Effects of POE on Mechanical Properties and Adhesion with Interior Paint of Modified Polypropylene
POE was used to modify polypropylene(PP)to improve paint adhesion on the surface of PP material for automotive interior.By means of differential scanning calorimetry,scanning electron microscope,Dyne pen,Paints Cross-cut test and mechanical property test,the effects of POE on crystallization property,dispersion ability,surface tension,paint adhesion and mechanical properties of modified PP were investigated.The results show that with the increase of POE,the tensile yield strength and bending modulus of modified PP decrease,and the notch impact strength increases.The higher melt flow rate(MFR)of POE,the greater the reduction of rigidity.The higher the content of POE,the more favorable it is to improve the surface adhesion of modified PP.When the POE content is not less than 15%,the Paints Cross-cut test level of the template reaches 0.The higher the MFR of POE,the more conducive to the orientation and dispersion of the rubber phase on the surface of the template,which is conducive to the immersion of the paint and the improvement of the paint adhesion.When the paint film thickness is less than 26 μm,it is difficult to form an effective and dense paint film on the surface of the template,resulting in poor paint adhesion of the template.When the paint film thickness is not less than 26 μm,the template paint adhesion is better.
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