Research On The Preparation And Static Safety Properties Of Antistatic PA6

Polyamide 6(PA6) is a kind of engineering plastic which is widely used in production and life. But its surface resistivity is too high to discharge static, which may cause harm. In order to control the harm of static and achieve intrinsically safe, this paper prepared permant antistatic PA6 by copolymerization and blending methods. The mainly research works are summarized as follows: 1. Research on preparation and properties of permanent antistatic PA6 based copolymer(1)Polyethylene glycol(PEG) were used as antistatic modification to prepare PA6-PEG permanent antistatic copolymer. The effect of the fraction of PEG on the structure, water absorption, surface resistivity, thermal stability, mechanical properties of the copolymer were respectively researched, and the influence of polycondensation vacuum, condensation polymerization time, temperature on the properties of product were studied. The results showed that: esterification reaction occurred between PA6 prepolymer and PEG to form copolymer. PEG was added to effectively reduce the surface resistance of PA6 to 109Ω. The initial thermal decomposition temperature of PA6-PEG copolymer is above 388℃. PEG had toughening effect on PA6. The optimal condensation process conditions was: condensation temperature 255℃, polycondensation time 40 min, polycondensation vacuum-0.04 MPa.(2) Hydroxyl silicone oil, polyether silicone were respectively used as antistatic modification to prepared other two series of permanent antistatic PA6 based copolymer under the optimal condensation process conditions.The influence of fraction of hydroxyl silicone oil and polyether silicone on the properties of copolymer were researched and the results showed that: esterification reaction occurred between PA6 prepolymer and HSO to form copolymer, HSO was added to reduce the surface resistance of PA6 to 1010Ω, the initial thermal decomposition temperature of PA6-hydroxyl silicone oil copolymer is above 400℃. Esterification reaction occurred between PA6 prepolymer and polyether silicone to form copolymer, polyether silicone was added to reduce the surface resistance of PA6 to 109Ω, the initial thermal decomposition temperature of PA6- polyether silicone copolymer is above 380℃. Hydroxyl silicone oil and polyether silicone all had toughening effect on PA6。 Compared with the others, the comprehensive properties of PA6-PEG copolymer was most excellent.2.Research on preparation and properties of permanent antistatic PA6-PEG/ Lithium salt composite materialsBased on the principle of solid polymer electrolyte(SPE), three different lithium salts(C18H35Li O2, Li Cl, Li Ac) were used to prepare permanent antistatic PA6-PEG/ lithium salt composite material. Effect of the type and the amount of lithium salt on structure and properties of composite material were researched and the influence of different processing technology on the properties of composite materials were studied.The results showed that: Lithium ions were coordinated by the oxygen atom of ether bond of PEG chains and amido of PA6 chains. Compared with PA6-PEG coppolymer, composite materials had lower surface resistivity which less affected by humidity. The composite material had good thermal stability whose thermal decomposition temperature were above 350℃. Compared with PA6-PEG copolymer, the mechanical properties of the composite decreased but within acceptable range. Injection molding was more suitable for the processing of permanent antistatic PA6-PEG/lithium composites than compression molding.