对位芳纶的合成及纺丝工艺研究进展

介绍了合成对位芳纶的界面缩聚法、直接缩聚法、低温溶液缩聚法、酯交换法、气相合成法等主要方法。详细论述了已工业化的对位芳纶成纤方法如：一步法工艺、两步法工艺及其芳纶浆粕纤维的制备方法,指出生产对位芳纶采用低温溶液缩聚法的合成、原液纺丝法纺丝的工艺,是我国对位芳纶实现工业化的合适路线。     

对位芳纶国内外市场需求与产业化现状

简述国内外对位芳纶的生产能力、市场需求与应用领域,结合对位芳纶产业化经历,分析了对位芳纶聚合及纺丝工艺难点,探讨我国对位芳纶产业化存在的问题并提出建议;世界对位芳纶生产主要集中在杜邦公司和帝人公司,对位芳纶的消费已逐渐从军工、航天等领域发展到工业、民用领域,未来世界对位芳纶的需求将以较快速度增长;我国对位芳纶已实现千吨级产业化,主要应用于补强材料和防弹材料,但存在研发力量分散,连续生产不够稳定等问题,建议国家重点扶持,加强工程开发,促进我国对位芳纶的产业化进程。     

芳纶及其复合材料的制备技术及应用进展

介绍了对位芳香族聚酰胺纤维(简称对位芳纶)、间位芳香族聚酰胺纤维(简称间位芳纶)、带有杂环结构的三元共聚聚酰胺纤维(芳纶Ⅲ)的制备工艺及性能特点;概述了国内外芳纶的发展概况,我国对位芳纶、间位芳纶、芳纶Ⅲ及其复合材料的研究进展;阐述了芳纶在航空航天领域、军事和个体防护装备领域、建筑领域、电子电器材料领域、橡胶工业、环保领域的应用;指出今后我国对位芳纶的研究在其高聚物制备和纺丝技术上还需进一步提升;芳纶增强复合材料中,对于芳纶表面改性技术尚处于实验室阶段,实现大批量工业化生产,以及表面改性效果的持久性仍有待于进一步研究。     

高性能纤维4项目通过鉴定

正由仪征化纤、燕山石化、南化集团研究院会同中国纺织科学研究院共同承担的对位芳纶工业化热定型工艺开发、高性能聚乙烯短纤维加工及纺丝技术开发、干法纺丝用超高相对分子质量聚乙烯及纤维加工过程及质量指标研究和熔融纺丝用高相对分子质量聚乙烯专用料的研制项目,日前通过了中国石化科技部组织的鉴定。这4项技术都属于高性能纤维领域,研究成果均已得到工业化应用验证。鉴定专家认为,对位芳纶工业化热定型工艺开发项目研制和设计了满足工艺条件的高温热定型装置,     

国产化100 t/a的对位芳纶生产线顺利投产

<正>2019年11月23日,由内蒙古石墨烯材料研究院联合清华大学共同研发的国产化对位芳纶取得重大进展。经过3个多月的调试运行,100 t/a的对位芳纶生产线顺利投产,各项技术指标有望达到国际同类产品标准。100 t/a对位芳纶产线的投产,将为3 kt/a掺氮碳纳米管及石墨烯合成对位芳纶及纺丝工艺项目做准备,该项目分二期建设,一期100 t/a对位芳纶的示范线于2019     

对位芳纶的发展现状、技术分析及展望

介绍了美国杜邦公司、日本帝人公司、韩国、俄罗斯以及中国聚对苯二甲酰对苯二胺（PPTA）纤维（对位芳纶）的发展及其生产能力。从聚对苯二甲酰对苯二胺的合成、纺丝液的制备、干湿法纺丝、溶剂回收等方面探讨了制约中国对位芳纶发展的原因。详细介绍了对位芳纶主要产品的性能及英在,先进复合材料、防护材料、橡胶增强材料、建筑结构加固材料、摩擦材料和密封材料等领域的应用,并展望了中国对位芳纶的发展前景。     

烟台对位芳纶产业化项目

该项目位于山东省烟台市经济技术开发区。由烟台氨纶股份有限公司投资建设。项目主要建设内容是：利用自主开发的核心技术,推动对位芳纶低温聚合技术和干湿法纺丝技术在对位芳纶产业化领域的应用。建设对位芳纶生产线,形成年产1000吨对位芳纶的生产能力,实现对位芳纶产品的产业化。项目总投资2．5亿元,建设周期2010年-2011年。     

国内外芳纶的制备、产业现状及市场前景

简述了间位芳纶和对位芳纶聚合原料的制备、聚合方法和纺丝工艺,介绍并分析了国内外芳纶产业现状和市场前景。目前,国内外对芳纶的需求量还在不断上升,存在市场缺口;国内在芳纶产业化过程中还存在很多问题,和国外相比还存在一定的差距,不能满足国内实际生产需求。     

国产化100t/a的对位芳纶生产线顺利投产

<正>2019年11月23日,由内蒙古石墨烯材料研究院联合清华大学共同研发的国产化对位芳纶取得重大进展。从投料到收丝,经过3个多月的调试运行,年产100 t的对位芳纶生产线顺利投产,各项技术指标有望达到国际同类产品标准。年产100 t对位芳纶生产线的投产,将为年产3 000 t掺氮碳纳米管及石墨烯合成对位芳纶及纺丝工艺项目做准备。该项目位于内蒙古包头装备制造产业园区内,总占地面积150亩,总建筑面积52 600 m~2。     

一种用于对位芳纶高速纺丝的凝固浴加速装置

正本发明公开了属于化纤纺丝领域的一种用于对位芳纶高速纺丝的凝固浴加速装置以及与之配套的高速纺丝工艺,该装置由可调节高度的漏斗结构、水槽和环形喷射系统3部分组成,本发明通过新的高效凝固浴加速装置的设计,以及与之     

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.     

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.