| Due to the tight oil market,the use of carbon black is restricted,and white carbon black,as a filler for the preparation of diverse raw materials,is gaining increasing attention.The hydroxyl groups on the surface of the white carbon black limit its dispersion in the styrene-butadiene rubber base.In the traditional dry filler compound process,there are problems such as difficulty in feeding colloids,high heat generation in the mixing process,poor filler dispersion,and large rolling resistance of the rubber compound.This paper mainly discusses the effect of hydrophobic modification of silica and agglomeration modification of styrene-butadiene latex on the application properties of composite materials.First,the coupling agent was used to modify the surface of the white carbon black powder.After hydrophobic analysis,the ESBR was filled and the composite material was characterized.In situ synthesis of KH550 modified white carbon black aqueous solution,wet composite technology filled with styrene-butadiene latex to prepare composite materials,and through the Mooney viscosity and vulcanization analysis of the mixed rubber,the Penn effect and dynamic mechanics of the vulcanized rubber Analysis of performance,hardness and mechanical properties.Using three coupling agents γ-methacryloxypropyltrimethoxysilane(KH570),γ-mercaptopropylethoxybis(propane-hexaethoxy-siloxane)(Si747)and Bis-(Y-triethoxysilylpropyl)tetrasulfide(Si69),surface modification of silica powder in ethanol solvent.Investigate the effects of modification time,modification temperature,pH and the number of coupling agents on the surface modification of white carbon black.The structure and modification effect of white carbon black before and after modification were characterized by infrared spectroscopy,thermal weight loss,nitrogen adsorption and desorption,contact angle,activation degree and sedimentation volume test.The results show that the modification effect of KH570 is better among the three coupling agents.14 phr of KH570 coupling agent,at 50℃ and pH 7,stirred for 6 h,modified hydrophobic silica powder obtained the best modification effect.The hydrophobic white carbon black powder modified by KH570 is prepared by dry mixing technology to prepare styrene-butadiene rubber composite material.By testing the Mooney viscosity and vulcanization properties of the compounded rubber,and then testing the Penn effect,dynamic mechanical properties,hardness and mechanical properties of the vulcanized rubber,it was analyzed that KH570 modified the silica powder to make the composite material Performance is slightly improved.The ESBR latex was agglomerated and agglomerated with the electrolyte agglomeration agent NaCl.The particle size of the styrene-butadiene latex was measured by laser particle size analyzer and the addition of the agglomeration agent was significantly increased.The in-situ modified precipitation white carbon black is prepared,and the prepared white carbon black aqueous solution is filled into the agglomerated ESBR latex by wet mixing technology.50 phr white carbon black and 32 phr carbon black were used as fillers,and the white carbon black was wet packed with agglomerated styrene-butadiene latex to prepare composite materials.By conducting Mooney viscosity and vulcanization tests on the compounded rubber,the vulcanized rubber was tested for Payne effect,mechanical properties,hardness,and dynamic mechanical properties.The comprehensive performance of the composite material prepared by 0.23%NaCl agglomerated ESBR wet method was compared.it is good.With 77 phr white carbon black and 5 phr carbon black as fillers,the white carbon black wet-filled agglomerated ESBR,and the mass fraction of NaCl in styrene-butadiene latex is 0.23%,the overall performance of the rubber compound as the tread material is better. |
