Polyurethane Dispersion manufacturer

What is Waterborne Polyurethane Dispersion with Excellent Water and Oxygen Barrier Performance for AlOx PET Coating? A Waterborne Polyurethane Dispersion designed for excellent water and oxygen barrier performance on AlOx-coated PET film is a colloidal suspension of polyurethane polymer particles in water, specifically engineered to provide a dense, continuous protective layer over aluminum oxide (Al₂O₃) vacuum-coated PET substrates. Unlike conventional solvent-borne barrier coatings, this advanced Waterborne Polyurethane Dispersion contains no organic solvents, making it an environmentally responsible choice for high-barrier flexible packaging applications. The dispersion typically features a solids content of 32±1.5%, a pH value in the range of 7.0–9.0, and a Brookfield viscosity below 500 mPa·s at 25°C, ensuring excellent processability on high-speed roll-to-roll coating lines.The key differentiating feature of this Waterborne Polyurethane Dispersion is its ability to form a highly impermeable film against both water vapor and oxygen molecules. When applied onto AlOx-coated PET – where the AlOx layer already provides a certain level of barrier – the polyurethane topcoat fills microscopic defects (pinholes, cracks, and grain boundaries) inherent in the vacuum-deposited inorganic layer. Furthermore, the formulation allows the optional addition of a crosslinker (such as water-dispersible polyisocyanate or aziridine-based crosslinkers) before application. Upon thermal curing, the crosslinker reacts with the polyurethane chains to form a three-dimensional thermoset network, drastically reducing free volume and enhancing the tortuosity of the diffusion path for permeants. This synergistic effect between the inorganic AlOx barrier and the crosslinked organic topcoat results in outstanding water vapor transmission rate (WVTR) and oxygen transmission rate (OTR) values, often meeting the most demanding requirements for moisture-sensitive dry foods, pharmaceuticals, and electronic components.     Key Advantages and Characteristics of This Waterborne Polyurethane Dispersion The adoption of a Waterborne Polyurethane Dispersion with excellent water and oxygen barrier performance for AlOx PET coating brings multiple technical, environmental, and economic benefits. Below is a detailed examination of its key advantages.   1. Superior Water and Oxygen Barrier Performance through Crosslinkable Chemistry The most critical advantage of this Waterborne Polyurethane Dispersion is its ability to achieve extremely low WVTR and OTR values when properly formulated and applied. In its uncrosslinked state, the polyurethane film already offers moderate barrier properties due to the inherent hydrophobicity of the polyurethane backbone and the formation of a continuous, defect-free film upon drying. However, the true potential is unlocked when an external crosslinker is incorporated into the dispersion prior to coating. Upon thermal curing (typically at 40–80°C for a few minutes to 48 hours, depending on line speed and post-curing conditions), the crosslinker creates covalent bonds between polyurethane chains, converting the linear or lightly branched polymer into a dense, three-dimensional network. This crosslinked structure significantly reduces the mobility of polymer segments and eliminates microscopic free volumes through which water and oxygen molecules can diffuse. As a result, the permeation path becomes highly tortuous, leading to a dramatic decrease in transmission rates. For example, a properly crosslinked Waterborne Polyurethane Dispersion topcoat can reduce the WVTR of a 12 µm AlOx PET film from several units to below 0.5 g/m²/day (at 38°C, 90% RH) and the OTR to below 0.1 cm³/m²/day (at 23°C, 0% RH), making it suitable for high-barrier applications such as vacuum insulation panels and retortable pouches. Moreover, the Waterborne Polyurethane Dispersion effectively seals pinholes and micro-cracks that are inevitably present in the vacuum-deposited AlOx layer. Even state-of-the-art metallization processes cannot achieve a completely defect-free inorganic coating. The polyurethane topcoat acts as a planarization layer, filling these defects and providing a continuous barrier across the entire film surface. This synergy is the fundamental reason why a combination of AlOx and a high-performance Waterborne Polyurethane Dispersion outperforms either layer alone.   