高相比耐漏电起痕指数值、高GWIT、无卤阻燃连续长连续长玻纤增强PET的研究及应用

采用自行复配的无卤阻燃剂制备了无卤阻燃连续长玻纤增强PET材料。该材料具有较好的阻燃性能、较高机械性能及良好电绝缘性能,其相比漏电起痕指数已超过600V。而且,该材料还具有对银和铜等电极具有低腐蚀性。该材料已经广泛应用于接触器、漏电保护器、断路器外壳等电子电器领域的产品。     

高CTI高GWIT无卤阻燃连续长玻纤增强PC的研究及应用

采用自行复配的无卤阻燃剂制备了无卤阻燃连续长玻纤增强聚碳酸酯(PC)材料。该材料具有较好的阻燃性能、较高机械性能及良好电绝缘性能,其相比耐漏电起痕指数(CTI)已超过600V。而且,该材料对银和铜等电极具有低腐蚀性。该材料已经广泛应用于接触器、漏电保护器、断路器外壳等电子电器领域的产品。     

海外资讯

工程塑料无卤阻燃剂以色列助剂生产厂Algem ia公司最近在欧洲成立分公司,扩大业务,并推出一些无卤阻燃剂牌号和阻燃母料,开发应用的目标为尼龙6、尼龙66、PBT和聚碳酸酯(PC)。阻燃剂母料M-0320,应用于包括玻纤增强或本色、无增强尼龙的牌号。M-0320不会影响和降低尼龙的机械性能和CTI(耐漏电起痕指数)值,应用领域为电子电器工业。M-0426是PBT聚酯用母料,在玻纤增强PBT中含量达26%时,PBT阻燃性达U L94V-0级,玻纤增强PBT仍保持良好的机械性能。K0160和K0291是专用于阻燃PC配混料的牌号。[唐伟家译自“European PlasticsNews”,2…     

无卤阻燃增强PBT的无磷化氢化研究

对比研究了红磷、次磷酸盐、烷基次磷酸盐三种无卤阻燃剂在玻纤增强聚对苯二甲酸丁二醇酯(PBT)中的各项力学性能、阻燃性能及磷化氢(PH_3)释放量,并研究了通过匹配不同电势的金属化合物缚酸剂及螺杆组合对PH_3释放量的影响。结果表明,使用烷基次磷酸盐复配阻燃体系,无卤阻燃增强PBT材料可以达到UL94 V-0(1.5mm),同时无PH_3释放,综合力学性能优异,从而用于具有磷化氢限制要求的终端电子电器接插件行业。     

固体酸协同MPP对GF增强PA6的阻燃性研究

采用热聚合法制备聚磷酸三聚氰胺（MPP）无卤阻燃剂，与固体酸协同阻燃玻纤增强尼龙6材料，实现了玻纤增强尼龙6的无卤阻燃。研究发现：固体酸的引入可增强体系凝聚相阻燃作用，促进材料在燃烧时形成更为连续、致密的炭层。添加质量分数30．00％MPP，质量分数3．00％固体酸可使质量分数30．00％玻纤增强PA6材料达UL94-1．6mm V-0阻燃级别，材料的拉伸强度、断裂伸长率、弯曲强度、冲击强度分别可达84．3MPa，3．8％，128MPa，3．4kJ／m^2，具有良好的综合性能。     

无卤阻燃增强增韧PBT研制

为改善聚对苯二甲酸丁二酯(PBT)材料易燃、韧性差等缺点,研制出无卤阻燃增强增韧PBT材料。对比了传统含卤阻燃剂与新型无卤阻燃剂对PBT阻燃性能的影响,并利用氮–磷系无卤阻燃剂HT–202A、玻璃纤维、增韧剂SWR–6B对PBT进行改性,研究了阻燃剂、玻璃纤维、增韧剂对PBT阻燃性能以及力学性能的影响。结果表明,无卤阻燃剂在与含卤阻燃剂含量相当的情况下,可以使PBT阻燃性能达到V–0级;在玻璃纤维含量为30%,阻燃剂HT–202A含量为16%,增韧剂SWR–6B添加量为5%时,PBT材料的阻燃性能达到V–0级,拉伸强度达到101 MPa,弯曲强度达到145 MPa,缺口冲击强度达到9.5 kJ/m~2,综合性能优异。     

高循环利用的无卤阻燃聚对苯二甲酸丁二醇酯(PBT)研制

综合对比自行研制的无卤阻燃PBT与传统卤系阻燃PBT的力学性能、阻燃性能、电性能.研究无卤阻燃PBT材料在多次循环回收利用情况下的性能变化.结果表明:在满足相同的阻燃要求时,无卤阻燃PBT和卤系阻燃.PBT的综合力学性能相当;无卤阻燃PBT的电性能明显优于卤系阻燃PBT;无卤阻燃PBT可在大比例回填下综合性能基本保持不变.     

增强阻燃PBT的性能研究

采用硅烷偶联剂对玻纤进行处理性,探讨了螺杆转速和螺杆组合对阻燃增强聚对苯二甲酸丁二醇酯(PBT)力学性能的影响;并研究了不同玻纤、PBT、阻燃剂对增强阻燃PBT抗水解性能的影响。结果表明:处理玻纤提高了玻纤和基体界面的相互作用,复合材料的拉伸、弯曲和缺口冲击强度分别提高了10.6%、13%和19.6%;主机螺杆转速过高或螺杆组合的剪切过强都会使玻纤长度低于0.4 mm而降低增强作用,导致材料的力学性能下降。水煮后增强阻燃PBT力学性能的下降幅度主要取决于玻纤和树脂之间的界面,玻纤ECR5303A-2200增强阻燃的PBT的拉伸、弯曲和缺口冲击强度的保持率分别为水煮前的96%、88%和75%;其次为阻燃剂,树脂基体影响最小。加入自制增韧剂可显著降低增强阻燃PBT的端羧基浓度,从而有效提高其抗水解性。     

高机械性能无卤阻燃PBT复合材料的制备

采用高效无卤阻燃剂CJ-1002、玻璃纤维、马来酸酐接枝乙烯辛烯共聚弹性体(POE-g-MAH)对聚对苯二甲酸丁二醇酯(PBT)进行阻燃及力学改性,研究了加工工艺对复合材料性能的影响。实验表明,PBT、阻燃剂、玻纤、POE-g-MAH的质量比为48/18/30/4时,复合材料在阻燃级别达到V-0的同时,拉伸强度、弯曲强度以及缺口冲击强度较改性前都有比较大的提升。     

高CTI值、无卤阻燃玻纤增强尼龙66的研究及应用

采用红磷母粒及适当的添加剂制备了无卤阻燃玻纤增强尼龙66材料。结果表明,该材料具有较好的阻燃性能、力学性能及电绝缘性能,其相比漏电起痕指数已达到600。此外,该材料还具有对白银、紫铜及黄铜等电极的低腐蚀性。该材料已接近或达到德国BASF公司A3X3G5材料的性能。用该材料制备的接触器、断路器外壳具有良好的阻燃性能及电绝缘性能,产品质量已得到了客户的认可。     

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。