Is polyuria the same as polyurethane?
While polyurethanes have been used for many years as adhesives and sealants, polyureas are relatively new to the industry. From a chemical standpoint, a polyurethane is made from the reaction of an isocyanate with a polyol, whereas a polyurea is formed from an isocyanate reacting with a multifunctional amine.
Which is better polyurea or polyurethane?
Better Durability: Chemical and UV Resistance. Both polyurea and polyurethane have high resistance to oil. Polyurea is also chemical- and scratch-resistant. Both polyurethane and polyurea can be used in exterior applications, where UV exposure is an issue – but polyurea is better than polyurethane at UV protection.
What is polyurea sealant?
A polyurea provides a chemical backbone containing amine linkages. Polyurea has been used as an industrial coating and sealant in severe environments with good chemical resistance. For example, it is resistant to hydrocarbons and hydrogen sulfide gas and immersed sewage application.
What can polyurea be used for?
There are numerous applications that benefit from polyurea coatings, including the following:
- Automotive industry and material handling.
- Pipelines, pumps and irrigation systems.
- Defense and security sectors.
- Healthcare.
- Surfaces of steel and concrete bridges.
- High pressure hot spray.
- Warm spray coating.
- Low pressure cold spray.
How long does polyurea last?
They can be installed in one-day, but will last 15+ years. Unlike other flooring options, polyurea coatings won’t require regular replacement or costly regular maintenance.
How strong is polyurea?
Polyurea is formed by reaction of diisocyanates and diamines, and it is one of the toughest synthetic polymer materials. These are some of its attributes: High strength with tensile strength higher than 5,000 psi and tear strength higher than 500 lbs/in.
Is polyurea stronger than epoxy?
In terms of overall durability and flexibility, polyurea wins over even the strongest epoxy material. Because it’s so flexible, the material can move with the concrete when there are major shifts in weight or temperature.
What’s new in polyurea adhesives and sealants?
Several new products have been developed in recent years that foretell increased demand for polyurea adhesives and sealants in the future. Nolax (Switzerland) also found that fast-reacting polyurea adhesive bonds are very well to soft and hard woods.
What is the gel time of polyurea adhesives?
The gel time of polyurea adhesive/sealant compositions is typically on the order of a few minutes, and it is consistent over a wide temperature range (-20°C to 60°C) since the polyurea polymer does not rely on a catalyst to complete the reaction. Furthermore, the cure characteristics are very uniform over a broad range of application humidity.
What are the chemical properties of a polyurea?
A polyurea provides a chemical backbone containing amine linkages. Polyurea has been used as an industrial coating and sealant in severe environments with good chemical resistance. For example, it is resistant to hydrocarbons and hydrogen sulfide gas and immersed sewage application.