耐蒸煮食品包装袋用聚氨酯油墨的技术进展

从单组分挥发型聚氨酯油墨、改性聚氯酯油墨和双组分反应型聚氨酯油墨三方面,阐述了耐蒸煮食品包装袋用聚氨酯油墨的技术进展。     

耐蒸煮复合薄膜用聚氨酯粘合剂通过鉴定

安徽大学高分子材料研究所研制成功的耐蒸煮复合薄膜用聚氨酯粘合剂,已于1998年12月通过了由安徽省教委主持的省级技术鉴定.     

印刷油墨粘合剂用的松香载体尿素-聚氨酯-改性聚合物

松香载体乳化聚合物组分,是用含单体的尿素和／或含单体的聚氨酯改性,与丙烯酸或苯乙烯单体反应,生成乳化聚合物胶乳。这种乳化聚合物胶乳可用来配制印刷油墨,在胶粘剂和挤压层压印刷的使用中耐超级剥皮。ＡｒｍｅｅｎＣ尿素添加剂加ＴＭ１,与苯乙烯和丁基丙烯酸酯乳化聚合,得到一种胶乳,用异丙醇１３份、颜料蓝３５份和水粘合,作为印刷粘合油墨使用。印刷油墨粘合剂用的松香载体尿素-聚氨酯-改性聚合物@刘玉春     

水性聚氨酯的应用

结合本公司十年来科研攻关开发的各种水性聚氨酯产品及客户实际应用获得的经验,探讨了水性聚氨酯在木器涂料、上光油和油墨以及粘合剂中的应用,列举了不同用途的水性聚氨酯涂料、油墨及粘合剂的参考配方及其制备方法。     

耐蒸煮食品包装袋用聚氨酯油墨的技术进展

随着杀菌技术的迅速普及和塑料薄膜被广泛应用,蒸煮食品得到较快发展。因此提高蒸煮食品复合包装水平日益重要,其中所用印刷油墨的质量是衡量蒸煮食品复合包装水平的一项关键因素。本文从单组分挥发型聚氨酯油墨、改性聚氨酯油墨和双组分反应型聚氨酯油墨3个方面阐述了国外蒸煮食品包装袋用聚氨酯油墨的技术进展。     

专利介绍

自催化交联型有机硅／环氧复合密封胶;耐湿热环氧胶粘剂;光学部件用粘合剂;改性环氧树脂胶粘剂及其制备方法;建筑防水层自粘胶;皮革全转膜用热烫印背胶及其制备方法.     

水性聚氨酯油墨连接料的关键性能分析

综述了食品包装用水性聚氨酯(WPU)油墨连接料的耐蒸煮性(热稳定性、耐水性和附着性能)、干燥速率和复溶性等关键性能的特点及改善方法,提出了采用对称结构的二异氰酸酯、小分子扩链剂及结构规整的耐水解性较好的聚酯多元醇为主要原料,制备的高固含量WPU可获得较好的耐蒸煮性和干燥速率;在此基础上,制备亲水性低聚物包围疏水性聚合物的复合乳液(或掺杂过度金属螯合物),可平衡WPU油墨的复溶性和耐水性,从而满足WPU油墨的印刷适性。最后对WPU油墨今后的发展方向进行了展望。     

下游动态

<正>万华北京推出耐辛辣及化学介质高温蒸煮粘合剂目前,万华化学(北京)有限公司凭借多年的技术积累,终于突破技术壁垒,打破国外垄断,成功研发出耐高温蒸煮型复合粘合剂,且其完全可以用来包装含辛辣、溶剂等内容物的高性能粘合剂。WANANTE6060A/WANEXEL761B双组份聚氨酯溶剂型耐辛辣蒸煮复合粘合剂,其用于复合蒸煮袋,蒸煮后剥离强度可达到4N/15mm;当内容物为辛辣介质,经121℃*30min蒸煮后,将样品袋放置于60℃烘     

聚氨酯预聚物中游离甲苯二异氰酸酯的高效凝胶渗透色谱测定

<正> 一引言聚氨酯具有许多优良的化学性能,它具有橡胶的高弹性,又具有塑料的高强度,还有优异的耐油、耐冲击、耐低温、耐辐射、隔热、绝缘等性能,另外还有特别突出的生物相容性与血液相溶性。因此广泛地用於泡沫塑料、绝缘、涂料、油墨、清漆、医药、粘合剂等工业。异氰酸单体具有毒性,故要求聚氨酯预聚物中游离的单体含量有一限制。国内外已有若干种测定其游离异氰酸酯     

水性乳液—聚氨酯系粘合剂

水性乳液——聚氨酯系粘合剂为单组份反应型热固性体系,是木材工业用理想粘合剂,特别适用于复合层压板制造、木质装饰膜的复合和颗粒板压制。本文介绍了聚乙烯醇水溶液——聚氨酯系粘合剂和聚乙烯醇水性乳液——聚氨酯系粘合剂的组成、配方举例、贮存稳定性及应用效果     

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.     

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.     

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。     

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.     

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.