常温除油剂

常温除油剂解长利（贵州六盘水煤矿厂，５５３４０２）常温发黑工艺已广泛应用于生产实践中，我们对其整套工艺均采用常温处理，即常温除油→除锈→常温发黑→浸常温脱水防锈油。这样在生产中就解决了电力不足的问题，同时也节约了大量能源。常温除油剂具有低泡、防锈的特...     

长沙沃尔金属表面技术有限公司

<正>为您提供金属表面防腐产品及其技术黑色磷化剂:本产品为单组份、工艺操作简单、适用范围广、成本低、处理铸钢、铸铁、合金钢、高硅钢均能在表面形成色泽均匀的黑色膜,特别是经过热处理(如渗碳、碳氮共渗)的工作不须要酸洗,保证工作尺寸精度和硬度要求,膜层防腐性好,具有耐磨性、减摩性、防锈性。钢铁常温发黑剂:操作安全、方便,生产批量灵活,随时满足生产要求,工作效率高。脱水防锈油:在常温下能快速排出残留在工件表面、盲孔及金属疏松毛孔的水膜及手汗痕迹,具有脱水和长期防锈功能,防锈时间可达两年。     

防锈油在机械零件上的应用试验

本文介绍了HH932脱水防锈油的防锈性能、工艺性和经济价值，举出了在工厂中工序间及封存防锈和对已锈零件的去锈、防锈处理的应用实例。     

DK-7号硬膜抗滑防锈油

针对离合器刹车用油基防锈油防锈但不阻滑、水基防锈油阻滑但不防锈的情况,研制出DK-7号硬膜抗滑防锈油。由乙醇、120号溶剂汽油、改性树脂、醇溶性树脂、络合剂、阻滑剂等经聚合反应等工序制得。该防锈油既有防锈性,又有抗滑性和渗透性,是油基防锈油和水基防锈油的替代品。     

恒丰RP-900G静电喷涂钢板防锈油的研制

防锈性是防锈油的基本性能之一,磺酸盐是防锈剂中代表性的品种。目前,国内现用钢板防锈油中大多使用含钡金属皂盐的防锈剂,由于钡金属盐具有一定的毒性,该种防锈剂在钢板后道脱脂时直接溶于脱脂液中,造成一定的环境污染。我们通过研发低碱值的、不含重金属的防锈剂来生产环保型的静电喷涂防锈油,减少了油品在使用过程中给环境带来的污染,具有较为广阔的市场前景。     

聚α-烯烃基础油黏度对防锈油防锈性能的影响

考察了基础油的黏度对防锈油防锈性能的影响。选取4种不同黏度的PAO(聚α-烯烃)基础油分别添加不同量的防锈添加剂TW742,溶解调制成防锈油,通过湿热试验和盐水浸渍试验测试其防锈性能。试验结果表明,同等条件下(防锈添加剂TW742量大于5%),作为载体的基础油黏度越小,所配制的防锈油效果越好。选取的4种PAO基础油中,黏度最小的PAO2C与防锈添加剂TW742所配制的防锈油效果最好。初步探讨了基础油黏度影响防锈油防锈性能的机理。     

防锈添加剂743钡皂技术鉴定会在杭召开

军用防锈油添加剂743钡皂为石油部下达的科研项目,经大连石油七厂、杭州市化工研究所与临安横畈化工厂的共同努力,完成了科研和试生产任务,于85年3月11日在杭州通过省级技术鉴定。 743钡皂为一种深褐色膏状固体,加热熔化成油状液体,不溶于水的优良油溶性防锈剂。它具有优良的抗潮湿、抗盐雾性能,加入润滑油、润滑脂、石油磺酸盐中均有较好的防锈效果,对钢、铸铁及铜等有色金属有良好的防锈性能。国外、该产品已广泛应     

工序间防锈油

机械加工过程使用水溶性乳化液作冷却剂,加工后的零部件易生锈。茂名石油工业公司研究院研制成功的RA—1工序间防锈油,具有良好的人汗置换和水置换防锈性能,适用于潮湿地区工序间防锈和水洗后工件的短期脱水防锈。油品闪点高、安定性好,油膜薄而均匀,易于清洗。用户试用效果良好,已通过省石化厅鉴定,并投入批量生产。     

典型防锈剂在不同基础油中的防锈性能研究

以45钢为对象,应用湿热试验和盐水浸渍试验研究了磺酸盐类防锈剂TW742、羧酸盐类防锈剂环烷酸锌和酯类防锈剂司本-80在不同运动黏度的合成油(聚α-烯烃基础油)和环烷基矿物油中的防锈性能。结果表明:在湿热试验中,3种防锈剂制备的防锈油均能在金属表面形成较好的吸附膜,对金属有较好的保护作用;在盐水浸渍试验中,以防锈剂TW742制备的防锈油防锈效果较好,而环烷酸锌和司本-80制备的防锈油防锈效果较差。对3种防锈剂的防锈机理进行了解释。     

几种热镀锌产品用防锈油的性能对比和选择

通过挥发性试验、中性盐雾试验、摩擦因数测试和脱脂性能测试对比了4种热镀锌产品用防锈油(成分相同,但防锈剂和酯类辅助添加剂用量不同)的挥发性、润滑性、耐蚀性和可清洗性。结果表明,各种防锈油在自然环境下都会快速挥发,在储存时应做好防护,避免防锈油挥发而导致防锈、润滑等作用消失。4种防锈油各有优势,可根据实际应用场合来选用。     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009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、环氧树脂、不饱和聚酯树脂)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。     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。     

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.