370L气动上顶栓密炼机的大修

使用多年的370 L气动上顶栓密炼机压砣、压料装置、加料装置及后密炼机存在一定问题.本文介绍了该密炼机存在的问题分析及大修方法.     

神钢F－270密炼机的大修──第二部分 密封装置

密封装置是密炼机的关键部件，神钢Ｆ—２７０密炼机微量油密封装置由于所用材料特殊，机加工精度高，是大修中的一大难题。文章介绍了对微量油密封装置大修时所做的工作，包括：分析修前故障，并制定了相应的调查路线；分析拆卸难点，制定具体的拆卸步骤；立足国内，对易损件进行修复和更新制造。文章指出，装配调整时应注意密封压力和润滑油注入量的调整，严格控制转子轴承的轴向间隙，以确保恢复密封装置原有精度和性能。     

神钢F－270密炼机的大修──第三部分 卸料装置

文章简要介绍了神钢Ｆ─２７０密炼机卸料装置大修时做的几项工作，包括调查该部分的技术状态并制定了相应的调查路线；拆卸步骤、测绘易损件、对关键零件进行修复制作，进行电路修改设计；最后指出装配调整应注意事项。     

神钢F—27—密炼机的大修

密封装置是密炼机的关键部件，神钢Ｆ－２７０密炼机微量油密封装置由于所用材料特殊，机加工精度高，是大修中的一大难题。文章介绍了对微量油密封装置大修时所做的工作，包括：分析修前故障，并制定了相应的路线；分析拆卸验点，制定具体的拆卸步骤；立足国内，对易损件地修复和更新制造。文章指出，装配调整时应注意密封压力和润滑油注入量的调整，严格控制转子轴承的轴向间隙，以确保恢复密封装置原有精度和性能。     

神钢F－270密炼机的大修──第四部分 转子与混炼室

本文简要介绍了神钢Ｆ－２７０密炼机转子、混炼室部分的结构特点及大修时所做的工作，包括：分析修前故障，制定相应的调查路线；分析拆卸难点，制定具体的拆卸步骤；立足国内对零部件进行修复更新改造以及大修理技术标准的制订。     

大孚攻下F270密炼机大修关

大孚攻下Ｆ２７０密炼机大修关邵家明编者按：十年来，我国橡胶行业引进Ｆ２７０以上大型密炼机近百台，现已陆续进入大修期。如何解决引进设备的大修问题，对企业来说，确是一个难题，也是一次考验。本刊于１９９５年第２１期报导了东风轮胎厂对德国ＧＫ３００密炼机大修...     

国产GK400型密炼机的大修

介绍GK400型密炼机大修的安全、组织和技术三要素。安全要素包括人身安全管控、动火安全措施、高处安全作业管理和起重作业监控等。组织要素包括大修人员的合理调配和施工安排。技术要素包括整机和各部件,尤其是密炼室和转子的检测、拆解、安装技术要求和操作规范。经空转试车和负荷试车检验证明大修后的GK400型密炼机各项性能合格,已投入生产。     

神钢F—270密炼机的大修：第四部分 转子与混炼室

本文简要介绍了神钢Ｆ－２７０密炼机转子，混炼室部分的结构特点及大修时所做的工作，包括；分析修前故障，制定相应的调查路线；分析扩卸难点，制定具体的拆卸步骤，立足国内对零部件进行修复更改造以及大修理技术的制订。     

GK270型密炼机组的大修

通过对GK270密炼机的大修，提高了该型密炼机的开机率和设备满足工艺性能的能力，使该机使用水平上了一个新台阶。另外结合本厂2种密炼机——F型和GK型的设备大修，取得了一些关键技术尺寸和参数，积累了经验。     

引进GK270N密炼机的大修

本文介绍了成山橡胶集团公司对引进ＧＫ２７０Ｎ密炼机的大修情况,主要对转子、上顶栓、耐磨板进行了修理,重新设计、制造了电控系统。通过大修,不仅基本上恢复了原机应有功能,还为企业节约了大量资金。     

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.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

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.     

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.     

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。