Material Analysis
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Poor interfacial bonding between EVA and filler
Problem Phenomenon
Tensile strength of EVA and filler composite is instead lower than pure EVA, playing a negative role
Cause Analysis
Poor interfacial affinity between filler and EVA without coupling agent treatment; filler particles agglomerated with dispersion particle size >5μm; insufficient wetting of rigid filler by EVA
Solution
1) Filler pretreatment with silane coupling agent KH-560 at 0.5-1wt%; 2) Add EVA compatibilizer 2-3wt% to strengthen interfacial bonding; 3) Use ultrafine filler d50<2μm; 4) Twin-screw high shear blending to ensure dispersion
Key Takeaway
Elastomer-filler interface needs dual action of coupling agent and compatibilizer, otherwise filler has negative effect
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