东南亚主要产胶国近期动态

1.柬埔寨首季度出口橡胶1.28万吨 据柬埔寨《金边晚报》4月23日报道,柬埔寨商业部的报告显示,2012年第一季度,柬埔寨橡胶出口量为1.28万吨,同比增长8%,而去年同期只有1.18万吨。但今年第一季度该国橡胶出口总额只有4100万美元,同比下降25%左右,主要原因是橡胶价格的降低。目前,国际市场橡胶价格为3895美元/吨,去年则是5654美元/吨。     

柬埔寨首季度橡胶出口量近5万吨

<正>柬埔寨农林渔业部橡胶总局的报告显示,2019年第一季度,柬埔寨共出口了4万8192吨橡胶,同比增长了9046吨,平均每吨的价格为1279美元,总收入达6100万美元。据报告称,柬埔寨橡胶总种植面积约43万6357公顷,其中可割胶面积约20万公顷。2018年,柬埔寨共出口了21万7500吨橡胶,同比增长15%,总收入近3亿美元。柬埔寨橡胶的主要出口国家分别为中国、越     

柬埔寨橡胶业收入达2.18亿美元

<正>柬埔寨农林渔业部橡胶总局日前发布的报告显示,今年1月份至10月份,柬埔寨共出口橡胶16.15万吨,同比增长23%。与此同时,国际橡胶价格同比下降19%,至每吨1355美元。1月份至10月份,橡胶总收入约2.18亿美元。柬埔寨全国橡胶种植面积达43.634万公顷,目前收割面积已近半。柬政府希望2020年橡胶出口量达到29万吨。     

今年柬埔寨橡胶出口有望增长12%

<正>据《越南通讯社》4月21日报道,柬埔寨农林渔业部预测,2015年该国的橡胶出口量将达11.2万吨,同比增长12%。2014年,柬埔寨的橡胶种植面积为35.8万公顷,橡胶出口量逾10万吨,较2013年增长16%,出口额达1.54亿美元。目前,柬埔寨对马来西亚、越南、中国、韩国和欧盟等出口橡胶。     

版块一:主要产胶国近期动态

<正>柬埔寨橡胶出口量猛增据越南通讯社8月18日报道,柬埔寨商务部的统计数据显示,2015年上半年,柬埔寨橡胶出口量为6.19万吨,同比(下同)增长47%。橡胶出口额为8420万美元,增长12%。目前,在国际市场上,质量最佳的橡胶价格为1533美元/吨,下降17%。马来西亚、越南、中国、韩国和欧盟等国家和地区是柬埔寨橡胶的出口市场。     

产胶国近期动态

正前11个月越南橡胶出口恢复增长据外媒报道,越南农业与农村发展部宣布前11个月橡胶出口额恢复增长。其中,11月份越南橡胶出口量达11.7万吨,出口额达1.65亿美元。前11个月出口量达110万吨,出口额达14.3亿美元。出口量和出口额分别同比增长12.3%和4.6%。柬埔寨胶农信心随胶价上涨而回升据外媒12月1日报道,柬埔寨橡胶园发展协会主席蒙金洪近期表示,尽管2017年橡胶价格预计会微降,但近两个月来,橡胶市场仍然保持良好状态,增强了     

柬埔寨上半年橡胶出口同比增17%至9.72万吨

正据柬埔寨农林渔业部的报告显示,目前柬埔寨橡胶种植面积达40.47万公顷,其中割胶面积达25.01万公顷。今年上半年,全国橡胶产量达9.79万吨,与2019年同期相比,增加1.53万吨,增长约18%。此外,今年上半年,柬埔寨橡胶向国际出口达9.72万吨,同比增长17%。     

越南对我国橡胶出口量大增

正据商务部消息,越南海关总局统计数据显示,2018年5月越南对我国橡胶出口量约为8万t,环比增长67.3%,同比增长160.3%;出口额约为1.14亿美元,环比增长71.4%。中国继续成为越南最大的橡胶出口市场。2018年前5个月,越南对我国橡胶出口量累计达27.55万t,同比增长24.9%;出口额达3.96亿美元,同比下降8.3%;出口均价达1 440美元·t~(-1),同比     

东南亚主要产胶国近期动态

1.越南1～10月橡胶出口量同比增长2.7%据越南农业和农村发展部公布的最新数据显示,越南今年1～10月橡胶出口量为60.8万吨,同比增长2.7%;出口额达26亿美元,同比增长57.3%。10月份越南橡胶出口量为8万吨,出口金额达3.4     

