不同前处理工艺对车架电泳涂膜耐腐蚀性的影响研究

针对车架涂装生产线的热轧钢板涂膜性能进行研究，比较了薄膜前处理工艺与传统磷化工艺分别配套底面合一阴极电泳涂料的机械性能及防腐性能，并针对车架线涂装的热轧钢板研究比较了不同前处理方式对其耐中性盐雾性能的影响。结果表明：热轧钢板在按照一定前处理方式处理的情况下，薄膜前处理工艺可满足车架涂装的产品技术要求。     

薄膜前处理技术的应用研究

介绍了一种应用于电泳涂装前处理过程、满足节能环保要求的薄膜前处理工艺。着重介绍了薄膜前处理工艺的特点及现场工艺参数、质量控制要求,并制板进行涂膜性能试验验证。试验结果表明：薄膜前处理工艺具有稳定的工艺性能和膜层性能,检测结果接近或达到磷化处理要求,能够满足阴极电泳配套的技术要求,该工艺可以在汽车、零部件以及家电阴极电泳涂装前处理中推广使用。     

汽车车架涂装前处理工艺研究

介绍了车架电泳涂装前处理的工艺:即钢板酸洗、工序防锈、脱脂、表面调整、磷化。并分析了不同前处理工艺对涂装效果的影响,总结了车架电泳涂装前处理的优缺点。     

涂装薄膜前处理研究

薄膜前处理是涂装前处理过程中替代磷化的一种绿色环保前处理工艺,薄膜成相比于传统磷化成膜更细密更薄,其防腐性能在国内尚未经过市场的长期验证.本文针薄膜前处理工艺技术进行初步探究,包含配套电泳后的产品性能研究及对线体的设计、设备需求及线体工艺维护的研究.     

浅谈传统磷化与薄膜前处理的应用

近些年,随着无磷前处理技术的不断发展和进步,越来越多的整车电泳涂装选择了无磷前处理工艺。重点介绍了传统磷化工艺、过渡磷化工艺、薄膜前处理工艺在汽车电泳行业中的发展与应用。     

锌锰系磷化工艺的研究

介绍了一种应用于电泳涂装前处理过程,满足无镍要求的锌锰系磷化工艺。采用SEM(扫描电子显微镜)、XRD(X射线衍射)等手段研究比较了无镍磷化膜与普锌磷化膜的性能,并通过各种测试手段研究了磷化膜与阴极电泳的配套性能。结果表明:无镍磷化优于普锌磷化,并能够满足阴极电泳配套的技术要求,此无镍磷化膜结晶晶体呈粒状,晶粒尺寸为2～5μm,磷化膜质量在1.5～3.0 g/m2之间,"P比"大于85%,阴极电泳溶出率较低,可以通过抗冲击性能,耐盐雾性能测试。实际应用显示,该工艺具有稳定的工艺性能和膜层性能,可以在阴极电泳涂装前处理中推广使用。     

传统磷化转锆系薄膜前处理的前期工艺试验

锆系薄膜或硅烷薄膜前处理在国内主机厂已有部分应用,但多数为新建薄膜线,直接按薄膜工艺规划并使用,而对老线由传统磷化转为锆系薄膜前处理的研究甚少。为研究工厂传统磷化转薄膜前处理的可行性,降低转换带来的风险,本文设计了一系列实验,结合工厂现有电泳漆和车身板材,通过对泳透力、上电电压、停线性能、电泳入槽方式、打磨印遮盖等的研究,验证薄膜前处理与电泳漆以及车身板材的配套性能。通过实验结果评估薄膜前处理的使用对工艺参数、外观质量等方面的影响,为进行传统磷化转薄膜前处理工作打好基础。结果表明:薄膜前处理工艺对停线时间较为敏感,但其他工艺参数波动对其影响不大,并且在泳透力及电泳成膜的表现上也优于传统磷化。     

磷化液中金属离子的分析

0 引言 磷化作为金属涂装前处理工艺,已经得到广泛的应用.磷化工艺以前主要以锌系、钙系、锰系或锌-钙、锌-锰系二元磷化体系为主.随着涂装对表面处理质量要求的提高,三元磷化开始在阴极电泳中广泛应用.它能显著提高涂层的附着力,改善磷化膜质量,增强涂层的耐蚀性能.     

粘接钕铁硼永磁材料阴极电泳涂装前处理工艺研究

探索了阴极电泳涂装前处理工艺,讨论了封孔对磁体耐蚀性能的影响及磷化、钝化工艺对磁体漆膜耐蚀性能的提高,用盐雾试验、湿热加速腐蚀试验对各工艺的阴极电泳涂层耐蚀性能做了比较。实验表明封孔有利于提高漆膜耐蚀能力。确定了耐蚀性能好的阴极电泳涂装前处理工艺为:磁体→封孔→水洗→固化→磷化→水洗→电泳→水洗→烘烤,根据本工艺,采用自制钕铁硼专用阴极电泳涂料对磁体进行阴极电泳涂装,可以获得高耐蚀性能的防腐涂层:耐盐雾400h以上,耐湿热1200h以上,耐盐水浸泡120h以上。     

薄膜前处理工艺性的研究

以冷轧钢板、热镀锌板、铝板为基材,研究了薄膜前处理在不同工艺条件下的水洗效果、线体异常及镀锌板打磨对涂膜质量的影响。并配套两种阴极电泳漆对异常停线后的涂膜质量和电泳后遮盖性进行验证和分析,为其应用提供建议。     

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。