共混型聚丙烯/超细粉末丁苯橡胶全硫化热塑性弹性体的制备及其结构与性能

以全硫化超细粉末丁苯橡胶(PSBR)与聚丙烯(PP)为原料,采用双螺杆挤出机共混方法制备PP/PSBR全硫化热塑性弹性体。通过透射电镜观测,发现PP/PSBR全硫化热塑性弹性体具有和动态硫化方法制备的热塑性弹性体相似的微观形态,PSBR粒子作为分散相分散在连续相PP中;所制备的热塑性弹性体的力学性能与PP的相对分子质量、共聚与否、PSBR含量及其交联度有关;通过流变行为研究,发现此类全硫化热塑性弹性体为假塑性流体,且橡胶的含量对热塑性弹性体的黏度影响很小;采用差示扫描量热法对PP/PSBR全硫化热塑性弹性体中连续相PP的结晶行为进行了研究,发现连续相PP的结晶温度提高,表明PSBR对PP有异相成核作用。     

聚烯烃热塑性弹性体新工艺通过鉴定

由湖北大学开发的聚烯烃热塑性弹性体制备新工艺,日前通过湖北省科委组织的专家鉴定。　　热塑性弹性体不仅具有热固性橡胶的弹性,还具有塑料的高强度,可替代热固性橡胶用于汽车、电线电缆等领域。湖北大学采用动态混合静态硫化聚丙烯共混的方法,有效地控制了相态结构,使橡胶粒子均匀分散于塑料相中,解决了此类弹性体制备中的关键技术问题,并已完成了２个系列４个牌号材料的批量试制。聚烯烃热塑性弹性体新工艺通过鉴定     

微纳层叠共挤对EPDM/PP热塑性弹性体力学性能的影响

利用自制的微纳层叠共挤成型装备预制EPDM/PP多层复合材料,通过动态硫化制备共挤和共混2种EPDM/PP热塑性弹性体,测试EPDM/PP热塑性弹性体的力学性能,并利用扫描电子显微镜观察EPDM/PP热塑性弹性体相态结构。结果表明:共挤法能够明显减小橡胶相颗粒粒径的大小,且粒径均匀,并提高了橡胶相颗粒的分散均匀性,共挤法制备的EPDM/PP热塑性弹性体的力学性能总体优于共混法。     

北京化工研究院粉末橡胶中试装置试车成功

中石化北京化工研究院开发的具有自主知识产权的专利产品——超细全硫化粉末橡胶，可用于各种塑料增韧和制备新型全硫化热塑性弹性体，具有独创的增韧改性效果。将其用于制备全硫化热塑性弹性体时，工艺简单，成本低廉，产品性能可与国外动态全硫化法热塑性弹性体相媲美。据悉，该院500t/a超细全硫化粉末橡胶中试装置已建成并顺利试车成功。 北京化工研究院粉末橡胶中试装置试车成功     

共混型动态硫化热塑性弹性体的开发与应用

共混型动态硫化热塑性弹性体的开发与应用共混型动态硫化热塑性弹性体（ＴＰＶ）是国际上８０年代开发出来的一类新型弹性体材料。这种由橡胶与热塑性树脂共混所制得的材料，在制备过程中，橡胶混人树脂基料中，再与交联剂及其它化学助剂一起混炼，橡胶相产生高度的交联，...     

中国专利

橡胶硫化促进剂CBS的造粒新工艺及其设备;粘接复合材料用改进型黏合剂;有机硅烷母炼胶;动态硫化阻燃三元乙丙橡胶／聚丙烯热塑性弹性体;热塑性弹性体组合物及其橡胶辊;复配硅烷偶联剂的制备方法和用途;轮胎用橡胶组合物;无臭味轮胎再生橡胶及其制备方法;一步法硅烷交联乙丙橡胶的制备方法;轮胎用橡胶组合物以及用其生产的充气轮胎;聚丙烯树脂组合物的制备方法及其注塑制品;特定二氧化硅作为增强填料的轮胎用二烯烃橡胶组合物。     

废旧胶粉/聚丙烯---热塑性弹性体的研究进展

文章主要介绍了国内外热塑性弹性体的研究发展及使用,并针对现阶段的研究现状,重点阐述了废旧橡胶/聚丙烯共混制备热塑性弹性体的研究与发展。通过对研究中的硫化体系,改性方法,共混方法的分析,并从界面粘合的角度综合考虑了各因素对共混结果的影响,提出了较为适合废旧胶粉/聚丙烯最适宜的制备热塑性弹性体的加工方法以及加工条件,剖析了聚丙烯/废旧胶粉作为热塑性弹性体的可行性及使用优势。     

动态硫化NBR/CPE/EVA热塑性弹性体的研制

为了获得一种耐热油，弹性好，强度高，橡胶感强，易加工的油封材料，我们采用动态硫化法制备了共混型NBR／CPE／EVA热塑性弹性体，系统讨论了橡塑并用比，硫化温度和硫化时间对热塑性弹性体的凝胶含量及力学性能的影响。结果表明：在一定温度和时间范围内，硫化温度升高和硫化时间延长，热塑性弹性体的凝胶含量增大，随着热塑性弹性体中EVA用量增大，弹性体的拉伸强度，赵氏硬度和拉伸永久变形有增大。     

改性胶粉/EPDM/PP热塑性弹性体的制备与性能研究

以乙丙橡胶(EPDM)、聚丙烯(PP)和胶粉等为主要原料,采用动态硫化的方法制备了改性胶粉/EPDM/PP热塑性弹性体,研究了溴化丁基橡胶(BIIR)用量、胶粉的改性剂、热塑性弹性体的硫化剂对改性胶粉/EPDM/PP热塑性弹性体力学性能和耐老化性能的影响,并通过电子扫描电镜观察了热塑性弹性体内部的微观结构。研究结果表明,BIIR用量为12份时,热塑性弹性体的力学性能最优,耐老化性能良好;使用10份松香、6份50%大蒜汁、2份BIIR并用作为改性剂改性的胶粉所制备的热塑性弹性体力学性能最优,耐老化性能良好;使用促进剂TT、硫黄和201树脂并用作为硫化剂所制备的热塑性弹性体力学性能和耐老化性能最优;经过松香、50%大蒜汁和BIIR改性后的胶粉与橡胶基体以及聚丙烯间相界面比较模糊,分散均匀性较好。     

我国聚烯烃类热塑性弹性体需求将持续增长

聚烯烃类热塑性弹性体（TPO／TPV）指橡胶与聚烯烃共混，无需硫化即可成型加工的一类热塑性弹性体材料。通常橡胶组分为二元乙丙橡胶、三元乙丙橡胶、丁腈橡胶和丁基橡胶；聚烯烃组分主要为聚丙烯和聚乙烯。它具有良好的物理性能和耐候性能，近年来在汽车、电子电气、建材、     

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。