Technology

VIP ist Innovationsführer bei Beschichtungen aus Polyurea sowie bei Versiegelung, Verfugung und Reparatur von nahezu allen vertikalen und horizontalen Oberflächen. VIP Produkte schützen Betonoberflächen vor mechanischem Abrieb und chemischen Einflüssen, auf Stahl stellen sie einen langfristigen Korrosionsschutz dar. Unsere Systeme sind zudem aufgrund der schnellen Verarbeitungszeiten, der hohen Elastizitäten, extremer Temperaturbeständigkeit sowie der hervorragenden Haftungseigenschaften herkömmlichen Beschichtungen weit überlegen.

 

Fast Reaction Time
Polyurea's fast reaction time (5-15 seconds) leaves polyurethane and epoxy materials in the
proverbial dust. It is an autocatalytic polymer. With the fast reaction time, polyureas do not
easily react with humidity and moisture in substrates, so the material can be readily applied
over cold or damp substrates, such as steel, concrete, wood or PU foam. On the other hand,
when smoother flow of material is required to wet out a mold or cover an intricate carved
surface, polyureas (like polyurethanes) can be slowed down to have gel times ranging from 20-
60 seconds.
Fast reaction time is a great advantage of polyurea. In the case of facility maintenance or
rejuvenation, owners want to regain usage of the facility as soon as possible. A fast-reacting
polyurea fully cures within a few hours, whereas most polyurethane or epoxy coatings require
24-48 hours before the coated areas can be used to their full potential.
Polyurea is frequently used to protect the exterior of iron pipe, since the pipe can be recoated
"above-the-ditch" (in the field) without expensive equipment. The polyurea cures quickly and
the pipe can be almost immediately reburied without crack. Many pipelines around the world,
including the Trans-Alaska pipeline, have used this technology to speed production and keep
maintenance costs to a minimum.
Moisture Insensitivity
Where moisture or humidity is a concern, polyureas outperform any product on the market
today. Polyurethanes can be sensitive to high humidity and moisture in a substrate. As a result,
they will react with atmospheric moisture or high humidity to produce carbon dioxide gas and
cause foaming and/or pinholing in the surface. In contrast, polyureas are not affected by
moisture.
The reaction of Component A and Component B (polyamines) or a polyurea system is so fast
that the moisture reaction can't occur. Therefore, the polyurea systems are not sensitive to
moisture and humidity, and do not normally produce carbon dioxide bubbles. This is an
advantage in climates or regions with high humidity or dewpoints.
On the whole, polyureas are a more versatile protector for concrete. Recent innovations have
led to the blending of epoxy and polyurea to form materials that are ideal for below-grade
waterproofing, bridges, parking decks and flooring. Since these are slower curing systems,
aggregates such as stone, iron or quartz flakes can be added to improve traction for vehicles
and non-skid qualities for pedestrians.
Excellent Adhesion
If a substrate is moist or has condensation on it, polyurea will perform much better than
polyurethanes. Many in the industry were surprised when Texaco produced a video of polyurea
being sprayed over ice and water without affecting the reaction of the components. This
demonstration is generally not encountered in real-world applications. Applying any coating
over an excessively wet or unprimed/unprepared substrate can have detrimental effects on the
adhesion.
Organizations such as the National Association of Corrosion Engineers and the Steel
Structures Painting Council issue guidelines for properly preparing and priming surfaces. A
properly prepared surface will improve adhesion, especially for critical applications such as
moist concrete for containment lining and flooring, as well as adhesion protection for geotextile,
wood and steel. In these applications, polyurea systems will have the best results.
the heat sink typically causes application problems for steel substrates. Conventional
polyurethane systems applied to heat sink substrates could compromise the properties or
adhesion of the first pass. There are no problems using a polyurea system over prepared steel.
Superior Tensile Strength
In waterproofing applications, a low modulus and a high elongation elastomer are required to
meet the challenge. Polyurethanes have traditionally been regarded as having higher
elongation and a lower modulus than a polyurea with a similar hardness. However, the days of
polyurethanes having lower modulus than polyureas are over. Modern advances in the
chemistry mean polyureas are formulated to feel as soft and elastic as polyurethane. This, in
turn, opens the door for OEM manufacturers that produce soft "vinyl-like" skins, for example, to
choose polyurea. The new polyureas will stretch with much less force. And, more importantly,
polyureas will resist punctures and tears equally as vigorously as polyurethanes.
