CN116675934A - 外护套及其制造工艺和具有该外护套的b1级低压交联电缆 - Google Patents
外护套及其制造工艺和具有该外护套的b1级低压交联电缆 Download PDFInfo
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Abstract
本发明涉及一种外护套及其制造工艺和具有该外护套的B1级低压交联电缆。这种外护套由如下重量份的原料制成:PVC树脂100~105份,增塑剂DINP 30~32份,增塑剂DOTP 35~38份,稳定剂7~8份,阻燃剂三氧化二锑6~8份,润滑剂聚乙烯蜡0.5~0.8份,加工助剂ACR 1.6~1.8份,氢氧化铝30~32份,氢氧化镁20~25份和硼酸锌10~15份。本发明在普通电力电缆的基础上提高了柔软性能,本发明制得的电缆能够满足GB 31247中B1级阻燃要求,在发生火灾时能减缓火势,避免了因燃烧产生大量的烟雾以及有毒有害气体,提高了安全性,给人员逃生和消防救援赢得宝贵的时间。
Description
技术领域
本发明涉及电缆技术领域,尤其是一种外护套及其制造工艺和具有该外护套的B1级低压交联电缆。
背景技术
目前我国对于电缆安全性能要求不断提升,为了提高电气线路的安全等级,减少电气火灾事故的发生及损失,国家建设部、公安部以及一些地方政府相继出台了一些电气设计规范,尤其是大数据机房用电线电缆的燃烧综合性能需要达到GB 31247-2014中B1级的要求。
然而,目前市场上用于大数据机房供电的电缆多为阻燃聚氯乙烯护套和低烟无卤阻燃电缆,其阻燃性能仅限于满足国标GB/T 19666-2005中阻燃的要求,无法满足现在新的规范要求,这些电缆在火灾发生时可能会释放出大量的热量,给人员逃生和消防救援带来很大的困难,可以说超柔用满足B1级性能要求的低压交联电力电缆目前在市面上仍属于空白。因此,开发出一种能够制造机械性能良好,且能够满足B1级阻燃要求的超柔用B1级低压交联电力电缆的制造工艺成为本领域技术人员努力的方向。
发明内容
本发明要解决的技术问题是:克服现有技术中之不足,提供一种外护套及其制造工艺和具有该外护套的B1级低压交联电缆。
本发明解决其技术问题所采用的技术方案是:一种外护套,所述外护套由如下重量份的原料制成:
进一步地,所述外护套由如下重量份的原料制成:
进一步地,所述外护套由如下重量份的原料制成:
进一步地,所述阻燃剂三氧化二锑的纯度≥99%,阻燃剂三氧化二锑的粒径为0.3~0.5μm。
进一步地,所述润滑剂为聚乙烯蜡或硬脂酸钙或硅类润滑剂的一种。
一种上述外护套的制造工艺,具体包括如下步骤:
S1、称取PVC树脂100~105份、增塑剂DINP30~32份、增塑剂DOTP35~38份、稳定剂7~8份、阻燃剂三氧化二锑6~8份、润滑剂聚乙烯蜡0.5~0.8份、加工助剂ACR1.6~1.8份、氢氧化铝30~32份、氢氧化镁20~25份、硼酸锌10~15份投入密炼机中,在密炼机中混炼至150℃,使各种组分均匀混合,形成混炼胶料;
S2、将S1制得的混炼胶料由锥形喂料斗引入双螺杆挤出机熔融挤出加工,然后经单螺杆挤出造粒,得到护套电缆料,备用;
S3、将S2所得护套电缆料通过挤塑机在一区125~135℃、二区135~155℃、三区150~170℃、四区155~175℃、机头150~170℃的温度下挤出得到外护套成品,该外护套成品包覆在电缆中第二绕包层外表面。
一种具有上述外护套的B1级低压交联电缆,具有第一绕包层,第一绕包层内腔设有若干绝缘线芯,第一绕包层外表面由内向外依次包裹有第一绕包层、隔氧层、金属铠装层、第二绕包层和外护套,第一绕包层内腔还填充有填充绳。
进一步地,所述绝缘线芯包括铜导体,铜导体外表面包裹有绝缘层,绝缘层外表面包裹有绝缘阻燃层。
进一步地,所述铜导体为不镀金属层的退火铜导体,铜导体的直径为0.15~0.20mm;所述隔氧层的厚度为1.5~3.5mm。
