Insulating resins protective coatings

Uses Preparation of polystyrene, styrene oxide, ethylbenzene, ethylcyclohexane, benzoic acid, synthetic rubber, resins, protective coatings, and insulators. 

Phenolic resins also find use in varnishes, electrical insulation, and in other protective coatings. Heat-settings adhesives which are based on phenolics find use in producing plywood. These also find use in the production of ionexchange resins having amine, sulphonic acid, hydroxy or phosphoric acid functional groups. 

Teflon Fluorocarbon Resin, for instance was discovered in 1938. The substance was produced on a small scale throughout World War II for defense applications. It became commercially available in 1948, but did not gain public recognition until 1961 when it was used as a lining for nonstick frying pans. Today, Teflon coats chemical process equipment, insulates electrical equipment, coats the blades of tools, protects buildings from earthquakes and is used as a material in... 

Chem. Deserp. Partially polymerized (dimerized) rosin CAS 8050-09-7 EINECS/ELINCS 232-475-7 Uses Prep, of varnishes, driers, syn. resins, ink vehicles, floor tile, rubber compds., solder fluxes, elec, insulation oils, optical lens pilches, adhesives and protective coatings for food pkg./processing Features Noncrystallizing, high soften, pi., acidic resin Properties Gardner 8 (60% solids in min. spirits) solid, flakes sol. in aliphatic, aromatic, and chlorinated hydrocarbons, in ketones, esters, natural oils, terpenes, and varnish oils dens. 1.07 kg/l G-H vise. C (60% solids in min. spirits) Hercules drop soften, pt. 102 C flash pt. (COC) 218 C acid no. 144 sapon. no. 160 Polyplate 90 [Huber Engineered Materials]... 

Silicones appear in various compositions from thin fluids up to polymers that act as elastomers or thermosetting rigid plastomers. Silicones excel in weather durability, water repellency and in electrical and thermal properties. Silicone resins or coatings have heat-distortion temperatures up to 450 C. They are much used in aviation and the space industry as electrical insulation for motors, glue, protective coatings, a premium elastomer or as additives in construction. 

Corrosion protection by ICPs has been well documented in several reviews [136-141]. The use of ICP-based core-shell latexes for the corrosion protection of steel is a relatively new field of research, and a recent review has proposed the exploitation of such possibihties [142]. In a recent study, we found that ICP-based core-shell latexes offer the possibility of achieving anticorrosion properties [143], though the presence of pinholes or scratches in the coatings enhances the corrosion rate of metals. This problem may be due to poor dispersion of the composite particles in the insulating resin systems, and future research will need to develop conductive polymer-based anticorrosive primers for metals. The anticorrosive properties of PANI-coated polystyrene latex microspheres has been reported recently [144]. PS-PANI composite particles with core-shell structure were prepared by chemical oxidative polymerization of anihne monomer in the presence of a PVP-stabilized PS latex suspension. The reduced form of the particle was obtained by adding hydrazine mono hydrate to the suspension. Both oxidized and reduced PANI-PS particles were used to obtain a PANI-PS-coated iron electrode (PANl-PS-Fe). Pure PANI... 

General Electric Company, Resinous Insulating Composition, Br. Pat. 1,003,975 (1965). Polyester-styrene/epoxy-chlorinated anhydride SIN. Solid dielectric and protective coating for electrical apparatus. 

Epoxy resins are widely used as protective coatings and adhesives, for structural applications such as adhesives to bulk out structural components, with extensive use in the aerospace, dental and other medical fields. Moreover, epoxies are widely used as insulating and structural materials in manufacturing microelectronic devices and components such as computer chip packing and circuit boards, due to their excellent combination of chemical and corrosion resistance and good electrical properties. On the other hand, unsaturated polyester (UPE) resin, a resin prepared from a polyester synthesized by esterification of glycol, unsaturated acid and saturated acid dissolved in styrene monomers, is widely used in many applications, such as electronic equipment, containers, automobiles, and cultured marble because of its clarity, and excellent chemical and corrosion resistance. 

The resins have wide appHcation. In nonreinforced form they serve as insulating coatings for electrical coils (46—47). As fiber reinforced resins, they can be made by reaction injection mol ding into laminates, castings, and coatings (48—49). Fiber-reinforced resins are used in marine appHcations (recreational boats) automotive parts (50) bathroom countertops and shower stalls and tubs and more recendy as baUistic protection for military vehicles and aircraft. 

To prevent underground corrosion, lead is frequently protected with coatings of tar, bitumen, resin, etc., which are only effective if they completely insulate the metal from corrosive agents and stray currents. No coating is fully effective, but some give good protection ". The most successful method used is cathodic protection which for impressed currents, if correctly applied, can protect indefinitely (see Chapter 10). It is effective at a potential of E° = —0-8 V or about 0-1 V more negative than... 

Recent experience has confirmed that, by adopting the recommendations of the British Standards Institution or similar codes of practice operating in other countries, the likelihood of corrosion damage to buried structures adjacent to cathodically protected installations is negligible. This is because recently installed cathodically protected structures are usually coated with eflicient and durable insulating coverings such as epoxy resins and the protective current applied is consequently small. In many cases the small protective currents that can be applied by means of galvanic anodes is adequate. 

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