电泳涂料

本文介绍了电泳涂料及发展趋势。     

聚砜酰胺的分子量对其超滤膜性能的影响——Ⅲ.热性能

对不同分子量的PSA 材料和由其制成的超滤膜的TGA、DSC 及FTIR 研究表明,PSA 会以氢键的形式吸附水份,被吸附的水份主要以单分子形式存在,双聚或多聚的也有,但较少;并且在温度升到40℃左右将全部游离出来,在120℃左右则全部气化离开PSA。PSA 材料在400℃以上才开始分解,其耐热性能随分子量的增大而降低。凝胶浴不同对PSA 膜的晶态影响不大。     

新型阳离子紫外光引发剂碘锚盐的光谱表征及分析

采用紫外光谱法(UV)分析新型阳离子光引发剂二甲苯基碘六氟磷酸盐。系统研究了UV法测试条件,采用氯仿重结晶提纯样品、以无水乙醇为溶剂、在λmax=236 nm测吸光度,ε=1.8421×104L.mol-1.cm-1,线性范围为1~80 mg.L-1,加标回收率为99.0%。     

国外过氧化氢在化学合成中应用研究进展

介绍了近期国外过氧化氢在部分化学品合成中应用研究新进展 ,产品包括过碳酸钠、过碳酰胺、4Na2 SO4·2H2 O2 ·NaCl加合物、叔胺氧化物、水合肼、二羟基苯、季铵盐过氧化氢和甲乙酮肟。内容涉及产品质量 (纯度、安定性、溶解速率、外观等 )、产品收率、催化剂、工艺过程等方面改进。主要介绍专利技术。     

十六烷基三甲基季铵阳离子改良二氧化硅对酸性染料的吸着

The sorption behavior of acid dyes onto cetyltrimethylammonium bromide (CTAB)-modified silica as a function of pH in the aqueous medium was studied. Single-and multi-solute sorption equilibria of orange Ⅱ（OR), phenol red (PR) and Eriochrome Black T (EBT) were studied at pH 3, unbuffered water pH and pH 11. Sorption behavior of EBT could not be conducted at pH3 due to its aggregation in acidic medium. All the reaction conditions, experimental protocols and techniques remained the same throughout the sorption process. Sorption isotherms for single-solute system were fitted by the Langmuir model, while Langmuir competitive model (LCM) and the ideal adsorbed solution theory (IAST) coupled with Langmuir model (IAST/Langmuir) were used for the prediction of multisolute competitive sorption. Sorption affinities influenced by the factors like physical interactive forces between the molecules of CTA on silica and sorbate, structural limitations of the dyes based on their geometrical arrangement were investigated. Sorption affinity of OR was found to be higher than that of EBT and PR at all the pH values investigated. Magnitude of the sorption capacities was observed to be higher in acidic medium but lower in alkaline medium. Trends of the sorption affinities in multisolute system were simlar to those in single-solute system but magnitude of the sorption capacities was significantly reduced due to the prevailing competition among the sorbates.     

前景广阔的过碳酸酰胺

过碳酸酰胺，又名氧化尿素。分子式CO（NH２）·H２O２，白色结晶粉末。可溶于各种有机溶剂，如甲醇、甘油、乙醇、乙醚、丙酮等，且溶解度相当大。易溶于水，其水溶液兼有过氧化氢和碳酸酰胺的性质，在水中能缓慢释放出氧气。干燥的过碳酸酰胺在低温密闭条件下保存期较长，其理论活性氧含量为１７．０２％。过碳酸酰胺的活性氧含量及在水中的溶解度皆明显高于过碳酸钠，由于过碳酸酰胺为弱酸性，因此在水溶液中的稳定性优于过碳酸钠，过碳酸酰胺在某些用途上有可能替代过碳酸钠。目前，过碳酸酰胺的主要生产国家为美国、日本和西欧。而…     

聚酯酰胺热熔胶的合成及其性能研究

研究了以聚酯胶和聚酰胺胶为原料在催化剂作用下加热共熔,通过大分子链交换反应制备织物用聚酯酰胺热熔胶的方法。用聚酯胶的溶剂对所得产品进行溶取试验并且通过红外光谱分析都证明了链交换反应的存在。用该法所得产品粘接强度大,既耐水洗又耐干洗,适用于粘合衬生产。     

阳离子淀粉的合成及应用

本文阐述了七种阳离子淀粉的化学合成反应。重点论述ＣＳ－３淀粉的反应机理，并结合工业生产指出阳离子淀粉的合成中重要的技术问题：另外还利用重复取样的方差分析方法确定ＣＳ－３淀粉的工艺操作条件及主要影响因素。