无溶剂环氧防腐涂料的制备和性能研究

开发了一种以腰果酚改性胺为固化剂的无溶剂环氧防腐涂料,介绍了环氧树脂、固化剂、稀释剂以及填料等原料的选择,探讨了环氧树脂与腰果酚改性胺的固化机理,并考察了硅烷偶联剂对涂层防腐性能的影响。检测结果表明,环氧树脂与腰果酚改性胺的固化主要以环氧基与胺基之间的反应为主;硅烷偶联剂可以提高涂层的附着力,有效地增强涂膜的耐水性。     

腰果酚曼尼希改性胺-环氧树脂热固化性能的研究

为了得到一种具有内增韧的同时也能具有良好的耐热性的固化剂,制备了腰果酚酚醛胺、腰果酚-苯酚混酚酚醛胺、苯酚酚醛胺3种固化剂。主要研究了固化剂与环氧树脂加热固化物的固化度、粘接性能和综合力学性能(压缩性能、冲击性能、拉伸性能等)。结果表明,制备的腰果酚-苯酚混酚酚醛胺固化剂保留了腰果酚醛胺固化剂优良的冲击韧性、较长的适用期等优点,同时也保留了苯酚酚醛胺固化剂较高的力学性能和胶接性能,是一种综合性能较佳的环氧固化剂。     

环氧树脂腰果酚醛胺及腰果酚醛酰胺固化剂的合成及其性能研究

采用曼尼希反应合成了一类新的环氧树脂室温固化剂——腰果酚醛酰胺。重点研究了固化剂的合成机理及其胺值的控制方法。采用傅里叶红外光谱(FT-IR)表征了固化剂的结构。采用差示扫描量热仪(DSC)比较了腰果酚醛胺、腰果酚醛酰胺以及聚酰胺的固化动力学,并揭示了腰果酚醛酰胺的固化机理。分别以合成的腰果酚醛胺和腰果酚醛酰胺固化无溶剂环氧树脂涂料,测定涂层的机械力学性能、热力学性能以及防腐蚀性能,结果表明:相比聚酰胺和腰果酚醛胺固化剂,用腰果酚醛酰胺固化的涂膜具有优异的低温固化性、柔韧性、硬度以及防腐性能。     

固化剂对有机改性凹凸棒石/聚苯胺环氧树脂复合涂层性能的影响

固化剂对涂层的防腐、力学性能起着至关重要的作用.以环氧树脂为成膜物质,采用原位复合法在环氧树脂体系中合成有机改性凹凸棒石/聚苯胺(OAT/PAn)复合涂层,分别使用改性脂肪胺固化剂593、酚醛胺固化剂T-31以及聚酰胺固化剂650对上述涂层进行固化,讨论了不同种类固化剂对涂层的化学结构、防腐和力学性能以及耐水性能的影响.利用FTIR 对比了各涂层的固化结构,证明了三种固化剂均可使复合涂层固化;SEM结果表明,593固化剂固化涂层的致密性最好;电化学实验结果表明,593固化剂的固化涂层防腐性能最佳,腐蚀电位达到了Ecorr=-318 mV,腐蚀电流密度Icorr=1.193×10-6 A·cm-2;通过划格法评价了各涂层的附着力,发现593固化剂固化效果最好,附着力可达5B;对比浸泡168 h后涂层的耐水性发现,593固化剂耐水性最好.     

腰果酚改性胺-环氧树脂室温固化性能的研究

为了实现固化剂的内增韧,采用腰果酚、苯酚、甲醛和三乙烯四胺为原料,利用傅克烷基化反应和曼尼希反应制备了腰果酚-苯酚混酚改性胺固化剂。主要研究了固化剂与环氧树脂的室温固化工艺性能,室温固化物的固化度、粘接性能和综合力学性能(压缩性能、冲击性能、拉伸性能、硬度等)。结果表明,制备的腰果酚-苯酚混酚酚醛胺固化剂具有优良的冲击韧性、较长的适用期、室温快速固化能力、较高的力学性能和胶接性能优点,是一种综合性能较佳的环氧固化剂,有很好的应用前景。     

聚酰胺与腰果酚改性胺环氧固化剂的耐黄变性能比较

E-20环氧树脂分别与聚酰胺树脂和腰果酚改性酚醛胺固化,将漆膜曝晒,检测色差;用紫外线照射,检测漆膜性能。发现腰果酚改性酚醛胺比聚酰胺使环氧漆膜变黄的速率要快,紫外线对前者颜色影响更大,因而聚酰胺适合于作环氧面漆固化剂,腰果酚改性酚醛胺适合于作环氧底漆固化剂。     

酚醛环氧防腐涂料用固化体系研究进展

综述了近年来国内外酚醛环氧防腐涂料用固化体系的研究现状和进展,包括苯酚-甲醛、双酚A-甲醛树脂和腰果酚-苯酚-甲醛树脂等酚醛树脂固化体系,苯酚-甲醛、双酚A-甲醛改性胺和腰果酚缩醛胺固化体系及其他固化体系。认为腰果酚改性胺固化剂是一种性能优异的环氧树脂固化剂,它对开发新型高性能、多用途、低成本和环保型的重防腐环氧树脂涂料固化技术提供了新思路。     

聚酰胺及腰果酚改性胺环氧固化剂的研究进展

综述了聚酰胺及腰果酚改性胺环氧固化剂的制备、固化过程及性能研究进展,介绍了2种新型固化剂腰果酚改性聚酰胺和腰果酚酰胺。     

双组分喷涂型无溶剂超厚膜环氧重防腐涂料的研制

选用高环氧值、低黏度改性环氧树脂作为基料树脂,按一定比例复配曼尼斯碱和腰果酚酚醛胺为固化剂,搭配自制触变性浆体、多活性端基低黏度聚合物活性稀释剂、缓蚀型颜填料及助剂,制备了一种双组分喷涂型无溶剂超厚膜环氧重防腐涂料,并对涂料性能影响因素进行了分析,对涂层性能进行了测试,结果显示该涂料机械性能和防腐性能优异。     

石墨烯改性抗H2S酸性介质高效防腐涂层技术的研究与应用

为解决石油石化装置在有H2S、CO2等酸性介质存在条件下的腐蚀问题,通过对酚醛环氧树脂和酚醛胺固化剂配套成膜物体系、耐酸性颜填料体系等的研究,形成了耐酸性良好的涂料,同时通过在涂料中添加石墨烯分散体,改善了涂层的耐盐雾性、附着力和耐化学品性.实验室研究及现场应用均表明该石墨烯改性耐酸涂料具有优异的综合物理化学性能,其涂层的耐盐雾、耐化学品、抗H2S腐蚀、耐碱等性能优异,满足了存在H2S、CO2的酸性油气田恶劣腐蚀环境下的防腐要求.     

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.     

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.     

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。     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.