2. Exceptional Adhesion to AlOx-Coated PET Substrates Adhesion is a perennial challenge in coating inorganic oxide layers with organic polymers. The surface of AlOx-coated PET has a relatively high surface energy but also contains polar groups (Al–OH) that can interact favorably with the urethane linkages (–NH–CO–O–) in the polyurethane backbone. This Waterborne Polyurethane Dispersion is specifically designed to maximize hydrogen bonding and acid-base interactions with the AlOx surface, resulting in strong, durable adhesion that resists delamination during subsequent converting steps (slitting, lamination, bag making) and end-use conditions. The low viscosity (<500 mPa·s) of the Waterborne Polyurethane Dispersion ensures excellent wetting of the AlOx surface, which is critical for achieving intimate contact at the molecular level. Poor wetting leads to air entrapment and weak boundary layers, both of which compromise adhesion and barrier performance. Formulators can further enhance adhesion by incorporating silane coupling agents or specialized adhesion promoters into the dispersion, though the base resin itself already provides robust anchorage on properly treated AlOx PET.   3. Solvent-Free, APEO-Free, and Low-VOC Formulation for Regulatory Compliance and Safety In response to increasingly stringent global regulations on volatile organic compounds (VOCs) and hazardous air pollutants (HAPs), this Waterborne Polyurethane Dispersion is manufactured without the use of organic co-solvents. Traditional solvent-borne barrier coatings rely on large amounts of ketones, esters, or aromatic hydrocarbons, which pose significant health risks to workers, contribute to photochemical smog formation, and require expensive solvent recovery or incineration systems. In contrast, the Waterborne Polyurethane Dispersion uses water as the sole continuous phase, reducing VOC emissions to near-zero levels. Furthermore, the dispersion is formulated without alkylphenol ethoxylates (APEOs), which are known to degrade into persistent, endocrine-disrupting compounds in the environment. Many jurisdictions, including the European Union, have restricted or banned the use of APEOs in products intended for food contact. By adopting an APEO-free Waterborne Polyurethane Dispersion, converters and brand owners can confidently meet the requirements of ecolabels (such as EU Ecolabel, Blue Angel) and retailer sustainability standards. The water-based nature of this Waterborne Polyurethane Dispersion also improves workplace safety by eliminating fire and explosion hazards associated with solvent handling. Cleanup and equipment washing can be performed with water, reducing hazardous waste generation and simplifying regulatory compliance.   4. Flexibility and Toughness: Maintaining Barrier Integrity during Mechanical Deformation One of the inherent weaknesses of purely inorganic barrier layers (e.g., AlOx or SiOx) is their brittleness. When the PET film is flexed, creased, or stretched during printing, lamination, or end-use (e.g., a flexible pouch being squeezed), the inorganic layer can crack, leading to catastrophic loss of barrier performance. The Waterborne Polyurethane Dispersion topcoat acts as a protective buffer that absorbs mechanical stress and distributes it across the elastic polyurethane network, thereby preventing crack propagation from reaching the AlOx layer.   Even when the Waterborne Polyurethane Dispersion is crosslinked, it retains a certain degree of flexibility due to the segmented structure of polyurethane – alternating soft segments (polyether or polyester diols) and hard segments (diisocyanate and chain extender). This microphase-separated morphology provides an optimal balance between toughness and flexibility. Consequently, the coated film can withstand repeated flexing, folding, and creasing without significant loss of barrier properties. This is particularly important for flexible packaging formats such as stand-up pouches, spouted pouches, and vacuum bags, where the package is subject to continuous mechanical abuse during filling, transport, and consumer handling.   5. Excellent Chemical Resistance and Durability against Oils, Greases, and Solvents Packaging films often come into contact with aggressive substances: cooking oils, acidic or alkaline foods, alcoholic beverages, and even organic solvents. The crosslinked Waterborne Polyurethane Dispersion topcoat exhibits excellent resistance to a wide range of chemicals. The crosslink density can be adjusted by varying the type and amount of crosslinker, allowing formulators to tailor the coating for specific end-use environments.   For applications such as retort pouches (sterilization at 121°C under pressure), the Waterborne Polyurethane Dispersion must withstand high-temperature steam and pressure without delamination or hydrolytic degradation. Properly formulated crosslinked polyurethane dispersions using hydrolysis-resistant polyester polyols or polyether polyols can meet retort requirements, provided that the crosslinker is chosen appropriately (e.g., blocked polyisocyanates that activate at retort temperatures). The result is a durable, chemically resistant barrier that maintains product protection even under harsh conditions.   