进一步地,所述绝缘层为交联聚乙烯绝缘料制得的绝缘层;绝缘阻燃层为低烟无卤层;填充绳为低烟无卤阻燃填充绳;第一绕包层为金云母带;第二绕包层为玻璃纤维包带绕包层;隔氧层为低烟无卤隔氧层;金属铠装层为双层镀锌钢带铠装层。
本发明的有益效果是:本发明结构简单,设计合理,具有以下优点:
(1)、本发明的外护套材料在阻燃剂三氧化二锑和氢氧化铝的基础上添加氢氧化镁和硼酸锌,构成复合阻燃体系,氢氧化铝和氢氧化镁进一步提高阻燃性能,提高氧指数,降低烟密度指数,硼酸锌的作用在于外护套在燃烧时能够形成连续致密的保护炭层,防止外护套爆裂,保护外护套内部组件;本发明制得的高阻燃聚氯乙烯外护套的氧指数达到36以上,在燃烧时具有良好的阻燃效果,能够形成连续致密的保护炭层,从而有效的提高了材料的防火阻燃性能,有效避免火灾的发生或蔓延;
(2)、本发明制得的高阻燃聚氯乙烯外护套,其机械物理性能显著提升,拉伸强度达20Mpa以上,断裂伸长率达200%以上,能够有效避免安装或使用过程中电缆由于受到过度弯曲、拉伸、扭转而影响电缆使用寿命的问题;
(3)、本发明中的电缆,其铜导体直径比常规电缆更细,提高了电缆弯曲性能,不局限于使用场所和柔软性;此外,其在隔氧层外表面设置了双层镀锌钢带铠装层,该铠装层能够防止电缆承受较大机械压力对电缆内部的损伤,进一步提高了电缆的使用寿命;同时还在铠装层外绕包了第二绕包层,该绕包层一方面对金属铠装层起到保护作用,防止外护套挤包进入铠装层内,另一方面也起到火灾时防止火焰纵向蔓延的作用;本发明中的电缆中设有外护套、隔氧层和绝缘阻燃层,从外向内形成三个防火组件,进一步提高防火性能;外护套有效提高防火阻燃性能,有效避免火灾的发生或蔓延;隔氧层具有隔热、降温,受热分解后结壳的效果,材料中填充有大量的水合氧化物,在受热时,水分子蒸发,可以吸收大量的热量,降低电缆的温度,形成的水蒸气可以冲淡电缆周围氧气的浓度,燃烧的金属氧化物产物形成硬壳,包覆在缆芯外,阻止火焰和热量向电缆内部蔓延和传递,在火灾情况下对保持电路完好的电性能起到一定作用;绝缘阻燃层能够阻止对铜导体的燃烧,短时间内保护铜导体,使得电缆能维持一段工作时间。
附图说明
下面结合附图和实施例对本发明进一步说明。
图1是本发明中电缆的结构示意图;
图中:1.绝缘线芯,11.铜导体,12.绝缘层,13.绝缘阻燃层,2.填充绳,3.第一绕包层,5.隔氧层,6.金属铠装层,7.第二绕包层,8.外护套。
具体实施方式
现在结合附图和优选实施例对本发明作进一步详细的说明。这些附图均为简化的示意图,仅以示意方式说明本发明的基本结构,因此其仅显示与本发明有关的构成。
一种外护套,由如下重量份的原料制成:
阻燃剂三氧化二锑的纯度≥99%,阻燃剂三氧化二锑的粒径为0.3~0.5μm。
润滑剂为聚乙烯蜡或硬脂酸钙或硅类润滑剂的一种。
一种上述外护套的制造工艺,具体包括如下步骤:
S1、称取PVC树脂100~105份、增塑剂DINP30~32份、增塑剂DOTP35~38份、稳定剂7~8份、阻燃剂三氧化二锑6~8份、润滑剂聚乙烯蜡0.5~0.8份、加工助剂ACR1.6~1.8份、氢氧化铝30~32份、氢氧化镁20~25份、硼酸锌10~15份投入密炼机中,在密炼机中混炼至150℃,使各种组分均匀混合,形成混炼胶料;
S2、将S1制得的混炼胶料由锥形喂料斗引入双螺杆挤出机熔融挤出加工,然后经单螺杆挤出造粒,得到护套电缆料,备用;
S3、将S2所得护套电缆料通过挤塑机在一区125~135℃、二区135~155℃、三区150~170℃、四区155~175℃、机头150~170℃的温度下挤出得到外护套成品,该外护套成品包覆在电缆中第二绕包层7外表面。
如图1所示的一种具有上述外护套的B1级低压交联电缆,具有第一绕包层3,第一绕包层3内腔设有若干绝缘线芯1,第一绕包层3外表面由内向外依次包裹有第一绕包层3、隔氧层5、金属铠装层6、第二绕包层7和外护套8,第一绕包层3内腔还填充有填充绳2。
绝缘线芯1包括铜导体11,铜导体11外表面包裹有绝缘层12,绝缘层12外表面包裹有绝缘阻燃层13。
