聚乙烯白色护套料的耐久性研究

将超高分子量聚乙烯与双峰聚乙烯以7:3的质量比进行共混改性,并加入1.5份钛白粉、0.5份抗氧剂和0.5份光稳定剂,制得耐紫外线辐照性能、耐热老化性能和耐环境应力开裂性能优异的护套料。该护套料试样在强紫外线辐照1000h后,其断裂伸长率保留率仍在50%以上,耐环境应力开裂时间大于1500h。通过扫描电子显微镜和衰减全反射-傅立叶变换红外光谱仪研究了试样表面的微观结构与化学结构的变化,发现其老化过程复杂,自制的护套料有较好的耐久性。     

新型HDPE通信光(电)缆护套料的研制

通过对基础树脂,改性树脂的选择,进行了新型ＨＤＰＥ通信光（电）缆护套料的配方设计,并探讨了成核剂,熔体粘度调节剂等对护套料性能的影响,结果表明：成核剂的加入可使ＨＤＰＥ护套料的密度提高,熔点降低,加入熔体粘度调节剂则可使护套料的低温脆性、低温伸长率、断裂伸长率提高。新研制的ＨＤＰＥ护套料加工温度低,加工温度范围宽,既可用于通信电缆也可用于光缆外层护套材料。     

电线电缆用HDPE护套料的研制

采用共混改性的方法,研制了电线电缆用高密度聚乙烯(HDPE)护套料,其配方:HDPE TR144为70.0 phr,HDPE 6084为30.0 phr,高耐磨炭黑为2.7 phr,抗氧剂为0.8 phr,润滑剂为0.7 phr。该护套料的绝缘电阻率为3.48×10~(14)Ω·m,耐环境应力开裂大于500 h,耐气候老化时间4 000 h时;材料的断裂伸长变化率为5%。     

黑色聚乙烯通讯电缆护套料试制

本文主要介绍了黑色聚乙烯耐环境应力开裂通讯电缆护套料配方中各组分的选用，生产工艺及性能等。     

阻燃性LDPE电缆料的研制

以LDPE为基料,选择适宜的阻燃剂体系、抗铜害老化剂和耐环境应力开裂改进剂,制得阻燃LOPE电缆绝缘料和护套料。     

化学交联改性黑色LDPE光缆护套料的性能研究

本文研究了化学交联改性黑色ＬＤＰＥ光缆护套料的性能，并将其与国产ＥＶＡ共混ＬＤＰＥ光缆护套料及进口ＬＤＰＥ－ＥＶＡ共聚光缆护套料进行了比较，结果表明，化学交联改性光缆护套料的力学、耐热、耐油、耐环境应力开裂等性能都有显著提高，其综合技术指标超出国内ＳＧ２４３一幻及美国ＲＥＡ－ＰＥ—２００标准，满足光缆护套料的使用要求。     

高性能LLDPE电缆护套的研制

采用扬子石化公司生产的LLDPEX基体树脂制备通信电缆用黑色LLDPE电缆护套料,研究了电缆护套料各组分选择、用量和加工工艺对其性能的影响,给出了成型电缆护套的工艺条件。结果表明,该电缆护套料的配方合理、加工工艺可行,性能达到了国家标准要求,尤其是拉伸强度、断裂伸长率、耐环境应力开裂等性能优异。该电缆护套料的加工性能可满足生产通信电缆外层护套的要求,生产的护套的各项指标均达到邮电部标准要求。     

阻燃LDPE电缆料的研制

以ＬＤＰＥ为基料，选择适宜的阻燃剂体系，抗铜害老化剂和耐环境应力开裂改进剂、制得阻燃ＬＤＰＥ电缆绝缘料和护套料。     

ADSS光缆电腐蚀模拟实验与改进对策

全介质自乘式(ADSS)光缆使用特殊性质绝缘材料,并且逐渐成为主要光缆类型。在ADSS应用过程中会出现电腐蚀的情况,以对电腐蚀问题进行预防和解决,针对导致电腐蚀的因素进行分析,研究了ADSS光缆电腐蚀的问题,通过模拟正常到极端高电压环境进行现场运行试验,发现了与电晕放电和干带电弧放电不同的电腐蚀原因,并提出了相应的对策,通过试验验证了防范措施的有效性,可使ADSS光缆断缆故障频率得到降低。     

LDPE电缆护套料耐环境应力开裂性的改进

聚乙烯电缆护套料的重要性能之一是耐环境应力开裂(ESCR)性能,普通的LDPE树脂不能满足要求。本文在研究PE分子量及其分布、分子链结构以及PE与其它高聚物的共混物形态结构对ESCR影响的基础上,指出采用EVA作共混改性剂的可行性;并重点研究了不同EVA中的VA含量对共聚物的ESCR以及熔体指数、屈服强度、断裂强度、伸长率和电性能等的影响。     

热挤HDPE护套在桥梁缆索防护中的应用

选择热挤高密度聚乙烯(HDPE)护套对桥梁缆索索体进行防腐保护,介绍热挤HDPE护套的成型工艺及性能。结合工程实践,探讨热挤HDPE护套的成型缺陷及应用中的变色、老化和龟裂、破坏和修补、质量检验等问题,并提出了相应的解决措施。     

Coated metals compatible with PVC jackets for bonded sheath cable applications

Mechanical strength in the cable sheath is particularly valuable for both fiber optical and copper pair cable. By bonding a PVC jacket to a coated metal tape, a mechanically strong sheath construction is obtained. Changes in PVC jacket technologies have created the need for PVC compatible coated metals with greater tolerance for variations in PVC jacketing materials. This need has been met by the development of a variety of coated metals having thermoplastic coatings which adhere to PVC. As a consequence of this development, new cable sheath designs for use in a variety of applications, such as riser cable and direct buried cable destined for local area networks, are possible. These cables may utilize both copper conductors and/or optical fibers for signal transmission. Data will be provided in the paper to show the effects of extrusion process conditions on adhesion for a variety of PVC resins. The properties of a variety of coated metals—aluminum, copper, and steel—will be discussed. Data on environmental tests of adhesion will be presented. Relationships between adhesion, metal characteristics, jacket properties, and mechanical performance of the sheath will be discussed. Cable applications for the PVC compatible metals will be discussed. Data on the performance of the bonded sheath in riser cable and buried local area network cable will be presented. New cable applications where coated metals in the sheath can provide lightweight armoring will also be discussed.     

