Synthesis and Efficiency of an Epoxy-Urea Chelating Resin for Preconcentrating and Separating Trace Bi,In, Sn,Zr, V And Ti From Solution Samples

Abstract

A new epoxy-urea chelating resin was synthesized from epoxy resin and used for the preconcentration and separation of trace Bi(III), In(III), Sn(IV), Zr(IV), V(V) and Ti(IV) ions from solution samples. The analyzed ions can be enriched at pH 5 at a flow rate of 1–4 ml/min, and can be also desorbed with 10 mL of 2 M HCl +0.1g NH₄F solution from the resin column, with recoveries over 97%. The chelating resin reused 6 times can still adsorb quantitatively the Bi, In, Sn, Zr, V and Ti ions, and eighty to thousand-fold excesses of Ca(II), Mg(II), Cu(II), Zn(II), Al(III), Sb(III), Ni(II), Mn(II) and Fe(III) cause little interference with the enrichment and determination of these ions. The RSDs of the proposed method for the determination of 500–50 ng/ml Bi, In and Sn, 50–5.0 ng/ml Zr, V and Ti were in the range of 0.4 ～ 4.0%, the enrichment factor of the resin for the ions is in the range of 10–100. The recoveries of added standard in waste water are between 96% and 100%, and the concentration of each ion in alloy steel sample determined by the method is in good agreement with the reference value analyzed by a steel plant with average error <2.8%.     

流动注射树脂相光度法联用单片机测定铜

基于铜（Ⅱ）与2-[（5-溴-2-吡啶）偶氮]-5-（二乙胺基）苯酚（5-Br-PADAP)形成稳定络合物的性质,利用717型阴离子交换树脂作为吸附载体,建立了流动注射树脂相吸光光度法测定铜的新方法,并联用单征机实现测定过程的程序化、自动化。此法已成功用于铜尾矿中铜的测定。     

电子束固化树脂基复合材料进展

综述了电子束固化树脂基复合材料的树脂基体、电子束固化工艺的优越性、吵固化复合材料在国内外的发展状况以不固化复合材料中存在的一些待解决的问题。     

Effect of acetone on mechanical properties of epoxy used for surface treatment before adhesive bonding

A thin layer of un-cured resin over metal substrates applied by using an acetone-diluted resin solution (without hardener) has been found to be beneficial to strong adhesive bonding. The resin pre-coating (RPC) solution can effectively seal sub-surface micro-cavities and increase the substrate wettability. This study examines possible aftermath effects of the acetone dilution on mechanical properties of epoxy through comparison of samples made from as-received resin and resins diluted once and twice by acetone. RPC can be accepted with confidence in substrate pre-treatments for strong adhesive bonding if no detrimental effect on epoxy properties is observed. Fourier transform infrared spectrum (FTIR) was conducted, showing the spectrogram of the resin previously diluted by acetone was the same as that of as-received resin, i.e. no change in epoxy molecular structures after complete evaporation of acetone. Strength and modulus of elasticity measured by flexural and compressive tests were compared using samples made from as-received resin, and resins diluted once and twice by acetone. Variations among results from the three groups were less than 2%, or negligible, affirming the RPC method can be used for substrate pre-treatments and stronger adhesive bonding.     

盐酸介质中TBP萃取树脂吸附金的研究

实验研究了TBP萃取树脂从盐酸介质中吸附金的行为，测定并讨论了溶液酸度、TBP含量和温度等因素对吸附的影响，确定了平衡方程式。对固定床吸附过程的破点时间进行了实验研究和分析，提出了估算的方法。     

双酚A型环氧树脂多孔微球

双酚Ａ型环氧树脂多孔微球杨振忠许元泽俞浩赵得禄（中国科学院化学研究所高分子物理开放实验室北京１０００８０）关键词多孔微球，双酚Ａ环氧树脂，相反转技术微米级高分子多孔微球在生物医学、电子、印刷、信息业等方面具有重要作用．然而，通常的乳液聚合，悬浮聚合...     

Monoacylation of unprotected symmetrical diamines with resin-bound benzoic acids

A protocol for monoacylation of unprotected symmetrical diamines with a resin-bound benzoic acid is described. The nature of the resin (gel-based polystyrene vs highly crosslinked macroporous polystyrene) was found to play a minor role in acylation selectivity. Rather, the concentration of the diamine dictates the ratio of mono- and diacylated products. Thus, by employing a high concentration of symmetrical diamine (e.g., 1 M, 20 equiv), monoacylation can be selectively achieved for a variety of unprotected symmetrical alkyl and aryl diamines.     

利用原子吸收技术(FAAS)对聚苯胺酚树脂除铁性能进行评价

采用铁的次灵敏线，利用火焰原子吸收分光光度法对聚苯胺酚树脂的除铁性能进行测试，其对高含量铁的测试结果与化学滴定法比较相一致，但操作简便、快速。     

吸附树脂对紫背天葵的水溶性色素精制研究

研究吸附树脂吸附精制紫背天葵红色素的方法和工艺。以吸附量、解吸量为指标,在pH=7时吸附,确定出S-8极性树脂和盐酸-乙醇溶液为最佳吸附剂和解吸剂。正交动态吸附和解吸实验结果表明,当原花液浓度3g/L,吸附流速3ml/min,树脂床层径高比1:1时,树脂对色素的吸附量最大;以盐酸-乙醇为解吸剂,解吸液用量30ml/g,解吸流速是1/5BV。经树脂吸附精制后的色素色价是未精制色素的3.74倍。     

树脂酸性组分的氢氧化四甲铵甲基化与GC-MS分析

利用氢氧化四甲铵(TMAH)对马尾松树脂(塔罗油)进行甲基化，并对其产物进行GC—MS分析；研究表明TMAH甲基化后进行GC—MS分析是测定树脂中酸性组分的一种快速有效的方法，但酸性组分中的脂肪酸要比树脂酸难于甲基化，因此为了确保甲基化反应完全，应适当延长甲基化反应时间。