CN109517244A - 耐热型可扩容光纤复合低压电缆 - Google Patents
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Abstract
本发明公开一种耐热型可扩容光纤复合低压电缆,所述地线芯导体、3个动力线芯导体、控制线芯导体外表面包覆有绝缘层,所述光电单元外表面包覆有第一阻热护套层,所述预留光通道由抗拉绝缘层、包覆于抗拉绝缘层外表面的第二阻热护套层组成;所述第一阻热护套层、第二阻热护套层由以下组分组成:超高分子量聚乙烯树脂、低密度聚乙烯树脂、聚醚型TPU、聚对苯甲酰胺、环氧油酸丁酯、硬脂酸、硬脂酸钡、柠檬酸三丁酯、硅藻土、马来酸酐接枝PE、钙锌热稳定剂、抗氧化剂、氨丙基三乙氧基硅烷、硫代磷酸。本发明热塑性护套材料的老化试验温度达到158℃为168小时,材料热阻系数不小于6.0,提高了电缆耐油性能,能在100℃4天的耐油老化后,强度和断裂伸长率的保留率都在90%以上,同时电缆的扭曲性能能够达到U型弯曲2000万次以上。
Description
技术领域
本发明涉及光纤复合低压电缆技术领域,具体涉及一种耐热型可扩容光纤复合低压电缆。
背景技术
随着当今社会发展的需要,电缆作为单一功能已经不能满足居民的需求,随着社会信息化程度的不断提高,智能设备逐步走向民众家内,这就要求电缆不仅具有超强的输送电力能力,而且还要求辅以更多的信息化使命,虽然有的电缆带有复合功能,但由于其结构不合理,限制了相关功能的发挥,现有在低压电力电缆中增设耐热型光单元和扩容通道,利用光单元后敷设的光单元气吹方法进行光纤扩容,产品本身已在低压电力电缆中增设了耐热型光单元和预置了光通信管道,主要存在以下技术问题:
1、光纤复合低压电缆中的电单元(绝缘线芯)有着良好的物理机械性能,在各工序生产过程中不易对其电性能造成破坏性影响;而光单元中的光纤是复合缆中最薄弱的点。光单元的性能在生产过程中极易受到影响,如在光、电单元复合成缆过程中,复合缆的结构设计不合理、放线张力控制精度不够等原因,都可能造成光纤断裂或光纤传输性能不合格。
2、普通光单元中的光纤在受热超过85℃时,光纤衰减随着温度逐步提高明显增大,通过研发特种高热阻热塑性护套材料,有效延缓电力线芯对光单元和扩容通道的热量传导,延长温升时间通过用电波峰期,降低光单元和扩容光单元的光纤传输衰减值;另外该特种材料采用热塑性,有效减少光单元在生产过程中由于交联问题而引起的各种问题。
3、普通的光缆气吹敷设均是水平敷设,通过机械推进器及空气压缩机气流输送,仅仅是将微缆水平吹入专用预设管道。然而对于这种可扩容的光纤复合缆而言,施工、敷设时电缆往往不能水平放置,会面临穿管、转弯、悬垂等各种情况,有时甚至是要求敷设前在盘具上直接气吹敷设。电缆在电缆盘上完成气吹,整个气吹敷设过程,光单元受到的阻力更大,行进的方向、位置都无规则性。传统的气吹方式无法满足光单元后敷设光纤复合电缆的要求,所以可扩容光纤复合电缆的主要问题就是解决光单元在大阻力、不规则、长距离条件下如何解决光单元的扩容气吹敷设问题,对于扩容气吹敷设的要求也大大提高。关键技术主要从光通信管道的尺寸及加强结构优化、空气压缩机的气压控制、气吹方式等几个方面入手解决产品的扩容气吹敷设问题。
发明内容
本发明的目的是提供一种耐热型可扩容光纤复合低压电缆,其提高了复合缆光单元护套的耐温等级和延缓温度传导时间,挤包在光单元外作为护层,热塑性护套材料的老化试验温度达到158℃为168小时,能在100℃4天的耐油老化后,强度和断裂伸长率的保留率都在90%以上,同时电缆的扭曲性能能够达到U型弯曲2000万次以上。
为达到上述目的,本发明采用的技术方案是:一种耐热型可扩容光纤复合低压电缆,所述可扩容光纤复合低压电缆包括光电单元、至少1个地线芯导体、3个动力线芯导体、控制线芯导体以及预留光通道;
所述地线芯导体、3个动力线芯导体、控制线芯导体外表面包覆有绝缘层,所述光电单元外表面包覆有第一阻热护套层,所述预留光通道由抗拉绝缘层、包覆于抗拉绝缘层外表面的第二阻热护套层组成;
