CN108276653A - 一种高电磁干扰屏蔽的热缩套管及其制备方法 - Google Patents

一种高电磁干扰屏蔽的热缩套管及其制备方法 Download PDF

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CN108276653A
CN108276653A CN201810077943.2A CN201810077943A CN108276653A CN 108276653 A CN108276653 A CN 108276653A CN 201810077943 A CN201810077943 A CN 201810077943A CN 108276653 A CN108276653 A CN 108276653A
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杨博瀚
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DALIAN UNION POLYMER MATERIAL Co Ltd
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Abstract

本发明涉及一种高电磁干扰屏蔽的热缩套管及其制备方法，属于功能性热缩套管技术领域。本发明所述高电磁干扰屏蔽的热缩套管，按重量份，由下述组分组成：40份低密度聚乙烯、30份乙烯‑醋酸乙烯酯共聚物、5份导电聚合物、0.5‑5份成核剂、0.2‑1份分散剂、1.5‑2.5份抗氧剂、1‑3份润滑剂、5‑10份阻燃剂、5‑15份屏蔽导电粉体。本发明所述高电磁干扰屏蔽的热缩套管通过导电聚合物包覆屏蔽导电粉体形成核‑壳结构，由于导电聚合物的导电性，使内部的屏蔽导电粉体更加不易发生电化学氧化，进而可以更加长久的保证产品电磁屏蔽性能的稳定性。

