Long-Term Stabilization of Graphene Slurries with Chemi Tech Dispersants

Graphene slurry stability directly impacts spray-coating film quality. Chemi Tech dispersants enable >50wt% high-solid slurries with >6-month storage stability through:

1. Solvent-Dispersant Synergy

Polar Solvent Adaptation: Dispersants with pyrrolidone groups (e.g., KMK-155) reduce interfacial tension to <20 mN/m in NMP/DMF systems;

Low-Boiling Alternatives: Ethanol-compatible dispersants (e.g., KMK-1520) achieve 30wt% solids without toxic solvents.

2. Rheology Control

Shear-Thinning Design: Long alkyl chains in dispersants decrease viscosity by >70% under spraying shear, improving atomization; static recovery prevents settling.

Thixotropy Optimization: At 0.5%-1.2% dosage, slurries exhibit thixotropic index >4.0, eliminating hard sedimentation.

3. Environmental Stability

Temperature Resistance: Siloxane-based dispersants suppress graphene wrinkling from -20°C to 80°C, maintaining conductive networks;

Anti-Aging Technology: Hindered phenol structures scavenge free radicals, preventing oxidative defects.

Validation: With 0.5g graphene in 5mL NMP + 1% KMK-155, slurry particle size varies <5% after 30 days, and sprayed film resistivity deviation ≤8%2.