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利用防火涂料对化工装置进行防火保护是一种经济、易行、方便的火灾防护方法。以传热学原理为基础,分析了防火涂料的防火保护原理,讨论了防火涂料在化工储罐、石油管道中的使用要求,应用设计原则。运用层次分析法系统地提出了化工储罐、石油管道防火涂料的选用原则、选型的指标要求以及优选方法。 相似文献
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硼酚醛树脂具有优良的阻燃、耐高温、低烟、低毒等特性。本文以酚醛树脂为主防火剂、胺类为协效剂,分析了对丙烯酸树脂防火性能的影响。参照试验单位实验结果发现,硼酚醛树脂能显著提高丙烯酸树脂的防火性能,硅酸铝、六次甲基四胺具有有良好的协效作用。硼酚醛改性丙烯酸树脂膨胀型防火涂料原料组成简单、来源丰富、成本较低、防火性能好,具有很好的应用前景。 相似文献
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研究防火涂料热解反应动力学分析模型和阻燃层制备方法,提出一种加入换热离子涂层的防火涂料阻燃层制备方案。进行换热离子涂层阻燃剂的制备和防火涂料阻燃层制备,测定防火涂料性能,分析热量吸附等温线,得到防火涂料制备聚合反应流程。实验结果表明,设计的防火涂料阻燃层热解残余物炭物质较多,从而使该防火涂料经久耐烧,具有高效隔热防火性能,提高其耐火性和热解反应的活化能力。阻燃层与其它各组分防火涂层达到最佳的协合,形成一个完整、有机的防火体系。研究得出的防火涂料阻燃层具有优良的阻燃性能和防火性能,保证了消防安全。 相似文献
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简要介绍了钢结构防火涂料的防火原理,分析了当前厚涂型、薄涂型,超薄型及室外钢结构防火涂料的研究和应用,及其在使用过程中存在的主要问题,并提出了具体的改进措施,对我国钢结构防火涂料今后的发展进行了展望并提出建设性的意见. 相似文献
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防火涂料的研究现状、存在问题及发展前景 总被引：2，自引：0，他引：2
通过对防火涂料的研究现状、存在问题及发展前景的讨论,研究了防火涂料在当前使用情况下的各种形式,指出在研究和施工过程中其存在的一些主要问题,通过对现状和存在问题的讨论得出防火涂料的研究方向、发展前景并提出展望. 相似文献
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本文通过建筑钢结构的防火要求、方法的论述，介绍了钢结构防火涂料的类型、特点和在钢结构中的应用。对防火涂料的技术要求和性能指标进行了研究和分析。 相似文献
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在机械强度好,孔隙率高、阻力小的涤纶滤布上涂覆强亲水性的聚乙烯醇材料,制备了滤布-PVA素水膜.研究了利用该膜处理油水乳化液的可行性.结果表明,在操作压力为0.05Mpa下处理质量浓度为1 000mg/L的O/W型乳化液,可获得140L/m2·h的膜通量,除油率达到82.3%. 相似文献
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尤静娴 《科技成果管理与研究》2011,(7):67-68
在液混式膨化硝铵炸药生产线上,研究探索一种新的油相材料,产品配方不变,仅对相关工艺及工艺参数进行调整完善,生产出的炸药具有优良的爆炸性能,抗水性能。 相似文献
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J. B. Varuna Kumara N. R. Ravikumara Basavaraj Madhusudhan 《Indian journal of clinical biochemistry : IJCB》2016,31(4):390-401
Folic acid is used for preventing and treating multiple diseases and disorders, administered in the form of oral supplements. The present research work was aimed to study the influence of two non-ionic surfactants Poloxamer and Tween 80 (Polysorbate 80) on pectin submicrospheres formulations. Typical natural polymer pectin was used to encapsulate folic acid by cross linking method. The resultant submicrospheres contributed to improve the aqueous solubility to enhance the bioavailability of folic acid. During investigation, it was observed that pectin polymers influenced kinetics of the rate of reaction more intensively than the surfactants. The physical phenomenon caused the change in their size, shape and chemistry of pectin polymers transforming into submicrospheres in aqueous condition. The characteristic differences of submicrospheres were assessed by scanning electron microscopy, differential scanning calorimetry and Fourier-transform infrared spectroscopy. The average diameters of the submicrospheres ranged between 250 and 500 nm. The encapsulation efficiency of submicrospheres ranged between 80 and 96 %. The characteristic swelling behavior of lyophilized submicrospheres was influenced by the ratio of pectin polymers and folic acid used in the formulations. The submicrospheres systems exhibited controlled release of folic acid due to the pH-dependent solubility of pectin polymers in aqueous medium. The submicrospheres showed good haemocompatibility suggesting them to be promising candidates for oral delivery. 相似文献
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Cara Young Kester Rozario Christophe Serra Laura Poole-Warren Penny Martens 《Biomicrofluidics》2013,7(4)
Biosynthetic microspheres have the potential to address some of the limitations in cell microencapsulation; however, the generation of biosynthetic hydrogel microspheres has not been investigated or applied to cell encapsulation. Droplet microfluidics has the potential to produce more uniform microspheres under conditions compatible with cell encapsulation. Therefore, the aim of this study was to understand the effect of process parameters on biosynthetic microsphere formation, size, and morphology with a co-flow microfluidic method. Poly(vinyl alcohol) (PVA), a synthetic hydrogel and heparin, a glycosaminoglycan were chosen as the hydrogels