改性PVC树脂生产抗冲型管材

介绍了改进PVC管材性能的方法,简介了PVC-M管材优异的冲击性能、抗开裂性能、耐点载荷能力和可焊性。     

建筑给水用透明PVC管材研制

利用PVC本身透明性较好,研制一种建筑内用中小口径PVC给水管材.     

Characterisation and properties of oriented PVC fibres

Drawn PVC fibres were investigated using birefringence, DSC and TMA techniques, and their tenacity was measured. An increase in fibre draw ratio (DR) for heat set samples produced an increase in tenacity, birefringence and X-ray intensity. The linearity of a tenacity/birefringence plot suggested that tenacity was a good indicator of molecular orientation. An ‘undrawn’ filament was substantially amorphous. Drawing without heat setting produced little three dimensional order, and samples relaxed readily on heating. X-ray results for heat set fibres suggested both an increase in the amount of crystallinity, and in crystallite alignment. After heat setting, a minor DSC endotherm was produced; the onset of this endotherm corresponded to the heat setting temperature, as did the onset of shrinkage measured by TMA. For samples with a DR>1.5, maximum shrinkage measured by TMA corresponded to complete elastic recovery.     

聚氯乙烯透明增强软管专用料的研制

通过对热稳定体系、润滑体系和增塑体系的精心设计和优化试验 ,并通过工业规模的成型加工试验和配方调整 ,研制成功了热稳定性好、易于加工、透明度高和强度高的PVC透明增强软管专用料     

低毒性PVC管道专用胶粘剂的研制

对低毒性PVC管道胶粘剂进行了研究 ,采用过氯乙烯树脂作为粘料 ,采用邻苯二甲酸二丁酯增塑剂对胶粘剂进行改性 ,同时采用低毒性的溶剂组合以溶解粘料树脂。该胶粘剂毒性较低 ,不仅具有较强的粘接强度和连接密封性 ,能符合给水PVC管对卫生指标的要求     

硬质聚氯乙烯管道的技术进步

介绍了PVC-U管道行业的整体情况、PVC树脂及加工助剂的应用情况、建筑用PVC排水管道和压力管道的技术进步,指出了PVC-U管道存在的主要问题和差距,并给出了发展建议。     

Rheology,morphology, and mechanical and thermal properties of recycled PVC pipes

This article demonstrated the possibility of recycling PVC pipes by investigating the effect of adding PVC pipes (varying from 0 to 80 % wt) into two commercial PVC virgin grades on the rheological, morphological, mechanical, and thermal properties of the PVC blends. The results obtained showed an increase in the melt viscosity and no change in the die swell ratio as the concentration of the recycled PVC was increased. The die swell ratio was observed to increase with temperature, this being associated with the presence of gelation that occurred at high temperature. The optimum tensile and impact strengths were detected, the impact strength being explained by use of SEM micrographs of the fracture surface. The hardness result corresponded well to the density of the compounds. The glass transition, degradation, and heat-deflection temperatures were also found to shift with the recycled PVC loading. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2478–2486, 2001     

70m^3PVC聚合釜配套冷凝器的设计与制造

介绍了70m^3PVC聚合釜配套釜顶冷凝器的结构形式,分析了其设计与制造要点。     

Predicting the residual life of PVC sewer pipes

Abstract

Ipswich Water commenced reviewing the service lives of different pipe materials in its gravity sewer system. Unlike other pipe materials, PVC sewers had no failure histories nor deterioration revealed in CCTV inspections, even after 25 years of service. Therefore, establishing a realistic predicted life was not possible using statistical analysis of historical field failure data. The approach taken was to exhume a number of elastomeric seal jointed PVC sewer pipes that had been in service for periods of up to 25 years. The samples were tested for selected mechanical properties and joint performance characteristics which might be considered age dependent. The results indicated there had been no deterioration in the material and the joints continued to meet current performance specifications. Two methods of quantifying the condition of PVC sewer pipelines and predicting the residual life are suggested. Based on this analysis, the pipelines examined have not exhibited any significant deterioration and should provide many more years of service.     

