This document describes an ambiant-cure epoxy-siloxane coating, exhibiting excellent corrosion resistance, substrate adhesion, flexibility, weatherability and superior chemical and impact resistance after curing.
The chemical combination of Epoxy and Siloxane results in polymers with higher performance characteristics than can be achieved by the physical combination of all polymers. The chemical combination provides the basis for the joined polymeric strength, weathering durability, high temperature properties, and radiation resistance, gloss and color retention and corrosion protective properties of the polymers, whilst overcoming the brittleness of inorganic structures.
Possible substrates include: concrete, cementious products, arhitectural blocks, internal / external pipes, tanks, containers, off-shore oil drilling platforms, metallic framework, bridges, gas turbine engines, heat exchangers, interior / exterior of ships and aerospace equipment.
The cost of corrosion in the U.S. piping industry is more than $8 billion annually. To eliminate this problem, approximately 10% of all new U.S. steel pipes are treated to resist corrosion. For the same reason, expensive corrosion-resistant stainless steel pipes and pipe lining are also being used.
Oil and gas well pipes, normally consist of relatively low cost, low carbon steel susceptible to hydrogen embrittlement, hydrogen sulfide induced corrosion, and chloride stress corrosion and cracking. While efforts have been made in the past to overcome such problems, they have not met with wide acceptance. For example; while the entire pipe, or pipe liners may be formed from stainless steel, this is a far too costly solution. Stainless steel liners have been proposed but it has been found that hydrogen diffusing into the clearances between the liner and pipe bore causes problems such as hydrogen embrittlement, and deformation of the liner when the hydrogen expands.
Biro Technologies provides a more cost-efficient, more effective solution for internal pipe coating, a new generation of Epoxy-Siloxane Zinc primer and Epoxy-Siloxane top coatings that are in every way superior to the old coating products.
Contamination of exposed structural surfaces with chemical or biological material can occur in both civilian and military contexts. Contamination can occur accidentally, such as during the conveyance of hazardous materials from one site to another, or can occur on purpose, such as in chemical or biological warfare. Such materials can remain for a significant period of time on exposed surfaces such as equipment, vehicles, aircraft, buildings, etc.
Photocatalytic coating composition containing Epoxy-Siloxane polymer that hold the photocatalyst in place without degrading the desired performance of the coating.
The coating may be applied by conventional coating methods to organic or inorganic structured surfaces where photocatalytic activity is desired.
The coating after dries leave an adherent, flexible, durable, and long-lasting photocatalytic coating having a large surface area and exhibiting high surface activity against pathogens and pollutants such as bacteria, viruses, mold, fungi, and volatile organic compounds.
Photocatalytic coating the solution for self cleaning, self-decontaminating and anti-bacterial application.
Ice build up is a serious problem and major economic impact in the aircraft industry.
Ice-phobic coatings could benefit the Aircraft Industry, NAVAIR and Air Force for de-icing composite and aluminum wings and fuselages. With respect to NAVAIR, aircraft de-icing is an important function at the many Navy facilities that support aircraft operations. Because of the high cost of purchasing deicing fluid, and the potential negative impact of glycol discharges on the environment it is optimal to minimize the volume of propylene glycol or ethylene glycol used in its aircraft de-icing operations.
Ice-phobic coating significantly outperforms other ice-phobic coatings, providing measureable economic and environmental benefits. Ice-phobic coating significantly reduces ice adhesion when applied on aluminum surfaces compared to other commercially marketed ice-phobic coatings
The ice-phobic coating could be applied as a very thin film to aircraft surfaces without significantly increasing the weight.
Epoxy-Siloxane Coatings Product Specifications
|VOC (EPA method 24):||0 gram/liter|
|Curing mechanism||chemical reaction|
|Application methods:||Spray, roller and brush|
|Thinning:||alcohol, aromatics and esters|
|Dry film thickness per coat:||50-100 microns|
|Theoretical coverage 4 mil:||400 sqf|
|Drying times (20°C)||To touch 5-8 hour|
|Recoat/topcoat time (20°C)||8 to 12 hours|
|Flash points:||A part: 252 oC /485 oF
B part: 96oC / 205oF
|Shelf Life:||2 years for unopened containers|
Improvements achieved with the Epoxy-Siloxane Coating are:
- 100% solids, zero VOC
- high cross linking density
- improved substrate wetting
- reduced effects on health, safety and environment
- significant improved weathering
- outstanding corrosion resistance
- excellent resistance to nuclear radiation
- excellent chemical resistance
- excellent defense against graffiti
- excellent heat resistance
Factors contributing to cost savings using Epoxy-Siloxane Coatings are:
- Application cost saving factors:
– less number of coats
– reduced man-hours
– increased productivity – faster turn around times
– minimized scaffolding
- less disruption to other trades
– reduced coating weight
– reduced waste disposal cost
- Performance factors:
– coatings system life extended
- Health, Safety and Environmental aspects:
– reduced risk of industrial accidents
– reduction of waste
– reduced VOC emissions
– contains no isocyanates or lead chromates
Epoxy-Siloxane Corrosion Protective Coating
For many years the conventional anti-corrosive paint systems for long lifetimes has been to utilize zinc primers. The type of primer normally specified has been zinc ethyl silicate.
The reason for using this type of technology giving zinc-zinc metal contact and, consequently, excellent cathodic protection properties akin to those obtained from galvanizing.
The new Epoxy-Siloxane zinc primer and Epoxy-Siloxane finish coating has many improvements comparing to the zinc ethyl silicate primer such as:
– Zero VOC
– Excellent adhesion
– Surface tolerant (surface preparation may be less than ideal)
– Much higher flexibility
– Long shelf life (2 years)
– Simple processing (no hydrolysis)
Typical uses of Epoxy-Siloxane zinc primer and Epoxy-Siloxane finish coating are to protect ferrous surfaces in aggressive atmospheres against corrosion, such as: industrial and marine atmospheres (ship building, oil drilling platforms, harbor installations) Chemical attack (internal coating of tankers, containers, pipelines), bridges, structural steel etc.
Defense against graffiti
Epoxy-Siloxane coatings are relatively new and offer an extremely long-lived surface from which graffiti, fly-posters and other soiling can be removed easily and repeatedly, using safe and mild agents, without the loss of properties, performance or appearance of the coating itself. This type of coating has release properties similar to those of non-stick domestic kitchenware. Any soiling can easily be removed using aqueous surfactant/detergent mixtures, or at worst, benign chemical mixtures which have no effect on the coating itself, resulting in a truly permanent anti-graffiti coating.
Epoxy-Siloxane Coating offers an excellent defense against graffiti and is easily cleaned without leaving a shadow after cleaning
High energy neutron radiation is present in nuclear reactors, which can lead to degradation processes in the materials of critical components.
Under the effect of neutron bombardment, the substance in Epoxy-Siloxane coating are not converted into radionuclides and has no substances in the matrix which would have an adverse effect on the reactor.
Epoxy-Siloxane Coating is essentially unaffected by nuclear radiation and has an excellent rating for decontamination. The coating performed without any defects on irradiation to a cumulative dose of 5500 megarad as tested.
Organic coating systems show considerably lower decontamination factors with typical values of 500 to 1000.