6. Processability on High-Speed Roll-to-Roll Coating Lines Industrial viability depends on how well the coating material performs on existing converting equipment. The water based Polyurethane Dispersion described here has a viscosity below 500 mPa·s (Brookfield, 25°C), which makes it suitable for a variety of coating techniques including gravure, reverse roll, slot-die, and even rod coating. Its shear-thinning behavior (pseudoplasticity) ensures good leveling after application while preventing excessive sagging or edge bead formation. The dispersion’s stability under high shear – typical in gravure and reverse roll coating – is excellent, with no risk of coagulum formation that could lead to streaks or die lines. Furthermore, its relatively low foaming tendency allows for high-speed operation without the need for excessive defoamer addition, which might otherwise compromise barrier performance. The recommended coating weight for achieving optimal barrier ranges from 1 to 3 g/m² dry, which can be achieved with standard gravure cylinders or slot-die systems.   7. Sustainability: Supporting Recyclability and Circular Economy A growing concern in flexible packaging is the recyclability of multilayer structures. Traditional high-barrier films often use aluminum foil or metallized films laminated with solvent-borne adhesives, making them difficult to recycle due to the incompatibility of materials. The combination of AlOx PET and a Waterborne Polyurethane Dispersion topcoat offers a more recyclable alternative. Because the entire structure is based on PET (the AlOx layer is only a few nanometers thick, and the polyurethane topcoat is typically less than 2 µm), the monomaterial PET structure can be recycled in existing PET recycling streams, provided that the polyurethane coating is compatible and does not interfere with the recycling process.   Many Waterborne Polyurethane Dispersions are designed to be alkali-soluble or to disintegrate under standard PET recycling conditions (hot caustic wash), allowing the clean separation of PET flakes. This aligns with the principles of the circular economy and helps brand owners meet their sustainability pledges. Additionally, the water-based nature of the coating eliminates the need for organic solvents in the lamination process, further reducing the carbon footprint of the finished package.   8. Long-Term Storage Stability and Handling Convenience According to the technical data sheet of RHERI® HP1208 (a representative product of this class), the Waterborne Polyurethane Dispersion is stable for six months from the delivery date when stored at 20°C in originally closed containers. The recommended storage temperature range is 5–35°C. Within this range, the dispersion maintains consistent viscosity, particle size distribution, and film-forming properties. Freezing must be avoided, as ice crystal formation can irreversibly damage the particles, leading to coagulation. Similarly, storage above 35°C can accelerate particle agglomeration and sedimentation. To prevent microbial contamination, biocides are typically added during manufacturing. However, end-users should avoid introducing foreign microorganisms through unclean equipment or prolonged storage of open containers. If contamination occurs, the Waterborne Polyurethane Dispersion may develop odor, discoloration, or viscosity drift, and should not be used for high-barrier applications. With proper handling, this dispersion offers excellent batch-to-batch consistency and reliable performance.   Application Areas of Waterborne Polyurethane Dispersion with Excellent Water and Oxygen Barrier Performance for AlOx PET Coating The unique combination of properties exhibited by this Waterborne Polyurethane Dispersion makes it suitable for a wide range of demanding flexible packaging applications. Below are the primary sectors where this technology is already being deployed. 1. High-Barrier Food Packaging for Dry and Moisture-Sensitive Products Snack foods, nuts, dried fruits, coffee, tea, powdered milk, and nutritional supplements require packaging that effectively excludes oxygen and moisture to preserve flavor, texture, and nutritional value. AlOx PET coated with this Waterborne Polyurethane Dispersion (optionally crosslinked) provides an excellent solution. The transparent barrier film allows consumers to see the product while ensuring extended shelf life. Compared to metallized films, the transparent barrier film also enables metal detector compatibility – a critical requirement in food processing lines.   2. Pharmaceutical and Medical Device Blister Packaging Blister packs for tablets and capsules must meet extremely low OTR and WVTR specifications to prevent drug degradation. Regulatory standards such as USP <671> and European Pharmacopoeia require barrier performance validation. The Waterborne Polyurethane Dispersion topcoat on AlOx PET provides a reliable, non-aluminum alternative to traditional cold-form foil blisters. The transparency of AlOx PET also allows visual inspection of the tablets without opening the package, improving quality control.   