Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/02—Sealings between relatively-stationary surfaces
  • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
  • F16J15/064—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces the packing combining the sealing function with other functions
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • 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
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/60—Additives non-macromolecular
  • C09D7/61—Additives non-macromolecular inorganic
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/28—Nitrogen-containing compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/38—Boron-containing compounds

Definitions

• Gaskets are well known and used in a variety of fluid applications to seal joints, valves, and other openings. Gaskets may also be used in various other applications, such as applications requiring vibration isolation, and/or sound isolation, for example. Such applications often involve two surfaces, referred to as mating surfaces that are fitted together with a gasket in between, completing a seal between the two surfaces.
• the surfaces must be separated, such as for maintenance or repair of a joint or valve.
• residue is often required to be removed prior to installation of a new gasket in its joining assembly, ensuring a tight seal.
• excessive effort is required to separate the surfaces between which the gasket resides. This may be due to a number of factors, such as bonding of the gasket material to mating surfaces, which can result in a significant amount of force being required to separate the two surfaces.
• a gasket body is provided with a coating of release agent on both surfaces of the gasket body that contact mating surfaces of a joining assembly.
• Other embodiments may include a gasket body that has a coating on a single surface, or a portion of one or more surfaces.
• the gasket body may be formed of organic and inorganic non-metallic and metallic gasket body materials, such as, for example, gasket paper, elastomers, stainless steel, cork, felt, graphite, fiberglass, and/or a polymer such as polytetrafluoroethylene, polypropylene, and the like.
• the gasket body includes reinforcing materials as well.
• the coating in some embodiments, is a release agent that enhances the removal of the gasket after installation in a joining assembly.
• the coating may be provided as a mixture of constituents including, primarily, hexagonal boron nitride (BN).
• the coating may be applied to the gasket body by any of a number of methods, including painting, spreading, roll coating, spraying, and/or dipping.
• the coating may also be applied to the gasket body in a single application step, or in more than one step.
• the release agent coating includes a number of constituents, including a release agent and a binding material that enhances the adhesion of the release agent to the gasket body surface(s).
• a binding material may include, for example, organic or inorganic materials.
• Surfactants in some embodiments, may be added to a gasket release agent dispersion in addition to binder materials and fillers. Surfactants promote wetting of the coating material with the surface material of the gasket body. Binding agents and surfactants are dependent on the substrate. Accordingly, in some embodiments neither will be required.
• a flange assembly of various embodiments may be provided to test various gaskets under simulated operating conditions in order to verify gasket performance.
• a coated gasket may have a coating of 100% hexagonal boron nitride.
• the gasket and coating may be tested at a specified bolt load and at a specified temperature to determine if the gasket releases from the flange surfaces after being exposed to the simulated operating conditions for a period of time.
• a coated gasket may be mounted in flange assembly between two flanges. The flanges may then be secured to one another with washers, bolts, and nuts, which are tightened to a desired bolt load. The assembly may then be subjected to simulated operating conditions. Thereafter, the flange assembly is removed from the simulated operating conditions, and the two flanges are separated while determining the force required to separate the flanges.
• Figure 1 depicts a partial cross-section view of one embodiment of a coated gasket according to the present technology.
• Figure 2 depicts a plan view of a an embodiment of a coated gasket according to the present technology, in which half of the gasket body is removed to better illustrate the coating on the gasket body surfaces.
• Figure 3 depicts a perspective view of the coated gasket depicted in Figure 2.
• Figure 4 depicts an exploded, elevation view of one embodiment of a flange assembly that may be used to test gaskets in order to verify gasket performance.
• Figure 5 depicts a perspective view of the flange assembly depicted in Figure 4 in an assembled position.
• Figure 6 depicts a side elevation view of the flange assembly depicted in Figure 5.
• Figure 7 depicts a top, plan view of the flange assembly depicted in Figure 5.
• release agents such as graphite powder, which is suitable for some applications.
