Effect of comb-type copolymer on crystallization of paraffin from waxy oils and methyl ethyl ketone (MEK) -toluene dewaxing

In this research, maleic anhydride-α-octadecene copolymer and its derivative with phenylethylamine was synthesized and its effect on the crystallization of paraffins was investigated. This derivative, when added into second cut of vacuum gas oil and forth cut of vacuum gas oil, increases the size and improves aggregation of paraffin crystals observed by polarizing light microscopy, increases onset temperature and enthalpy of paraffin crystallization determined by differential scanning calorimetry, improves the dewaxing efficiency with dosage of 100?ppm explored by MEK-toluene dewaxing.     

丙烯酸在石蜡微胶囊制备中的应用

以甲基丙烯酸甲酯(MMA)、丙烯酸(AA)和石蜡为原料,采用悬浮聚合法制备了石蜡/P(MMA-co-AA)相变储能微胶囊。研究了MMA与AA加入比例、油相与水相质量比等因素对石蜡微胶囊芯材含量等的影响,利用扫描量热仪(DSC)、电子显微镜(SEM)表征了所制备石蜡微胶囊的热性能、形貌等。结果表明:AA加入比例过大时,微胶囊易结块,不易形成微胶囊,微胶囊轮廓呈球形,其相变温度为27.21℃,相变潜热为81.58 J/g,芯材含量达到72.32%。     

石蜡氯化反应异常停止的原因

氯化石蜡生产中因液氯质量问题引起反应终止,分析了影响液氯质量的因素（主要是液氯中硫酸、二氧化硫、铁的化合物、水分、光气及二氧化氯等含量超标）,提出了解决措施.     

基于微波加热的热膨胀微球/石蜡/石墨自修复功能材料的制备及其在砂浆中的应用

以热膨胀微球、石蜡和石墨为原料制备了一种快速修复混凝土裂缝的新型微波加热自修复功能材料(MHSFM)。研究了热膨胀微球掺量对MHSFM体积膨胀率的影响,测试了在微波作用下MHSFM和掺加MHSFM砂浆的升温速率,评价了MHSFM掺量对砂浆力学性能、抗渗性能和自修复性能的影响。结果表明,MHSFM的体积膨胀率随着热膨胀微球掺量增加而增大。在微波作用下,砂浆的升温速率随MHSFM掺量的增加而明显加快。MHSFM对砂浆的力学性能和抗渗性能有一定的影响,但会显著增强砂浆的自修复性能,掺加12%(质量分数)MHSFM的砂浆在微波作用下可快速愈合0.53 mm的裂缝。     

纳米铜修饰多壁碳纳米管/石蜡相变驱动复合材料的制备及热性能

以油胺为分散稳定剂,在石蜡中热分解甲酸铜-碳纳米管复合物前驱体,单步制备了纳米铜修饰多壁碳纳米管(Cu-MWCNTs)/石蜡复合材料。通过XRD、TEM和DSC对Cu-MWCNTs/石蜡复合材料的物相、微观形貌及相变行为进行了表征和分析,并对其热敏性、热膨胀性和热稳定性及影响因素进行了分析研究。结果表明:纳米Cu原位沉积在MWCNTs外壁上,粒径为2~35nm。与纯石蜡相比,Cu-MWCNTs/石蜡复合材料的相变温度和相变潜热均明显降低。Cu-MWCNTs含量为0.2wt%的Cu-MWCNTs/石蜡复合材料具有较短的升温时间,体膨胀率降低较小,且多次加热后稳定性较好,可作为此类热敏微驱动器的理想材料。     

Development of paraffin and paraffin/bitumen composites with additions of B2O3 for thermal neutron shielding applications

In this work, paraffin and paraffin/bitumen composites with additions of boron oxide (B₂O₃) were prepared to evaluate the viscosity, flexural, and thermal neutron shielding properties for uses as thermal neutron shielding materials. The results showed that the addition of 3 wt% or 9 wt% bitumen to paraffin increased the overall flexural properties with the content of 9 wt% bitumen having the highest values. The improvement in flexural properties made the composites less brittle, stiffer, and longer-lasting. Furthermore, different contents of B₂O₃ (0, 7, 14, 21, 28, and 35 wt%) were added to paraffin and paraffin/bitumen composites to investigate the effects of the B₂O₃ contents. The results indicated that an increase in B₂O₃ contents improved the shielding properties but slightly reduced the flexural properties. Specifically for 5-mm paraffin and 5-mm paraffin/bitumen samples with 35 wt% of B₂O₃, both samples could reduce neutron flux by more than 70%. The overall results suggested that the paraffin and paraffin/bitumen composites with additions of B₂O₃ showed improved properties for utilization as effective thermal neutron shielding materials.     

复配石蜡/膨胀珍珠岩相变颗粒的热性能研究

通过固体石蜡与液体石蜡熔融混合复配制成低熔点相变石蜡,其中以固液比1:1制备的相变石蜡熔点为25.1℃,潜热为104.3kJ/kg.500次冷热相变循环后石蜡的热物性仅轻微衰减,热化学稳定性好.利用多孔膨胀珍珠岩吸附熔融石蜡可以制备石蜡,膨胀珍珠岩相变颗粒,其中石蜡:珍珠岩质量比为3.5:1.0的相变颗粒不团聚,石蜡含量最高为77.78%.通过SEM、FT-IR、DSC等表征手段测得:该相变颗粒熔点为25.6℃,潜热为80.3k/Ag,具有优良的热物性;相变颗粒仅仅是石蜡和膨胀珍珠岩的嵌合,可以加入到墙体材料中用于建筑节能.     

综合清防蜡技术在油田的应用

简述了川口油田的地质地貌状况，并对近几年的油井清蜡状况进行了总结。概括了近些年油井清蜡方式发展状况，着重介绍了负压热洗清蜡，分析了油井清防蜡工艺改造的发展方向。     

铜/石蜡热敏材料的制备及其热膨胀性

采用高能球磨法制备了纳米铜/石蜡热敏复合材料。通过扫描电镜(SEM)、高分辨透射电镜(TEM)及自制温控光学测微装置等手段对复合材料微观形貌特征进行了分析研究,并探讨了铜粉和石蜡的质量比以及石蜡的熔点对复合材料膨胀性能的影响。研究结果表明石蜡在铜粒子表面包覆均匀,铜粒子的粒径可以达到70nm左右。铜粉和石蜡的质量比不同,复合材料的体膨胀量也不同。石蜡熔点越高,复合材料的膨胀性能越好。