3. Electronic Component and Moisture-Sensitive Device (MSD) Packaging Semiconductors, printed circuit boards, and other moisture-sensitive electronic components are packaged in high-barrier bags to prevent corrosion and solderability issues during storage and transportation. The combination of AlOx PET and a crosslinked Waterborne Polyurethane Dispersion can achieve WVTR values below 0.1 g/m²/day, meeting the requirements of MIL-PRF-131 and other military specifications. The anti-static versions of such dispersions are also available for ESD-sensitive applications.   4. Vacuum Insulation Panel (VIP) Encapsulation VIPs are used in refrigerators, freezers, and building insulation. They require an extremely high-barrier envelope to maintain internal vacuum over the product’s lifetime (typically 15–20 years). Multilayer structures incorporating AlOx PET and a crosslinked Waterborne Polyurethane Dispersion topcoat have demonstrated outstanding gas barrier retention even after accelerated aging tests. The flexibility of the polyurethane layer also helps the envelope withstand the mechanical stresses of vacuum sealing.   5. Retortable Stand-Up Pouches for Ready-to-Eat Meals Retort packaging (sterilization at 121°C) demands exceptional resistance to heat, pressure, and moisture. While AlOx alone cannot withstand retort conditions due to hydrolysis of the oxide layer, a properly crosslinked Waterborne Polyurethane Dispersion topcoat can protect the AlOx layer and provide additional barrier. When combined with high-temperature resistant adhesives and polypropylene sealant layers, the resulting laminate can be used for retortable pouches for pet food, soups, and ready-to-eat meals.   6. Industrial and Agricultural Chemical Packaging Agrochemicals, fertilizers, and industrial detergents are often aggressive and require robust barrier packaging to prevent leakage and contamination. The chemical resistance of crosslinked Waterborne Polyurethane Dispersion makes it suitable for lining or coating the inner surface of such packages. The solvent-free formulation ensures that no residual solvents migrate into the chemical product.   7. Aseptic Packaging for Liquid Foods (Juice, Milk, Liquid Eggs) Aseptic cartons (e.g., those used for shelf-stable milk) traditionally rely on aluminum foil as the barrier layer. AlOx PET coated with a high-barrier Waterborne Polyurethane Dispersion offers a lightweight, crease-resistant alternative that can be used in aseptic packaging lines. The absence of pinholes (a common issue with thin aluminum foil) improves reliability, and the transparent nature of the barrier allows for package inspection.   8. Overprint Varnish and Protective Topcoat for Printed AlOx PET Films In some applications, the AlOx PET film is printed with graphics before the barrier coating is applied. A clear version of the Waterborne Polyurethane Dispersion can be used as an overprint varnish (OPV) that simultaneously provides water and oxygen barrier while protecting the printed ink from abrasion and chemicals. This simplifies the converting process by combining decoration and barrier functionality into a single coating step.   Conclusion Waterborne Polyurethane Dispersion with excellent water and oxygen barrier performance for AlOx PET coating represents a paradigm shift in the design of high-performance, sustainable flexible packaging. Far from being a mere drop-in replacement for solvent-borne barrier coatings, this advanced dispersion enables converters and brand owners to meet the dual challenge of stringent preservation requirements and environmental responsibility.   Through its ability to form a crosslinkable, defect-filling topcoat, this Waterborne Polyurethane Dispersion synergizes with AlOx layers to achieve ultra-low WVTR and OTR values that were previously attainable only with aluminum foil or multiple layers of expensive barrier materials. Its solvent-free, APEO-free, low-VOC composition ensures full compliance with global food contact regulations and ecolabel standards, while its excellent adhesion and flexibility guarantee reliable performance even under mechanical stress and aggressive environments. The Waterborne Polyurethane Dispersion described in this article – exemplified by products like RHERI® HP1208 – is already making an impact in food, pharmaceutical, electronics, and industrial packaging. As the industry continues to move towards monomaterial, recyclable structures and circular economy models, the role of such Waterborne Polyurethane Dispersions will only become more central. Advances in crosslinker technology, bio-based polyols, and self-healing polymers promise to further enhance the barrier performance and sustainability profile of these versatile materials.   For converters and packaging engineers seeking to upgrade their product lines, adopting a high-performance Waterborne Polyurethane Dispersion with excellent water and oxygen barrier for AlOx PET coating is not just a technical improvement – it is a strategic investment in the future of responsible packaging.

