用微波脱硫法从废三元乙丙橡胶中制取再生胶的实验

文中综述了国外用微波脱硫法生产再生胶的概况，微波脱硫的机理，重点介绍了国内用微波脱硫法废三元乙丙橡胶制取再生胶的情况，微波脱硫的优越性及经济效益，强调说明用微波脱硫法生产再生胶具有极大的发展前景。     

微波脱硫法生产再生胶

本文综述了国外用微波脱硫法生产再生胶的概况及国内应用微波脱硫法作再生胶的实验情况,微波脱硫的机理,微波脱硫的优越性及经济效益,说明微波脱硫法生产再生胶具有极大的发展前途.     

微波脱硫法生产再生胶

我国目前生产再生胶的方法主要以动态脱硫法为主。该法生产时间长、能耗较大并存有污染问题。本文介绍微波脱硫生产再生胶工艺。 一、概述 微波脱硫法是一种非化学、非机械的一步再生法,它利用微波能量切断S—S键或S—C键而不切断C—C键,从而达到废橡胶再生目的。由于微波能断键是有选择性的,故用这种方法生产的再生胶性能     

再生胶的动态脱硫技术

介绍了再生胶传统的水同法和油法脱硫工艺,推出了动态脱硫新技术,使再生胶脱硫工艺更加完善。通过几各再生胶硫工艺比较,动态脱硫技术将逐步替代水油法和油法生产,成为国内生产再生胶的主要工艺。     

蚌埠橡胶厂再生胶生产新工艺装置投产

蚌埠橡胶厂再生胶生产新工艺装置投产１９９３年蚌埠橡胶厂投资１０５万元，仅用了两个月的时间，建成了年产６０００吨再生胶动态脱硫新工艺装置，已于年前生产出质量好的再生胶。动态脱硫新工艺生产再生胶其主要特点如下：①粉碎──水油法生产再生胶要求胶粉粒度一般在...     

超声波在废橡胶再生中的应用

再生胶的制造方法很多，如油法、水油法、快速搅拌脱硫法、连续挤出脱硫法及微波脱硫法等。但它们均存在一定的缺点。新近出现的超声波脱硫法具有高效、环保、产品质量高等优点，已受到广泛关注。     

我国首家年产3000t挤出法再生胶厂建成投产

我国首家年产３０００ｔ挤出法再生胶厂建成投产我国首家年产３０００ｔ挤出法再生胶厂于１９９４年５月在泰安建成投产。整个生产线是由沈阳化工学院设计的，一次试车成功，生产出了合格的再生胶产品。该法脱硫工序使用沈阳化工学院的专利脱硫挤出机。经生产实践验证，挤...     

废橡胶脱硫工艺的最新进展

本文综述了近几年废旧橡胶脱硫再生工艺的最新进展,其中有：密闭式捏炼机脱硫再生法,单螺杆或双螺杆连续脱硫再生法、双螺杆剪切脱硫再生法,常压中温橡胶塑化脱硫法,环保型废橡胶复原再生法,微波脱硫再生法等。这几种脱硫再生工艺都有共同的特点：节能,生产效率高,成本低,再生胶的物理性能高,生产过程无污染或污染较小。     

浅谈几种脱硫工艺的区别

我厂从1989年以来，主要生产合成橡胶再生胶，同时也生产天然橡胶再生胶。由于应用过多种脱硫工艺，因此对几种脱硫工艺的主要优缺点有一定的认识。脱硫是再生橡胶生产过程中的关键工艺。脱硫程度的好坏，直接影响到再生胶的质量。我国从50年代开始，一直是油法、水油法为主。1989年，我厂是行业内第一家应用导热油动态高温高压脱硫工艺。由于在使用过程中发现用导热油加热方式存在着许多不足的地方。1991年底，我厂自行研制了节能型直热式脱硫罐及工艺，获得了国家发明专利（专利号：ZL93ll2416．6）。直热式脱硫设备深受用户的欢迎，产品…     

再生胶新工艺生产装置建成投产

再生胶新工艺生产装置建成投产蚌埠橡胶厂借鉴国内动态脱硫新工艺研究成果，对年产６０００吨再生胶老生产线进行改造，建成了年产６０００吨再生胶新工艺生产装置，并于去年１１月生产出高质量的再生胶。采用动态脱硫新工艺生产再生胶的重要优点：（１）要求胶粉粒度达１...     

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。