نانفينج معدلة كبريتات الباريوم عجلت فائقة الدقة 2500 شبكة للدهانات

 

Product Overview‌

Nanfeng Modified Precipitated Barium Sulfate Ultrafine 2500 Mesh is a cutting-edge, surface-functionalized barium sulfate engineered for premium paint systems demanding extreme fineness, chemical resistance, and optical precision. With a ‌D50 particle size of 0.8–1.2 µm‌ (ISO 13320) and ‌99.5% purity‌, this nano-enhanced filler sets new benchmarks for TiO₂ replacement efficiency (up to ‌35%‌), surface smoothness (Ra ≤0.05 µm), and weathering durability in automotive, industrial, and marine coatings.

Synthesized via patented Hydrothermal Nano-Precipitation technology and modified with organosilane coupling agents, this product delivers:

• ‌Colloidal Stability:‌ Zero sedimentation in solvent-borne systems after 90 days (ISO 1524).
• ‌Reinforcement Properties:‌ 20% improvement in pencil hardness (up to 4H, ASTM D3363).
• ‌Halogen-Free Chemistry:‌ REACH/RoHS/ELV compliant (Pb/Cd/As ≤1 ppm).
• ‌Thermal Endurance:‌ Stable up to 1,580°C, compatible with high-bake (160–200°C) curing processes.

Certified under ISO 9001, ISO 14064, and EcoVadis Gold standards, Nanfeng 2500 Mesh is the sustainable choice for formulators targeting VOC reduction, extended service life, and carbon-neutral production.

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‌Key Features & Competitive Advantages‌

1. ‌Optical & Surface Perfection‌

   • ‌Gloss Modulation:‌ Achieves 5–80 GU @ 60° with 5–20% loading (vs. 10–30% for conventional BaSO₄).
   • ‌Hiding Power Boost:‌ 1.02 contrast ratio (ASTM D2805) at 25% TiO₂ replacement.
   • ‌Orange Peel Elimination:‌ DOI (Distinctness of Image) ≥90 in automotive clear coats.

2. ‌Mechanical & Chemical Resilience‌

   • ‌Abrasion Resistance:‌ 35% lower wear volume vs. unmodified BaSO₄ (Taber test, CS-17 wheel, 1kg/5,000 cycles).
   • ‌Salt Spray Resistance:‌ 2,500+ hours without blistering (ASTM B117).
   • ‌Acid Rain Durability:‌ ≤0.2% mass loss after 50 cycles of pH 3.5 H₂SO₄ spray (SAE J2334).

3. ‌Formulation Intelligence‌

   • ‌Ultra-Low Oil Absorption (6–9 g/100g):‌ Reduces resin demand by 18–25%, slashing VOC emissions.
   • ‌Thixotropy Control:‌ Maintains Stormer viscosity at 85–95 KU (ASTM D562) with 0.5–1.5% rheology modifiers.
   • ‌Anti-Sag Performance:‌ ≥150 µm wet film thickness without sagging (ASTM D4400).

4. ‌Sustainability & Compliance‌

   • ‌Carbon-Neutral Manufacturing:‌ 100% renewable energy-powered production.
   • ‌Closed-Loop Water System:‌ 98% process water recycled.
   • ‌FDA Compliance:‌ Meets 21 CFR 175.300 for indirect food contact coatings.

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‌Technical Specifications‌

‌Parameter‌	‌Specification‌	‌Test Method‌
‌Chemical Composition‌
BaSO₄ Purity	≥99.5%	XRF (GB/T 2899-2008)
Moisture Content	≤0.05%	Karl Fischer (ISO 760)
‌Physical Properties‌
Particle Size (D50)	0.8–1.2 µm (2500 mesh)	Laser Diffraction (ISO 13320)
Specific Surface Area	8–12 m²/g	BET (ISO 9277)
Specific Gravity	4.3–4.4 g/cm³	Pycnometer (ISO 787-10)
‌Surface Modification‌
Silane Content	0.8–1.5% w/w	TGA (ISO 11358)
Hydrophobicity	Contact angle ≥120°	ASTM D7334
‌Performance Data‌
pH (10% Slurry)	6.5–7.5	Potentiometric (ISO 787-9)
Conductivity	≤50 µS/cm	DIN 53779
LOI (1,000°C)	≤0.1%	TGA (ISO 11358)

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‌Application-Specific Benefits‌

‌1. Automotive Coatings‌

• ‌Basecoat Systems:‌ Enhances metallic flake orientation (15% improvement in flip-flop effect).
• ‌Electrocoat Primers:‌ Improives throw power by 20% (GM 9505P test).
• ‌Self-Healing Clearcoats:‌ Reduces scratch visibility (85% recovery rate after 70°C/2h annealing).