Core Potential Industry Layouts The water based polyurethane dispersion industry has gained extensive attention and in-depth layout in multiple high-potential fields. In the plastic and film processing industry, as a key primer material, it effectively solves the bonding problem between coatings and substrates, which is widely used in the production of packaging films, plastic products for electronic appliances, and automotive interior plastics. With the increasing demand for high-performance and environmentally friendly materials in these industries, the market demand for this product is showing a steady growth trend. Additionally, it is gradually expanding into emerging fields such as water-based coatings, adhesives, and textile finishing. In the water-based coatings industry, it meets the requirements of environmental protection policies due to its solvent-free characteristics, and its excellent adhesion and weather resistance make it an ideal choice for architectural coatings and industrial coatings. In the textile industry, it can improve the wear resistance and softness of fabrics, opening up new application spaces. Key Technological and Application Progress Technological innovation is the core driving force for the development of the industry. In terms of product performance optimization, enterprises have continuously improved the formula and production process, making the product's adhesion on various substrates more stable, and further reducing the viscosity while ensuring solid content, which enhances the convenience of construction. The solid content of the product is maintained at 33±1%, the pH value is controlled between 7.0-9.0, and the viscosity is less than 400 mPa·s, which are the results of precise technological control. In terms of application technology, the matching processes between the product and subsequent coatings have been continuously improved, realizing more efficient and high-quality production lines. Moreover, the research on storage technology has also made progress. By optimizing packaging materials and storage environment control schemes, the product's shelf life is guaranteed to be 6 months under appropriate conditions (20℃, intact original packaging), and the adaptability to storage temperature (5℃-30℃) has been further enhanced, reducing the risk of performance degradation caused by improper storage. Summary and Future Outlook In summary, the water based polyurethane dispersion industry is currently in a stage of rapid development with broad market prospects. Its unique environmental protection properties and excellent performance have enabled it to occupy an important position in traditional fields such as plastic and film processing, and continuously penetrate into emerging industries. The continuous advancement of key technologies and the expansion of application scenarios have laid a solid foundation for the sustainable development of the industry. Looking to the future, with the deepening of global environmental protection concepts and the continuous upgrading of industrial demand, the industry will face more development opportunities. It is expected that in the next few years, the product will be further optimized in terms of performance, and the application fields will be more diversified. At the same time, driven by technological innovation and market demand, the industry will attract more investment and research forces, promoting the entire industry to move towards a higher quality and more sustainable development direction.

