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Traditional organic coatings which provide cathodic protection such as zinc-rich coatings exhibit several major drawbacks. To achieve electrical conductivity zinc-rich coatings rely on tangential contact between zinc dust particles. This results in over pigmentation of the binder exceeding the critical pigment volume concentration of the resin system. This results in an inferior coating with poor physical and mechanical properties.
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With increased demands placed on anti-corrosion primer coatings, whether solvent or water based, formulators are continually searching for ways to improve performance. Anti-corrosion, suspension of heavy pigments and fillers, achieving high film build, improving mechanical strength are properties which are desired to impart improved protection and can stability in severe environments.
The use of nanotechnology for enhanced coating performance has come to market for a number of applications. Such coatings cover the range from self-assembly of liquid coatings into multilayer coatings or patterned coating films, to use of various additives.
For the hospital administrator who is concerned with meeting the newer CDC (Center for Disease Control) and JCAHO (Joint Commission on Accreditation of Healthcare Organizations) protocols without sacrificing aesthetics and durability, there are new developments in architectural coating technologies for targeted hospital environments that require a higher frequency of cleaning with harsher disinfectants.
Two component spray polyurea systems are fast reacting and provide quick return-to-service coatings. Aromatic polyurea coatings have good physical properties but discolor upon exposure to UV light due to the aromatic content. Some of these aromatic systems have been coated with an aliphatic topcoat to provide the desired color stability.
Solventborne 2-pack (2K) epoxy-amine coating systems have for many years been commonly used to formulate high performance protective coatings such as metal anti-corrosion primers and concrete floor coatings. However, due to the concerns linked to their high volatile organic compounds (VOC) contents, waterborne alternatives with comparable performance are needed.
On October 4, 2011, SSPC held the inaugural meeting of a new committee developed to address commercial coatings and flooring issues. The committee is called, “C3 Commercial Coating Committee (Architectural, Commercial, Institutional).” The committee agreed to address five topic areas: field cleaning and painting, paint materials, flooring, thin film air/vapor barriers on Concrete Masonry Unit (CMU), and commercial contractor certification. Key concerns in each of the topic areas were identified which resulted in the following scopes and work activities.
With new regulations restricting the use of toxic metals and chemicals, the marine coating industry is in need of new coatings. Ideally, these new materials should be non-toxic and biologically inert but still prevent the adhesion of marine life. The coatings should be easy to apply, cure rapidly and be relatively tough elastomers.
An overview of the NSRP Surface Preparation and Coating Panel’s (SPC) mission to reduce the cost of building, repairing and maintaining US Navy ships. The work the NSRP program does as NAVSEA’s industry partner. It is whom we are, how we work and examples of our work that have been implemented on the deck plates. SPC is NAVSEA’s industry partner in preservation.
Coatings designed for heavy duty applications in the maintenance and protective coatings market are exposed to aggressive environments such as aggressive chemical solvents, marine atmospheres, UV light, abrasion, among others. In the US as well as other areas of the world, coatings designed for these applications have been primarily solvent-borne.
Several coating systems and designs were chosen to protect a concrete chamber with side walls coated with a polyvinylidene fluoride (PVDF) material. When polyurea was identified as the coating to be used at this engineering pilot plant, which contains harsh caustic chemicals in conjunction with PVDF coated panel walls; an extensive research was conducted to determine which method will be utilized to create a seamless protective film between these two systems.
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.