Nanometer composite carbon black with ultrahigh sound insulation performance and preparation method thereof

The invention discloses a process for expanding internal cracks and surface holes of nanometer carbon black and improving the specific surface area and porosity of the nanometer carbon black by utilizing the foaming performance of P,P-oxo-diphenylsulfonylhydrazine and reduced-pressure distillation . Meanwhile, liquid carbon dioxide is used for cold impact on hot nanometer carbon black to form supercritical carbon dioxide, so the specific surface area and porosity of the supercritical carbon dioxide are further improved. The sound insulation performance of a prepared sound insulation coating is greatly improved by being matched with a matched construction method. 本发明公开了一种利用P,P-氧代双苯磺酰肼的发泡性能以及减压蒸馏，使纳米炭黑的内部裂隙和表面孔洞膨胀，提升比表面积和孔隙率的工艺方法。同时以液体二氧化碳对热的纳米炭黑进行冷冲击，再形成超临界态二氧化碳，其比表面积和孔隙率进一步提升，制得的隔音涂料配合匹配的施工方法，其隔音性能大幅提升。