柬埔寨橡胶出口获利1.66亿美元

<正>据外媒消息,今年前8个月,柬埔寨橡胶出口总量达99057吨,实现出口交货值1.66亿美元,同比上涨34%。该国正计划将橡胶种植面积由43万公顷扩增至50万公顷。柬埔寨农林渔业部部长表示,今年前8个月橡胶市场较为良好,尽管胶价有所调整,但     

白炭黑粒径对天然橡胶/白炭黑湿法混炼胶性能的影响

通过使用球磨机在液相状态下对白炭黑进行研磨,可得到4种不同粒径白炭黑。采用湿法混炼工艺,将4种不同粒径的白炭黑与天然乳胶进行混合,制备出天然橡胶/白炭黑复合材料。对此种类型复合材料性能测定结果表明:用4种不同粒径的白炭黑制备的复合材料性能呈现出较大差异,当白炭黑粒径为9.4um,复合材料表现出最佳的综合性能。     

环保型白炭黑/CR/BR复合材料的制备工艺与性能研究

本论文研究了环保型白炭黑/CR/BR复合材料的加工工艺对其结构和性能的影响。通过改变环保型白炭黑的加料方式,采取了四种不同的加工工艺制备了环保型白炭黑/CR/BR复合材料,比较分析了四种复合材料的各种物理性能和SEM电镜照片,使用橡胶加工分析仪(RPA2000)对四种复合材料进行了深入的分析。研究表明：采用氯丁橡胶(CR)和顺丁橡胶(BR)分别与环保型白炭黑混炼制成母炼胶,再把两种母炼胶混炼的工艺,得到的复合材料性能最好,环保型白炭黑在基体材料中分散良好,形成了稳定的填料网络,拉伸强度达到19.3MPa ,撕裂强度为62.2 N/mm,回弹性可达42%。     

二氧化硅气凝胶硅源选择的研究进展

二氧化硅气凝胶以其独特的纳米孔结构展现出优异的性能,并在很多领域得到较好的应用。选择不同的硅源既有成本因素,又有性能要求,总的原则是优化气凝胶的结构和性能,拓展其应用领域。单一硅源主要有水玻璃和各种硅醇盐。复合硅源则可以引入疏水性和功能性基团,从而使二氧化硅气凝胶的结构性能得到改善,制备工艺过程更为优化。对二氧化硅气凝胶硅源选择的研究现状和前景做了系统探讨。     

阻燃纳米二氧化硅气凝胶的仿生制备进展

摘要l自然界中的稻秆是一种二氧化硅（SiO2）／纤维素的纳米复合材料,SiO2与纤维素在纳米尺度的复合,使稻秆质轻和刚柔并具。效仿天然植物复合材料的构筑原理,纳米纤维素模板法仿生制备轻质阻燃材料纳米二氧化硅气凝胶。综述了二氧化硅的仿生制备、二氧化硅气凝胶的制备,探讨了仿生制备的轻质阻燃材料纳米二氧化硅气凝胶的应用前景。     

偶联剂对白炭黑／SBR复合材料力学性能的影响

研究了4种偶联剂KH-550、KH-792、WD-60和HG-305对白炭黑／SBR复合材料力学性能和热空气老化性能的影响。研究结果表明：当KH-550用量为4．0份时,复合材料的综合力学性能最好,与未改的白炭黑／SBR复合材料相比,其拉伸强度和撕裂强度分别提高了77％和24％;复合材料的老化实验结果表明,经偶联剂改性的复合材料的耐热老化性能有所下降,其中HG-305改性的复合材料抗老化性较好。     

Preparations of silica slurry for wafer polishing via controlled growth of commercial silica seeds

Silica slurry in aqueous medium for wafer polishing was prepared by sol-gel reaction of silicon alkoxide utilizing commercial silica particles as seeds that were grown stepwise through intermittent additions of tetraethylorthosilicate (TEOS) as a silica precursor. Before the growth reaction, the commercial silica particles were pre-treated in the vibratory mill partially filled with zirconia ball and the sonicator to ensure good dispersion. The alcohol left after growth reaction was removed by vacuum distillation and repeated washings with distilled water followed by centrifugations. Then, the alcohol-free silica particles were redispersed in water. The dispersion stability of the silica slurries was examined by measuring surface charge of silica particles and rheological properties. Finally, wafer-polishing performance of the prepared silica slurries was considered by measuring the polishing (or removal) rate, and RMS (root mean square) roughness of the polished wafer surface. For the polishing, MEA (monoethanolamine) and TMAH (tetramethylammonium hydroxide) were used as polishing accelerators. The polishing result showed that the removal rate was nearly independent of the concentrations of MEA and TMAH in the range of 0.3-0.5 wt% and 100-500 ppm, respectively. One of the most interesting features is that hydrothermal treatment of the prepared silica slurries in autoclave increased the removal rate as high as ten times. Although the removal rate was increased by the increased size of the abrasive particle, surface roughness of the polished wafer surface was deteriorated.     

