WO1995018079A1 - Process for applying oxidation barrier to steel surface - Google Patents

Process for applying oxidation barrier to steel surface Download PDF

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Publication number
WO1995018079A1
WO1995018079A1 PCT/US1994/014424 US9414424W WO9518079A1 WO 1995018079 A1 WO1995018079 A1 WO 1995018079A1 US 9414424 W US9414424 W US 9414424W WO 9518079 A1 WO9518079 A1 WO 9518079A1
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WO
WIPO (PCT)
Prior art keywords
steel
insulation
applying
steel substrate
aluminum phosphate
Prior art date
Application number
PCT/US1994/014424
Other languages
French (fr)
Inventor
Roberta L. Alkire
Michael E. Evans
William S. Miller
Original Assignee
Owens Corning
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Owens Corning filed Critical Owens Corning
Publication of WO1995018079A1 publication Critical patent/WO1995018079A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials
    • C04B2111/00525—Coating or impregnation materials for metallic surfaces

Definitions

  • This invention relates generally to a process for applying an oxidation barrier to the surface of a steel substrate. More particularly, the invention is directed to a process for coating steel with an oxidation barrier layer, by contacting the surface of the steel with amorphous aluminum phosphate polymer coated fiberglass insulation; and to oxidation preventing insulation systems employing same.
  • Insulated mechanical systems such as fiberglass encapsulated steel process piping and fiberglass covered boilers and related equipment, are well-known and extensively used throughout modern industry. Such systems generally require the use of a corrosion-resistant coating on the exterior surface of the steel process equipment, which is then overlaid with one or more thicknesses of fiberglass insulation. This corrosion-resistant coating is required to prevent deterioration of the steel surface which would otherwise occur as a result of thermal cycling of the process equipment. Moreover, it is difficult and expensive to remove (and later, reapply) the insulation from such systems in order to de-scale and recoat the surfaces of the equipment.
  • High and low density fibrous glass insulation products generally comprise a mat of glass fibers bonded together by an inorganic or organic binder. Molten streams of glass are drawn into fibers of random lengths and blown into a forming chamber where they are randomly deposited as a mat onto a traveling conveyor. The fibers, while in transit in the forming chamber and while still hot from the drawing operation, are sprayed with an aqueous binder.
  • the residual heat from the glass fibers and the flow of air through the fibrous mat during the forming operation are generally sufficient to volatilize a majority of the water from the binder, thereby leaving the remaining components of the binder on the fibers as a viscous or semi-viscous high-solids liquid.
  • the coated fibrous mat is then transferred by a conveyor to a curing oven where heated air is blown through the mat to cure the binder and rigidly bond the glass fibers together.
  • a high-density or low-density insulation product may be produced.
  • U.S. Patent No. 5,223,336 to Griffith et al. discloses a glass fiber insulation product made by applying an aqueous acid aluminum phosphate binder to glass fibers and thereafter curing the binder by applying heat and removing water, to form an insulation product comprising glass fibers coated with an amorphous aluminum phosphate polymer.
  • Corrosion-resistant coatings are well-known and may comprise anti-oxidation paints, metal coatings such as zinc or nickel, or inorganic materials such as certain phosphates.
  • 5,203,930 discloses a process for forming phosphate coatings on metal surfaces, wherein a ferrous ion-containing phosphating solution comprising Zn, P 2 O 5 , NO 3 , ferrous, and ferric ions is brushed, sprayed, troweled, etc. onto a metal surface.
  • a ferrous ion-containing phosphating solution comprising Zn, P 2 O 5 , NO 3 , ferrous, and ferric ions is brushed, sprayed, troweled, etc. onto a metal surface.
  • the disclosed coating process, as well as the other well-known coating processes are costly and difficult to apply to steel process equipment already erected in the field.
  • the process comprises: providing a steel substrate, having a surface; preparing amorphous aluminum phosphate polymercoated fiberglass insulation; and contacting the insulation with the surface ofthe steel substrate at a temperature greater than about 230°C.
  • the invention further includes an oxidation preventing insulation system comprising: a steel substrate, having a surface; amorphous aluminum phosphate polymer coatedfiberglass insulation adjacent the surface ofthe steel substrate; and an oxidation barrier coating intermediate thesteel substrate and fiberglass insulation, said coating formed as a result of contact between the steel substrate and the fiberglass insulation at a temperature greater than about 230°C.
  • the present invention is particularly useful for insulation systems for steel process equipment such as piping, boilers, ovens, tanks, reaction vessels, etc.
  • Steel substrates for use according to the present invention include those items which are conventionally covered by insulation products for personnel protection and/or energy conservation purposes, and include process and utility piping, pumps, valves, boilers, ovens, furnaces, tanks, reaction vessels, and the like.
