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Influence of the photosensitive resin system on the rheological and photocuring characteristics of zirconia slurries for DLP fabrication
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DOI：10.1007/s10853-026-13570-6.png)
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Abstract
En 中文
Digital light processing (DLP) 3D printing of zirconia requires precise control over both the rheological properties and photopolymerization behavior of a slurry. To tailor these properties, this study systematically formulated a series of novel photosensitive resins using polyfunctional monomers and hyperbranched oligomers. The primary objective is to elucidate the directional bonding mechanisms and synergistic stabilization effects of resin functional groups at the multiphase "resin-dispersant-powder" interface. The results demonstrate that multiple acrylate carbonyl groups in TMPTA form a stable interfacial assembly through hydrogen bonding with the dispersant (KOS110) and the surface hydroxyls of zirconia particles. Moreover, the amide groups in ACMO further reinforce the stability and structural integrity of this hydrogen-bonded network. This combined molecular interactions ultimately endows the slurry with superior flowability and enhanced dispersion stability. Under the optimized formulation, the high-solid-loading slurry achieved a zero-shear viscosity of 5845 mPa·s and an infinite-shear viscosity of 552 mPa·s. Its sedimentation ratio decreased to 16.5%, representing a significant reduction of 24.3% compared to the control group. Additionally, introducing the hyperbranched oligomer RY7007 generated a effective steric stabilization that effectively suppressed particle agglomeration, leading to a 23% reduction in the overcuring width (down to 2.5–4.6 mm).After sintering, the final ZrO2 components demonstrated a controlled linear shrinkage of 20.5% and a relative density of 98.8%. Overall, these results provide valuable guidelines for the rational design of resins in high-solid-loading photocurable suspensions, thereby improving the dimensional precision of ceramic additive manufacturing.
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3.9
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3.2W
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7.2W
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