Mar 03, 2022

Polyurethane Systems using Ketonic Resins

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Polyurethane is one of the most versatile materials available today. From shoes and insulation to medical supplies, polyurethane (PU) systems are used in all types of applications. So it should be no surprise that modern manufacturers are always looking for ways to develop stronger, better and longer-lasting PU systems.

This blog takes a look at the basics of polyurethanes and the benefits of using ketonic resins in a PU formulation.

What is a PU system?

A polyurethane (PU or PUR) system typically consists of a polyol (polyester or polyether type), an isocyanate and an additive. The properties of the system ultimately depend on the stoichiometric proportions of the isocyanate and polyols.

The oldest type of PU system is a one-component PU system. These systems are based on di- or tri-isocyanates that are cured by reacting with active hydrogen on a substrate or moisture.

The most widely used polyurethane (PU system) is the bi-component system consisting of a Polyol and an Iso-Cyanide. Adding ketonic resins improves the overall quality and stability of the bi-component system and provides long-lasting strength and durability.

Benefits of Ketonic Resins

Ketonic resins, also known as ketone resins, contain hydroxyl groups and can be combined with polyols to create a polyurethane system. Here’s how it works—the ketonic resin mixes with the polyol and reacts with the isocyanate. The strong bond created by the hydroxyl group and isocyanates guarantees a strong resistance to water, heat and corrosion.

The ketonic resins can be made into a solution (e.g., mixed in chloroform) before reacting with the isocyanates. The solvent will then need to be removed by vacuum. The ketonic resin is also compatible with a wide range of polyols and can be blended directly into the polyols and then reacted with the isocynate.

Ketone resins share the same reactive site/group as a polyol, providing a number of benefits for manufacturers in multiple fields:

• Blends easily with polyols
• Strong reaction with isocyanates
• Enhances the overall properties of the PU system
• Serves as an additive, offering numerous benefits like gloss, leveling, adhesion to substrate

POLYTONE® K Series Ketonic Resins

The POLYTONE® K Series from Polyols & Polymers includes ketonic resins that contain high levels of hydroxyl groups as per the requirement of the formulator. This makes them ideal for combined use with polyols and isocyanates in the development of bi-component polyurethane systems (PU or PUR 2K).

The K Series resins react easily with mono and di-isocyanates, such as HDI, TDI, MDI and IPDI. This technology is used in a wide variety of applications, including indoor and outdoor floors and roofs. They are particularly well-suited for environments such as industrial plants, warehouses, garages, car parks, etc.

H.M. Royal offers a variety of resins from Polyols & Polymers to meet your specific application needs. For more information or to request a quote, contact an H.M. Royal expert today.