邻苯二酚/聚乙烯亚胺共沉积修饰埃洛石制备耐老化天然橡胶OACSTPCD

Natural rubber products undergo aging during use,leading to a decline in physical,chemical,and mechanical properties,which results in the loss of their service value.The addition of antioxidants can effectively enhance the rubber's resistance to aging,but an excessive amount of antioxidants can easily lead to the"blooming"phenomenon.This study uses halloysite loaded with antioxidant RD to extend the service time of the antioxidant and modifies the halloysite with catechol/polyethylenimine to increase the binding force between the halloysite and natural rubber.The results show that when the ratio of antioxidant RD to halloysite is 3:1,the loading rate reaches 11.3％,which is the best loading effect.When the catechol/polyethylenimine modification time is 24 hours,the surface modification is the most uniform and the effect is the best.After aging at 90 ℃ for 7 days,compared to rubber directly added with the same amount of RD,the composite rubber with 40 parts of catechol/polyethylenimine-modified loaded antioxidant RD halloysite and 1.5 parts of free RD antioxidant exhibited the best retention of mechanical properties.Scanning electron microscopy results showed a significant improvement in the blooming phenomenon,indicating that the catechol/polyethylenimine-modified loaded RD halloysite can effectively enhance the aging resistance of natural rubber.