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二磺基类的荧光增白剂因为增白性能好、对纤维的亲和性高的优点而逐步得到广泛应用。但是,此类荧光增白剂分子结构中仅有2个磺酸基,水溶性、耐酸性较差,这影响了该荧光增白剂的应用,因而许多公司针对此类荧光增白剂的稳定性作出了大量研究,并据此申请了专利。文章将对近20年以来国内外荧光增白剂生产商对荧光增白剂液体制剂的改进进行介绍。 相似文献
996.
Mineralization of Para-Chlorobenzoic Acid in Water by Cobalt-Incorporated MCM-41 Catalyzed Ozonation
Cobalt-incorporated MCM-41(Co-MCM-41) was used as a heterogeneous catalyst for the ozonation of para-chlorobenzoic acid (p-CBA) in aqueous solution. Cobalt oxide supported on MCM-41(Co/MCM-41) was synthesized for comparison. Their textural properties were elucidated by various characterization techniques to understand the relationship between surface texture and catalytic activity. TOC removal at 60 min reached 91% with Co-MCM-41, 83% with Co/MCM-41 and only 52% with ozone alone, respectively. Observations from diffuse reflection spectroscopy demonstrated that different metal phases were formed in these cobalt-modified molecular sieves samples. Radical scavenger experiments indicated the formation of hydroxyl radicals that were responsible for the effective degradation of p-CBA. An integrated approach to the catalytic mechanism was proposed by considering the variation of pH in the course of ozonation as well as its subsequent influence on the dissociation of targeted compounds and surface charge of the catalyst. In the reusability experiments, the reused Co-MCM-41 was able to regain the same catalytic capability as the fresh one within 5 cycles. X-ray photoelectron spectroscopy results indicated that a part of Co2+ was oxidized to Co3+ after oxidation reaction. 相似文献
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Bao‐Xin Du Zheng‐Jun Quan Yu‐Xia Da Zhang Zhang Xi‐Cun Wang 《Advanced Synthesis \u0026amp; Catalysis》2015,357(6):1270-1276
A general protocol for the chemoselectivity‐controlled C C and C S coupling reactions of di(hetero)aryl disulfides with Grignard reagents catalyzed by ferrocene and palladium acetate has been developed. Ferrocene favored the formation of C S coupled products at low temperature, whereas C C bond couplings were favored when palladium acetate was used. All the reactions proceeded with excellent chemoselectivity and in good yields under mild conditions, and a library of molecules with pyridine and pyrimidine scaffolds was produced.
999.
乳化萃取是强化溶剂萃取的有效方法,可大大缩短反应时间、减小设备占地面积、提高萃取效率,但技术瓶颈是形成的乳状液破乳困难。采用了重力沉降和搅拌剪切法对乳化过程形成的油包水乳状液破乳,研究了2种方法的破乳机理、破乳率及破乳前后乳液微观粒径、显微镜图像的演变过程。结果表明:2种破乳方法结合可取得良好的破乳效果,破乳后两相间有明显的相界面,连续相内悬浮液滴数量急剧减少且液滴粒径显著变大,分布变窄。实验确定适宜的操作条件:搅拌速度为180 r/min、搅拌时间为5 min、静置时间为8 min,在此条件下破乳率可达到96%,临界液滴粒径为15 μm。 相似文献
1000.
Improved dispersibility of multi‐wall carbon nanotubes with reversible addition–fragmentation chain transfer polymer modification 下载免费PDF全文
Chenfei Yu Qiang Chen Anqi Wang Xi Zhou Shishan Wu Qianping Ran 《Polymer International》2015,64(9):1219-1224
A non‐covalent approach is used to modify multi‐wall carbon nanotubes (MWCNTs) via a block polymer that can be synthesized in aqueous solvent through reversible addition–fragmentation chain transfer polymerization. The block polymer consists of oligo(ethylene glycol) methyl ether acrylate and acrylic acid. The hydrophobic backbone is significantly adsorbed on hydrophobic MWCNT surfaces, which is verified using transmission electron microscopy, thermogravimetric analysis and X‐ray photoelectron spectroscopy. The coated block polymer can prevent the aggregation of MWCNTs and improve their dispersibility in water. The MWCNTs after modification are stable in water even after standing in a long‐term test. © 2015 Society of Chemical Industry 相似文献