LDH型MoO_4~(2-)缓蚀剂的合成及防腐性能

采用共沉淀法制备了镁铝氢氧化物为层板、MoO24-柱撑的LDH型MoO24-缓蚀剂(记为MoO24-LDH),利用XRD和Raman光谱对样品进行表征。通过缓释实验,讨论了LDH型缓蚀剂的释放能力以及缓蚀剂的缓蚀机理。SEM-EDS、ICP、N2吸附脱附和极化曲线测试结果表明,合成的LDH型MoO24-缓蚀剂具有很好的离子交换和吸附Cl-的性能,释放出MoO24-缓蚀剂进入电解液,24 h内对镁合金的腐蚀电流保持在9.129μA/cm2,减缓了镁合金腐蚀。添加质量分数20%MoO24-LDH颜料的环氧涂层在质量分数3.5%NaCl溶液中的EIS测试体现出较好的耐蚀作用,耐盐雾腐蚀187 h以上。     

油溶性缓蚀剂及其缓蚀机理研究

使用缓蚀剂是金属防护的一种重要手段,通过金属材料的腐蚀原因与防腐蚀方法,引出了油溶性缓蚀剂并简要介绍了其发展历程,综述了油溶性缓蚀剂的分类与应用,结合具体实例重点描述了其缓释机理,同时还对未来缓蚀剂的发展做出了展望。     

咪唑啉型油田缓蚀剂的合成与应用研究

综述了咪唑啉型油田缓蚀剂的研究进展,讨讨了其缓蚀机理,介绍和分析了缓蚀剂在石油开采中的应用现状和发展前景。     

咪唑啉型缓蚀剂合成方法的研究现状

简要概述了咪唑啉型缓蚀剂的基本结构及其缓蚀机理 ,并对咪唑啉型缓蚀剂的结构对该类缓蚀剂的缓蚀性能的影响进行了初步的概括 ,主要介绍了国内关于咪唑啉型缓蚀剂常见的几种合成方法以及其定性分析方法 ,系统的阐述了各种反应条件诸如温度、压力等对咪唑啉系列缓蚀剂的合成反应的影响。同时 ,也对国内咪唑啉类系列化合物合成的研究现状进行了简要的概括和总结     

LS型阻垢缓蚀剂的合成

介绍LS型阻垢缓蚀剂的研制方法,并对阻垢缓蚀剂性能进行了对比测试,从而得出LS型阻垢缓蚀剂是一种优异的环保型水处理剂。     

颜料锌粉的缓蚀剂研究

考察了5种缓蚀剂对锌粉在酸性条件下的缓蚀效果,研究了缓蚀剂与锌粉的质量比对缓蚀剂缓蚀效果的影响,考察了葡萄糖(GL)与抗坏血酸(VC)复配使用的效果,并用析氢实验、光学显微镜、红外吸收光谱对样品进行了分析和表征。结果表明,葡萄糖、抗坏血酸在酸性溶液中具有良好的缓蚀效果,缓蚀效率分别能达到52.7%和60.3%;葡萄糖在m(GL)/m(Zn)=100%,抗坏血酸在m(VC)/m(Zn)=50%时缓蚀效果最为理想;复配后的缓蚀剂在m(VC)∶m(GL)∶m(Zn)=3∶1∶20时缓蚀效果最好,缓蚀效率可达91.7%。     

装载锌/钼酸盐缓蚀剂的水滑石纳米容器的防腐性能

以水滑石作为储存缓蚀剂Zn2+、MoO42-的纳米容器,制备了MoO42-柱撑Zn/Al纳米水滑石(Zn/Al-MoO42-)。利用X射线衍射仪(XRD)、透射电子显微镜(TEM)、等离子体电感耦合光谱仪(ICP)和N2吸附脱附等温线对样品进行表征,采用动电位极化曲线(LP)和电化学阻抗谱(EIS)测试该纳米容器对AZ31镁合金的腐蚀防护效果。结果表明,所合成的Zn/Al-MoO42-水滑石纳米容器具有完整的层状结构,结晶良好,粒径尺寸在80nm左右,层板间距0.762nm,最可几孔径为38nm,为介孔材料,而且它可根据Cl的浓度差异发生不同程度的离子交换,具有良好的离子交换性能。将其作为颜料添加到环氧树脂中,并于镁合金表面固化成膜,所得的环氧涂层体系在质量分数为3.5%的NaCl溶液中浸泡70d后,仍具有较好的耐腐蚀性能。     

