三氯乙醛连续蒸馏技术工艺

简要介绍了三氯乙醛连续蒸馏的新工艺特点及影响生产的一些因素。     

Comparison study of two aldehyde group finishing agents in surface modification of up-conversion luminescence materials

Surface modification of up-conversion luminescence materials (Na[Y0.57Yb0.39Er0.04]F4 modified by amino groups) by grafting and modifying with aldehyde groups was studied by means of Fourier transform infrared spectroscopy (FFIR),scanning electron microscopy (SEM),thermogravimetric analysis (TGA),and emission spectrum (EM).The surface modification effect was compared using two different finishing agents,p-phthalaldehyde and glutaraldehyde.It was found that the surface of up-conversion luminescence materials could be modified by aldehyde groups of the two finishing agents,the systematic dispersibility and the thermostability of the up-conversion luminescence material modified by p-phthalaldehyde were better than those of the material modified by glutaraldehyde,and the luminous intensity of the material modified by p-phthalaldehyde was increased.The AI (the ratio of the suspended segmental quality in the specimen to the total mass of the specimen) of the material modified by p-phthalaldehyde was higher than that of the material modified by glutaraldehyde.It is obviously seen that the embellishment effect of p-phthalaldehyde as a finishing agent was better than that of glutaraldehyde.In addition,the reasons why p-phthalaldehyde is a good finishing agent are also explained.     

Synthesis and characterization of new 4‐tolyldiphenylamine derivatives for hole transporting polymers

New hole transport polymers have been synthesized by condensation polymerization of 4‐tolyldiphenylamine (TDPA) with various types of aldehyde. The reaction conditions have been investigated to yield polymers with high molecular weight. It is found that the molecular weight and yield of the TDPA–aldehyde polymers strongly depend on the electron donor–acceptor nature of the substituent on the aromatic ring of the aldehyde monomer. Structural characterization by ¹H NMR spectroscopy shows that the addition condensation reaction occurs exclusively at the para position of TDPA. The electrochemical and optical properties of polymers have been investigated by cyclic voltammetry and UV–vis spectroscopy. Cyclic voltammograms of all polymers show well‐defined pairs of reduction and oxidation peaks, indicating that the polymers are electrochemically active. All polymers show low conductivities of magnitude 10^?14 S cm^?1. Differential scanning calori‐metry measurements reveal that TDPA–aldehyde polymers exhibit glass transitions in the range 170–230 °C. These polymers possess good solubility and the films show sufficient morphological stability. © 2001 Society of Chemical Industry     

广州国际体育演艺中心屋面工程施工技术

广州国际体育演艺中心屋面工程施工面积约16000m2,由下至上设7个构造层,以满足防水、保温隔热、防火、隔气、隔声等多种功能要求,施工工序较繁琐,工艺复杂。该屋面还采用了覆铝箔酚醛发泡保温板和TPO防水卷材。施工中抓重要工序及节点施工质量控制,高效率、高质量地完成了屋面施工。     

脂肪醛AAT在铬鞣软革及无铬鞣软革中的应用

一种新型国产脂肪醛鞣剂AAT，分别用于猪正面服装革、水牛沙发革的复鞣、与栲胶联合鞣制猪皮服装革。实验表明，其性能在各个方面与进口脂肪醛相当。ATT用于复鞣能赋予皮革柔软、丰满的手感和弹性，所得皮革粒面细致；用于无铬少铬鞣制作软面革时，能提高皮革的稳定性和收缩温度，减少铬盐用量。脂肪醛AAT已经具备了高端皮化产品应有的特性，值得推广。     

Protective effects of Lactococcus chungangensis CAU 28 on alcohol-metabolizing enzyme activity in rats

In this study, we investigated the beneficial effects of Lactococcus chungangensis CAU 28, a bacterial strain of nondairy origin, on alcohol metabolism in rats treated with ethanol, focusing on alcohol elimination and prevention of damage and comparing the effects with those observed for Lactococcus lactis ssp. lactis ATCC 19435. Male Sprague-Dawley rats were orally administered 20% ethanol and 3 substrates (freeze-dried cells, cream cheese, and yogurt) containing Lc. chungangensis CAU 28 or Lc. lactis ssp. lactis ATCC 19435, which were provided 1 h before or 1 h after ethanol ingestion. Blood samples were collected from the tail veins of the rats at 1, 3, 6, 12, and 24 h after ingestion of ethanol, Lc. chungangensis CAU 28 substrate, or Lc. lactis ssp. lactis ATCC 19435 substrate. Alcohol and acetaldehyde concentrations in the Lc. chungangensis CAU 28 substrate-treated rats were significantly reduced in a time-dependent manner compared with those in the Lc. lactis ssp. lactis ATCC 19435 substrate-treated rats. Among the experimental groups, treatment with cream cheese before ingestion of 20% ethanol was found to be the most effective method for reducing both alcohol and acetaldehyde levels in the blood. Alanine aminotransferase and aspartate aminotransferase activities in the Lc. chungangensis CAU 28 substrate-treated rats were significantly lower than those in the positive controls. Moreover, in the Lc. chungangensis CAU 28 cream cheese-treated group, rats showed a reduction of liver enzymes by up to 60%, with good effectiveness observed for both pre- and post-ethanol ingestion. These results suggested that intake of lactic acid bacteria, particularly in Lc. chungangensis CAU 28-supplemented dairy products, may reduce blood alcohol and acetaldehyde concentrations, thereby mitigating acute alcohol-induced hepatotoxicity by altering alcohol-metabolizing enzyme activities.