Preparation And Properties Of SSF/ADS And GF/PA6Composite Materials

Currently, the fiber-reinforced conductive plastics are mostly prepared byreactive extrusion process. In this process, the fibers are subject to strong shear effectof the screw in the twin-screw extruder, which not only makes the fibers too short, butalso makes the production worn seriously. Recently, the fiber coating process has beenused to study the preparation and application of conductive plastics. The aspect ratioof the fibers can be maintained greatly using the process, the product is excellent inelectrical properties and mechanical properties. Therefore, the stainless steel fiber（SSF）/acrylonitrile-butadiene-styrene （ABS） conductive composites were prepared byfiber coating process in this paper.The SSF is uniformly dispersed in the ABS resin after surface treatment. Withthe increase of SSF content, the resistivity of the composites is reduced gradually. Thevolume resistivity is lower than10^-1Ω·cm and the surface resistivity is less than100Ω·sq^-1when the SSF content is20wt%. Adding a certain amount of thebromine-based flame retardant, the composites can be achieved UL94V0flameretardant level, and the conductivity and heat resistance of composites are improved.The different grades of ABS have different effects on the performance of thecomposites. PA757K composites have the highest mechanical properties and heatdeflection temperature. The flame retardant properties and electrical conductivity ofPA765composites are better than those of other composites. The volume resistivity ofPA746H composites is low, but its surface resistivity is large. The conductivity andthe flame retardant can be improved by the different mass ratio （PA757K:PA765）; theheat deflection temperature of the composites increase with the increases of PA757Kcontent.Due to excellent mechanical properties, heat resistance and wear resistance,polyamide （PA） composites are widely used in the automotive, construction,electronics, electrical, aerospace and sports, et al. However, PA composites arevulnerable to humidity, ultraviolet light and temperature in use and storage process,which causing aging phenomenon; this change reduces the safety and service life ofthe composites and limits their use in some special environment conditions. Therefore,the research on anti-aging of PA composites are value in application. Glass fiber （GF）/polyamide6（PA6） composites were prepared by reactive extrusion process inthis paper. Moreover, the hydrolysis, soil corrosion and ultraviolet aging resistance ofthe composites were analyzed.The higher the GF content, the lower the mechanical properties retention rate ofthe composites. The hydrolysis resistance can be improved by adding POE-g-MAHand chain extender SAG-008, and POE-g-MAH have better effect than the SAG-008.The mechanical properties retention rate is reduce with the increase of hydrolysis time.The resistance to soil corrosion of the composites filled the hydrolysis resistancechopped glass fiber （HR-GF） is better than that of the composites filled silanecoupling agent treated glass fiber （SC-GF）. With the increase of POE-g-MAH content,the appearance of the composites has little diffence in the before and after soilcorrosion, but the mechanical properties retention rate of the composites are adverselyaffected. Ultraviolet aging has greater effect of the appearance of the composites thansoil corrosion does.