CN117301637B - 一种复合pe电缆导管及其制备方法 - Google Patents
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- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 30
- VLCLHFYFMCKBRP-UHFFFAOYSA-N tricalcium;diborate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]B([O-])[O-].[O-]B([O-])[O-] VLCLHFYFMCKBRP-UHFFFAOYSA-N 0.000 claims abstract description 28
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Abstract
本申请涉及PE电缆领域,具体公开了一种复合PE电缆导管及其制备方法。一种复合PE电缆导管,包括保护外层、加固中间层、以及PE内层;保护外层,包括高密度聚乙烯、水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂;加固中间层包括高密度聚乙烯、超高分子量聚乙烯、乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒;PE内层,包括低密度聚乙烯、硅橡胶、交联剂。本申请的制备方法,经过配料、备料、加固中间层和PE内层成型、固化、涂覆保护外层等步骤制备得到的复合PE电缆导管具有较好的抗紫外线性能和力学性能,使得本申请的复合PE电缆导管适用于紫外线较强的高原地区室外电缆的敷设,扩大PE电缆导管的应用范围。
Description
技术领域
本申请涉及PE电缆领域,更具体地说,它涉及一种复合PE电缆导管及其制备方法。
背景技术
电缆导管是一种用于保护、支撑、引导、管理电缆的管状结构。它通常由金属或塑料材料制成,用于将电缆安全地引导和布置在建筑物、地下、地面或其他环境中。
常用的塑料电缆导管材料有PVC、PE、FRP。PE材质的电缆导管具有耐腐蚀性强、绝缘性好、耐磨性好、成本低廉等优点,因而被广泛应用于建筑物内部电力电缆布线。
然而,PE电缆导管具有抗紫外线能力差的缺点,不适用于紫外线较强的高原地区室外电缆的敷设,这限制了PE电缆导管的应用范围。
发明内容
为了提高PE电缆导管的抗紫外线能力,适用于紫外线较强的高原地区室外电缆的敷设,扩大PE电缆导管的应用范围,本申请提供一种复合PE电缆导管及其制备方法。
本申请提供的名称采用如下的技术方案:
第一方面,本申请提供一种复合PE电缆导管,采用如下的技术方案:
一种复合PE电缆导管,包括保护外层、加固中间层、以及PE内层;所述保护外层,按重量份数,包括有以下组分:高密度聚乙烯50-70份、水性聚氨酯100-120份、木质素纳米颗粒5-10份、硼酸钙3-5份、氢氧化镁纳米颗粒4-6份、流平剂1-3份。
通过采用上述技术方案,木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒协同增效,能够提高PE抗紫外线的效果。木质素纳米颗粒和氢氧化镁纳米颗粒可吸收全波段的紫外线,硼酸钙熔化后形成玻璃态的保护层,可反射紫外线,木质素纳米颗粒和氢氧化镁纳米颗粒均匀分布在硼酸钙熔化后形成玻璃态的保护层中,协同增效,起到较好的抗紫外线的效果。木质素纳米颗粒和氢氧化镁均匀在高密度聚乙烯中,能起到加强保护外层的结构强度的作用,水性聚氨酯使得氢氧化镁纳米颗粒更容易分散,也使得保护外层牢固地附着在加固中间外层上。
可选的,所述加固中间层包括高密度聚乙烯80-120份、超高分子量聚乙烯10-20份、乙烯基三甲氧基硅烷5-10份、Al2O3纳米颗粒5-6份、竹炭纳米颗粒5-10份。
通过采用上述技术方案,高密度聚乙烯、超高分子量聚乙烯通过乙烯基三甲氧基硅烷交联成网状结构,Al2O3纳米颗粒填充于网状结构之间,可以提高加固中间层的力学性能,进而提高本申请的复合PE电缆导管的力学性能。竹炭纳米颗粒能吸收紫外线,进一步提高本申请的复合PE电缆导管的抗紫外线能力。
