高阻隔涂料的生产现状及发展前景

阐述了高阻隔涂料的特征和国内外市场现状,以美国纳幕尔杜邦公司的丙烯酸酯类涂料为重点,介绍了高阻隔涂料的生产工艺,分析其经济效益并预测了发展前景.     

食品软包装用透明高阻隔涂料：PVA涂料研究进展

聚乙烯醇（PVA）因其良好的透明性和成膜性以及优异的氧气和有机溶剂阻隔性，可用于透明、易回收、环境友好型的食品高阻隔软包装材料。但因其涂层对湿度敏感性差且不具备水蒸气阻隔性能而制约其发展。针对这一问题，目前主要有两种解决方法：一种是PVA化学交联，PVA能进行多元醇的酯化、醚化、缩醛化等化学反应；另一种是制备PVA-纳米复合涂料，PVA与纳米层状材料如蒙脱土（MMT）以及氧化石墨烯（GO）复合涂料的研究已取得较大进展。为此，分别从PVA的阻隔性及其影响因素、化学交联PVA涂料以及PVA-纳米复合涂料的最新研究进展进行了综述，分析了改性PVA涂料面临的问题，展望其未来研究方向。     

索尔维携系列特种聚合物技术亮相2014中国国际涂料展

<正>在第十九届中国国际涂料展上,索尔维特种聚合物事业部隆重推出创新型解决方案,以应对整个大中华区涂料市场发展面临的关键性挑战。索尔维能够提供广泛的创新型特种聚合物产品技术组合,如Diofan誖HBP系列高阻隔性水基(PVDC)聚合物,可专门满足海洋及     

高效环保高速9层共挤高阻隔膜生产线

本文对高阻隔薄膜的性能、用途和结构进行说明，分析高阻隔薄膜的工艺控制要点以及介绍了最新研究成果九层共挤高阻隔流延薄膜设备。     

来自欧美的全新概念包装—高阻隔氟化瓶

与普通塑料瓶相比高阻隔氟化瓶内表面所特有高阻隔氟化层，对大多数渗透性溶剂有良好的阻隔作用，并具有良好的遮光性、气密性和质量轻的特点。     

行业动态

<正>辽宁开原瑞信公司多层共挤高阻隔包装材料通过鉴定辽宁省开原市瑞信印务有限公司研制成功的一种采用纳米技术制成的改性高阻隔聚合物——多层共挤高阻隔包装材料,日前通过了由辽宁省科技厅、省经济委员会组织的省级科技成果鉴定。参与鉴定的专家认为:开原瑞信公司多层共挤高阻隔包装材料技术的研制成功打破了发达国家对多层共挤高阻隔包装材料的垄断,提升了我国包装行业的技术水平和市场竞争力。     

高阻隔材料的研究进展及其在军品包装中的应用

介绍了当前市场常见的高阻隔性高分子材料:乙烯乙烯醇共聚物(EVOH)、聚偏二氯乙烯(PVDC)、聚酰胺(PA)、聚对苯二甲酸乙二醇酯(PET)、聚萘二甲酸乙二醇酯(PEN)、聚乙烯醇(PVA)。详细分析了高分子结构与阻隔性能的关系,介绍了高阻隔性高分子材料的研究现状,阐述了各类高阻隔性高分子材料在军品包装中的应用,展望了高阻隔包装材料的发展趋势。     

PVDC将成为软包装主流高阻隔材料

本文介绍了高阻隔材料PVDC的发展史，特性、环保性、应用及发展前景。     

高阻隔液态牛奶包装膜

介绍新型的高阻隔材料——丙烯酸酯共聚物。将其配制成高阻隔涂布液,再用涂布设备将高阻隔涂布液涂布于三层共挤聚乙烯底膜上,干燥后在高阻隔层上复合一层聚乙烯薄膜,得到高阻隔高保香性的液态牛奶包装膜。该产品在阻隔效果、投资成本、包装成本和卫生环保等诸多方面,都要比市场上的其他阻隔材料优秀很多。     

最新专利

【发明名称】用于真空绝热板的高阻隔复合膜及其制造方法【申请号】201210013289【摘要】1种用于真空绝热板的高阻隔复合膜及其制造方法,其特征是:在高阻隔薄膜的最外侧用流延的方式     

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.     

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.     

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.     

Novel polyurethane coating technology through glycidyl carbamate chemistry

Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.