• release agents are commonly messy, as the powder is black and often soils nearby items, which is often not desirable.
• release agents can break down at relatively high temperatures, resulting in additional residue that is left on a mating surface after separation of the joining assembly components.
• Various embodiments of the present disclosure provide methods, systems, and apparatuses that enable gaskets to release from mating surfaces where the joining assembly is exposed to high temperatures, as well as provides a cleaner gasket for installation.
• a coated gasket 20 of an embodiment is described.
• Fig. 1 illustrates a partial cross-section of a coated gasket 20 of this embodiment, hi this embodiment, a gasket body 24 has a coating 28 of release agent on both surfaces of the gasket body 24 that will contact mating surfaces of a joining assembly.
• Fig. 2 illustrates a plan view of a coated gasket 20, in which half of the gasket body 20 is removed to better illustrate the coating 28 on the gasket body 24 surfaces.
• Fig. 3 illustrates a perspective view of the coated gasket 20 of Fig. 2.
• Other embodiments may include a gasket body 24 that has a coating 28 only on a single surface, or a portion of one or more surfaces.
• the gasket body 24 may be formed of organic and inorganic non-metallic and metallic gasket body materials, such as, for example, gasket paper, elastomers, stainless steel, cork, felt, graphite, fiberglass, and/or a polymer (such as polytetrafluoroethylene, polypropylene, and etc.).
• gasket paper such as, for example, gasket paper, elastomers, stainless steel, cork, felt, graphite, fiberglass, and/or a polymer (such as polytetrafluoroethylene, polypropylene, and etc.
• a polymer such as polytetrafluoroethylene, polypropylene, and etc.
• the gasket body 24 may include reinforcing materials as well, as is also well known and will be readily understood by one of skill in the art.
• the coating 28, in an embodiment, is a release agent that enhances the removal of the gasket 20 after installation in a joining assembly (not shown).
• the coating 28, in an embodiment, is a mixture of constituents including, primarily, hexagonal boron nitride (BN).
• BN hexagonal boron nitride
• the coating 28 is applied to the gasket body 24 by any of a number of methods, including roll coating, spraying, and/or dipping.
• the coating 28 may be applied to the gasket body 24 in a single application step, or in more than one step.
• the release agent coating 28 includes a number of constituents, including BN that acts primarily as a release agent, and a binding material that enhances the adhesion of the BN to the gasket body 24 surface(s).
• a binding material may include, for example, organic materials.
• a binding material may also include inorganic materials, which are stable at elevated temperatures. Binding material that may enhance the performance of a gasket release coating 28 comprising BN, include but are not limited to natural and synthetic polymers (organic and inorganic) and natural and synthetic minerals. Inorganic binders and fillers that may be used in some embodiments are effective for relatively large temperature ranges, such as ambient temperature to 900 0 F, due to their high temperature resistance.
• inorganic materials used as binders or fillers include, but are not limited to, silicates (colloidal silica, potassium, sodium, and lithium), oxides (aluminum, zirconium, silicon, and magnesium), phyllosilicates (talc, mica, and vermiculite), and clays (kaolin, bentonite, and halloysite).
• Some polymer binders or fillers include, but are not limited to, thermoplastic (polyethylene, polypropylene, polyvinyl acetate, and acrylics), fluoropolymer (polytetrafluoroethylene, fluorinated ethylene-propylene, and perfluoroalkoxy resin), thermoset (urethanes, epoxides, rubbers), naturally occurring polysaccharide media (starches, gums, and cellulose resins), waxes (beeswax, carnauba, paraffin) work well for the purpose of binding the coating to the sheet.
