Water-based gold powder dispersant: With these advantages,"C position debut"
Water-based gold powder dispersant: With these advantages, "C position debut"
As a key auxiliary agent in the water-based system, the core advantage of water-based gold powder dispersant is to significantly improve the stability, glossiness, weather resistance and environmental protection of water-based coatings by optimizing the dispersion performance of gold powder. The following is a detailed analysis of its advantages from the two aspects of technical principles and application effects:
1. Technical advantages: improving dispersion efficiency and stability
Super strong wettability
Principle: The polar groups (such as carboxylic acid groups and phosphate groups) in the dispersant molecules can be quickly adsorbed on the surface of gold powder, reducing surface tension and achieving "instant wetting".
Effect: Reduce dispersion time (such as 1 hour for traditional processes, only 30 minutes after using dispersants), and avoid gold powder agglomeration.
Stereoscopic steric hindrance effect
Principle: The polymer dispersant forms an adsorption layer as thick as 10-20 nm on the surface of the gold powder, preventing the particles from approaching each other through steric hindrance.
Effect: Even at high concentrations (such as 50% solid content), the gold powder can still remain stably suspended and avoid sedimentation.
Electrostatic stabilization mechanism
Principle: The dispersant gives the gold powder a negative charge on the surface, forming a double-layer structure, and maintains dispersion through electrostatic repulsion.
Effect: In a neutral environment of pH 7-9, the Zeta potential of the gold powder can reach more than -40 mV, significantly improving the dispersion stability.
2. Application advantages: Improve the comprehensive performance of coatings
High gloss and metallic texture
Effect: The dispersed gold powder has a uniform particle size (D50≤5 μm), and the reflected light angle is consistent, forming a mirror effect, and the glossiness is increased by 20%-30%.
Case: In automotive metallic paint, a mirror gloss of ≥90 GU (60° angle) can be achieved by combining with a water-based gold powder dispersant.
Weather resistance and corrosion resistance
Effect: The dispersant can form a protective film to isolate the gold powder from contact with water and oxygen, and delay oxidative discoloration.
Data: After QUV accelerated aging test (1000 hours), the gold powder discoloration ΔE≤1.5, which is much lower than the ΔE≥3.5 without adding dispersant.
Environmental protection and construction performance
Environmental protection: VOC emissions of water-based systems ≤50 g/L, in compliance with EU REACH regulations and China's national standard GB 38507-2020.
Construction performance: Dispersants can reduce system viscosity by 20%-30%, improve leveling, and reduce shrinkage and pinhole defects.
3. Cost and efficiency advantages
Reduce raw material costs
Effect: By increasing the solid content of gold powder (can be increased to 60%-70%) and reducing the amount of solvent, the cost of coating per unit area is reduced by 15%-20%.
Improve production efficiency
Effect: Dispersion time is shortened, no grinding is required (direct high-speed dispersion is sufficient), and the efficiency of the production line is increased by more than 30%.
4. Comparison between water-based gold powder dispersant and traditional solvent-based dispersant
| Comparison Items | Water-based gold powder dispersant | Traditional solvent-based dispersants |
| Environmental protection | VOC≤50 g/L, non-toxic and odorless | VOC≥300 g/L, including benzene |
| Stability | Storage stability ≥ 6 months (room temperature) | Easy to separate, need frequent stirring |
| Glossiness | ≥90 GU (60° angle) | 70-80 GU |
| Construction | Good leveling, no shrinkage holes | Prone to sagging and orange peel |
| Cost | The cost per unit area is reduced by 15%-20% | Anti-settling agent needs to be added, which increases the cost |
5. Application scenario recommendation
High-end coatings: automotive metal paint, furniture mirror paint, industrial anti-corrosion paint
Printing inks: hot stamping ink, mirror silver ink
Decorative materials: imitation metal wallpaper, metallic texture paint
Electronics: conductive silver paste, electromagnetic shielding paint
Summary
Water-based gold powder dispersant not only solves the dispersion problem of gold powder in water-based system through the triple mechanism of "wetting-dispersion-stabilization", but also achieves breakthroughs in environmental protection, glossiness, weather resistance, etc. It is an inevitable choice to replace traditional solvent-based dispersants.