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采用硫酸酸解微晶纤维素(MCC)的方法制备了纳米微晶纤维素(NCC),并将其作为填料部分替代白炭黑(SiO2),制备了纳米微晶纤维素-白炭黑/天然橡胶((NCC-SiO2)/NR)复合材料。结果表明,NCC的加入在保持SiO2增强NR基本力学性能的同时,使压缩永久变形由11.4%下降到5.9%,压缩疲劳生热则由19.9℃下降至10.6℃。当NCC与SiO2的质量比为10∶20时,(NCC-SiO2)/NR复合材料的一级和六级龟裂屈挠次数分别由SiO2/NR的2.5×104、6.0×104次提高到7.0×104、1.2×105次;老化性能也优于SiO2/NR复合材料,老化后拉伸强度、撕裂强度及硬度分别上升了40%、21%和25%,永久变形下降了25%,拉伸强度和断裂伸长率则基本不变;动态力学性能测试结果表明,NCC与SiO2的质量比为0∶30～20∶10时,复合材料0℃的胶料抗湿滑性能tanδ基本不变,而60℃胶料的滚动阻力tanδ却由0.060下降至0.049。SEM结果表明:NCC-SiO2在NR的分散性优于SiO2,与NR基体界面结合更加紧密。
The nanocrystalline cellulose (NCC) was prepared by the acid hydrolysis of microcrystalline cellulose (MCC) and was used as filler to partially replace silica (SiO2) to prepare nanocrystalline cellulose - silica / Natural rubber ((NCC-SiO2) / NR) composites. The results show that the addition of NCC decreases the compressive permanent deformation from 11.4% to 5.9% while the compression fatigue heat decreases from 19.9 ℃ to 10.6 ℃ while maintaining the basic mechanical properties of NR. When the mass ratio of NCC to SiO 2 is 10:20, the flexural and flexural cracking numbers of first grade and sixth grade of (NCC-SiO 2) / NR composites increase from 2.5 × 10 4 and 6.0 × 10 4 times of SiO 2 / NR to 7.0 × 104,1.2 × 105 times. The aging performance is better than that of SiO2 / NR composites. After aging, the tensile strength, tear strength and hardness increased by 40%, 21% and 25% respectively, and the permanent deformation decreased by 25% Tensile strength and elongation at break are basically the same. The results of dynamic mechanical tests show that when the mass ratio of NCC to SiO2 is 0:30 ~ 20:10, the anti-slip performance tanδ of the compound 0 ℃ is basically unchanged , While the rolling resistance tanδ of 60 ℃ rubber decreased from 0.060 to 0.049. The SEM results show that the dispersibility of NCC-SiO2 in NR is better than that of SiO2, and the binding of NCC-SiO2 with NR matrix is more close.