一包带层包覆于所述可扩容光纤复合低压电缆包括光电单元、至少1个地线芯导体、3个动力线芯导体、控制线芯导体以及预留光通道外表面,一外护套层包覆于包带层外表面;
所述第一阻热护套层、第二阻热护套层由以下组分组成:
超高分子量聚乙烯树脂 100份,
低密度聚乙烯树脂 20~35份,
聚醚型TPU 10~15份,
聚对苯甲酰胺 20~30份,
环氧油酸丁酯 18~25份,
硬脂酸 15~25份,
硬脂酸钡 10~15份,
柠檬酸三丁酯 8~12份,
硅藻土 6~10份,
马来酸酐接枝PE 5~10份,
钙锌热稳定剂 4~8份,
抗氧化剂 2~3份,
氨丙基三乙氧基硅烷 5~8份,
硫代磷酸 1~3份。
上述技术方案进一步改进的技术方案如下:
1. 上述方案中,所述抗氧化剂为抗氧化剂1010、抗氧剂DLTP和抗氧剂DSTP中的至少一种。
2. 上述方案中,所述包带层与光电单元、至少1个地线芯导体、3个动力线芯导体、控制线芯导体以及预留光通道之间设置有若干根填充条。
由于上述技术方案的运用,本发明与现有技术相比具有下列优点:
1. 本发明新型耐热型可扩容光纤复合低压电缆,其采用超高分子量聚乙烯树脂100份、低密度聚乙烯树脂20~35份、聚对苯甲酰胺20~30份、硅藻土6~10份,提高了复合缆光单元护套的耐温等级和延缓温度传导时间,挤包在光单元外作为护层,热塑性护套材料的老化试验温度达到158℃为168小时,材料热阻系数不小于6.0,满足电力电缆在超过最高工作10%的环境下光纤的衰减不大于0.15db;其次,其基于超高分子量聚乙烯树脂100份、低密度聚乙烯树脂20~35份、聚对苯甲酰胺20~30份、硅藻土6~10份进一步添加柠檬酸三丁酯8~12份、氨丙基三乙氧基硅烷5~8份,热塑性护套材料的老化试验温度达到158℃下,抗张强度变化率和断裂伸长率变化率均不大于±20%。
2. 本发明新型耐热型可扩容光纤复合低压电缆,其进一步添加聚醚型TPU10~15份、硫代磷酸1~3份,提高了电缆耐油性能,能在100℃4天的耐油老化后,强度和断裂伸长率的保留率都在90%以上,同时电缆的扭曲性能能够达到U型弯曲2000万次以上,选择180℃扭曲弯曲1000万次以上。
附图说明
附图1为本发明耐热型可扩容光纤复合低压电缆结构示意图。
以上附图中:1、光电单元;2、地线芯导体;3、动力线芯导体;4、控制线芯导体;5、预留光通道;6、绝缘层;7、第一阻热护套层;8、抗拉绝缘层;9、第二阻热护套层;10、包带层;11、外护套层;12、填充条。
具体实施方式
实施例1~4:一种耐热型可扩容光纤复合低压电缆,所述可扩容光纤复合低压电缆包括光电单元1、至少1个地线芯导体2、3个动力线芯导体3、控制线芯导体4以及预留光通道5;
所述地线芯导体2、3个动力线芯导体3、控制线芯导体4外表面包覆有绝缘层6,所述光电单元1外表面包覆有第一阻热护套层7,所述预留光通道5由抗拉绝缘层8、包覆于抗拉绝缘层8外表面的第二阻热护套层9组成;
一包带层10包覆于所述可扩容光纤复合低压电缆包括光电单元1、至少1个地线芯导体2、3个动力线芯导体3、控制线芯导体4以及预留光通道5外表面,一外护套层11包覆于包带层10外表面;
所述第一阻热护套层7、第二阻热护套层9由以下组分组成:
表1
所述第一阻热护套层7、第二阻热护套层9通过以下步骤获得:
步骤一、将超高分子量聚乙烯树脂100份、低密度聚乙烯树脂20~35份、聚醚型TPU10~15份、聚对苯甲酰胺20~30份、环氧油酸丁酯18~25份、硬脂酸15~25份、硬脂酸钡10~15份加入高速混合机中,在95-105℃下以500-800rpm 的速度搅拌混合20-30min,然后将柠檬酸三丁酯8~12份、硅藻土6~10份、马来酸酐接枝PE5~10份投入螺杆双挤出机中,再加入EVA,挤出机熔融段温度控制在140-175℃,在400-600r/min 的转速下熔融共混10-20min,然后挤出造粒,即得改性EVA 颗粒;
步骤二、将HDPE、EPDM、相容剂与上述制得的改性EVA 颗粒加入到混炼机上混炼10-20min,温度为105-110℃,得到混炼胶;
