超细滑石粉在水介质中的分散机理研究

研究了超细滑石粉在水介质中的分散行为 ,讨论了超分散剂 PSE系列与传统分散剂对滑石在水介质中的分散行为的影响 ,并通过颗粒间的相互作用能的计算进一步分析了超分散剂PSE系列的作用机理。研究结果表明 :当滑石颗粒表面电位达到 5 0 m V时 ,滑石仍处于明显的团聚状态 ,说明滑石颗粒表面具有的疏水作用能是决定其在水介质中基本分散行为的重要因素 ;A- B嵌段超分散剂 PSE系列对超细滑石粉颗粒的分散效果优于传统的分散剂 ,且不受介质 p H的影响 ,其分散稳定作用实质上是增强了颗粒间的静电排斥作用和空间位阻作用 ,减弱了范德华吸引作用的结果     

纳米奠来石在水介质中的分散稳定性

以六偏磷酸钠作为分散剂，利用沉降实验研究了分散剂用量，pH值及超声处理时间对纳米莫来石在水介质中的分散稳定性的影响。结果表明：pH〉7、超声时间为10min（功率140W）、六偏磷酸钠的浓度为0．5％（wt）时，可以获得较稳定的分散。分散后纳米粒子团聚现象减小，粒子平均粒径从5μm减小为300nm，对纳米莫来石在水基涂料等方面的应用进行了初步探索。     

纳米粉体分散技术发展概况

就纳米粉体团聚体形成的原因，纳米粉体的物理、化学分散技术进行了阐述，指出合成性能优异的分散剂、设计高教分散机械、提高分散粒子的稳定性及有效分散体积和能量利用率，最终提高分散效果，乃是纳米粒子分散技术的发展方向。     

矿物粒子／聚合物复合材料的研究进展——界面结构、增韧机理与协同效应

矿物粒子/聚合物复合材料的性能很大程度上决定于二者所形成界面结构,矿物粒子的组合可进一步调节和优化材料加工工艺、改善材料的综合性能。综述了近年来国内外有关矿物粒子在聚合物中的分散特征、矿物粒子/聚合物复合材料的界面相结构以及粒子增强韧机理方面的基础研究,总结了矿物粒子的组合使用与材料性能的密切关系,并介绍了典型矿物粒子/聚合物复合材料应用的最新进展。     

细粒浮选体系中界面极性引互作用理论及应用

本文系统讨论了界面极性相互作用理论及其在细粒浮选研究中的应用。亲水矿粒间水化排扩作用及疏水矿粒间疏水吸引作用主要归因于颗粒间界面极性相互作用，通过测定矿物在已知表面能参数的液体中的接触角，就可确定矿物的表面能参数值，由界面极性相互作用能确定水化或疏水相互作用能量常数，从而计算颗粒间水化或疏水相互作用能曲线，利用ＥＤＬＶＯ理论能很好解释矿粒间的凝聚、分散行为。     

纳米莫来石在水介质中的分散稳定性

以六偏磷酸钠作为分散剂,利用沉降实验研究了分散剂用量,pH值及超声处理时间对纳米莫来石在水介质中的分散稳定性的影响.结果表明:pH>7、超声时间为10min(功率140w)、六偏磷酸钠的浓度为0.5%(wt)时,可以获得较稳定的分散.分散后纳米粒子团聚现象减小,粒子平均粒径从5μm减小为300nm,对纳米莫来石在水基涂料等方面的应用进行了初步探索.     

纳米铜粉在太阳能集热器循环工质中的分散

以阿拉伯树胶和六偏磷酸钠为分散剂,以乙二醇水溶液为分散介质,采用球磨分散法制备用作太阳能集热器循环工质的铜纳米流体.通过分光光度法和沉降法研究分散剂含量和球磨时间等因素对铜纳米流体稳定性的影响.结果表明,阿拉伯树胶和六偏磷酸钠均能有效的分散铜纳米颗粒,得到均匀、稳定的铜纳米流体.当用阿拉伯树胶作分散剂时,质量分数为0.25%、球磨时间为6h时,分散效果最佳.用六偏磷酸钠作分散剂,质量分数为0.1%、球磨时间为2h时,分散效果最佳.阿拉伯树胶对铜纳米颗粒的稳定分散作用主要是通过空间位阻机制来实现的,而六偏磷酸钠对铜纳米颗粒的稳定分散作用则主要是通过静电稳定机制来实现的.     

消光PA 66生产用TiO_2水悬浮液分散稳定性的研究

采用悬浮沉降的方法研究了不同的分散剂添加量、不同的固体浓度、不同的温度下,TiO2颗粒在水中的分散稳定性,利用静电稳定机制和空间稳定机制解释了各种因素对TiO2水悬浮体系分散稳定性的影响。     

纳米金刚石团聚体在白油介质中的解聚与分散

采用机械化学方法, 对爆轰法合成的纳米金刚石团聚体进行表面改性, 实现了纳米金刚石在白油体系中的解团聚和稳定分散。采用红外光谱等分析, 对几种聚合物分散剂在纳米金刚石表面的吸附机理进行了研究。利用适当用量的聚合物分散剂进行机械化学改性, 可以得到良好分散的体系。在白油体系中, 分散剂吸附产生的空间位阻作用是纳米金刚石分散稳定的主要机制。     

分散剂对煅烧高岭土和钛白粉分散性的影响

无机填料在水中的分散是水性涂料行业重点研究方向，添加分散剂是实现填料稳定分散的有效方法。本研究对涂料行业中两种常用填料——煅烧高岭土和钛白粉进行X射线衍射（XRD）、扫描电镜（SEM）及傅里叶红外光谱（FTIR）分析，考察六偏磷酸钠（SHMP）、聚丙烯酸钠（NaPAA）和十二烷基硫酸钠（SDS）3种分散剂对这两种分散相在水中的分散效果，采用沉降试验及zeta电位测定探究分散机理。结果表明，SHMP作为分散剂时，煅烧高岭土zeta电位绝对值达到48 mV，钛白粉zeta电位绝对值达到55 mV，在该分散剂作用下粒子表面静电斥力增强，使得分散体系稳定性得到提高；使用SHMP时分散效果显著，在沉降16 h后依然保持着良好的分散性，分散稳定性最优。     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered