Influence of carbon black trimodal mixture on LDPE films properties: Part3 – Fillers

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Abstract Previous studies in this journal reported a two-part investigation on carbon black (CB) dispersions in LDPE films. In PART01, trimodal CB mixtures were evaluated using a Design of Experiments (DOE) to assess colorimetric and rheological properties, containing small (S) and medium (M) particles showed higher Tinting Strength (TS) with lower viscosity due to synergistic interactions. In PART02, dispersion of blend F18 was optimized during twin-screw extrusion by evaluating the Specific Mechanical Energy (SME), and the best performance was obtained at 600 rpm and 10 kg/h (0.29 kWh/kg), defined as F18-P03. In PART03, this formulation was filled with micro- (D50: 2.5 μm) or nano-CaCO3 (D50: 40 nm) at 10 and 20 wt% to reduce cost and modify mechanical properties. Although CaCO3 reduced TS, increased Filter Pressure Value (FPV) and viscosity. Nanoparticle at 10 wt% showed the best balance: Young’s modulus increased 18%, while tensile strength and deformation decreased about 8%.

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