CPVC耐热管材配方的设计与应用

采用Brabender方法和辊压色相评价方法，对CPVC物料的动态密炼实验及黄度指数测定的研究指出，稳定体系及抗冲击改性剂的选用是CPVC耐热管材配方设计的关键因素，并通过正交法确定出价格性能比较好的稳定体系最佳配比及抗冲击改性剂的用量。实验结果表明：复合钙锌稳定剂、环氧大豆油、TPP（亚磷酸酯）对硫醇锑具有较好的协同增效作用。     

氯化聚氯乙烯导热管的研制

本文研究了适用于单螺杆挤出的氯化聚氯乙烯(CPVC)导热管的配方和工艺条件。实验结果表明:几种稳定剂并用作为CPVC的稳定体系,效果较好;ACR对CPVC复合物的胶凝化有明显的促进作用,能有效地改善CPVC的加工性能;石墨粉能显著地提高CPVC的导热性能,但会因此降低冲击性能。因此使用石墨粉时必须添加抗冲改性剂以改善冲击性能,同时兼顾其他力学性能和使用要求。     

Lightweight,Elastomeric, and Flame‐Retardant Foams from Expanded Chlorinated Polymers

Intrinsically flame‐retardant polymers based on lightweight and elastomeric microcellular foams are successfully prepared from flexible chlorinated polyethylene (CPE)/chlorinated polyvinylchloride (CPVC) compounds through compression molding foaming technology. The incorporation of CPVC to CPE at once improves the foam characteristics, and enhances the mechanical and fire performances. Due to the plausible intermolecular and intramolecular crosslinking among the polymer chains, the dense network structure of CPE/CPVC with enhanced strength results in increased cell size, reduced cell density, and improved dimensional stability of CPE/CPVC foams (CCFs). These improvements are noticed to be enhanced with increasing CPVC content in the CCF. Also, the flame‐retardant properties of the foams (i.e., limiting oxygen index and cone calorimeter combustion) are found to be increased with the increase of CPVC content. For instance, a highly flame‐retardant CCF at CPE/CPVC ratio of 60/40 shows a shorter combustion period, as derived from the respective heat release rate vs time curve. Corresponding peaks of heat release rate, total heat release rate, peak of mass loss rate, total smoke release, and char residue are recorded to be 8.4%, 5.8%, 3.0%, 6.6%, and 1000.1% of those recorded for the pristine CPE foam.     

CPVC/PMMA共混体系的性能研究

制备了氯化聚氯乙烯/聚甲基丙烯酸甲酯(CPVC/PMMA)共混材料,研究了PMMA的引入对CPVC/PMMA共混体系的力学性能、耐热性能、表面光泽度、加工流动性和微观结构的影响。结果表明:适量PMMA的引人,使CPVC/PMMA共混体系的缺口冲击强度和光泽度较纯CPVC显著提高,耐热性能亦有所改善,而拉伸强度下降不明显;塑炼过程中,CPVC/PMMA共混体系熔体的平衡扭矩降低,凝胶化时间减少。当PMMA含量为15 phr时,CPVC/PMMA共混体系具有最佳综合性能,此时该共混体系的缺口冲击强度为5.4 kJ/m2,拉伸强度为53.5 MPa,表面光泽度为82.3%,热变形温度为102.4℃,平衡扭矩为20.1 N·m。     

氯化聚氯乙烯的高性能化研究

以苯乙烯(St)和丙烯酸丁酯(BA)单体对氯化聚氯乙烯(CPVC)进行力化学改性.研究及分析了苯乙烯、丙烯酸丁酯单体及增韧剂的加入量对CPVC流变性能、力学性能及耐热性能的影响.实验结果表明:力化学改性CPVC是一种简单、有效的方法.经红外光谱测试证明,通过力化学方法可以制备CPVC-g-St及CPVC-g-BA共聚物.改性后的CPVC的加工性能和冲击强度均有明显提高,且保持了其良好的耐热性.     

PVC/CPVC合金的性能研究

研究了PVC/CPVC合金的流变性能、力学性能、微观结构和热稳定性,实验表明:随着CPVC含量的增多,PVC/CPVC二元合金体系的最大强度、断裂强度、100%定伸强度、定荷伸长、热变形温度等均呈递增趋势;但断裂伸长率下降幅度较大。试样断面的SEM照片能较好地解释冲击性能的测试结果,也证明了材料的微观结构对材料的力学性能有着内在影响。在热稳定性实验研究中,DSC和热重法(TG)研究的结果显示CPVC有助于提高PVC的热稳定性。     

纳米SiO2和ABS改性CPVC材料

采用融熔共混的方法制备出CPVC/SiO2和CPVC/ABS/SiO2两种复合体系,研究复合体系的力学性能、耐热性,并进行了微观结构分析以及动态力学分析,考察纳米SiO2以及ABS对体系各项性能的影响.结果表明:适量的纳米SiO2可以提高体系力学性能及耐热性;ABS的加入有效的提高了体系的抗冲击强度,并使体系的玻璃化转变温度向高温方向移动,耐热性进一步得到改善.     

ACR改性CPVC凝胶化测试及力学性能的研究

采用差示扫描量热法(DSC)和HAAKE流变仪研究了不同用量的抗冲型丙烯酸酯橡胶(ACR)改性氯化聚氯乙烯(CPVC)的凝胶化性能及流变性能,综合力学件能、耐热性能、微观形貌对ACR改性CPVC进行系统研究.结果表明,ACR的加入能极大地提高CPVC的凝胶化度,促进塑化,改善CPVC加工性能,ACR用量6～9份为宜,对CPVC的增韧效果较好.     

