阴极电泳涂料用颜料分散树脂及颜料浆的研制

采用多异氰酸酯制备一种季铵化剂,该季铵化剂和环氧树脂反应制备含有季铵盐基团的阳离子颜料分散树脂及颜料浆。本文研究了TDI单体类型、环氧树脂分子量、IO封闭TDI摩尔比例对颜料分散树脂水溶性、分散性及颜料浆稳定性的影响,并对颜料分散树脂和颜料浆的性能进行测试,结果表明:该颜料分散树脂对颜料具有优异的分散效果;该颜料分散树脂和常见颜料分散研磨而成的颜料浆贮存稳定性、施工稳定性性能优异,该产品具有良好的市场应用前景。     

形形色色的化学颜料

以天然颜料和合成颜料为主线对颜料的发展过程做一个概述,并以应用较多的颜料种类为例进行阐述,以便使人们更加深入地了解颜料,充分发挥其作用。     

色素类胆结石难溶原因的分析

本文采用不同的溶剂对溶解前后的胆色素类结石进行了超微结构的观测.并用能谱仪对溶解前后的胆色素类结石进行了主要元素的检测,同时对特征色素类结石进行了有机元素分析.通过比较溶解前后超微结构和各种元素含量的变化,认为胆红素与金属离子,尤其是钙及其它二价金属离子,形成了胆色素盐或配位给合物,并与糖蛋白等螯合成了大分子复合物,这是胆色素类结石难溶的主要原因.     

天然多功能食用色素的研究进展

介绍了天然多功能食用色素的新品种、制备方法、纯化方法和改性研究的进展,并分析了天然多功能食用色素的发展趋势。     

铝酸锶荧光粉的表面包覆

用Na2SiO3对铝酸锶进行二氧化硅包膜以改善其耐水性。检测结果表明,产品被二氧化硅完整紧密包覆,表现出优良的耐水性能。在纯水中,原样6h内即完全水解,而产品在48h后无水解。同时,包膜对颜料的发光性能影响很小,发射光和激发光强度损失在1%左右。     

Phytochrome,the Visual Pigment of Plants

Plants require light for photosynthesis. In order to adapt to the light conditions in their particular habitat, they have developed various photoreceptor systems. Of these, phytochrome allows even two-color vision in the red/far-red region. The photoreceptor phytochrome is of interest not only to botanists, but also to natural product chemists, photochemists, biochemists, photobiologists, and recently molecular biologists. Despite numerous studies, there are still considerable gaps in our knowledge of this photoreceptor. This article first describes the basic structural studies of the tetrapyrrole chromophore and its photochemical cis–trans isomerization, which is the source of the chromoprotein's photochromism. In the section on the protein moiety, beside other topics, the domain structure of phytochrome and the conformational changes during phototransformation are discussed. Finally, the known phytochrome genes are used to derive phylogenetic relationships, and possible structure–function relationships are discussed.     

A Review on the Mechanism of Pigment Dispersion

In the quest of ensuring successful pigment dispersion, additives are used to aid dispersion and stabilization of pigment particles through attraction forces of various chemical nature including van der waals and “liquid bridge” forces as well as anchor groups with high affinity for pigment surface. On the other hand, dispersion efficiency is significantly dependent on the effectiveness of various dispersion equipment and their energy transfer, dispersion force and effectiveness. The common denominator for all this equipment are that; dispersion is achieved by shearing forces produced by the application of high positive and negative attrition. This article reviews and explores the nature and the significance of the various methods and forces in pigment dispersion and the various stabilization mechanisms adopted in producing stably fine pigment particles, dispersion application as well as future prospects.     

静电复印用双偶氮颜料的研究

合成了含邻氯双偶氮颜料,借助元素分析、红外光谱、吸收光谱、X射线粉末衍射等对其结构与性能进行了表征,并制成了功能分离型结构的有机光导器件。光电特性显示,该器件对可见光有很好的敏感性,是一种良好的静电复印用有机光导材料。     

食用油中微量颜料的分析鉴定

某商场送出的礼品锅在使用时食油变成蓝绿色.为了对消费者的健康和安全负责,必须对蓝色物质作出科学的鉴定.本文报道对食油中蓝色物质的分析鉴定过程.     

有机颜料与表面活性剂DBS混合物的光催化降解

以TiO₂为光催化剂,研究了表面活性剂十二烷基苯磺酸钠(DBS)和有机颜料耐晒大红BBN(BBN)为混合组分的光催化降解,结果表明,pH值、底物的用量对体系的降解有显著影响,在碱性条件下,DBS的降解速率相对较快,而在酸性环境时,颜料的降解较快,在TiO₂等电点时,降解最慢,酸性条件下, TiO₂对BBN和DBS的吸附性比在碱性和中性环境中大,BBN/DBS体系中, DBS增大了BBN的水溶性,但是没有明显提高BBN的降解褪色速度,DBS浓度为0.42 g/L时,颜料降解最快,0.042 g/L时次之,2.1 g/L时最低,在BBN降解过程中DBS自身也被降解,且略有促进作用。     

Post-treatment of Fungal Biomass to Enhance Pigment Production

Applied Biochemistry and Biotechnology - A new post-treatment method of fungal biomass after fermentation is revealed. The post-treatment strategy was utilized to produce pigments as an additional...     