新型席夫碱缓蚀剂的合成及性能研究

以苯甲醛、A胺为原料合成一种席夫碱酸化缓蚀剂,通过正交试验优化得出最佳合成条件如下:n(胺):n(醛)=0.8,反应时间8h,反应温度60℃,催化剂加量为0.5%。用失重法评价了席夫碱在盐酸溶液中的缓蚀性能。在15%盐酸中,当缓蚀剂加量为1.0%时,N80钢片的腐蚀速率为0.9534 g·(m2·h)-1,低于SY/T 5405-1996《酸化用缓蚀剂性能试验方法及评价指标》中的一级标准。     

季铵盐型缓蚀剂的合成及性能评价

由喹啉、氯丙烯、环氧氯丙烷、氯化苄为原料,合成了烯丙基氯化喹啉、环氧丙烷基氯化喹啉和苄基氯化喹啉,比较了3种缓蚀剂的缓蚀效果,并将3种季铵盐与丙炔醇和曼尼希碱进行了复配。室内评价结果表明,苄基氯化喹啉的缓蚀效果最好。120℃时将苄基氯化喹啉、曼尼希碱和丙炔醇以一定比例复配,所形成的配方可以达到标准中的一级标准。     

Advances in layered double hydroxide (LDH)-based elastomer composites

This article reviews the advances in layered double hydroxide (LDH) materials and the synthesis of LDH-based elastomer composites. The potential of tuning the structure of LDH materials for desired properties and applications has attracted both academic and industrial interest in recent years. The modification of LDH materials and the use of such materials in the synthesis of composites with different elastomer matrices have been critically analyzed. Emphasis has been given to the use of Mg-Al LDHs and Zn-Al LDHs with different elastomers. The use of modified LDHs with elastomers substantially improves their mechanical, thermal and optical properties. Even “smart properties” of elastomers, such as reversible thermotropic optical characteristics, have been realized with the use of LDH-based multifunctional additives in rubber formulations. The flame retardance of some elastomer composites has also been enhanced with the use of modified LDHs. The possibility of replacing ZnO with LDH during rubber compounding has also been discussed, which would lead to drastic interventions in the well-established rubber processing technologies. LDH materials have also been reported to be biocompatible. Therefore, among the various possible applications of LDHs in different material development processes, their use in rubber technology offers the potential for environmentally friendly rubber products, even tires. Throughout this article, the structure, synthesis, properties and applications of elastomer/(LDH) composites are discussed, including suitable examples taken from the relevant literature.     

Preparation of new layered double hydroxide,Zn-Mo LDH

Layered double hydroxide (LDH) is prepared conventionally with bivalent and trivalent cations. We recently reported that the preparation of Zn-Ti LDH consisting of bi and tetravalent cations is possible through the decomposition of urea. In this study, Zn-Mo LDH consisting of bi and hexavalent cations were prepared and reacted with organic monocarboxylic and dicarboxylic acids. Interlayer spacing of the prepared LDH (Zn-Mo-CO₃) contained carbonate anions between the layers was 0.72 nm. The spacing was small compared to usual LDH (Zn-Al-CO₃) of 0.76 nm in the case of carbonate anion as the guest. Also, TG analysis indicated that the electrostatic force between the Zn-Mo layers and carbonate anions was larger than those of Zn-Al LDH. Certainly, the carbonate anions in Zn-Mo LDH decomposed at 260°C while they in usual LDH decomposed at 230–240°C. ESCA showed that Mo⁵⁺ had changed to Mo⁶⁺ through the preparation procedure. These results showed the preparation of layered double hydroxides consisting of bivalent and hexavalent cations. By the intercalation of Zn-Mo LDH with suberic acid at 60°C, a sharp peak was observed at 1.06 nm and the peak of LDH itself (0.72 nm) disappeared. This result has suggested that the intercalation of organic acid into new LDH was performed completely.     

