耐候母粒LS-133WP在高碳酸钙填充户外用PP无纺布中的应用研究

以PP树脂和多种高效的抗老化助剂为原料,通过双螺杆挤出造粒生产工艺,开发出一种户外用高碳酸钙填充PP无纺布专用耐候母粒LS-133WP,并对其在高碳酸钙填充PP无纺布中的应用进行了研究。结果表明,2%的LS-133WP母粒添加量可显著提高高碳酸钙填充PP无纺布的耐候性能。     

防寒用聚丙烯无纺布的人工加速老化试验研究

以自制聚丙烯抗老化母粒和PP树脂为原料,通过纺黏法制备了防寒聚丙烯无纺布,并通过氙灯人工加速老化试验方法对其抗老化性能进行了研究。结果表明,制备的防寒聚丙烯无纺布具有良好的抗老化性能,可满足实际使用要求。     

聚丙烯纤维抗老化性能的研究

在聚丙烯(PP)中加入抗老化母粒SMF1807后,采用人工气候老化仪研究PP纤维的抗老化性能。结果表明:抗老化母粒SMF1807能显著提高PP的抗老化效果,使PP纤维满足户外使用的基本要求。     

阻燃PP纺粘无纺布的性能研究

研究了阻燃母粒法和整理法制得的阻燃PP纺粘无纺布的力学性能、热性能和阻燃性能。结果表明:阻燃母粒法制得的阻燃PP纺粘无纺布的断裂强力与PP纺粘无纺布的接近,但断裂伸长率要低,后整理法制得的纺粘无纺布的力学性能与PP纺粘无纺布的接近;两种方法制得的阻燃PP纺粘无纺布的热性能均优于PP纺粘无纺布,在1000℃左右时,有24.0%～33.2%的炭残渣,成炭性较好;两种方法制得的阻燃PP纺粘无纺布的阻燃性能良好,其中用阻燃剂B整理后的PP纺粘无纺布其阻燃效果优于阻燃剂A整理的PP纺粘无纺布。     

抗老化聚丙烯无纺布的应用研究进展

综述了抗老化聚丙烯(PP)无纺布的应用领域、主要老化机理及环境因素(如热、光和氧等)对其老化性能的影响,介绍了抗老化PP无纺布老化试验方法、分析研究方法和相关检测标准,并展望了其研究动向和发展趋势。     

PE基木塑复合材料的光稳定化及其耐候性能研究

以高密度聚乙烯为树脂基体,同时并采用两种自主开发的木塑专用耐候母粒对其进行光稳定化改性,制备了PE基木塑复合材料,并对其耐候性能进行了研究。结果表明,耐候母粒LS-1和LS-2均对PE基木塑复合材料有较好的抗老化作用。经1000h的氙灯加速老化后,光稳定化改性前后的木塑复合材料的拉伸性能变化不大;改性后的木塑复合材料的冲击强度保持率明显提高,色差明显减小,其中LS-2的效果更佳。     

抗老化PP扁丝编织土工布专用料的研制

选择国产基础树脂与稳定剂，采用碳弧灯和B型荧光紫外灯人工加速老化试验，研究了光稳定剂品种、用量、与抗氧剂的复配及色母粒、重钙母粒对专用料老化性能的影响。与添加Ciba精化公司MB218母粒的抗老化聚丙烯(PP)性能的对比及应用试验结果表明，PP扁丝编织土工布抗老化性能优良。     

农用聚丙烯非织造布的耐候性能研究

以PP树脂和多种高效的抗老化助剂为原料,开发了一种PP耐候功能母粒用于PP非织造布耐候改性,并通过氙灯人工加速老化试验方法对改性后的PP非织造布的耐候性能进行了研究。结果表明,经耐候改性后的PP非织造布试样具有良好的耐候性能,可满足农业领域的户外使用要求。     

高耐候PE膜的组分设计、制备及在光伏背板中的应用

以低密度聚乙烯(LDPE)和线型低密度聚乙烯(LLDPE)为主体树脂制备PE膜,利用白色母粒、抗老化母粒和氟化聚烯烃(PPA)母粒作为改性母粒,对聚乙烯(PE)膜内层中层和外层进行组分设计,研究了PE膜与聚对苯二甲酸乙二醇酯(PET)复合粘接强度、PE膜与聚乙烯-醋酸乙烯酯(EVA)热压复合强度、PE膜在光伏背板中耐紫外老化性能和耐高温高湿老化性能。结果表明,PE膜内层组分中抗老化母粒质量比为100∶6时,PE/PET复合粘接强度为8 N/10mm。外层组分中抗老化母粒质量比为100∶3,PPA母粒质量比为100∶1时,PE/EVA热压复合强度为85 N/10mm。中层组分中抗老化母粒质量比达到100∶6时,PE膜耐紫外辐照量达到120 k W·h/m~2,耐高温高湿老化时间达到3 000 h。     

粘结级PP—9203A树脂的研制及应用

PP编织包装袋在国内已成为塑料制品和包装材料的主要大类品种,PP布基经涂复或与牛皮纸复合,采用中缝粘合制袋技术是新近发展的一种新工艺。由于国产PP原料大多属通用品种及牌号,故中缝制袋粘结级PP专用料依赖于进口。本文通过对国外进口的粘结专用PP树脂(LS-620)进行性     

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。