Coating is dense, tough, full bright, colorful without yellowing and pulverization, anti-aging, with excellent weather resistance luster and color retention and decoration.
Adhesive strength 11.3Mpa
Impact resistance ≥50kg•cm
Temperature variation -30------+150°C
Wear resistance(700g/500r) 10mg
Acid resistance 35%H2SO4 or 15%HCI, 30d no rust no bubbles no peel
Alkali resistance 30%NaOH, 30d no rust no bubbles no peel
Salt resistance 100g/L, 30d no rust no bubbles no peel
Salt spray resistance 2000h no rust no bubbles no peel
Oil resistance 0# diesel Crude oil 30d no rust no bubbles no peel
One of polyurea’s most unusual properties is its short cure time. Pure polyurea can set up in 15 seconds or less. In fact, the traditional application method is spraying with a plural-component impingement gun with mechanical purging. Newer formulations, however, have somewhat longer cure times and can be applied using a squeegee followed by backrolling. Those products have pot lives of 15 to 60 minutes, are dry to the touch after about four hours, and can accept regular foot traffic after about 24 hours.
Project completion time is minimized in another way, too. The coating can be applied to the full desired thickness in one layer. Typical applications are 60 mils to120 mils thick, but layers outside that range are also possible. Eliminating the need to apply multiple coats to achieve full thickness reduces the true cost of the system. The direct cost of labor is less, as is down time for the facility。
Polyurea formulations are either 100 percent solids or very close to it. With little or no solvent content, the products are nonflammable and emit little or no odors or VOCs during application. “Being 100 percent solids, it’s a closed-molecule system,” says Jose Ibarra, owner of Crown West Inc., the West Coast distributor for Crown Polymers. “It doesn’t bleed, it doesn’t open up, it doesn’t allow for growth of algae and bacteria.” This makes polyurea a good candidate for coating floors in places like hospitals and food-processing plants. It can even be applied overnight or while the facility remains in operation.
There’s another advantage to having little or no solvent content. “Coatings that are very high in solvents have to be applied in such a way that the dry-film thickness meets the specification required for the job,” explains Mark Glendrange, technical director for Versatile Building Products. “The film thickness wet is equal to the film thickness dry with the polyurea.”
Polyurea coatings can be applied successfully at any reasonable temperature, from near freezing to more than 100 degrees Fahrenheit. They are also much more tolerant of humidity than other coatings. “When you spray urethanes or nonpolyurea type technologies [in humid air], the density of the coating will change. You can have a less dense, or more permeable, product, whereas the pure polyurea systems cure and have the same density under the wide range of humidity conditions,” Loomis says.