多元共混改性绝缘纸的制备及绝缘性能

Preparation and insulating properties of multiple mixed-modified insulating paper

为了研究有机填料和无机填料的共同作用对绝缘纸性能的影响,利用纳米原纤化纤维素包覆经盐酸多巴胺表面处理后的纳米二氧化钛(TiO_(2)),得到多元共混填料(PDA-TiO_(2)@NFC),然后将多元共混填料填充到纤维素绝缘纸中,制备了不同多元共混填料浓度改性的三明治结构绝缘纸,探究了多元共混填料改性绝缘纸的最佳浓度,分析了不同多元共混填料浓度改性绝缘纸的抗张强度、直流体积电阻率、击穿特性和空间电荷。结果表明:当多元共混填料浓度为0.5%时,改性绝缘纸的抗张强度相对于未改性绝缘纸提升了17.90%,油浸纸的交、直流击穿强度均提升了17%以上,并且能有效抑制空间电荷的注入,对直流体积电导率的影响不甚明显。利用此种方法制备的三明治结构绝缘纸,力学性能和电气强度提升效果显著,为协同提升绝缘纸的各项性能提供了参考。

In order to study the effect of organic and inorganic fillers on the performance of insulating paper, nano titanium dioxide(TiO_(2)) treated with dopamine hydrochloride was coated with nano-fibrillated cellulose to get a multiple mixed filler(PDA-TiO_(2)@NFC). Then the multiple mixed filler was filled into the cellulose insulating paper, and a sandwich structure insulating paper modified by different multiple mixed fillers was prepared. The optimal concentration of multiple mixed fillers was explored, and the tensile strength, DC volume resistivity, breakdown characteristics, and space charge of the modified insulating paper with different multiple mixed fillers were analyzed. The results show that when the multiple mixed fillers concentration is 0.5%, compared with the unmodified insulating paper, the tensile strength of the modified insulating paper increases by 17.90%, the AC and DC breakdown strentgh of oil-paper increase by more than 17%, and the injection of space charge can be effectively inhibited. The effect of multiple mixed fillers on the DC volume conductivity is not obvious. The mechanical properties and electric strength improvement of the sandwich structure insulating paper prepared using this method are significant, which provides reference for jointly improving the performance of insulating paper.