Polymer-coated member having a reticulated foam substrate with an open-cell foam structure and at least one polymeric coated surface
A substrate for use in an aqueous slurry has a polymeric coating to provide a compliant and sticky surface. The polymer coating has a chemical to render the surface hydrophobic so as to attract hydrophobic or hydrophobized mineral particles in the slurry. The substrate can take the form of a conveyor belt, a bead, a mesh, an impeller, a filter or a flat surface. The substrate can also be an open-cell foam. The polymeric coating can be modified with tackifiers; plasticizers; crosslinking agents; chain transfer agents; chain extenders; adhesion promoters; aryl or alky copolymers; fluorinated copolymers and/or additives; hydrophobizing agents such as hexamethyldisilazane; inorganic particles such as silica, hydrophobic silica, and/or fumed hydrophobic silica; MQ resin; and/or other additives to control and modify the properties of the polymer.
1. A polymer-coated member configured to contact an aqueous slurry containing hydrophobic and hydrophobized particles, the polymer-coated member comprising:
a substrate comprising a reticulated foam having open-cell foam structure, the substrate having two surfaces, the reticulated foam having a foam thickness; and
a polymeric coating disposed on one or both of the two surfaces, the polymeric coating made from a coating material comprising a polymer to render the polymeric coating compliant and tacky, wherein the substrate is arranged to move through a pair of rollers arranged adjacent to each other substantially in a horizontal direction, the rollers separated from each other by a gap having an upper portion and a lower portion, wherein the coating material is arranged to provide onto the substrate above the gap and the gap is dimensioned to compress the reticulated foam so as to impregnate the open-cell foam structure with the coating material when the substrate is moved from the upper portion of the gap through the lower portion of the gap to achieve the polymeric coating, wherein the coating material is selected from the group consisting of nitriles, styrene block copolymers with ethylene, styrene block copolymers with propylene, styrene block copolymers with isoprene and polyvinyl ether, and wherein the coating material is modified with a modifying material selected from the group consisting of tackifiers; plasticizers; crosslinking agents; adhesion promoters; aryl or alky copolymers; fluorinated copolymers, hexamethyldisilazane; silica and hydrophobic silica.
2. The polymer-coated member according to claim 1 , wherein the polymer coating comprises a chemical having a functional group rendering said one or two surfaces hydrophobic so as to attract the particles.
3. The polymer-coated member according to claim 1 , wherein the polymeric coating is further modified with a chemical selected from the group consisting of alkyl, aryl, fluorinated functionalities; silica-based additives and other inorganics, including clays, bentonite, or both clays and bentonite; low molecular weight and oligomeric plasticizers and POSS materials.
4. The polymer-coated member according to claim 1 , wherein the two surfaces are configured to contact both the first roller and the second roller simultaneously through the gap.
5. The polymer-coated member according to claim 4 , wherein the two surfaces pick up the coating material while the substrate is moved through the upper portion of the gap toward the lower portion of the gap.
6. The polymer-coated member according to claim 4 , wherein the coating material comprises a sprayed coating material that is sprayed onto the two surfaces of the substrate above the gap.
7. The polymer-coated member according to claim 4 , wherein the coating material comprises an extruded coating material that is extruded onto one or both surfaces of the substrate above the gap.
8. The polymer-coated member according to claim 1 , wherein the reticulated foam comprises a plurality of pores having a pore size ranging from 5 PPI to 120 PPI.
9. The polymer-coated member according to claim 1 , wherein the reticulated foam has a foam thickness ranged from 1/32″ to 6″.