钢—热塑性树脂界面之间粘合的耐水性研究

研究钢/粘合剂/聚乙烯层状复合材料在自来水中的耐水性能。使用两种钢基材进行比较;一种未经任何表面处理(So),另外一种经过磷酸化表面处理(S_1)。粘合剂是聚乙烯接枝马来酸酐(PE-g-MAH)。采用剥离强度测试来定量分析钢/粘合剂/聚乙烯之间的粘接性能。结果表明,经磷酸化处理的层状物的耐水性好。     

聚四氟乙烯板材粘接技术的研究

本文详细介绍了用化学填料法对聚四氟乙烯板材表面进行处理、粘接的工艺技术，着重研究超细微粒填料的制备、最佳配方的确定和粘接剂的选择，用本文介绍的技术，可达到以主要技术指标为：用氯丁橡胶型粘接剂，对聚四氟四烯与金属粘接，其180°剥离强度≥1.5kg/cm;用环氧型粘接剂，对聚四氟乙烯与金属粘接，其剪切强度≥40kg/cm^2，有效存放期半年以上，羟基分布均匀性良好。     

聚四氟乙烯表面处理与粘接

分析聚四氟乙烯（PTFE）难粘接的原因，介绍化学处理法、高温熔融法、辐射接枝法、低温等离子体处理法等PTFE常用的表面处理方法，以及PTFE常用的表面改性剂和粘接性能优良的新型PTFE粘接剂。     

聚四氟乙烯的表面处理与粘接

本文介绍了聚四氟乙烯PTFE的表面处理方法、表面改性剂以及与聚四氟乙烯粘接性能优良的粘接剂     

浅谈PVC溶胶与合成纤维的粘接

介绍了一种用于PVC溶胶的直接粘接剂－Vulcabond，其可以改进PVC塑料溶胶与聚酯、尼龙和其它合成纤维产品的粘接性，并详细介绍了它的使用方法和影响粘接的各种因素。     

使氟树脂粘接强度提高两倍的方法

使氟树脂粘接强度提高两倍的方法葛宜妹（邮电部第五研究所，四川成都，６１００６２）日本都市大学Ｍｕｒｈａｒａ教授领导的一个研究小组开发了一种可以使氟树脂粘接强度提高两倍的技术。在特氟隆表面上喷洒２％的硼酸溶液以后用选择性激光对表面进行改性处理。再与环氧...     

树脂预浸润技术(RPC)增强钢塑复合管道层间粘接性能研究

围绕钢塑复合管道材料中钢和塑料粘接界面的性能强化,提出在喷砂、锉刀压痕等物理磨损处理提高基体表面粗糙度的基础上,结合环氧树脂预浸润技术(RPC)对粘接基体进行表面处理.实验结果表明,结合了喷砂和锉刀压痕以及RPC处理的钢-尼龙粘接材料试样,单面搭接剪切法(SLS)测试剪切强度最大提升率达68.28％.     

聚丙烯材料表面化学接枝与粘接研究

作者用自由基引发剂(I)与丙烯酸(AA)、顺丁烯二酸酐(MAH)不饱和单体配制成接枝液,涂敷于聚丙烯(PP)板表面进行接枝反应,此后用E44环氧树脂作粘接剂粘接PP板材。考查了70～130℃温度范围内,单体/I比率、溶剂对表面接枝率和粘接强度的影响。     

聚丙烯塑料油墨用胶粘剂

太原市科技交流中心以聚丙烯、无规聚丙烯、氯苯等为原料，采用水相悬浮溶液氯化法工艺，制备出塑料油墨用粘合剂。该剂的氯含量均匀，粘接强度高，对非极性聚烯烃类材料粘接性能强，尤其适用于高速（50-150m/min）印刷作业，色泽鲜艳，印刷效果好。采用该粘合剂有着适用性强、残留溶剂量少，又适合层次印刷等优点，而使聚丙烯塑料薄膜不经表面处理就可达到理想的粘接强度。     

ZN-1阻尼材料表面处理方式对粘接性能影响

为了改善ZN-1材料与硬铝的粘接性能,在采用环氧胶黏剂情况下,通过不同方式对橡胶材料表面进行了处理。研究表明,采用打磨、清洗橡胶表面的方式对提高粘接强度并无帮助,而采用172℃热风、K2Cr2O7-H2SO4溶液处理ZN-1材料,则可以使其与硬铝粘接强度达到橡胶本体破坏的程度。红外光谱及电镜扫描揭示,两种方式提高粘接强度的原因在于橡胶材料表面粗糙度增大,而K2Cr2O7-H2SO4溶液处理还提高了材料表面的含氧官能团,因此可以获得2.0MPa以上的粘接强度。     

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。