铜导体11为GB 31247-2014中第6种不镀金属层的退火铜导体,铜导体11的直径为0.15~0.20mm;隔氧层5的厚度为1.5~3.5mm。
绝缘层12为交联聚乙烯绝缘料制得的绝缘层;绝缘阻燃层13为低烟无卤层;填充绳2为低烟无卤阻燃填充绳;第一绕包层3为金云母带;第二绕包层7为玻璃纤维包带绕包层;隔氧层5为低烟无卤隔氧层;金属铠装层6为双层镀锌钢带铠装层。
实施例1
一种外护套,由如下重量份的原料制成:
实施例2
一种外护套,由如下重量份的原料制成:
实施例3
一种外护套,由如下重量份的原料制成:
对比例1
一种外护套,由如下重量份的原料制成:
对比例2
一种外护套,由如下重量份的原料制成:
实施例1~3,对比例1~2制备的外护套性能检测数据如表1所示。
表1
由表1可知,本发明制备的外护套材料无论是拉伸强度和断裂伸长率,还是燃烧时的烟密度都显著优于对比例,该高阻燃聚氯乙烯材料用作电缆外护套时能够改善使用过程中电缆受到外界恶劣环境影响而使用寿命的问题,同时其燃烧时烟密度小,为救灾和逃生提供了宝贵的时间。
以上说明书中描述的只是本发明的具体实施方式,各种举例说明不对本发明的实质内容构成限制,所属技术领域的普通技术人员在阅读了说明书后可以对以前所述的具体实施方式做修改或变形,而不背离发明的实质和范围。
Claims (10)
1.一种外护套,其特征在于:所述外护套由如下重量份的原料制成:
2.根据权利要求1所述的外护套,其特征在于:所述外护套由如下重量份的原料制成:
3.根据权利要求1所述的外护套,其特征在于:所述外护套由如下重量份的原料制成:
4.根据权利要求1或2或3所述的外护套,其特征在于:所述阻燃剂三氧化二锑的纯度≥99%,阻燃剂三氧化二锑的粒径为0.3~0.5μm。
5.根据权利要求1或2或3所述的外护套,其特征在于:所述润滑剂为聚乙烯蜡或硬脂酸钙或硅类润滑剂的一种。
6.一种如权利要求1~5任一项所述外护套的制造工艺,其特征在于:具体包括如下步骤:
S1、称取PVC树脂100~105份、增塑剂DINP30~32份、增塑剂DOTP35~38份、稳定剂7~8份、阻燃剂三氧化二锑6~8份、润滑剂聚乙烯蜡0.5~0.8份、加工助剂ACR1.6~1.8份、氢氧化铝30~32份、氢氧化镁20~25份、硼酸锌10~15份投入密炼机中,在密炼机中混炼至150℃,使各种组分均匀混合,形成混炼胶料;
S2、将S1制得的混炼胶料由锥形喂料斗引入双螺杆挤出机熔融挤出加工,然后经单螺杆挤出造粒,得到护套电缆料,备用;
S3、将S2所得护套电缆料通过挤塑机在一区125~135℃、二区135~155℃、三区150~170℃、四区155~175℃、机头150~170℃的温度下挤出得到外护套成品,该外护套成品包覆在电缆中第二绕包层(7)外表面。
7.一种具有如权利要求1~5任一项所述外护套的B1级低压交联电缆,其特征在于:具有第一绕包层(3),第一绕包层(3)内腔设有若干绝缘线芯(1),第一绕包层(3)外表面由内向外依次包裹有第一绕包层(3)、隔氧层(5)、金属铠装层(6)、第二绕包层(7)和外护套(8),第一绕包层(3)内腔还填充有填充绳(2)。
8.根据权利要求7所述的B1级低压交联电缆,其特征在于:所述绝缘线芯(1)包括铜导体(11),铜导体(11)外表面包裹有绝缘层(12),绝缘层(12)外表面包裹有绝缘阻燃层(13)。
9.根据权利要求8所述的B1级低压交联电缆,其特征在于:所述铜导体(11)为不镀金属层的退火铜导体,铜导体(11)的直径为0.15~0.20mm;所述隔氧层(5)的厚度为1.5~3.5mm。
10.根据权利要求7所述的B1级低压交联电缆,其特征在于:所述绝缘层(12)为交联聚乙烯绝缘料制得的绝缘层;绝缘阻燃层(13)为低烟无卤层;填充绳(2)为低烟无卤阻燃填充绳;第一绕包层(3)为金云母带;第二绕包层(7)为玻璃纤维包带绕包层;隔氧层(5)为低烟无卤隔氧层;金属铠装层(6)为双层镀锌钢带铠装层。
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