  • Steel is the generic name for a group of metals principally comprising iron. Generally, steels, are classified by chemical composition as carbon, alloy, or stainless steels. Steels and their methods of manufacture are well-known.
  • oxidation as it is used herein is meant the oxidation of steel to form iron oxide (rust), as is well-known.
  • Fiberglass insulation for use according to the present invention may be made by any conventional process.
  • glass fibers are generated by a rotary extrusion process and gathered in a moving forming section to form a fiberglass mat.
  • molten glass is introduced to a rotating spinner having a cylindrically shaped side wall including a plurality of orifices.
  • the molten glass is extruded through the orifices by the centrifugal force provided by the rotating spinner, to form fibers.
  • the glass passing through the orifices is maintained in a plastic, attenuable condition by heat supplied by a plurality of adjacent burners.
  • a high pressure annular blower which surrounds the spinner attenuates the fibers and forces them downwardly into a moving forming chamber where the fibers accumulate to form a mat of fiberglass.
  • fiberglass and “glass fibers” as they are used herein are meant fibers of glass, slag, or other mineral material.
  • the glass fibers typically have diameters from about 2 to about 12 microns and have lengths from about V ⁇ inch (6.35 mm) to about 3 inches (76.2 mm). Preferably, the glass fibers range in diameter from about 3 to about 8 microns, and have lengths from about V2 inch (12.7 mm) to about IV-2 inch (38.1 mm).
  • the glass fibers are deposited onto a perforated, endless forming conveyor within a forming chamber. Binder is applied to the glass fibers as they are being formed by means of spray applicators so as to result in a distribution ofthe binder throughout the formed mat of fibrous glass.
  • the glass fibers, having the uncured binder adhered thereto, are gathered and formed into a mat on the endless conveyor within the forming chamber with the aid of a vacuum drawn through the mat from below the forming conveyor.
  • the residual heat contained in the glass fibers as well as the air flow through the mat causes a majority ofthe water to volatilize from the coated mat before it exits the forming chamber.
  • the binder coated fiberglass mat is then conveyed to and through a curing oven where heated air is passed through the mat to cure the binder. Moving flights above and below the mat compress the mat, to give the resultant cured fiberglass batt a predetermined thickness and surface finish.
  • the coated fiberglass mat may be passed through a series of dies during the curing operation to form an annularly shaped batt which may be used as a pipe insulation product.
  • the binder ofthe present invention is an aqueous acid aluminum phosphate, comprising a mixture of aluminum oxide, ortho-phosphoric acid, and water, in a molar ratio for Al 2 O 3 to P 2 O 5 of less than about 1, and preferably in the range from about 0.5 to about 0.25.
  • the aluminum oxide is added to the water/phosphoric acid mixture which has been heated to a temperature above about 100°C. A clear viscous solution is formed, which can then be diluted with additional water to prepare a binder which may be sprayed onto the glass fibers as explained hereinabove.
  • Methods for preparing the binder according to the present invention are more fully set forth in U.S. Patent No. 5,223,336 which is incorporated herein in its entirety by reference thereto.
  • the coated glass fibers are conveyed through a curing oven maintained at a temperature from about 315°C to about 425°C.
  • the curing oven is maintained at a temperature from about 375°C to about 400°C.
  • the coated fiberglass mat resides within the curing oven for a period of time from about Vi minute to about 3 minutes.
  • the residence time is from about V ⁇ minute to V ⁇ minute.
  • the aqueous acid aluminum phosphate polymerizes or cures to form a water insoluble, amorphous aluminum phosphate polymer.
  • the fibrous glass having a cured, rigid binder polymer matrix emerges from the curing oven in the form of a batt for use as an insulation product to be used in combination with a steel substrate.
  • the amorphous aluminum phosphate polymer coated fiberglass insulation is then placed in contact with the surface ofthe steel substrate.
  • an oxidation barrier coating forms on the surface ofthe steel substrate.
  • the resultant oxidation barrier coating prevents rust from forming on the exterior ofthe steel substrate.
  • a highly resistant oxidation barrier forms at steel substrate temperatures from about 340°C to about 550°C.
  • Fiberglass mat is prepared by a rotary process and coated with aqueous acid aluminum phosphate.
  • the coated fiberglass is subjected to the curing conditions set forth in the following Table, and placed adjacent to and in contact with mild carbon steel coupons which are maintained at various temperatures, as indicated. It is observed that oxidation resistant coatings are prepared at temperatures above about 300°C.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

A process for applying an oxidation barrier to a steel substrate comprises contacting the surface of the substrate with amorphous aluminum phosphate polymer coated fiberglass insulation at a temperature of at least about 230 °C.

