The Experimental Study About Nano-Fe₃O₄ And Its Effect On Properties Of Natural Rubber

As a natural polymer compounds,natural rubber is widely used in many fields because of its comprehensive performance.But the natural rubber is a class of non-polar rubber,there are some performance defects in it.In order to obtain more excellent natural rubber products,natural rubber modification research gets more important significance and value.Nano-filler particles have surface effect,small size effect,quantum size effect and macroscopic quantum tunneling effects and other specificity,leading nano-filler modification to occupy a very important position in the natural rubber modification.Nano-Fe₃O₄ particles were selected as nano-fillers in this research.This research use natural rubber with relatively mature carbon black formula and white carbon black formula as the object of study.The effect of nano-Fe₃O₄ filler on the properties of natural rubber was studied by experiments.The main research of the performance of natural rubber includes vulcanization performance cross-linking density,physical and mechanical properties and thermal conductivity.The temperature field of rubber vulcanization process was simulated and analyzed by ANSYS software.The temperature field of rubber vulcanization process at different preheating temperatures and the temperature field of different parts of vulcanized rubber were studied.Research indicates:?1?The maximum torque and crosslinking density of the compound increases with the increase of nano-Fe₃O₄ filler,while the vulcanization time of the compound is reduced.The results show that Fe₃O₄ can improve the vulcanization effect of the compound,and the effect of Fe₃O₄ filler with 20 nm is the best when the dosage is12 Phr 15 Phr.?2?The smaller the particle size of nano-Fe₃O₄ filler,the greater the added amount,the stronger the Payne effect of natural rubber compound.It indicates that the smaller Fe₃O₄ nanoparticles and the dispersibility is less.?3?With the decrease of nano-Fe₃O₄ particle size,the 100% tensile stress,300%tensile stress,tensile strength and tear strength of the vulcanized rubber were increased,Indicating that the nano-Fe₃O₄ filler with small particle size has a relatively good effect on the reinforcing effect of natural rubber.Indicating that the nano-Fe₃O₄ filler with small particle size has a relatively good effect on the reinforcing effect of natural rubber.At the same time,with the addition of Fe₃O₄ filler,the above properties of the compound show a tendency to rise first and then decrease,and the physical and mechanical properties of the compound are best when the addition amount of Fe₃O₄ is20 Phr.?4?The thermal conductivity of the composites increases with the addition of nano-Fe₃O₄ filler,and the thermal conductivity of the Fe₃O₄ filler is higher than that of the Fe₃O₄ filler.?5?The temperature field simulation of the vulcanization process of rubber thick products shows that there is a large gap between the temperature rise rate inside and outside the rubber due to the relatively poor thermal conductivity of the rubber,thus reducing the uniformity of vulcanization.The nano-Fe₃O₄ filler can improve the thermal conductivity of the compound,thus reducing the gap to a certain extent.On the other hand,the improvement of the preheating temperature of the compound can also improve the vulcanization rate and the vulcanization uniformity.In this paper,the effects of nano-Fe₃O₄ filler size and the addition amount on the comprehensive properties of natural rubber were studied experimentally,which provided reference value for the application of nano-Fe₃O₄ filler in rubber material.