催化调聚法生产全氟碘辛烷的研究与改进

全氟碘代烷是生产含氟整理剂、含氟表面活性剂及其他含氟精细化学品的关键中间体,我国也因国外的垄断而几乎完全依赖进口,严重制约了我国有机氟精细化工的发展。对国外生产全氟碘代烷的方法进行分析,通过对已有催化调聚法的研究,提出了合理化的改进措施和合成工艺。     

全氟碘代烷调聚反应的机理与工艺研究进展

介绍了全氟碘代烷调聚反应的机理,对气相调聚法、催化调聚法和自由基调聚法等全氟碘代烷调聚工艺进行了评价。指出调聚法制备全氟碘代烷的关键主要在以下2个方面:提高反应器单位产出率,降低生产成本;提高终产物的选择性,减少碳10以上的调聚物和其他副产物的生成。建议把反应器分成几个列管式反应单元和精馏塔,分段进行调聚。     

市场专栏 市场分析

我国全氟烷基碘化物初显产业化曙光全氟烷基碘化物是氢原子被氟原子完全取代的单碘代全氟烷烃化合物，是生产氟精细化学品的关键中间体。全氟烷基碘化物以五氟碘乙烷为调聚剂、四氟乙烯为调聚单体进行调聚反应制得，反应一般在引发剂、高温高压及催化剂条件下进行。国际上，它由美国杜邦公司于２０世纪６０年代首先开发成功，随后原德国赫司特、法国A－tochem、日本旭硝子和大金等公司相继建成生产线。用全氟烷基碘化物生产的氟表面活性剂，种类很多，应用很广。主要表现在以下方面：一是化学工业，主要有高分子材料乳化剂、塑料橡胶制品脱…     

全氟碘烷的合成及应用前景

全氟烷基碘化物是生产氟表面活性剂及氟整理剂和其他氟精细化学品的重要中间体。我国目前尚无全氟烷基碘化物产品，故制约了下游氟产品的发展。上海中临材料公司开发的全氟烷基碘化物制备技术，填补了国内空白，本文介绍了其合成方法、应用及市场需求和前景。     

含氟中间体专利信息

一种氧化还原引发制备全氟烷基碘的调聚方法 本发明涉及一种通式为Rf(CF2CF2)nI的全氟烷基碘的调聚方法,以含氟烯烃为主链物,RfI为调聚剂.     

全氟碘烷合成技术进展与应用前景

全氟碘烷是一类重要的有机氟中间体，是生产含氟表面活性剂、含氟织物整理剂和其他含氟精细化学品的主要原料，含氟表面活性剂和织物整理作为各自领域的精英产品倍受国内外关注，具有极好的市场空间和发展前景，因此全氟碘烷化合物作为基础原料具有良好开发前景。     

全氟碘烷合成技术进展与应用前景

全氟碘烷是一类重要的有机氟中间体，是生产含氟表面活性剂、含氟织物整理剂和其他含氟精细化学品的主要原料，含氟表面活性剂和织物整理作为各自领域的精英产品倍受国内外关注，具有极好的市场空间和发展前景，因此全氟碘烷化合物作为基础原料具有良好开发前景。     

氟表面活性剂和氟聚合物(VI)——“弱位点”氟表面活性剂的合成

重点综述了潜在具有非生物累积性的氟表面活性剂的近期合成策略,包括：CF3-X-(CH2)n-SO3Na (X=O,C6H4O或N(CF3),n=8~12)的制备;通过六氟环氧丙烷(HFPO)寡聚或氟化氧杂环丁烷的开环阳离子寡聚合成含氟聚醚;偏氟乙烯(VDF)与全氟烷基碘发生调聚反应生成CnF2n+1-(VDF)2-CH2CO2R (n=2或4,R=H或NH4);3,3,3-三氟丙烯(TFP)与全氟烷基碘进行自由基调聚反应制备相应的表面活性剂;VDF与TFP在全氟烷基碘存在下的自由基共调聚,或它们在氟化黄原酸酯存在下的可控自由基共聚。进一步综述了这些含弱位点氟烷基醚物质的降解性和安全性以及作为PFOS和PFOA替代品的问题。     

热点化工产品市场与投资分析

（上接第5期第31页） 七、全氟碘烷 氟碘烷化合物是一类氢原子被氟原子完全取代的单碘代全氟烷化合物，目前具有商业价值的是碳数在6-12的全氟碘烷，其中8碳含量最为重要，其相应的产品具有极高的表面活性，是生产含氟表面活性剂、织物整理剂和其他精细化学品的关键中间体。     

萃取精馏制备高纯六氟环氧丙烷

1前言 六氟环氧丙烷（Hexafluoropropylene oxide,简称HFPO）,又称全氟环氧丙烷,是有机氟工业中重要的中间体,是合成高性能氟化工产品的关键原料。由于其特有的环状结构使其具有高度的化学活性,可用来制备多种含氟有机化合物的中间体、含氟精细化学品,如在催化剂存在下可发生自聚;在Lewis酸催化下可重排转化为六氟丙酮;与磺内酯等酰基氟化物加成反应、裂解后制备全氟烷基乙烯基醚;能与水、醇、硫酸、胺类、     

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。