Description

PROCESS FOR APPLYING OXIDATION BARRIER TO STEEL SURFACE
TECHNICAL FIELD This invention relates generally to a process for applying an oxidation barrier to the surface of a steel substrate. More particularly, the invention is directed to a process for coating steel with an oxidation barrier layer, by contacting the surface of the steel with amorphous aluminum phosphate polymer coated fiberglass insulation; and to oxidation preventing insulation systems employing same.
BACKGROUND ART Insulated mechanical systems, such as fiberglass encapsulated steel process piping and fiberglass covered boilers and related equipment, are well-known and extensively used throughout modern industry. Such systems generally require the use of a corrosion-resistant coating on the exterior surface of the steel process equipment, which is then overlaid with one or more thicknesses of fiberglass insulation. This corrosion-resistant coating is required to prevent deterioration of the steel surface which would otherwise occur as a result of thermal cycling of the process equipment. Moreover, it is difficult and expensive to remove (and later, reapply) the insulation from such systems in order to de-scale and recoat the surfaces of the equipment.
Steel process equipment which is maintained at an elevated temperature is usually covered with fiberglass insulation for personnel protection and energy conservation purposes. Typical equipment includes process and utility piping, pumps, fittings, boilers, tanks, reaction vessels, etc., as is well-known. High and low density fibrous glass insulation products generally comprise a mat of glass fibers bonded together by an inorganic or organic binder. Molten streams of glass are drawn into fibers of random lengths and blown into a forming chamber where they are randomly deposited as a mat onto a traveling conveyor. The fibers, while in transit in the forming chamber and while still hot from the drawing operation, are sprayed with an aqueous binder. The residual heat from the glass fibers and the flow of air through the fibrous mat during the forming operation are generally sufficient to volatilize a majority of the water from the binder, thereby leaving the remaining components of the binder on the fibers as a viscous or semi-viscous high-solids liquid. The coated fibrous mat is then transferred by a conveyor to a curing oven where heated air is blown through the mat to cure the binder and rigidly bond the glass fibers together. Depending upon the vertical distance between the upper and lower flights within the curing oven, a high-density or low-density insulation product may be produced.
U.S. Patent No. 5,223,336 to Griffith et al. discloses a glass fiber insulation product made by applying an aqueous acid aluminum phosphate binder to glass fibers and thereafter curing the binder by applying heat and removing water, to form an insulation product comprising glass fibers coated with an amorphous aluminum phosphate polymer. Corrosion-resistant coatings are well-known and may comprise anti-oxidation paints, metal coatings such as zinc or nickel, or inorganic materials such as certain phosphates. U.S. Patent No. 5,203,930 discloses a process for forming phosphate coatings on metal surfaces, wherein a ferrous ion-containing phosphating solution comprising Zn, P2O5, NO3, ferrous, and ferric ions is brushed, sprayed, troweled, etc. onto a metal surface. However, the disclosed coating process, as well as the other well-known coating processes, are costly and difficult to apply to steel process equipment already erected in the field.
It must be noted that the prior art referred to hereinabove has been collected and examined only in light of the present invention as a guide. It is not to be inferred that such diverse art would otherwise be assembled absent the motivation provided by the present invention, nor that the cited prior art when considered in combination suggests the present invention absent the teachings herein.
It would be desirable to prepare an oxidation preventing insulation system which does not require the application of a corrosion-resistant coating to the process equipment before the application of fiberglass insulation thereover.
DISCLOSURE OF INVENTION Accordant with the present invention, a process for applying an oxidation barrier to a steel substrate surprisingly has been discovered. The process comprises: providing a steel substrate, having a surface; preparing amorphous aluminum phosphate polymercoated fiberglass insulation; and contacting the insulation with the surface ofthe steel substrate at a temperature greater than about 230°C.
The invention further includes an oxidation preventing insulation system comprising: a steel substrate, having a surface; amorphous aluminum phosphate polymer coatedfiberglass insulation adjacent the surface ofthe steel substrate; and an oxidation barrier coating intermediate thesteel substrate and fiberglass insulation, said coating formed as a result of contact between the steel substrate and the fiberglass insulation at a temperature greater than about 230°C.
The present invention is particularly useful for insulation systems for steel process equipment such as piping, boilers, ovens, tanks, reaction vessels, etc.
BEST MODE FOR CARRYING OUT THE INVENTION Steel substrates for use according to the present invention include those items which are conventionally covered by insulation products for personnel protection and/or energy conservation purposes, and include process and utility piping, pumps, valves, boilers, ovens, furnaces, tanks, reaction vessels, and the like. Steel is the generic name for a group of metals principally comprising iron. Generally, steels, are classified by chemical composition as carbon, alloy, or stainless steels. Steels and their methods of manufacture are well-known. By the term "oxidation" as it is used herein is meant the oxidation of steel to form iron oxide (rust), as is well-known.
