Research Of Antistatic Polypropylene

At present, products of polypropylene (PP) are extremely widespread at home and abroad. In some special fields, PP may replace some engineering plastics, and is widely applied to automobile industry, household electric appliances, industrial matching material, medical apparatus and daily area. But PP has excellent electrical insulation property, and the range of volume resistivity is 1016～1020?·㎝. Because of excellent electrical insulation property, the products of PP can accumulate the charge in the manufacture and use, and can cause some harms or accidents. Therefore, eliminating static electricity of PP and reducing the electronic resistivity is extremely essential. This article had researched and discussed mechanical properties and antistatic properties of PP which used two kind of different antistatic agents, and had discussed environment humidity's effects to antistatic PP. Main content is:(1) Antistatic system which contained short asbestos fiber and (PP/POE)-g-MAH-g-PAM had been achieved at last, and (PP/POE)-g-MAH-g-PAM which used as antistatic agent was prepared by extruded molding. The result indicated that, this antistatic agent belonged to macromolecule antistatic agent, main chain of this graft chain had acidamide groups, and it could cause electronic resistivity of PP to drop 2~3 magnitudes, the surface resistivity could reach to 1011?. Simultaneously, short asbestos fiber could build the strengthen "the network" in the system, also could help to electricity performance of PP and enhanced mechanical performance of PP. Environment humidity had the certain influence on electricity performance, but was not certainly obvious. Environment humidity increased from 40% to 80%, surface resistivity of PP dropped 2 magnitudes.(2) Antistatic system contained antistatic agent which was synthetic glycerol ethlene bistearic amide, short asbestos fiber and coupling agent. Mechanical performance of PP was optimal when the content of coupling agent was 1% of content of short asbestos fiber. Glycerol ethlene bistearic amide which was antistatic agent had polar acidamide groups and hydroxy groups, and had excellent hydrophilic properties. When content of glycerine ethylene double stearamide achieves 30PHR, surface resistivity of PP dropped to 1.67×1011?, but mechanics performance actually decreased. Because of addition of short asbestos fiber, electronic resistivity dropped 1 magnitude; simultaneously mechanics performance had an enhancement. The antistatic efficiency of the this antistatic system was better than the former, when environment humidity increased from 40% to 80%, surface resistivity of PP dropped 3～4 magnitudes.