共查询到20条相似文献,搜索用时 125 毫秒
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介绍了耐热改性PVC塑料管材改性原理及制造工艺,指出了耐热改性PVC塑料管材的特性,应用范围及发展前景。 相似文献
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PVC—U管材的生产 总被引:1,自引:0,他引:1
以普通PVC-U管材为例,探讨了生产PVC-U管材的配方及原材料选择原则,阐述了PVC-U管材的成型工艺,对成型加工过程中容易出现的一些质量问题,提出了切实可行的解决方案。全面介绍了PVC-U管材成型过程中使用的挤出设备、模具及辅助机械。 相似文献
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从原材料、混料、设备与模具、配方、加工工艺等方面探讨了影响PVC-U给水管材耐压性能的影响因素,并通过一系列配方和工艺试验予以验证。 相似文献
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郑宁来 《合成材料老化与应用》2006,35(2):61
塑料管材在我国建筑业中应用越来越广,据预测,“十一五”期间,平均每年塑料管材用量将超过200万t。塑料管材产业的发展将以PE管材和PVC—U管材为重点,并大力发展其他新型塑料管材。 相似文献
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聚氯乙烯(PVC)管材是当代工业中广泛应用的一种塑料管材,依增塑剂含量的多少可分为硬质PVC(PVC-U)管材和软质PVC (PVC-P)管材。主要讨论了几种PVC管材生产过程中工艺流程和工艺参数的选择依据,以及PVC管材生产过程中的质量控制。 相似文献
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研究了氯化聚氯乙烯(PVC-C)/聚氯乙烯(PVC)/抗冲击改性剂(CPE/ACR)共混体系对埋地式高压电力电缆PVC-C护套管的维卡软化温度和力学性能的影响。结果表明,在基础配方不变的情况下,PVC-C/PVC共混体系中,随着PVC-C含量的增加,管材的维卡软化温度提高,抗冲击性能下降;在PVC-C/PVC配比不变的情况下,冲击改性剂CPE(氯化聚乙烯)和抗冲ACR(丙烯酸酯类共聚物)的加入份数的提高,管材的抗冲击性能提高,维卡软化温度降低。 相似文献
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PVC-C/PVC/MBS三元共混材料的研究 总被引:1,自引:0,他引:1
研究了氯化聚氯乙烯(PVC-C) /聚氯乙烯(PVC)与抗冲改性剂MBS[聚丁二烯(PB)与甲基丙烯酸甲酯(MMA)及苯乙烯(St)按枝共聚物]的二儿共混物的物理力学性能和流变性能。结果表明:共混物的维卡软化点随PVC-C用量的增加而上升,在PVC-C/PVC=50 /50(质量比)处有一拐点。共棍物的拉伸强度、弯曲模量随PVC-C用量的增加而提高; 而冲山强度和断裂伸长率都随PVC-C用量增加而下降。共棍物中随PVC-C用量增加,塑化能力增强,平衡转矩上升。不同的加工助剂可降低共棍物熔体黏度,改善加工性能。 相似文献
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塑料管材用原料及模具设计和成型技术进展 总被引:2,自引:0,他引:2
论述用于生产承压塑料管材的塑料原料的等级划分和标记,介绍几种热塑性塑料材料,如聚乙烯,聚丙烯、氯化聚氯乙烯,聚丁烯和交联聚乙烯的物理性能及其在管材上的应用,对热塑性塑料管材的挤出模具,定型套和挤出设备的最新发展进行了综述。 相似文献
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氯化聚氯乙烯(PVC-C)管材的研制 总被引:4,自引:0,他引:4
氯化聚氯乙烯(PVC-C)管材是国外九十年代发展起来的产品,由于材料的特殊性能使加工和配方带来了困难。本文就氯化聚氯乙烯埋地式电力电缆(高压和超高压)保护套管,衬管和非饮用热水管等的研制进行了论述。重点从原材料,与各种添加剂的配合,工艺设置,加工设备和温度,使用场合方面作了介绍。 相似文献
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PVC pipes are generally stabilized with lead, tin, or calcium-zinc based additives. The performance of PVC products in outdoor applications is highly dependent on the types of stabilizers used and environmental factors such as UV radiation, temperature, humidity, rain, dust, etc. This study involves two-year exposure of a lead-stabilized and titanium dioxide-pigmented PVC pipe at Dhahran (Saudi Arabia) and Miami, Florida. The white pigmented PVC pipes are mostly used outdoor for low pressure potable water services, irrigation in greenhouses, and electrical conduits in Saudi Arabia. The PVC pipe formulation stabilized with Pb-stabilizer provides good light stability and is also widely used for potable water pipes. The pipes are exposed not only to the natural environment during outdoor usage but also to high UV doses, and to high temperatures during transportation, installation, and long-term storage. Changes in the exposed pipe were monitored using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetery (DSC), and mechanical properties testing. The data show that the PVC pipe lost 50 percent of its elongation at break within 12 to 16 months at Dhahran and more than 24 months in Florida during outdoor exposure. The growth of carbonyl groups and the lowering of the glass transition temperature (Tg) was also observed during this exposure period. The extents of degradation of the PVC pipe exposed at the Dhahran and Florida sites were compared. 相似文献
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A. S. Pazur 《乙烯基与添加剂工艺杂志》1988,10(3):154-157
This study examines the recyclability of PVC bottles into other PVC products. Post consumer bottles can potentially be granulated and used, without further treatment, in the production of these products. Washing will allow the granulate to recover most of the properties of the original bottle compound, by removing paper labels and residual product contamination. Plastic contaminants, such as those from caps and other plastic bottles, show little effect on several physical properties at levels up to 3%. This granulate can thus be used as a significant portion of the raw material feed for a number of PVC products including DWV (drain/waste/vent) pipe, pipe fittings, rigid sheet, bottles, etc. Post consumer PVC bottle granulate thus constitutes a valuable resource; the recyclability of PVC packaging thus is a question of collection. 相似文献
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采用氯化聚乙烯(CPE)对氯化聚氯乙烯(PVC—C)进行抗冲改性,将改性后的PVC—C与PVC进行共混,研究了PVC-C/PVC配比对PVC-C/PVC共混物力学性能、耐热性能及流变形能的影响。结果表明,PVC—C/PVC共混物的维卡软化点随PVC—C的用量增加而上升,在50/50(质量比)处有一拐点,大于50/50时上升更快些。共混物的拉伸强度、弯曲强度和熔体黏度随PVC—C用量的增加而提高;混物中随PVC—C用量增加,塑化时间缩短,塑化能力增强,而冲击强度和断裂伸长率却随PVC—C用量增加而下降。共平衡转矩增加。 相似文献