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Pittsburgh, PA, United States

Burgess R.A.,KTA Tator Inc
Journal of Protective Coatings and Linings

Solvents are among the liquid components of coatings commonly referred to as the volatile vehicle. Upon application, and for some time afterward, the solvents evaporate, leaving the vehicle solids behind, which form the dry and cured coating film. The first, solvency, relates to the ability of any given solvent to dissolve a resin and produce a homogeneous solution. Solvency is also an important property because it controls the coating's viscosity for application purposes. The applied coating film may require both rapid and slow solvent release. Rapid release is primarily due to evaporation, the first stage of solvent release. Slow release is primarily controlled by solvent diffusion from the applied coating film. Several products may be listed for the same coating. Determining solvent selection will depend on the resin type, the ambient temperature, and the volatile organic compound (VOC) content. Source

Helsel J.L.,KTA Tator Inc
Journal of Protective Coatings and Linings

Proper surface cleaning is one of the most important process in the coating process. The surface preparation should reference recognized industry standards such as those published by SSPC. Once a surface is cleaned of contaminants various methods to prepare surfaces to the specified level of cleanliness are used. The degree of cleaning required by a given project specification is dependent on the service environment. In making selections for surface cleaning and coating, it is critical that these items are properly matched. Surface preparation methods include hand and power tool cleaning, abrasive blast cleaning, and waterjetting. Source

Tator K.B.,KTA Tator Inc
Materials Performance

The application of nanotechnology in coatings industry is reviewed. Nanotechnology applications within coatings today include the use of extremely small nanoparticles as raw materials, the development, in situ, of extremely fine nanostructures, coatings comprised of extremely thin nanofilms, such as deposited films. There are a number of areas where coatings nanotechnology is currently commercially available, such as, self-cleaning coatings, depolluting coatings, ultraviolet (UV) light protective coatings, anticorrosion coatings, insulative nanocoatings, water sheeting coatings, water beading coatings, antifouling coatings, and anti-graffiti coatings. Self-cleaning coatings incorporate titanium dioxide (TiO2) nanoparticles, which are photocatalytic. TiO2 and nano-size TiO2 pigments in coatings provide good resistance to UV radiation degradation. Zinc-rich coatings are available with carbon nanowires throughout the coating cross-section. Source

Corbett W.D.,KTA Tator Inc
Journal of Protective Coatings and Linings

The article discusses how to measure dry film coating thickness as per SSPC-PA 2. SSPC-PA 2 addresses two types of DFT gages, both of which are supplied by a variety of manufacturers. To help assure the reliability of the coating thickness measurements, ASTM D 7091 describes three operational steps that must be performed before taking the measurements. Verification of gage accuracy is typically performed using certified coated thickness standards. Adjustment of Type 2 gages to compensate for substrate characteristics is typically performed using certified shims. Dry film thickness gages are calibrated by the equipment manufacturer, its authorized agent, or an accredited calibration laboratory. A test certificate or other documentation showing traceability to a national metrology institution is required. Source

Huntley R.,KTA Tator Inc
Journal of Protective Coatings and Linings

An American tobacco company used the warehouse buildings for the fumigation of the tobacco, during which the entire interior of the building is filled with a gaseous insecticide that kills tobacco-damaging insects. The company chose to completely seal the building using a polyurea coating system as once the fumigation chemicals escaped. The system chosen for application consisted a one-coat epoxy primer, followed by a coat of the polyurea product and a polyurethane topcoat. The 100% solids polyurea material, a two-component coating with a one-to-one mix ratio and a dry-to-touch time of 45 seconds, was designed to bridge cracks up to 1/8-inch wide. Several problems arose during the coating application to the exterior of the fumigation building. A site visit was scheduled by an independent coatings consultant to examine the walls of the subject fumigation building. The examinations disclosed that the coating system consisted of a bluish-gray brittle topcoat with underlying flexible gray coats and an intermittent yellow translucent brittle coating. Source

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