阻燃、抗静电硬质PVC涂敷管的研制

分析了阻燃、抗静电硬质PVC管材(简称PVC双抗管材)加入导电炭黑后变脆的原因,论述了涂敷阻燃、抗静电涂料生产PVC涂敷双抗管材的可行性,介绍了阻燃、抗静电涂料的制备及PVC涂敷双抗管材的物理性能.     

硬质PVC给水管材性能检测中应注意的问题

对PVC-U给水管材国家标准中的物理性能及力学性能项目的检测方法进行了分析,指出了在检测过程中应注意的问题,并提出了建议。     

LF108型PVC聚合釜的设计与制造

介绍了LF108型PVC聚合釜的结构特点及技术参数,总结了其制造及试运行过程中的注意事项及经验。     

煤矿中阻燃抗静电管道的重要性及阻燃抗静电PVC管材的应用

论述了我国煤矿中将阻燃抗静电管材用于抽放瓦斯、供水、排水的重要性,介绍了PVC管材在煤矿中使用的优点、应用情况及发展趋势。     

硬质PVC给水管材抽查中常见问题及对策

结合硬质PVC给水管材的实际检验工作,针对常见的项目不合格的原因进行分析探讨,并提出了建议和对策。     

“一出四”PVC穿线管内壁不平整的解决措施

通过改进螺杆、模具的结构,调整生产工艺,解决了"一出四"PVC穿线管生产初期出现的内壁不平整的问题。     

ESD在PVC聚合装置中的设计及应用

从多个方面阐述了在PVC聚合装置中设置ESD的必要性,介绍了ESD的设计方法及应用。     

纳米CaCO3在环保型聚氯乙烯管材中的应用

介绍了纳米CaCO3对PVC/ACR复合材料的增韧增强机理及在两种环保型材料(Ca/Zn稳定剂和食品级PVC树脂)配方体系中的加工应用情况。结果表明:与普通轻质CaCO3配方对比,添加纳米CaCO3配方体系生产的无毒PVC管材综合物理性能得到提高。     

有机锡参与合成P(BA-EHA)/PVC及共混改性PVC的结构与性能

通过种子乳液聚合方法,采用丙烯酸丁酯(BA)、丙烯酸2-乙基己酯(EHA)为核层单体,与少量有机锡单体共聚制备了含有机锡的P(BA-EHA)胶乳,与氯乙烯(VC)乳液接枝共聚合成了P(BA-EHA)/PVC复合改性剂。通过透射电子显微镜(TEM)、动态力学分析仪(DMA)、扫描电子显微镜(SEM)等测试手段,考察了复合乳胶粒子和共混材料的形态结构、复合改性剂中有机锡含量对其共混改性PVC材料的力学性能及复合粒子热稳定性的影响。DMA和TEM分析结果表明:复合粒子的加入显著改善了橡胶相与PVC之间的相容性,P(BA-EHA)在PVC基体中具有很好的分散性和均匀度,SEM照片显示共混材料缺口断面表现为优异的基体屈服型断裂韧性。     

硬质PVC发泡制品的配方设计

阐述了硬质PVC发泡制品配方中PVC树脂和热稳定剂、发泡剂、优泡剂、冲击改性剂、加工改性剂、填充剂、润滑剂及成核剂等助剂的选用原则,介绍了生产优质硬质PVC发泡制品的基础配方。     

松香改性丙烯酸酯乳液的合成及其在PVC地板胶的应用

采用半连续种子乳液聚合的方法制备了一种具有核壳结构的松香树脂改性PVC地板胶用丙烯酸酯聚合物乳液,讨论了松香树脂质量分数、松香树脂加入方式、核壳质量比等因素对聚合物乳液性能的影响。结果表明,当松香树脂质量分数为2%,核壳单体的质量比为1∶2时,乳液的初黏性(#33)达到1.3 cm,粘接强度达到0.32 MPa。