汽车顶棚用轻质GMT吸音性能的研究

研究了轻质玻璃纤维毡增强热塑性复合材料(GMT)板材的面密度、成型厚度、透气率以及GMT汽车内饰顶棚与钣金间隙4个因素与顶棚吸音性能的关系。结果表明,GMT汽车内饰顶棚的吸音系数受GMT板材面密度的影响不大,但随成型厚度的增加而增大;高透气率的顶棚的吸音系数在高频区最大;增加GMT汽车内饰顶棚与钣金之间的间隙可以显著提高顶棚在低频和中频区的吸音系数。     

低密度PU发泡板在汽车内饰顶棚中应用及研究

介绍了汽车顶棚的结构组成和基本性能要求,并研制出一种全新的22kg/m3的低密度PU板。通过实验比较结构不同的汽车顶棚间在性能方面的差异,低密度PU发泡板的吸音降噪、储存时间、刚性强度等性能较原先聚氨酯(PU)材料有明显提升。     

聚氨酯材料在汽车顶棚的应用

介绍了汽车顶棚的结构组成、成型工艺及基本性能要求,通过测试比较不同结构顶棚之间的性能差异,重点论述聚氨酯发泡材料对汽车顶棚的隔热保温及吸音降噪效果.     

“聚氨酯材料在轿车内饰顶棚方面的研制与应用”项目通过技术鉴定

由山东省烟台华润汽车内饰件有限公司与黎明化工研究院共同承担的国家“86 3”项目“聚氨酯材料在轿车内饰顶棚方面的研制与应用”于 2 0 0 0年 4月中旬在山东省烟台市召开了技术鉴定会。轿车自支撑复合顶棚产品采用热塑性聚氨酯泡沫材料板具有密度低、质量轻 ,有利于汽车减重 ;吸音隔热性能好 ,可降低车辆运行中的噪音并调节车内温度。这些优点是其它材料所无法取代的 ,它的质量直接影响着顶棚总成的质量。该项目通过小试研究和中间试验后 ,已造成 70 0多ｍ2的生产车间 ,至 2 0 0 0年 3月已经生产出 2万多张合格板材供用户使用 ,项目已进入…     

汽车顶棚内饰设计简介

顶棚内饰是汽车整车内饰的重要组成部分，它的主要作用是提高车内的装饰性，同时顶棚内饰还可提高与车外的隔热、绝热效果；降低车内噪声，提高吸音效果；提高乘员乘坐的舒适性和安全性。由于太阳直射车顶，汽车顶部温度较高，因此顶棚内饰的耐热性和耐候性指标要求较严。     

利用汽车内饰聚丙烯废料进行板材的研制

在粉碎后的汽车顶棚用聚丙烯废料中添加新的聚丙烯、玻璃纤维、偶联剂等通过烘干、混料、加热、压制等工艺制成板材.研究了温度、压力以及保温时间等工艺参数对板材的成型性及其力学性能的影响.结果表明,预热温度110℃、预热时间20 min、加热温度185℃、保温时间50 min、成型压力2.33 MPa时板材的压制成形性能和力学性能最佳.     

影响汽车板材粘接性能的研究进展

主要介绍了胶粘剂的性能,以及不同因素(如表面处理、胶层厚度、粘接体系的内应力、粘接接头的形状与尺寸和湿热环境等)对汽车新型轻质板材胶接件粘接性能的影响。最后对汽车新型轻质板材的粘接技术进行了展望。     

聚氨酯/聚偏氟乙烯防水透气膜的制备及性能

采用湿法相转换法制备了聚氨酯/聚偏氟乙烯(PU/PVDF)共混膜。通过扫描电子显微镜(SEM)和X射线衍射(XRD)对PU/PVDF共混膜的形貌和结构进行表征,并对PU/PVDF共混膜进行了性能测试,研究了PVDF的含量对共混膜透气性、亲水性及力学性能的影响。结果表明:添加PVDF可显著改善膜孔结构,随着PVDF含量的增多,结晶度增大;共混膜的透气性、疏水性、拉伸强度及断裂伸长率均呈先上升后下降的趋势,并在PU/PVDF比例为80/20时,各值均达到最大值,此时,透气性由1.034 L/(cm2·min)增加到6.881 L/(cm2·min),接触角由71.67°增加到92.51°,拉伸强度由1.25 MPa增加到1.56 MPa,断裂伸长率由401%增加到460%,综合性能达到最大。     

一周要闻述评

<正>(10月13日-10月17日)企业要闻关键字:万华化学杜邦索尔维空气化工半硬质聚氨酯发泡材料具有良好的力学性能、吸音隔热功能,被越来越多地用于汽车顶棚行业。万华化学(北京)有限公司始终坚持以客户需求为先导、技术创新为核心,引领技术新潮流,针对客户多样化需求,研发出了顶棚系列产品,包括聚氨酯顶棚泡沫组合料及顶棚胶水。     

双层亚麻-涤纶交织汽车座套面料的开发

基于汽车座套面料的要求,利用涤纶长丝和亚麻纱交织的方式设计了7种不同产品,并对亚麻-涤纶交织的汽车座套面料性能进行分析和评价,最终得到影响汽车用纺织品舒适性和耐用性的主要因素。结果表明:表层亚麻、里层涤纶双层交织的斜纹织物透气性、悬垂性、耐磨性、起毛起球性、抗皱性和拉伸性能等综合性能较好,是一种理想的汽车座套面料。     

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。