Sericite Powder for Anticorrosive Coating - Superior Weather Resistance for Industrial Applications
Product Overview
Sericite Powder is a micronized, high-aspect-ratio mica derivative specifically engineered to enhance the barrier properties and weather resistance of industrial anticorrosive coatings. With a unique lamellar structure and chemically inert composition, this additive forms an impermeable shield against moisture, UV radiation, and chemical attack, extending the service life of steel, concrete, and composite substrates in offshore, petrochemical, and infrastructure applications. Compliant with ISO 12944 C5-M corrosion standards, sericite-modified coatings demonstrate >25% improvement in salt spray resistance (ASTM B117) and 40% reduction in UV degradation vs. conventional fillers, enabling maintenance intervals of 15+ years in aggressive environments.
Technical Specifications
| Parameter | Specification | Test Method |
|---|---|---|
| Chemical Composition | KAl₂(AlSi₃O₁₀)(OH)₂ (≥98% purity) | XRF/EDS analysis |
| Particle Size | D50: 8–12 μm; D90: <25 μm | Laser diffraction (ISO 13320) |
| Aspect Ratio | 30:1–50:1 (diameter:thickness) | SEM image analysis |
| Brightness (ISO) | 85–88% (457nm reflectance) | ISO 2470-1 |
| Moisture Content | ≤0.5% | ASTM D280 |
| pH Value | 6.5–7.5 (1% aqueous suspension) | ISO 787-9 |
| Thermal Stability | Stable up to 600°C (no phase change) | TGA (ASTM E1131) |
| Oil Absorption | 45–55 g/100g (ASTM D281) | ISO 787-5 |
Core Innovations
1. Lamellar Barrier Technology
- Oxygen/moisture blocking:
- Parallel platelet alignment increases diffusion path length by 15x (ISO 7783-2).
- 0.02% water vapor transmission rate (WVTR) at 50μm film thickness.
- UV reflection:
- 80% UV-A/B reflectance (280–400nm) via layered silicate structure.
2. Surface Functionalization
- Silane coupling agents:
- Amino-silane (APTES) treatment improves epoxy/polyurethane adhesion by 30%.
- Hydrophobic octyl-silane modification for water contact angle >110°.
Performance Advantages
1. Corrosion Protection
| Test | Performance | Standard |
|---|---|---|
| Salt Spray Resistance | 3,500h (Blistering ≤Ri 1, Rust ≤0.5%) | ASTM B117 / ISO 9227 |
| Cathodic Disbondment | <5mm radius after 28d (65°C, -1.5V) | ASTM G8 |
| Chemical Immersion | 30d in 10% H₂SO₄/NaOH – coating intact | ISO 2812-2 |
2. Weathering Durability
- QUV Accelerated Aging:
- ΔE<2.0, Gloss retention >80% after 2,000h (ASTM G154).
- Thermal Cycling:
- Withstands -40°C to 120°C (20 cycles, no cracking – ISO 6270-2).
Industrial Applications
I. Offshore & Marine Coatings
- Oil Rigs/Platforms
- Submerged zone protection (ISO 20340 cyclic testing).
- Compatible with zinc-rich primers (≥85% Zn dust).
- Ship Hulls
- Reduces fouling adhesion by 40% (ISO 10890).
- Lowers hydrodynamic drag via ultra-smooth finish (Ra <5μm).
II. Petrochemical Infrastructure
- Storage Tanks
- Resists sour gas (H₂S) permeation (NACE TM0177).
- Fire-resistant up to 400°C (ASTM E119).
- Pipelines
- 3LPE coating reinforcement for trenchless installation.
- Cathodic protection compatibility (ONGC specification).
III. Civil Engineering
- Bridges
- Meets NTPEP 14-04 Class 25 corrosion requirements.
- Self-cleaning surface reduces pollution adhesion.
- Wind Turbines
- IEC 61400-6 certified for offshore wind farms.
- Erosion resistance >25m/s sand particle impact.
