6,047 research outputs found

    Synthesis of Phosphrous and Nitrogen Containing Flame Retardant and Its Application in Halogen-free Flame Retardant PBT

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    聚对苯二甲酸丁二醇酯(PBT)具有良好的力学性能和电性能且吸水率低,在较高温度下依然能保持其机械性能稳定,使其在汽车零部件、光纤电缆和电子电器中等领域得到广泛应用。但由于纯PBT存在阻燃性较差的缺点,燃烧过程中还存在熔融滴落,因此需要对其进行阻燃改性以满足更加严苛的应用要求。传统含卤素阻燃剂虽然效果好,可是被引燃后会产成有毒物质,使用范围受到限制。建立新型无卤、具有产业化潜力的PBT阻燃体系已成为科研工作者关注的研究热点之一。 本文以常见工业原料亚磷酸二乙酯、9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)和4,4'-二氨基二苯甲烷(DDM)作为反应物,制备出两种含磷、氮元素...PBT is a kind of resin with excellent mechanical performances, good electronic properties and low absorption of water. Also it can maintain its mechanical properties at high temperatures. However, for its poor fire retardancy, such as melting drops, low LOI as well as little carbon residue, the application of PBT in the fields of electronics and automobiles has been limited heavily. Although tradi...学位:理学硕士院系专业:材料学院_高分子化学与物理学号:2072013115005

    Design and Implementation of Automatic Monitoring and Early Warning Analysis System for an Oilfield

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    生产自动化技术发展日新月异,特别是近十年,大型石油企业持续不断地提升生产自动化技术水平,加大生产自动化应用深度,实现石油生产“过程可视化”的同时,消除数据孤岛,实现信息共享,提高信息利用率,提高企业决策水平和实效性,实现管控一体化,已成为石油企业发展综合自动化系统的发展方向。 随着油田现场计算机网络、生产自动化建设不断深入,生产自动化技术和网络技术在油田生产现场各个原油处理站库的应用,促进了油田生产的发展。但随着生产流程的不断改造完善,生产管理人员在使用系统的过程中也不断产生新的应用需求。 本文以某油田原油处理站为对象,采集生产过程实时数据,通过统计计算和事故处理知识库联动,设计并研发基于...With the rapid development of production automation technology, especially in the last ten years, large oil companies have continuously enhanced the level of production automation technology and increased the depth of production automation application to realize the oil production process visualization. Meanwhile, eliminating data silos to achieve information sharing and utilization, improving dec...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323134
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