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The use of polyurea-based thick film coating materials for substrate protection and corrosion prevention has taken an exponential rise in the marketplace in the past 10 years or so. When properly installed, polyurea coatings offer a variety of performance characteristics.
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In the early 1900’s, a small community in the mountains of western Maryland, installed two potable water tanks that were open top and below grade. Over the years, they began leaking water into the basements of nearby residences, so several upgrades to the tanks were planned. The upgrades included the addition of metal dome roofs, electronic security systems with fencing, and a waterproof lining system. Contractors were invited to view the facility and bid the lining system while the tanks were still in service – first mistake
This paper presented the polyurea protective project of Beijing-Shanghai High Speed Railway. It also reviewed the polyurea history in China, introduced research and development of polyurea in Qingdao Technological University. The analysis and discussion on the application problems exposed in the Beijing-Shanghai High Speed Railway project were performed in this paper.
For years, people have relied upon a variety of industry accelerated testing methods in order to predict how long a coating / lining system may be useful in service. This type of testing would include heat aging, Atlas Cell immersion testing for lining products and accelerated weatherometer testing for coating systems, just to name a few. Polyurea spray applied elastomeric materials have been no exception to this type of testing. One of the most important testing evaluations has been accelerated weatherometer exposure for products used in outdoor application areas.
The paper will outline the following: 1. Process from when a customer approaches the polyurea supplier with a set of problems they need to overcome and the important issue of understanding what the customer and the job requirements really are. 2. How to evaluate and determine if the products you have available are suitable or not. 3. The process of having the customer write specifications based on what the applicator can realistically deliver and accomplish.
Spray applied polyurea was introduced to the construction industry in the late 1980 s. By the 1990 s, polyurea floor systems were being installed using early formulations of polyurea, and spray equipment adapted from the polyurethane foam industry. Advancement in raw materials, polyurea formulations, specialized equipment and contractor expertise in recent years has provided increased opportunities for this technology to be used in a wide variety of concrete flooring applications.
Portable plural component low-pressure equipment Utilizing Synergistic Chemistry addresses untapped niche market proves to be provides added growth to the industry.
This presentation will high light the new ultra-high solids tank lining products and discuss the equipment necessary to properly apply them, giving owners the ability to return their tank to service in a very short time frame.
The spray-applied, two-component, ambient-cured polyurea, which features no VOC’s and low odor, can be applied at colder temperatures than current available coatings. This wider temperature application range extends the season for restoring outdoor concrete substrates. The technology provides quick dry times; leading to faster return-to-service and helping applicators and owners meet tight deadlines.
The polyurea technology is not new to pipelining work, with earlier basic applications dating back more than 15 years. Much of this work was either performed by hand spraying (large diameter pipe) or simple robotic systems for individual joint sections of pipe. Continued work over the years has proven that in-place pipelines can be commercially completed as well. More recent work has even shown that in addition to long, straight runs, robotic developments have allowed for lining both 45° and 90° radius bends in the pipeline system.
The polyurea technology has been developed by Texaco chemical in the 80’s. First developed for the reaction-injection-molding (RIM), it has been adapted for spray application. The development in the spray equipment in the 90’s has enabled the commercialization of 100% solid polyurea spray elastomeric coatings.