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Aqueous Polyurethane Dispersion Resin (PUD)
Water-based Polyurethane Dispersion With Good Corrosion Resistance For Metal Protection Coatings
Water-based Polyurethane Dispersion with outstanding corrosion resistance has been developed as a high-performance binder system for metal protection coatings. This specialized aqueous polyurethane dispersion is formulated to deliver an optimal balance of hardness and flexibility, combined with excellent scratch resistance, water resistance, and chemical durability, thereby providing effective anti-corrosive protection for ferrous and non-ferrous metal substrates. In addition, its versatile adhesion profile ensures strong bonding to a wide range of materials, including metals and plastics. With a solvent-free, APEO-free composition and a controlled pH and viscosity for ease of processing, this water-based polyurethane dispersion can be further enhanced by optional crosslinkers to tailor film properties for demanding industrial applications. Its robust performance and environmentally friendly profile make it a reliable choice for sustainable, high-performance protective coating systems.
Item No :
Waterborne Polyurethane Dispersion RHERI U111Application :
Metal Protection CoatingsSpecial Feature :
Good Corrosion ResistanceProduct Overview
Waterborne Polyurethane Dispersion with Good Corrosion Resistance for Metal Protection Coatings is a specially formulated, solvent‑free aqueous dispersion designed to provide reliable anti‑corrosive performance for ferrous and non‑ferrous metal substrates. This advanced polyurethane dispersion combines exceptional hardness and flexibility with superior scratch, water, and chemical resistance, forming a dense, protective barrier that effectively inhibits corrosion under demanding environmental conditions. When optionally combined with a suitable crosslinker, this aqueous polyurethane binder develops a tough, crosslinked network that further enhances adhesion and film integrity, making it suitable for high‑performance industrial coatings. It integrates seamlessly into conventional spray, roll, or dip coating lines, offering an efficient and low‑VOC solution that improves metal part durability while maintaining substrate recyclability. This product directly addresses the coating industry’s growing demand for sustainable, high‑barrier protection systems, delivering coated metals that withstand aggressive media and meet stringent performance and regulatory standards for automotive, construction, and general industrial applications.
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Key Features
◊ Superior Anti-Corrosion Barrier Performance: This waterborne polyurethane polymer forms a dense, continuous film upon curing, effectively blocking the penetration of water, oxygen, and aggressive ions (e.g., chloride) that trigger metal corrosion. When combined with an optional crosslinker, it develops a three‑dimensional polymer network that significantly enhances the film’s barrier integrity, ensuring long‑term protection even under humid, saline, or mildly acidic environments commonly encountered in industrial and marine applications.
◊ Balanced Mechanical Strength and Toughness: Engineered with a carefully controlled hard/soft segment ratio, this aqueous urethane dispersion delivers an outstanding combination of hardness (pencil hardness up to H–2H) and elastic recovery, providing excellent resistance to scratching, marring, and impact damage. The tough yet flexible film accommodates substrate expansion and contraction without cracking, making it ideal for metal parts subject to thermal cycling or mechanical stress.
◊ Versatile Substrate Adhesion and Coating Adaptability: This water-based polyurethane exhibits exceptional wetting and adhesion to a wide range of metallic surfaces—including cold‑rolled steel, galvanized steel, aluminum, and copper alloys—as well as to engineering plastics. Its tailored rheology (Brookfield viscosity <600 mPa·s) ensures smooth application via spraying, roller coating, or dip coating, with excellent leveling and sag resistance. The dispersion also shows good compatibility with common pigments, fillers, and rheology modifiers, allowing flexible formulation adjustments for specific end‑use requirements.
◊ Sustainable, Low‑VOC Formulation: As a solvent‑free, APEO‑free, and amine‑free system, this polyurethane colloidal dispersion minimizes volatile organic compound emissions and eliminates hazardous air pollutants, supporting safe workplace environments and regulatory compliance (e.g., REACH, GB/T 38597). Its water‑based nature also facilitates easy cleanup and reduces waste disposal costs. Moreover, the coating can be formulated with bio‑based polyols, further enhancing its environmental footprint without compromising corrosion resistance—offering a responsible and economical solution for next‑generation metal protection coatings.
