共查询到20条相似文献,搜索用时 156 毫秒
2.
3.
钢骨架聚乙烯塑料复合管集钢骨架的高强度和聚乙烯塑料的耐腐蚀性于一体,同时具有优异的抗环境应力开裂能力,已广泛应用于石油、化工、供水等多个领域。文章主要针对钢骨架聚乙烯塑料复合管在低温条件下的抗冲击性能及周长尺寸的稳定性进行了试验探讨,结果表明,钢骨架塑料复合管具有优异的低温抗冲击性能,周长尺寸收缩程度较小,为工程安装提供有力的数据支持。 相似文献
4.
5.
6.
7.
何辉 《中国石油和化工标准与质量》2012,33(16):94
主要介绍钢骨架复合管的特点、工艺原理、工艺流程和安装等注意事项。结合实例表明钢骨架塑料复合管的性能优越,便于施工安装,使用的效果好。 相似文献
8.
9.
管道输送是一种经济、安全的运输方式,在石油、天然气、电力、煤炭、化工以及城市供水等各领域都得到广泛的应用。针对各种气体、液体以及固液体混合体的输送,一种融合了传统金属管材和非金属管材优点的、具有理想强度与优良耐蚀性能的新材料钢骨架塑料复合管应运而生。它在机械强度、耐腐蚀、耐热等方面具有卓越的性能。本文通过介绍钢骨架塑料复合管结构、性能及应用,说明钢骨架塑料复合管在油田等多领域广阔的应用前景。 相似文献
10.
阐述塑料压力管道的技术进展,指出衬套结构的钢塑复合管在工作温度较高或真空度较高的工况下,钢与塑料间会脱开,由于膨胀的差异法兰接口处会开裂,影响使用效果。钢骨架塑料复合管以钢丝网为骨架,塑料覆盖其四周,采用真空挤塑技术消除了复合层中的气泡,从而保证了塑料压力管道的机械强度、热膨胀量及管壁内外一致的抗腐蚀性能,经不同工况使用证实,钢骨架塑料复合管的适用范围广,运行费用低,具有良好的推广前景。 相似文献
11.
12.
13.
14.
15.
Oxidative stability of flax and hemp oils 总被引:1,自引:0,他引:1
Reem Abuzaytoun Fereidoon Shahidi 《Journal of the American Oil Chemists' Society》2006,83(10):855-861
Oxidative stability of flax and hemp oils, and of flax and hemp oils stripped of their minor components, was evaluated in
the dark at 60°C and under fluorescent light at 27°C. Several analytical methods were used to assess the oxidative stability
of oils. Oil extracts were also investigated for their scavenging of 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and for
their total phenolic contents. The results indicate that bioactive constituents of these edible oils play a major role in
their oxidative stability. However, the FA composition of the oils and their total content of tocopherols as well as the type
of pigments present contribute to their stability. Nonstripped flax and hemp oils were more stable than their corresponding
stripped counterparts. Furthermore, nonstripped hemp oil had a higher oxidative stability than nonstripped flax oil as evidenced
by scavenging of DPPH radical and consideration of total phenolic contents. 相似文献
16.
SO42-/MxOy固体超强酸的研究进展 总被引:16,自引:0,他引:16
SO^2-4/MxOy固体超强度是70年代发展起来的一种新型催化材料,笔者参考国内外此领域的最新文献,详细综述了SO^2-4/MxOy固体超强酸的的轩,酸强度测定,结构表征及其在有机合成中的应用等方面的研究进展,并指出了今后的固体超强酸的发展趋势。 相似文献
17.
研究了3-溴香豆素磺酰脲类化合物降血糖活性与化学结构之间的关系,为进一步设计合成该类化合物提供理论依据。研究方法是首先选择14个化合物进行药效学研究,然后再对这些化合物利用MM2分子力学计算有关结构参数并进行定量构效关系研究,研究结果表明3-溴香豆素磺酰脲的降血糖活性与化合物的最小能量呈负相关,初步结论是该类化合物脲基取代基为脂肪基时,化合物的能量相对较小,降血糖活性较高。 相似文献
18.
聚苯醚/聚酰胺合金的研究 总被引:6,自引:0,他引:6
借助扫描电子显微镜和差示扫描量热仪以及动态粘弹谱仪等仪器,研究了聚苯醚/聚酰胺合金的工艺、结构和性能的关系。实验表明,同一种聚苯醚/聚酰胺合金因其加工工艺条件不同,其结构形态不同;韧性相差较大的同类材料,其结构形态也不同,但其DSC曲线与动态粘弹谱曲线却无明显区别。 相似文献
19.
Muhammad Saif Ullah Khan Zareen Akhter Touseef Naz Arshad Saleem Bhatti Humaira M Siddiqi Mohammad Siddiq Abbas Khan 《Polymer International》2013,62(2):319-334
Some novel ferrocene‐containing polyamide‐based block copolymer materials with telechelic polydimethylsiloxane oligomer and their organic analogues were prepared by solution‐phase polycondensation of ferrocene‐based organometallic and terephthaloyl‐ as well as isophthaloyl‐based organic acyl chlorides with a series of semi‐aromatic diamines having ether linkages together with variable aliphatic character. The corresponding polyamides of the synthesized materials, without polydimethylsiloxane segment, were also prepared for comparison of physicochemical properties. None of the synthesized organometallic and organic block copolymers along with their respective polyamides melted below 300 °C and their structural features were confirmed by their physical properties and spectroscopic studies. The weight‐average molecular weights and molecular parameters of all these materials were determined by the static laser light scattering technique. The materials were soluble in sulfuric acid and partially soluble in common organic solvents, and yet became readily soluble upon N‐trifluoroacetylation. The synthesized materials were further characterized by their water absorption characteristics, X‐ray diffraction studies and surface morphology (SEM and AFM) and thermal (DSC and TG) analyses, and their structure–property relationships were elucidated from these studies. The energies of pyrolysis for these materials were calculated by the Horowitz and Metzger method. © 2012 Society of Chemical Industry 相似文献
20.
(接上期) 2.3.1提升力的拼混增效 原来设想染料A1和A4拼混,由于连接基不同,A4的N上多了乙基,会使染料在提升力上增加很多.事实证明,增深是有一些,但效果不是非常明显. 相似文献