# US 11,298,721 B2 · Pre-treating polymer tubing or hose with a hydrophobic coating to reduce depletion of corrosion inhibitor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,298,721 B2 - Document ID: US11298721B2 - Status: Granted - Kind: B2 - Application number: 16/382,460 - Filed: 2019-04-12 - Published: 2019-08-01 - Granted: 2022-04-12 - Earliest claimed: 2015-09-18 - Assignees: International Business Machines Corporation - Applicants: International Business Machines Corporation - Inventors: Daniel J. Buvid; Eric J. Campbell; Tyler Jandt; Joseph Kuczynski - Web page: https://patentgrep.com/patent/US11298721B2 ## CPC - B05D 7/22: to internal surfaces, e.g. of tubes - B05D 5/08: to obtain an anti-friction or anti-adhesive surface (rendering particulate materials free-flowing in general, e.g. making them hydrophobic B01J2/30) - C09D 5/086: {Organic or non-macromolecular compounds} - C09D 183/04: Polysiloxanes - H05K 7/20254: {Cold plates transferring heat from heat source to coolant} - H05K 7/20272: {Accessories for moving fluid, for expanding fluid, for connecting fluid conduits, for distributing fluid, for removing gas or for preventing leakage, e.g. pumps, tanks or manifolds} - H05K 7/20772: {within server blades for removing heat from heat source} - H10W 40/47: by flowing liquids, e.g. forced water cooling - B05D 5/083: {involving the use of fluoropolymers} - B05D 7/222: {of pipes} - C08G 77/16: to hydroxy groups - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS ## Abstract An inside surface of a hose for use with liquid-cooled cooling plate assemblies and other applications that contain copper (Cu) components is pre-treated with a hydrophobic coating to reduce depletion of a copper corrosion inhibitor (e.g., benzotriazole (BTA)) dissolved in a liquid coolant (e.g., deionized water) that flows through the hose. Exemplary hydrophobic coatings include, but are not limited to, polydialkylsiloxanes such as polydimethylsiloxanes. In one embodiment, a multilayer hose is immersed in a solution containing hydrophobizing siloxane monomers dissolved in a solvent. The coated multilayer hose is then dried to evaporate the solvent. As the solvent evaporates, the siloxane monomers bind together to form the hydrophobic coating. In some embodiments, one or more hoses each provided with a hydrophobic coating interconnect liquid-coolant cooling system components (e.g., cold plates, headers, manifolds, pumps, reservoirs, and heat exchangers) of a cooling apparatus that removes heat from one or more electronic components. ## Claims ### Claim 1 A hydrophobic material coated hose for interconnecting components of a liquid-coolant cooling system having a corrosion inhibitor dissolved in a liquid coolant, comprising: a hose, wherein the hose is pre-treated with a hydrophobic coating to reduce depletion of the corrosion inhibitor dissolved in the liquid coolant, wherein the hydrophobic coating has a coating thickness of 1-5 mils; and wherein the hose comprises polymer tubing containing oxide surfaces, and wherein the hydrophobic coating is formed by binding together hydrophobizing siloxane monomers or fluoropolymers and by binding the hydrophobizing siloxane monomers or the fluoropolymers to the oxide surfaces contained in the polymer tubing. ### Claim 2 (depends on 1) The hydrophobic material coated hose as recited in claim 1, wherein the hydrophobic coating includes a polydialkylsiloxane. ### Claim 3 (depends on 2) The hydrophobic material coated hose as recited in claim 2, wherein the polydialkylsiloxane is a polydimethylsiloxane. ### Claim 4 (depends on 1) The hydrophobic material coated hose as recited in claim 1, wherein the hydrophobic coating includes a fluoropolymer. ### Claim 5 (depends on 1) The hydrophobic material coated hose as recited in claim 1, wherein the corrosion inhibitor includes benzotriazole (BTA), wherein the hose is a multilayer hose comprising an inner layer and outer layer each comprised of ethylene propylene diene monomer (M-class) (EPDM) rubber, wherein a reinforcement layer is interposed between the inner layer and the outer layer, and wherein the reinforcement layer comprises textile filaments braided, knitted or spirally wound on the inner layer. ### Claim 6 (depends on 1) The hydrophobic material coated hose as recited in claim 1, wherein the hose comprises polymer tubing containing oxide surfaces, and wherein the hydrophobic coating is formed by binding together hydrophobizing siloxane monomers and by binding the hydrophobizing siloxane monomers to the oxide surfaces contained in the polymer tubing. ### Claim 7 (depends on 6) The hydrophobic material coated hose as recited in claim 6, wherein the hydrophobizing siloxane monomers include a polydialkylsiloxane. ### Claim 8 (depends on 7) The hydrophobic material coated hose as recited in claim 7, wherein the polydialkylsiloxane is a hydroxyl-terminated polydimethylsiloxane (PDMS), and wherein the terminal hydroxyl groups of the hydroxyl-terminated PDMS are available to participate in a condensation reaction with each other to form the hydrophobic coating. ### Claim 9 (depends on 1) The hydrophobic material coated hose as recited in claim 1, wherein the hose comprises polymer tubing containing oxide surfaces, and wherein the hydrophobic coating is formed by binding together fluoropolymers and by binding the fluoropolymers to the oxide surfaces contained in the polymer tubing.