POLYURETHANE DISPERSIONS
Polyurethane dispersions (PUDs) are aqueous solutions of polyurethane polymers that are used in a variety of applications. PUDs are typically made by reacting a polyol with a diisocyanate, followed by the addition of a chain extender and a crosslinking agent. The resulting polymer is then dispersed in water using surfactants and other agents to stabilize the dispersion. The resulting PUD has a low viscosity and can be easily applied by spraying, dipping, or roll coating.
To apply PUDs as a coating, it is first necessary to prepare the surface by cleaning and degreasing it, and possibly also roughening it to increase the bond strength. The PUD is then applied using the desired method, and may be left to air dry or cured using heat or UV light. When applying PUDs as an adhesive, it is important to ensure that the surfaces being bonded are clean and dry, and to apply an even layer of the adhesive. The bonded surfaces should then be held in place until the adhesive has had sufficient time to cure.
It is important to follow the manufacturer's instructions when using PUDs, as different formulations may have different application requirements. It is also advisable to wear protective clothing, such as gloves and goggles, and to work in a well-ventilated area when handling PUDs.
They find use in coating, adhesives, sealants and Elastomers. Specific uses include industrial coatings, UV coating resins, floor coatings, hygiene coatings, wood coatings, adhesives, concrete coatings, automotive coatings, clear coatings and anticorrosive applications. They are also used in the design and manufacture of medical devices such as the polyurethane dressing, a liquid bandage based on polyurethane dispersion. To improve their functionality in flame retardant applications, products are being developed which have this feature built into the polymer molecule. They have also found use in general textile applications including coating nonwovens.
It is important to follow the manufacturer's instructions and use the proper application methods to ensure the best performance and durability of the PUD coating
Polyurethane dispersions (PUDs) offer a number of benefits when compared to other types of polyurethane coatings.
Water-based: PUDs are water-based, which makes them easier to apply and clean up compared to solvent-based polyurethane coatings. PUDs also emit fewer volatile organic compounds (VOCs), making them more environmentally friendly.
Durability: PUDs are known for their excellent durability and abrasion resistance. They can withstand high levels of wear and tear and are often used in industrial and commercial applications where durability is a key concern.
Flexibility: PUDs are highly flexible, which makes them ideal for use on surfaces that may be subject to movement or expansion and contraction.
UV resistance: PUDs are resistant to fading and discoloration when exposed to UV light, making them suitable for use in outdoor applications.
Easy to maintain: PUD coatings are easy to clean and maintain, making them a practical choice for a wide range of applications.
Versatility: PUDs can be used in a wide range of applications, including coatings, adhesives, and sealants. They can be applied to a variety of surfaces, including wood, metal, concrete, and plastic.
Overall, PUDs offer a combination of durability, flexibility, UV resistance, and ease of use that makes them a popular choice for a wide range of applications.
C&E offers a wide variety of water-based, eco-friendly PUD technologies under our 'Puthane' range. We strive to create excellence by offering top-quality solutions to meet customer requirements. Contact us to understand our water-borne polyurethanes and how our products can be utilised for specific applications.
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By Shema on January 3rd, 2023