Method for producing composite material for coating applications
AssigneeZulzer Metco (Canada) Inc.
InventorsKarel Hajmrle, William Walkhouse
Life of this patent
Estimating the term…
Abstract
The production of solid lubricant agglomerates by combining solid lubricant powder, an inorganic binder, other fillers if optionally desired, and a liquid to form a mixture, and driving off the liquid to form dry agglomerates which are subsequently classified by size or milled and classified by size to yield agglomerates of a desired size range. These agglomerates are then treated to stabilize the binder, thereby strengthening the binder and rendering it nondispersible in the liquid. The undesired size ranges can be readily recycled because the agglomerates with untreated binder can be reprocessed, thereby promoting high recovery rates.
Claims24
A method for producing solid lubricant agglomerates comprising:
- admixing a particulate solid lubricant, an inorganic water dispersible binder, and water to produce a mixture having about 5 to 60 weight % solids based on the total weight of the mixture, wherein the ratio of the weight of the solid lubricant being admixed to the weight of the inorganic water dispersible binder being admixed is from about 19:1 to about 1:19 and wherein the inorganic water dispersible binder is a hydrous aluminum silicate that is stabilized at a temperature above about 850° C.;
- particulating the mixture and drying the particulated mixture to produce dry agglomerates at a temperature below the stabilizing temperature at which the inorganic water dispersible binder is rendered non-dispersible in the water;
- classifying the dry agglomerates by size, or milling and classifying the dry agglomerates by size, into an undersize particle fraction;
- a desired particle size fraction and an oversize particle fraction;
- recycling and admixing the undersize particle fraction with the particulate solid lubricant, the inorganic water dispersible binder and the water in the mixture, recycling and admixing the oversize particle fraction with the particulate solid lubricant, the inorganic water dispersible binder and the water in the mixture, for redispersion of the undersize and the oversize particle fractions in the water to form the mixture,
- and heating the desired particle size fraction to the temperature effective to render the inorganic water dispersible binder in the dry agglomerate of the desired particle size fraction non-dispersible in the water.
A method for producing solid lubricant agglomerates comprising:
- admixing a particulate solid lubricant selected from the group consisting of hexagonal boron nitride, graphite, calcium fluoride, magnesium fluoride, barium fluoride, tungsten disulphide and molybdenum disulphide particles, at least one inorganic water dispersible binder selected from the group consisting of bentonite, fuller's earth and montmorillonite, and water to produce a mixture having about 5 to 60 weight % solids based on the total weight of the mixture, wherein the ratio of the weight of the solid lubricant being admixed to the weight of the binder being admixed is from about 19:1 to about 1:19;
- particulating the mixture and drying the mixture to produce dry agglomerates at a temperature below a stabilizing temperature at which the inorganic water dispersible binder is rendered non-dispersible in the water;
- classifying the dry agglomerates by size, or milling and classifying the dry agglomerates by size, into an undersize particle fraction, a desired particle size fraction and an oversize particle fraction;
- recycling and admixing the undersize particle fraction with the particulate solid lubricant, the inorganic water dispersible binder and the liquid in the mixture, recycling and admixing the oversize particle fraction with the particulate solid lubricant, the inorganic water dispersible binder and the water in the mixture, for redispersion of the undersize and the oversize particle fractions in the water to form the mixture,
- and heating the desired particle size fraction to a temperature effective to render the inorganic water dispersible binder in the dry agglomerate of the desired particle size fraction non-dispersible in the water.
Dependencies are inferred from the claim text.