Paint coating system components

The modern motor car is made from steel, zinc or zinc alloy-coated steel and some plastic parts, all of which require painting. The main component is the body shell, made from the above metals, and this is coated in a continuous production process. A full finishing system with all four coatings is usually applied for maximum protection and a high quality appearance. 

These are the most important components of paint. Coatings can be either clear or opaque (containing pigments) and either solvent- or water-based. With solvent-based paints, after application, most of the solvent is lost through evaporation. These solvent-based coatings are mostly alkyds (name derived from alkyl/acid) or modified alkyd resins. Normally they contain 30% polymer solids higher solids content is limited by the increasing viscosity of the system. 

The substitution of chemical solvents by water in paint and coating systems and also in cleaning processes creates complex evaluation issues, as the number of the various chemical components contained in the corresponding products generally increases. In addition, the release of persistent substances into the aquatic environment tends to be favoured by this. This therefore raises the question for assessing two suitable strategies containment of known hazardous substances in closed systems or substitution of the mobile solvent by complex water-based systems that are scarcely evaluable from a toxicological aspect. 

One can rationalize a need for small rubber inclusions in some of the newer approaches to waterborne and high solids epoxy coating systems. Water-thinned epoxy coating compositions are described (48) where the two-component system consists of a nitrile rubber modified epoxy resin in the epoxide component and a styrene/ butadiene/methylmethacrylate latex modifier for an emulsion-based polyamide hardener component. Showing improved adhesion, impact and water resistance, the paint has good wetting characteristics and can be formulated to a high solids content at low viscosity. 

Organic coatings are used to block the penetration of carbon dioxide or chloride ions. They form a continuous polymeric film on the surface of the concrete, of a thickness ranging from 100 to 300 pm. The binder can already be present in the liquid paint as a polymer, or the polymer can be formed due to chemical reactions between monomeric components that are mixed just before application. Modem coating systems are usually built up of several layers applied consecutively. They are compatible with the alkalinity of the concrete and are based on various types of polymers (e. g. acrylate, polyurethane, epoxy), pigments and additives, and are made suitable for application by the addition of solvents or diluents. 

Chemically blocking one of the polyaddition binder components (e.g., the polyisocyanate) gives a coating system stable at room temperature. Heat is required to deblock the component and enable cross-linking to occur. Stoving paints of this type are used in industry and in powder coatings. 

Architectural paints are applied in situ with brushes or rollers in Europe, but spray application is widely used in the USA on concrete and wooden buildings. Paints on windows and doors are brush applied. Structural components (e.g., doors, windows, radiators) that receive primers or complete coating systems during production or in the workshop are dipped or sprayed. 

Uses Surf, conditioner for paints/coatings. solv.-fteie systems incl. UV. EB, two-component catalyzed and powd. coatings, appliance/metal furniture topcoats food pkg. adhesives/coatings/paper. in waterborne or solvent-borne coatings defoamer in food-contact coatings Regulatory FDA21CER 175.105.175.300.175.320.176.170.176.180. 176.200... 

Uses Defoamer, antifoam for solv.-based and solv.-free systems, one-and two-component PU paints/coatings Features Silicone-free... 

The anode system may be a single component, such as flame sprayed zinc, or multiple components such as a titanium mesh with a ceinentitiou.s overlay or conductive paint coatings with a protective/ cosmetic top coat, All anodes require electrical connections to the power supply. The anode and rebar connections should be duplicated for redundancy. 

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