| Polypropylene (PP) is one of the global production of the synthetic resins, with excellent mechanical and thermal stability properties, easy processing and many other advantages, it is widely used in fiber, appliances, light industry and other areas. With the development of the PP polymerization technology, the mechanical and smoothness properties of PP have been greatly improved, and in order that it is more widely used in home appliances, automotive, civil construction and other fields.However, PP is inflammable, oxygen index (LOI) of17to18, a large number of droplet combustion and it can easily spread the flame, But PP belongs to pure hydrocarbon polymer, which is a kind of high insulation materials, volume resistivity is commonly1016~1018. m, the surface resistivity of1016~1017, its application is a large degree of restriction.The traditional flame retarding of polypropylene(PP) needs a large amount of inorganic flame retardants, seriously influencing the mechanical properties of the materials. While most of the organic flame retardants are small molecular compounds containing halogen, nitrogen or phosphor, they have poor compatibility with PP and may precipitate or migrate in the matrix; Worthwhile, Antistatic agents are generally surfactant or conductive antistatic agents, making PP antistatic in a certain extent. Though the conductive carbon black can make an improvement on antistatic property, will impact on the mechanical properties, and they can’t obtain light color goods. The addition of carbon nanotubes has better effects than graphite, but the price is expensive. Surfactant antistatic agents are cheaper and working well, while they will lose efficacy in the dry atmosphere, and migration of small molecules would make surfactant loss, cutting down the agents’ lifespan. Since PP has drawbacks of poor flame retarding and high insulation, this subject proposed that chlorinated polypropylene(CPP) can be used as the flame retardant, compatibility, antistatic and toughening agents for its similar, amorphous and reaction structure with PP. Grafted with the right amount of organic amine and added a certain amount of antimony trioxide(AO) and antioxidant1010, cationic CPP master batches were generated. The master batch, chlorinated polyethylene (CPE) and polypropylene(PP) were melt-extruded by a twin-screw extruder, and got a multifunctional PP with flame retardant, toughened and antistatic properties. Its structure was characterized by IR and SEM; Mechanical properties were tested by universal sample machine and impact specimen machine; flame retarding was tested through limiting oxygen index(LOI), horizontal and vertical burning tests and analysis of burning morphology; the composites’ surface resistance was tested by a digital high resistance meter.The results indicate that: When the chlorinated polyolefin accounted for20wt%, CPP/CPE=1/9, the tensile strength of the composites was increased by40%than pure PP, While CPP/CPE=9/1, the impact strength got165%more than the pure PP and the oxygen index was boosted by41%, the horizontal burning reaches FH-1rating. surface resistivity gets to108. SEM results showed that: Both are added at the same time that increase the compatibility between the macromolecular, Through the results of surface resistivity we can see that as the change of external environment temperature and humidity of the air, the surface resistivity did not significantly increase or decrease trend, At last we got a type of permanent antistatic agent. |