抗冲击改性剂ACR对CPVC性能的影响

研究了抗冲击改性剂ACR对氯化聚氯乙烯(CPVC)力学性能、耐热性能、微观结构及加工性能的影响。结果表明:随着ACR的加入,CPVC的韧性增强,刚性降低,同时改善了体系的加工性能。     

消防用耐压、防火、消烟型CPVC管道的研制

本文介绍了消防用CPVC管道的研制,并介绍了CPVC管道的在耐压、防火、消烟方面的优势。     

Effects of postchlorination on key product and processing properties of PVC

The behavior of PVC resins has been shown to change dramatically when postchlorinated from 57 to 70 percent chlorine. Many of these changes are beneficial: heat resistance, thermoformability, and combustion properties are improved to an extent that opens new market opportunities for properly formulated chlorinated PVC (CPVC) materials. Sharply increasing melt viscosity also results from increasing chlorine content, creating the need for compounding and processing expertise differing from that for rigid PVC. The fact that such expertise has been developed, and is constantly being improved, is expanding the use of CPVC.     

PVC-C/PVC共混材料的性能研究

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。     

CPVC对PVC性能的影响

研究了在PVC中添加不同量的CPVC共混体系的加工性能、耐热性能、力学性能。实验结果表明:随着CPVC含量的增加,共混体系的加工性能变的较为困难,但拉伸强度和维卡软化点温度有明显提高,缺口冲击强度和断裂伸长率有所下降。当CPVC用量为20份时,是实际生产及实际应用的一个较为理想的比例。     

高性能氯化聚氯乙烯研究进展

简述了国内外氯化聚氯乙烯(CPVC)研究进展。介绍了笔者在CPVC合成与改性研究方面的部分成果,包括CPVC合成新工艺的开发、新型CPVC改性树脂的开发及有机硅-丙烯酸酯弹性体增韧CPVC的研究。     

CPVC/PVC共混物性能研究

采用CPVC与PVC共混,研究共混物的力学性能和耐热性,并考察纳米CaCO3对其性能的影响.结果表明:随着CPVC含量的增加,共混物的拉伸强度、弯曲强度和耐热性能都有明显的提高,冲击强度则先增后减;随着CaCO3含量增加,共混物的冲击强度和耐热性能都逐渐提高,但拉伸强度和弯曲强度则呈下降趋势.     

The diffusion of chloroform and carbon tetrachloride from rigid PVC pipe and rigid CPVC pipe into water

The objective ofthis study was to determine whether or not chloroform (CHCl₃) and carbon tetrachloride (CCl₄) diffuse from poly(vinyl chloride) (PVC) or chlorinated poly(vinyl chloride) (CPVC) pipe into water in the absence of solvent cement. Milli Q water (water which has been deionized, demineralized, and purified of residual organic matter) and tap water were permitted to stand in specimens of recently extruded pipe for 14 days in an attempt to simulate a condition of prolonged stagnation. The CHCl₃ and CCl₄ in the water were then measured utilizing an analytical method sensitive to 0.01 μg/1 (ppb). CHCl₃ and CCl₄ do not diffuse from Geon PVC or TempRite CPVC pipe or fitting compounds in significant quantities under these test conditions. Where sporadic positive responses were noted, these were in the low or fractional μg/1 (ppb) ranges and are far lower than levels commonly found in chlorinated tap water. The low, sporadic values obtained for CHCl₃ and CCl₄ in both Milli Q and tap water do not permit the calculation of meaningful diffusion constants.     

Upper critical solution temperature lubricants for CPVC

Chlorinated polyvinyl chloride (CPVC) is often used in injection molding for products that demand high heat resistance. However, proper control of its flow properties is difficult. To improve flow behavior some internal lubricants are usually used, but they reduce heat resistance of the products. Upper critical solution temperature (UCST) lubricants were found to enhance its flow properties, and also high heat resistance was retained. They act as internal lubricants during processing, improving flow and phase separation during cooling. Therefore they are present essentially as inert filler and thus have little effect on heat distortion temperature.     

国产CPVC树脂和进口树脂性能的对比分析

选取国内外同类型的典型的CPVC树脂进行结构表征及性能测试,探讨树脂存在的差距.利用扫描电子显微镜/X射线能谱仪(SEM/EDS)、同步热分析仪(DSC/TG)对两种树脂进行全面的表征和比较.结果表明:国产树脂与进口树脂存在一定的差距,国产CPVC粒子皮膜连续且厚实;加工温度范围窄,塑炼易变色,热稳定性差,需要从提高PVC质量、改进氯化工艺以及加强PVC,CPVC表征分析等方面着手,加快研发速度,逐步改观我国CPVC技术落后,产品质量差的现状.     

Single phase polymer systems: CPVC/styrene copolymer alloys

Random copolymers of styrene and maleic anhydride are miscible with chlorinated poly(vinyl chloride) [CPVC] in all blended proportions. Miscibility was evident in a single glass transition temperature investigated by thermal and mechanical studies. This degree of miscibility differs from the partial miscibility obtained with PVC/styrene copolymers reported previously, where single phase morphology was present only at low blend proportions. Tailoring of physical properties such as heat resistance, flamability resistance, and processability are achieved by varying the relative proportions of CPVC and styrenic copolymer in this miscible alloy system.     

CPVC工业管道系统在电镀工业中的应用

氯化聚氯乙烯是加工行业管道系统的理想选择。与其他材料比较,CPVC有其卓越的性能;优异的均衡性,耐蚀性、良好的机械性能及较高的性能价格比,CPVC管道系统包括管道、管件、阀门及板材。安装简单,只需用胶水粘接。CPVC可用于电镀、金属处理、纸浆、化学工业、工业废物处理和食品及饮料工业等。同时比较了CPVC与聚丙烯的性能和化学阻抗数据。