高密度聚乙烯复合管市场分析

具体介绍了高密度聚乙烯复合管的生产线、生产厂家，并对国内外复合管材的市场现状作了详细分析     

氯化聚乙烯专用HDPE树脂的生产现状及市场分析

我国氯化聚乙烯专用HDPE树脂在质量和数量上均不能很好地满足国内氯化聚乙烯的生产的需要,文章介绍了国内的氯化聚乙烯专用HDPE树脂生产厂家、工艺、牌号及产量,对该专用树脂的市场情况、生产成本和经济效益做了分析,并对我国氯化聚乙烯专用树脂的开发和生产提出建议。     

氯化聚乙烯的发展现状及分析

论述了国内外氯化聚乙烯(CPE)的发展情况,分析了国内用于CPE生产的高密度聚乙烯(HDPE)原料的生产情况,并对HDPE原料的生产提出了建议。     

高密度聚乙烯的结构与性能分析

本文主要研究了高密度聚乙烯的性能,并对其基础性能、相对分子质量与分布情况、熔融行为、流变性能以及力学性能进行了测试和分析。通过实验,发现高密度聚乙烯在结构不同的情况下,力学性能和流变性能也有所不同,熔融行为中的稳定性和可塑性也有所差别。同时,高密度聚乙烯的相对分子质量分布的情况,能够对其实际的应用范围起到直接作用。     

国内Unipol装置聚乙烯膜料的发展概况

介绍了国内Unipol气相聚乙烯装置概况.根据Unipol装置实际生产情况,从高密度聚乙烯(HDPE)膜料、线型低密度聚乙烯(LLDPE)膜料以及茂金属线型聚乙烯(mLLDPE)膜料三个方面做了详细阐述.最后结合国内禁塑令情况,对Unipol装置膜料未来的发展提出了几点建议.     

国内外聚乙烯管材专用料的现状及分析

介绍了国内外聚乙烯管材料的发展情况,以及聚乙烯管材专用树脂的主要生产厂家及牌号,并研究分析了聚乙烯管材专用料的新产品的开发及发展方向。     

国内外聚乙烯燃气管材专用料的发展概况

介绍了国内外聚乙烯(PE)燃气管材专用料的发展情况和主要生产厂家产品的性能,阐述了燃气用埋地PE管材国内标准和国际标准与欧洲标准的差异,并结合国内的研发和生产现状,提出了我国PE燃气管材专用料的发展方向。     

双峰高密度聚乙烯树脂的开发前景

HDPE装置采用淤浆法生产高密度聚乙烯,描述了双峰高密度聚乙烯树脂的特点,介绍了双峰HDPE产品物性参数、聚合工艺和质量指标,概括了影响双峰高密度聚乙烯树脂物理性质的三个主要因素(聚合方式、所用共聚单体、所用稳定剂),阐述了双峰高密度聚乙烯树脂的研制开发前景。     

土工膜新产品创效高

近日,广东茂名石化在高密度聚乙烯装置上成功试生产出200吨合格的土工膜新产品TR400M,大大提升了高密度聚乙烯产品盈利空间。近两年,由于国内高密度聚乙烯产能大幅上升,严重打压了产品盈利空间。茂名石化把开发生产技术含量高、附加值高的产品作为着重点,以最大限度提高产品盈利能力。土工膜新产品TR400M具有密度低     

高密度聚乙烯技术进展

自1953年在低压下使乙烯聚合生成HDPE,迄今已有50多年,高密度聚乙烯的开发生产突飞猛进,技术进展突出表现在催化剂开发的进展、生产工艺技术的进展。对高密度聚乙烯的发展进行简单介绍,对当前高密度聚乙烯主要技术及特点进行说明,对其产品研发及技术发展趋势进行分析,对高密度聚乙烯的发展提供一定参考。     

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。