Fiberglass insulation for use according to the present invention may be made by any conventional process. Preferably, glass fibers are generated by a rotary extrusion process and gathered in a moving forming section to form a fiberglass mat.
Molten glass is introduced to a rotating spinner having a cylindrically shaped side wall including a plurality of orifices. The molten glass is extruded through the orifices by the centrifugal force provided by the rotating spinner, to form fibers. The glass passing through the orifices is maintained in a plastic, attenuable condition by heat supplied by a plurality of adjacent burners. A high pressure annular blower which surrounds the spinner attenuates the fibers and forces them downwardly into a moving forming chamber where the fibers accumulate to form a mat of fiberglass. By the terms "fiberglass" and "glass fibers" as they are used herein are meant fibers of glass, slag, or other mineral material. The glass fibers typically have diameters from about 2 to about 12 microns and have lengths from about V→ inch (6.35 mm) to about 3 inches (76.2 mm). Preferably, the glass fibers range in diameter from about 3 to about 8 microns, and have lengths from about V2 inch (12.7 mm) to about IV-2 inch (38.1 mm). The glass fibers are deposited onto a perforated, endless forming conveyor within a forming chamber. Binder is applied to the glass fibers as they are being formed by means of spray applicators so as to result in a distribution ofthe binder throughout the formed mat of fibrous glass. The glass fibers, having the uncured binder adhered thereto, are gathered and formed into a mat on the endless conveyor within the forming chamber with the aid of a vacuum drawn through the mat from below the forming conveyor. The residual heat contained in the glass fibers as well as the air flow through the mat causes a majority ofthe water to volatilize from the coated mat before it exits the forming chamber. Methods for forming glass fibers into a mat are more fully set forth in U.S. Patent No. 4,917,715 which is incorporated herein in its entirety by reference thereto.
The binder coated fiberglass mat is then conveyed to and through a curing oven where heated air is passed through the mat to cure the binder. Moving flights above and below the mat compress the mat, to give the resultant cured fiberglass batt a predetermined thickness and surface finish. Alternatively, the coated fiberglass mat may be passed through a series of dies during the curing operation to form an annularly shaped batt which may be used as a pipe insulation product. The binder ofthe present invention is an aqueous acid aluminum phosphate, comprising a mixture of aluminum oxide, ortho-phosphoric acid, and water, in a molar ratio for Al2O3 to P2O5 of less than about 1, and preferably in the range from about 0.5 to about 0.25. Typically, the aluminum oxide is added to the water/phosphoric acid mixture which has been heated to a temperature above about 100°C. A clear viscous solution is formed, which can then be diluted with additional water to prepare a binder which may be sprayed onto the glass fibers as explained hereinabove. Methods for preparing the binder according to the present invention are more fully set forth in U.S. Patent No. 5,223,336 which is incorporated herein in its entirety by reference thereto.
The coated glass fibers are conveyed through a curing oven maintained at a temperature from about 315°C to about 425°C. Preferably, the curing oven is maintained at a temperature from about 375°C to about 400°C. Generally, the coated fiberglass mat resides within the curing oven for a period of time from about Vi minute to about 3 minutes. Preferably, the residence time is from about V→ minute to VΛ minute. Under these conditions, the aqueous acid aluminum phosphate polymerizes or cures to form a water insoluble, amorphous aluminum phosphate polymer. The fibrous glass having a cured, rigid binder polymer matrix emerges from the curing oven in the form of a batt for use as an insulation product to be used in combination with a steel substrate.
The amorphous aluminum phosphate polymer coated fiberglass insulation is then placed in contact with the surface ofthe steel substrate. As the steel substrate having the polymer coated fiberglass insulation in contact therewith is heated to a temperature greater than about 230°C, an oxidation barrier coating forms on the surface ofthe steel substrate. The resultant oxidation barrier coating prevents rust from forming on the exterior ofthe steel substrate. Preferably, a highly resistant oxidation barrier forms at steel substrate temperatures from about 340°C to about 550°C. While not wishing to be bound by any particular theory regarding the mechanism by which the steel substrate is provided with an oxidation barrier according to the present invention, it is believed that a portion ofthe amorphous aluminum phosphate polymer matrix ofthe fiberglass insulation pyrolyses to form an inorganic phosphate coating on the surface ofthe steel substrate.
EXAMPLES Fiberglass mat is prepared by a rotary process and coated with aqueous acid aluminum phosphate. The coated fiberglass is subjected to the curing conditions set forth in the following Table, and placed adjacent to and in contact with mild carbon steel coupons which are maintained at various temperatures, as indicated. It is observed that oxidation resistant coatings are prepared at temperatures above about 300°C. TABLE
APPLICATION OF OXIDATION BARRIER TO STEEL Comparison Example 1 Example 2 Example 3
Cure Conditions 375°C 375°C 375°C 375°C ffi 24 hr. @ 24 hr. @ 24 hr. @ 24 hr.
Steel Substrate 23°C 230°C 340°C 455°C Temperature
Oxidation Barrier No Yes Yes Yes Formed
Color of Oxidation Blue Brown Black Barrier
While certain representative details and embodiments have been set forth for the purpose of illustrating the invention, it will be apparent to those ordinarily skilled in the art that various changes may be made therein, and that the invention may be practiced otherwise than as specifically illustrated and described without departing from its spirit and scope.

