Material Analysis
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Poor Interfacial Bonding Between PU and Filler
Problem Phenomenon
PU-filler composite tensile strength is instead lower than pure PU, playing a negative role
Cause Analysis
Interfacial affinity between filler and PU poor, no coupling agent treatment used; filler particles agglomerated, dispersed particle size >5μm; PU wetting of rigid filler insufficient
Solution
1) Pretreat filler with silane coupling agent KH-560 0.5-1wt%; 2) Add PU compatibilizer 2-3wt% to strengthen interfacial adhesion; 3) Use ultrafine filler d50<2μm; 4) Twin-screw high-shear blending to ensure dispersion
Key Takeaway
The elastomer-filler interface requires the dual action of coupling agent and compatibilizer, otherwise the filler plays a negative effect
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