Epoxy-alkyds

For many moderate-duty films for operating temperatures below 80 to 120°C, M0S2 is used in combination with acryflcs, alkyds, vinyls, and acetate room temperature curing resins. For improved wear life and temperatures up to 150—300°C, baked coatings are commonly used with thermosetting resins, eg, phenohcs, epoxies, alkyds, siUcones, polyimides, and urethanes. Of these, the MlL-L-8937 phenoHc type is being appHed most extensively. 

Inhibitive Primers. The traditional primers are red lead and linseed oil, alkyd resins and zinc potassium chromate, proprietary epoxy, alkyd, urethane and latex systems with modified phosphate, borate and molybdate pigments. Chromate-based pigments, although in use in aircraft coatings, automotive primers and coil coating primers, are subject to environmental concern on the toxicity of hexavalent chromium which is likely to result in their replacement by innocuous products. 

Resins/Crosslinking Agent Epoxy/Alkyd Solids, %... 

Epoxy alkyds typically have 5—45% resins based on epoxy chemistry. Bisphenol A along with other phenols is used with epichlorohydrin. The epoxy groups of the resin are esterified with unsaturated fatty acids of soybean and tall oils. These resins oflFer better performance than a simple alkyd with excellent chemical-resistance and strong adherence to a wide variety of materials. 

Many plastics have short lives when exposed to outdoor conditions. RPs, particularly glass fiber RPs) can be destroyed if not properly fabricated to eliminate seepage of water between fibers and resin. The better materials to weatherability include acrylic, chlorotrifluorethylene, vinylidene fluoride, chlorinated polyether, black linear polyethylene, TS polyester, epoxy, alkyd, and phenolic (Table 9.19). Some of these plastics have successfully performed outdoors for over a half-century. Black materials are best for outdoor service. Some of the styrene copolymers are suitable for certain outdoor uses. 

Chem. Descrip. Blend of mineral oils and proprielary hydrophobes Uses Defoamer for wafer-based sfems, indusfrlal coatings (epoxy, alkyds, acrylics, polyesfer, PU)... 

Uses Emulsifier, flow aid, anticratering agent for polymer emulsions, waterborne industrial coatings (epoxy, alkyds, polyesters), emulsion printing inks, aq. adhesives, polymerization, cleaners, wallpaper removers Features Silicone-free... 

Uses Surfactant, slip agent, mar resist, aid for coatings, two-component urethanes, polyester-melamine, epoxies, alkyd/melamine, selfcrosslinking acrylics, etc. 

These may contain the epoxy resins, epoxy-esters, epoxy-alkyds or other possible epoxidized resins. Both stoving and air-drying variants are possible. 

Chlorendic anhydride (1,4,5,6,7,7-hexa-chloro-5-norbornene-2,3-dicar-boxylic anhydride, HET anhydride, a difunctional acid anhydride) n. HET anhydride is a white, crystalline powder used as a hardening agent and flame retardant in epoxy, alkyd, and polyester resins (See image). 

Vinyls Acrylics Epoxy Alkyds Urethanes Glass Chromate Molybdate Electroplating Diffusion... 

Cross-linked polymers can be produced by both chain addition polymerization and step polymerization mechanisms. In the case of step polymerizations, thermosetting epoxy, alkyd, phenol/formaldehyde, and other cross-linked materials can be produced by increasing the average number of functional... 

It should be noted that in preparing epoxy alkyd resins the functionality of a typical epoxy resin (Epon 1001) is 6, due to 2 OH groups and 2 epoxy groups (4 functional sites). A typical recipe is as follows [65]. 

Most of the important types of modem solvent-borne coatings — epoxies, alkyds, acrylics — are also available in waterborne formulations. In recent years, even urethane polymer technology has been adapted for use in waterborne coatings [1]. However, waterborne paints are not simply solvent-borne paints in which the organic solvent has been replaced with water the paint chemist must design an entirely new system from the ground up. In this chapter, we discuss how waterborne paints differ from their solvent-bome counterparts. 

Alkyd and aminoplast Alkyd and aminoplast + epoxy Alkyd and silicone Similar uses as above, but where a high premium is placed on color retention, and superior chemical and heat resistance... 

Thermosets are plastics that form large molecules by an irreversible chemical cross linking reaction. Figure 9.3 illustrates the formation of a thermoset. In this case, phenol is reacted with formaldehyde to produce the thermoset called bakelite, with water as a by-product. This was the first synthetic plastic developed. It was invented by L. H. Bakeland in 1906. Thermosets cannot be melted and cannot be recycled. Other thermosets are epoxies, alkyds, polyesters, aminos, polyimides, and silicones. 

Bonded abrasives Phenolics Epoxy Alkyd Natural rubber SBR Shellac Polyimide Grinding wheel... 

External Polyesters, acrylics, alkyds.epoxies, aminos Epoxies, alkyds Organosols, epoxies, phenolics Polyesters, acrylics, efMxies. aminos, vinyl Acrylics, polyester, vinyl, aminos... 

These thermoplastic resins are obtained by the polymerization or copolymerization of acrylic and methacrylic esters. Acrylic resins may be combined with melamine, epoxy, alkyd, acrylamide, etc., to produce systems that bake to a film with excellent resistance to water, acids, alkalies, chemicals, and other corrosives. Acrylic resins are used in coatings for all types of appliances, cans, and automotive parts and for all types of metals. 

Uses Wetting agent, dispersant, antistat, defoamer, gellant, solubilizer, lubricant base for cosmetic, medical, paper, pharmaceutical and textile industries coalescing solvent for plasticizing acrylic emulsion polymers, latex caulks, epoxies, alkyds, polyesters, phenolics increases flexibility and toughness, improves film formation... 

Uses Wetting agent, dispersant, film-former for aq. acrylic, alkyd, styrene acrylic, epoxy, alkyd-melamine, or polyurethane coatings and inks maximizes color development stabilizes the dispersion against flocculation and settling Properties Cl. vise, liq. sp.gr. 1.01 Use Level 1-2%... 

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