Graphite-containing compositions
OwnerRonald R. Savininventor
Life of this patent
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Abstract
Disclosed herein is a precursor powder composition comprising a resin, a combination of zinc dust, zinc powder and zinc-coated microspheres and graphite, said powder being soluble in a solvent blend at a facility remote from the powder manufacturing facility, thereby, decoupling the powder manufacturing process from the end use of the powder which could be in a traditional solvent-based paint. Also disclosed are coating compositions for use in protecting metallic substrates from corrosion, comprising necessary additives and film forming substances including alkyl silicate, epoxy resins, powder and non-powder, and polyester resins, all the compositions being modified with about 4 to about 20 weight percent graphite powder based on total weight of the composition.
Claims36
A powder coating composition comprising zinc in the form of zinc powder and/or zinc dust, a resin binder selected from the group consisting of epoxy resins, polyester resins and mixtures thereof, graphite powder, wherein the weight percentage of zinc as part of the combined amount of zinc and binder is from about 75 to about 90%, and graphite is present at a level of about 20-60 weight % of the binder.
In a process for the manufacture of a solvent based coating composition, an improvement process for decoupling the use of the solvents from the formation of the remainder of the coating, comprising the steps of:
- dry blending a mixture of zinc in the form of zinc powder and/or zinc dust, a resin binder selected from the group consisting of epoxy resins, polyester resins and mixtures thereof and graphite powder, wherein the weight percentage of zinc as part of the combined amount of zinc and binder is from about 75 to about 90%, and graphite is present at a level of about 20-60 weight % of the binder;
- grinding and screening said particles so that the particle size of a substantial majority of said mixture is less than 40 microns;
- and
- dissolving said screened mixture in a suitable solvent at a location remote from site of said above two steps.
A solvent-based coating composition comprising a resin binder, selected from the group consisting of epoxy resins, epoxy ester resins, polyester resins and mixtures thereof, the composition comprising:
- from about 50% to 80% of a zinc containing substance selected from the group consisting of zinc powder, zinc dust, zinc-coated microspheres and mixtures thereof;
- from about 4 to 20% of graphite;
- and
- at least about 10% solvent.
Dependencies are inferred from the claim text.