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Two strategies for designing coatings with exceptional mar resistance
There are wo strategies are available for designing coatings with exceptional mar resistance. They can be made hard enough that the marring object does not penetrate far into the surface; or They can be made elastic enough to recover after the marring stress is removed. If the hardness strategy is chosen, the coating must have a minimum hardness. However, such coatings may fail by fracture. Film flexibility is an important factor influencing fracture resistance. Use of 4-hydroxybutyl acrylate instead ofRead More …
A short overview to summarize different scratch effects in automotive coating
When an automotive OEM looks for coatings with high-value perceived surfaces, many different test methods are used to describe the visibility of a scratch. A short overview to summarize different scratch effects follows: Scratch− a type of friction-induced damage in which a sharp object cuts the surface of a polymeric material. Abrasion− a phenomenon caused by the mechanical action of rubbing, scraping or erosion. Mar− friction-induced damage in which the material surface is compressed, causing a marking that changes theRead More …
Challenges for topcoats in Automotive Coatings
Curable or thermosetting powder coating compositions are widely used, particularly for topcoats in automotive and other industrial coatings. Basecoat/clearcoat composite coatings are topcoats that offer exceptional gloss, depth of color, distinctness of image or special metallic effects. The automotive industry has made extensive use of basecoat/clearcoat composite coatings for automotive body panels. Single-layer topcoats and clearcoats usually require an extremely high degree of clarity and gloss to achieve the desired visual effect. Furthermore, they must maintain their clarity and gloss overRead More …
TiO2 Increasing durability of coatings
Durability is a term applied to the various changes in appearance and functional value of exposed pigmented powder coatings. It includes all aspects of exterior serviceability, such as retention of color, retention of gloss, chalking, adhesion and film integrity. The initial effects are usually caused by degradation of the organic binder on exposure to sunlight, moisture, temperature change and environmental pollutants. Chalking occurs as increased amounts of organic binder are removed from the surface of the film, leaving behind exposedRead More …
Exterior architectural gloss coatings pigment selection
There are two primary types of TiO2 pigments: those which enamel grade performances below Critical Pigment Volume Concentration (CPVC), which corresponds to gloss and semi gloss powder coatings, and those improving spacing characteristics for above CPVC coatings applications (flat aspect). Exterior architectural gloss coatings pigment selection is based upon a good balance of properties associated to tight Particle Size Distribution which enables product to provide superior exterior high gloss. Within the extensive choice of pigments, the main ones for thisRead More …
Thermal Spray Powder Coatings for Resistance to Erosion
The selection of coating for erosive wear is dependant on the severity and type of erosion. For solid impingement erosion at a shallow angle of attack where the wear is similar to that of abrasion, high hardness coatings are required. For solid impingement angles near 90 coating toughness becomes more important. For cavitation and liquid impingement generally, a coating with good surface fatigue resistance is needed. The following coatings are commonly used: Cermet coatings like tungsten carbide/cobalt Chromium carbide/nickel chromiumRead More …
Reducing Wear by Using Powder Coatings
Thermal spray powder coatings have and are used in a very broad range of wear resisting surfaces and for the repair of wear resisting surfaces. The main advantage being that thermal spray coating can provide the surface properties and the component substrate material can be chosen from the bulk requirements be it strength, weight or cost without the need to consider it’s inherent wear resistance or other surface properties. Selection of the best coating for an application is not oftenRead More …
Safety control during powder coating application
SUPPRESSION EQUIPMENT The application of ” Explosion Suppression Equipment ” such as a fire extinguishing system that commonly uses halogen gases propelled by pyrotechnic devices can stop an explosion from occurring within the collection system. CONTROL OF DUST Design of the spray booth and recovery system can aid in worker safety. The booth opening, velocity of airflow must be arranged to assure the capture and containment of over-sprayed powder. The fan capacity of the recovery system must be sized toRead More …
Three primary resins used in thermoplastic powder coatings
There are three primary resins used in thermoplastic powder coating, vinyls, nylons and polyesters. These materials are used for some food contact applications, playground equipment, shopping carts, hospital shelving and other applications. Few of the thermoplastics have the broad range of appearance properties, performance properties and stability that are required in applications that use thermoset powders. Thermoplastic powders are typically high molecular weight materials that require high temperature to melt and flow. They are commonly applied by fluidized bed applicationRead More …
There are many commercially available masking materials for powder coated parts.
Masking is a very important step in the powder coatings process. It is labor intensive and expensive. The type of masking material and its properties will be important to the effectiveness of the mask and its impact on production efficiency. There are many commercially available masking materials for and powder coated parts. Tapes, plugs, caps and steel fixtures can be used. These cost and benefit issues are considered to determine the best possible way to mask a part: the cost per mask the numberRead More …
D5 Creation