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Polysiloxane Coatings

Polysiloxane Coatings Polysiloxane coatings are industrial protective and maintenance coatings that used in services characterized by abrasion, chemicals, extreme UV and high temperatures. The term polysiloxane refers to a polymer with a silicon-oxygen backbone. The silicon-oxygen backbone is much more resistant to the effects of UV radiation than the carbon-carbon backbone of organic polymers. Polysiloxanes have excellent aesthetic weathering attributes in terms of gloss retention and chalk resistance properties. They exhibit excellent abrasion and corrosion resistance, good chemical resistance, good anti-graffiti properties, resilience to dirt pickup and are formulated with low VOC‘s.  Advances in polysiloxane chemistry have resulted in the development of three major categories of this type of coating: Inorganic Polysiloxanes: Typical inorganic polysiloxanes cure by hydrolytic polycondensation. Formulated with the proper selection of additives and pigments, coatings can resist temperatures of approximately 1,400°F (760°C). Variation of pigment creates coatings with excellent solvent resistance. Epoxy-Polysiloxane Hybrids: Formulation with aliphatic epoxy resins, silicone […]

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Polyurethane Coatings

Polyurethane Coatings Polyurethane coatings are one or two-package systems. For two-package systems, one component is an isocyanate and the other a polyol component. Because of the reactivity of the isocyanate, polyurethanes are moisture sensitive, and the gloss may drop when the wet film is exposed to high humidity. One component types cure with moisture supplied from the atmosphere. Polyurethanes are chemical reaction coatings and available in a variety of formulations; giving rise to a variety of properties from very soft polymers to very hard cast materials. There are two major types of polyurethane coatings: aromatic and aliphatic. Aliphatic polyurethanes are more resistant to UV attack and are typically used in exterior coating formulations. Aliphatic isocyanates, when used in the formulation of polyurethanes, provide coatings with excellent gloss and color retention. Aromatic polyurethanes are extremely tough and have better chemical resistance in immersion than aliphatic types, but chalks rapidly in sunlight. They […]

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Dealing with Graffiti

Dealing with Graffiti-Anti-Graffiti Coatings Graffiti should be addressed by some method other than painting over it. Painting over graffiti only presents the “artist” with a new canvas, which usually results in additional defacement. The affected surfaces should be protected, for example, with commercially available anti-graffiti coatings. Anti-graffiti coatings come in two forms: sacrificial and non-sacrificial. Sacrificial anti-graffiti coatings are usually wax based products that form a clear protective film over the treated area and shields it from spray paint or other markings to penetrate into the substrate. Tagging is removed with specialized cleaners and hot pressure water and the anti-graffiti coating must be reapplied on the affected area. Non-sacrificial graffiti-resistant coatings are usually polyurethane based products that applied and function in the same manner as the sacrificial but there is no need to be reapplied after the removal of graffiti. Both coatings can be applied over painted and unpainted surfaces […]

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Coating Defects 2

Coating Defects 2-Common Coating Failures and Causes Blistering Blistering is dome- or circular-shaped projections of the coating film held away from the substrate Blisters can have irregular shapes, depending on the cause. They may be filled with pure water, solvent, caustic, gas, oxygen, crystals, or rust. The basic cause is a loss of adhesion in localized areas. They can be any size and distribution. Numerous factors can lead to blistering, but the most common is a contaminant of some kind left on the surface after cleaning. In atmospheric service, the blisters may be caused by coating over: oil, moisture, grease, dirt, dust, soluble pigments and retained solvents.In immersion or buried service, blistering can also be caused by electro-endosmosis due to: an overactive cathodic protection system, stray currents, osmosis caused by trapped soluble salts Do not to break blisters unless it is to test them or their contents to determine cause. […]

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Chemical Reaction Coatings

Chemical Reaction Coatings Chemical reaction coatings are usually the most durable. They cure by polymerization (cross linking) reactions between at least two chemical entities. These chemical entities are mixed together just prior to application. After mixing, the cure molecule attaches to the base molecule, and then another base molecule attaches to another spot on the cure molecule, and so on, until nearly all of the molecules are linked together as a single molecular chain. This process may take several days or even several weeks before the film develops all of its properties. Chemical reaction coatings cover a vast range of chemistries such as epoxies, polyurethanes, polyureas, polyaspartics, polysiloxanes etc. They are generally packaged in two separate containers that are mixed in ratios range from 1:1 to 100:1 or more, depending on the material’s chemistry to initiate the reaction. Components must be combined in the specified proportions in the manner specified […]

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