Anticorrosion organic coating with layered double hydroxide loaded with corrosion inhibitor of tungstate

Mg–Al layered double hydroxides, loaded with tungstate anions, were synthesized via the co-precipitation method. The obtained compounds were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), inductively coupled plasma (ICP), and transmission electron microscopy (TEM), respectively. The ICP results demonstrated the partial anion-exchange process, involving the release of tungstate anions from layered double hydroxide by the chloride anions. Polarization measurements showed that the filtrate as electrolyte possessed a low corrosion current density value of 3.042 μA/cm². The electrochemical impedance spectroscopy (EIS) exhibited that the coating could effectively protect the alloy from corrosion. The function of the layered double hydroxide loaded with tungstate doped in organic coating was also discussed.     

Quaternized polysulfone‐based nanocomposite membranes and improved properties by intercalated layered double hydroxide

Two anions (dodecylbenzenesulfonate anion and stearate anion) are employed to synthesize intercalated layered double hydroxides (LDH) by co‐precipitation method. Then the intercalated LDHs are incorporated in the casting solutions of chloromethylated polysulfone (CMPSF) for fabricating quaternized polysulfone/LDH nanocomposite membranes. Fourier transform infrared, X‐ray diffraction, thermogravimetric analysis, scanning electron microscopy, and mastersizer laser particle size analysis are used to characterize the structure and morphology of LDHs and membranes. The properties of the composite membranes including water uptake, mechanical property, thermal stability, and ionic conductivity are investigated. Compared with other anion exchange membranes, both nanocomposite membranes containing 5% LDH sheets displayed better balanced performance. They exhibit the ionic conductivity of 3.58 × 10^?2 S cm^?1 and 3.86 × 10^?2 S cm^?1 at 60°C, respectively. POLYM. ENG. SCI., 2017. © 2017 Society of Plastics Engineers     

二维层状双金属氢氧化物在去除磷酸盐中的应用

层状双金属氢氧化物（LDH）是磷酸盐去除的良好吸附剂,具有表面易改性、电荷可调、层间距可控、吸附能力强和吸附速度快的特点,能够有效解决水体富营养化问题。本文从LDH除磷性能的优化出发,综述了LDH的结构特征、除磷机理、制备方法、剥离方法的前沿理论和应用案例;基于目前LDH用作磷酸盐吸附剂面临着易团聚、胶体溶液不稳定、性能受控于pH以及难回收等问题,分析了磁性LDH、生物炭/LDH、GO(rGO)/LDH等复合材料的复合方法和性能改进方案,指出了LDH复合改性和LDH膜材料的研究新趋势,以及主要研究重点与热点。希望本文能够为LDH在水处理领域的研究提供新思路,为深入优化LDH吸附和膜分离性能提供理论支持和方向引导。     

Morphology and properties of stearate‐intercalated layered double hydroxide nanoplatelet‐reinforced thermoplastic polyurethane

In the past few years, layered double hydroxides (LDHs) with monolayer structure have been much studied for the development of polymer nanocomposites. LDHs with intercalated stearate anions form a bilayer structure with increased interlayer spacing and are expected to be better nanofillers in polymers. In the work reported, thermoplastic polyurethane (PU)/stearate‐intercalated LDH nanocomposites were prepared by solution intercalation and characterized. X‐ray diffraction and transmission electron microscopy confirmed the exfoliation at lower filler loading followed by intercalation at higher filler loading in PU matrix. As regards mechanical properties, these nanocomposites showed maximum improvements in tensile strength (45%) and elongation at break (53%) at 1 and 3 wt% loadings. Maximum improvements in storage and loss moduli (20%) with a shift of glass transition temperature (15 °C) and an increase in thermal stability (32 °C) at 50% weight loss were observed at 8 wt% loading in PU. Differential scanning calorimetry showed a shift of melting temperature of the soft segment in the nanocomposites compared to neat PU, possibly due to the nucleating effect of stearate‐intercalated LDH on the crystal structure of PU. All these findings are promising for the development of mechanically improved, thermally stable novel PU nanocomposites. Copyright © 2011 Society of Chemical Industry     

复合型钼酸盐缓蚀剂性能研究

由Na3PO4、ZnSO4、钼酸钠、BTA等配制软化水缓蚀剂,通过挂片实验,考察了缓蚀剂成分用量对缓蚀性能的影响。结果表明,当Na3PO4含量为6²0 mg,ZnSO4含量为520 mg,ZnSO4含量为5³0 mg,钼酸钠含量为1.2530 mg,钼酸钠含量为1.25¹0 mg,BTA含量为010 mg,BTA含量为0⁵ mg时,缓蚀剂的缓蚀率均≥92%。