CN105524445A - 一种含改性纳米硅藻土-碳纳米管的pc-pet基led散热材料及其制备方法 - Google Patents
一种含改性纳米硅藻土-碳纳米管的pc-pet基led散热材料及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种含改性纳米硅藻土-碳纳米管的PC-PET基LED散热材料及其制备方法,该复合塑料以PC、PET等高分子材料复合作为导热塑料基料,并在其中掺混玻璃纤维、纳米氮化硅等填料,不仅增加了材料的综合力学性能,其耐热性、抗老化性能更佳,而其中掺混的经过离子液体改性的纳米硅藻土、碳纳米管复合粉体不仅能降低纳米粉体表面能,提高碳纳米管与硅藻土的结合性和分散性,提高硅藻土的导热性,降低生产成本,这种复合高导热粉体与高分子基料还具有良好的相容性,结合分布加料的工艺最终制成了具有互穿导热网络结构的复合材料,具备良好的传热、散热效果,其在LED封装中具有广阔的应用空间。
Description
技术领域
本发明涉及导热工程塑料技术领域,尤其涉及一种含改性纳米硅藻土-碳纳米管的PC-PET基LED散热材料及其制备方法。
背景技术
LED作为一代新型的光源,具有高效、节能、环保、使用寿命长、易于维护等等优点,被预为可取代白炽灯和荧光灯的第三代光源,LED的出光效率及寿命与芯片的工作温度具有直接的关系,散热问题是限制封装LED产品提高功率和发光效率的主要问题,解决LED散热问题的有效方式就是利用高导热、高绝缘、高透过率的材料将热量快速的传递出去。
目前LED封装常用的散热材料主要为金属铝材或陶瓷材料,这些材料在实际使用过程中均存在一些缺陷,比如铝基散热材料虽然具有较为优良的散热能力,但其存在成型工艺周期长、本身具有导电性以及造型单一等问题,而陶瓷材料虽然绝缘,但比重大、成型难度高,不利于批量生产,其应用也受到限制。
复合导热塑料近年来逐渐开始受到业内关注,首先塑料本身具有良好的绝缘、轻质、价廉、形状多样化等优势,在其中加入高导热性的填料后可获得较为满意的导热系数,其较之铝基散热材料质量更轻,成型周期更短,由于高导热性的填料单价较贵,而现有的制备工艺使得导热填料的利用率低,进一步提高了生产成本,因此,改善现有工艺,提高原料的利用率是寇待结果的问题。
发明内容
本发明目的就是为了弥补已有技术的缺陷,提供一种含改性纳米硅藻土-碳纳米管的PC-PET基LED散热材料及其制备方法。
本发明是通过以下技术方案实现的:
一种含改性纳米硅藻土-碳纳米管的PC-PET基LED散热材料,该复合塑料由以下重量份的原料制成:PC40-50、PET8-10、苯乙烯-丁二烯嵌段共聚物4-5、氟化钙0.1-0.2、纳米硅藻土8-10、纳米氮化硅15-18、玻璃纤维4-5、纳米氧化铁1-2、纳米二氧化铈0.1-0.2、低分子PE蜡2-3、六氟磷酸盐咪唑类离子液体1-1.5、多壁碳纳米管5-6、硅烷偶联剂1-2、抗氧剂0.5-0.6、光稳定剂0.1-0.2、去离子水30-40。
所述的一种含改性纳米硅藻土-碳纳米管的PC-PET基LED散热材料及其制备方法,所述的制备方法为:
(1)先将六氟磷酸盐咪唑类离子液体与去离子水混合,并油浴加热至50-60℃,随后恒温搅拌混合25-30min,随后升温至70-80℃,投入纳米硅藻土、多壁碳纳米管,恒温超声搅拌3-4h,搅拌结束后将所得物料完全干燥除去水分,所得粉体研磨分散后即得离子液体改性纳米硅藻土/碳纳米管复合粉体;
(2)将PC、PET、苯乙烯-丁二烯嵌段共聚物、纳米氮化硅、玻璃纤维、纳米二氧化铈、低分子PE蜡、抗氧剂、光稳定剂以及0.8-1重量份的硅烷偶联剂高速搅拌混合均匀后一起投入双螺杆挤出机中造粒,得到一次造粒料备用;
(3)将步骤(1)制备的复合粉体、其它剩余物料与剩余量的硅烷偶联剂搅拌混合均匀备用;
(4)将步骤(2)制备的一次造粒料通过主喂料口投入挤出机中,步骤(3)的复合粉体通过侧喂料口加入挤出机中,挤出造粒、冷却,即得用于注塑成型的复合导热材料。
本发明的优点是:本发明以PC、PET等高分子材料复合作为导热塑料基料,并在其中掺混玻璃纤维、纳米氮化硅等填料,不仅增加了材料的综合力学性能,其耐热性、抗老化性能更佳,而其中掺混的经过离子液体改性的纳米硅藻土、碳纳米管复合粉体不仅能降低纳米粉体表面能,提高碳纳米管与硅藻土的结合性和分散性,提高硅藻土的导热性,降低生产成本,这种复合高导热粉体与高分子基料还具有良好的相容性,结合分布加料的工艺最终制成了具有互穿导热网络结构的复合材料,具备良好的传热、散热效果,其在LED封装中具有广阔的应用空间。
