Polyurea is a synthetic polymer obtained from the response of a diamine with a diisocyanate, polymerization response is really comparable to polyurethane one, but in case of polyurea, resulting link is a “urea”, so it is called polyurea.
By this link we get from creating molecular structure an insensitivity to moisture, hence making the polyurea (if pure) the very best waterproof membrane.
We state “if pure” due to the fact that 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 chart plainly shows the distinction.
Molecular structure entirely insensitive to wetness. Pure polyurea does not react with water making it the very best waterproofing material.
Isocyanate + Polyol + Polyamine
A polyol participates in the molecular structure of the hybrids, which gives it properties halfway in between pure polyurea and polyurethane.
Isocyanate + Catalyst + Polyol
Polyurethane needs a driver in its structure which adds an extra molecular bond. Excellent waterproofing product however with lower mechanical properties than polyureas.
Polyurea types (pure).
Depending upon polyurea chemical structure, it could be of 2 types: aliphatic or aromatic.
The fragrant polyurea is more solid and not withstands UV exposure, triggering some discoloration and loss of shine, which is not advised for applications “deal with 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 expenses, it makes it a polyurea of greater rate variety.
The application of the polyurea is usually performed in hot state; for that is needed a hot spraying plural parts (2-components) equipment under high pressure (type GRACO Reactor E-XP2). This devices can offering a pressure of 2700 psi at a temperature of 70 ° C. This sort of polyurea dry just in 3 or 4 seconds as soon as applied.
There is likewise the called cold polyurea or polyurea cold applied, it not requires a spraying equipment since it is processed manually utilizing a rubber float, spatula or trowel. This polyurea takes longer to dry than faster one hot sprayed.
Benefits and Properties of Polyurea.
There are lots of advantages and properties of polyurea membrane, then the most important detail:.
membrane without joints or overlaps and of optimum flexibility – as much as 600% elongation.
Polyurea properties make it a product for applications where waterproofing, defense and resilience are fundamental. The limitless possibilities for polyurea pigmentation are a clear benefit in those applications where the visual aspect plays an essential role. The versatility and adhesion of the polyurea enable use in practically any application requirement waterproofing, coating and/ or protection can include: waterproofing and corrosion security on steel, concrete and many other supports.
At Polymer World, we are continuously innovating in the development and advancement of new items and the improvement of existing formulations. Currently, we have different coatings according to your needs. Contact us for more info.