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Crosslinking epoxy coatings

For this use, the preferred powders are based on acrylic, epoxy or polyester and epoxy resins. For best colour, epoxy resins are crosslinked with anhydrides of dicarboxylic acids in the straight epoxy coatings, or with saturated polyesters of high acid content in the epoxy-polyester type. Acrylics contain epoxide rings via, for example, glycidyl methacrylate (CH2=C(CH3) —CO—O—CHj—CH —CH2), and these groups crosslink... [Pg.632]

Both anionic and cationic initiation are used to cure (polymerize and crosslink) epoxy resins (Sec. 2-12d) by ROP of the oxirane end groups. Photochemical cationic initiation (Sec. 5-2a-4) is important in various coating applications (3-4c) [Decker et al., 2001]. [Pg.569]

Thus, in alkyd, polyester, and epoxy coatings applied to CRS, phosphatized steel, and aluminum, the use of ZAs APG (aminofunctional) and CPG (carboxy-functional) has allowed for the virtual elimination of blister formation and corrosion after 300 h of salt fog exposure. The use of multifunctional ZAs in a Kraton base adhesive has allowed for a 52% increase in T-peel strength on EPDM rubber when compared with the same adhesive containing aminofunctional silane. Incorporation of mercaptofunctional ZA into crosslinkable elastomers has... [Pg.567]

Formulations of epoxy coatings can be varied over a wide range by combining different epoxy resins and cationic photoinitiators discussed in this paper. The reactivity of a formulation depends upon the structure of the epoxies and the photoinitiators which can be further influenced by additives such as fillers, pigm its, colorants, stabilizers etc. Complete crosslinking of epoxide/initiator systems can be achieved by an irradiation and a heat treatment step, both of a very short duration... [Pg.78]

Beckopra EH 651/70X crosslinking agent, low-gloss epoxy coatings... [Pg.1484]

Epoxy coatings, crosslinked with amines or polyamines, are widely used in atmospheric fume environments. Because of the sensitivity of coal tar pitch to UV light, coal tar epoxies are not normally used in atmospheric exposures. [Pg.99]

The 4532 cm combination tone is reasonably free of interferences, and can be employed to measure oxirane ring concentrations for epoxy-coating resin systems during synthesis and crosslinking. With the use of low S/N FTIR supported by computer data manipulation, chloroform solutions of five commercially available resins were analysed for epoxide-equivalent weight and correlated with results obtained by perchloric acid titrations. The near-IR technique displays linearity for epoxy concentrations of 3.6-20.7 meq/1. Similar results were obtained via a serial concentration study, indicating that the technique is not strongly affected by matrix effects. [Pg.301]

Epoxy resin crosslinker Epoxy resin crosslinker Light-sensitive photographic film barrier layer Multilayer photographic films modifier Hydroxyl alkyl esters for thermosetting metal coatings... [Pg.553]

Epoxy crosslinker for coat- United States 3,422,076 1969 American Cyanamid... [Pg.648]

Keywords Interlayer adhesion loss Epoxy coatings Weathering Erosion mechanism UV absorber Humidity Water Crosslinking Network degradation Oxygen diffusion and solubility Photoproducts Oxidation zone Rain Lag time UV radiation degradation... [Pg.185]

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See also in sourсe #XX -- [ Pg.519 , Pg.520 , Pg.521 , Pg.522 ]



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