Claims

1. A process for applying an oxidation barrier to steel, comprising: providing a steel substrate, having a surface; preparing amorphous aluminum phosphate polymercoated fiberglass insulation; and contacting the insulation with the surface ofthe steel substrate at a temperature greater than about 230°C.
2. The process for applying an oxidation barrier to steel according to Claim 1, wherein the step of preparing amorphous aluminum phosphate polymer coated fiberglass insulation comprises: forming a mat of glass fibers; applying to the glass fibers an aqueous acidaluminum phosphate; and curing the aqueous acid aluminum phosphate toform an amorphous aluminum phosphate polymer.
3. The process for applying an oxidation barrier to steel according to
Claim 2, wherein the step of forming the mat of glass fibers comprises a rotary extrusion process.
4. The process for applying an oxidation barrier to steel according to Claim 2, wherein the aqueous acid aluminum phosphate is applied to the glass fibers by spraying during the forming ofthe mat.
5. The process for applying an oxidation barrier to steel according to Claim 2, wherein the aqueous acid aluminum phosphate comprises a mixture of aluminum oxide, ortho-phosphoric acid, and water.
6. The process for applying an oxidation barrier to steel according to Claim 5, wherein the molar ratio of aluminum oxide to ortho-phosphoric acid in the mixture is less than about 1.
7. The process for applying an oxidation barrier to steel according to Claim 2, wherein the aqueous acid aluminum phosphate is cured at a temperature from about 315°C to about 425°C.
8. The process for applying an oxidation barrier to steel according to
Claim 2, wherein the aqueous acid aluminum phosphate is cured for a period of time from about Vi minute to about 3 minutes.
9. The process for applying an oxidation barrier to steel according to Claim 1, wherein contacting the insulation with the surface ofthe steel substrate occurs at a temperature from about 230°C to about 550°C.
10. A process for applying an oxidation barrier to steel, comprising: providing a steel substrate, having a surface; preparing amorphous aluminum phosphate polymercoated fiberglass insulation by a process comprising: forming, by a rotary extrusion process, amat of glass fibers; applying to the glass fibers, by a spraying process during the forming step, an aqueous acid aluminum phosphate, comprising a mixture of aluminum oxide, ortho-phosphoric acid, and water, the ratio of aluminum oxide to orth-phosphoric acid being from about 0.5 to about 0.25; and curing the aqueous acid aluminum phosphateat a temperature from about 375°C to about 400°C for a period of time from about
VA minute to about 1 V minutes; and contracting the insulation with the surface ofthe steel substrate at a temperature from about 340°C to about 550°C.
11. An oxidation preventing insulation system, comprising: a steel substrate, having a surface; amorphous aluminum phosphate polymer coatedfiberglass insulation adjacent the surface ofthe steel substrate; and an oxidation barrier coating intermediate thesteel substrate and fiberglass insulation, said coating being formed as a result of contact between the steel substrate and the fiberglass insulation at a temperature greater than about 230°C.
12. An oxidation preventing insulation system according to Claim 11, wherein the steel substrate is a pipe, pump, boiler, furnace, oven, tank, or reaction vessel.
13. An oxidation preventing insulation system according to Claim 11, wherein the polymer coated fiberglass insulation comprises glass fibers having diameters from about 2 microns to about 12 microns.
14. An oxidation preventing insulation system according to Claim 11, wherein the polymer coated fiberglass insulation comprises glass fibers having lengths from about V→ inch (6.35 mm) to about 3 inches (76.2 mm).
15. The oxidation preventing insulation system according to Claim 11 , wherein the amorphous aluminum phosphate polymer is a reaction product of a mixture comprising aluminum oxide, ortho-phosphoric acid, and water.
16. The oxidation preventing insulation system according to Claim 11, wherein the barrier coating forms as a result of contact between the steel substrate and the fiberglass insulation at a temperature from about 340°C to about 550°C.
17. An oxidation preventing insulation system, comprising: a steel substrate, said steel substrate being apipe, pump, boiler, furnace, oven, tank, or reaction vessel, said steel substrate having a surface; amorphous aluminum phosphate polymer coated fiberglass insulation adjacent the surface ofthe steel substrate, said fiberglass insulation comprising glass fibers having diameters from about 3 microns to about 8 microns and lengths from about V2 inch (12.7 mm) to about VΔ inches (38.1 mm); and an oxidation barrier coating intermediate thesteel substrate and fiberglass insulation, said coating being formed as a result of contact between the steel substrate and the fiberglass insulation at a temperature from about 340°C to about 550°C.
PCT/US1994/014424 1993-12-27 1994-12-15 Process for applying oxidation barrier to steel surface WO1995018079A1 (en)