‌2. Industrial & Marine Coatings‌

• ‌Chemical Tank Linings:‌ Withstands 30% HCl/NaOH exposure for 6 months (ISO 2812-1).
• ‌Offshore Corrosion Protection:‌ Passes NORSOK M-501 cyclic testing (-30°C to 150°C, 50 cycles).
• ‌Powder Coatings:‌ Achieves 98% transfer efficiency in tribo-charging systems.

‌3. Architectural Paints‌

• ‌Exterior Wall Finishes:‌ ΔE ≤0.8 after 5,000 hrs QUV-A (ASTM G154).
• ‌Anti-Graffiti Coatings:‌ ≥100 cleanings with ≤5% gloss loss (EN ISO 11998).
• ‌Low-VOC Interior Paints:‌ Meets EU Decopaint Directive (VOC ≤30 g/L).

‌4. Specialty Coatings‌

• ‌Aerospace Topcoats:‌ Reduces ice adhesion by 40% (SAE AMS 1424).
• ‌3D-Printed Coatings:‌ Enables 10 µm layer resolution via enhanced rheology.
• ‌EMI Shielding Paints:‌ Achieves 60 dB attenuation at 1 GHz (ASTM D4935).

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‌Production Process & Quality Control‌

1. ‌Raw Material Selection:‌
   • High-purity barite ore (BaSO₄ ≥99%) and organic silanes (APTES/OTES).
2. ‌Hydrothermal Synthesis:‌
   • BaCl₂ + H₂SO₄ → BaSO₄↓ at 120°C/3 bar (pH 4.0–4.5, 2-hour dwell).
3. ‌In-Situ Modification:‌
   • Simultaneous silane grafting during crystallization for monolayer coverage.
4. ‌Nano-Milling:‌
   • Wet grinding with 0.1mm YSZ beads to D97 ≤2 µm.
5. ‌Spray Drying:‌
   • Low-temperature (80°C) drying to preserve surface functionality.
6. ‌Quality Assurance:‌
   • SEM/TEM for particle morphology and dispersion analysis.
   • XPS to verify silane coupling efficiency (≥85%).
   • ICP-MS for ultra-trace heavy metals (Pb/Cd/As ≤1 ppm).

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‌Competitive Comparison: Nanfeng 2500 Mesh vs. Alternatives‌

‌Property‌	‌Nanfeng Modified BaSO₄‌	‌Nano CaCO₃‌	‌Fumed Silica‌
‌Particle Size (D50)‌	0.8–1.2 µm	0.4–0.8 µm	5–50 nm
‌Oil Absorption‌	6–9 g/100g	20–28 g/100g	200–300 g/100g
‌TiO₂ Replacement Rate‌	25–35%	8–12%	5–10%
‌Cost Efficiency‌	$3,200–3,500/ton	$1,000–1,500/ton	$8,000–12,000/ton
‌Environmental Impact‌	Zero wastewater, carbon-neutral	Moderate CO₂ footprint	High energy intensity

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‌Why Choose Nanfeng 2500 Mesh?‌

1. ‌Nano-Technology Leadership:‌ 40+ patents in surface modification and dispersion.
2. ‌Global Compliance:‌ REACH, TSCA, KC Mark, and GHS-aligned SDS.
3. ‌Custom Solutions:‌ Adjustable silane types (amino, epoxy, vinyl), D50 from 0.5–3 µm.
4. ‌Supply Chain Agility:‌ 10,000-ton annual capacity, 21-day global delivery.

 

Product Appearance	white powder
BaSO4 content	98.0% min
105 °C volatile matter	0.14 max
Water soluble matter	0.28 max
Fe	0.0016 max
Whiteness	97.5 min
Oil absorption	22.7
pH value	7.7
Fineness	0.01 max
Sulfide content	/
D50	/
Conductivity	/

 

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