for this study. A capillary-based microfluidic droplet generation device was used, and by varying the flow rates of both the polymer and oil phases, the viscosity of the continuous oil phase, and the interfacial surface tension, monodisperse spheres were produced from ∼200 to 800 μm. The size and morphology were unaffected by the addition of heparin. The modulus of spheres was 397 and 335 kPa for PVA and PVA/heparin, respectively, and this was not different from the bulk gel modulus (312 and 365 for PVA and PVA/heparin, respectively). Mammalian cells encapsulated in the spheres had over 90% viability after 24 h in both PVA and PVA/heparin microspheres. After 28 days, viability was still over 90% for PVA-heparin spheres and was significantly higher than in PVA only spheres. The use of biosynthetic hydrogels with microfluidic and UV polymerisation methods offers an improved approach to long-term cell encapsulation. 相似文献
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稠油油藏水驱采收率低,因其原油黏度高,不适合转化学驱,但转热采可大幅提高采收率。林樊家油田林东馆三段地质条件复杂,地层敏感性强,供液差,产能低,油稠,出砂严重,多年来采用了各种工艺措施,均未取得好的水驱开采效果。在分析低效水驱原因的基础上,论证了水驱转蒸汽热采可行性。开发实践表明,低效水驱稠油油藏通过转热采可大幅提高采收率,同时研究成果对同类油藏的开发具有重要指导意义。 相似文献
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F.M. Clark 《Journal of The Franklin Institute》1933,215(1):39-67
The characteristics of gas solution in mineral oil are discussed. Data covering the changing gas solubility with temperature and pressure are given.The dielectric strength of oil is shown to be dependent on the kind and amount of its dissolved gas. The dielectric strength-gas content of oil bears a close relation to the recognized dielectric behavior of air itself.It is suggested that the usual dielectric strength of oil measures only the ease of oil “gassing” which may be dependent in part- at least, on dissolved impurities. 相似文献
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Neda Dadgar Maedeh Koohi Moftakhari Esfahani Sepideh Torabi Seyed Ebrahim Alavi Azim Akbarzadeh 《Indian journal of clinical biochemistry : IJCB》2014,29(4):501-504
This study is aimed to investigate the nanoliposomal artemisinin preparation, and its implementation on breast cancer cells. Side effects have been one of the common challenges of drug usage, as well as cancer treatment. In order to reduce such effects, nanotechnology has been a great help. Nanoliposomes are provided through reverse phase evaporation. In this method, certain proportions of phosphatidylcholine, cholesterol and artemisinin were mixed together. Besides, the obtained formulation was pegylated by using polyethylene glycol 2000 in order to increase its stability and solubility. The mean diameter of non-pegylated and pegylated liposomal artemisinin was determined by Zeta sizer system. The percent of drug released from liposome was performed by dialysis. The encapsulation efficiency of both formulations was estimated by spectrophotometry method. As a result, encapsulation and drug release of nanoliposomal formulation were more than the pegylation of the same formulation. In addition, this study indicated that cytotoxicity effect of pegylated nanoliposomal artemisinin was more, in comparison with nanoliposomal artemisinin. 相似文献
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纳米流体脉动热管的性能实验研究 总被引：2，自引：0，他引：2
建立了脉动热管的可视化实验台,对以体积分数为1%的TiO2/H2O和CuO/H2O纳米流体及基流体为工质,55％充液率的脉动热管性能进行了实验研究。结果表明,工质静止时,纳米颗粒在脉动热管中会发生沉淀,但工质的运动能够使沉淀纳米颗粒再次悬浮,随着温度的升高,纳米颗粒悬浮性稳定减弱;与基流体工质相比,纳米流体脉动热管的最小启动功率低,启动时间较短,工作温度低,传热热阻小,温度波动振幅小、频率高;纳米流体能大幅提高脉动热管的传热性能,工作温度为110℃时,蒸馏水、TiO2/H2O及CuO/H2O脉动热管的传热热阻分别为0.23℃/W,0.11℃/W和0.13℃/W;两种纳米流体脉动热管的传热性能接近。 相似文献
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超疏水性纳米界面材料的制备与研究 总被引：8，自引：0，他引：8
制备并研究了几种超疏水性纳米界面材料,具体包括(1)以多孔氧化铝为模板,通过一种新的模板挤压法制备了聚丙烯腈纳米纤维,该纤维表面在没有任何低表面能物质修饰时即具有超疏水性,与水的接触角可高达173.8°.(2)利用亲水性聚合物聚乙烯醇制备了具有超疏水性的表面,打破了传统上只有利用疏水材料才能得到超疏水性表面的局限性,扩大了制备材料的应用范围.研究表明,这种特殊的现象是由于聚乙烯醇分子在纳米结构表面发生重排,使得疏水基团向外,分子间氢键向内,从而导致整个体系的表面能降低引起的.(3)将聚丙烯腈纳米纤维通过典型的热解过程,得到了具有类石墨结构的纳米结构碳膜,该膜表面在广泛pH值范围内都具有超疏水的特征,在基因传输、无损失液体输送、微流体等方面具有更广阔的应用前景.(4)利用喷涂-干燥技术制备了一种新型的同时具有超疏水及超亲油性的油水分离网膜.研究表明,网膜表面特殊的微米与纳米尺寸相结合的粗糙结构导致这种特殊的性质,该网膜具有很高的油水分离效率,具有极其广阔的应用前景. 相似文献