In the ever-evolving digital age, traditional culture and art are integrating with modern technology in an unprecedented manner, shining brightly.​ Among them, DTF Heat Transfer Film, as a brilliant new star under this integration trend, not only inherits the essence of traditional craftsmanship but also achieves a dual leap in personalized customization and efficient production with the help of modern digital printing technology. It has become a new favorite in various fields such as decorative art, fashion design, and home soft furnishings.​ The Artistic Charm of DTF Heat Transfer Film​ DTF Heat Transfer Film is a new and efficient printing process. It refers to a printing technology where the desired pattern is first printed on a special PET heat transfer film using a white ink heat transfer machine, followed by powder application and drying, and finally the pattern is transferred from the transfer film to the surface of the substrate (such as fabric, leather, etc.) using a heat press.​ Whether it is an exquisite landscape painting or a vivid cartoon image, white ink heat transfer can present them with extremely high restoration and precision, dazzling people.​ Technology Empowers Infinite Innovation​ Traditional hand-painting or printing methods are often limited by factors such as cost, efficiency, and precision. In contrast, white ink heat transfer technology cleverly integrates modern digital printing technology, realizing a seamless connection from design to production.​ Designers only need to complete the pattern design on the computer, and through professional direct to film printing equipment, the design can be accurately transferred to various materials such as fabric, leather, and PVC. This greatly shortens the production cycle, reduces costs, and ensures the stability and consistency of product quality. ​ Personalized Customization Leading the Trend​ In this era of pursuing individuality, white ink heat transfer meets consumers' demand for uniqueness and customization with its unique technological advantages.​ Whether it is a personalized T-shirt, a fashionable bag, or an artistic home accessory, a one-of-a-kind design can be achieved through white ink heat transfer technology. This personalized customization service model not only enriches the market supply but also stimulates consumers' purchasing desire, promoting the vigorous development of related industries. ​Environmental Protection and Energy Conservation for a Green Future​ It is worth mentioning that while pursuing efficiency and beauty, white ink textile heat transfer technology also takes into account the concepts of environmental protection and energy conservation.​ Compared with traditional printing methods, white ink heat transfer technology reduces the use of chemical solvents and lowers environmental pollution. At the same time, its efficient production process also reduces energy consumption, which is in line with the requirements of sustainable development and provides strong support for the green transformation of the industry.​ In summary, as a model of the combination of traditional craftsmanship and modern technology, DTF Heat Transfer Film is leading new trends in various industries with its unique artistic charm, efficient production capacity, and personalized customization services.​ To learn more about white ink heat transfer, welcome to follow us!

Introduction​ Waterborne polyurethane dispersion(PUD) have emerged as pivotal materials in modern industrial production, favored for their environmental friendliness and versatile performance. Among them, the waterborne PUD discussed herein stands out with its exceptional film-forming elasticity, reliable adhesion, and broad applicability, making it a preferred choice across multiple fields.​ Core Performance Advantages​ This waterborne PUD is characterized by outstanding flexibility and elastic performance, which endow the formed film with excellent resilience—enabling it to recover quickly after being subjected to external forces without permanent deformation. Meanwhile, it exhibits strong adhesion on a variety of substrates, ensuring stable bonding and long-term performance retention in different application scenarios. The product appears as a bluish liquid, with a solid content of 40±1%, a pH value ranging from 7.0 to 9.0 (measured at 25°C), and a viscosity of less than 800 mPa·s (tested by Brookfield at 25°C), presenting favorable processing properties for subsequent production operations.​ Versatile Application Fields​ Thanks to its comprehensive performance, this waterborne PUD has found wide application in multiple key fields. In the paper plastic-substitute sector, it serves as an ideal material for manufacturing environmentally friendly paper-based products that replace traditional plastics, contributing to reduced plastic pollution. Additionally, it performs excellently in the leather industry, where it enhances the softness and durability of leather products. It is also suitable for the textile field, providing functional modifications to textiles to improve their comfort and performance. Its versatility allows it to meet the diverse requirements of different industrial sectors. ​ Storage and Handling Guidelines​ To maintain the product's stable performance, proper storage and handling are essential. When stored in intact original packaging, the product remains stable for 6 months at 20°C after delivery. The recommended storage temperature range is 5°C to 30°C. Freezing or exposure to temperatures exceeding 30°C may adversely affect the product's viscosity and average particle size, potentially leading to sedimentation or coagulation. Moreover, contamination by bacteria, fungi, or algae can cause irreversible damage to the product, so strict hygiene control during storage and use is necessary.​ Conclusion​ This waterborne polyurethane dispersion excels with its excellent film formation elasticity, reliable adhesion, and favorable physical and chemical properties. Its wide applicability across paper plastic-substitute, leather, textile, and other fields highlights its strong practical value in industrial production. By adhering to the recommended storage and handling requirements, users can ensure the product maintains its optimal performance, making it a trustworthy and efficient material choice for enterprises pursuing high-quality and environmentally friendly production solutions.