聚丙烯气相反应器工艺参数的计算和控制

以液相本低聚合和气相聚合组合式聚丙烯（PP）装置生产多相共聚PP产品为例，推导出了多相共聚PP生产中气相反应器工艺参数之间的关系式，并讨论了工艺参数对产品性能的影响，通过控制气相反应器的乙烯进料量与气相比，改变产品的抗冲击性能，乙烯含量越高，产品的抗冲击性能越好，刚性越差，无定形二聚物的含量越高，产品的抗冲击性能越好，但刚性相对降低。     

高档注塑包装桶专用PP树脂K445R的工业开发

通过控制反应压力、温度及反应器气相组成,优化聚丙烯(PP)中共聚单体含量,开发了高档注塑包装桶专用树脂PP K445R.研究表明:高乙烯含量不一定能生成高的乙丙橡胶含量;控制乙烯含量在合理范围内,并保持最佳的气相反应组成,可提高乙丙橡胶含量.产品测试结果表明:K445R熔体流动速率为3.3g/10 min,Izod常温...     

高流动低气味抗冲共聚PP EP533N开发及应用

在兰州石化公司30万t/a Sphripol双环管工艺装置上开发高流动低气味车用聚丙烯(PP)产品PP EP533N。工艺上采用性能优异的催化剂,通过控制相对分子质量调整剂(H_2)加入量、共聚单体的含量以及环管、气相反应器、闪线及汽蒸器的操作参数,使得PP EP533N产品的性能与同类产品相当。将PP EP533N产品应用于仪表板及汽车门板,各项性能均达到用户的要求。     

高流动抗冲击共聚聚丙烯K7227H冲击强度波动原因分析

针对高流动抗冲击共聚聚丙烯K7227H生产过程中出现的冲击强度波动的情况,采用凝胶渗透色谱仪、红外检测器和扫描电子显微镜等分析了K7227H的相对分子质量、乙烯含量、橡胶相含量和相态结构对其力学性能的影响。从工艺控制的角度出发,在保证产品刚性情况下,通过调整第一气相反应器和第二气相反应器中产品的熔体流动速率比以及第二气相反应器中氢气与乙烯的摩尔比,在总乙烯质量分数为6.81%时,K7227H的常温冲击强度提高到11.1 k J/m~2,实现了K7227H在较低乙烯含量情况下具有较高的冲击强度。     

高熔体流动速率抗冲共聚聚丙烯M30RH的开发

在环管聚丙烯(PP)装置上利用非对称外给电子体技术和直接聚合法生产了高熔体流动速率抗冲共聚PP M30RH。通过工艺改造、优化操作参数、筛选后期活性更高的DQC602型催化剂、采用使PP刚韧平衡性更好的成核剂VP-101B,实现了M30RH的大批量稳定生产。与用降解法生产的国内同类PP相比,M30RH无异味、不发黄,刚韧平衡性好,在洗衣机和汽车零部件专用改性树脂等领域得到广泛应用。     

高流动抗冲共聚PP M3000RH的合成

采用氢调法在200 kt/a国产环管聚丙烯(PP)装置上合成了高流动抗冲共聚PP M3000RH。用红外光谱仪、差示扫描量热仪、凝胶渗透色谱仪等表征了该产品的结构和性能,并与采用降解法生产的同类抗冲共聚PP做了对比。结果表明:合成的M3000RH具有良好的抗冲击性能、柔韧性能和抗氧化能力,低温简支梁缺口冲击强度达到3.4 J/m,弯曲模量达到1 402 MPa,氧化诱导期达到20.47 min。     

抚顺石化研发聚丙烯纤维料

<正>近日,抚顺石化开发出应用广泛、附加值高的高熔融指数聚丙烯(PP)纤维树脂L5D49,目前装置以35 t/h的负荷稳定生产。该公司烯烃厂30万t/a PP装置采用美国Uniplo气相法生产工艺,可生产均聚、无规共聚和乙烯含量17%的产品。在装置开车的一年多时间里,技术人员在该装置上已成功开发出应用于洗衣机缸体、汽车的高橡胶含量抗冲PP LC7749-35N等多个牌号PP产品。为进一步发挥装置的技术优势,增产高附加值     

热塑性弹性体发展动向（下）

4 技术开发动向 TPE有较大发展的主要技术因素有: (1)采用茂金属催化剂生产的乙烯共聚物改变了TPE的组成; (2)反应器工艺的改进,使橡胶组分的含量比机械共混有了明显的提高; (3)采用高乙烯含量的共聚物代替EP(D)M,高流动性PP共聚物代替PP均聚物,开发了高流动性的TPE产品; (4)采用合金技术提高了产品的性能与价格之比。 4.1 SBC 在各种TPE中,SBC的研究开发最为活跃。日本橡胶公司推出了不同于现有SEBS、SEPS的加氢丁苯橡胶Dynaron HSBR(タィナロン)。产品中不添加增塑剂和软化剂,在赋予PP以透明性及难白化性的同时,还使其具有软质化的特性,已为文具生产企业采用,用于文件     

双环管PP装置带连接堵塞原因及改进措施

在双环管聚丙烯(PP)装置上,可切换生产无规共聚PP和均聚PP产品,但无规共聚PP产品中乙烯含量过高、转产过程过快以及工艺参数控制不合适等都会导致PP装置的带连接堵塞;根据带连接堵塞的原因,从工艺参数和工艺流程两方面进行了改进。结果表明:采取降低无规共聚PP中乙烯质量分数为3. 0%～3. 5%,转产过程中乙烯含量为零时再调整给电子体加入量、适当调整装置工艺参数等措施,可保证PP装置的长周期稳定运行;在带连接的上游端加装一条冲洗丙烯的管线加快带连接内物料的流速,从而减少带连接堵塞的危险;在第二环管反应器返回第一环管反应器的带连接末端加装一个球阀,可及时地处理带连接堵塞;进一步的改进是在两环管反应器之间加装桥连接,以实现在线处理堵塞的带连接。     

气相法高抗冲产品的开发

抚顺石化公司烯烃厂30万t/a线聚丙烯气相法装置开发了一种高抗冲产品。测试结果表明:产品拥有优异的低温抗冲性能、高熔融指数和高抗冲强度、可控流变学、领先市场的高抗冲/刚度的平衡。本产品生产难度较高,第一反应器树脂为高熔指的均聚物,熔融指数为69,二甲苯可溶物1.6%,产品的最终熔融指数35。本产品以乙烯为共聚单体,橡胶含量为17%,橡胶中的乙烯含量42%,总乙烯含量7.1%。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料，介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比，介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序，对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.