The Preparation Of Nano-composites With Carbon Black Reinforced Natural Rubber Latex

The latex compounding technique was used to prepare nano-composites with carbon black (CB) reinforced natural rubber latex (NRL). The wet process can overcome some shortcomings of the traditional dry preparation process such as high pollution, high energy consumption, poor working environment, and at the same time the composites can obtain excellent mechanical properties. First hydrophilic carbon black suspensions was prepared by oxidation using ammonium persulfate (APS) as an oxidant. The function groups presented on the surface of modified carbon black (MCB) were characterized by Fourier transform infrared spectrometer (FTIR) and thermogravimetric test (TG). The particle size and dispersion stability of original CB and MCB were measured by a laser light scattering particle size analyzer and the UV-Vis spectrophotometer respectively. Then the natural rubber latex/modified carbon black composites were prepared by latex compounding through the stirring machine. The mechanical properties of vulcanizates were tested through the universal material test machine and the carbon black particles dispersed in rubber matrix by scanning electron microscopy (SEM). Finally, the Payne effect of filler network was used on the dynamic mechanical properties of products. The main research results are as follows:(1) The modified carbon black has excellent hydrophily, smaller partical size and good dispersion stability.(2) A better performance of natural rubber latex/modified carbon black composites was obtained by latex compounding technique. The reinforcement mainly is due to the fill-rubber interfacial interaction.(3) The filler network is the main factor to influence the dynamic viscoelastic properties of the vulcanizate filled with carbon black. The composites of NRL/MCB has higher loss factor(tan8) at low temperature, indicating better slip resistance and lower tan8 at high temperature, indicating better rolling resistance.