Epoxy resins, coatings

Glass pipe can be furnished with an epoxy-resin coating reinforced with woven glass fiber to protect it from abuse. Equipped with special ball couphngs, this may be used for 1-MPa (150-lbf/in ) pressure. 

Figure 5.16 Delaminated, phenolic epoxy resin coating on an internal surface. (Magnification 7.5x.)...

In planning cathodic protection, the specific resistivity of the water, the size of the surfaces to be protected and the required protection current densities have to be determined. The protection current density depends on the type and quality of the coating. Thermosetting resins (e.g., tar-epoxy resin coatings) are particularly effective and are mostly used today on coastal structures. They are chemically... 

A tank with a fixed cover of plain carbon steel for storing 60°C warm, softened boiler feed water that had a tar-pitch epoxy resin coating showed pits up to 2.5 mm deep after 10 years of service without cathodic protection. Two separate protection systems were built into the tank because the water level varied as a result of service conditions. A ring anode attached to plastic supports was installed near the bottom of the tank and was connected to a potential-controlled protection rectifier. The side walls were protected by three vertical anodes with fixed adjustable protection current equipment. 

Epoxy resin paints, inferior to chlorinated rubber for resistance to strong acids, are excellent for dilute acids and strong alkalis. They produce a harder, more abrasion-resistant coating than does chlorinated rubber and are much better for resistance to fats, oils and many organic solvents. Table 3.50 gives data on the chemical resistance of epoxy resin coatings to different materials. 

Tabic 3.50. Chemical Resistance of Epoxy Resin Coatings [54]... 

More modest surface-to-bed heat transfer coefficients have been reported for a DDM fluidized bed, albeit during heating of the bed, using large epoxy resin-coated particles, either 8 mm or 12 mm in... 

Harrison et al. (1985, 1987) reported on two construction workers who were exposed to 2-nitropropane while applying epoxy resin coating. One man died 10 days after exposure from fulminant hepatitis, the other man had persistently elevated serum aminotransferase activity. Serum concentrations of 2-nitropropane on admission were 13 mg/L in the man who died and 8.5 mg/L in his co-worker. 

A computer operator developed RADS following exposure to chemicals contained in an epoxy resin coating that was applied to a concrete floor in his presence. The computer operator s coworker, however, did not develop RADS but developed a chronic cough. The coating product contained the following chemicals ... 

Use Perfumes, high-boiling solvent, especially for epoxy resin coatings, leather finishes, flavoring, odorant, antiblushing agent for nitrocellulose lacquers. 

Even with only a few mils of an FR4 or epoxy resin coating, the conductivity of a 62 mil (1.5 mm) thick sheet of copper drops to 5-8 from the 390 for the metal itself. The conductivity of steel (55) is reduced to a value of 12-18 when coated with porcelain. 

Technique for Reformulating Solvent Mixtures in Epoxy Resin Coatings... 

Somerville and lopez Reformulating Epoxy Resin Coatings 177... 

Formulation of solvent combinations for epoxy resin coatings is based on blends of solvents as composites with (8) and (p) within the solubility area shown in Figure 1. Evaporation rate, flash point, air pollution restrictions (if appropriate), and cost are among the other considerations in solvent selection. 

Air applications use preferred plastic covers or just epoxy resin coatings. 

Table 2.21 Chemical resistance of epoxy resin coatings...

Many studies have appeared dealing with the properties of crosslinked polymer systems. These include adhesion of epoxy-acrylates onto tin-plate, adhesion of isocyanate and epoxy-resin coatings, adhesion of butadiene-acrylate rubbers onto metals, glass, and ceramics, adhesion of acrylic, thiol, and polyester resins to aluminium bodies, and the mechanical and physical properties of photo-crosslinkable poly(vinyl cinnamate), vinyl-divinyl copolymers,polythiols, acrylates, epoxies, and thiols,epoxy resins, polyesters on wood, ... 

Elastomer-Modified Epoxy Resins - Coatings Background... 

Pigmented, two-pack, waterborne epoxy resin coatings (garages) or one-pack waterborne acrylic resin emulsion paints are used for areas that receive less wear (e.g., cellars). Wooden parquet floors are coated with one- or two-pack polyurethane varnishes that can be applied by spraying or brushing. Acrylate-based waterborne parquet varnishes are also used because they are environmentally friendly. 

---