Polyurea Greases – Applications and Properties

Buying a lubricant is tricky and engineers work hard to find world-class lubricants that suits their equipment for high-performance.

Molygraph formulates specialty lubricants to meet high expectations of the Customers and supplies wide range of lubricant solutions for industrial, electrical, and mechanical maintenance.

Molygraph’s Polyurea grease technology provides ample opportunities to meet the lubrication requirements of tomorrow’s technologies. The invention and development of Polyurea grease is the most important innovation in grease technology in the last 70 years. The major advancement in this technology happened in Japan.

Today Polyurea grease represents more than 50% of the Japanese grease market. Looking at the inherent properties of Polyurea grease and the benefits that they offer, the grease technology has continued to advance and is now robust enough to be used in a variety of applications, replacing traditional grease chemistries.

Polyurea Grease is a premium first-class multipurpose, high temperature, extreme pressure grease. It is specially formulated to offer the extreme lubrication requirements of long service applications such as electric powered motor bearing.

Polyurea Thickeners were first introduced in 1954. Since then, many efforts were made to broaden a fibrous polyurea grease, ordinarily as a replacement for barium greases, which have health, protection and environmental issues related to the toxicity of barium compounds. Many styles of thickeners are used in any ordinary grease.

The most popular greases are primarily based on lithium, lithium complex, and calcium or aluminium complex cleaning soap thickeners. In recent years, polyurea thickened greases were gaining in significance, especially in metallic mill non-stop castors, automotive wheel bearings, regular speed joints, electric instrumentation and auxiliary system bearings.

In the first step, between 9-20 percent of weight of the selected isocyanates and amines and about forty percent of weight of base oils are loaded into an appropriate reaction kettle. The blend is then slowly blended at temperatures starting from 21 degree celsius to 204 degree celsius for lengthy sufficient motive formation of the thickener.They are synthesized in a three-step method involving a polymerization response of different isocyanates and amines in either mineral or synthetic base oils.

In the second step, suitable additives are mixed to the thickener. Portions of the final base oils are delivered to the thickener to achieve the desired viscosity grade and take it to temperatures appropriate for the addition of other overall performance additives. Those additives encompass antioxidants, extreme stress, antiwear agents and dyes.

Within the final step, the grease is homogenized to reap the desired NLGI grade. Homogenizers are desired over colloids considering the fact that they generate polyurea greases with better texture and can significantly modify the NLGI grade of the grease.

Polyurea greases offer excellent performance in industrial equipment. This is due to following capabilities:

• Outstanding rust and corrosion protection.
• Fantastic put on and intense stress safety.
• An excessive load-wearing capacity.
• Low noise.
• Long bearing life
• Outstanding thermal and oxidation stability.
• Excellent high temperature performance.
• Superb resistance to water washout and water spray-off.
• Accelerated sturdiness and shear stability

Molygraph’s PUG Series of products can be used in a diverse range of applications and provide superior long life stability, corrosion protection, and allow excellent pumpability when using centralized lubrication systems.

Molygraph’s PUG series of greases are an extremely robust, long lasting and versatile choice for long life applications

The output shaft of the constant velocity (CV) joints has the same rotational speed as that of the input shaft. It requires supreme quality greases to enhance the performance by protecting the inner additives from high stress. Polyurea greases offer superior outcomes and overall performance for CV Joints.

Polyurea greases are highly used in steel mill continuous castors (CC) The bearings of the rolling mills that carry the slab in CC have to support high weight and high temperature. High viscosity base oil greases are needed for such bearings to prevent rust and contamination. The lubrication in continuous castors is done by the centralized grease distribution system. This keeps the system lubricated at all times as fresh grease is pumped at frequent intervals. Polyurea greases offer excellent pumpability and act as an excellent sealing barrier to prevent contamination and corrosion. It can work in high temperatures and increase the lifetime of the bearing in CC.

Electric powered motors have double sealed bearings, and normally they do not require regreasing. However, some bearings being open require it to be re-lubricated periodically to replace grease that has deteriorated or leaked away. Polyurea grease has become the maximum endorsed grease in electric powered motors because they can

• Lubricate at high temperatures
• lessen friction
• protect bearings against corrosion
• Act as a seal to save you dirt and different contaminants

Many bearings require periodic renovation to prevent untimely failure, but many others require little maintenance like sealed bearings. Those incorporate seals to preserve the dirt out and do not require re-lubrication. Based on these necessities, lubrication engineers advocate a Polyurea grease, due to its outstanding lubrication residences in a huge temperature range. It also offers extraordinarily long life with sealed bearing designs.

While deciding on the perfect grease for your bearings that are exposed to temperatures above 120°C, polyurea thickened greases are top-rated.

Polyurea Grease is also recommended for…

Electric powered vehicles, excessive-temperature pump bearings and antifriction bearings running at high speeds, car wheel bearings, chassis elements and underhood systems, air conditioner compressor, snatch bearings, water pumps and pulleys.

What to expect from polyurea greases…

• Polyurea greases provide load-supporting capability without degrading the thermal stability of the grease at high temperatures.
• These greases exhibit a median life of about three to five times better than the lithium based greases.
• Polyurea greases have a tendency to have very good water resistance, top mechanical stability and might exhibit high-shear balance.

Molygraph’s grease has the advantage over other greases that it is effortlessly retained within the bearing arrangement, mainly where shafts are inclined or vertical. It additionally contributes to stopping the association to contaminants and moisture.

When choosing a grease, consider these most crucial factors:

• Consistency, working temperature, viscosity of the base oil,
• Rust inhibiting properties and the load supporting potential

Molygraph’s specialty lubricants can reduce your maintenance costs successfully. High-class Molygraph’s lubricants can play an important role in your company by mitigating the effects of wear and tear of the equipment.

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