可选的,所述PE内层,按重量份数,包括有以下组分:低密度聚乙烯80-120份、硅橡胶10-20份、交联剂5-8份。
通过采用上述技术方案,低密度聚乙烯与硅橡胶通过交联剂交联成交联结构,具有较好的电气绝缘性、耐腐蚀性、力学性能、内壁光滑,有利于电缆穿过,提高了安装、整理电缆的方便度。
可选的,所述流平剂选用聚二甲基硅氧烷、聚甲基苯基硅氧烷的组合。
试验发现,流平剂选用聚二甲基硅氧烷、聚甲基苯基硅氧烷的组合,保护外层的涂覆效果好,保护外层表面光滑、平整、无气泡,进而提高了本申请的复合PE电缆导管的抗紫外效果。
可选的,所述二甲基硅氧烷、聚甲基苯基硅氧烷的比例为1:(1-2)。
通过采用上述技术方案,二甲基硅氧烷、聚甲基苯基硅氧烷的比例为1:(1-2),保护外层表面光滑、平整、无气泡,进而提高了本申请的复合PE电缆导管的抗紫外效果。
可选的,所述木质素纳米颗粒的粒径为10-20纳米。
试验发现,木质素纳米颗粒的粒径为10-20纳米时,木质素纳米颗粒与硼酸钙、氢氧化镁纳米颗粒的协同效果更好,进而使得本申请的复合PE电缆导管的抗紫外效果更好。
可选的,所述交联剂选用烯酸羟乙酯。
通过采用上述技术方案,交联剂选用烯酸羟乙酯,低密度聚乙烯与硅橡胶的交联效果更好。
可选的,保护外层厚度为1mm、加固中间层厚度为4mm、PE内层厚度为2mm。
通过采用上述技术方案,所述保护外层厚度为1mm可起较好的抗紫外线的作用,加固中间层厚度为4mm,使得本申请的复合PE电缆导管的力学性能较好,PE内层厚度为2mm,耐磨。
第二方面,本申请提供一种复合PE电缆导管的制备方法,采用如下的技术方案:
一种上述的一种复合PE电缆导管的制备方法,包括有以下步骤:
配料:按重量份数称取制备PE内层所需的低密度聚乙烯、硅橡胶、交联剂;按重量份数称取制备加固中间层所需的高密度聚乙烯、超高分子量聚乙烯、乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒;按重量份数称取制备保护外层所需的高密度聚乙烯、水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂;
备料:将低密度聚乙烯、硅橡胶分别热熔后,加入交联剂混合均匀,混合温度为105-120℃,混合30-40分钟,得到PE内层料,备用;将高密度聚乙烯、超高分子量聚乙烯分别热熔后,加入乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒,混合均匀,混合温度为130-140℃,混合40-60分钟,得到中间加固层料,备用;将高密度聚乙烯、硼酸钙、热熔后,加入水性聚氨酯、木质素纳米颗粒、氢氧化镁纳米颗粒、流平剂混合均匀,混合温度为50-60℃,混合30-60分钟,得到保护外层料,备用;
加固中间层和PE内层成型:采用双层共挤的方式,将PE内层料和中间加固层料同时挤出,得到具备中间加固层和PE内层的双层管;
固化:将双层管在固化温度下维持4-6小时,在常温下冷却1-2小时;
涂覆保护外层:将保护外层料涂覆在固化后的双层管外,在常温下静置12-14小时,形成保护外层。
通过采用上述技术方案,经过配料、备料、加固中间层和PE内层成型、固化、涂覆保护外层等步骤制备得到的复合PE电缆导管具有较好的抗紫外线性能和力学性能。加固中间层和PE内层成型的步骤中,采用双层共挤的方式,加固中间层与PE内层一体成型,加固中间层与PE内层贴合十分紧密,不易分离,进而提高了本申请的复合PE电缆导管的力学性能。在加固中间层与PE内层固化后,保护外层料涂覆在加固中间层外,经过静置后,保护外层料固化形成的保护外层与加固中间层贴合十分紧密,不易分离,进而提高了本申请的复合PE电缆导管的力学性能和抗紫外线能力。
可选的,所述固化步骤中,固化温度为170-190℃。
试验发现,固化温度为170-190℃时,加固中间层与PE内层的固化效果更好,进而使得加固中间层与PE内层贴合更紧密,不易分离,进而提高了本申请的复合PE电缆导管的力学性能。
综上所述,本申请具有以下有益效果:
1、由于本申请的复合PE电缆导管采用保护外层、加固中间层、以及PE内层,由于保护外层包括高密度聚乙烯、水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂,由于木质素纳米颗粒和氢氧化镁纳米颗粒可吸收全波段的紫外线,硼酸钙熔化后形成玻璃态的保护层,可反射紫外线,木质素纳米颗粒和氢氧化镁纳米颗粒均匀分布在硼酸钙熔化后形成玻璃态的保护层中,协同增效,起到较好的抗紫外线的效果。
2、本申请的加固中间层包括高密度聚乙烯、超高分子量聚乙烯、乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒,高密度聚乙烯、超高分子量聚乙烯通过乙烯基三甲氧基硅烷交联成网状结构,Al2O3纳米颗粒填充于网状结构之间,可以提高加固中间层的力学性能,进而提高本申请的复合PE电缆导管的力学性能。竹炭纳米颗粒能吸收紫外线,进一步提高本申请的复合PE电缆导管的抗紫外线能力。
3、本申请的制备方法,加固中间层和PE内层成型的步骤中,采用双层共挤的方式,加固中间层与PE内层一体成型,加固中间层与PE内层贴合十分紧密,不易分离,进而提高了本申请的复合PE电缆导管的力学性能。在加固中间层与PE内层固化后,保护外层料涂覆在加固中间层外,经过静置后,保护外层料固化形成的保护外层与加固中间层贴合十分紧密,不易分离,进而提高了本申请的复合PE电缆导管的力学性能和抗紫外线能力。
具体实施方式
以下对本申请作进一步详细说明。
原料介绍
实施例1-3以及对比例1-5的原料介绍见下表:
原料 | 出处及型号介绍 |
超高分子量聚乙烯 | 型号:GUR-4014,分子量:500万 |
高密度聚乙烯 | 型号:DMDA-8008H,分子量:40万 |
低密度聚乙烯 | 型号:1C7A,分子量:8万 |
水性聚氨酯 | 型号:PU-600R,含量≥99% |
木质素纳米颗粒 | 型号:8068-05-1,含量≥98%,粒径为10-20nm |
硼酸钙 | 化学式:CaO·3B2O3·4H2O,含量≥99% |
氢氧化镁纳米颗粒 | 型号:5-C,粒径为100-120nm |
聚二甲基硅氧烷 | CAS:63148-62-9,含量≥99.9% |
聚甲基苯基硅氧烷 | CAS:63148-58-3,含量≥99% |
乙烯基三甲氧基硅烷 | CAS:2768-02-7,含量≥99% |
Al2O3纳米颗粒 | 型号:JS-100,粒径为80-100nm |
竹炭纳米颗粒 | 型号:AJ05,粒径为80-100nm |
硅橡胶 | 型号:SS354,含量≥99% |
丙烯酸羟乙酯 | CAS:818-61-1,含量≥99.9% |
实施例
实施例1
一种复合PE电缆导管,包括保护外层、加固中间层、以及PE内层,保护外层厚度为1mm、加固中间层厚度为4mm、PE内层厚度为2mm;
保护外层,按重量份数,包括有以下组分:高密度聚乙烯50份、水性聚氨酯120份、木质素纳米颗粒5份、硼酸钙5份、氢氧化镁纳米颗粒4份、流平剂3份;流平剂选用聚二甲基硅氧烷、聚甲基苯基硅氧烷的组合,二甲基硅氧烷、聚甲基苯基硅氧烷的比例为1:2;
加固中间层包括高密度聚乙烯80份、超高分子量聚乙烯20份、乙烯基三甲氧基硅烷5份、Al2O3纳米颗粒6份、竹炭纳米颗粒5份;
PE内层,按重量份数,包括有以下组分:低密度聚乙烯120份、硅橡胶10份、交联剂8份,交联剂选用烯酸羟乙酯。
上述的一种复合PE电缆导管的制备方法,包括有以下步骤:
配料:按重量份数称取制备PE内层所需的低密度聚乙烯、硅橡胶、交联剂;按重量份数称取制备加固中间层所需的高密度聚乙烯、超高分子量聚乙烯、乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒;按重量份数称取制备保护外层所需的高密度聚乙烯、水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂;
备料:将低密度聚乙烯、硅橡胶分别热熔后,加入交联剂混合均匀,混合温度为105℃,混合40分钟,得到PE内层料,备用;将高密度聚乙烯、超高分子量聚乙烯分别热熔后,加入乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒,混合均匀,混合温度为130℃,混合60分钟,得到中间加固层料,备用;将高密度聚乙烯热熔后,加入水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂混合均匀,混合温度为50℃,混合30分钟,得到保护外层料,备用;
加固中间层和PE内层成型:采用双层共挤的方式,将PE内层料和中间加固层料同时挤出,得到具备中间加固层和PE内层的双层管;
固化:将双层管在固化温度下维持4小时,固化温度为190℃,再在常温下冷却1小时;
涂覆保护外层:将保护外层料涂覆在固化后的双层管外,在常温下静置14小时,形成保护外层。
实施例2
一种复合PE电缆导管,包括保护外层、加固中间层、以及PE内层,保护外层厚度为1mm、加固中间层厚度为4mm、PE内层厚度为2mm;
保护外层,按重量份数,包括有以下组分:高密度聚乙烯70份、水性聚氨酯100份、木质素纳米颗粒10份、硼酸钙3份、氢氧化镁纳米颗粒6份、流平剂1份;流平剂选用聚二甲基硅氧烷、聚甲基苯基硅氧烷的组合,二甲基硅氧烷、聚甲基苯基硅氧烷的比例为1:1;
加固中间层包括高密度聚乙烯120份、超高分子量聚乙烯10份、乙烯基三甲氧基硅烷10份、Al2O3纳米颗粒5份、竹炭纳米颗粒10份;
PE内层,按重量份数,包括有以下组分:低密度聚乙烯80份、硅橡胶20份、交联剂5份,交联剂选用烯酸羟乙酯。
上述的一种复合PE电缆导管的制备方法,包括有以下步骤:
配料:按重量份数称取制备PE内层所需的低密度聚乙烯、硅橡胶、交联剂;按重量份数称取制备加固中间层所需的高密度聚乙烯、超高分子量聚乙烯、乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒;按重量份数称取制备保护外层所需的高密度聚乙烯、水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂;
备料:将低密度聚乙烯、硅橡胶分别热熔后,加入交联剂混合均匀,混合温度为120℃,混合30分钟,得到PE内层料,备用;将高密度聚乙烯、超高分子量聚乙烯分别热熔后,加入乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒,混合均匀,混合温度为140℃,混合40分钟,得到中间加固层料,备用;将高密度聚乙烯热熔后,加入水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂混合均匀,混合温度为60℃,混合60分钟,得到保护外层料,备用;
加固中间层和PE内层成型:采用双层共挤的方式,将PE内层料和中间加固层料同时挤出,得到具备中间加固层和PE内层的双层管;
固化:将双层管在固化温度下维持6小时,固化温度为170℃,再在常温下冷却2小时;
涂覆保护外层:将保护外层料涂覆在固化后的双层管外,在常温下静置12小时,形成保护外层。
实施例3
一种复合PE电缆导管,包括保护外层、加固中间层、以及PE内层,保护外层厚度为1mm、加固中间层厚度为4mm、PE内层厚度为2mm;
保护外层,按重量份数,包括有以下组分:高密度聚乙烯60份、水性聚氨酯110份、木质素纳米颗粒8份、硼酸钙4份、氢氧化镁纳米颗粒5份、流平剂2份;流平剂选用聚二甲基硅氧烷、聚甲基苯基硅氧烷的组合,二甲基硅氧烷、聚甲基苯基硅氧烷的比例为1:1.5;
加固中间层包括高密度聚乙烯80-120份、超高分子量聚乙烯15份、乙烯基三甲氧基硅烷7份、Al2O3纳米颗粒5.5份、竹炭纳米颗粒7.5份;
PE内层,按重量份数,包括有以下组分:低密度聚乙烯100份、硅橡胶15份、交联剂6.5份,交联剂选用烯酸羟乙酯。
上述的一种复合PE电缆导管的制备方法,包括有以下步骤:
配料:按重量份数称取制备PE内层所需的低密度聚乙烯、硅橡胶、交联剂;按重量份数称取制备加固中间层所需的高密度聚乙烯、超高分子量聚乙烯、乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒;按重量份数称取制备保护外层所需的高密度聚乙烯、水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂;
备料:将低密度聚乙烯、硅橡胶分别热熔后,加入交联剂混合均匀,混合温度为113℃,混合35分钟,得到PE内层料,备用;将高密度聚乙烯、超高分子量聚乙烯分别热熔后,加入乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒,混合均匀,混合温度为135℃,混合50分钟,得到中间加固层料,备用;将高密度聚乙烯热熔后,加入水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂混合均匀,混合温度为55℃,混合45分钟,得到保护外层料,备用;
加固中间层和PE内层成型:采用双层共挤的方式,将PE内层料和中间加固层料同时挤出,得到具备中间加固层和PE内层的双层管;
固化:将双层管在固化温度下维持5小时,固化温度为180℃,再在常温下冷却1.5小时;涂覆保护外层:将保护外层料涂覆在固化后的双层管外,在常温下静置13小时,形成保护外层。
对比例
对比例1
对比例1为市售壁厚7mm的PE电缆导管。
对比例2
对比例2与实施例3的区别在于,保护外层不添加木质素纳米颗粒。
对比例3
对比例3与实施例3的区别在于,保护外层不添加硼酸钙。
对比例4
对比例4与实施例3的区别在于,保护外层不添加氢氧化镁纳米颗粒。
对比例5
对比例5与实施例3的区别在于,保护外层不添加木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒。
性能检测
紫外线老化试验:将实施例1-3的复合PE电缆导管、对比例1的PE电缆导管、对比例2-5的复合PE电缆导管分别放入QUV紫外老化箱,紫外线辐照强度为0.68W/m2,黑板温度为63℃,紫外线连续照射720小时,无喷淋。在实施例1-3的复合PE电缆导管、对比例1的PE电缆导管、对比例2-5的复合PE电缆导管进行紫外线老化试验前后,分别取样进行力学性能检测和色差检测。
力学性能检测:采用电子万能拉力试验机,参考GB/T 8804.3-2003《热塑性塑料管材拉伸性能测定第3部分聚烯烃管材》测定卷芯管的拉伸屈服强度、断裂伸长率。
色差变化检测:采用色差仪测定实施例1-3的复合PE电缆导管、对比例1的PE电缆导管、对比例2-5的复合PE电缆导管进行紫外线老化试验前后的色差。
检测结果见下表:
对比实施例1-3与对比例1,实施例1-3的拉伸屈服强度均大于38Mpa,断裂伸长率均高于600%,紫外线老化试验前后色差变化ΔL、Δa、Δb值均在0.1以下,而对比例1的拉伸屈服强度和断裂伸长率明显低于实施例1-3,且对比例1的紫外线老化试验前后色差变化ΔL、Δa、Δb值均大于2,本申请的复合PE电缆导管的抗紫外线性能和力学性能均明显优于市售PE电缆导管,因而本申请的复合PE电缆导管适用于紫外线较强的高原地区室外电缆的敷设,扩大PE电缆导管的应用范围。
对比实施例1-3与对比例2,实施例1-3的拉伸屈服强度明显高于对比例2,实施例1-3的断裂伸长率也明显高于对比例2,实施例1-3的紫外线老化试验前后ΔL、Δa、Δb值均明显小于对比例2的紫外线老化试验前后对应的ΔL、Δa、Δb值,说明木质素纳米颗粒对本申请的复合PE电缆导管的抗紫外线性能和力学性能都有重要的影响。
对比实施例1-3与对比例3,实施例1-3的拉伸屈服强度明显高于对比例3,实施例1-3的断裂伸长率也明显高于对比例3,实施例1-3的紫外线老化试验前后ΔL、Δa、Δb值均明显小于对比例3的紫外线老化试验前后对应的ΔL、Δa、Δb值,说明硼酸钙对本申请的复合PE电缆导管的抗紫外线性能和力学性能都有重要的影响。
对比实施例1-3与对比例4,实施例1-3的拉伸屈服强度明显高于对比例4,实施例1-3的断裂伸长率也明显高于对比例4,实施例1-3的紫外线老化试验前后ΔL、Δa、Δb值均明显小于对比例4的紫外线老化试验前后对应的ΔL、Δa、Δb值,说明氢氧化镁纳米颗粒对本申请的复合PE电缆导管的抗紫外线性能和力学性能都有重要的影响。
对比实施例1-3与对比例5,实施例1-3的拉伸屈服强度明显高于对比例5,实施例1-3的断裂伸长率也明显高于对比例5,实施例1-3的紫外线老化试验前后ΔL、Δa、Δb值均明显小于对比例5的紫外线老化试验前后对应的ΔL、Δa、Δb值,说明木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒具有协同增效的作用,对本申请的复合PE电缆导管的抗紫外线性能和力学性能都有重要的影响。
上述具体实施例仅仅是对本申请的解释,其并不是对本申请的限制,本领域技术人员在阅读完本说明书后可以根据需要对本申请做出没有创造性贡献的修改,但均应涵盖于本申请的保护范围之内。
Claims (9)
1.一种复合PE电缆导管,其特征在于:包括保护外层、加固中间层、以及PE内层;所述保护外层,按重量份数,包括有以下组分:高密度聚乙烯50-70份、水性聚氨酯100-120份、木质素纳米颗粒5-10份、硼酸钙3-5份、氢氧化镁纳米颗粒4-6份、流平剂1-3份;
所述加固中间层包括高密度聚乙烯80-120份、超高分子量聚乙烯10-20份、乙烯基三甲氧基硅烷5-10份、Al2O3纳米颗粒5-6份、竹炭纳米颗粒5-10份。
2.根据权利要求1所述的一种复合PE电缆导管,其特征在于:所述PE内层,按重量份数,包括有以下组分:低密度聚乙烯80-120份、硅橡胶10-20份、交联剂5-8份。
3.根据权利要求1所述的一种复合PE电缆导管,其特征在于:所述流平剂选用聚二甲基硅氧烷、聚甲基苯基硅氧烷的组合。
4.根据权利要求3所述的一种复合PE电缆导管,其特征在于:所述二甲基硅氧烷、聚甲基苯基硅氧烷的比例为1:(1-2)。
5.根据权利要求1所述的一种复合PE电缆导管,其特征在于:所述木质素纳米颗粒的粒径为10-20纳米。
6.根据权利要求2所述的一种复合PE电缆导管,其特征在于:所述交联剂选用烯酸羟乙酯。
7.根据权利要求1所述的一种复合PE电缆导管,其特征在于:所述保护外层厚度为1mm、加固中间层厚度为4mm、PE内层厚度为2mm。
8.一种权利要求1~7任意一项所述的一种复合PE电缆导管的制备方法,其特征在于:包括有以下步骤:
配料:按重量份数称取制备PE内层所需的低密度聚乙烯、硅橡胶、交联剂;按重量份数称取制备加固中间层所需的高密度聚乙烯、超高分子量聚乙烯、乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒;按重量份数称取制备保护外层所需的高密度聚乙烯、水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂;
备料:将低密度聚乙烯、硅橡胶分别热熔后,加入交联剂混合均匀,混合温度为105-120℃,混合30-40分钟,得到PE内层料,备用;将高密度聚乙烯、超高分子量聚乙烯分别热熔后,加入乙烯基三甲氧基硅烷、Al2O3纳米颗粒、竹炭纳米颗粒,混合均匀,混合温度为130-140℃,混合40-60分钟,得到中间加固层料,备用;将高密度聚乙烯热熔后,加入水性聚氨酯、木质素纳米颗粒、硼酸钙、氢氧化镁纳米颗粒、流平剂混合均匀,混合温度为50-60℃,混合30-60分钟,得到保护外层料,备用;
加固中间层和PE内层成型:采用双层共挤的方式,将PE内层料和中间加固层料同时挤出,得到具备中间加固层和PE内层的双层管;
固化:将双层管在固化温度下维持4-6小时,在常温下冷却1-2小时;
涂覆保护外层:将保护外层料涂覆在固化后的双层管外,在常温下静置12-14小时,形成保护外层。
9.根据权利要求8所述的一种复合PE电缆导管的制备方法,其特征在于:所述固化步骤中,固化温度为170-190℃。
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