含铁剪切增稠流体含浸芳纶复合织物防刺及电磁屏蔽性能研究

Puncture resistance and electromagnetic shielding performance of aramid composite fabrics impregnated with STF-Fe

为满足屏蔽电磁波干扰的防刺服需求,利用超声波振荡法将分散相粒径为100nm的SiO_2与聚乙二醇(PEG)200配制成剪切增稠液体(STF),利用浸渍法制成STF/芳纶复合织物。在SiO_2质量分数为15%的STF中加入平均粒径为2.75m的Fe粉,制成铁粉质量分数分别为5%、10%、15%和18%的STF-Fe非牛顿流体,研究了SiO_2含量以及Fe粉固含量对复合织物防刺性能以及STF-Fe分散体系对电磁屏蔽的影响。结果表明,复合织物的防刺效果随着SiO_2、Fe含量的增加而增强。SiO_2质量分数大于15%时,复合织物的刀刺载荷明显提高。STF-Fe分散体系可以显著提高芳纶织物的刀刺性能,但效果不如STF。随着SiO_2含量的增加,STF/芳纶复合材料的防刺效果明显提高;在SiO_2质量分数为15%的条件下,随着Fe含量的增加,STF-Fe/芳纶复合织物的锥刺性能明显提高。当STF-Fe分散体系中Fe质量分数达到40%时,电磁屏蔽率可达到90%~99.9%。

In order to make puncture-resisting armor with electromagnetic shielding property,an ultrasonic vibration method was employed to disperse 100 nm SiO2 and PEG 200 into shear thickening liquid（STF）,and then fabricated into STF/aramid composite fabric using an impregnation method.2.75 m Fe was added into STF containing15% SiO2,STF-Fe non-Newtonian fluid with different solid contents of Fe（5%,10%,15% and 18%）was formed.The effects of SiO2 and Fe contents on puncture resistance as well as the effect of Fe content on electromagnetic shielding were studied.Research results showed that,puncture resistance increased obviously with increasing SiO2 and Fe contents.When the content of SiO2 was more than 15%,the knife resistance was improved more significantly.STF-Fe can obviously increased the knife resistance,but the enhancing effect was less than the same solid content of STF.Stab resistance of STF/aramid fabric was obviously enhanced with increasing SiO2 content.When 15% SiO2 contained in STF-Fe,the spike resistance received an obvious increment with increasing Fe content.When Fe content reached 40%,the electromagnetic shielding efficiency attained 90%~99.9%.