聚乙烯亚胺-松香改性聚羟基酸酯类超分散剂的研发

以松香和12-羟基月桂酸为原料合成溶剂化部分。12-羟基月桂酸在160℃-180℃时用二甲苯为溶剂,在催化剂和氮气保护下反应18小时,生成N=6聚羟基酸酯链。树脂酸与聚羟基酸酯的酯化反应温度为200℃～205℃,氧化二丁基锡作催化剂生成松香改性溶剂化链;再与高分支聚乙烯亚胺(分子量1200)反应合成标题化合物。此分散剂应用于高固体颜料浓缩物(颜料含量40%-60%)在有机溶剂中的分散取得了很好的效果。     

效应颜料--现在和未来(续)

综述了效应颜料的类别、作用机理、制备方法及其未来的发展方向.     

Influence of heat‐stabilization on supermolecular structure of colored PP fibers

Investigations of supermolecular structure and tensile properties of colored heat‐stabilized fibers were carried out. For fiber coloring, chosen organic pigments with differentiated nucleating properties were used. It was stated that during the fiber formation, a fibrillar–lamellar structure with α‐crystals is formed. In fibers colored with a quinacridone pigment, the minimal number of β‐crystals was observed. During heat‐stabilization, perfecting of the supermolecular structure of the fiber occurs. Because of pigments, the process of rebuilding occurs more intensively and leads to formation of a more stable structure with higher crystallinity. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 477–488, 1999     

染色促进剂的合成及在涂料浸染中的应用

采用预处理的方法,通过化学反应在纤维上引入聚酰胺使其改性并进行涂料染色。讨论了预处理条件对织物染色深度（K／S值）的影响。结果表明,经过聚酰胺改性的纤维,其染色深度大幅度提高。     

亚麻棉涂料浸染工艺研究(上)

对亚麻棉织物用涂料浸染方法进行工艺研究,选用了阳离子处理剂Hoe DP Fixer2LC和阳离子处理剂K2—76K对织物进行前处理,以改变纤维表面的带电性能,来吸附涂料粒子上染,对其上染性能、染色牢度、手感等性能进行研究。     

Photodegradation of Lipofuscin in Suspension and in ARPE-19 Cells and the Similarity of Fluorescence of the Photodegradation Product with Oxidized Docosahexaenoate

Retinal lipofuscin accumulates with age in the retinal pigment epithelium (RPE), where its fluorescence properties are used to assess retinal health. It was observed that there is a decrease in lipofuscin fluorescence above the age of 75 years and in the early stages of age-related macular degeneration (AMD). The purpose of this study was to investigate the response of lipofuscin isolated from human RPE and lipofuscin-laden cells to visible light, and to determine whether an abundant component of lipofuscin, docosahexaenoate (DHA), can contribute to lipofuscin fluorescence upon oxidation. Exposure of lipofuscin to visible light leads to a decrease in its long-wavelength fluorescence at about 610 nm, with a concomitant increase in the short-wavelength fluorescence. The emission spectrum of photodegraded lipofuscin exhibits similarity with that of oxidized DHA. Exposure of lipofuscin-laden cells to light leads to a loss of lipofuscin granules from cells, while retaining cell viability. The spectral changes in fluorescence in lipofuscin-laden cells resemble those seen during photodegradation of isolated lipofuscin. Our results demonstrate that fluorescence emission spectra, together with quantitation of the intensity of long-wavelength fluorescence, can serve as a marker useful for lipofuscin quantification and for monitoring its oxidation, and hence useful for screening the retina for increased oxidative damage and early AMD-related changes.     

粉单竹竹青色素提取工艺及其成分分析

以乙醇为提取溶剂,采用超声波提取粉单竹竹青色素,通过单因素实验,获得竹青色素最佳提取条件为:乙醇浓度90%,料液比1∶35,超声时间40 min,超声温度55℃,提取两次。实验结果表明,在最佳提取条件下粉单竹竹青叶绿素提取率为0.39%;色素纯化后通过柱层析分离得到橙黄色、蓝绿色、黄色、绿色4种色素,在紫外可见光区(400~800 nm)测4种色素紫外光谱图,发现该图形分别与叶绿素a、叶绿素b和两种类胡萝卜素的谱图相似;通过核磁共振分析,纯化后的提取物中可能含有脂肪酸,甾醇等;通过红外光谱分析可知,提取液中含有羟基、C=C双键、C=O双键、C—O键等官能团。     

萃取精馏技术在环己醇生产中的应用

介绍了萃取精馏的基本原理,萃取剂选择时要考虑的几个影响因素,在环己醇生产中应用N,N-二甲基乙酰胺作萃取剂,通过萃取精馏将苯加氢反应后的混合物料中的苯、环己烯、环己烷有效分离为纯组分,并对萃取精馏过程中蒸汽温度、塔的操作压力和混合物中水分等因素对系统的影响作了简要分析.     

采用沸石颜料的喷墨打印纸用胶黏剂的研究

使用沸石作为单一的喷墨打印纸颜料,采用单因素控制变量法初步探讨了3种胶黏剂PVA-1788、PVA-1799和羧基丁苯胶乳对采用沸石颜料的喷墨打印纸性能的影响.采用物理性能(如白度、不透明度、光泽度、PPS粗糙度、动态接触角)和打印性能(如黄、品、青、黑四色实地密度、CIE L*、a*、b*值和色差△E*Lab值等)对喷墨打印纸性能进行表征.实验结果表明,对采用沸石颜料的喷墨打印纸,PVA-1788是所选3种胶黏剂中的最佳胶黏剂,且其最佳用量20份(相对于100份绝干沸石颜料).     

290例外源性皮肤色素病变激光治疗体会

应用调Q开关激光选择波长Q1064nnm、755nm或532am治疗外源性皮肤色素病变290例。结果290例中一次治愈194例,其余病例2-4次治愈,总有效率100％。是目前临床治疗外源性皮肤色素病变较理想的方法。