CN103554900B - 一种含特殊结构碳纳米管填料的导热绝缘塑料及其制备方法 - Google Patents
一种含特殊结构碳纳米管填料的导热绝缘塑料及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种含特殊结构碳纳米管填料的导热绝缘塑料及其制备方法,通过在聚合物树脂中添加一种或多种无机粉末与特殊结构的碳纳米管混杂的填料制备具有导热绝缘功能的复合材料;采用特殊结构的碳纳米管能在确保大幅度提高复合材料导热性能的同时,避免了混杂碳系材料带来的导电性,拓展了含碳纳米管复合材料的应用;本发明制备方法工艺简单,对设备要求低,条件易控,成本低廉,适于工业化生产。
Description
技术领域
本发明属于导热绝缘塑料制备技术领域,具体涉及一种含特殊结构碳纳米管填料的导热绝缘塑料及其制备方。
背景技术
随着科学技术的进步,人们对导热材料的要求有了进一步的提高,质轻、易加工成型,抗冲击,耐化学腐蚀,耐热疲劳、优良的电绝缘性能和化学稳定性等都是人们对导热材料的新要求。相较于金属材料而言,高分子材料具有价格低廉、耐腐蚀、易成型、力学性能良好的优点,同时能通过注塑的方式制成各种形状的产品且无须二次成型及表面处理,大大降低了电子电器制品的成本。但高分子材料是热的不良导体,这大大限制了聚合物在导热领域的应用,通过在塑料中添加各类填料是最常用的制备导热塑料的方法。
选用金属,碳系填料是常用的导热填料,通过挤出造粒的方法可以制备具有导热性能的复合材料。如专利CN102746576A,CN101469109B,CN1605604都提及使用金属粉末、金属纤维能制备具有高热导率的复合材料,专利CN1438363,CN1242286,CN1584140都提及采用碳材料制备导热材料。此类导热材料多具有较高的热导率,但存在不绝缘的缺陷,大大限制了其使用范围。
选用不导电的无机填料制备导热绝缘复合材料是常用的方法,常见的有各类金属氧化物如氧化铝,氧化镍,氧化镁等,氮化物如氮化镁,氮化硼等,碳化物如碳化硼,碳化钛等。专利CN10735612B,CN101558577B,CN101899209B等均提及了使用此类无机填料制备的导热绝缘塑料,但此类导热材料具有热导率较低,平均热导率低于2W/m·k;复合材料需要在高填充量下才能实现导热,复合材料的流动性差,力学性能低的缺陷。
为解决现有困难,科研人员采用了多种手段来改善导热绝缘塑料的性能。如专利CN101280108A中提及采用普通填料与长玻纤混杂制备高力学性能的导热材料,专利CN1333801A介绍利用高的长径比碳纤维与低的长径比粉体填料按照一定比例进行混杂制备导热材料。这些利用不同长径比的材料进行混杂的填充方法虽能在一定程度上改善复合材料的力学性能,但对导热性能的影响有限。同时大量研究者力图使用碳纳米管改善复合材料的导热性能。碳纳米管作为新兴的纳米材料,其作为导热填料的使用已被各类文献广泛报道,特别是在低填充量下,复合材料的热导率能得到极大的提升而受到研究的关注。虽然此类导热塑料具有较高的热导率,但仍存在导电性高,高填充量下力学性能不足,价格昂贵的缺点。
基于以上,采用金属,碳材料作为导热填料虽能实现塑料基复合材料的高导热性,但无法克服非绝缘性带来的缺陷,大大限制了此类导热复合材料的应用范围;采用无机填料作为导热填料,虽能实现电绝缘,但导热效果较差,力学性能不足。未来,开发一种能实现高热导率的导热绝缘材料已成为发展的重要方向。
发明内容
本发明的目的是提供一种含特殊结构碳纳米管填料的导热绝缘塑料,其原料按质量份数构成为:聚合物树脂100份;无机粉末40~180份;特殊结构碳纳米管2~6份,偶联剂1~3份;润滑剂0.2~10份;抗氧剂0.1~0.2份。
所述的聚合物树脂是:尼龙6(PA6)、尼龙66(PA66)、尼龙46(PA46)、聚苯醚(PPO)、聚苯硫醚(PPS)、聚对苯二甲酸乙二醇酯(PET)、聚对苯二甲酸丁二醇酯(PBT)或丙烯腈-丁二烯-苯乙烯共聚物(ABS)。
所述的无机粉末是金属氧化物、氮化物、碳化物中的一种或几种的混合物;所述的金属氧化物是氧化铝(Al2O3)、氧化镁(MgO)、氧化锆(ZrO2)中的一种或几种的混合物;所述的氮化物是氮化铝(AlN)、氮化硅(Si3N4)、氮化硼(BN)中的一种或几种的混合物;所述的碳化物是碳化硅(SiC)、碳化硼(B4C)中的一种或几种的混合物;所述的无机粉体的平均粒径在5~20μm。
所述的特殊结构碳纳米管为一种以炭黑为内核,碳纳米管为外侧延伸物的多导热点的星形导热填料。其制备方法按照中国专利CN102911402A所述。
所述的偶联剂是γ-缩水甘油醚氧丙基三甲氧基硅烷(KH-560)、3-氨基丙基三乙氧基硅烷(KH-550)、二硬脂酰氧异丙基铝酸酯(F-1)、单烷氧基脂肪酸钛酸酯(NDZ-131)中的一种。
所述润滑剂是聚乙烯蜡、氧化聚乙烯蜡、石蜡、二硫化钼中的一种或几种;
所述抗氧剂是抗氧剂1010、抗氧剂168、抗氧剂B215中的一种或几种;
本发明还提供一种所述的含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