北醌类光敏色素的生物催化合成

北醌化合物是一类具有光敏活性的色素 .近年来 ,发现它们具有良好的光敏杀伤肿瘤细胞[1] 和抑制爱滋病病毒 HIV- 1的作用 [2 ] ,曾用于治疗皮肤病和皮肤癌[3 ] .而且北醌化合物还是潜在的新型光电转换材料 [4 ] .赵晨等人合成了这类具有独特立体结构的真菌次生代谢产物的北醌衍生物 ,并将其用作竹红菌素的前体 [5,6] .Broka[7]采用十几步反应合成了 3种北醌化合物 .生物合成作为 2 1世纪的新兴学科 ,正在迅速发展 .利用生物合成目标分子化合物 ,以专一性、低成本见长 .由于现有竹红菌资源有限 ,化学合成成本太高 ,严重地制约了这类药物的…     

Dyeing of Lyocell Fabrics with Pigment Dispersion Systems

Lyocell fabrics modified by cationic reagent were dyed with conventional and nanoscale pigment dispersions respectively. The color yield and fastness properties were measured. It is found that the color yield and fastness properties of the dyed lyocell fabrics are influenced by the cationic reagent concentration, the cationization pH, time, and temperature. It is also found that the nanoscale pigment system can give the lyocell fabric a higher K/S value but with lower rub and wash fastness. The wet abrasion time, which is used to indicate the fibrillation tendency of lyocell fabrics, was also measured after the cationization and pigment dyeing. The results show that the multifunctional cationic reagent and the pigment on the lyocell surface could increase the wet abrasion time but by different mechanisms.     

The Glycemic Control Potential of Some Amaranthaceae Plants,with Particular Reference to In Vivo Antidiabetic Potential of Agathophora alopecuroides

Natural products continue to provide inspiring moieties for the treatment of various diseases. In this regard, investigation of wild plants, which have not been previously explored, is a promising strategy for reaching medicinally useful drugs. The present study aims to investigate the antidiabetic potential of nine Amaranthaceae plants: Agathophora alopecuroides, Anabasis lachnantha, Atriplex leucoclada, Cornulaca aucheri, Halothamnus bottae, Halothamnus iraqensis, Salicornia persia, Salsola arabica, and Salsola villosa, growing in the Qassim area, the Kingdom of Saudi Arabia. The antidiabetic activity of the hydroalcoholic extracts was assessed using in vitro testing of α-glucosidase and α-amylase inhibitory effects. Among the nine tested extracts, A. alopecuroides extract (AAE) displayed potent inhibitory activity against α-glucosidase enzyme with IC₅₀ 117.9 µg/mL noting better activity than Acarbose (IC₅₀ 191.4 µg/mL). Furthermore, AAE displayed the highest α- amylase inhibitory activity among the nine tested extracts, with IC₅₀ 90.9 µg/mL. Based upon in vitro testing results, the antidiabetic activity of the two doses (100 and 200 mg/kg) of AAE was studied in normoglycemic and streptozotocin (STZ)-induced diabetic mice. The effects of the extract on body weight, food and water intakes, random blood glucose level (RBGL), fasting blood glucose level (FBGL), insulin, total cholesterol, and triglycerides levels were investigated. Results indicated that oral administration of the two doses of AAE showed a significant dose-dependent increase (p < 0.05) in the body weight and serum insulin level, as well as a significant decrease in food and water intake, RBGL, FBGL, total cholesterol, and triglyceride levels, in STZ-induced diabetic mice, compared with the diabetic control group. Meanwhile, no significant differences of both extract doses were observed in normoglycemic mice when compared with normal control animals. This study revealed a promising antidiabetic activity of the wild plant A. alopecuroides.     

C.I. Pigment Red 266

C.I. Pigment Red 266, or 4‐{[4‐(amino­carbonyl)­phenyl]­hydraz­ono}‐N‐(2‐methoxy­phenyl)‐3‐oxo‐3,4‐di­hydro­naph­tha­l­ene‐2‐carbox­amide, C₂₅H₂₀N₄O₄, adopts the keto–hydrazone tautomeric form with significant intramolecular hydrogen bonding. The mol­ecules pack to form layers involving an extensive network of intermolecular hydrogen bonds, in which the primary amide group plays a prominent role. The good technical performance of this pigment in application may be attributed principally to the pattern of intra‐ and intermolecular hydrogen bonding.     

A Diketopyrrolopyrrole-Based Dimer as a Blue Pigment

1,4-Diketopyrrolo[3,4-c]pyrroles (DPPs) constitute a class of hydrogen-bonded pigments covering a color range from yellow–orange to dark violet. We report facile dimerization of a Boc-substituted 3,6-dithienyl-DPP. The formed dimer shows brilliantly blue color as a result of the expansion of the chromophore. The soluble dimer acts as latent pigment and is converted to the corresponding pigment either via thermocleavage or acidic deprotection of the Boc groups. The synthesized pigment is characterized by high migrational stability in a polymer matrix and a clear blue color.     

取代基对偶氮类颜料光伏特性的影响

偶氮类材料由于其具有成本低、来源丰富、易于加工以及可以通过接不同性质的取代基得到不同性能的光电导体等优点 ,作为光接受器材料 ,其导电类型、光生电荷及传输过程以及光照后表面电荷的种类在静电复印、激光打印中起着决定性的作用 [1～ 3] .由于取代基会影响偶氮类材料的费米能级 (电子填充水平 ) ,从而影响其导电类型 .如何判断其导电类型以及光照后表面电荷的种类还是一个难题 .本文首次利用 SPS(表面光电压谱 )和 FISPS(场诱导表面光电压谱 )技术对几种具有不同取代基的双偶氮类有机颜料的光伏特性进行了研究 ,发现取代基对它们…