The Research Of Conductive Nitrile Rubber Composites Of Preparation And Properties

With the progress of society and the development of science and technology,the requirement of elastomer composite material is increasing.In the aspect of electric conduction,the conductive metal has been unable meet people's needs.At present,the requirements of conductive materials are not only conductive,but also great toughness and high elasticity.Therefore,the research on the new material's conductive rubber is imminent.With the development of nanophase materials,the traditional rubber materials are injected with fresh blood.The combination of new nanophase materials and traditional rubber materials can get better performance.Using the new type of carbon nanophase materials replaces or partially replaces the traditional materials to prepare NBR composites which has low filler,high strength,excellent electrical properties.It can receive a lot of attention by researchers.However the dispersion of carbon nanophase fillers in NBR is a very important problem.Based on the above situation,the author of this paper has carried out the research on the traditional materials and the research on that new nanophase materials replace the traditional materials.The main research is as follows.First of all,through the use of different vulcanization processes and different vulcanization systems to prepare different crosslinking structure of nitrile rubber composites,thus we obtained that the crosslinking structure can affect the NBR composites.Comparing with the nitrile rubber composites obtained under different vulcanization process and vulcanization systems,it is known that the nitrile rubber composites prepared by vulcanization at 160 ? has the best mechanical properties.Under this condition,the NBR composites were modified by adding different amount of plasticizer.However,it is concluded that the plasticizer DOP has no benefit to the mechanical properties of NBR composites.With the further research on the different content of aging agent,we can conclude that when the aging agent content is 4phr,the aging effect of NBR composites is better.And then using the different kinds of carbon black(three kinds of carbon black,conductive carbon black,super-conducting carbon black)filled in the nitrile rubber composites.Research shows that: acetylene black(powder)has the best thermal conductivity,the lowest compression fatigue temperature rise,the medium mechanical properties and the medium conductivity properties;mechanical properties of graphitized carbon black is best,but it has the lowest temperature conductivity,and it has the medium of compression fatigue temperature rise and the medium of conductivity properties;the conductive properties of superconducting carbon black is the best but the others properties is not very good;besides acetylene black 50 %,75 % of the performance is also general.Therefore,on the basis of the above research,we selected AB(powder)as the filler of nitrile rubber composites to research on the effect on the properties of vulcanized rubber composites with different portions(powder).The results show that the electrical conductivity,mechanical properties and compressive fatigue temperature rise of cross-linked rubber rise with the increase of acetylene carbon black's content.With the increase of the acetylene carbon black's content,the network connection among the fillers of NBR composites is better and better,and the interaction force between the rubber and the filler is increased and the amount of glue is also increased.When the content of CB is 40 phr,the conductive NBR composite has good electrical conductivity,which is 1.2×10-2 S/m.Its mechanical properties are: tensile strength 15.34 MPa,elongation 473.64 %,100 % modulus 2.39 MPa,300 % tensile stress 8.89 MPa,the tear strength 52.19 N/mm,and hardness 72.The thermal conductivity is 0.5115 W/m·K,and the compression fatigue temperature rises to 49.3 ?.We choose 40 phr as the basic carbon black filler,because with the increase of carbon content,NBR composite compression fatigue temperature rise increases,and when we added the 40 phr acetylene black,it has reached the percolation threshold conductive.Therefore we should use new carbon materials to further enhance the properties of NBR composites.On the basis of the above study,using a new type of carbon material GO replaces the acetylene black,and then through the latex co-precipitation method prepares functional filler masterbatch.Finally,using mechanical blending method combine the masterbatch and dry rubber to prepare NBR composites.To prepare NBR composites by GO instead of acetylene black,not only can improve the mechanical properties,electrical properties and so on,but also can be helpful to improve the dispersion of filler,and it reduces the NBR composite compression fatigue temperature rise and loss factor.