Formulation Guidelines
1. Optimal Loading Levels
| Coating Type | Sericite Content | Function |
|---|---|---|
| Epoxy Primers | 15–25 wt% | Conductivity control, barrier |
| Polyurethane Topcoats | 8–12 wt% | UV stabilization, gloss retention |
| Silicone Alkyds | 20–30 wt% | Heat resistance, flow control |
2. Dispersion Protocol
- Pre-mixing: Blend sericite with resin/solvent (1:1 ratio) for 10min @1,000rpm.
- Grinding: Pass through 3-roll mill (gap setting 10μm) to achieve Hegman 7+ fineness.
- Post-additives: Introduce after pigment dispersion to avoid structure breakdown.
Packaging & Storage
1. Packaging Options
- Standard: 20 kg multi-wall paper bags with PE liner.
- Bulk: 1,000 kg FIBC super sacks (anti-static option available).
2. Storage Requirements
- Humidity: <60% RH to prevent moisture absorption.
- Temperature: 10–35°C (avoid direct sunlight).
- Shelf Life: 24 months in original sealed packaging.
Quality Assurance
- Certifications:
- ISO 9001:2015 (QMS), ISO 14001:2015 (EMS).
- DNV GL RP-C301 compliant for offshore use.
- Batch Traceability:
- Laser-printed QR codes with XRD mineralogy reports.
Economic & Environmental Benefits
- Lifecycle Cost Reduction:
- Extends recoating intervals from 5 to 15+ years in C5 environments.
- Sustainability:
- 100% natural mineral; REACH/EPA exemption for heavy metals.
- Lowers VOC content by enabling high-solids formulations (≥80%).
Competitive Advantages
- Multi-Scale Protection: Combines lamellar barrier + UV reflection + chemical inertness.
- Universal Compatibility: Works with epoxy, PU, silicone, and fluoropolymer resins.
- Process Efficiency: Reduces sagging/viscosity spikes vs. glass flake additives.
- Global Compliance: Meets NORSOK M-501, SSPC-Paint 39, and AS/NZS 3750.15.
Technical Support Services
- Coating Design: Custom formulations for extreme pH/thermal conditions.
- Failure Analysis: SEM/EDX diagnostics for coating delamination issues.
- Field Testing: On-site adhesion/hesion pull-off tests (ASTM D4541/D7234).
Conclusion
Sericite Powder revolutionizes industrial anticorrosive coatings by transforming traditional barrier systems into intelligent, multi-functional shields. Its unique combination of lamellar particle alignment, UV reflectivity, and chemical stability addresses the trilemma of corrosion protection: longevity, aesthetics, and cost efficiency. By replacing up to 30% of TiO₂ or zinc dust without sacrificing performance, it enables formulators to meet tightening environmental regulations while slashing raw material costs. From Arctic pipelines to tropical offshore rigs, sericite-enhanced coatings deliver unmatched weather resistance, ensuring infrastructure integrity in the planet’s most punishing environments.
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| Company Name | Beijing TDD E-commerce Co., Ltd | Country/Region | China |
| Business Type | Online Store | Company Size | 2000 |
| Established | December 18, 2014 | ||
| Address | Building No.3, Area 6, No.188, West of South Forth Ring Rd, Beijing, China | ||
| Main Products | PVC Resin , PP , PE , Pet , Titanium Dioxide , Pigment , Car Tire | ||
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About Beijing United Information Technology Co., Ltd.
Beijing United Information Technology Co., Ltd. (Stock Code: 603613. SH), founded in 2002 and listed on the Main Board in July 2019, is mainly engaged in industrial e-commerce and industrial Internet platforms. Based on industrial e-commerce and supported by industrial big data and industrial digitalization, the company provides online commodity trading, business information services and digital technology services of industrial products and raw materials for related industries. In terms of business model, it is called "the industrial version of Pinduoduo" and "the industrial version of JD.com".
About Beijing TDD E-commerce Co., Ltd.
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Beijing TDD E-commerce Co., Ltd. (shortly named TDD Global) is the core subsidiary of Guolian Corporation (Stock Code: 603613.SH) and the first industrial Internetplatform of Duoduo Series Platforms. The company mainly engages in B28 e-commerce transaction serices of raw material and industrial products, digital supply chain serices, industrial digitalization serices and industrial big data serices, and is committed to promoting the deep integration of traditional industries and new technologies such as the Internet, Internet of Things, big data, intelligent manufacturing and block chain, etc.
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