CN106867071A - 一种电缆填充料 - Google Patents
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Abstract
一种电缆填充料,属于一种电缆内的填充料。包括以下组分:低密度聚乙烯塑料;高密度聚乙烯塑料;聚丙烯塑料;石墨;发泡剂;阻燃剂。发泡剂,阻燃剂。采用本发明制得的电缆填充条具有成型稳定,能充分填充电缆空隙,保证了电缆成缆时外观的圆整;而且具有机械强度高,表面密封性好,防水、防潮、不易折断,密度小、阻燃性能好,经济适用等优点。
Description
技术领域
本发明涉及电缆领域,具体地说,是一种电缆内的填充料。
背景技术
目前市面上生产的传统中压电缆填充条主要有三种:交联聚乙烯废料挤制的扇形填充条;聚丙烯(PP)网格填充绳;聚氯乙烯或橡胶管填充条。这几种填充条由于其材质、配方或形状的原因,表现不尽如人意,总是或多或少存在缺陷。
发明内容
为解决上述问题,本发明提供了一种成型稳定,能充分填充电缆空隙,保证了电缆成缆时外观的圆整;而且具有机械强度高,表面密封性好,防水,不易折断,密度小、重量轻、阻燃性能好的一种电缆填充料。
为实现上述目的,本发明采用的方案是:
一种电缆填充料,其特征在于:以重量计包括以下组分:
A)低密度聚乙烯塑料20%-40%;所述低密度聚乙烯,是乙烯与少量高级α-烯烃(如丁烯-1、己烯-1、辛烯-1、四甲基戊烯-1等)在催化剂作用下,经高压或低压聚合而成的一种共聚物,密度处于0.915~0.940克/立方厘米之间。
B)高密度聚乙烯塑料25%-50%;所述高密度聚乙烯,是一种结晶度高、非极性的热塑性树脂。密度在0.94克/立方厘米以上
C)聚丙烯塑料25%-50%;
D)石墨0.2%-0.3%;
E)发泡剂0.04%-0.06%;
F)阻燃剂1%-2%。
发泡剂为偶氮二甲酰胺。
阻燃剂为氮磷膨胀型阻燃剂,还可以是氢氧化铝和氢氧化镁的混合物。
制备这种电缆填充条的方法,采用如下步骤:
A)将原材料各组分按配比混合均匀,装入挤塑机料斗;
B)原材料通过挤塑机生成熔融态的混合料;
C)向熔融态的混合料中充入气体;
D)将C)步骤得到的混合料经挤塑机出口处设置的外模定型得到电缆填充条;
E)将电缆填充条,依次通过70℃-90℃的热水槽和室温水槽,然后风干得到发泡度为50%--70%的电缆填充条成品。所述发泡度为50%--70%是指混合料经发泡后相同体积的成品,重量只有原来的50%--30%。
B)步骤中挤塑机的机筒温度控制在130℃--190℃之间。
C)步骤中充入的气体为惰性气体。
惰性气体是氮气。
充入气体是通过安装在挤塑机上的充气装置进行充气处理。
充气装置中的充气压力为3.0MPa~4.5MPa。
首先,本发明采用少量的发泡剂和上述配方的混合料,经挤塑机熔融后充入了氮气,就可得到发泡度为50%--70%的电缆填充条成品。由于本发明采用了物理发泡,因此降低了环境污染,节约了工序和原材料,产品的稳定性大大提高;其次,电缆填充条从外模出来后先通过70-90℃的热水槽,室温水槽,最后风干,这样进行阶段性冷却,因此了避免因骤冷,急剧收缩,影响产品性能、定型、外观,因此保证了产品成型稳定。
因此,采用本发明制得的电缆填充条具有以下优点:
1、具有良好的工艺性,形状稳定,能充分填充电缆空隙,保证了电缆成缆时外观的圆整度;
2、具有机械强度高,表面密封性好,防水,不易折断,密度小、重量轻、阻燃性能好等优点,在电缆填充条的空隙中剩余的氮气对阻燃也会起到相应的作用;
3、解决了低密度聚乙烯塑料、高密度聚乙烯塑料、聚丙烯塑料等废旧塑料的回收再利用问题,有效降低产品成本,是高压电缆生产理想的非吸湿性填充材料;
4、减少了以往复绕和烘干等电缆填充条加工工序,使电缆生产操作工艺相应简化,节约了大量的能源和人力,对改善工作环境,缩短生产周期,提高经济效益和产品质量都有很大帮助。
具体实施方式
实施例1
一种电缆填充料,其特征在于:以重量计包括以下组分:
A)低密度聚乙烯塑料20%;
B)高密度聚乙烯塑料50%;
C)聚丙烯塑料28.76%;
D)石墨0.2%;
E)发泡剂0.04%;
F)阻燃剂1%。
所述发泡剂为偶氮二甲酰胺。
所述阻燃剂为氮磷膨胀型阻燃剂。
制备上述电缆填充条的方法,采用如下步骤:
A)将原材料各组分按配比混合均匀,装入挤塑机料斗;
B)原材料通过挤塑机生成熔融态的混合料;
C)向熔融态的混合料中充入气体;
D)将C)步骤得到的混合料经挤塑机出口处设置的外模定型得到电缆填充条;
E)将电缆填充条,依次通过75±5℃的热水槽和室温水槽,然后风干得到发泡度为50%的电缆填充条成品。
所述B)步骤中挤塑机的机筒温度控制在150±20℃。