(1)原料预处理:将聚合物树脂、无机粉体及特殊结构碳纳米管加工前进行预烘干;
(2)混料:按比例将聚合物树脂、无机粉体、特殊结构碳纳米管、偶联剂、润滑剂和抗氧剂在高速搅拌机中搅拌均匀;
(3)造粒:将上述步骤混合好的原料放入双螺杆造粒机挤出造粒,造粒后经烘干而成导热绝缘塑料成品。
多导热点的星形导热填料的制备方法按照中国专利CN102911402A所述。
一种具有多导热点的星形导热填料的制备方法,包括如下步骤:
1)炭黑、碳纳米管表面处理
将炭黑、碳纳米管表面羧基化处理:选用强酸将炭黑、碳纳米管羧化;
2)碳纳米管表面接枝及水解处理
用硅烷偶联剂对氧化碳纳米管粉末进行表面处理,在二亚胺类物质的作用下使硅烷偶联剂接枝到碳纳米管表面;
将硅烷偶联剂接枝的碳纳米管在乙醇溶液中水解,使碳纳米管表面带羟基;
3)星形导热填料的制备及纯化
将水解后带羟基的碳纳米管与表面带羧基的炭黑在二亚胺类物质作用下反应2~6小时;
将制备的粉末在二甲苯中回流,并过滤,除去未反应的炭黑、碳纳米管。
上述步骤1)中,炭黑、碳纳米管的表面处理的方法为,在氮气气氛中,将炭黑、碳纳米管分别用强酸进行氧化处理,炭黑、碳纳米管与强酸的质量比分别为1:10~20和1:5~15,在60~100℃下氧化0.5~4小时;所述炭黑为炉法炭黑、槽法炭黑或热裂解炭黑中的一种;碳纳米管为多壁碳纳米管、单壁碳纳米管中的一种;使用的强酸为浓硝酸、浓硫酸、浓盐酸或双氧水。
将炭黑、碳纳米管分别用强酸进行氧化后获得的粉末采用乙醇或四氢呋喃或二氯甲烷或二甲苯中回流2~6小时后,收集该氧化粉末。
在将粉末氧化之前,将炭黑、碳纳米管粉末先进行分散处理;该分散处理的方法为:将粉末置于强酸中,再超声处理1~2小时。
上述步骤2)中,将硅烷偶联剂接枝到氧化碳纳米管粉末表面的方法为:在氮气气氛中,将硅烷偶联剂、氧化碳纳米管与N,N-二环己基碳二亚胺(DCC),或N,N'-二异丙基碳二亚胺(DIC),或1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐(EDC)按照1:1:0.2~0.5的质量比混合,并在温度为50~80℃下进行接枝反应0.5~4小时;所述硅烷偶联剂为γ-氨丙基三甲氧基硅烷(KH540)、γ-三丙基乙氧基硅烷(KH550)或γ-巯丙基三甲氧基硅烷(KH580)。
上述步骤2)中,将接枝碳纳米管进行水解的方法为:将接枝后获得的接枝碳纳米管在乙醇的水溶液中溶解,乙醇的水溶液是由无水乙醇与去离子水按照体积比5~1:1~5配置,在超声仪中振荡分散2~4小时,干燥后获得水解碳纳米管。
上述步骤3)中,将水解后的接枝碳纳米管与氧化炭黑反应生成星形导热填料的方法为:在氮气气氛中,将水解后碳纳米管、羧基化炭黑与N,N-二环己基碳二亚胺(DCC),或N,N'-二异丙基碳二亚胺(DIC),或1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐(EDC)按照1~8:1:0.2~0.5的质量比混合,并在温度为50~80℃下进行接枝反应0.5~4小时。
与已有技术相比,本发明的有益效果体现在:
本发明在添加特殊结构碳纳米管后,导热复合材料的导热系数明显提高,所得的导热材料的热导率高于4W/m·K。
本发明导热复合材料中添加了具有导电性的碳纳米管材料,但复合材料本身具有优异的电绝缘性。
本发明导热复合材料在具有较高的导热性能的同时具有优良的力学性能和加工性能。
附图说明
下面将结合附图及实施例对本发明作进一步说明,附图中:
图1为本发明实施例9中样品的扫面电镜图;
表1为实施例9,对比例1、2、3、4的性能对比。
具体实施方式
为了使本发明要解决的技术问题、技术方案及有益效果更加清楚明白,以下结合实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
现以具体导热绝缘塑料制备方法为例,对本发明进行进一步详细说明。
实施例1
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S11将PA6,平均粒径10μm的Al2O3,特殊结构的碳纳米管(以下简称S-CNTs)分别在110℃,80℃真空干燥4小时;
S12按质量份计,取PA6100份,Al2O3100份,S-CNTs6份,KH-5601份,聚乙烯蜡4份,抗氧剂10100.1份在高速搅拌机中搅拌1小时;
S13:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为4.7W/m·K,表面电阻为1.6×1012Ω,体积电阻为1.9×1012Ω·cm,熔融指数为4.2g/10min,冲击强度为56.7KJ/m2,综合性能良好。
实施例2
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S21将PA66,平均粒径8μm的MgO,S-CNTs分别在110℃,80℃真空干燥4小时;
S22按质量份计,取PA66100份,MgO40份,S-CNTs2份,KH-5502份,氧化聚乙烯蜡1份,抗氧剂1680.2份在高速搅拌机中搅拌1小时;
S23:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为4.1W/m·K,表面电阻为3.3×1012Ω,体积电阻为3.4×1012Ω·cm,熔融指数为3.2g/10min,冲击强度为62.5KJ/m2,综合性能良好。
实施例3
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S31将PA46,平均粒径15μm的ZrO2,S-CNTs分别在110℃,80℃真空干燥4小时;
S32按质量份计,取PA46100份,ZrO2160份,S-CNTs3份,F-13份,石蜡8份,抗氧剂B2150.2份在高速搅拌机中搅拌1小时;
S33:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为6.9W/m·K,表面电阻为1.1×1013Ω,体积电阻为1.5×1013Ω·cm,熔融指数为2.1g/10min,冲击强度为32.1KJ/m2,综合性能良好。
实施例4
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S41将PPO,平均粒径20μm的AlN,S-CNTs分别在110℃,80℃真空干燥4小时;
S42按质量份计,取PPO100份,AlN80份,S-CNTs6份,NDZ-1313份,二硫化钼4份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
S43:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为5.7W/m·K,表面电阻为3.1×1012Ω,体积电阻为3.9×1012Ω·cm,熔融指数为2.9g/10min,冲击强度为38.1KJ/m2,综合性能良好。
实施例5
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S51将PPS,平均粒径10μm的Si3N4,S-CNTs分别在110℃,80℃真空干燥4小时;
S52按质量份计,取PPS100份,Si3N4140份,S-CNTs6份,KH-5503份,氧化聚乙烯蜡4份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
S53:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为7.2W/m·K,表面电阻为4.1×1012Ω,体积电阻为5.8×1012Ω·cm,熔融指数为1.5g/10min,冲击强度为41.8KJ/m2,综合性能良好。
实施例6
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S61将PET,平均粒径16μm的BN,S-CNTs分别在110℃,80℃真空干燥4小时;
S62按质量份计,取PET100份,BN150份,S-CNTs5份,KH-5603份,聚乙烯蜡2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
S63:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为6.4W/m·K,表面电阻为3.1×1012Ω,体积电阻为5.8×1012Ω·cm,熔融指数为2.2g/10min,冲击强度为38.4KJ/m2,综合性能良好。
实施例7
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S71将PBT,平均粒径16μm的SiC,S-CNTs分别在110℃,80℃真空干燥4小时;
S72按质量份计,取PBT100份,SiC70份,S-CNTs3份,F-13份,二硫化钼2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
S73:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为4.4W/m·K,表面电阻为1.1×1012Ω,体积电阻为1.8×1012Ω·cm,熔融指数为2.4g/10min,冲击强度为27.3KJ/m2,综合性能良好。
实施例8
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S71将ABS,平均粒径6μm的B4C,S-CNTs分别在110℃,80℃真空干燥4小时;
S82按质量份计,取ABS100份,B4C90份,S-CNTs6份,NDZ-1313份,石蜡2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
S83:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为4.8W/m·K,表面电阻为3.2×1012Ω,体积电阻为4.8×1012Ω·cm,熔融指数为3.3g/10min,冲击强度为41.2KJ/m2,综合性能良好。