Description

一种高电磁干扰屏蔽的热缩套管及其制备方法
技术领域
本发明涉及一种高电磁干扰屏蔽的热缩套管及其制备方法，属于功能性热缩套管技术领域。
背景技术
随着电子科技的发展，一组电控设备中存在的电子元件越来越多，这也导致了各个电子元件间的电磁发射干扰就更加明显，近年来，热缩套管的用途也扩展到电磁屏蔽领域，但是，大多数电磁屏蔽护套都采用了导电碳粉、铁磁粉或涂覆导电膜等技术，而且，由于导电粉存在着重量比例不足时粉体分散不均匀，重量比例超出时无法得到合格的热缩套管，进而出现屏蔽能效低、物理性能不达标、电阻率高且不稳定等电学性能不合格及屏蔽范围窄的问题。同时，涂覆的电磁屏蔽管由于长期使用产生的刮擦导致屏蔽效果降低，无法保证电子元件的安全使用。
发明内容
本发明通过改进现有热缩套管的配方，解决了上述问题。
本发明提供了一种高电磁干扰屏蔽的热缩套管，所述高电磁干扰屏蔽的热缩套管，按重量份，由下述组分组成：
本发明优选为所述低密度聚乙烯的融熔指数为0.25g/10min；
所述乙烯-醋酸乙烯酯共聚物的融熔指数为2g/10min，其乙酸乙烯酯的含量为18％。
本发明所述导电聚合物优选为聚苯胺类导电聚合物。
本发明所述成核剂优选为硫酸钡类成核剂。
本发明所述分散剂优选为钛酸酯偶联剂。
本发明优选为所述抗氧剂为受阻酚类抗氧剂与有机亚磷酸酯的协效复合物；
所述受阻酚类抗氧剂与有机亚磷酸酯的重量比为33：67。
本发明所述润滑剂优选为氧化聚乙烯蜡润滑剂。
本发明所述阻燃剂优选为有机阻燃剂。
本发明所述屏蔽导电粉体优选为镍镀铜粉、银镀铜粉、镍粉、镍铁粉和镍包石墨粉中的至少一种。
本发明另一目的为提供一种上述热缩套管的制备方法，所述制备方法包括如下步骤：
①按预定重量份，将低密度聚乙烯、乙烯-醋酸乙烯酯共聚物、导电聚合物、成核剂、分散剂、抗氧剂、润滑剂、阻燃剂和屏蔽导电粉体混匀，制成热缩母料；
②将步骤①所得产品经挤出成型、电子加速器辐照交联、连续扩张成型，得到高电磁干扰屏蔽的热缩套管。
本发明所述高电磁干扰屏蔽的热缩套管，按重量份，由下述组分组成：40份低密度聚乙烯、30份乙烯-醋酸乙烯酯共聚物、5份导电聚合物、0.5-5份成核剂、0.2-1份分散剂、1.5-2.5份抗氧剂、1-3份润滑剂、5-10份阻燃剂、5-15份屏蔽导电粉体。本发明所述高电磁干扰屏蔽的热缩套管通过导电聚合物包覆屏蔽导电粉体形成核-壳结构，由于导电聚合物的导电性，使内部的屏蔽导电粉体更加不易发生电化学氧化，进而可以更加长久的保证产品电磁屏蔽性能的稳定性。
具体实施方式
下述非限制性实施例可以使本领域的普通技术人员更全面地理解本发明，但不以任何方式限制本发明。
下述低密度聚乙烯的融熔指数为0.25g/10min；
下述乙烯-醋酸乙烯酯共聚物的融熔指数为2g/10min，其乙酸乙烯酯的含量为18％；
下述导电聚合物为聚苯胺类导电聚合物，其作用为：同屏蔽导电粉体包覆形成导电粒子，增强主基材同屏蔽导电粉体的粘结力及导电性能，满足了产品的物理性能和屏蔽性能，解决了屏蔽导电粉体共混聚合物时，造成其物理性能和屏蔽性能下降的问题；
下述成核剂为硫酸钡类成核剂，其作用为：提高了低密度聚乙烯的成核效果，由于导电粒子主要存在于非结晶区，当结晶比例增大时，在填料用量相同的情况下，非结晶区的导电粒子含量就会增大，导电粒子之间的间隙就会减小，形成导电网络的几率就会增大；
下述分散剂为钛酸酯偶联剂，钛酸酯偶联剂又称表面处理剂，主要通过物理或化学的作用，使有机聚合物和无机物产生架桥作用，从而保证产品的力学性能；
下述抗氧剂为受阻酚类抗氧剂与有机亚磷酸酯的协效复合物，所述受阻酚类抗氧剂与有机亚磷酸酯的重量比为33：67；
下述润滑剂为氧化聚乙烯蜡润滑剂；
下述阻燃剂为有机阻燃剂。
实施例1
一种高电磁干扰屏蔽的热缩套管的制备方法，所述制备方法包括如下步骤：
①将40kg线性低密度聚乙烯、30kg乙烯-醋酸乙烯酯共聚物、5kg导电聚合物、3kg成核剂、1kg分散剂、1.5kg抗氧剂、1kg润滑剂、5kg阻燃剂、8kg镍镀铜粉先在搅拌机内搅拌20min，再在双螺杆造粒机内130℃挤出造粒，制成热缩母料；
②将热缩母料经挤出成型、电子加速器辐照交联、连续扩张成型，得到高电磁干扰屏蔽的热缩套管。
实施例2
一种高电磁干扰屏蔽的热缩套管的制备方法，所述制备方法包括如下步骤：
①将40kg线性低密度聚乙烯、30kg乙烯-醋酸乙烯酯共聚物、5kg导电聚合物、3kg成核剂、1kg分散剂、1.5kg抗氧剂、1kg润滑剂、5kg阻燃剂、10kg镍铁粉先在搅拌机内搅拌20min，再在双螺杆造粒机内130℃挤出造粒，制成热缩母料；
②将热缩母料经挤出成型、电子加速器辐照交联、连续扩张成型，得到高电磁干扰屏蔽的热缩套管。
实施例3
一种高电磁干扰屏蔽的热缩套管的制备方法，所述制备方法包括如下步骤：
①将40kg线性低密度聚乙烯、30kg乙烯-醋酸乙烯酯共聚物、5kg导电聚合物、3kg成核剂、1kg分散剂、1.5kg抗氧剂、1kg润滑剂、5kg阻燃剂、4kg银镀铜粉、8kg镍包石墨粉先在搅拌机内搅拌20min，再在双螺杆造粒机内130℃挤出造粒，制成热缩母料；
②将热缩母料经挤出成型、电子加速器辐照交联、连续扩张成型，得到高电磁干扰屏蔽的热缩套管。
上述实施例1-3制备的高电磁干扰屏蔽的热缩套管：同现有添加大量金属粉体导致力学性能下降、及力学性能合格但屏蔽效果差的同类产品相比，本产品具有更好的力学性能和电磁屏蔽性能；同现有同类产品相比，本产品在使用过程中，具有更高的屏蔽作用、更低的电阻率、更稳定均匀的屏蔽效果、频率范围更广的屏蔽效果及良好的物理性能，尽而保证电子元件的安全使用，避免出现安全隐患。
测试例1
实施例1-3制备的高电磁干扰屏蔽的热缩套管的测试结果如下：
拉伸强度≥15MPa；
断裂伸长率≥320％；
电磁屏蔽能效≥50db(230MHz≤f≤1GHz)；
表面电阻率≤103Ω/平方；
体积电阻率≤101Ω·cm；
热老化：158±1℃、168h后，拉伸强度(≥)12MPa，断裂伸长率(≥)270％；
热冲击：250±1℃、4h后，不滴不流；
低温柔性：-40±1℃、4h后，360°缠绕无裂纹。
符合无卤环保标准及欧盟RoHS环保指令的要求。

