催化剂对BOPP专用树脂微观结构的影响

通过对催化剂的筛选、试验,成功地用单环管反应器生产出双向拉伸聚丙烯(BOPP)专用树脂。BOPP专用树脂的熔体流动指数3.0 g/10 min,等规指数(96.0±0.5)％,屈服拉伸强度96 MPa,悬臂梁冲击强度34.J/m,断裂伸长率900％～910％,分子量分布在5.0左右;在拉伸速率为250～280 m/min时,用其拉伸的薄膜均匀,破膜次数平均3～4次/天。     

催化剂对BOPP专用树脂微观结构的控制

通过对催化剂的筛选、试验,成功地用单环管反应器生产出双向拉伸聚丙烯(BOpP)专用树脂.BOPP专用树脂的熔体质量流动速率为3.0 g/10min,等规指数为(96.0±0.5)%,拉伸屈服强度为32 MPa,悬臂梁冲击强度为34J/m,断裂伸长率为900%～910%,摩尔质量分布为5.0左右;在拉伸速率为250～280 m/min时,用其拉伸的薄膜均匀,极少破膜.     

BOPP专用树脂T38F结构分析与改进

对兰州石化调整工艺前后的双向拉伸聚丙烯(BOPP)专用树脂T38F,以及湖南长盛的T38F,从等规度、分子量及分子量分布、结晶性等方面进行分析对比,找出兰州石化调整工艺前的双向拉伸聚丙烯(BOPP)专用树脂T38F成膜过程中容易破膜原因,调整工艺后,控制等规度:95%左右,分子量分布5.0左右,明显比以前窄,控制重均分子量1万以下的含量在2%~3%,成功解决了破膜问题,表明了兰州石化公司生产的T38F的成功开发与应用。     

BOPP专用树脂WH-T 36 F的质量改进

根据装置近两年的生产情况,对影响双向托伸聚丙烯(BOPP)专用树脂WH-T 36F质量指标的因素(等规指数、熔体流动指数、灰分)进行了分析。经过优化操作,选用产品等规指数易调的催化剂与高效复合抗氧剂．有效地提高了BOPP专用树脂的质量,使等规指数控制在95％～96％,灰分明显下降至170～200μg／g。     

BOPP烟用包装膜专用树脂结构性能研究

对气相法聚丙烯生产的双向拉伸聚丙烯(BOPP)烟用包装膜专用树脂F 1002进行了结构性能研究。研究结果表明，烟用包装膜专用树脂具有特征性分子量及其分布，即既含有较高的分子量组分，又含有适量低分子量组分，从而保证其在双向拉伸成型工艺中具有较高的熔体强度及熔体流动稳定性，使得制品厚度均匀性优异。同时，适宜的等规指数(96．5％～97．5％)及其等规序列分布特性，使采用均聚型烟用包装膜专用树脂加工成型的BOPP薄膜具有挺度高，满足烟用包装膜的特性要求。     

气相法工艺BOPP专用树脂的开发和生产

介绍了新一代适宜高速膜生产线的双向拉伸聚丙烯产品F3002，F2002，通过调整聚合工艺条件和对产品内在结构的性能分析，找到了提高膜专用树脂成膜性的技术关键，摸索出了生成超大分子量的可靠控制方法。F3002，F2002的熔体流动指数分别为2．4－3．0，2．0－2．4g/10min，屈服拉伸强度大于等于29MPa，等规指数为95．5％－97．5％，产品适宜于线速300m/min以上的双向拉伸薄膜生产线。     

聚丙烯新型BOPP专用料EP3T46F的开发

介绍茂名乙烯公司在聚丙烯车间近年先后开发的三种BOPP聚丙烯原料（T36F、T46F、EP3T46F的主要工艺控制参数和产品性能；通过对比，说明工艺参数的调整对产品结构和性能改进的影响关系。     

BOPP消光膜专用树脂DGDA6097M的开发与应用

在大庆石化公司全密度聚乙烯一套装置(FDPE1)上采用Unipol气相法工艺、己烯-1为共聚单体生产BOPP消光膜专用树脂,牌号为DGDA6097M。DGDA6097M的熔体流动速率(121.6)为9～13g/10min,密度为0.948～0.952 g/cm~3,拉伸屈服应力大于或等于20 MPa,断裂标称应变大于或等于350%。与相同工艺的通用薄膜专用树脂——DFDA7042相比,DGDA6097M树脂的密度高、拉伸强度大,强度优势明显;与高强度薄膜专用树脂DGDB 6097相比,雾度好。DGDA 6097M产品在金田公司进行了消光膜放大试验,加工应用表明DGDA6097M生产的消光膜制品各项指标均相当或好于某进口对标产品。     

NA-Ⅱ型催化剂生产BOPP专用树脂的工业应用

研究了在气相聚丙烯工艺装置用NA-Ⅱ催化剂和进口催化剂生产的双向拉伸聚丙烯（BOPP）专用树脂性能,并与高速BOPP树脂F280S进行了比较。结果表明,NA-Ⅱ催化剂生产的BOPP专用树脂物理性能符合优级品标准,雾度及弯曲模量好于进口催化剂生产的BOPP专用树脂;相对分子质量及其分布与进口催化剂生产的BOPP专用树脂相当,与F280S有明显区别。     

BOPP 薄膜专用树脂的质量改进

通过改变双向拉伸聚丙烯(BOPP)薄膜专用树脂的等规指数,调整工艺路线,改变分子结构降低聚合物结晶度,调整添加剂的配方等措施,使BOPP薄膜专用树脂质量不断提高。开发的第四代BOPP薄膜专用树脂的拉伸性能、韧性、光泽、透明度、颜色稳定性及加工稳定性好。产品的线速度达到350m/min以上,在高速线上连续生产1周以上产品不破膜;与国内同类产品相比,颜色和物理机械性能更具优势。     

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。