低烟无卤阻燃电缆护套用乙烯－丙烯酸酯弹性体胶料

以乙烯－丙烯酸酯弹性体为主体材料，用过氧化物硫化，填充氢氧化铝。硅烷偶联剂处理的锻烧陶土、ＬＥＥ白滑粉及超细滑石粉等，制成了低烟无卤阻燃电缆护套用胶料，其成品电缆的技术指标可以满足ＧＢ９３３１，ＧＢ１２６６６，ＩＥＣ５０２（１９９４）等标准的要求。     

Study of the electrical properties of flame retardant poly(vinylchloride) using positron annihilation lifetime spectroscopy

Since the large fire at the Brown Ferry cable plant which occurred at noon on March 22, 1975 in Alabama, attention has been given to the use of flame retardant cable in buildings to meet fire safety requirements. Flame retardants are used in wire and cable applications to prevent the conversion of an electric spark into fire and subsequently to prevent the spread of fire throughout a structure along the wiring. There are many substances used as flame retardants in wires and cables. In Egypt, Multi‐Purpose Reactor insulation and jacket cables have been constructed from a flame retardant substance, poly(vinylchloride) (PVC). In the present work, elemental and X‐ray fluorescence analyses have been performed to determine the composition of PVC in the jacket cable samples. In addition, the conductivity (σ), permittivity (?′), and dielectric loss (?″) as well as positron annihilation lifetime (PAL) are measured in the temperature range 30 to 140 °C. It is found that the amount of chlorine in the flame‐retardant PVC (FRPVC) jacket cable is significantly higher (5%) than the conventional PVC jacket cable. Inverse relationships between σ and free volume size and fractions (V, f) through the temperature range are obtained. However, a distinct positive relationship between σ and I₂ above 100°C is found. The results of PAL and electrical measurements indicate that FRPVC has good electrical insulation properties below 100°C. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 638–644, 2005     

基于分布式布里渊光纤散射传感的海底动力电缆监测技术研究

针对海底动力电缆出现故障而寻找电缆监测的技术与方法,分析渤海湾不稳定海域的海底动力电缆多次出现短路和断路故障的原因与机理,提出基于布里渊散射原理的分布式光纤传感技术监测电缆所受外力变化和监测电缆内部温度变化的方案和方法,进行三相高压电缆截面温度场和电缆外部受力变形的数值模拟分析,通过室内模拟实验和海堤沉降段电缆敷设后的光纤传感监测数据及水准仪观测监测数据对比分析,得出光纤传感器检测数据趋势与水准仪器测量结果吻合。模拟和现场测试结果表明,基于光纤布里渊散射原理的分布式光纤传感技术可有效实现海底动力电缆的温度和变形监测。     

海洋石油平台用电线电缆护套料的开发应用

探讨了在海洋石油平台用电线电缆护套料的开发过程中，ＣＳＭ－４５／Ｎｏｒｄｅｌ２７２２并用比、硫化体系、氢氧化铝，无机填料以及填料表面处理剂对阻燃电缆料性能的影响。提出了硫化体系、阻燃剂、填料以及填料表面处理剂的选择原则。经计算机辅助设计（ＣＡＤ）技术分析，并经实验及实践证实：氢氧化铝用量不宜超过６０质量份，填料表面处理剂宜采用硬脂酸锌。由此配合而研制开发出的产品性能满足ＩＥＣ－５０２（１９９４）的要求，电缆料具有良好的可加工性，也具有一定的经济和社会效益。     

Development of a flame-resistant noncontaminating PVC jacket for coaxial cable

The migration of plasticizer from a PVC jacket into the polyethylene core of a coaxial cable can significantly alter the high-frequency transmission characteristics of the cable by effectively increasing the dissipation factor of the polyethylene. In order to determine the effect of plasticizer type on transmission loss, a series of PVC-jacketed polyethylene core coaxial cables was manufactured, each jacket with a different plasticizer. Transmission loss was found to be directly related to plasticizer volatility. A linear trimellitate plasticizer gave stable electrical performance with a good balance of properties, including processing, cost, and fire resistance.     

配方优化设计的计算机辅助设计技术

在胶料配方正交试验设计、分析、优化过程中，采用计算机辅助设计技术求解了线性回归方程，各项性能的平均值，中间值，数据信息处理，配方优化的Ｃ程序设计技巧以及实用的Ｃ程序。以无卤低烟阻燃电缆护套胶料配方设计为例，验证了程序的实用性。表明该程序实用性强，准确度高，速度快，整个运行过程仅需１０ｍｉｎ左右。     

聚氨酯弹性体在线缆护套材料中的应用

本文论述了聚氨酯线缆护套材料的配合工艺和优异性能及其影响因素。阐明了这种新型材料是用于特种线缆和光缆护套的理想材料。