Article(id=1192878363770499315, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1192878363166523716, articleNumber=null, orderNo=null, doi=10.16790/j.cnki.1009-9239.im.2025.01.006, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1709481600000, receivedDateStr=2024-03-04, revisedDate=1713974400000, revisedDateStr=2024-04-25, acceptedDate=null, acceptedDateStr=null, onlineDate=1762333964531, onlineDateStr=2025-11-05, pubDate=1737302400000, pubDateStr=2025-01-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1762333964531, onlineIssueDateStr=2025-11-05, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1762333964531, creator=13701087609, updateTime=1762333964531, updator=13701087609, issue=Issue{id=1192878363166523716, tenantId=1146029695717560320, journalId=1149653034449285133, year='2025', volume='58', issue='1', pageStart='1', pageEnd='144', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1762333964387, creator=13701087609, updateTime=1762334342663, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1192879949821395698, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1192878363166523716, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1192879949821395699, tenantId=1146029695717560320, journalId=1149653034449285133, issueId=1192878363166523716, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=49, endPage=55, ext={EN=ArticleExt(id=1192878363955048693, articleId=1192878363770499315, tenantId=1146029695717560320, journalId=1149653034449285133, language=EN, title=Effect of extrusion temperature on organization and properties of cable core with double-layer insulation structure, columnId=1190369198472794288, journalTitle=Insulating Materials, columnName=Insulation Technology, runingTitle=null, highlight=null, articleAbstract=
A 0.6/1 kV cable core with double-layer insulation structure was prepared through the double-layer co-extrusion process, and the effect of extrusion temperatures on its surface quality, eccentricity, microstructure, and mechanical properties was investigated. The prepared cable core with double-layer insulation structure was conducted multiple properties tests and heat-resistance life evaluation. The results show that when the extrusion temperature increases from temperature I to temperature II, the prepared double-layer insulation core has flat surface, good brightness, and lower eccentricity between the inner and outer insulation layers (≤15%), and the elongation at break of the insulation core increases from 109% to 221%. When the extrusion temperature increases from temperature II to temperature III, the surface quality of insulation core is deteriorated with distortion and shrinkage on it. Meanwhile, many different sizes of pores can be observed in the longitudinal section, and the tensile strength and elongation at break decrease to 10.7 MPa and 140%, respectively. Compared with the values of JG/T 442—2014 standard, the insulation resistance constant at 20℃, tensile strength and elongation at break before and after ageing, and thermal extensibility of insulation core after electron irradiation cross-linking are significantly improved, indicating that the mechanical properties, ageing properties, and thermal elongation properties of the insulation core with double-layer structure are relatively excellent. Furthermore, after ageing at 165℃/168 h, the elongation at break of insulation core with double-layer strucure has 98% of retention rate, indicating that the insulation core with double-layer structure possesses the outstanding heat-resistance life.
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通过双层共挤工艺制备0.6/1 kV双层绝缘结构电缆线芯,研究不同挤出温度对双层绝缘结构线芯表面质量、偏心度、微观结构和力学性能的影响规律,并对制备的双层绝缘结构线芯进行多项性能测试和耐热寿命评定。结果表明:随着挤出温度从温度I升高至温度II时,制备的双层绝缘结构线芯表面平整,光亮度较好且内外绝缘层偏心度较小(≤15%),此时双层绝缘结构线芯断裂伸长率从109%增加至221%。当挤出温度从温度II升高至温度III时,制备出的双层绝缘结构线芯表面质量恶化,绝缘线芯形状出现扭曲和收缩,且纵截面可观察到许多大小不一的气孔,此时双层绝缘结构线芯抗张强度和断裂伸长率分别下降至10.7 MPa和140%。通过挤出温度II制备的双层绝缘结构线芯经电子辐照交联后,其20℃绝缘电阻常数、老化前后抗张强度和断裂伸长率、热延伸性能显著优于JG/T 442—2014标准中规定值,表明该双层绝缘结构线芯绝缘性能、力学性能、老化性能和热延伸性能较为优异。此外,双层绝缘结构线芯经165℃/168 h老化后,其断裂伸长率保留率达到98%,表明该双层结构的绝缘线芯具有较好的耐热寿命。
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王阳(1992-),男(汉族),安徽安庆人,工程师,博士,研究方向为电线电缆加工制造。
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Schematic diagram of double-layer co-extrusion process, figureFileSmall=/VcC2Ilr8NcRdiG12XNx2w==, figureFileBig=nC1T1atbtB1qfLovgMkFOA==, tableContent=null), ArticleFig(id=1193252723018658214, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=CN, label=图1, caption=
双层共挤工艺示意图, figureFileSmall=/VcC2Ilr8NcRdiG12XNx2w==, figureFileBig=nC1T1atbtB1qfLovgMkFOA==, tableContent=null), ArticleFig(id=1193252724075622823, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=EN, label=Fig.2, caption=
