PRODUCTOS
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Resina de dispersión acuosa de poliuretano (PUD)
Polyurethane Dispersion With Excellent Water And Oxygen Barrier Performance For ALOX PET Coating
Waterborne Polyurethane Dispersion with excellent water and oxygen barrier performance has emerged as a critical technology for protective coatings on AlOx-coated PET films. This specialized Waterborne Polyurethane Dispersion is engineered to provide superior barrier properties against moisture and oxygen, ensuring the integrity and durability of the metallized film structure. With a solvent-free, APEO-free formulation and the option to use a crosslinker for further enhanced performance, this Waterborne Polyurethane Dispension meets stringent food safety and sustainability standards for flexible packaging applications.
Número de artículo :
Waterborne Polyurethane Dispersion HP1208Solicitud :
ALOX PET barrier CoatingCaracterística especial :
Excellent Water And Oxygen Barrier PerformanceProduct Overview
Waterborne Polyurethane Dispersion with Excellent Water and Oxygen Barrier Performance for AlOx PET Coating is a specialized, solvent-free water-based dispersion engineered to deliver outstanding barrier properties for Al₂O₃-coated PET films. This advanced Waterborne Polyurethane Dispersion is specifically formulated to provide a high-performance protective layer that effectively resists moisture and oxygen ingress, thereby preserving the integrity of the metallized structure. It forms a tough, crosslinkable film when combined with an optional crosslinker, enabling enhanced barrier performance for demanding flexible packaging applications. This Waterborne Polyurethane Dispersion integrates seamlessly into conventional coating processes, offering an efficient and sustainable solution to upgrade AlOx PET film performance without compromising its recyclability. It directly addresses the packaging industry’s critical need for high-barrier, food-safe materials, creating coated films that reliably protect sensitive contents while complying with global food-contact and environmental standards.
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Key Features
◊ Excellent Water and Oxygen Barrier Performance: This Waterborne Polyurethane Dispersion forms a dense, continuous film upon drying. When combined with an optional crosslinker, it creates a crosslinked polymer network that delivers exceptional resistance to both moisture and oxygen ingress, effectively protecting AlOx-coated PET films from degradation and preserving the integrity of the metallized layer.
◊ Food-Safe and Environmentally Responsible Formulation: As a solvent-free and APEO-free Waterborne Polyurethane Dispersion, it is designed to meet stringent global food-contact regulations for flexible packaging. The water-based system minimizes VOC emissions, eliminates hazardous substances, and supports the recyclability of PET film substrates, aligning with sustainability and circular economy goals.
◊ Superior Substrate Adhesion and Processability: Specifically engineered for AlOx-coated PET surfaces, this Waterborne Polyurethane Dispersion exhibits excellent wetting and adhesion properties, forming a tough protective layer without delamination or defects. Its low viscosity (<500 mPa·s) ensures stable runability and seamless integration into conventional coating lines, including gravure and roll-to-roll processes.
◊ Durability and Cost-Effective Protection: The robust film provided by this Waterborne Polyurethane Dispersion offers good resistance to physical abrasion and chemical exposure, safeguarding the coated film during storage, handling, and conversion. This delivers a reliable and economical high-barrier solution compared to multilayer laminates, enabling high performance without compromising production efficiency in high-speed flexible packaging operations.
|
Parameter |
Typical Value |
Unit |
Notes |
|
Appearance |
Milky white |
– |
Visual inspection |
|
Solid Content |
32±1.5 |
% |
Can be adjusted for formulation |
|
Viscosity (25°C, Brookfield RV) |
<500 |
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
The application of Waterborne Polyurethane Dispersion with Excellent Water and Oxygen Barrier Performance for AlOx PET Coating in the production of high-barrier flexible packaging involves a controlled and efficient process to maximize its protective properties on Al₂O₃-coated PET films.
◊ Substrate Preparation: The AlOx-coated PET film must be clean and free from contaminants such as dust, oil, or moisture. Optional corona or plasma treatment can be applied to enhance surface energy, ensuring optimal wetting and adhesion of the subsequent Waterborne Polyurethane Dispersion layer. This preparation step is critical for achieving a uniform defect-free coating that delivers consistent water and oxygen barrier performance.
◊ Coating Application Methods: This Waterborne Polyurethane Dispersion is engineered for compatibility with conventional roll-to-roll coating techniques, including gravure, reverse roll, and slot-die coating. Gravure coating is particularly effective for applying a precise, uniform wet film thickness of this Waterborne Polyurethane Dispersion, allowing accurate control over dry coat weight. For enhanced barrier performance, a crosslinker can be added in-line to the dispersion before application, promoting a thermoset network upon curing.
◊ Drying and Film Formation: After application, the coated web passes through a multi-zone drying oven with controlled temperature and airflow. Water is evaporated, causing the polyurethane particles to coalesce and form a dense, continuous film. If a crosslinker has been incorporated, the heat initiates a crosslinking reaction, transforming the Waterborne Polyurethane Dispersion into a three-dimensional polymer network. This irreversible structure is the key mechanism that provides exceptional resistance to both moisture and oxygen ingress, effectively protecting the underlying AlOx layer and PET substrate.
◊ Post-Treatment (Curing): To fully develop the ultimate water and oxygen barrier properties, a post-treatment curing stage is recommended. The coated film is kept at an elevated temperature (e.g., 40–60 °C for 24–48 hours) or passed through an additional heating tunnel to drive the crosslinking reaction to completion. This post-curing step enhances film density, cohesion, and durability, ensuring the barrier coating can withstand subsequent converting processes (slitting, lamination, bag making) and end-use conditions requiring high protection of sensitive contents.
Benefits

Achieve Excellent Water and Oxygen Barrier Performance for AlOx PET Films: This Waterborne Polyurethane Dispersion forms a dense, continuous film upon drying. When combined with an optional crosslinker, it develops a crosslinked polymer network that delivers exceptional resistance to both moisture and oxygen ingress, effectively protecting the Al₂O₃-coated PET layer from degradation and preserving the integrity of high-barrier flexible packaging.
Ensure Full Regulatory Compliance and Safety: As a purposefully formulated solvent-free and APEO-free Waterborne Polyurethane Dispersion, it eliminates concerns regarding the migration of hazardous substances, simplifying compliance with stringent global food-contact regulations (e.g., FDA, EU Framework Regulation (EC) No 1935/2004) and enhancing brand trust for food and pharmaceutical packaging applications.
Streamline Production with Excellent Processability: Designed for high-speed roll-to-roll coating lines (gravure, reverse roll, slot-die), this Waterborne Polyurethane Dispersion offers outstanding runability with low viscosity (<500 mPa·s) and good wetting properties. It provides strong adhesion to AlOx-coated PET substrates and exhibits excellent mechanical stability, ensuring efficient, defect-free production without line interruptions.
Uphold Sustainability Values without Compromising Performance: This eco-friendly Waterborne Polyurethane Dispersion is solvent-free, low-VOC, and non-toxic, facilitating the creation of recyclable PET-based packaging. It allows converters and brands to meet their environmental goals while delivering the high-barrier functionality required for demanding applications such as moisture-sensitive dry foods, pharmaceuticals, and electronic components.
Enhance Final Product Quality with a Robust and Durable Finish: The cured coating from this Waterborne Polyurethane Dispersion is not only highly resistant to water, oxygen, and chemical exposure but also offers good abrasion resistance and film integrity. This results in a premium-quality AlOx PET film that maintains its barrier performance throughout subsequent converting processes (slitting, lamination, bag making) and end-use conditions, ensuring long-term protection of sensitive contents.


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