Preparation And Characterization Of Polypropylene Of Anti-tackiness And Scratch-resistance For Auto

Polypropylene(PP) plays a vital role in the development of lightweight vehicles due to its low density and excellent physical and chemical properties. However, the crystallization of polypropylene will lead to the poor low‐temperature impact behavior of the material, and the product tends to warp once the mold release. Thus PP must be modified before it is applied in the automotive interior trim parts. In this paper, PP as fundamental resin was toughed by POE as primary toughness agent, and3000mesh talcum(talc) as filler, PP/POE/talcum blends reach good balance between toughness and rigidity. Erucylamide，oleamide，amide，and organic silicon were used to improve the scratch‐resistance of PP blends.The results showed that the scratch‐resistance of PP blends was effectively increased by adding erucylamide and oleamide, while it was not obviously improved by adding EBS. The introduction of amide did not cause deterioration of tensile yield strength, flexure module, izod impact strength,and MFI of PP blends. When the content of erucylamide was0.9wt%, the△L of PP blends was decreased from5.2to1.3, the tensile yield strength was reduced by12.4%, the flexure module was increased by11.3%, izod impact strength and MFI were increased by25.2%and7.2%. When the content of oleamide was0.9wt%, the△L of PP blends was decreased from5.2to1.1, the tensile yield strength was reduced by5.1%, the flexure module was increased by4.1%, izod impact strength and MFI were increased by4.4%and13.8%. When the content of EBS was0.9wt%, the△L of PP blends was decreased from5.2to4.2, the tensile yield strength was unchanging, the izod impact strength was reduced by3.5%, the flexure module and MFI were increased by1.1%and6.6%. The scratch‐resistance and anti‐volatile of PP with erucylamide and oleamide were weak. The scratch‐resistance turn worse after exposed by xenon‐arc weatherometer for480hrs. The FT‐IR microscope spectra showed that the substance resulting in tackness was lubricant, and the mechanism of dislocation was discussed.The scratch‐resistance of PP blends was effectively increased by adding organic silicon. The organic silicon did not cause deterioration of tensile yield strength, flexure module, izod impact strength,and MFI of PP blends. When the content of organic silicon was4.5wt%, the△L of PP blends was decreased from5.2to1.2, the tensile yield strength was reduced by0.8%, the izod impact strength was reduced by2.2%, flexure module and MFI were increased by7.3%and11%. The scratch‐resistance of PP turn better after exposed by xenon‐arc weatherometer for480hrs, and no any tackiness phenomena was found on the surface of PP. The Volatile Organic Compound(TVOCs) of PP with4.5wt%organic silicon were similar to the PP without organic silicon.