步骤三、将上述制得的混炼胶与钙锌热稳定剂4~8份、抗氧化剂2~3份、氨丙基三乙氧基硅烷5~8份、硫代磷酸1~3份投入密炼机中,混炼2-3min后,密炼机转速150-200r/min, 温度控制在90-105℃;
步骤四、将密炼后得到的混和料经双锥剪切输送入螺杆挤出机挤出加工,挤出时的机身温度为140±10℃,机头温度为110±10℃,挤出后在平板硫化机上进行硫化,在160-180℃下热压8-10min,常温冷压4-6min,硫化压力6-10MPa,出线速度为12-15m/min,从而获得第一阻热护套层7、第二阻热护套层9的电缆料。
上述抗氧化剂为抗氧化剂1010、抗氧剂DLTP和抗氧剂DSTP中的至少一种。
上述包带层10与光电单元1、至少1个地线芯导体2、3个动力线芯导体3、控制线芯导体4以及预留光通道5之间设置有若干根填充条12。
本实例制备的阻热护套层材料,性能的检测数据如下:
表2光纤复合低压电缆的阻热护套层性能指标
采用上述耐热型可扩容光纤复合低压电缆时,其采用超高分子量聚乙烯树脂100份、低密度聚乙烯树脂20~35份、聚对苯甲酰胺20~30份、硅藻土6~10份,提高了复合缆光单元护套的耐温等级和延缓温度传导时间,挤包在光单元外作为护层,热塑性护套材料的老化试验温度达到158℃为168小时,材料热阻系数不小于6.0,满足电力电缆在超过最高工作10%的环境下光纤的衰减不大于0.15db;其次,其基于超高分子量聚乙烯树脂100份、低密度聚乙烯树脂20~35份、聚对苯甲酰胺20~30份、硅藻土6~10份进一步添加柠檬酸三丁酯8~12份、氨丙基三乙氧基硅烷5~8份,热塑性护套材料的老化试验温度达到158℃下,抗张强度变化率和断裂伸长率变化率均不大于±20%;再次,其进一步添加聚醚型TPU10~15份、硫代磷酸1~3份,提高了电缆耐油性能,能在100℃4天的耐油老化后,强度和断裂伸长率的保留率都在90%以上,同时电缆的扭曲性能能够达到U型弯曲2000万次以上,选择180℃扭曲弯曲1000万次以上。
上述实施例只为说明本发明的技术构思及特点,其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施,并不能以此限制本发明的保护范围。凡根据本发明精神实质所作的等效变化或修饰,都应涵盖在本发明的保护范围之内。
Claims (3)
1.一种耐热型可扩容光纤复合低压电缆,其特征在于:所述可扩容光纤复合低压电缆包括光电单元(1)、至少1个地线芯导体(2)、3个动力线芯导体(3)、控制线芯导体(4)以及预留光通道(5);
所述地线芯导体(2)、3个动力线芯导体(3)、控制线芯导体(4)外表面包覆有绝缘层(6),所述光电单元(1)外表面包覆有第一阻热护套层(7),所述预留光通道(5)由抗拉绝缘层(8)、包覆于抗拉绝缘层(8)外表面的第二阻热护套层(9)组成;
一包带层(10)包覆于所述可扩容光纤复合低压电缆包括光电单元(1)、至少1个地线芯导体(2)、3个动力线芯导体(3)、控制线芯导体(4)以及预留光通道(5)外表面,一外护套层(11)包覆于包带层(10)外表面;
所述第一阻热护套层(7)、第二阻热护套层(9)由以下组分组成:
超高分子量聚乙烯树脂 100份,
低密度聚乙烯树脂 20~35份,
聚醚型TPU 10~15份,
聚对苯甲酰胺 20~30份,
环氧油酸丁酯 18~25份,
硬脂酸 15~25份,
硬脂酸钡 10~15份,
柠檬酸三丁酯 8~12份,
硅藻土 6~10份,
马来酸酐接枝PE 5~10份,
钙锌热稳定剂 4~8份,
抗氧化剂 2~3份,
氨丙基三乙氧基硅烷 5~8份,
硫代磷酸 1~3份。
2.根据权利要求1所述的耐热型可扩容光纤复合低压电缆,其特征在于:所述抗氧化剂为抗氧化剂1010、抗氧剂DLTP和抗氧剂DSTP中的至少一种。
3.根据权利要求1所述的耐热型可扩容光纤复合低压电缆,其特征在于:所述包带层(10)与光电单元(1)、至少1个地线芯导体(2)、3个动力线芯导体(3)、控制线芯导体(4)以及预留光通道(5)之间设置有若干根填充条(12)。
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