Cobalt Accelerators

The curing of UPR initiated with MEK peroxide and Co octoate as the promoter was studied by DSC [168]. The kinetic analysis of an asymmetrical DSC peak was performed. It was assumed that the asymmetrical shape of the DSC curves resulted from two independent reactions. When two independent reactions were considered, the fit of the experimental data was better. 

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The resins are commonly cured by the use of peroxide with or without cobalt accelerators, depending on whether the hardening is to be carried out at room temperature or at some elevated temperature. Electron irradiation curing, which can be completed within a few seconds, has, however, been introduced for coatings on large flat surfaces such as plywood, chipboard and metal panels. 

Reduced cobalt accelerates the reduction of acetylene to ethane by hydrogen above 180° an. <3. some liquid paraffins result at the same time. Evidently these three metals bring about different resnlts under similar conditions. 

During electron transfer reactions, the coordination spheres of the metal ions remain intact. By contrast, ligand transfer reactions proceed via a bridged activated complex in which the two metal ions are connected by a common bridging ligand. In the examples above, replacement by chloride of only one of the six ammonia ligands bound to cobalt accelerates the rate by a factor of over 109. 

Furthermore, the purity of tungsten has an influence on le carburization. Certain impurities, such as cobalt, accelerate the carburization, and others, like the alkali metals, retard it [3.73]. 

Tert butyl catechol techn. pure powder 10% solution in styrene (SETA flash point 31) Prolongs (up to many hours) pot life - gel time of resin + (ketone) peroxide + (cobalt) accelerator- at ambient temperature mold release factor improved also efficient at elevated temperatures a c d e f g h i... 

For example, dimethylaniUne has no accelerating effect on methylethylketone peroxide, but it can have a significant influence on the system MEK peroxide/cobalt accelerator, whose effect is frequently made use of for processing purposes. 

Uses Dispersant for fillers in unsat. polyesters, in mfg. of syn. marbles, gel coats, pigments, pastes, polyester mastics Features Rec. in cold cure systems which use cobalt accelerators Properties Yel. liq. sol. in water, aromatic solv. sp.gr. 1.18 00.02 vise. 

Trimethylolpropane triacrylate Urea-formaldehyde resin, methylated crosslinking agent, cobalt accelerators Acetylacetone peroxide crosslinking agent, concrete polymers PEG dimethacrylate crosslinking agent, concrete sealants PEG dimethacrylate... 

Cobalt accelerators cobalt siccatolate, naphthenate or octoate... 

Methyl isobutyl ketone peroxide liquid normal activity Versatile type for curing above 55°C poss. with more thermally stable peroxides and/or cobalt accelerators suitable for all resin types ef... 

Cumene hydroperoxide 80% liquid Special type for curing above SO C with cobalt accelerators f... 

Cure promoters include metal compounds, for optimal cure hot press moulding acetylacetone, with ketone peroxides and cobalt accelerator for a short geltime, giving a fast cure at room temperature and at elevated temperature and tertiary dodecyl mercaptane, for a gradual cure and moderate peak exotherm, in filament winding. 

A cobalt accelerated, UV stabilised topcoat offering good resistance to chemicals, which hardens to a tack free and mat surface. 

A cobalt accelerated, UV stabilised gelcoat with an extremely high elongation at break, high impact and scratch resistance. Available clear and white, as well as in a select range of RAL colours. 

Formerly 580-05 ACT 20 580-05 BH) An amine and cobalt accelerated, and thixotropic variant of 580. 

A cobalt accelerated, orthophthalic, filled paste for bonding, repair and filling. 

Water itself can also be a cause of under-curing when UP or VE resins are cured using cobalt accelerators here, the influence from aerial oxygen is sufficient. Cold stored resin should therefore be brought up to ambient temperature before the... 

The presence of light or transition metal oxides of copper, nickel, or cobalt accelerates the exothermic decomposition into hydrochloric acid and oxygen ... 

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