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This paper introduces the development and the characteristics of self—limiting beater cable which is mainly composed of crystalline thermplastic polymer and conductive carbon black and the resistivity of which is characterized by a positive temperature coefficient. There are two specifications, whose calorific temperatures are about 70℃ and 90℃ respectively. They may be used in heat tracing pipes, valves and pumps in oil fields and chemical plants for freeze protection or maintaining flow characteristics of...

This paper introduces the development and the characteristics of self—limiting beater cable which is mainly composed of crystalline thermplastic polymer and conductive carbon black and the resistivity of which is characterized by a positive temperature coefficient. There are two specifications, whose calorific temperatures are about 70℃ and 90℃ respectively. They may be used in heat tracing pipes, valves and pumps in oil fields and chemical plants for freeze protection or maintaining flow characteristics of viscous syrups. After electrified operation the development samples have been stable for over half a year.

本文介绍了自限式电热带的研制方法及其特性。以晶态热塑性聚合物和导电碳黑为主体的自限式电热带,其电阻率具有正温度系数特性,发热温度范围从70℃至90℃,分为两种规格。根据需要,适用于油田、化工等行业的管道、阀门、泵体等不同场合,起防冻保温作用,保持粘滞液体流通无阻。研制样品通电试验半年多来,性能稳定。

Taking LLDPE and EVA as basic materials,furnace black (CB) as conductible aid,the positive temperature coefficient (PTC) effect and resistance stability of thermoplastic semi crystalline polymer/CB compound were studied in this paper.The results showed the use of DCP could improve the PTC stability and PTC transition temperature of the compound,the effect being most obvious when the DCP content was 1% by mass percent.CB grafting could improve...

Taking LLDPE and EVA as basic materials,furnace black (CB) as conductible aid,the positive temperature coefficient (PTC) effect and resistance stability of thermoplastic semi crystalline polymer/CB compound were studied in this paper.The results showed the use of DCP could improve the PTC stability and PTC transition temperature of the compound,the effect being most obvious when the DCP content was 1% by mass percent.CB grafting could improve the PTC of the compound,better than by radiation,making the PTC strength 10 times increased at least.Among polar polymer A,non polar polymer B and polar material C,grafts dealed in the study,the PTC characters of A/PE/CB and C/PE/CB were obvious,the temperature corresponding to the peak resistivity of B/PE/CB was 6~15℃ lower than that of A/PE/CB.The results of condition cycling test under 220V and 50Hz for 6 000h showed the working temperature of LLDPE/EVA/A g CB kept stable at 65±5℃,its resistivity change R f/ R i was larger than 2,power change P f/ P i was about 1,while the calorific temperature of LLDPE/EVA/CB decreased quickly,decreased from 85℃ to 50℃ within 720h,kept stale only at 30℃,and its resistivity increased more than 30 times,calorific power decreased from 18W/m to 6W/m

以线性低密度聚乙烯(LLDPE)和乙烯-醋酸乙烯共聚物(EVA)为基体,油炉法炭黑(CB)为导电性赋与剂,探讨了热塑性半结晶性高聚物/炭黑复合体系的PTC(正温度系数)效应及其电阻稳定性。结果表明,过氧化物交联剂(DCP)可提高体系的PTC性能稳定性和PTC的转变温度,当用量为1%质量分数时,影响最为明显。炭黑接枝能提高体系的PCT特性,比辐射更有效,使PTC强度至少可提高10倍。在所研究的极性高聚物A、非极性高聚物B和极性物C三种接枝物中,以A/PE/CB和C/PE/CB体系的PTC特性明显,B/PE/CB体系峰值电阻率对应的温度低于A/PE/CB约6~15℃。在工作电压下通断电循环试验表明,LLDPE/EVA/A-g-CB体系在6000h的通电过程中,工作温度基本稳定在65±5℃,通、断电循环试验的电阻率变化Rf/Ri大于2,功率变化Pf/Pi在1左右,而LLDPE/EVA/CB体系的发热温度下降很快,仅在720h内就由85℃下降到50℃,直到30℃才趋稳定,其电阻率增加30倍以上,发热功率由18W/m下降到6W/m。

When the electrothermal layer of carbon fiber reinforced concrete (CFRC) is bonded with the ordinary concrete layer, thermal stress may bright out. The analytic model of the thermal stress is made on a certain size of CFRC layer with different heating temperatures, and finite element method is used to calculate the octahedral shear stress. The result shows that the higher heating temperature has the larger danger of breakage.

当碳纤维水泥基复合材料(CFRC)电热层与混凝土层固定在一起并且通电使之发热时,电热层的热膨胀受到限制将会产生热应力。本文首先建立了一定尺寸的CFRC电热层的热应力分析模型,采用有限元方法研究了不同的发热温度时CFRC的八面体剪应力,得出当发热温度较高时电热层的破坏危险性较大。

 
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