The rheological regulation of fumed silica in 3D printing resins is mainly achieved through the following mechanisms:

1. Rheological Performance Regulation Mechanism
The abundant silanol groups (-OH) on the surface of fumed silica form a three-dimensional network structure through hydrogen bonding, endowing the system with unique thixotropic properties (shear thinning, static thickening). This property effectively prevents filler sedimentation and ensures uniform material distribution during printing.

2. Effect of Addition Amount on Rheological Properties
Optimal Addition Amount: At an addition amount of 3%, the tensile strength of the resin increases by 68% while maintaining good rheological properties. Excessive addition (>5%) leads to agglomeration and damages rheological properties.
Rheological Curve: High viscosity at low shear rates (facilitating interlayer bonding), and decreased viscosity at high shear rates (facilitating extrusion).

3. The Key Role of Dispersion Uniformity
Uniformly dispersed fumed silica can form a continuous network structure, significantly improving the thixotropic index of the resin. Aggregates can cause localized viscosity abnormalities, affecting printing accuracy.

4. Impact on 3D Printing Performance
Interlayer Bond Strength: Resins with good rheological regulation can reduce interlayer defects and improve mechanical properties.
Surface Roughness: Uniformly dispersed fillers can reduce surface roughness and improve finished product quality.

Do you need a specific list of optimized 3D printing resin formulations? We can help you compile a comparison table of rheological parameters and printing effects for different filler amounts.