SnO_2-Sb_2O_3-TiO_2导电粉末及其导电涂层的制备

以TiO2为基体,采用化学共沉淀技术制得复合导电粉末。利用正交试验得到优化的制备条件:复合反应体系组成为m(TiO2)∶m(SnCl4)∶m(SbCl3)=25∶15∶1,pH值为1.5,水解温度60℃,沉积SnCl4和SbCl3的水解产物于TiO2粒子表面,得到的包覆物在700℃下焙烧30 min,制备的复合导电粉末体的电阻率为77Ω.cm,粒径≤200 nm。将导电粉末与粘结树脂经球磨分散制得具有良好流动性的涂布液,在铝箔上能够制备得到电阻率低于108Ω.cm的导电涂层,满足制备有机光导体的要求,涂层表面平滑,无凹凸等缺陷。     

云母基复合导电粉末的制备

用化学共沉淀法制备一种以云母粉为基体,表面包覆一层掺杂SnO2-Sb2O3超细浅色导电粉末,利用正交实验方法,确定了云母基复合导电粉末制备的最优工艺条件:包覆率为100%、SnC l4.5H2O∶SbC l3=5∶1(摩尔比),加料时间为4.0 h、pH为2.5,煅烧温度为750℃。在上述条件下,可制得体积电阻率35Ω.cm、平均粒径为40μm的浅灰色的复合导电粉末,并举例说明复合导电粉末的应用。     

一种碳包覆锂离子电池复合正极材料的制备方法

本发明提供一种碳包覆锂离子电池复合正极材料的制备方法,通过按n(碳酸锂)∶n(氢氧化镍)∶n(氢氧化锰)∶n(氢氧化钴)=3/2∶1∶1∶1称取碳酸锂、氢氧化镍、氢氧化锰和氢氧化钴,再加入碳酸锂质量的6%的过量碳酸锂,将上述物料混合均匀后,加入蒸馏水球磨16 h;再置于50℃下烘干;在830～970℃下微波焙烧60 min后,得到灰黑色的LiNi1/3Mn1/3Co1/3O2粉末;然后加入LiNi1/3Mn1/3Co1/3O2粉末质量的1.5%～4%(质量     

ZnO∶Al包覆CaSiO_3∶(Pb,Mn)荧光粉(英文)

利用溶液中的共沉淀反应制备了CaSiO3∶(Pb,Mn)红色光致荧光粉。以Zn(NO3)2·6H2O和AlCl3·6H2O为原料,借助CO(NH2)2水解反应,用化学均相共沉淀法和热处理工艺在荧光粉表面包覆一层ZnO∶Al透明导电薄膜。对包覆前后的样品进行了X射线衍射结构分析、光致荧光分析、透射电镜形貌观察及电阻测量。结果显示:包覆后荧光粉的电导率显著提高,但光致荧光峰的位置和强度无明显变化。综合考虑包覆对荧光粉电阻率和荧光性质的影响,优化包覆条件和热处理条件为:n(Zn)/n(Ca)=10%,n(Al)/n(Zn)=5%,75℃水解1.5h;包覆后的样品在500℃热处理45min。     

云母基浅色导电粉末的制备工艺

用化学共沉淀法制备一种在云母表面包覆一层掺杂P的SnO2 Sb2O3 超细浅色导电粉末,对制备工艺过程进行了研究。探讨了影响导电粉末性能的几个主要工艺参数,并通过正交实验对制备工艺条件作了进一步研究,得到优化工艺条件:包覆率为 100%,m(SnCl4·5H2O)∶m(SbCl3 ) =5∶1,加料时间为 3. 5—4. 0h,pH=2. 5—3. 5。检测结果表明粉末体积电阻率小于 40Ω·cm,细度为微米级,颜色浅灰白。     

Al_2O_3@ZnO的制备及其对EP灌封胶导热性能的影响

以无机填料Al2O3作为EP(环氧树脂)灌封胶的导热填料,采用溶胶-凝胶法制备Al2O3@ZnO(Al2O3颗粒表面包覆ZnO),并着重探讨了导热填料含量、包覆浓度和烧结温度等对EP灌封胶热导率的影响。研究结果表明:采用单因素试验法优选出制备Al2O3@ZnO的最佳工艺条件是包覆浓度为n(ZnO)∶n(Al2O3)=1∶5、烧结温度为1 200℃;以此为导热填料,并且当φ(导热填料)=30%(相对于灌封胶体积而言)时,相应EP灌封胶的热导率[1.01 6 W/(m·K)]相对最大。     

喷墨导电墨水用超细纳米银粉的制备

以C_6H_8O_6(抗坏血酸)为还原剂、PVP(聚乙烯吡咯烷酮)为分散剂,采用液相还原AgNO_3(硝酸银)溶液法制备了喷墨导电墨水用超细纳米银粉。研究结果表明:当AgNO_3浓度为1.0 mol/L、n(C_6H_8O_6)∶n(C_6H_8O_6理论值)=1.5∶1、n(PVP)∶n(AgNO_3)=1.2∶1和反应温度为40℃时,可制得分散均匀、纯度较高的超细纳米银粉;该纳米银粉的平均粒径小于10 nm,可以满足喷墨印刷的工艺要求。     

原位沉析法制备壳聚糖磁性絮凝剂及其性能研究

以壳聚糖(CS)为基材,通过原位沉析法将其与磁性Fe3O4复合制备出CS/Fe3O4磁性絮凝剂。通过单因素实验,研究了n(CS)∶n(Fe3O4)、n(Fe2+)∶n(Fe3+)、反应温度、反应时间对CS/Fe3O4絮凝效果的影响。在制备条件为n(CS)∶n(Fe3O4)=8∶1、n(Fe2+)∶n(Fe3+)=3∶3、反应温度45℃、反应时间10 min时,所得CS/Fe3O4絮凝剂对高岭土悬浮液(245～255 NTU)的浊度去除率达到97%。     

技能大赛背景下硫酸亚铁铵制备工艺优化研究

为了提高全国职业院校技能大赛化学实验技术赛项硫酸亚铁铵产品的产率和纯度，通过L₉(3)⁴正交试验优选制备工艺。结果显示，制备工艺影响因素依次为铁粉与硫酸物质的量比(A)>反应温度(C)>铁粉与硫酸铵物质的量比(B),制备最佳工艺为A₃B₂C₃,即n(铁粉)∶n(硫酸)为1∶1.5,n(铁粉)∶n(硫酸铵)为1∶1.05,反应温度为85℃。该工艺合理，所制备硫酸亚铁铵的产率和纯度较高。     

浅色导电填料的研制

用共沉积法在微细蛭石基片上包覆一层SnCl4/SbCl3 的水解物 ,经煅烧可制得一种浅色的导电填料。详细研究了影响填料性能的工艺参数 ,得到了制备浅色导电填料的合适工艺条件。实验表明 ,控制水解温度为 4 0～ 5 0℃、pH值 3～ 4 ,n(SnCl4) /n(SbCl3 )为 8.7:1及一定的水解加料速度可制得电阻率在 10 4Ω·cm左右的导电填料 ,可用其生产具有抗静电功能的复合材料。     

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。