, and vinyl chloride/vinyl acetate copolymer. A variety of microwave-drying conditions was employed, including input power levels between 100 and 1000 W. and sample amounts from 5 to 100 g. A series of drying curves (moisture content versus time) was generated, and changes in the physical properties of the dried materials were determined. The results show that the polyolefin resins, polypropylene and polyethylene, are very good candidates for drying with microwave energy. Hydroxyethyl cellulose and vinyl chloride/vinyl acetate copolymer, on the other hand, demonstrated good potential only under some drying conditions, while for others, severe degradation (burning) of these materials occurred. Finally, polyisoprene rubbe...
聚合物的微波干燥
摘要采用1kw微波发生器/腔,研究了微波干燥多种商用聚合物的技术可行性。测试的聚合物有聚丙烯、低密度聚乙烯、羟乙基纤维素、聚异戊二烯橡胶和氯乙烯/醋酸乙烯共聚物。采用了多种微波干燥条件,包括输入功率在100到1000 w之间,样品量从5到100 g。生成了一系列干燥曲线(含水率随时间的变化),并测定了干燥后物料物理性质的变化。结果表明,聚丙烯和聚乙烯等聚烯烃树脂是微波能干燥的理想材料。另一方面,羟乙基纤维素和氯乙烯/醋酸乙烯共聚物仅在某些干燥条件下显示出良好的潜力,而在其他条件下,这些材料会发生严重的降解(燃烧)。最后,聚异戊二烯橡胶…
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