高透明纳米棚模专用料在天津投产

天津石化公司研制成功纳米高透明线型低密度聚乙烯（LLDPE）棚模专用料DFDA－9086，并在聚乙烯装置上成功实现了工业化生产，产品主要质量指标均达到预期目标。     

HDPE 5000S对共混地膜质量的影响

本文阐述了大庆产高密度聚乙烯(5000S)与线型低密度聚乙烯(DFDA7042),低密度聚乙烯(1F/B)共混生产超薄地膜时,HDPE(5000S)的不同含量对超薄地膜性能的影响,并得出高密度聚乙烯(5000S)在薄膜生产中的最佳组分控制范围.     

高速自动包装膜用LLDPE专用树脂的性能

研究了高速自动包装膜专用线型低密度聚乙烯DFDA7042H的性能。DFDA7042H具有较好的流动性,熔融挤出拉伸断裂时的牵引速率较大,因而吹膜时的牵引速率较快。DFDA7042H加工工艺稳定、易于控制,成膜性能良好,薄膜透明性、开口性和综合力学性能好,是理想的高速自动包装膜专用树脂。     

影响LLDPE薄膜光学性能因素的研究进展

论述了线型低密度聚乙烯薄膜的优势,综述了加工工艺、树脂共混以及添加透明成核剂三种方式对薄膜光学性能的影响,分析比较了三种方式改善薄膜光学性能的效果,着重讨论了成核剂的作用机理,最后对高透光率、低雾度线型低密度聚乙烯薄膜成核剂的研究前景进行了展望。     

高透明纳米棚模专用料

天津石化公司研制成功高透明线型低密度聚乙烯（LLDPE）棚模专用料DFDA-9086,并在聚乙烯装置上成功实现了工业化生产,产品主要质量指标均达到预期目标。     

国内外高透明聚乙烯薄膜专用料生产技术现状

论述了聚乙烯薄膜雾度产生的机理和影响因素,综述了国内外聚乙烯生产企业和研究单位通过改变共聚单体类型、改变催化剂体系、优化助剂配方、优化加工工艺生产高透明聚乙烯薄膜专用料的方法,通过对比发现,优化助剂配方和优化加工条件生产高透明聚乙烯薄膜专用料,操作简单灵活,不需要对工业化生产装置做大的改动,是高透明聚乙烯薄膜专用料最容易工业化推广的方法,为高透明线性低密度聚乙烯(LLDPE)薄膜专用料的开发提供技术参考。     

LLDPE装置棚膜专用料DFDA9042的开发

通过调整聚合工艺条件,在造粒过程中添加自主研发的有机成核剂与无机成核剂复配的复合助剂,生产出高透明的棚膜专用料DFDA9042,产品雾度小于14%。经加工试验膜的透明性能提高,其他机械性能良好。     

天津分公司成功开发高透明纳米棚模专用树脂

中国石油化工股份有限公司天津分公司（简称天津分公司）研制成功纳米高透明线型低密度聚乙烯（LLDPE）棚模专用树脂DFDA-9086，并在聚乙烯装置上成功实现了工业化生产．产品主要质量指标均达到预期目标。     

高开口型线形低密度聚乙烯的性能研究

研究了高开口型线形低密度聚乙烯（PE-LLD）DFDA7042H的物理性能、相对分子质量、支化度和流变性能,并对其生产的薄膜产品的性能进行了测试,且与市场认可的进口产品进行了对比。结果表明,与进口产品相比,工业化生产的DFDA7042H物理性能大致相同,相对分子质量稍高,相对分子质量分布较宽;DFDA7042H的剪切应力和剪切黏度更低,适合在较低的温度下加工;DFDA7042H吹制的薄膜的动摩擦因数与进口产品接近,开口性较好;同时薄膜的雾度较低,具有更高的透明性,其他性能与进口产品接近,能够满足高速包装膜使用要求。     

透明易加工LLDPE的结构与性能

分别以自制透明易加工线型低密度聚乙烯(LLDPE)(简称TEP-LLDPE)与LLDPE DFDA 9047为原料,经挤出机熔融吹膜制备了LLDPE膜,采用差示扫描量热仪、凝胶渗透色谱仪、电子万能试验机、雾度仪和旋转流变仪等研究了TEP-LLDPE与DFDA 9047的结晶行为、流变行为、热性能以及相应膜的力学性能、光学性能等。结果发现:TEP-LLDPE膜具有较好的力学性能,且光学性能、加工性能得到改善。最后简要分析其各项性能得到改善的原因。     

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。