Study On Antioxidation Mechanism Of Antioxidants With High Performance And Evaluation Of Their Performance In Rubber

In today's society,people's production and life are increasingly inseparable from various polymer materials.Rubber materials are indispensable in polymer materials because of their high elasticity.The status of rubber materials will appear embrittlement and hardening,cracking,darkening of the color and other aging phenomena.There are a lot of rubber aging factors,thermal oxygen aging is the most common.Adding high-performance antioxidants is an important means to delay the aging process of rubber and improve the service life of rubber.In this paper,the most popular general synthetic rubber styrene-butadiene rubber(SBR)and a wide range of thermoplastic elastomer SBS as raw materials,the anti-thermal aging of the upstream emulsion polystyrene-butadiene latex and the downstream emulsion polystyrene-butadiene rubber mixture were studied,and the anti-thermal aging of SBS glue were also carried out.The effects of emulsification process conditions on the properties of anti-oxidant emulsions were investigated by orthogonal method.The suitable antioxidant emulsification process conditions were selected.After that,emulsion blending and flocculation experiments were carried out on the emulsion polystyrene-butadiene latex and the antioxidant emulsion.In the curing experiment,the thermo-oxidative aging mechanism of butadiene-styrene materials was investigated by specific testing methods,and the feasibility of using Arrhenius formula combined with condensed phase kinetics to predict the life of materials was deduced.The effects of different coupling agents on the mechanical properties,processing properties and anti-aging properties of silica-filled ESBR were investigated.The difference between the high performance antioxidant and the commercially available antioxidant 4020 on the mechanical properties and anti-aging properties of the handrail was compared.In the upstream raw rubber experiment,the orthogonal method not only optimizes the antioxidant emulsion with smaller average particle size,concentrated particle size distribution,and stable emulsion system,but also compares the difference in the degree of influence of properties of antioxidant emulsion from emulsion temperature,shear rate and emulsification time.The main antioxidant Anox-1315 will deepen the yellowing index(YI)of the ESBR gel,while the auxiliary antioxidant Naugard-705T can reduce the increase of YI well.The main and auxiliary antioxidants can synergistically resist oxygen.It is more effective in delaying the progress of the rubber thermal aging reaction.Experiments prove that using the Arrhenius formula combined with the condensed phase reaction kinetics derivation and thermodynamic test methods to predict the life of ESBR raw rubber and SBS products,in a specific temperature range,is simple and also has reference value.The protective synergistic effect of antioxidants was evaluated by defining two parameters,protective factor PF and synergistic factor SF.It was found that the ti,PF and SF of the samples were temperature dependent,and their values decreased with increasing temperature.When the working temperature is 80?,and the compounding ratio of the primary and auxiliary antioxidants is 1:2,the life of the rubber compound can be increased by 148 times or more,and the synergistic antioxidant efficiency can be increased by more than 5 times.In the SBS matrix,the synergistic effect between different antioxidants was compared,and the synergistic anti-oxidation of the main anti-Anox-PP18 and the auxiliary anti-Weston-705T can increase the life of the SBS matrix by 9.5 times at a working temperature of 80?.In the downstream mixing rubber experimental system,it was found that the coupling agents KH550,KH560 and Si69 will affect the vulcanization characteristics of the rubber compound.When the ratio of Si69 to white carbon black exceeds 8%,the total crosslinking density of the vulcanized rubber is basically unchanged.Under the condition that the coupling agent has a ratio of white carbon black of 8%,the comprehensive mechanical properties and anti-aging properties of the rubber compound are Si69>KH560>KH550.through the interaction parameters ?,I,we found the interaction force between the fillers is blank Sample>KH550>KH560>Si69,the interaction force between the filler and the substrate is Si69>KH550>KH560>blank.In the hand-held rubber of mixture and vulcanization.The primary antioxidant AS and the auxiliary antioxidant Weston-705T compound exhibit superior effect of thermal stability and anti-aging compared to the conventional primary antioxidant 4020 and the auxiliary antioxidant Weston-705T compound.