Corrosion resistant coating and liner combination

• US 4,792,493 A
• Filed: 10/07/1986
• Issued: 12/20/1988
• Est. Priority Date: 10/07/1986
• Status: Expired due to Fees

• Current Assignee: Richard L. Bertram
• Original Assignee: Richard L. Bertram, Vernie L. Belcher
• Inventors: Belcher, Vernie L., Bertram, Richard L.
• Primary Examiner(s): Buffalow, Edith
• Application Number:
  US06/916,172
• Time in Patent Office: 805 Days
• Field of Search: 428/424.8, 428/911
• US Class Current: 428/424.8
• CPC Class Codes: B05D 7/26 synthetic lacquers or varnishes B05D7/08, B05D7/16 take precedence
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 41/009 characterised by the material treated
• CPC Class Codes: C04B 41/463 Organic solvents
• CPC Class Codes: C04B 41/4838 Halogenated polymers
• CPC Class Codes: C04B 41/4861 Polyalkenes
• CPC Class Codes: C04B 41/4884 Polyurethanes; Polyisocyanates
• CPC Class Codes: C04B 41/52 Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
• CPC Class Codes: C04B 41/522 Multiple coatings, for one of the coatings of which at least one alternative is described
• CPC Class Codes: C04B 41/70 for obtaining at least two superposed coatings having different compositions
• CPC Class Codes: E03F 3/04 Pipes or fittings specially adapted to sewers manufacture of concrete tubes B28; pipes or pipe fittings in general F16L
• CPC Class Codes: F16L 58/1018 the protective layer being fixed by means of anchoring devices
• CPC Class Codes: Y10S 428/911 Penetration resistant layer
• CPC Class Codes: Y10T 428/31587 Hydrocarbon polymer [polyethylene, polybutadiene, etc.]

Abstract

A layer of polyethylene or polyvinal chloride bonded to a layer of polyurethane material in turn bonded to a surface of material such as concrete or metal comprises a combination of a coating and a liner which prevents corrosion of the coated, lined material and is substantially free of pin hole penetrations. A method of spray applying atomized polyurethane material to a surface to be coated, such as concrete or metal, and thereover applying a layer of polyethylene or polyvinal chloride material is described. A machine for spray applying polyurethane material from a nozzle atomizes the polyurethane material at elevated pressures and temperatures.

Claims

1. A coating for material susceptible to corrosive deteriorization by contact with elements, comprising:

a. a layer of polyurethane material bonded to an exposed surface of said material susceptible to corrosive deteriorization; and

b. a polyethylene layer bonded to said layer of polyurethane and substantially separate from said material.

2. The coating of claim 1 wherein said polyurethane material includes at least polyurethane and an aromatic solvent.

3. The coating of claim 2 wherein said polyurethane material comprises approximately six (6) percent aromatic solvent.

4. The coating of claim 2 wherein said aromatic solvent comprises a solvent selected from the group consisting of methylbenzene, toluene, methylethylketone, xylene and combinations thereof.

5. The coating of claim 1 wherein said material susceptible to corrosive deteriorization is concrete, and said polyurethane material is approximately 125 mils thick, and wherein said polyethylene is approximatelY 10 mils thick.

6. The coating of claim 1 wherein said polyethylene layer has at least one surface roughened before being bonded to said layer of polyurethane.

7. A coating for material susceptible to corrosive deteriorization by contact with elements, comprising:

a. a layer of polyurethane material bonded to an exposed surface of said material susceptible to corrosive deteriorization; and

b. a polyvinylchloride layer bonded to said layer of polyurethane and substantially separated from said material.