Resistance of metallic substrates protected by an organic coating containing glass flakes

The resistance against corrosion of an epoxy-polyamine-based coating immersed in a 3 wt.% sodium chloride solution was investigated by electrochemical impedance spectroscopy (EIS). The organic coating contained glass flakes as pigment in order to enhance its barrier characteristics. The data show that this coating is more strongly adhered and exhibits higher protection characteristics when applied onto carbon steel substrates than on galvanized steel. Though the capacitance of the coating (C_C) does not show any appreciable variation with immersion time, the resistance (R_PO) of the film is observed to increase with time upon immersion. The analysis of the data sustains that the organic film behaves as a porous, non-barrier coating. Two time constants are observed even at earlier exposures, and the improved corrosion resistance developed after the coating system was exposed to the test electrolyte is considered to originate from the precipitation of corrosion products within the pores in the film.     

Estimating thermal performance of cool colored paints

The purpose of this study is to investigate the thermal performance of cool colored acrylic paints containing infrared reflective pigments in comparison to conventional colored acrylic paints of similar colors (white, brown and yellow) applied on sheets of corrugated fiber cement roofing. Evaluated properties are: color according to ASTM D 2244-89, the UV/VIS/NIR reflectance according to ASTM E 903-96, and thermal performance by exposure to infrared radiation emitted from a lamp with the measurement of surface temperatures of the specimens with thermocouples connected to a data logging system.Results demonstrated that the cool colored paint formulations produced significantly higher NIR reflectance than conventional paints of similar colors, and that the surface temperatures were more than 10 °C lower than those of conventional paints when exposed to infrared radiation. The study shows that cool paints enhance thermal comfort inside buildings, which can reduce air conditioning costs.     

Optimization of jujube peel pigment multivesicular liposome formulation and evaluation of the protective effect on UVB-induced photodamage

Jujube peel pigment (JP), an ideal natural water-soluble pigment extracted from jujube peel, mainly consists of flavonoids and possesses a wide range of physiological activities. In this study, JP-loaded multivesicular liposomes (JP-MVL) were prepared using the double emulsification method. JP-MVL was characterized, and its encapsulation efficiency was determined using the UV-Vis method. Furthermore, the release behavior and antioxidant capacity of JP-MVL were evaluated in vitro. The results displayed in the structure of JP-MVL were spherical with internal vesicles; the average particle size of JP-MVL was 5.63 μm, and the zeta potential was −69.50 mV. Analysis of the release results indicated that the best-fitting models in PBS (Phosphate buffered saline pH 7.4) and 0.9% NaCl were the Higuchi and first-order kinetic models, respectively. The cytotoxicity of JP-MVL at the appropriate concentrations was negligible and had a good protective effect against UVB-induced photodamage.     

酶法水解铬废物后的残余铬泥处理

酶法水解铬鞣革废物解决了鞣制和制革工艺中（削匀、革裁剪）的废物。这些废物中含有数量可观的蛋白原料和铬。一直以来都采用垃圾掩埋法处理它们，一方面会使蛋白原料被波费，另一方面也存在铬化合物会泄漏的危害。酶法水解交联蛋白的最终产物是蛋白水解物，已经发现了它们在一些新领域中的应用价值，残余的铬泥处理就是该文要讨论的问题。由于铬泥中较高的含铬量，它可广泛用于颜料生产中。但是如果小经过前处理，是无法用于颜料生产的。而在使用酶法水解铬废物时，加入了MgO作引发剂，这又是一个需待解决的问题。本文利用三步洗提法，调节所需pH值将残余铬泥中的Mg分离出来，有效率达84％。     

花色素苷的研究进展

花色素苷广泛存在于植物内，是重要的呈色物质之一。本文从其结构，性质，以及在人体和动物内的利用、消耗情况、安全性、功能作用、来源等方面对花色素苷全面论述，针对目前国内对花色素苷在动物和人体内的代谢吸收、生物利用率方面研究较少的情况，本文着重介绍了此方面，希望对有关方面的研究有所帮助。     

红曲红色素光稳定性测定方法探讨

对市售红曲红色素粉进行了分离,得到红色色素、桔红色色素和黄色色素,其最大吸收波长分别为490±5nm,374±5nm/490±5nm,367±5nm。在固定光源、固定照射距离的条件下对红色色素的光稳定性进行了测定,确定出了最适合的初始光照色素浓度为0.01%(吸光度为1.089),最适合的色素液厚度为4.5mm,光照1h红色素的保存率为35%。     

Application of a hydrolyzable cationic agent,poly(acryloxyethyl trimethylammonium chloride), in salt‐free reactive dyeing for good dyeing properties

Poly(acryloxyethyl trimethylammonium chloride) (PAOTAC), in which cationic groups were connected with the polymer skeleton through ester bonds, was applied in the salt‐free reactive dyeing of cotton with the aim of achieving good dyeing properties. Exhaust and exhaust–pad–steam dyeing procedures were used with the cotton cationized with PAOTAC in the absence of salt; for comparison, both dyeing procedures were also applied with the untreated cotton in the presence of salt. The dyeing results show that only the exhaust–pad–steam dyeing procedure was suitable for dyeing cationic cotton to achieve a high dye fixation. Color yields, colorimetric properties, fastness properties, dyeing levelness, and penetration behaviors with different dyeing methods were evaluated. Compared with the dyeings with untreated cotton in conventional exhaust dyeing, dyeings with cationic cotton in the exhaust–pad–steam procedure showed equivalent or even better fastness with generally higher color yields and good dye penetration. Possible reasons for the improved salt‐free dyeing properties were proposed, and the hydrolysis of ester bonds within PAOTAC under the dyeing conditions was proven by IR spectroscopy. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

铬铅颜料行业的现状及走向

通过对铅铬颜料现状的简要介绍,从政策导向、健康安全环保和应用领域等方面对铅铬颜料行业的处境进行了阐述,并对其走向进行了探讨。     

锆钒蓝色料固相法合成工艺的研究

系统地研究了原料的种类和组成，矿化剂的选择，烧成制度等工艺要素对固相法合成锆钒蓝色料质量的影响，采用XRD、DTA-TG和激光颗粒分析等测试方法对实验结果进行了分析和讨论，得出一些有益的结论。