【作者】 杨乐；

【导师】 吕亚非；

【作者基本信息】 北京化工大学 ， 材料学， 2007， 硕士

【摘要】 滚塑成型，又称旋转成型，主要用于生产塑料中空制品，由于其成本低，制品质量好等优点，增长速度远高于注射、挤出等其他塑料制品成型加工业，受到行业的广泛关注。目前，我国的滚塑行业处于快速发展时期。同时，滚塑成型工艺也存在成型周期长，耗能高，对塑料原料要求高等缺点。为此，本论文通过采用微波塑化工艺，在塑料原料中加入微波吸收材料，研究了塑料在微波场中的生热性能，并对把微波加热技术应用于滚塑成型工艺进行了探索。文中选用碳黑、钕铁硼和三氧化二铝作为微波生热剂，分别与高密度聚乙烯、线性低密度聚乙烯粉料进行混合，测试了其微波生热性能。结果显示，碳黑N₂₃₄的生热效果最优，而NdFeB和Al₂O₃则需要大量加入才能实现塑料的塑化。文中还探讨了HDPE粒料的微波塑化工艺，以及使用复合生热剂和间歇式微波塑化工艺对于塑料微波塑化的影响。HDPE粒料可以通过与生热剂的熔融共混实现在微波场中的塑化，且复合生热剂以及间歇式微波塑化工艺进一步完善了塑料的微波塑化工艺。最后，本论文还对于可视化的微波加热滚塑成型装置进行了设计，并初步研究了LLDPE的滚塑发泡成型。实验结果显示，制品的发泡效果良好，为今后进一步研究滚塑发泡机理奠定了基础。更多还原

【Abstract】 Rotational Molding, also known as rotomolding, mostly used as processing of hollow plastic products. The development of Rotational Moulding grew faster than other plastic processing as injection molding or extrusion for its lower cost and fine products, which given extensive attention by the plastic industry. The industry of rotational molding in China presently enjoy a period of rapidly increase.Similar with other plastic processing methods, the rotational molding also has some disadvantages, just like long processing cycle, high energy consumption and limitation of plastic materials for use. So the main purpose of this paper is to discussing the heat property of polyolefin plastic under the microwave radiation and investigating the feasibility of the use of microwave heating in rotational molding. The microwave processing has been used in the experiment, also some additives which could absorb microwave were used compounding with plastic. Selected Carbon black, NdFeB and Al₂O₃, mixing with HDPE, LLDPE powder respectively, took the test for their microwave heating property under microwave radiation. Results showed that, the microwave heating property of carbon black was the best of three additives, and NdFeB and Al₂O₃ only could achieve the purpose in much higher content of those. Also some other methods as HDPE granules, compounded additive and in-continuous processing have been introduced into the experiment to improve the microwave heating effect of the blends.Finally, a special design of visible rotational molding equipment using microwave heating has been done for laboratory use. Then rotational foaming molding of LLDPE has been done. Results showed a nice surface of the products, which could confirm the next step of the research on foam mechanism.更多还原