实施例9
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S91将PA6,平均粒径20μm的MgO,平均粒径5μm的SiC,S-CNTs分别在110℃,80℃真空干燥4小时;
S92按质量份计,取PA6100份,MgO50份,SiC50份,S-CNTs6份,KH-5503份,氧化聚乙烯蜡2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
S93:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为8.4W/m·K,表面电阻为4.1×1012Ω,体积电阻为5.8×1012Ω·cm,熔融指数为2.2g/10min,冲击强度为31.3KJ/m2,综合性能最好。
实施例10
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S101将ABS,平均粒径10μm的BN,平均粒径20μm的AlN,S-CNTs分别在110℃,80℃真空干燥4小时;
S102按质量份计,取ABS100份,BN70份,AlN80份,S-CNTs6份,F-13份,二硫化钼2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
S103:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为7.4W/m·K,表面电阻为1.1×1012Ω,体积电阻为1.4×1012Ω·cm,熔融指数为2.4g/10min,冲击强度为37.3KJ/m2,综合性能良好。
实施例11
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S111将PPS,平均粒径5μm的BN,平均粒径20μm的MgO,S-CNTs分别在110℃,80℃真空干燥4小时;
S112按质量份计,取PPS100份,BN80份,MgO80份,S-CNTs6份,F-13份,氧化聚乙烯蜡2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
S113:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为8.1W/m·K,表面电阻为2.1×1012Ω,体积电阻为2.4×1012Ω·cm,熔融指数为1.7g/10min,冲击强度为32.3KJ/m2,综合性能良好。
实施例12
一种含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,包括以下步骤:
S121将ABS,平均粒径10μm的MgO,平均粒径20μm的SiC,S-CNTs分别在110℃,80℃真空干燥4小时;
S102按质量份计,取ABS100份,MgO50份,SiC30份,S-CNTs6份,F-13份,二硫化钼2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
S123:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为5.9W/m·K,表面电阻为1.7×1012Ω,体积电阻为2.4×1012Ω·cm,熔融指数为3.1g/10min,冲击强度为37.9KJ/m2,综合性能良好。
对比实施例1
一种导热绝缘塑料的制备方法,包括如下步骤:
D11将PA6,平均粒径20μm的MgO,平均粒径5μm的SiC分别在110℃,80℃真空干燥4小时;
D12按质量份计,取PA6100份,MgO50份,SiC50份,KH-5503份,氧化聚乙烯蜡2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
D13:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为4.7W/m·K,表面电阻为4.4×1012Ω,体积电阻为4.8×1012Ω·cm,熔融指数为2.4g/10min,冲击强度为38.3KJ/m2。
对比实施例2
一种导热绝缘塑料的制备方法,包括如下步骤:
D21将PA6,平均粒径20μm的MgO,平均粒径5μm的SiC,炭黑分别在110℃,80℃真空干燥4小时;
D22按质量份计,取PA6100份,MgO50份,SiC50份,炭黑6份,KH-5503份,氧化聚乙烯蜡2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
D23:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为4.7W/m·K,表面电阻为3.4×1011Ω,体积电阻为3.8×1011Ω·cm,熔融指数为1.3g/10min,冲击强度为29.3KJ/m2。
对比实施例3
