Polyurea description
The polyurea is a synthetic polymer obtained from the reaction of a diamine with a diisocyanate, polymerization reaction is very similar to polyurethane one, but in case of polyurea, resulting link is a “urea”, so it is called polyurea.
By this link we get from generating molecular structure an insensitivity to moisture, thus making the polyurea (if pure) the best waterproof membrane. It is known for its rapid curing time and high strength, making it useful in a variety of industrial and commercial applications, such as construction waterproofing, coatings for truck beds, industrial flooring, and tank linings. Additionally, it can be used as a sealant and insulation material.
Polyurea is a waterproofing material that is often used in industrial and commercial settings to protect surfaces from water damage. It is applied as a liquid coating, which then quickly cures to form a durable, waterproof barrier. This can be used for waterproofing roofs, foundations, decks, and other surfaces. Also used to seal concrete structures, such as swimming pools, water tanks and retaining walls. Polyurea is known for its excellent resistance to water, chemicals, abrasion and impact, which makes it an ideal option for waterproofing surfaces that are exposed to harsh conditions.
We say “pure” because in the market there are numerous polyurea-called “hybrid”, which are a mixture between polyurea and polyurethane. These membranes do not have the same mechanical properties as the pure polyurea
(elongation, abrasion resistance, etc …). The following graph clearly shows the difference.
Pure Polyurea: Isocyanate + Polyamine
Molecular structure completely insensitive to moisture. Pure polyurea does not react with water making it the best waterproofing material.
Hybrid Polyurea: Isocyanate + Polyol + Polyamine
A polyol participates in the molecular structure of the hybrids, which gives it properties halfway between pure polyurea and polyurethane.
Polyurethane: Isocyanate + Catalyst + Polyol
Polyurethane needs a catalyst in its structure which adds an extra molecular bond. Excellent waterproofing material but with lower mechanical properties than polyureas.
Polyurea types (pure)
Depending on polyurea chemical structure, it could be of two types: aliphatic or aromatic.
The aromatic polyurea is more tenacious and not resists UV exposure, causing some discoloration and loss of shine, which is not recommended for applications “face side”. On the contrary, aliphatic polyurea is resistant to UV radiation and it is excellent as a finish coat, because of its raw materials high costs, it makes it a polyurea of higher price range.
Polyurea application
The application of the polyurea is normally performed in hot state; for that is needed a hot spraying plural components (2-components) equipment under high pressure. This equipment is capable of providing a pressure of 2700 psi at a temperature of 70 ° C. This kind of polyurea dry only in 3 or 4 seconds once applied.
There is also the called cold polyurea or polyurea cold applied, it not requires a spraying equipment because it is processed manually using a rubber float, spatula or trowel. This polyurea takes longer to dry than faster one hot sprayed.
Advantages and Properties of Polyurea
Polyurea has several advantages over other waterproofing materials:
Rapid curing time: Polyurea can cure in just a few seconds, which means that surfaces can be quickly protected and put back into use.
High strength: Polyurea is known for its high strength and durability, making it an ideal option for waterproofing surfaces that are exposed to heavy traffic or other harsh conditions.
Chemical resistance: Polyurea is highly resistant to a wide range of chemicals, making it a suitable option for waterproofing surfaces in industrial settings.
Flexibility: Polyurea can be applied to a wide range of surfaces and is suitable for use on both smooth and irregular surfaces.
Versatility: Polyurea can be used for waterproofing, coating, insulation and repair.
Elongation: Polyurea has high elongation properties which allow it to move with the substrate and avoid cracking.
Temperature resistance: Polyurea can resist high and low temperatures and maintain its flexibility over a wide range of temperatures.
Polyurea uses
Polyurea properties make it a product for applications where waterproofing, protection and durability are fundamental. The endless possibilities for polyurea coloration are a clear advantage in those applications where the aesthetic aspect plays an important role. The adaptability and adhesion of the polyurea allow use in almost any application requirement waterproofing, coating and / or protection can include: waterproofing and corrosion protection on steel, concrete and many other supports.
Polyurea varieties
In Sinomaco, we are constantly innovating in the creation and development of new products and the improvement of existing formulations. Currently, we have different membranes according to your needs, kindly contact us to get your product in need.
Post time: Nov-05-2024