Low to No Volatile Content
The composite and OEM fabrication industry has seen a dramatic jump in the use of polyurea
as an alternative to unsaturated polyester vinyl esters and polyester fiberglass for open mold
part production. Automotive and off-highway body
panels, bumpers and other parts are just a few of
the parts that can easily be manufactured more
quickly and without harmful emissions. Many
manufacturers in the marine, bath fixture and
recreational vehicle industry can also turn to
polyurea as a reliable, cost effective alternative to
FRP systems. The low volatile content of polyurea
also makes it very attractive for confined
workspaces. Many local and state government
agencies are cracking down on styrene emissions.
Unlike polyester fiberglass or epoxy, no fumes or
styrene emission are associated with polyurea. Therefore, polyurea is ideal for applications
such as wall and floor coatings for the food and beverage industries.
Until recently, manufacturers have been faced with the choice of shutting down production or,
in the case of large companies, paying the fines and continuing with production in hopes there
is enough profit margin in each unit produced to keep the company operating. Modern
structural polyurea systems can offer these companies an alternative production material to
eliminate government fines and increase profits.
High Abrasion Resistance
In a highly abrasive environment, polyureas perform extremely well. In applications once
thought to require high-solids epoxies, polyureas are winning at every turn. In the rail and barge
industry, polyureas are used instead because of their superior elongation and high impact
resistance. Epoxies will crack and delaminate when exposed to constant pounding.
The durability and physical properties of polyurea have made it the system of choice for the
rapidly growing truck bed lining industry. Polyurea is sprayed in a uniform texture over the metal
bed surface. Plus, thanks to innovations in application equipment, non-professional sprayer and
retail applications can quickly turnover multiple trucks in an afternoon. Polyurea has proven its
distinct advantages over polyurethane liners.
Heat and Fire Resistance
When it comes to heat resistance and fire retardance, polyureas have the advantage over
comparably formulated polyurethane. Because of its formulation, structural/rigid polyureas have
excellent resistance to heat distortion and sagging. At the same time, polyurea maintains its
flexibility and high impact resistance. This is not the case for molded structural polyurethane
parts that are in constant close proximity to heat. Polyurethanes tend to sag. Polyureas resist
heat sag and maintain their shape.
And when the heat is really on, like in the case of fire, polyureas will naturally outperform most
other polymer resins. The resulting low smoke and flame spread is due to polyureas' molecular
structure. Exposed to constant flame for 20-30 seconds, polyurea will self-extinguish.
Long-Term Stability
Many polyureas are based on aliphatic isocyanate prepolymers that are highly weather
resistant and color stable. Products based on aromatic isocyanate prepolymers are not color
stable and will tend to chalk or darken in color with extended exposure. For a long time,
aromatic polyurea was the primary version of polyurea that was promoted to the industry. In the
mid-1990s, aliphatic and aliphatic-modified polyureas were developed. These products
revolutionized the coatings business. Now end-users could safely choose a polyurea for
applications that would be constantly exposed to sunlight, without fear of discoloration and/or
chalking.
Environmental Protection
Exposed polyurea is widely used in applications such as concrete or geotextile coatings for
secondary containment applications. Polyureas' fast cure times allow it to be rapidly applied to
a prepared substrate with minimal downtime for the facility. This has made polyurea the choice
of facility managers for walls around and floors under chemical storage of diluted acids, alkali,
salt solution, organic solvents and oils. Polyurea provides a strong barrier to spills from
reaching the environment. In this type of application, polyurea readily conforms to footings,
pipes and protrusions to form a complete seal. An aliphatic polyurethane or epoxy topcoat can
be added for aesthetics in environments that are too highly corrosive for a standard polyurea.
Conclusion
In a world of increasing environmental awareness, polyurea proves to be an effective and
economical choice for governments and businesses for their elastomeric and structural needs.
Material improvements in cure times, hardness and fire retardancy are being made everyday.
Application equipment and spray tip innovations are being introduced more rapidly than ever to
meet the demand for better, more efficient means of getting the product sprayed in place.
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