所述C)步骤中充入的气体是氮气。
所述充入气体是通过安装在挤塑机上的充气装置进行充气处理。
所述充气装置中的充气压力为3.25±0.25MPa。
实施例2
一种电缆填充料,其特征在于:以重量计包括以下组分:
A)低密度聚乙烯塑料40%;
B)高密度聚乙烯塑料30%;
C)聚丙烯塑料27.76%;
D)石墨0.2%;
E)发泡剂0.04%;
F)阻燃剂2%。
所述发泡剂为偶氮二甲酰胺。
所述阻燃剂为氮磷膨胀型阻燃剂。
制备上述电缆填充条的方法,采用如下步骤:
A)将原材料各组分按配比混合均匀,装入挤塑机料斗;
B)原材料通过挤塑机生成熔融态的混合料;
C)向熔融态的混合料中充入气体;
D)将C)步骤得到的混合料经挤塑机出口处设置的外模定型得到电缆填充条;
E)将电缆填充条,依次通过75±5℃的热水槽和室温水槽,然后风干得到发泡度为55%的电缆填充条成品。
所述B)步骤中挤塑机的机筒温度控制在155±20℃。
所述C)步骤中充入的气体是氮气。
所述充入气体是通过安装在挤塑机上的充气装置进行充气处理。
所述充气装置中的充气压力为3.5±0.5MPa。
实施例3
一种电缆填充料,其特征在于:以重量计包括以下组分:
A)低密度聚乙烯塑料30%;
B)高密度聚乙烯塑料40%;
C)聚丙烯塑料27.76%;
D)石墨0.2%;
E)发泡剂0.04%;
F)阻燃剂2%。
所述发泡剂为偶氮二甲酰胺。
所述阻燃剂为氮磷膨胀型阻燃剂。
制备上述电缆填充条的方法,采用如下步骤:
A)将原材料各组分按配比混合均匀,装入挤塑机料斗;
B)原材料通过挤塑机生成熔融态的混合料;
C)向熔融态的混合料中充入气体;
D)将C)步骤得到的混合料经挤塑机出口处设置的外模定型得到电缆填充条;
E)将电缆填充条,依次通过80±5℃的热水槽和室温水槽,然后风干得到发泡度为60%的电缆填充条成品。
所述B)步骤中挤塑机的机筒温度控制在160±20℃。
所述C)步骤中充入的气体是氮气。
所述充入气体是通过安装在挤塑机上的充气装置进行充气处理。
所述充气装置中的充气压力为4.0±0.5MPa。
Claims (7)
1.一种电缆填充料,其特征在于:以重量计包括以下组分:
A)低密度聚乙烯塑料 20%-40%;
B)高密度聚乙烯塑料 25%-50%;
C)聚丙烯塑料 25%-50%;
D)石墨 0.2%-0.3%;
E)发泡剂 0.04%-0.06%;
F)阻燃剂 1%-2%;
所述发泡剂为偶氮二甲酰胺;所述阻燃剂为氮磷膨胀型阻燃剂。
2.制备权利要求1所述一种电缆填充料的方法,其特征在于:采用如下步骤:
A)将原材料各组分按配比混合均匀,装入挤塑机料斗;
B)原材料通过挤塑机生成熔融态的混合料;
C)向熔融态的混合料中充入气体;
D)将C)步骤得到的混合料经挤塑机出口处设置的外模定型得到电缆填充条;
E)将电缆填充条,依次通过70-90℃的热水槽和室温水槽,然后风干得到发泡度为50%-70%的电缆填充条成品。
3.根据权利要求2所述的一种电缆填充料的制备方法,其特征在于:所述B)步骤中挤塑机的机筒温度控制在130-190℃之间。
4.根据权利要求3所述的一种电缆填充料的制备方法,其特征在于:所述C)步骤中充入的气体为惰性气体。
5.根据权利要求4所述的一种电缆填充料的制备方法,其特征在于:所述惰性气体是氮气。
6.根据权利要求2、3、4和5任意一项所述的一种电缆填充料的制备方法,其特征在于:所述充入气体是通过安装在挤塑机上的充气装置进行充气处理。
7.根据权利要求6所述的一种电缆填充料的制备方法,其特征在于:所述充气装置中的充气压力为3.0MPa-4.5MPa。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108017822A (zh) * | 2017-12-01 | 2018-05-11 | 安徽渡江电缆集团有限公司 | 一种电缆用填充材料 |
CN111704763A (zh) * | 2020-07-07 | 2020-09-25 | 广州敬信高聚物科技有限公司 | 一种化学发泡聚乙烯组合物及其制备方法和应用 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108017822A (zh) * | 2017-12-01 | 2018-05-11 | 安徽渡江电缆集团有限公司 | 一种电缆用填充材料 |
CN111704763A (zh) * | 2020-07-07 | 2020-09-25 | 广州敬信高聚物科技有限公司 | 一种化学发泡聚乙烯组合物及其制备方法和应用 |
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