Study Of The Preparation Of Nanosilica Composites And The Properties Of Nanosilica Composites Filled HNBR

The development of petroleum exploitation,automobile industry and aerospace industry has put forward higher performance requirements for widely used rubber materials.As an important method to improve the comprehensive properties of rubber,the research on rubber filling modification is becoming more and more mature.Silica has been widely used in the field of rubber filling and modification as a kind of high-efficiency and energy-saving rubber reinforcing filler.However,the surface of silica nanoparticles is easy to agglomerate in the rubber matrix because of its surface hydroxyl groups,which leads to the decrease of dispersion,and then affects the comprehensive properties of rubber composites.Therefore,the study of introducing additional nano-materials to prepare new nanosilica composites to improve the dispersion in rubber matrix and synergistically improve the comprehensive properties of rubber has become a hot research direction in rubber reinforcement.In this paper,nanosilica composites were prepared and applied in HNBR rubber based on precipitation method with two different nanomaterials.The dispersion of nanocomposites in rubber and their effects on the comprehensive properties of rubber were studied.The research are as follows:1.Multi-walled carbon nanotubes-silica(CNTs-silica)nanocomposites were prepared on the basis of the precipitation preparation method of silica and applied in HNBR to obtain CNTs-silica-HNBR composites.The interaction between CNTs and silica nanoparticles was proved by a series of characterizations.TEM characterization of CNTs-silica showed that the CNTs were uniformly coated with silica nanopartieles and the particle size ranged from 10 to 20 nm.The results show that CNTs-silica-HNBR composites have excellent reinforcing properties for HNBR and good dispersion in HNBR.When the diameter of CNTs is 20-30 nm,the mass percentage of CNTs in CNTs-silica is 4%,and the filler content is 50 phr in HNBR,the rubber composites reach the optimum comprehensive mechanical properties.The tensile strength,elongation at break,tear strength and hardness of the optimum rubber composites are all higher than those of commercial silica 1165 MP filled HNBR composites prepared under the same conditions.2.Graphitic carbon nitride-silica(C3N4-siliea)nanocomposites were prepared on the basis of the precipitation preparation method of silica and applied in HNBR to obtain C3N4-silica-HNBR composites.The characterization of C3N4-silica proved the interaction between C3N4 and that the silica nanoparticles are uniformly distributed among the layers of C3N4 and the particle size is about 10-20 nm.The prepared C3N4-silica?HNBR composites show excellent filler dispersion in the rubber matrix.When the mass percentage of C3N4 in C3N4-siliea is 6%and the filler content is 50 phr in HNBR.the rubber composites reach the optimum comprehensive mechanical properties,with the elongation at break higher than that of commercial silica 1165 MP filled HNBR composites prepared under the same conditions.And its mechanical properties such as tensile strength,tear strength,permanent set at break and hardness are also close to commercial silica 1165 MP filled HNBR.