polyurea

what is polyurea

Two-component elastomeric coating materials for substrate protection from water ingress and corrosion prevention.

Derived from the reaction product of an Isocyanate component & 

polyetheramines through one-step polymerization

Wide variety of formulations catering for different requirements for 

mechanical, physical and chemical properties

Exponential rise in the marketplace in the past 10 years or so throughout the World especially in the USA and Asia

key components of polyurea 

A component:

 Isocyanate

B component: 

Polyetheramine

 Amine chain extender

 Pigments

Flame retardants

Defoamer

Other property enhancement additives

Definition of polyurea

A Polyurea coating/elastomer is that derived from the reaction product of an isocyanate component and a resin blend component. The isocyanate can be aromatic or aliphatic in nature. It can be monomer, polymer, or any variant reaction of isocyanates, quasi-prepolymer or a prepolymer. The prepolymer, or quasi-prepolymer, can be made of an amine-terminated polymer resin, or a hydroxyleterminated "polymer resin

 Advantageous Properties Of Polyurea

- Short gel time in the order of several to 30 seconds

- Thickness build up in multiple layers through single coat application

- High tensile strength in the order of 10 – 30 MPa

- Large elongation at break (in the order of a few hundred to 1000%

- High tear strength in the order of 50 to more than 100 MPa

- High abrasive resistance

- High impact resistance

- Excellent resistance to chemical attack

- Breathable

- High thermal stability

- High temperature shock resistance

Areas for Application of Polyurea in Aged Buildings

- waterproofing for roofs, water tanks and any other features that are subject to water ingress

- Protection for features that are subject to attack by chemical ingress 

Protection of pipelines -

Strengthening of structural elements such as beams -

columns and slabs -

Anti-graffite coatings -

Caulk/joint/sealant materials -

Parking decks -

Other Applications of Polyurea

Airport -

Tunnel lining protection -

Basement -

Protection of foundations -

Protection for sewage treatment tanks and pipes -

 Protection and repair of concrete for Bridges and Marine structures -

Protection of steel, aluminum and fiberglass used in bilge liners of marine vessels -

Aquariums -

Swimming Pools -

Water Parks -

Many many other applications of waterproofing and  protection from chemical attack -

What is required to spray polyurea coating

High pressure (140 – 220 bar -

- Special spray machine and nozzle (Two components (isocyanates and amines) being mixed inside the impingement mix/spray gun. No pre-mixing or hot potting is required))

(High processing temperature (68 – 90°C -

A reliable, experienced and responsible contractor -

 Highly trained and qualified applicator -

Careful selection of polyurea material for the intended purpose -

Preparation work for spraying polyurea

- Check exposure conditions and humidity conditions of the structure and area in the vicinity for application

- Check/calculate the area of application and prepare adequate materials with consideration of wastage based on past experience

- Prepare appropriate equipment and set up

- Organize experience and competent workers

- Prepare all necessary spraying and safety equipment

- Check ambient temperature and relative humidity

Substrate preparation

• Inspect for defects at the substrate and repair all defects first before applying polyurea

• Clean up the substrate until it is free of dust, grease, loose particles, contaminants, etc.

• Spray a layer of primer on the substrate to block pinholes and moisture evaporation from the substrate

• Avoid ponding of primer or water on the substrate

• Spraying of polyurea can be commence when the primer becomes tacky dry

Safety Precautions for Spraying Polyurea

• Polyurea is not a toxic material itself. It is USDA approved for incidental food contact, and 

approved for potable water. It's 100% solids (no solvents) meaning it gives off no VOC's during installation

• The diamine is corrosive to the eyes and skin. Skin sensitization may result from prolonged or repeated contact with cycoaliphatic diamine, resulting in rash, itching, swelling and other symptoms common to allergic dermatitis. Safety goggles, gloves and protective clothing are therefore required.

• Vapours are also severely irritating to eyes, nose, and throat. Safety masks are therefore required. 

Mixing and Spraying of Polyurea

• The two components (ISO and polyamine) are pumped from their storage drums into the spray machine. The machine brings the two materials to the required processing parameters (processing pressure, application temperature) and ensures the correct mix ratio (1:1).

• The two components are transferred through heated hoses with adequate length for heating to the spray gun.

• The components are not combined until they reach the mixing chamber where they mix under high pressure, starting the reaction.

• The mixed components are then sprayed onto the substrate

 OUR PROJECTS 

polyurea spray for Tanta mineral water -

(Polyurea spray for kidzania (fire building -

 polyurea spray for LEONI wiring systems (  WATER TANKS )

 sandwich panel 

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