Photos of insulation core with single-layer extrusion, figureFileSmall=yIrE0KXxs0GlIoWEWdQXGQ==, figureFileBig=zbfD+OoQeyqZz/poWFk/9w==, tableContent=null), ArticleFig(id=1193252724125954472, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=CN, label=图2, caption=
内绝缘单层挤出线芯照片, figureFileSmall=yIrE0KXxs0GlIoWEWdQXGQ==, figureFileBig=zbfD+OoQeyqZz/poWFk/9w==, tableContent=null), ArticleFig(id=1193252724180480425, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=EN, label=Fig.3, caption=
Insulation core with double-layer structure prepared at different extrusion temperatures, figureFileSmall=BMnRsitFEoNP+iibetAGVw==, figureFileBig=szuVi+ikWISqM9ogMx65cQ==, tableContent=null), ArticleFig(id=1193252724239200682, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=CN, label=图3, caption=
不同挤出温度制备的双层绝缘结构线芯图, figureFileSmall=BMnRsitFEoNP+iibetAGVw==, figureFileBig=szuVi+ikWISqM9ogMx65cQ==, tableContent=null), ArticleFig(id=1193252724297920939, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=EN, label=Fig.4, caption=
SEM images of liquid nitrogen brittle fracture of insulation cores prepared at different extrusion temperatures, figureFileSmall=e28yZVFcaeeuMPgC6d3DUA==, figureFileBig=cp9gKTzrFO8kF6XMUtoIsg==, tableContent=null), ArticleFig(id=1193252724360835500, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=CN, label=图4, caption=
不同挤出温度制备的双层绝缘结构绝缘线芯液氮脆断SEM图, figureFileSmall=e28yZVFcaeeuMPgC6d3DUA==, figureFileBig=cp9gKTzrFO8kF6XMUtoIsg==, tableContent=null), ArticleFig(id=1193252724419555757, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=EN, label=Fig. 5, caption=
Tensile curves and tensile properties of insulation cores with double-layer structure prepared at different extrusion temperatures, figureFileSmall=qk1oXr9LBHeR5FC8yMo0pg==, figureFileBig=DQwUUXsZDErG5qa/9H6HXw==, tableContent=null), ArticleFig(id=1193252724490858926, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=CN, label=图5, caption=
不同挤出温度制备的双层绝缘结构线芯的拉伸曲线和拉伸性能, figureFileSmall=qk1oXr9LBHeR5FC8yMo0pg==, figureFileBig=DQwUUXsZDErG5qa/9H6HXw==, tableContent=null), ArticleFig(id=1193252724570550703, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=EN, label=Table 1, caption=
Extrusion temperature of inner and outer insulation layers, figureFileSmall=null, figureFileBig=null, tableContent=
| 温度I/oC | 温度II/oC | 温度III/oC |
| 内绝缘 | 140-150-155-165-170-170 | 160-170-175-185-190-190 | 180-190-195-205-210-210 |
| 外绝缘 | 100-110-120-130-140-140-140 | 120-130-140-150-160-160-160 | 140-150-160-170-180-180-180 |
), ArticleFig(id=1193252724671214000, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=CN, label=表1, caption=
内外绝缘层挤出温度
, figureFileSmall=null, figureFileBig=null, tableContent=
| 温度I/oC | 温度II/oC | 温度III/oC |
| 内绝缘 | 140-150-155-165-170-170 | 160-170-175-185-190-190 | 180-190-195-205-210-210 |
| 外绝缘 | 100-110-120-130-140-140-140 | 120-130-140-150-160-160-160 | 140-150-160-170-180-180-180 |
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Eccentricity and thinnest thickness of insulation core with double-layer structure prepared at different extrusion temperatures, figureFileSmall=null, figureFileBig=null, tableContent=
| 温度参数 | 内绝缘层偏心度/% | 外绝缘层偏心度/% | 最薄点总厚度/mm |
| 温度Ⅰ | 42 | 37 | 0.940 |
| 温度Ⅱ | 15 | 12 | 0.850 |
| 温度Ⅲ | 29 | 41 | 1.417 |
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不同挤出温度制备的双层绝缘结构线芯偏心度和最薄点总厚度值
, figureFileSmall=null, figureFileBig=null, tableContent=
| 温度参数 | 内绝缘层偏心度/% | 外绝缘层偏心度/% | 最薄点总厚度/mm |
| 温度Ⅰ | 42 | 37 | 0.940 |
| 温度Ⅱ | 15 | 12 | 0.850 |
| 温度Ⅲ | 29 | 41 | 1.417 |
), ArticleFig(id=1193252724843180467, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=EN, label=Table 3, caption=
Properties test results of insulation core with double-layer insulation structure in the research, figureFileSmall=null, figureFileBig=null, tableContent=
| 项 目 | 标准值 | 实测值 |
| 20℃绝缘电阻常数 | ≥3 670 MΩ·km | 5 462 MΩ·km |
| 老化前绝缘层力学性能 | 抗张强度≥9 MPa,断裂伸长率≥150% | 抗张强度为12.5 MPa,断裂伸长率为235% |
| 老化后(135℃/168 h)绝缘层力学性能 | 抗张强度和断裂伸长率变化率均小于30% | 抗张强度变化率为2%,断裂伸长率变化率为4% |
| 绝缘层热延伸性能(200℃、15 min、20 N/cm2) | 最大伸长率≤175% | 最大伸长率为25% |
| 寿命评定试验(165℃/168 h) | 断裂伸长率保留率不低于原始值的50% | 断裂伸长率保留率为98% |
), ArticleFig(id=1193252724914483636, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1192878363770499315, language=CN, label=表3, caption=
本研究制备的双层绝缘结构线芯性能检测结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项 目 | 标准值 | 实测值 |
| 20℃绝缘电阻常数 | ≥3 670 MΩ·km | 5 462 MΩ·km |
| 老化前绝缘层力学性能 | 抗张强度≥9 MPa,断裂伸长率≥150% | 抗张强度为12.5 MPa,断裂伸长率为235% |
| 老化后(135℃/168 h)绝缘层力学性能 | 抗张强度和断裂伸长率变化率均小于30% | 抗张强度变化率为2%,断裂伸长率变化率为4% |
| 绝缘层热延伸性能(200℃、15 min、20 N/cm2) | 最大伸长率≤175% | 最大伸长率为25% |
| 寿命评定试验(165℃/168 h) | 断裂伸长率保留率不低于原始值的50% | 断裂伸长率保留率为98% |
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