共查询到14条相似文献,搜索用时 62 毫秒
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简要介绍了PP-R管材的性能和应用,分析了市场容量、前景和价格走势,简述了生产工艺技术,并进行了技术经济评价。 相似文献
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PP—R管材专用料及其管材机组 总被引:1,自引:0,他引:1
何顺伦 《现代塑料加工应用》2001,13(2):29-30
讨论了PP-R与PP-B、PP-H在流变学及蠕变强度方面的区别,并简单介绍了适应于生产PP-R管材装备的主要技术特征。 相似文献
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PP—R管材是采用丙烯一乙烯无规共聚聚丙烯材料经挤出成型的管材。PP—R管材除具有普通塑料管的特性外,还具有较好的抗冲击性能,耐温性能,良好的热熔焊接性能和物料可回收利用等特性,是一种技术经济性能都较好的新型管材。 相似文献
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福州市科研人员开发成功的中亭牌PP-R给水管材最近被福建省建设厅列为该省建材科技成果推广项目。PP-R管具有卫生、无毒、保温、流水阻力小、耐腐蚀、不结垢等特点,最高使用温度可达120℃,寿命达50年,PP-R管的导热系数 相似文献
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目前有二种被称为“PP—R稳态管”产品正在兴起,一种是用短波纤改性PP—R作为中间层,内外层仍用PP—R,用三台挤出机通过共挤复合形成三层结构的PP—R管,管件没有变化。另一种是在PP—R管外表面包复一层0.15mm厚的铝箔,使用时要用工具剥去管端的铝层,仍用热 相似文献
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以共聚聚丙烯的核磁共振、低温抗冲击性、低温力学损耗因子、红外光谱及熔点等五个方面的数据差异来区分PP-R和PP-B(或PP-C),为辨别PP-R提供新方法。 相似文献
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建筑供排水用聚丙烯管道(PP-R)特性简析 总被引:2,自引:0,他引:2
PP -R管道具有质轻、连接方便、良好耐热性和较小导热系数、耐腐蚀且管道阻力小等优点 ,属绿色产品 ,本文对施工过程中就PP -R管与混凝土的粘结不密、抗紫外性能差等问题提出了相应的处理措施 相似文献
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Jiro Ogura Toshihiro Sato Kei Higuchi Sathish Sivaprakasam Jonathan Kopel Yangzom D. Bhutia Vadivel Ganapathy 《International journal of molecular sciences》2022,23(12)
NaCT mediates citrate uptake in the liver cell line HepG2. When these cells were exposed to iron (Fe3+), citrate uptake/binding as monitored by the association of [14C]-citrate with cells increased. However, there was no change in NaCT expression and function, indicating that NaCT was not responsible for this Fe3+-induced citrate uptake/binding. Interestingly however, the process exhibited substrate selectivity and saturability as if the process was mediated by a transporter. Notwithstanding these features, subsequent studies demonstrated that the iron-induced citrate uptake/binding did not involve citrate entry into cells; instead, the increase was due to the formation of citrate-Fe3+ chelate that adsorbed to the cell surface. Surprisingly, the same phenomenon was observed in culture wells without HepG2 cells, indicating the adsorption of the citrate-Fe3+ chelate to the plastic surface of culture wells. We used this interesting phenomenon as a simple screening technique for new iron chelators with the logic that if another iron chelator is present in the assay system, it would compete with citrate for binding to Fe3+ and prevent the formation and adsorption of citrate-Fe3+ to the culture well. This technique was validated with the known iron chelators deferiprone and deferoxamine, and with the bacterial siderophore 2,3-dihydroxybenzoic acid and the catechol carbidopa. 相似文献