一种导热绝缘塑料的制备方法,包括如下步骤:
D31将PA6,平均粒径20μm的MgO,平均粒径5μm的SiC,碳纳米管分别在110℃,80℃真空干燥4小时;
D32按质量份计,取PA6100份,MgO50份,SiC50份,碳纳米管6份,KH-5503份,氧化聚乙烯蜡2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
D33:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为4.9W/m·K,表面电阻为1.8×108Ω,体积电阻为2.3×108Ω·cm,熔融指数为1.5g/10min,冲击强度为30.1KJ/m2。
对比实施例4
一种导热绝缘塑料的制备方法,包括如下步骤:
D41将PA6,平均粒径20μm的MgO,平均粒径5μm的SiC,炭黑,碳纳米管分别在110℃,80℃真空干燥4小时;
D42按质量份计,取PA6100份,MgO50份,SiC50份,炭黑1.5份,碳纳米管4.5份,KH-5503份,氧化聚乙烯蜡2份,抗氧剂1010,抗氧剂168共0.2份在高速搅拌机中搅拌1小时;
D43:用双螺杆挤出机,挤出造粒,挤出后在80℃下烘干12小时成品。
该导热绝缘塑料制样后测试的热导率为5.5W/m·K,表面电阻为7.4×106Ω,体积电阻为8.8×106Ω·cm,熔融指数为1.1g/10min,冲击强度为27.3KJ/m2。
性能测试实验:
选用实施效果最佳的实施例9与对比实施例1、2、3、4做了各项性能指标的对比,对本发明进行进一步的说明。
表1
图1给出了添加特殊结构碳纳米管(S-CNTs)复合材料的SEM图,可以看出,这种含有多导热点的填料能在材料内部均匀分散,同时能有效形成多导热点链接,少量掺杂能大幅度提高复合材料的导热性能。
表1给出了最佳实施例与各对比例在各项性能上的对比情况。其中对比例1是只添加无机粉体的样品,对比例2为掺杂等质量份炭黑的样品,对比例3是添加等质量份碳纳米管的样品,对比例4为按照S-CNTs比例简单混合掺杂炭黑、碳纳米管的样品。
从表1可以看出,对比例中各样品的热导率明显低于使用S-CNTs的样品,最佳实施例9的热导率相较对比例1提高了78%,而直接混合的样品(对比例4)只提高了14%。从样品的介电性能来看,添加了S-CNTs后样品的表面电阻和体积电阻均未发生明显变化,但直接添加等比例的炭黑、碳纳米管,样品的表面电阻和体积电阻均明显减小。同时样品的流动性和力学性能减弱明显,说明采用S-CNTs作为掺杂物,再大幅提高热导率的同时,能维持样品的绝缘性能不变。
由上述性能测试分析的结果可知,本发明实施例导热绝缘塑料的制备方法,即可获得多导热绝缘塑料,能获得具有高热导率的绝缘材料,同时能维持原有力学性能。另外,复合材料的制备方法工艺简单,对设备要求低,条件易控,成本低廉,适于工业化生产。
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、等同替换和改进等,均应包含在本发明的保护范围之内。
Claims (5)
1.一种含特殊结构碳纳米管填料的导热绝缘塑料,其特征在于:其原料按质量份数构成为:聚合物树脂100份;无机粉末40~180份;特殊结构碳纳米管2~6份,偶联剂1~3份;润滑剂0.2~10份;抗氧剂0.1~0.2份;所述的无机粉末是金属氧化物、氮化物、碳化物中的一种或几种的混合物;所述的金属氧化物是氧化铝、氧化镁、氧化锆中的一种或几种的混合物;所述的氮化物是氮化铝、氮化硅、氮化硼中的一种或几种的混合物;所述的碳化物是碳化硅、碳化硼中的一种或几种的混合物;所述的无机粉体的平均粒径在5~20μm;所述的特殊结构碳纳米管为一种以炭黑为内核,碳纳米管为外侧延伸物的多导热点的星形导热填料;所述润滑剂是聚乙烯蜡、氧化聚乙烯蜡、石蜡、二硫化钼中的一种或几种。
2.根据权利要求1所述的导热绝缘塑料,其特征在于:所述的聚合物树脂是:尼龙6、尼龙66、尼龙46、聚苯醚、聚苯硫醚、聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二醇酯或丙烯腈-丁二烯-苯乙烯共聚物。
3.根据权利要求1所述的导热绝缘塑料,其特征在于:所述的偶联剂是γ-缩水甘油醚氧丙基三甲氧基硅烷、3-氨基丙基三乙氧基硅烷、二硬脂酰氧异丙基铝酸酯、单烷氧基脂肪酸钛酸酯中的一种。
4.根据权利要求1所述的导热绝缘塑料,其特征在于:所述抗氧剂是抗氧剂1010、抗氧剂168、抗氧剂B215中的一种或几种。
5.一种权利要求1所述的含特殊结构碳纳米管填料的导热绝缘塑料的制备方法,其特征在于包括以下步骤:
(1)原料预处理:将聚合物树脂、无机粉体及特殊结构碳纳米管加工前进行预烘干;
(2)混料:按比例将聚合物树脂、无机粉体、特殊结构碳纳米管、偶联剂、润滑剂和抗氧剂在高速搅拌机中搅拌均匀;
(3)造粒:将上述步骤混合好的原料放入双螺杆造粒机挤出造粒,造粒后经烘干而成导热绝缘塑料成品。
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