CN114714687A - 一种不含卤素残留的石墨散热膜及其制备方法 - Google Patents

一种不含卤素残留的石墨散热膜及其制备方法 Download PDF

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CN114714687A
CN114714687A CN202210322853.1A CN202210322853A CN114714687A CN 114714687 A CN114714687 A CN 114714687A CN 202210322853 A CN202210322853 A CN 202210322853A CN 114714687 A CN114714687 A CN 114714687A
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杨云胜
郭颢
束国法
蒋伟良
陈玲
陶勇
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Anhui Carbon China New Material Technology Co ltd
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Abstract

本发明公开了一种不含卤素残留的石墨散热膜，包括位于上下面的柔性石墨膜和位于中部的聚酰亚胺支架，所述的聚酰亚胺支架呈波浪状，聚酰亚胺支架的上下凸起面均通过热接的方式与柔性石墨膜相连。该石墨散热膜从结构的方向进行改善，采用负压的方式增强柔性石墨膜与聚酰亚胺支架之间的连接强度，从而保证聚酰亚胺支架提供韧性变形基础，并通过波浪状的结构，赋予一定角度的柔性变形能力，且通过设计不同的波浪大小，可以赋予不同角度的柔性变形能力，以适用于不同的产品需求。

Description

一种不含卤素残留的石墨散热膜及其制备方法
技术领域
本发明涉及一种不含卤素残留的石墨散热膜及其制备方法。
背景技术
石墨散热膜作为一种金属散热材料的替代品，具有较强的导热能力以及较好的柔性变形能力，可以适用于多种小型电子产品的散热。
石墨散热膜在传统的加工生产中，存在很多胶水的使用，所以在石墨散热膜出厂检测时，会做卤素的含量测试，但是由于生产环节的限制，如果想做到低卤素或是不含卤素的话，往往要使用较为昂贵的胶水材料，且复合效果也大打折扣。
针对以上问题，现在有相关的探索方案，即设计更为合理的结构，从结构方面增强复合式石墨散热膜的连接强度，从而减少卤素的含量并提升连接强度。
同时，石墨散热膜在连接强度之外，还需要一定的柔性变形能力，从而可以在装配时，更好的贴合在待散热物体的表面，也需要一定的结构强度，来保证石墨散热膜不会产生断裂的情况。
那么设计一款合理结构的石墨散热膜，就可以综合的解决卤素含量以及柔性变形的问题，并且可以应用在人体表面的接触使用，如特种服饰的使用。且目前将石墨烯散热材料应用在特种服饰中，还未有较好的解决方案，就是既要满足人体对舒适度(柔性变形)的要求，也要保证石墨烯材料不会发生断裂(韧性需求)，同时，还要满足低卤素甚至是无卤素的需求。
发明内容
为了解决现有技术的不足，提出了一种不含卤素残留的石墨散热膜及其制备方法。
一种不含卤素残留的石墨散热膜，包括位于上下面的柔性石墨膜和位于中部的聚酰亚胺支架，所述的聚酰亚胺支架呈波浪状，聚酰亚胺支架的上下凸起面均通过热接的方式与柔性石墨膜相连。
进一步的，所述的聚酰亚胺支架的总高度为石墨散热膜总高的60％-80％。
一种不含卤素残留的石墨散热膜的制备方式，包括以下步骤：
S1、制备聚酰亚胺薄膜，并在聚酰亚胺薄膜上旋涂光刻胶；
S2、采用掩膜版对聚酰亚胺薄膜进行一二次曝光，其中曝光部分为正胶区域，未曝光区域为负胶区域；
S3、进行热烘，并使聚酰亚胺薄膜呈现波浪状变形；
S4、制备柔性石墨膜，并在柔性石墨膜的下表面涂覆粉末状的PEEK材料；
S5、通过热烘的方式，使得PEEK粉末熔融，并将其贴附在聚酰亚胺支架的表面；
S6、制备出符合要求的石墨散热膜，并对柔性石墨膜的外表面进行清洗与砂磨。
进一步的，为了保证使用时可以有一定的弯折能力，步骤S5之后，对初步粘合的石墨散热膜进行弯折实验，要求弯折角度大于35-45度，且弯折后柔性石墨膜与聚酰亚胺支架之间不产生断裂。
为了防止内部容腔在高温时发生膨胀，S6之后，采用聚四氟乙烯薄膜对石墨散热膜的两侧面进行封装，封装时，在石墨散热膜的内部空腔内充入呈负压状态的惰性气体。
进一步的，所述的惰性气体为氩气、氮气或是氦气。
有益效果：
该石墨散热膜从结构的方向进行改善，采用负压的方式增强柔性石墨膜与聚酰亚胺支架之间的连接强度，从而保证聚酰亚胺支架提供韧性变形基础，并通过波浪状的结构，赋予一定角度的柔性变形能力，且通过设计不同的波浪大小，可以赋予不同角度的柔性变形能力，以适用于不同的产品需求。
附图说明
图1是一种不含卤素残留的石墨散热膜；
图2是卤素含量报告一；
图3是卤素含量报告二；
图4是检测时的样片照片；
1.柔性石墨膜2.聚酰亚胺支架。
具体实施方式
为了加深对本发明的理解，下面将结合实施例和附图对本发明作进一步详述，该实施例仅用于解释本发明，并不构成对本发明保护范围的限定。
实施示例：
一种不含卤素残留的石墨散热膜，包括位于上下面的柔性石墨膜1和位于中部的聚酰亚胺支架2，所述的聚酰亚胺支架2呈波浪状，聚酰亚胺支架2的上下凸起面均通过热接的方式与柔性石墨膜1相连。聚酰亚胺支架2的总高度为石墨散热膜总高的70％。
上述不含卤素残留的石墨散热膜的制备方式，包括以下步骤：
S1、制备聚酰亚胺薄膜，并在聚酰亚胺薄膜上旋涂光刻胶；
S2、采用掩膜版对聚酰亚胺薄膜进行一二次曝光，其中曝光部分为正胶区域，未曝光区域为负胶区域；
S3、进行热烘，并使聚酰亚胺薄膜呈现波浪状变形；
S4、制备柔性石墨膜，并在柔性石墨膜的下表面涂覆粉末状的PEEK材料；
S5、通过热烘的方式，使得PEEK粉末熔融，并将其贴附在聚酰亚胺支架的表面，对初步粘合的石墨散热膜进行弯折实验，要求弯折角度大于35-45度，且弯折后柔性石墨膜与聚酰亚胺支架之间不产生断裂；
S6、制备出符合要求的石墨散热膜，并对柔性石墨膜的外表面进行清洗与砂磨，采用聚四氟乙烯薄膜对石墨散热膜的两侧面进行封装，封装时，在石墨散热膜的内部空腔内充入呈负压状态的氮气。
在人体服饰上使用时，可以将该石墨散热膜直接贴合在服饰的表面，从而为微小传感器，风机、芯片等部件进行散热处理。
作为进一步改进，以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (6)

