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As global environmental regulations continue to tighten restrictions on VOC-containing coatings, the need for hydrolytically stable additives in waterborne coatings has never been greater. Alkoxysilanes are a class of widely used additives in the coatings industry, as they act as adhesion promoters between organic coatings and inorganic substrates. Given the high moisture sensitivity of alkoxysilanes, most silane additives rapidly undergo condensation in waterborne coatings, leading to gelling of waterborne coatings within the first few weeks or months on the shelf.
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A test protocol was developed to provide an assessment of the effects of various film defects as well as to perform post-exposure qualitative and quantitative evaluations on eight different coatings systems.
Insulative coatings are prompting significant interest with increasing environmental and safety awareness and sensitivity to energy efficiency. Aerogels are the best thermal insulators in the world. Cabot’s aerogel has a thermal conductivity of 12mW/m-K (compared to still air or PU foam at 26mW/m-K) and is currently being used extensively in day lighting and oil & gas applications.
Corrosion can seriously damage the substrate and can lead to significant repair or replacement costs. Good corrosion protection for metal coatings is traditionally achieved through two component (2K) systems. However, they show certain disadvantages that do not exist for one component (1K) systems.
Achieving high performance with waterborne acrylic latex DTM coatings often requires a balancing act to be performed by both the polymer scientist designing the latex polymer and the coating scientist formulating the coating. A successful coating is defined by a set of critical properties while in the paint can, during application, and ultimately in its performance throughout its service life.
The use of sustainable materials in the flooring market has gained widespread interest in recent years. Bio based raw materials contribute significantly to these efforts and are used to prepare environmentally friendly coatings. Castor oil-based emulsions are used as polyols in waterborne polyurethane coatings. These systems have outstanding chemical resistance and good durability. But they have inherent issues like very short pot life, poor appearance / flow properties, and delayed early hardness development.
Published percent volume solids data have been used for years by painting contractors,vcoating manufacturers, and inspectors to calculate the target wet film thickness to apply.
The Energy Innovation Center’s approximately 80-year-old concrete floor had significant divots and was badly spalled and cracked. The concrete floor, often referred to as “The Racetrack” due to its oval shape, serves as the main hallway to a newly renovated technology hub and needed significant structural and aesthetic work. The re-finished floor had to offer durable functionality as well as blend into the neo-industrial look of the re-tasked building.
The United States Army and Marine Corps (USMC) paint their vehicles with the Chemical Agent Resistant Coating (CARC) system. This system consists of a pretreatment, an epoxy primer, and polyurethane topcoat, similar to many other industrial paint systems, but with added functional requirements (e.g., chemical agent resistance, camouflage, and signature reduction) unique to these paints. The systems that utilize these coatings are also designed for specific capabilities, of which corrosion is usually a lower priority. Lastly, the vehicles and equipment of the Army and USMC typically operate in harsh environments, which are highly corrosive.
This paper gives an update on the latest developments of the new generation of waterborne Polyurethane Topcoats (PU topcoats) for flooring which were presented during the annual SSPC meeting October 2003. Topcoats are commonly used in the construction industry over functional floor coatings or as sealers for concrete.
As we continue to move towards a solvent free society and further into waterborne there are 2 classes of pigments that are more important than ever. Complex inorganic pigments and IR reflective pigments offer outstanding properties. The IR reflective pigments reduce the thermo binder degradation therefore giving the waterborne resins longer durability.
Sol-gel coatings offer excellent properties such as scratch resistance, barrier properties, outdoor stability and high thermal stability. However, the precursors (silanes) used for these coatings are very expensive and require special care for handling and application on substrate. One approach to solve this problem is the incorporation of conventional organic polymer as the organic modifying component in silane coating formulation. Incorporation of organic polymer will reduce the cost and will make sol-gel coatings readily acceptable in industry.