Study On The Properties Of High-styrene Styrene-butadiene Rubber Reinforced By Aramid Pulp

Short fiber reinforced rubber composite material organically combines the rigidity of fibers and the elasticity of rubber,giving the rubber more excellent properties while retaining the advantages of rubber.In this paper,aramid pulp short fibers are used as reinforcing fibers to study the performance of aramid pulp(AP)reinforced carbon black(CB)/high-styrene styrene-butadiene rubber composites.Treating aramid pulp by ultraviolet irradiation,Li Cl solution complexing,latex coating,etc.,improving the adhesion between the fiber and the rubber matrix,combining the rubber processing analyzer(RPA),mechanical properties,scanning electronics Microscope(SEM),dynamic cutting resistance test,dynamic fatigue test and other characterization methods to analyze the performance of composite materials.The research content is as follows:(1)The addition of a small amount of aramid pulp can significantly improve the mechanical properties of high-styrene styrene-butadiene rubber composites.With the increase in the amount of fiber,the fixed tensile stress of the composite gradually increases,the elongation at break shows a decreasing trend,and the tear strength is obtained.It must be improved.When 6 g of aramid pulp is added,the composite has the best comprehensive mechanical properties.The addition of aramid pulp improves the cutting resistance of the composite.As the amount of fiber increases,the amount of glue removed from the composite gradually decreases.In the compression fatigue heat generation test,the sample temperature showed an increasing trend with the increase of fiber dosage.The addition of aramid pulp increased the heat generation of the composite material.After 10,000 dynamic fatigue tests,the complex modulus of the composite material added with aramid pulp remained high.Comparing the performance of highstyrene styrene-butadiene rubber(styrene content 40%)and ordinary styrene-butadiene rubber(styrene content 23.5%),under the same fiber content,high-styrene styrenebutadiene rubber composites have a higher 100% and 300% constant tensile stress,stronger cutting resistance,but higher heat generation than ordinary styrene-butadiene rubber composites.(2)The aramid pulp is treated by ultraviolet irradiation,Li Cl solution complexation,latex coating,etc.The modified fiber and high-styrene styrene-butadiene rubber are used to prepare composite materials.After 2,4 and 6 minutes of UV irradiation,the fiber surface morphology changed and the surface was destroyed.After UV irradiation of aramid pulp,the storage modulus of the vulcanized rubber increases,the interfacial adhesion between the fiber and rubber is improved,and the fixed tensile stress of the composite material is increased.In the dynamic fatigue test,the complex modulus of the composite material increases after the fiber is treated with ultraviolet light.Using different concentrations of Li Cl solution to treat aramid pulp,the crystallinity of the treated aramid pulp decreased.After the fiber is treated with a 10% Li Cl solution,the tensile strength and constant tensile stress of the composite are improved,and the comprehensive mechanical properties are better.After processing aramid pulp with butadiene latex and natural latex,the storage modulus and loss modulus of the vulcanized rubber increase.The latex forms a flexible interface between the aramid pulp and the rubber matrix,improving the interfacial adhesion between the fiber and the rubber.The addition of latex improves the fixed tensile stress of the composite material,and the composite mechanical properties of the composite material modified with butadiene latex modified aramid pulp are better.Dynamic fatigue test results show that the addition of latex improves the complex modulus of the composite,and the composite modulus of the fiber coated with butadiene latex is the largest.(3)The aramid pulp fibers were first subjected to UV irradiation for 4 min and complexed with a 10% strength Li Cl solution,and then coated with butadiene latex.The addition of butadiene latex improves the storage modulus of the vulcanized rubber.After the aramid pulp is modified by ultraviolet irradiation and coated with butadiene latex,the storage modulus is further improved,and the interface adhesion between the fiber and the rubber is obtained.improve.Compared with the compound modification,only the aramid pulp coated with butylpyrene latex has improved the tensile strength of the composite material.The comprehensive mechanical properties of the composite material after the aramid pulp has been modified by ultraviolet irradiation and butylpyrene latex coating better.The dynamic fatigue test results show that the addition of butadiene latex can keep the composite material at a higher complex modulus.