Claims (10)

1.一种高电磁干扰屏蔽的热缩套管，其特征在于：所述高电磁干扰屏蔽的热缩套管，按重量份，由下述组分组成：
2.根据权利要求1所述高电磁干扰屏蔽的热缩套管，其特征在于：所述低密度聚乙烯的融熔指数为0.25g/10min；
所述乙烯-醋酸乙烯酯共聚物的融熔指数为2g/10min，其乙酸乙烯酯的含量为18％。
3.根据权利要求2所述高电磁干扰屏蔽的热缩套管，其特征在于：所述导电聚合物为聚苯胺类导电聚合物。
4.根据权利要求3所述高电磁干扰屏蔽的热缩套管，其特征在于：所述成核剂为硫酸钡类成核剂。
5.根据权利要求4所述高电磁干扰屏蔽的热缩套管，其特征在于：所述分散剂为钛酸酯偶联剂。
6.根据权利要求5所述高电磁干扰屏蔽的热缩套管，其特征在于：所述抗氧剂为受阻酚类抗氧剂与有机亚磷酸酯的协效复合物；
所述受阻酚类抗氧剂与有机亚磷酸酯的重量比为33：67。
7.根据权利要求6所述高电磁干扰屏蔽的热缩套管，其特征在于：所述润滑剂为氧化聚乙烯蜡润滑剂。
8.根据权利要求7所述高电磁干扰屏蔽的热缩套管，其特征在于：所述阻燃剂为有机阻燃剂。
9.根据权利要求8所述高电磁干扰屏蔽的热缩套管，其特征在于：所述屏蔽导电粉体为镍镀铜粉、银镀铜粉、镍粉、镍铁粉和镍包石墨粉中的至少一种。
10.权利要求1、2、3、4、5、6、7、8或9所述热缩套管的制备方法，其特征在于：所述制备方法包括如下步骤：
①按预定重量份，将低密度聚乙烯、乙烯-醋酸乙烯酯共聚物、导电聚合物、成核剂、分散剂、抗氧剂、润滑剂、阻燃剂和屏蔽导电粉体混匀，制成热缩母料；
②将步骤①所得产品经挤出成型、电子加速器辐照交联、连续扩张成型，得到高电磁干扰屏蔽的热缩套管。
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CN113174118A (zh) * 2021-04-26 2021-07-27 中科院长春应化所黄埔先进材料研究院 一种具有电磁屏蔽功能的形状记忆高分子复合材料及其制备方法

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