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US17322393A 1993-12-27 1993-12-27
US08/173,223 1993-12-27

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB714756A (en) * 1951-01-01 1954-09-01 Stewarts & Lloyds Ltd External coverings for iron or steel pipes
FR1086729A (en) * 1953-11-10 1955-02-15 Siplast Corrosion protection material
JPS52112636A (en) * 1976-03-18 1977-09-21 Nippon Asbestos Co Ltd Mineral adhesive
JPS63111183A (en) * 1986-10-30 1988-05-16 Nippon Fueroo Kk Method for preventing oxidation of metal surface
US4917715A (en) * 1988-12-27 1990-04-17 Owens-Corning Fiberglas Corporation Method for producing rotary textile fibers
EP0539342A1 (en) * 1991-09-30 1993-04-28 Monsanto Company Glass fiber insulation and process
FR2690439A1 (en) * 1992-04-24 1993-10-29 Fumisterie Indle Entreprises Low cement content insulating refractory concrete - capable of phosphate bonding, useful for high temp. linings

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB714756A (en) * 1951-01-01 1954-09-01 Stewarts & Lloyds Ltd External coverings for iron or steel pipes
FR1086729A (en) * 1953-11-10 1955-02-15 Siplast Corrosion protection material
JPS52112636A (en) * 1976-03-18 1977-09-21 Nippon Asbestos Co Ltd Mineral adhesive
JPS63111183A (en) * 1986-10-30 1988-05-16 Nippon Fueroo Kk Method for preventing oxidation of metal surface
US4917715A (en) * 1988-12-27 1990-04-17 Owens-Corning Fiberglas Corporation Method for producing rotary textile fibers
EP0539342A1 (en) * 1991-09-30 1993-04-28 Monsanto Company Glass fiber insulation and process
FR2690439A1 (en) * 1992-04-24 1993-10-29 Fumisterie Indle Entreprises Low cement content insulating refractory concrete - capable of phosphate bonding, useful for high temp. linings

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 2588, Derwent World Patents Index; AN 88-172503 *
DATABASE WPI Week 4477, Derwent World Patents Index; AN 77-78478y *

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