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热敏染料市场动态和进展 总被引:1,自引:0,他引:1
热敏染料是用于感热记录纸的发色剂。它不同于一般的染料和有机颜料,后者呈共轭体系,自身发色,具有染着于纤维或使塑料等着色的机能,而热敏染料的共轭体系中断成为无色态。当小型发热元件产生热能信息作用在感热记录纸上,加热部位的热敏染料和显色剂一起熔融发生 相似文献
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本文简介了压敏、热敏染料的起源,介绍了国内外压敏、热敏的染料和压敏复写纸及热敏记录纸的现状与发展,并对我国今后在该领域的发展提出了几点建议。 相似文献
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压敏热敏染料的光氧化及阻氧效果 总被引:1,自引:0,他引:1
介绍了紫外线吸收剂和酸对压、热敏染料光氧化退色的阻止效果。浅析了压、热敏染料光氧化分解的机理。认为荧烷系比异苯骈呋喃酮系染料耐光性能好。 相似文献
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前言芳香族氟化物除在医药、农药两大领域应用十分广泛之外,另一重要应用领域就是染料工业。近年来,作为染料工业一个重要门类的压敏、热敏染料发展十分迅速。据报导,目前全世界光用于压敏纸的染料产量就达4,500t/a,用于热敏纸的染料也在1,800~2,000 t/a,是产量最大的一类功能性染料。其中日本产量最大,压敏染料产量在1,000~1,500 t/a,约占世界总量的30%;热敏染料为700t/a,约占世界总量40%。全世界压敏,热敏纸的产量达2,000万 t/a 以上。 相似文献
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热敏染料生产废水是典型的高COD、高盐分、难降解精细化工废水,普通的物化-生化处理工艺无法实现达标排放的目标。该文以山东某精细化工厂热敏染料废水为研究对象,首先对不同水质的废水分别采用蒸发脱盐、混凝沉淀、中和沉淀等方法进行预处理,然后将预处理过的废水与其它一些不需要预处理的废水按比例混合在一起进行生化处理,最后再用Fenton试剂氧化法对二级生化出水进行后处理,以实现达标排放的目标。试验结果表明,物化预处理、生化处理和Fenton试剂氧化后处理组合工艺处理热敏染料废水是可行的,最终出水COD低于排放限值。 相似文献
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压敏、热敏染料及其中间体的合成技术进展 总被引:2,自引:0,他引:2
论述了压敏、热敏染料及其中间体的合成技术。对已有的合成方法进行了概括和对比。简述了我们所进行的研究工作。对国外技术动向进行了探讨。 相似文献
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The new flame‐retardant plywood was manufactured by adding expanded vermiculite (EVMT) in the adhesive and by surface treatment as a flame‐retardant coating. The study discussed the effect of EVMT to the limited oxygen index values of samples. The thermal degradation process of plywood samples has been investigated by thermal analysis. The result showed that EVMT increased all the limited oxygen index values of the treated samples and decreased the thermal activation energy at a high degree of degradation. Scanning electron microscope (FEI, Holland, The Netherlands) images showed that EVMT could form a protective coating, which improved the flame retardancy of plywood. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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吡啶分别与4种二卤代烃进行N-烷基化反应得到4种双阳离子吡啶基离子型卤化物,再与硝酸银进行阴离子交换得到4种相应的硝酸盐。分别对它们的结构进行了1HNMR1、3CNMR表征,并测定了它们的溶解性及热稳定性。结果表明,这8种双阳离子型化合物的溶解性相似,易溶于极性溶剂,难溶于非极性溶剂。在8种双阳离子吡啶基离子型化合物中,氯化物的热稳定性要高于相应的硝酸盐。随着连接双阳离子的烃基增大,相同阴离子的双阳离子化合物的热稳定性增加。而且双阳离子吡啶基离子型化合物的热稳定性高于含相同阴离子的单阳离子吡啶基离子液。 相似文献
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Study of Nano-Porous Silicon with Low Thermal Conductivity as Thermal Insulating Material 总被引:1,自引:0,他引:1
V. Lysenko Ph. Roussel B. Remaki G. Delhomme A. Dittmar D. Barbier V. Strikha C. Martelet 《Journal of Porous Materials》2000,7(1-3):177-182
Recently discovered phenomenon of extremely low thermal conductivity of nano-porous silicon (nano-PS) is discussed in detail. A theoretical model describing specific mechanisms of heat transport in as-prepared and oxidized nano-PS layers is described. The theoretical estimations are in a good agreement with experimental data obtained earlier. The low thermal conductivity values allow to use this promising material as thermal insulator in microsensors and microsystems. To ensure an efficient thermal isolation, a nano-PS layer has to be as thick as possible and mechanically stable. We describe here the procedures to form thick (up to 200 m) and stable nano-PS layers. Distribution of Si oxidized fraction along the layer thickness after thermal oxidation in dry O2 atmosphere at 300°C during 1 h is studied. 相似文献
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Abstract The thermal treatment of wood has many benefits such as better dimensional stability and attractive dark color and does not use toxic chemicals. The resistance against biological decay can be improved when wood is not in contact with ground. On the other hand, after thermal transformation, wood becomes more fragile. The changes of the wood properties are related to the modification of the wood composition. During the thermal treatment, the evaporation of the moisture content is not the only event. Volatile extractives are evacuated from the wood, while new products and by-products of different chemical reactions appear. The comparison of the extracts obtained from untreated and treated wood can help to identify thermo-chemical reactions, taking place during the heat treatment. This article presents the analysis by Gas Chromatography–Mass Spectroscopy (GC-MS), High Performance Liquid Chromatography (HPLC), and Thin Layer Chromatography (TLC) of polar and non-polar extracts of untreated and heat-treated North American Jack pine (Pinus banksiana). The study of the impact of maximum heat treatment temperature on the composition of the Jack pine extracts showed that the major part of extractives leaves the wood under 200°C whereas most of the new products appear only above 200°C. While the extractives of the untreated Jack pine are dominated by non-polar components, the thermo-transformation seems to generate mainly polar compounds. However, presence of water vapor increases the portion of polar extractives in wood. Interestingly, an important decrease of concentration of phenolic compounds (such as pinosylvin, pinosylvin monomethyl ether, and pinobanksin) in Jack pine wood was observed between 160–200°C. On the other hand, 4-hydroxy-methylfurfural and vanillin have been identified as compounds generated by the heat treatment above 200°C. The identification of other by-products will be presented in a later paper. 相似文献
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聚氯乙烯热稳定剂研究和应用的新进展 总被引:7,自引:0,他引:7
聚氯乙烯(PVC)是产量仅次于聚烯烃的塑料品种。随着环境保护要求的提高,交效、无毒热稳定剂的开发和应用成为聚氯乙烯研究的重要内容。本文对近十年来国内外在PVC的热稳定方面包括传统热稳定剂和新型热稳定剂所作的研究工作进行了总结,同时指出,若要完全取代有毒的铅盐稳定剂,还有许多工作要做。 相似文献