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A series of novel isocyanates based on low-free monomer TDI prepolymer technology has been developed for spray polyurea applications. Coatings formulated using these new raw materials have shown significantly higher tensile strength, modulus, abrasion resistance and tear strength compared to conventional MDI-based isocyanates.
Self-healing polymers are a new class of smart materials, which have the capability to autonomically repair themselves after damage, without the need for detection or repair by manual intervention. To expand the scope of practical applications, new self-healing chemistries have been developed and evaluated for use in a wide variety of applications including coatings.
For many years coatings based on methyl/phenyl silicone resins have proven to be one of the most effective and reliable products within the high heat and protective coatings segments. Their inorganic characters along with the methyl/phenyl modification provide outstanding long term thermal stability, attractive corrosion protection, weather resistance and good mechanical properties. In general, silicone resins for high heat applications can be categorized into two sub-groups: i) oven curing and ii) ambient temperature curing systems.In the case of typical oven cured silicone
The use of access fitting for intrusive corrosion monitoring tools is a common practice in the Oil & Gas industry; however, the Company (Petroleum Development Oman) has faced several difficulties including a recent incident during retrieval operations which has led to suspend, or significantly reduced the use of corrosion coupons and probes, decrease the frequency of retrieval, and eliminate its use in new projects.
Structure modified, nanostructured synthetic fumed silica technology was introduced more than a decade ago for improving scratch resistance and mechanical strength across coatings and adhesives / sealant industry fields. New developments now create novel design which offer environmentally sustainable improvement to anti-fouling performance in marine environments.
Departments of Transportation currently use the conventional three-coat system as the predominant choice for the corrosion protection of steel bridge structures. Eliminating one step in the coating process could potentially save time and cost associated with lane closures and traffic control costs. This research paper evaluates several two-coat systems based on the zinc-rich primer and polysiloxane top coat technology.
There is a critical need to mitigate undesirable fouling of seawater-based titanium heat exchangers (HEs) used in US Navy vessels. Heat exchangers are widely used in Navy ships to cool operating fluids and gases, and seawater is the preferred cooling medium since it is readily available. However, fouling will form while ocean water circulates through the heat exchanger tubes or plates, decreasing the heat transfer efficiency and increasing fluid resistance.
A new and versatile waterborne solid epoxy resin dispersion with good flexibility and improved shear stability is presented. When this binder is used, high performance metal primers can be formulated without the use of anti-corrosion pigments. This is highly desirable since the toxicological effects of zinc phosphate and other zinc-based salts are causing environmental concerns.
As VOC regulations continue to drive coatings development, waterborne alkyds are progressively being utilized further due to their attractive environmental profile. Advancements in waterborne alkyd chemistry have provided the first waterborne biobased resin for pavement marking coatings. Through strategic selection of alkyd monomers and the appropriate balance of the emulsification aids, a shear stable alkyd latex resin that shows exceptional performance in waterborne traffic marking formulas has been developed.
Graffiti resistant polyurethanes have been developed that do not contain surface energy modifiers such as fluorine or silicone compounds. These coatings are made from a two-component polyurethane that includes polyacrylate polyols and water dispersible polyisocyanates. The use of two components allows one to make highly crosslinked polymers with minimal organic co-solvent.
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.