具体实施方式
该复合材料由以下重量份的原料制成:PC40、PET8、苯乙烯丁二烯嵌段共聚物4、氟化钙0.1、纳米硅藻土8、纳米氮化硅15、玻璃纤维4、纳米氧化铁1、纳米二氧化铈0.1、低分子PE蜡2、六氟磷酸盐咪唑类离子液体1、多壁碳纳米管5、硅烷偶联剂1、抗氧剂0.5、光稳定剂0.1、去离子水30。
该复合塑料的制备方法为:
(1)先将六氟磷酸盐咪唑类离子液体与去离子水混合,并油浴加热至50℃,随后恒温搅拌混合25min,随后升温至70℃,投入纳米硅藻土、多壁碳纳米管,恒温超声搅拌3h,搅拌结束后将所得物料完全干燥除去水分,所得粉体研磨分散后即得离子液体改性纳米硅藻土/碳纳米管复合粉体;
(2)将PC、PET、苯乙烯丁二烯嵌段共聚物、纳米氮化硅、玻璃纤维、纳米二氧化铈、低分子PE蜡、抗氧剂、光稳定剂以及0.8重量份的硅烷偶联剂高速搅拌混合均匀后一起投入双螺杆挤出机中造粒,得到一次造粒料备用;
(3)将步骤(1)制备的复合粉体、其它剩余物料与剩余量的硅烷偶联剂搅拌混合均匀备用;
(4)将步骤(2)制备的一次造粒料通过主喂料口投入挤出机中,步骤(3)的复合粉体通过侧喂料口加入挤出机中,挤出造粒、冷却,即得用于注塑成型的复合导热材料。
本实施例所制得的复合导热材料的性能测试结果为:
项目 | 指标 |
拉伸强度(MPa) | 72.4 |
弯曲强度(MPa) | 194.5 |
导热率(w/mk) | 5.8 |
阻燃等级 | UL94-V0 |
体积电阻率(Ω.cm) | >1013 |
Claims (2)
1.一种含改性纳米硅藻土-碳纳米管的PC-PET基LED散热材料,其特征在于,该复合塑料由以下重量份的原料制成:PC40-50、PET8-10、苯乙烯-丁二烯嵌段共聚物4-5、氟化钙0.1-0.2、纳米硅藻土8-10、纳米氮化硅15-18、玻璃纤维4-5、纳米氧化铁1-2、纳米二氧化铈0.1-0.2、低分子PE蜡2-3、六氟磷酸盐咪唑类离子液体1-1.5、多壁碳纳米管5-6、硅烷偶联剂1-2、抗氧剂0.5-0.6、光稳定剂0.1-0.2、去离子水30-40。
2.如权利要求1所述的一种含改性纳米硅藻土-碳纳米管的PC-PET基LED散热材料及其制备方法,其特征在于,所述的制备方法为:
(1)先将六氟磷酸盐咪唑类离子液体与去离子水混合,并油浴加热至50-60℃,随后恒温搅拌混合25-30min,随后升温至70-80℃,投入纳米硅藻土、多壁碳纳米管,恒温超声搅拌3-4h,搅拌结束后将所得物料完全干燥除去水分,所得粉体研磨分散后即得离子液体改性纳米硅藻土/碳纳米管复合粉体;
(2)将PC、PET、苯乙烯-丁二烯嵌段共聚物、纳米氮化硅、玻璃纤维、纳米二氧化铈、低分子PE蜡、抗氧剂、光稳定剂以及0.8-1重量份的硅烷偶联剂高速搅拌混合均匀后一起投入双螺杆挤出机中造粒,得到一次造粒料备用;
(3)将步骤(1)制备的复合粉体、其它剩余物料与剩余量的硅烷偶联剂搅拌混合均匀备用;
(4)将步骤(2)制备的一次造粒料通过主喂料口投入挤出机中,步骤(3)的复合粉体通过侧喂料口加入挤出机中,挤出造粒、冷却,即得用于注塑成型的复合导热材料。
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CN110922735A (zh) * | 2019-11-11 | 2020-03-27 | 天津金发新材料有限公司 | 一种填充pc组合物及其制备方法 |
CN113563659A (zh) * | 2021-08-24 | 2021-10-29 | 胜利油田胜机石油装备有限公司 | 聚乙烯复合材料及其在制备耐高温内衬油管中的应用 |
CN114773731A (zh) * | 2022-04-29 | 2022-07-22 | 苏州润佳高分子材料有限公司 | 一种抗静电的聚丙烯塑料及其制备方法 |
CN115322641A (zh) * | 2022-08-25 | 2022-11-11 | 北京星驰恒动科技发展有限公司 | 一种高吸收率的杂散光抑制涂料及其制备方法和应用 |
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