|
Parameter |
Typical Value |
Unit |
Notes |
|
Appearance |
semi-transparent, slightly yellowish |
– |
Visual inspection |
|
Solid Content |
34±1 |
% |
Can be adjusted for formulation |
|
Viscosity (25°C, Brookfield RV) |
<600 |
mPa·s |
Spindle 3, 20 rpm |
|
pH-value (25°C) pH |
7.0 - 9.0 |
/ |
/ |
|
Recommended Solvents |
Water |
– |
For formulation compatibility |
|
Shelf Life |
6 |
months |
Stored in sealed containers at 5°C ~35 °C |
|
Storage |
Cool, dry place |
– |
Avoid direct sunlight and moisture |
Applications
◊ Automotive underbody and chassis components – This polyurethane aqueous dispersion serves as a high-performance protective coating for steel and aluminum parts exposed to road salts, gravel impact, and moisture. Its unique combination of hardness and elastic recovery ensures excellent chip resistance and fatigue durability, while the dense film effectively blocks chloride ion penetration, preventing underfilm corrosion. The coating can be applied by spray or dip methods and, when combined with a water-dispersible isocyanate crosslinker, delivers enhanced crosslink density to withstand extreme temperature fluctuations and chemical exposure from de-icing agents and fuels.
◊ Steel structures for building and infrastructure – The aqueous polyurethane system provides a durable, anti-corrosive topcoat or direct-to-metal primer for structural beams, roofing sheets, and exterior cladding. With outstanding wet adhesion and barrier performance against oxygen and humidity, it protects against atmospheric corrosion in urban and industrial environments. Its solvent‑free, low‑VOC profile meets green building certifications, and its excellent recoatability allows easy maintenance. The coating also exhibits good UV stability when formulated with appropriate light stabilizers, extending service life in exposed applications.
◊ Marine and offshore equipment – For components such as deck hardware, piping, and crane parts operating in high‑salinity, high‑humidity conditions, this waterborne urethane binder offers superior salt spray resistance (tested up to 500 hours per ASTM B117 without red rust). Its tough yet flexible film withstands mechanical abrasion from mooring lines and cargo handling, while its chemical resistance protects against diesel, hydraulic fluids, and cleaning agents. The dispersion adapts to brush, roller, or airless spray application, enabling field repair and touch‑up in shipyards and offshore platforms.
◊ Industrial storage tanks and process pipelines – This polyurethane aqueous dispersion is ideal for lining internal surfaces of carbon steel tanks and pipes that contain water‑based chemicals, acids (pH > 3), or alkaline solutions. Its cured film provides a continuous, pinhole‑free barrier that resists permeation by aggressive media, preventing substrate pitting and stress corrosion cracking. The coating’s flexibility accommodates thermal expansion and contraction during filling and emptying cycles, and its good adhesion to phosphated and galvanized surfaces ensures long‑term integrity. Optional post‑cure at moderate temperatures further enhances chemical resistance for demanding service conditions.
◊ Fasteners, springs, and hardware – For small metal parts requiring high hardness (pencil hardness up to 2H) and superior scratch resistance, this waterborne polyurethane delivers a protective finish that can be applied by dip‑spin or electrostatic coating. Its low viscosity and excellent flow properties ensure uniform coverage even on complex geometries, while its anti‑corrosive performance replaces traditional zinc‑plating or chromate conversion coatings in many applications. The coating also provides a smooth, low‑friction surface that facilitates assembly operations and reduces galling during torqueing, offering a sustainable and safe alternative to solvent‑borne systems.
Benefits

◊ Superior anti‑corrosion barrier – This waterborne polyurethane system forms a dense film that effectively blocks moisture, oxygen, and aggressive ions. With optional crosslinker, it creates a three‑dimensional network, delivering salt‑spray resistance >500 h and greatly extending metal service life in automotive, marine, and industrial environments.
◊ Strong adhesion & film integrity – The aqueous polyurethane dispersion exhibits excellent wetting to steel, galvanized steel, aluminum, and conversion‑coated surfaces. Its balanced hard‑soft segments ensure flexibility and impact resistance, preventing cracking or delamination under thermal cycling and mechanical stress.
◊ Eco‑friendly & compliant – Solvent‑free, APEO‑free, and heavy‑metal‑free, this polyurethane aqueous binder minimizes VOC emissions and meets REACH, GB 30981, and green coating standards, supporting sustainable production without compromising performance.
◊ Processability & mechanical toughness – Low viscosity (<600 mPa·s) and shear stability enable easy spray, dip, or roll‑coat application. The cured film offers high hardness (up to 2H) combined with elastic recovery, providing excellent scratch, chip, and abrasion resistance for high‑throughput coating lines.


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