3D打印材料的功能性对拓展3D打印应用具有重要作用。在掺混型丙烯腈-苯乙烯-丁二烯共聚物(ABS)制备过程中一次性添加多壁碳纳米管(MWCNTs)和苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS),可以制备SBS增韧掺混型ABS/MWCNTs导电3D打印耗材。将MWCNTs与SBS、ABS高胶粉、苯乙烯-丙烯腈共聚物(SAN)粉末预混后再进行双螺杆共混,可有效提高MWCNTs在复合材料中的均匀性。结果表明:增加MWCNTs含量可显著提高3D打印材料的导电性,当纳米管添加量为10%时,电导率达到0.87S/cm,但韧性变差。SBS加入可有效提高复合材料韧性,但MWCNTs的分散性、电导率、拉伸强度和弯曲强度等有所下降。SBS含量为30%时,复合材料综合性能最佳,制导电3D打印耗材,打印过程流畅。
The functionality of 3D printing materials is pivotal in broadening the applications of 3D printing.By incorporating multi-walled carbon nanotubes (MWCNTs) and styrene-butadiene-styrene (SBS) simultaneously during the preparation of blended acrylonitrile-butadiene-styrene (ABS),we successfully produced SBS-toughened blended ABS/MWCNTs conductive 3D printing consumables.MWCNTs were pre-mixed with SBS,ABS high rubber powder,and styrene-acrylonitrile (SAN) powder,and then twin-screw blended to effectively enhance the uniformity of MWCNTs in the composite material.The results showed that:increasing the MWCNTs content significantly improved the conductivity of the 3D printing material.When the nanotube addition was 10%,the conductivity reached 0.87S/cm,but the toughness deteriorated.Adding SBS effectively enhanced the toughness of the composite material,but the dispersion,conductivity,tensile strength,and bending strength of MWCNTs decreasd.When the SBS content was 30%,the composite material exhibited optimal comprehensive performance,making it suitable for producing conductive 3D printing consumables and ensuring a smooth printing process.
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