PP/白云石凹凸棒土复合材料的制备与性能研究

采用硅烷偶联剂（SG-Si900）对白云石凹土进行有机表面改性,通过IR和TG-DTG对改性前后的凹土进行了表征。将经过表面处理的凹凸棒土与PP复合制备聚丙烯/凹凸棒土复合材料。力学性能实验表明,在凹凸棒土填充量达到2%时,复合材料的冲击和拉伸强度达到最大。     

熔融复合法制备聚乳酸/凹凸棒土纳米复合材料

对凹凸棒土(AT)进行有机改性后,采用熔融复合法制备了AT的质量分数为1wt%、3wt%、5w%的聚乳酸/凹凸棒土纳米复合材料(PLA/OAT-x),对复合材料进行红外、SEM、DSC等表征.SEM结果表明,凹凸棒土粒子在复合材料中实现了均匀稳定分散,通过对复合材料的综合热性能分析和力学性能分析,PLA/OAT-3复合材料的拉伸强度、杨氏模量比纯PLA分别增加78.8%和119.3%.同时.复合材料的溶液降解性能也明显加快.     

活性凹凸棒土/PVFM纳米复合材料的制备与性能研究

凹凸棒原土经提纯粉碎后,用硅烷偶联剂KH560进行表面改性,获得活性凹凸棒土纳米棒晶。用高速搅拌和超声波振荡的方法使活性纳米凹凸棒土均匀分散在聚乙烯醇缩甲醛(PVFM)泡沫海绵的基体中,制得活性凹凸棒土/聚乙烯醇缩甲醛纳米复合材料。用SEM观察了纳米凹凸棒土和复合材料的微观结构。通过物理力学性能测试表明:当活性纳米凹凸棒土填充量为6g/100g时,可以显著提高聚乙烯醇缩甲醛泡沫海绵的拉伸强度(2.68MPa)和吸水率(14.92g/g),降低材料的表观密度(76.8kg/m3)。     

蒙脱土的有机化改性及其在NR/SBR胶乳中的研究

利用红外光谱法（IR）、X射线衍射（XRD）对有机化蒙脱土（OMMT）进行了分析。采用乳液插层法制备了OMMT/天然胶乳（NR）/丁苯胶乳（SBR）的复合材料,研究了复合材料的拉伸性能、硬度,并用XRD对复合材料的结构进行了表征。结果表明：与MMT相比,OMMT的层间距增大。随OMMT量增加,复合材料的拉伸性能、硬度逐渐增加。当OMMT含量为8%时,能获得拉伸强度、断裂伸长率较优的复合材料。利用XRD分析表明,形成了OMMT/NR/SBR插层型纳米复合材料。     

氧化石墨烯/蒙脱土/天然橡胶复合材料的性能研究

以蒙脱土(MMT)为填料,氧化石墨烯作为分散剂,制备了氧化石墨烯/蒙脱土复合粉体(MC),将其填充到天然橡胶(NR)中,得到橡胶复合材料。考察了混炼胶的硫化性能,分析了硫化胶的机械性能。结果表明,MMT和MC都可以增加混炼胶的硫化速度,硫化胶的拉伸强度、耐磨、耐溶剂和交联密度等性能均得到了较大提高。比较MMT和MC两种填料,发现MC对天然橡胶性能的补强效果明显高于MMT。其中添加量为5 g的MC5/NR复合材料的性能最佳,拉伸强度达到19.9 MPa,磨耗体积为0.60 cm3,交联密度为0.288 mol/L。     

硅土/炭黑复合填料对天然橡胶性能的影响

对硅土进行活化和改性处理,通过测定吸油值、吸碘值进行表征。将经改性处理的硅土与炭黑复合用于填充天然橡胶,进行物理机械性能测试。结果表明：硅土与炭黑并用,与单独填充炭黑相比,对橡胶的加工性能影响不明显。拉伸性能测试结果表明,复合填料与单独填充炭黑相比,能提高NR硫化胶拉伸强度,扯断伸长率提高。当硅土与炭黑质量比为2∶5时,NR硫化胶的拉伸强度达到最大。硅土和炭黑并用能增强天然橡胶的综合性能,降低成本。     

改性重晶石补强天然橡胶的研究

利用硬脂酸对重晶石进行有机活化改性,通过直接共混法制备重晶石/天然橡胶(NR)复合材料。研究复合材料的拉伸性能、硬度、耐磨性能变化规律。结果表明:重晶石对NR有明显的补强作用。当活化重晶石含量为30%时,能获得拉伸强度、断裂伸长率及耐磨性能优异的复合材料。     

凹凸棒土的表面处理及在硅橡胶中的应用研究

以纳米凹凸棒土(AT)为补强剂,采用机械共混法对甲基乙烯基硅橡胶(MVQ)进行填充,制备了具有优异力学性能和高耐热性能的纳米AT/MVQ复合材料.具体考察了填料纳米AT和硅烷偶联剂的用量、改性方式等对材料的影响,同时通过热分析(TG、DTA)研究其耐热性能.结果表明,AT对MVQ具有较好的补强性能,且经湿法改性后有利于改善复合材料的性能,提高材料的耐热性能.力学性能测试表明,填料用量为10phr时,采用湿法改性AT填充所得复合材料的拉伸强度增加了19.5%.热分析表明,相比于生胶,填充改性AT的复合材料的初始分解温度提高了41.1℃.流变性能测试结果表明,通过改性可以增强AT与MVQ分子之间的界面结合力,降低了"Payne效应".     

蒙脱土的有机化改性及其栅SBR胶乳中的研究

利用红外光谱法(IR)、X射线衍射(XRD)对有机化蒙脱土(OMMT)进行了分析.采用乳液插层法制备了OMMT/天然胶乳(NR)/丁苯胶乳(SBR)的复合材料,研究了复合材料的拉伸性能、硬度.并用XRD对复合材料的结构进行了表征.结果表明:与MMT相比,OMMT的层间距增大.随OMMT量增加,复合材料的拉伸性能、硬度逐渐增加.当OMMT含量为8%时,能获得拉伸强度、断裂伸长率较优的复合材料.利用XRD分析表明,形成了OMMT/NR/SBR插层型纳米复合材料.     

熔融复合法制备邻甲酚醛环氧树脂/凹凸棒土纳米复合材料

通过对凹凸棒土(AT)进行有机改性,得到有机化凹凸棒土(OAT),并对其进行FTIR和XRD表征,结果表明,表面活性剂是以物理吸附形式存在于凹凸棒土棒晶的外表面上.采用熔融复合法制备了AT质量分数为1%～5%的邻甲酚醛环氧树脂/凹凸棒土纳米复合材料(ECN/OAT-x),并对复合材料进行SEM、DMA和TGA等表征.S...     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。