超高温隧道窑用特种镁铬砖的性能

研究了再结合镁铬砖和低镁铬砖的理化性能和显微结构．对其残砖进行了同样的研究,并对二者进行了比较．结合使用情况,阐述了特种镁铬砖在超高温隧道窑使用过程中的变化机理．     

酸性铬蓝K固体石蜡碳糊修饰电极溶出伏安法测定痕量铅

在pH为8．5,0．2mol/L氨性缓冲底液中,以酸性铬蓝K（ACBK）为修饰剂,固体石蜡为粘合剂,制备了ACBK修饰碳糊电极。Pb2+以Pb-ACBK络合物的形式吸附在电极上,在-1．0V电位下电解,以阳极溶出伏安法测定Ph2+,在0．11V（vs.SCE）处有灵敏的氧化峰,其一次微分峰电流与Pb2+浓度在1．0×10-11～1．0×10-5mol/L范围内的对数呈良好的线性关系。此法的检测限为5．0×10-12mol/L。     

Synthesis of Citric Acrylate Oligomer and Its In-Situ Reaction with Chrome Tanned Collagen (Hide Powder)

Summary: The purpose of this study was to formulate the new combined system of acrylic and citric acids, which was prepared by free radical polymerization and esterification reaction at the same time to form citric-acrylate CAC oligomer. The presumable chemical structure of this oligomer and the reaction mechanism were investigated by different spectroscopic tools (¹H,¹³C-NMR and ATR-IR), GPC and TGA/DTA. The effect as masking agent of the eco-friendly oligomer (CAC) in the chrome tanning of the collagen and the pickling of the hide was approached by the study of the hydrothermal and mechanical properties of in-situ treated/grafted chrome tanned collagen (hide powder) and pickled hide, respectively. The use of citric acrylate CAC oligomer instead of the traditional strong acids resulted in significant improvement in chrome exhaustion and physical properties of the leather.     

酸性铬蓝K-高碘酸钾催化动力学光度法测定痕量铬

在酸性介质中,微量铬(Ⅵ)能显著催化高碘酸钾氧化酸性铬蓝K褪色.研究了该指示反应的动力学行为,建立了测定痕量铬的新催化动力学分析方法,方法的线性测定范围为1.0～10.0μg/25ml,检出限为(4.14×10-8)g/ml.本法可用于电镀废水中Cr(Ⅵ)的测定,结果满意.     

溴酸钾氧化酸性铬蓝K催化光度法测定痕量铜的研究

研究了在稀硫酸介质中，痕量铜催化溴酸钾氧化酸性铬蓝Ｋ的褪色反应，建立了一种高灵敏，高选择性测定痕量铜的新方法，方法的线性范围为０．００１２～０．１４ｍｇ／Ｌ，检出限为４．２×１０＾－７ｇ／Ｌ，用于水，茶叶和粮食中铜的测定，结果满意。     

铅铬黄粒子的微胶囊化及其表面形貌的表征

研究了铅铬黄粒子的微胶囊化及其机理；探讨了对粒子表面形貌的量化表征方法．结果表明，在油包水（Ｗ／Ｏ）乳液中对铅铬黄粒子进行无机微胶囊化是一提高其耐酸、碱性的有效方法．颜料粒子的表面形貌可用其表面分形维数（Ｄ）量化表征．     

铬鞣废液直接循环利用技术的研究与应用

采用淀粉改性水处理剂,并借助气浮法能有效除去铬鞣废液中可溶性油脂、蛋白质及其他杂质,从而消除了铬鞣废液直接循环利用中杂质累计对皮革质量的影响.研究表明,处理后的铬鞣废液利用率可达到90%,且循环利用多次,成品革的性能稳定,从而可实现铬鞣废液的清洁化生产.     

Improvement of hydrothermal stability and chrome uptake of leather: Amino-terminated hyper-branched polymer as high exhausted tanning auxiliary

Carboxyl-terminated hyper-branched polyester is extensively used as high exhaustion chrome tanning auxiliary owing to its strong coordination ability with trivalent chrome. Owing to lower electronegativity of N than O, the coordination ability with trivalent chrome for hyper-branched polyamide is stronger than polyester. Herein, in this paper, an amino-terminated hyper-branched polyamide (HBPN) is synthesized and used as high exhaustion chrome in tanning of pickling pigskin (HBPN–Cr). The effects of utilization of HBPN in denaturation temperature, shrinkage temperature, chrome uptake, and microstructure structure of wet-blue leather are studied. Moreover, the anti-oxidation stability of wet-blue leather is preliminary studied by heat treatment. The results show that incorporation of 1% HBPN in pickling process can significantly improve chrome uptake to 83.32%. The hydrothermal stability of wet-blue leather is improved due to the formation of higher crosslinking degree of collagen fibers. In addition, for the wet-blue leather without unsaturated fatliquoring agent, through heat treatment, hexavalent chrome does not appear after 24 ​h heat treatment. On the contrary, the chrome complex changes from hydroxyl copolymerization to more stable oxygen copolymerization or chrome oxide for C–Cr and HBPN-Cr tanned leather, respectively. These results will build a data support for the further study of hyper-branched polymer chrome tanning auxiliaries.     

The effects of copper ions on the catalytical degradation of azo dye acid chrome blue K

The effects of Cu²⁺ on the catalytical degradation of acid chrome blue K (ACBK) in UV-TiO₂ and H₂O₂ processes were studied. In these two processes, Cu²⁺ markedly depressed the catalytical degradation of ACBK by its interaction with ACBK. Through this interaction, the new complex Cu(ACBK)₂ formed. The formation of this new complex was favorable to protect some groups in ACBK from the oxidation of reactive oxygen generated in UV-TiO₂ and H₂O₂ processes, and consequently had suppressing effects on degradation of ACBK. In addition, Cu²⁺ also inhibited the degradation of ACBK in UV-TiO₂ process by influencing the adsorption of ACBK on the surface of TiO₂ particles.