高效轮胎防刺液的研制

通过单因素实验和正交实验优化了高效轮胎防刺液合成的最佳工艺条件。高效轮胎防刺液合成的最佳工艺条件为：温度为25℃,压力为常压,搅拌速度为300 r/min,水的用量为300 mL,纤维用量为10 g,乙二醇用量为450 mL,聚醋酸乙烯酯的用量为180 mL。并对高效轮胎防刺液的最佳合成实验条件进行讨论。     

智能调温聚氨酯固-固相变材料的研究

采用化学改性的方法,将不同含量,不同分子量的聚乙二醇(PEG)接枝到以聚醚型的聚氨酯(PU)上,制备出一种新型的固-固相变材料。并通过红外光谱法(IR),示差扫描量热法(DSC)来研究合成材料的结构与相变行为。结果表明,PEG成功地接枝在高分子链PU上,且具有较好的相变焓,适合的相变温度,并当PEG分子量相同时,随着PEG含量的增加,相变材料相变焓增大,热切热稳定性有明显改善,当PEG含量相同,PEG分子量在600～2000时,随着分子量的增加,材料的相变焓增大。     

PEG/UPR/石墨烯复合相变材料的制备及其在节能 建筑中的传热性能研究

以聚乙二醇(PEG)为相变储热材料、不饱和聚酯树脂(UPR)为封装载体、石墨烯(GNP)为导热填料,通过熔融共混法制备出新型PEG/GNP/UPR复合相变材料,并采用导热系数测试仪、扫描电镜、差示扫描量热仪及傅里叶红外光谱仪对其进行测试与表征。将PEG/GNP/UPR作为调温材料掺入至水泥墙体中制备出相变储热墙体,利用热流计和温度记录仪测试了PEG/GNP/UPR对水泥墙体的热物性能的影响。试验结果表明,UPR具有丰富的三维网络结构,并能通过物理吸附作用牢牢将PEG分子链段限固与锚嵌其中,此外,GNP的掺入能够显著增强复合相变材料的导热特性,且PEG/GNP/UPR的相变特性与PEG基本相似;在升温过程中,PEG/UPR/GNP不仅能够吸收和储存墙体所受辐射的大量热量,而且PEG/UPR/GNP的掺入使得墙体的密度降低,这也会增大墙体的比热容,进而改善水泥墙体的温度。     

Aflas四丙氟橡胶/EPDM耐水-乙二醇液压油性能

制备了不同并用比例的Afl as四丙氟橡胶/EPDM并用胶,并对其物理性能、耐水-乙二醇阻燃液压油性能、耐低温性能进行了测试和研究。结果表明,Aflas/EPDM并用胶具有较好的耐水-乙二醇液压油性能和低温性能,同时,其成本也得到了大幅度降低。     

铸膜液浓度对聚醚砜超滤膜性能的影响

以聚醚砜(PES)为膜材料,聚乙二醇(PEG4000)为添加剂,N,N-二甲基乙酰胺(DMAc)为溶剂,用溶液相转化法制备了聚醚砜超滤膜.本实验主要研究的是聚醚砜(PES)和聚乙二醇(PEG4000)浓度对膜结构和性能的影响.得出制备聚醚砜超滤膜的最佳条件:PES浓度为15wt％～20wt％,PEG4000浓度为14wt％.     

乙二醇罐内壁涂料的制备及其应用

为储存PET树脂、聚酯等所用原材料乙二醇且保持其品质,采用丙烯酸树脂为基料,TiO2为颜料,制备了储存乙二醇用的内壁涂料,经这些材料的浸泡液进行紫外线透过率的测试的结果表明,该涂料对乙二醇的品质无影响,能使乙二醇储液保持优等品质量不变,在实际应用上也能达到优等品的品质要求,因此该涂料发展潜力极大。     

乙二醇的合成方法

阐述了乙二醇的几个主要合成方法,着重介绍了合成乙二醇的新技术方法：碳酸亚乙酯法。     

纳米铜粉在太阳能集热器循环工质中的分散

以阿拉伯树胶和六偏磷酸钠为分散剂,以乙二醇水溶液为分散介质,采用球磨分散法制备用作太阳能集热器循环工质的铜纳米流体.通过分光光度法和沉降法研究分散剂含量和球磨时间等因素对铜纳米流体稳定性的影响.结果表明,阿拉伯树胶和六偏磷酸钠均能有效的分散铜纳米颗粒,得到均匀、稳定的铜纳米流体.当用阿拉伯树胶作分散剂时,质量分数为0.25%、球磨时间为6h时,分散效果最佳.用六偏磷酸钠作分散剂,质量分数为0.1%、球磨时间为2h时,分散效果最佳.阿拉伯树胶对铜纳米颗粒的稳定分散作用主要是通过空间位阻机制来实现的,而六偏磷酸钠对铜纳米颗粒的稳定分散作用则主要是通过静电稳定机制来实现的.     

Simple methodology for sizing of absorbers for TEG (triethylene glycol) gas dehydration systems

Natural gas is an important source of primary energy and it is saturated with water vapor under normal production conditions. In the design of natural gas dehydration systems, correct estimation of absorption column size is crucial. Once the lean TEG (Triethylene glycol) concentration has been established, the circulation rate of TEG and number of trays (height of packing) must be determined. The current methods to correlate the TEG circulation rate, TEG purity, water removal efficiency, number of equilibrium stages (or height of packing) and the diameter of contactor employs rigorous calculation techniques involving more complicated and longer computations. The aim of this study is therefore to develop a simple-to-use method, by employing basic algebraic equations to correlate water removal efficiency as a function of TEG circulation rate and TEG purity for appropriate sizing of the absorber at wide range of operating conditions of TEG dehydration systems. Estimates from simplified approach were found to be quite reliable and accurate, as evidenced by the comparisons with literature data where the average absolute deviation percent from reported data in the literature shown to be around 0.05%.     

Synthesis,characterization and antibacterial activity of superparamagnetic nanoparticles modified with glycol chitosan

Abstract

Iron oxide nanoparticles (IONPs) were synthesized by coprecipitation of iron salts in alkali media followed by coating with glycol chitosan (GC-coated IONPs). Both bare and GC-coated IONPs were subsequently characterized and evaluated for their antibacterial activity. Comparison of Fourier transform infrared spectra and thermogravimetric data of bare and GC-coated IONPs confirmed the presence of GC coating on IONPs. Magnetization curves showed that both bare and GC-coated IONPs are superparamagnetic and have saturation magnetizations of 70.3 and 59.8 emu g^?1, respectively. The IONP size was measured as ～8–9 nm by transmission electron microscopy, and their crystal structure was assigned to magnetite from x-ray diffraction patterns. Both bare and GC-coated IONPs inhibited the growths of Escherichia coli ATCC 8739 and Salmonella enteritidis SE 01 bacteria better than the antibiotics linezolid and cefaclor, as evaluated by the agar dilution assay. GC-coated IONPs showed higher potency against E. coli O157:H7 and Staphylococcus aureus ATCC 10832 than bare IONPs. Given their biocompatibility and antibacterial properties, GC-coated IONPs are a potential nanomaterial for in vivo applications.