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Copolymer of Phosphono and Carboxylic Acid (PCA) CAS 71050-62-9
A highly effective scale inhibitor and corrosion inhibitor for water treatment applications.
Chemical Structure and Properties
POCA is produced by introducing a phosphonic group into a carboxylic acid copolymer backbone. This unique structure combines the properties of both carboxylic copolymers and organic phosphonates, enabling it to perform multiple functions simultaneously.
Property
Description
Appearance
Colorless to light yellow transparent liquid
Solid Content
≥ 30.0% (standard grade); 50% grade also available
POCA prevents scale formation and corrosion through three primary mechanisms:
Chelation / Complexation - The carboxylic groups chelate calcium and magnesium ions in the water, reducing the concentration of scale-forming ions.
Crystal Lattice Distortion - The phosphonic groups adsorb onto the surface of growing micro-crystals, disrupting their normal growth pattern and preventing them from forming hard, adherent deposits.
Dispersion / Electrostatic Repulsion - The polymer disperses suspended particles, preventing them from aggregating and depositing on metal surfaces.
Quantum chemistry studies have shown that POCA's corrosion inhibition performance primarily comes from the phosphonic group, which readily donates electrons to the empty d-orbitals of iron atoms on the metal surface, forming a protective adsorption layer.
Performance Advantages
Advantage
Description
Broad-Spectrum Scale Control
Effective against calcium carbonate, calcium phosphate, barium sulfate, strontium sulfate, and silica/silicate scales
Wide Water Quality Tolerance
Performs well in high-pH, high-hardness, high-alkalinity, and high-concentration-ratio conditions
Chemical Stability
Excellent thermal stability and strong resistance to chlorine oxidation
Synergistic Effects
Works well in combination with other organic phosphonates, copolymers, zinc salts, and benzotriazole (BTA)
Environmentally Friendly Options
Low-phosphorus formulations (<3% phosphorus content) align with green chemistry principles
Applications
Industrial Circulating Cooling Water Systems
POCA is widely used in cooling towers and recirculating cooling systems to prevent scale formation and corrosion on heat exchange surfaces. Typical dosage is 5-20 mg/L. Studies have shown that at concentrations as low as 5 mg/L, POCA achieves over 90% inhibition of calcium carbonate and calcium phosphate scales.
Oilfield Water Injection Systems
In oilfield operations, POCA is used to prevent scaling in injection wells and pipelines, as well as to reduce corrosion rates on downhole equipment and surface facilities.
Formulated Products
POCA is often used as a component in blended formulations with:
Organic phosphonates (ATMP, HEDP, PBTCA)
Other copolymers
Zinc salts
Benzotriazole (BTA)
These blends provide enhanced performance for demanding water conditions, such as high-hardness and high-alkalinity cooling water.
Product Grades and Specifications
Parameter
Grade I (Standard)
Grade II (High-Performance)
Solid Content
≥ 30.0%
37.5-42.5%
Total Phosphorus (as PO₄³⁻)
≥ 7.0%
≥ 0.8%
Density (20°C)
≥ 1.10 g/cm³
≥ 1.20 g/cm³
pH (1% solution)
2.0-3.0
3.5-4.5 (stock solution)
Grade II is equivalent to Belsperse 164 from BWA Water Additives.
Usage and Handling
Dosage
Standalone: 5-20 mg/L
In blends: Dosage adjusted based on formulation and water quality
Packaging
Available in 25 kg, 200 kg plastic drums, or 1000 L IBC containers
Storage
Store in a cool, ventilated indoor area; shelf life is typically 10-12 months
Safety
POCA is acidic. Avoid contact with skin and eyes. In case of contact, rinse thoroughly with plenty of water.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2010
Total Annual:
3000W-0.2B
Employee Number:
100~500
Ecer Certification：
Verified Supplier
Hunan Hoyoshee Chemical Industrial Co.Ltd was established in 2019, it is a high-tech enterprise that integrates scientific research, development, design, production, sales, and technical consulting services. The company's annual production of 15000 tons of new materials and water treatment agen... Hunan Hoyoshee Chemical Industrial Co.Ltd was established in 2019, it is a high-tech enterprise that integrates scientific research, development, design, production, sales, and technical consulting services. The company's annual production of 15000 tons of new materials and water treatment agen...
