共查询到20条相似文献,搜索用时 62 毫秒
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《化工中间体》2002,(6):43-43
活性染料以色泽鲜艳、色谱齐全、应用简便、价格较廉、适应性强、牢度优良而称。现已发展成为棉用染料中最重要的染料类别,成为世界重点发展和关注的一类染料。如果说活性染料的问世是染料分子与纤维分子结合方式的革命,那么活性染料的绿色化则是活性染料发展的必然趋势。由于活性染料具有色泽鲜艳、使用范围广、性能优异等诸多优点。使得活性染料在问世近半个世纪中得到了长足的发展,从1996年到1998年,世界活性染料的生产量由9万t上升到14万t,占世界染料总产量的15%,占棉用染料消耗总量的36%。2000年我国活性染料的产量已逾3.5万t,约占我国染料总产量的7.0%。国内外染料工作在活性染料的研究和生产中付出了艰辛的努力,使活性染料近几年的发展非常迅速,成为天然纤维和部分合成纤维中最主要的一类染料。 相似文献
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世界染料与染整工艺科技创新 总被引:4,自引:6,他引:4
根据染料母体的生物相容性论述了非诱变性染料和仿生染料在纺织纤维着色中的发展方向;论述了实现高固色率活性染料的有效途径以及通过交联染色方法实现染料与纤维近100%化学结合的可行性;介绍了环境友好染色新工艺,活性染料无盐染色,还原染料和硫化染料生化法还原或电还原法染色,非水溶剂染色以及喷墨印染技术。 相似文献
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活性染料用于拉细羊毛染色的研究 总被引:2,自引:0,他引:2
研究了四类活性染料染拉细羊毛的工艺条件和十二个染色配方。与媒介染料相比,用活性染料对拉细羊毛染色可获得更好的效果。染料的溶解度、匀染性、上色率、固色率均好于媒介染料,颜色的批差小。研究结果表明:除煮呢沾色牢度外,染色羊毛的各项牢度均优于媒介染料。 相似文献
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一、活性染料直接印花活性染料是一种具有化学反应性的染料,它能与羟基、胺基(伯胺基)发生化学键合,因而能对棉、羊毛、丝等多种纤维进行染色和印花。按染料中所含活性基团的不同,常用者可分为四大类:(1)二氯三嗪活性染料(国产X型染料);(2)一氯均三嗪活性染料(国产K型染料) 相似文献
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综述了反应注射、反应挤出和反应性共混三种反应性加工方法,介绍了它们在合成新型高分子制品、聚合物改性以及废旧橡胶、塑料回收利用等方面的应用。 相似文献
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Fan Zhang Akio Yoshinaka Robert C. Ripley 《Propellants, Explosives, Pyrotechnics》2024,49(3):e202300260
A structural reactive material (SRM) cylinder is considered here as a limiting case of a dense metallic energetic system in which a mixture of metal particles is consolidated to the theoretical maximum density excluding porosity, to possess both high energy density and mechanical strength. Dynamic fragmentation and free-field explosion of a 103 mm inner diameter SRM cylinder charge is experimentally studied, with a wall thickness varying in a range of metal-to-explosive mass ratio M/C=1.3 to 4.0. Under explosive loading, the SRM cylinder produces a designated fragment size distribution divided into two groups: fine fragments with sizes on the order of 102 μm and below, and coarse fragments with sizes on the order ranging between 100-101 mm. Prompt detonation shock-induced reaction (DSIR) of the expanding cloud of high-concentration fine fragments supplements the energy to enhance the primary blast as it propagates, while the coarse fragments form a high-speed, high-concentration metal momentum flux crossing the fireball and blast front to contribute to the total impulse loading to a nearby structure. Rapid impact-induced reaction (IIR) of the secondary fragments from high-speed coarse SRM fragments further enhances the reflected blast loading or generates a high interior explosion pressure as fragments perforate into the structure. The above distinctive characteristics of a unique hetero-blast are coupled effectively in the near-field range. 相似文献
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高分子合金反应性共混体系研究近况 总被引:1,自引:0,他引:1
综述了反应性增容技术研制高分子合金的最新进展 ,分别讨论了各种反应性增容技术 ,着重阐述了带有活性官能团的反应性聚合物的增容作用 ,包括含酸酐官能团的反应性共混、含羧酸官能团的反应性共混、含羧酸衍生物官能团的反应性共混及含有环氧基团或羧基的反应性共混等 相似文献
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综述了近期国内外通过将能发生化学反应的聚合物进行熔融共混、加入能与共混组分起反应的聚合物、添加能与共混组分在熔融共混过程中形成共聚物或产生交联的低分子化合物 3种方法进行聚烯烃共混体系反应性增容研究的进展 相似文献
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We have shown that autoxidized polyphenolic nutraceuticals oxidize H2S to polysulfides and thiosulfate and this may convey their cytoprotective effects. Polyphenol reactivity is largely attributed to the B ring, which is usually a form of hydroxyquinone (HQ). Here, we examine the effects of HQs on sulfur metabolism using H2S- and polysulfide-specific fluorophores (AzMC and SSP4, respectively) and thiosulfate sensitive silver nanoparticles (AgNP). In buffer, 1,4-dihydroxybenzene (1,4-DB), 1,4-benzoquinone (1,4-BQ), pyrogallol (PG) and gallic acid (GA) oxidized H2S to polysulfides and thiosulfate, whereas 1,2-DB, 1,3-DB, 1,2-dihydroxy,3,4-benzoquinone and shikimic acid did not. In addition, 1,4-DB, 1,4-BQ, PG and GA also increased polysulfide production in HEK293 cells. In buffer, H2S oxidation by 1,4-DB was oxygen-dependent, partially inhibited by tempol and trolox, and absorbance spectra were consistent with redox cycling between HQ autoxidation and H2S-mediated reduction. Neither 1,2-DB, 1,3-DB, 1,4-DB nor 1,4-BQ reduced polysulfides to H2S in either 21% or 0% oxygen. Epinephrine and norepinephrine also oxidized H2S to polysulfides and thiosulfate; dopamine and tyrosine were ineffective. Polyphenones were also examined, but only 2,5-dihydroxy- and 2,3,4-trihydroxybenzophenones oxidized H2S. These results show that H2S is readily oxidized by specific hydroxyquinones and quinones, most likely through the formation of a semiquinone radical intermediate derived from either reaction of oxygen with the reduced quinones, or from direct reaction between H2S and quinones. We propose that polysulfide production by these reactions contributes to the health-promoting benefits of polyphenolic nutraceuticals. 相似文献
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