淀粉接枝丙烯酰胺/沸石高吸水性复合材料的研究

采用N,N-亚甲基双丙烯酰胺为交联剂,以过硫酸钾为引发剂,利用水溶液聚合法制备了淀粉接枝丙烯酰胺/沸石高吸水性复合材料,研究了淀粉与单体的配比、沸石添加量、交联剂用量、引发剂用量及中和度对吸水倍率的影响,探讨了复合材料的保水性,用红外光谱表征复合材料的结构。结果表明:沸石在聚合物中能较好分散,复合材料吸自来水倍率达365g/g,对生理盐水溶液的吸水倍率达67g/g,其保水性能良好。     

多元新型高吸水性复合材料的制备及性能研究

在室温下制备出互穿网络的多元复合新型高吸水性复合材料,不仅降低了其生产成本,而且有利于大规模生产。通过水溶液氧化还原常温聚合体系,以丙烯酸和丙烯酰胺为单体,添加硅藻土,同时加入聚乙烯醇为交联改性剂,在室温下制取了硅藻土高吸水性复合材料。通过正交实验得到的复合材料其吸蒸馏水倍率达1 423 g/g,吸0.9%盐水的倍率达106g/g,并以最优组合为基础,通过单因素实验着重研究了引发剂、交联剂、中和度等对吸水倍率的影响,结果表明当引发剂的用量为0.30%~0.40%,交联剂的添加量为0.04%~0.06%,中和度为75%时,复合材料的吸水性能最好。     

杭锦土/P(AA-AM)复合高吸水树脂合成实验研究

以N,N’-亚甲基双丙烯酰胺(NMBA)为交联剂,过硫酸钾/亚硫酸钠为引发剂,丙烯酸(AA)和丙烯酰胺(AM)为单体,采用微波法合成杭锦土聚合丙烯酸钠-丙烯酰胺复合高吸水树脂。研究结果表明,当杭锦土添加量为50%,AM∶AA比例为25%,交联剂用量为0.05%,引发剂用量为8%,NaOH中和度为85%时,该复合材料具有最大吸水倍率,其吸蒸馏水和自来水倍率分别为628.88g/g和121.92g/g。     

聚(丙烯酸-co-丙烯酰胺)/蛭石高吸水保水复合材料的合成与性能研究

以膨胀蛭石(EVMT)、丙烯酸(AA)、丙烯酰胺(AM)为原料,通过水溶液聚合法制得了聚(丙烯酸-co-丙烯酰胺)/蛭石高吸水保水复合材料.研究了蛭石的添加量、丙烯酰胺用量、中和度、引发剂用量以及交联剂用量等对吸水率的影响.得到的最佳反应条件为:中和度为70%.丙烯酰胺、蛭石、引发荆和交联剂量分别为丙烯酸单体质量20%、12%、0.8%和0.12%.结果表明,蛭石加入量为12%时,复合材料的吸水和保水性能明显得到增强.     

沸石-纤维素系超强吸水剂的合成及性能研究

以丙烯酸、沸石、纤维素等为原料,用水溶液交联共聚法合成了超强吸水树脂。研究了纤维素与单体的配比、交联剂用量、沸石添加量及中和度对吸水倍率的影响,探讨了复合材料的保水性,用红外光谱表征复合材料的结构。结果表明:沸石在聚合物中能较好分散,复合材料吸水倍率达547.3g/g,对生理盐水溶液的吸水倍率达91.4g/g。其保水性能良好。     

微波辅助沸石-淀粉系高吸水复合材料的制备及性能

利用微波辅助合成了沸石-淀粉系高吸水复合材料,采用红外光谱表征了复合材料的微观特征,研究了淀粉与单体的配比、交联剂用量、引发剂用量、沸石添加量及中和度对吸水倍率的影响,探讨了复合材料的保水性。结果表明:沸石在聚合物中能较好分散,当沸石质量分数为10%、淀粉为5%、引发剂为0.4%、交联剂为0.04%、中和度为70%时,复合材料吸自来水倍率达459g/g,对生理盐水溶液的吸水倍率达85 g/g。其保水性能良好。     

膨润土/聚丙烯酰胺吸水性复合材料的研究进展

本文简述了高吸水性树脂以及无机/聚合物高吸水性复合材料的研究现状,着重介绍了膨润土/聚丙烯酰胺复合材料制备的主要方法和制备工艺条件对材料性能的影响,探讨了其吸水膨胀机理.在此基础上,展望了膨润土/聚丙烯酰胺复合材料的应用前景.     

新型交联聚丙烯酰胺/膨润土复合防水材料的研究

使用过氧化物-叔胺氧化还原引发剂体系在室温条件下快速合成交联聚丙烯酰胺/膨润土复合材料。该复合材料中膨润土的含量可达到70%, 其吸水膨胀速度快, 浸水24 h后, 吸水体积膨胀率可达到其最大吸水体积膨胀率的80%以上, 吸水体积膨胀率较高, 吸水膨胀后不开裂, 不分散, 可以被用做吸水膨胀类型防水材料。影响其吸水体积膨胀率的主要因素是膨润土的含量。使用X射线衍射(XRD)、红外(FTIR)和热重(TG)对复合材料的结构进行了表征和分析, 结果表明, 膨润土在聚合过程中除了层间距有所增大外, 基本结构不变, 而且分散度提高; 吸水性复合材料的热稳定性提高。     

聚(丙烯酸-co-丙烯酰胺)/硅藻土高吸水性复合材料的制备及性能研究

采用N,N’-亚甲基双丙烯酰胺作交联剂,过硫酸铵作引发剂,通过水溶液聚合法制得了聚(丙烯酸-co-丙烯酰胺)/硅藻土高吸水性复合材料.考察了硅藻土的添加量、丙烯酰胺用量、中和度、引发剂用量以及交联剂用量等对吸水率的影响.得到的最佳反应条件为:中和度为70%,丙烯酰胺、硅藻土、引发剂和交联剂量分别为丙烯酸单体质量20%、...     

白蟮泥/（丙烯酸-丙烯酰胺）高吸水保水材料的制备及性能研究

采用水溶液聚合法制备高吸水保水材料,用正交实验法分析了交联剂、引发剂、白蟮泥添加量、丙烯酰胺(AM)添加量、中和度等因素对高吸水保水材料的影响;测试高吸水保水材料的吸水速度和保水能力;同时利用红外光谱分析高吸水保水材料的官能团.实验结果表明:①吸蒸馏水的最佳制备工艺条件:交联剂0.01%、引发剂0.40%、中和度75%、丙烯酰胺16.7%、白蟮泥15%;影响因素的程度依次为:交联剂>白蟮泥>引发剂>丙烯酰胺>中和度;②吸自来水的最佳制备工艺条件为:交联剂0.01%、引发剂0.50%、中和度75%、丙烯酰胺20%、白蟮泥20%;影响因素的程度依次为:交联剂>中和度>丙烯酰胺>引发剂>白蟮泥;③吸盐水的最佳制备工艺条件为:交联剂0.01%、引发剂0.40%、中和度75%、丙烯酰胺20%、白蟮泥8%,影响因素的程度依次为:交联剂>中和度>引发剂>丙烯酰胺>白蟮泥.     

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.     

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     

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