1.一种不含卤素残留的石墨散热膜，其特征在于，包括位于上下面的柔性石墨膜和位于中部的聚酰亚胺支架，所述的聚酰亚胺支架呈波浪状，聚酰亚胺支架的上下凸起面均通过热接的方式与柔性石墨膜相连。
2.根据权利要求1所述的一种不含卤素残留的石墨散热膜，其特征在于，所述的聚酰亚胺支架的总高度为石墨散热膜总高的60％-80％。
3.一种不含卤素残留的石墨散热膜的制备方式，其特征在于，包括以下步骤：
S1、制备聚酰亚胺薄膜，并在聚酰亚胺薄膜上旋涂光刻胶；
S2、采用掩膜版对聚酰亚胺薄膜进行一二次曝光，其中曝光部分为正胶区域，未曝光区域为负胶区域；
S3、进行热烘，并使聚酰亚胺薄膜呈现波浪状变形；
S4、制备柔性石墨膜，并在柔性石墨膜的下表面涂覆粉末状的PEEK材料；
S5、通过热烘的方式，使得PEEK粉末熔融，并将其贴附在聚酰亚胺支架的表面；
S6、制备出符合要求的石墨散热膜，并对柔性石墨膜的外表面进行清洗与砂磨。
4.根据权利要求3所述的一种不含卤素残留的石墨散热膜的制备方式，其特征在于，步骤S5之后，对初步粘合的石墨散热膜进行弯折实验，要求弯折角度大于35-45度，且弯折后柔性石墨膜与聚酰亚胺支架之间不产生断裂。
5.根据权利要求3所述的一种不含卤素残留的石墨散热膜的制备方式，其特征在于，S6之后，采用聚四氟乙烯薄膜对石墨散热膜的两侧面进行封装，封装时，在石墨散热膜的内部空腔内充入呈负压状态的惰性气体。
6.根据权利要求5所述的一种不含卤素残留的石墨散热膜的制备方式，其特征在于，所述的惰性气体为氩气、氮气或是氦气。
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