| High wear-resistant conveyor belt is the domestic focus on the development of conveyor belt varieties in recent years,the annual market demand for high wear-resistant conveyor belt about 8 billion.With the development of national economy,it serves as a kind of indispensable transportation tools will be widely used in ports,power plants,port,iron ore,the ordinary conveyor belt often has been difficult to meet the performance requirements for these areas more and more strict,especially for a long time use of conveyor belt,the surface layer of ordinary conveyor belt cover glue for conveying material tend to cracking phenomena caused by serious wear and tear,This will cause economic losses and even safety accidents.Among them,the wear resistance of the conveyor belt surface covering glue will seriously affect the service life of the conveyor belt,which will seriously bring safety accidents.Considering the complex working environment,it is of great significance to develop the conveyor belt covering adhesive with high wear resistance.High wear resistant conveyor belt covering rubber can prolong the service life of the conveyor belt,and research and development of high wear resistant conveyor belt has become a development trend,market demand,improve the wear resistance of rubber products is also a hot issue in the field of tribology.This paper focuses on the performance and category of conveyor belt covering adhesive mentioned in conveyor belt standard GB/T 5752-2013.This topic uses natural rubber as the matrix material,because natural rubber has a wide source,low cost,excellent mechanical properties and other advantages are widely used in the conveyor belt field,automobile tire field.The structure and properties of natural rubber/butadiene rubber blends were studied by rubber-rubber blending matrix modification,filler system modification and graphene-filled natural rubber matrix modification,and the effects of different carbon black content and types on the properties of blends were studied.The effect of different go fractions and modified GO on the properties of rubber matrix was studied.The experimental results show that:(1)The natural rubber/butadiene rubber blend prepared by mechanical blending method,with the increase of butadiene rubber content,the vulcanization time of the blend is extended,the crosslinking density is increased,and the Payne effect is enhanced.When the blend ratio NR/BR=50/50,the mechanical properties of the blend are 19.5mpa,the elongation at break is440%,and the DIN wear is reduced to 92mm~3,which meets the requirements of the above standard.(2)The natural rubber/butadiene rubber blend reinforced by carbon black was prepared by mechanical blending method.When the carbon black was N234 and the addition amount was45,the tensile strength,elongation at break and wear resistance of natural rubber/butadiene rubber blend reached the standard.(3)Natural rubber/butadiene rubber nanocomposites reinforced with carbon black were prepared by adding different amount of GO.When the amount of GO was 2phr,the Payne effect of rubber nanocomposites weakened,which was conducive to the dispersion of rubber filler and improved the agglomeration of filler.The tensile strength decreased slightly but still reached 18MPa,and the elongation at break increased to 490%,an increase of 11%.Wear was reduced to 80mm~3,wear resistance increased by 13%,thermal conductivity increased by 12%.(4)By FTIR,Raman spectroscopy and TGA tests,it was proved that the vulcanization accelerator was successfully grafted onto the surface of GO and had a certain reducibility to GO.In addition,the coking time and vulcanization time of the rubber nanocomposites with modified GO are shortened,Payne effect is weakened,tensile strength is slightly improved,thermal conductivity is increased,and wear resistance is further improved. |
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