新型汽车密封胶用聚醚多元醇的合成及其应用

以丙二醇和甘油为混合起始剂,合成了一种新型汽车密封胶用聚醚多元醇,并与二苯基甲烷二异氰酸酯反应合成了聚氨酯预聚体密封胶,探讨了催化剂、温度等因素对聚醚多元醇及预聚体的影响。结果表明,此聚醚多元醇反应活性比传统三官能度聚醚更稳定,降低了预聚体的聚釜风险,并提高制品的拉伸强度和断裂伸长率。     

单组分硅氧烷改性聚氨酯密封胶的研制

为提高单组分聚氨酯(PU)密封胶的力学性能,以混合聚醚多元醇和甲苯二异氰酸酯(TDI-80)为原料,先制得预聚体,然后采用有机官能性硅烷(A-1100)对其进行封端,最后配以各种助剂和填料制得了单组分硅氧烷改性PU密封胶。探讨了二元醇与三元醇的比例、封端剂及增塑剂的用量对密封胶性能的影响。研究结果表明,当二元醇与三元醇的质量比为1∶1～3∶2、封端剂的用量为3%～12%和增塑剂的用量为20%￣25%时,改性后的密封胶力学性能较佳。     

高弹性改性聚醚密封胶的制备与密封性能研究

使用聚醚二元醇等材料实现封端,制备硅烷封端聚醚预聚体,将该预聚体作为基础制备高弹性改性聚醚密封胶。通过试验确定吸附剂用量,分析温度对密封胶弹性影响以及密封胶的固化性能。研究不同湿度下密封胶的吸水率变化,并测试密封胶的粘结性能。试验结果显示,多孔二氧化硅吸附剂能够提升硅烷封端聚醚预聚体性能;密封胶所处环境温度越高,弹性模量呈现下降趋势,弹性恢复率没有出现明显变化;周围环境湿度的增加能够提升密封胶吸水性,使得密封胶不易开裂,养护28 d的密封胶在粘结金属材料和陶瓷材料时密封效果更好,密封性能更高。     

环保型封端水性聚氨酯的合成

以聚醚多元醇和2,4-甲苯二异氰酸酯（TDI）为基本原料,以异丙醇为稀释剂、亚硫酸氢钠为封端剂,用预聚体—封端混合法,合成了封端型水性聚氨酯。通过讨论异氰酸酯指数R值、预聚温度、预聚时间、封端剂用量、封端温度和封端时间等因素对封端型水性聚氨酯性能的影响,确定R值2.0,预聚反应温度和时间（63℃,2h）,封端的温度和时间（0～5℃,30min）以及封端剂的用量(n_NaHSO3)/n_NCO=2.75)为最佳工艺。     

中空玻璃用单组分聚氨酯密封胶的制备及应用

以4,4′-二苯基甲烷二异氰酸酯(MDI)和聚醚多元醇制备了单组分聚氨酯预聚体。按照配方量将预聚体、填料、增塑剂、偶联剂和催化剂等物质混合,经真空搅拌得到单组分聚氨酯密封胶。单组分聚氨酯密封胶与第1道密封材料(丁基密封胶)的相容性良好。用该密封胶与底涂剂配套使用时,对玻璃和铝具有良好的粘接效果。     

硅烷封端聚氨酯预聚体的合成研究

以聚醚二元醇、二异氰酸酯为主要原料合成了硅烷封端聚氨酯预聚体,使用合成得到的预聚体制备了硅烷封端聚氨酯密封胶并对其性能进行了考察。研究了二异氰酸酯类型,NCO/OH比例,反应温度,扩链剂类型及封端剂类型对硅烷封端聚氨酯(SPU)的影响。结果表明:使用两种混合二异氰酸酯,NCO∶OH=1.3～1.5,二甘醇作为扩链剂,γ-巯丙基三甲基硅烷(KH590)作为封端剂,反应温度85℃制备得到较理想的预聚体,可使硅烷封端聚氨酯密封胶拉伸强度达到1.78MPa,断裂伸长率达到490%。     

单组分硅烷化聚氨酯密封胶的研制

通过改变SPU预聚体合成的工艺条件、原材料及配比,对单组分硅烷化聚氨酯密封胶的机械性能进行研究。结果发现:在600℃左右,4000分子量的聚醚与MDI反应,再用自制的LZ001偶联剂进行封端,在NCO/OH=1.5-1.8的范围内得到的预聚体,给密封胶带来很好的机械性能。     

封端型聚氨酯预聚体新品投产

<正>山东宇龙高分子科技有限公司自主研发的新产品——二苯基甲烷二异氰酸酯(MDI)与聚醚多元醇反应后用化学封端保护的聚氨酯(PU)预聚体,目前已在龙口投入批量生产。封端型聚氨酯预聚体具有储存稳定、运     

封端型聚氨酯预聚体投产

山东宇龙高分子科技有限公司自主研发的二苯基甲烷二异氰酸酯（MDI）与聚醚多元醇反应,用化学封端保护的聚氨酯预聚体日前投入批量生产。     

封端型水性聚氨酯抗起毛起球整理剂的合成及应用

采用NaHSO3封端异佛尔酮异氰酸酯和聚多元醇反应的聚氨酯预聚体,合成了封端型水性聚氨酯（WBP U）;讨论了WBPU对织物整理后起毛起球性的影响,并优化了织物整理工艺。     

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.     

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.     

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。     

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.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.