天然虾青素改性白炭黑/天然橡胶复合材料的制备与性能

采用天然虾青素对白炭黑表面进行物理改性，并与天然橡胶（NR）制备成复合材料。利用RPA、DMA、SEM等测试手段对天然虾青素改性白炭黑/天然橡胶复合材料的结构与性能进行表征。结果表明，在硫化特性方面，与未采用天然虾青素改性白炭黑相比，采用天然虾青素改性白炭黑所得胶料的焦烧时间和工艺正硫化时间均缩短，促进了橡胶的硫化过程；在物理力学性能方面，所得硫化胶的拉伸强度基本不变，回弹性和耐磨性明显增加，压缩生热降低；在动态黏弹性方面，所得硫化胶的Payne效应明显降低，填料的分散性在一定程度上得到改善；在动态力学性能方面，所得硫化胶的滚动阻力降低，玻璃化转变温度提高。特别地，在耐老化方面，天然虾青素改性白炭黑/天然橡胶复合材料的耐热空气老化性能明显提高。     

Effect of nano-sized mesoporous silica MCM-41 and MMT on corrosion properties of epoxy coating

This study investigated the effect of co-incorporation of two different kinds of nano materials with different forms, layers (Na-MMT) and mesoporous silica particles (MCM-41), into the polymer matrix on the corrosion performance of epoxy resin. Correspondingly corrosion performance of the coatings was studied by electrochemical impedance spectroscopy (EIS) in 3.5% NaCl aqueous solution and salt spray test. The X-ray diffraction (XRD) measurement showed that the Na-MMT layers were exfoliated and the hexagonal framework structure of MCM-41 was retained during and after the composite preparation. The co-incorporation of Na-montmorillonite (Na-MMT) and MCM-41 into the epoxy coating possessed the best corrosion resistance than incorporating either Na-MMT or MCM-41 particles separately due to different interfacial structures between the fillers and the matrix.     

Preparation and characterization of waterborne epoxy latexes and epoxy/(silica sol) composites

A series of waterborne epoxy latexes was synthesized, and epoxy/(silica sol) composite latexes were prepared. The effects of functional monomer methacrylic acid (MAA) and silica sol on the latex particle size, morphology, and stability were investigated. With increasing amounts of MAA, the conversion rate increased, the particle size reduced, and the viscosity of the epoxy latexes increased. The epoxy latexes had storage stability and could be stored at room temperature for more than 6 months with a solid content variation of less than 1%. For the (silica sol)‐modified waterborne epoxy latexes, the effects of preparation techniques and silica sol content on the latexes and latex films were investigated. When the silica sol content increased, the particle size of the composite latexes decreased. The morphology investigation showed that when the silica sol content increased, the uneven surface level of the latex films was increased. The increase of elemental silica on the surface was in accord with the improvement of the water resistance of the composite latex films. The heat resistance of these films was improved as well, and their overall performance was better than that of the epoxy latex films. J. VINYL ADDIT. TECHNOL., 20:57–64, 2014. © 2014 Society of Plastics Engineers     

Preparation of monodispersed silica spheres and electrospinning of poly(vinyl alcohol)/silica composite nanofibers

In this study, monodispersed silica spheres were successfully synthesized by seed‐growth method and they can be highly dispersed in the poly(vinyl alcohol)(PVA) solution. PVA/silica composite fibers were fabricated by electrospinning the composite solutions containing different amount of silica. Further investigation showed that the size distribution of silica sphere was monodispersed and the spheres were homogeneously dispersed in the fibers individually. The composite fibers showed an uniform and continuous morphology with a average diameter of 298–345 nm. The as‐spun nanofibers were characterized by Field Emission Scanning Electron Microscope (FE‐SEM), transmission electron microscopy (TEM), X‐ray diffraction (XRD), and thermal gravimetric analysis (TGA). POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers