CN111907133A - 一种高硬度耐摩擦三层共挤mpp电缆保护管 - Google Patents

一种高硬度耐摩擦三层共挤mpp电缆保护管 Download PDF

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CN111907133A
CN111907133A CN202010791948.9A CN202010791948A CN111907133A CN 111907133 A CN111907133 A CN 111907133A CN 202010791948 A CN202010791948 A CN 202010791948A CN 111907133 A CN111907133 A CN 111907133A
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袁森
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Shanghai Bst Tubing Co ltd
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Abstract

本发明公开了一种高硬度耐摩擦三层共挤MPP电缆保护管,包括电缆本体以及复合层内层，所述复合层内层位于电缆本体外侧，所述复合层内层外侧固定设置有复合层中间层，所述复合层中间层外侧固定设置有外层，所述外层为以改性聚丙烯为增强介质形成的骨架层，所述外层外侧覆有阻燃隔离剂，所述复合层中间层以改性聚丙烯与玻璃纤维融合的中间层；外壁洛氏硬度达到95，外壁硬度高耐磨损，做够埋地或非开挖使用，有利于在各地层中使用，中间夹层与内外层的结合强度高，撕裂强度达到30MPa，中间夹层与内外两层实现分子级结合，整体结构稳固，整体强度高。内层润滑性好，内壁润滑性好，摩擦阻力小，静摩擦系数0.15，焊接性能好，焊接强度23MPa。

Description

一种高硬度耐摩擦三层共挤MPP电缆保护管
技术领域
本发明涉及电力设备技术领域，特别是涉及一种高硬度耐摩擦三层共挤MPP电缆保护管。
背景技术
电缆保护管是指为了防止电缆受到损伤，敷设在电缆外层，具有一定机械强度的金属保护管。电缆保护管主要安装在通讯电缆与电力线交叉的地段，防止电力线发生断线造成短路事故，引起通讯电缆和钢丝绳带电，以保护电缆、交换机、机芯板，以至整机不被烧坏，对电力线磁场干扰也起到一定的隔离作用。
MPP电力管属聚烯烃类电缆保护管，相较HDPE电力管，它有更高的强度和维卡软化点温度，因而适应更高温度下的电力电缆运行。相较PVC电力管和CPVC电力管，它的韧性和低温抗冲击性更优良，而且具有良好焊接性能，可用于环境不复杂，不允许开挖的非开挖工程。因此广泛应用于电缆保护管领域。
MPP塑钢复合管外层为玻璃纤维缠绕，内层为MPP管，形成一种双层结构，保证了外部的强度，也能够保证内层的维卡软化点温度和低摩擦性。然而现有的MPP塑钢复合管也有它自身的缺陷，内外层是通过外层缠绕的形式结合的，容易分层，不具有焊接性能，无法应用于非开挖工程的问题，为此我们提出一种高硬度耐摩擦三层共挤MPP电缆保护管。
发明内容
为了克服现有技术的不足，本发明提供一种高硬度耐摩擦三层共挤MPP电缆保护管，能解决现有的MPP塑钢复合管也有它自身的缺陷，内外层是通过外层缠绕的形式结合的，容易分层，不具有焊接性能，无法应用于非开挖工程的技术问题。
为解决上述技术问题，本发明提供如下技术方案：一种高硬度耐摩擦三层共挤MPP电缆保护管，包括电缆本体以及复合层内层，所述复合层内层位于电缆本体外侧，所述复合层内层外侧固定设置有复合层中间层，所述复合层中间层外侧固定设置有外层，所述外层为以改性聚丙烯为增强介质形成的骨架层，所述外层外侧覆有阻燃隔离剂，所述复合层中间层以改性聚丙烯与玻璃纤维融合的中间层；
所述复合层中间层中改性聚丙烯质量比范围为25-30％，所述复合层中间层中玻璃纤维质量比范围为70-75％，所述复合层内层中硅酮母料质量比范围为40-50％，所述复合层内层中改性聚丙烯质量比范围为50-60％。
作为本发明的一种优选技术方案，所述复合层内层、复合层中间层以及外层通过三台螺杆挤出机以及一个共享的三通道模具口共同挤出成型，得到一体成型的管体结构。
作为本发明的一种优选技术方案，包括以下步骤：
(1)将改性聚丙烯及聚丙烯蜡进行干燥；
(2)称取干燥后的改性聚丙烯25-30份、聚丙烯蜡5-8份、玻璃纤维40-60份、增韧剂2-5份，加入高速混合机中搅拌5-8min；
(3)将混合均匀的物料从螺杆挤出机的加料口加入，经螺杆挤出机熔融挤出、造粒，制备得玻纤增强聚丙烯组合物管体。
作为本发明的一种优选技术方案，所述中改性聚丙烯燥温度为60-80℃,干燥时间3-6h。
作为本发明的一种优选技术方案，所述中聚丙烯蜡燥温度为50-80℃,干燥时间5-7h。
作为本发明的一种优选技术方案，包括以下步骤：
(1)先将100～120份的硅酮与改性聚丙烯按重量比1：1.2混合均匀，然后再将其放入螺杆挤出机中于180～190℃熔融挤出造粒得改性母料；
(2)先将改性母料干燥后通过螺杆挤出机于170～195℃熔融复合挤出、定径、牵引、冷却、切割得复合管材；
(3)将所得复合管材按机械缠绕方式在电缆本体(1)外侧即可。
作为本发明的一种优选技术方案，所述复合层内层含有硅酮的表面摩擦系数为0.08～0.23。
作为本发明的一种优选技术方案，所述复合层内层内表面还设置有隔热涂。
与现有技术相比，本发明能达到的有益效果是：
1、外壁洛氏硬度达到95(常规MPP电力管洛氏硬度70左右)，外壁硬度高耐磨损，相同尺寸条件下，环刚度等级是常规MPP电力管的4倍，是MPP塑钢复合管的0.8倍，下降并不多，做够埋地或非开挖使用，有利于在各地层中使用。
2、中间夹层与内外层的结合强度高，撕裂强度达到30MPa(常规MPP管无此要求，MPP塑钢复合管内外层通过缠绕的方式进行结合，结合强度低，仅有撕裂强度仅有10MPa)，甚至超过了常规MPP管的断裂强度，中间夹层与内外两层实现分子级结合，整体结构稳固，整体强度高。
3、内层润滑性好，内壁润滑性好，摩擦阻力小，静摩擦系数0.15(常规MPP电力管及MPP塑钢复合管内壁静摩擦系数0.3左右。
4、复合层中间层收缩性较内外层大，管材成型冷却后，中间层自动收缩，管材切口界面仍具有焊接性能，焊接性能好，焊接强度23MPa，基本上与常规MPP电力管持平，证明焊接性能没有收到中间夹层的影响。
附图说明
图1为本发明MPP电缆保护管结构示意图；
其中：1、电缆本体；2、复合层内层；3、复合层中间层；4、外层。
具体实施方式
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，下面结合具体实施例，进一步阐述本发明，但下述实施例仅仅为本发明的优选实施例，并非全部。基于实施方式中的实施例，本领域技术人员在没有做出创造性劳动的前提下所获得其它实施例，都属于本发明的保护范围。下述实施例中的实验方法，如无特殊说明，均为常规方法，下述实施例中所用的材料、试剂等，如无特殊说明，均可从商业途径得到。
实施例1:
如图1所示，一种高硬度耐摩擦三层共挤MPP电缆保护管，包括电缆本体1以及复合层内层2，复合层内层2位于电缆本体1外侧，复合层内层2外侧固定设置有复合层中间层3，复合层中间层3外侧固定设置有外层4，外层4为以改性聚丙烯为增强介质形成的骨架层，外层4外侧覆有阻燃隔离剂，复合层中间层3以改性聚丙烯与玻璃纤维融合的中间层；
复合层中间层3中改性聚丙烯质量比范围为25-30％，复合层中间层3中玻璃纤维质量比范围为70-75％，复合层内层2中硅酮母料质量比范围为40-50％，复合层内层2中改性聚丙烯质量比范围为50-60％。
(1)将聚丙烯及聚丙烯蜡在温度60℃下干燥6h；
(2)称取干燥的30份的聚丙烯、5份的聚丙烯蜡、40份的玻璃纤维、2份增韧剂；
(3)将上述步骤复合层内层2中称好的物料在高速混合机中搅拌6min；
(4)然后将上述混合均匀的物料加入螺杆挤出机的加料口，经螺杆挤出机熔融挤出，造粒，制得玻璃纤维聚丙烯组合物。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
以上显示和描述了本发明的基本原理、主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的仅为本发明的优选例，并不用来限制本发明，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。

