硅橡胶喷涂产品的喷涂工艺及质量管控

研究硅橡胶喷涂产品的喷涂工艺,分析喷涂现场的过程质量管控要点。试验确定的硅橡胶喷涂产品最佳喷涂工艺参数为：喷枪喷嘴出口直径　0.5 mm,喷涂压力　0.7～0.8 MPa,走枪速度　40～60 cm·s^-1,喷涂距离　20～25 cm。喷涂现场的过程质量管控包括喷涂前准备环节、喷涂施工环节、喷涂后硫化环节的管控。喷涂施工环节的工序包括待喷涂工件的清洁、非喷涂部位的包裹、喷涂工艺的确定、喷涂后自检和消缺。总结出每个环节的质量管控要点,从而提高硅橡胶喷涂产品的涂层质量。     

涂装节能喷涂设备的运用

如何正确选择喷涂设备,使我们的涂装更加节能、高效和完美,首先就要了解喷涂设备的分类及各自特点。本文详细介绍了空气喷涂设备、高压无气喷涂设备、空气辅助无气喷涂设备、高效低压喷涂设备和静电喷涂设备等五类流体喷涂设备的功用特点与结构原理。     

涂装节能喷涂设备的运用

如何正确选择喷涂设备,使我们的涂装更加节能、高效和完美,首先就要了解喷涂设备的分类及各自特点。本文详细介绍了空气喷涂设备、高压无气喷涂设备、空气辅助无气喷涂设备、高效低压喷涂设备和静电喷涂设备等五类流体喷涂设备的功用特点与结构原理。     

非常规等离子喷涂技术及其特点分析

本文简要介绍了反应等离子喷涂、微束等离子喷涂、层流等离子喷涂和电磁脉冲辅助-等离子喷涂等几种非常规等离子喷涂技术的原理、特点和研究现状.通过这几种非常规等离子喷涂技术特点分析,以期从中获取对未来等离子喷涂工艺发展的一些启示.     

浅谈喷涂机器人外板喷涂参数设定

通过对外板喷涂参数收集、整理、分析,研究喷涂参数与机器人喷涂扇幅、喷涂速度、重叠率、涂料固体含量之间的关系,总结出外板喷涂机器人喷涂参数的设定规律,以便在工艺调试阶段快速应用,减少调试时间。     

浅谈影响民用飞机零件喷涂质量的因素

针对影响漆膜质量的喷涂人员、喷涂设备、所用材料、喷涂工艺、喷涂环境五个要素展开分析论述,剖析了提高民用飞机零件喷涂质量的工艺要点。     

提升汽车涂装内板喷涂自动化的方法

在免中涂喷涂工艺中,内板只喷涂色漆层和清漆层,因此对涂层厚度、涂料喷涂参数和机器人喷涂轨迹编辑的要求更高。本文通过考察珍珠白色漆内板喷涂调试过程,从材料特性与喷涂参数匹配性,喷涂轨迹开、关枪设置与轨迹运行速率协调性,以及机器人节拍与喷涂运行时间的关系进行探究,梳理出一套提升汽车内板喷涂自动化水平的方法。     

喷涂施工技术的发展和今后的动向

本文面对21世纪,就“环境与耐火材料”这个主题,介绍了喷涂施工技术的发展历史,各种喷涂料,密闭式喷涂机,敞顶式干式喷涂机,连续加湿机及其应用,并重点介绍了新喷涂技术,如湿式叶涂机和半湿式喷涂施工法、高温喷涂施工法、可塑料喷涂施工法、可塑料喷涂施工法、保温材料喷涂施工法和喷涂机器人的使用情况。同时还预测了将来的喷涂技术的发展趋势。     

舱体内隔热层自动喷涂技术的改进

[目的]舱体内双组分轻质有机硅隔热涂料TR-37的自动喷涂状态及涂层厚度均匀性有待提高。[方法]探讨了喷涂黏度、喷涂间隔和喷涂扇幅对喷涂状态和涂层厚度的影响。采用舱段模拟件进行了自动喷涂厚度均匀性验证,并分析了表面凹凸不平、局部涂层厚度超差、边缘区域存在喷涂阴影等缺陷的改进措施。[结果]当涂料喷涂黏度为26～28 s,喷涂间隔为30 min,喷涂扇幅为100～150 mm时,可保证优良的喷涂状态及涂层外观品质。[结论]本研究为持续提升内隔热层喷涂效率及涂层外观品质提供了参考。     

等离子喷涂技术研究现状

概述了等离子喷涂的基本原理,并介绍了大气等离子喷涂、超音速等离子喷涂和低压等离子喷涂3种常用的等离子喷涂技术。综述了该技术在制备保护性涂层、功能性涂层以及零件修复强化方面的应用,展望了等离子喷涂技术未来的发展趋势。     

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。