Claims (8)

1.一种高硬度耐摩擦三层共挤MPP电缆保护管，包括电缆本体(1)以及复合层内层(2)，其特征在于：所述复合层内层(2)位于电缆本体(1)外侧，所述复合层内层(2)外侧固定设置有复合层中间层(3)，所述复合层中间层(3)外侧固定设置有外层(4)，所述外层(4)为以改性聚丙烯为增强介质形成的骨架层，所述外层(4)外侧覆有阻燃隔离剂，所述复合层中间层(3)以改性聚丙烯与玻璃纤维融合的中间层；
所述复合层中间层(3)中改性聚丙烯质量比范围为25-30％，所述复合层中间层(3)中玻璃纤维质量比范围为70-75％，所述复合层内层(2)中硅酮母料质量比范围为40-50％，所述复合层内层(2)中改性聚丙烯质量比范围为50-60％。
2.根据权利要求1一种高硬度耐摩擦三层共挤MPP电缆保护管，其特征在于：所述复合层内层(2)、复合层中间层(3)以及外层(4)通过三台螺杆挤出机以及一个共享的三通道模具口共同挤出成型，得到一体成型的管体结构。
3.根据权利要求2一种高硬度耐摩擦三层共挤MPP电缆保护管，其特征在于，包括以下步骤：
(1)将改性聚丙烯及聚丙烯蜡进行干燥；
(2)称取干燥后的改性聚丙烯25-30份、聚丙烯蜡5-8份、玻璃纤维40-60份、增韧剂2-5份，加入高速混合机中搅拌5-8min；
(3)将混合均匀的物料从螺杆挤出机的加料口加入，经螺杆挤出机熔融挤出、造粒，制备得玻纤增强聚丙烯组合物管体。
4.根据权利要求3一种高硬度耐摩擦三层共挤MPP电缆保护管，其特征在于：所述中改性聚丙烯燥温度为60-80℃,干燥时间3-6h。
5.根据权利要求3一种高硬度耐摩擦三层共挤MPP电缆保护管，其特征在于：所述中聚丙烯蜡燥温度为50-80℃,干燥时间5-7h。
6.根据权利要求2一种高硬度耐摩擦三层共挤MPP电缆保护管，其特征在于，包括以下步骤：
(1)先将100～120份的硅酮与改性聚丙烯按重量比1：1.2混合均匀，然后再将其放入螺杆挤出机中于180～190℃熔融挤出造粒得改性母料；
(2)先将改性母料干燥后通过螺杆挤出机于170～195℃熔融复合挤出、定径、牵引、冷却、切割得复合管材；
(3)将所得复合管材按机械缠绕方式在电缆本体(1)外侧即可。
7.根据权利要求6一种高硬度耐摩擦三层共挤MPP电缆保护管，其特征在于：所述复合层内层(2)含有硅酮的表面摩擦系数为0.08～0.23。
8.根据权利要求6一种高硬度耐摩擦三层共挤MPP电缆保护管，其特征在于：所述复合层内层(2)内表面还设置有隔热涂层。
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