• thermoplastic polyethylene, polypropylene, polyvinyl acetate, and acrylics
• fluoropolymer polytetrafluoroethylene, fluorinated ethylene-propylene, and perfluoroalkoxy resin
• thermoset urethanes, epoxides, rubbers
• naturally occurring polysaccharide media starches, gums, and cellulose resins
• Surfactants may be added to a gasket release agent dispersion in addition to binder materials and fillers. Surfactants promote wetting of the coating material with the surface material of the gasket body. Commonly used surfactants include, but are not limited to, anionic (sodium dodecyl sulfate, sodium lauryl ether sulfate, and soaps) and nonionic (polyethylene glycol octyphenyl ether, poly(ethylene oxide) and poly (propylene oxide) copolymers, alcohols, alkyl poly(ethylene oxide), and alkyl polyglucosides). Binding agents and surfactants are dependent on the substrate; in some cases neither will be required.
• a coating comprises a mixture of release agent, binding agent, and surfactant.
• the release agent comprises hexagonal boron nitride in quantities ranging from 0.01% to 100%, by volume, of the dry coating previously applied to the gasket.
• the binding agent and/or filler component comprises one or more of the above-noted binding and/or filler materials in quantities ranging from 0% to 80%, by volume, of the dry coating previously applied to the gasket.
• the surfactant comprises one OP more of the above-noted surfactants in quantities ranging from 0% to 40%, by volume, of the dry coating previously applied to the gasket.
• a sheet of gasket material is formed using traditional techniques.
• the sheet of gasket material is fed into a roll coater that coats the gasket material with coating 28.
• the roll coater in this example provides a coating that comprises hexagonal boron nitride, binder material, filler material, and surfactants.
• the coating is a hexagonal boron nitride dispersion that initially comprises 25% (by volume) hexagonal boron nitride and 3% alumina binder.
• the dispersion is diluted with distilled water to contain 2.5% hexagonal boron nitride and 0.3% binder.
• a surfactant, Triton X-100 is also added to the diluted dispersion until the dispersion includes 1% surfactant.
• the dispersion as mentioned, is applied to the gasket material using a roll coater, and the coated gasket material is placed in a drying oven to evaporate water from the dispersion.
• the dried coating of this example comprises a range of solids, depending on the percentage of surfactant present upon drying in an elevated temperature environment.
• the range of solids for the dried coating is approximately 66% to 90% hexagonal boron nitride, approximately 7% to 10% alumina, and approximately 0% to 26% Triton X-100.
• the coated sheet of gasket material is then cut into any desired configuration as required by the particular application for the gasket.
• a sheet of gasket material is formed using traditional techniques.
• the sheet of gasket material is fed into a roll coater that coats the gasket material with coating 28.
• the roll coater in this example provides a coating that comprises hexagonal boron nitride, binder material, and surfactants.
• the coating is a hexagonal boron nitride dispersion that comprises 40% (by volume) hexagonal boron nitride, 0% binder, and 0% surfactant, with the remainder of the dispersion being distilled water.
• the dispersion as mentioned is applied to the gasket material using a roll coater, and the coated gasket material is placed in a drying oven to evaporate water from the dispersion.
• the dried coating of this example comprises 100% hexagonal boron nitride.
• the coated sheet of gasket material is then cut into any desired configuration as required by the particular application for the gasket.
• a sneet ot gasket mate ⁇ al is torme ⁇ using traditional tecnmques.
• the sheet of gasket material is fed into a roll coater that coats the gasket material with coating 28.
• the roll coater in this example provides a coating that comprises hexagonal boron nitride, filler material, binder material, and surfactants.
• the coating is a hexagonal boron nitride dispersion that comprises 25% (by volume) hexagonal boron nitride, 20% inorganic clay filler material, 5% silicate binder, and 0% surfactant with the remainder being distilled water.
• the dispersion as mentioned is applied to the gasket material using a roll coater, and the coating gasket material is placed in a drying oven to evaporate water from the dispersion.
• the dried coating of this example comprises 50% hexagonal boron nitride, 40% inorganic clay filler, and 10% silicate binder material.
• the coated sheet of gasket material is then cut into any desired configuration as required by the particular application for the gasket.
• the flange assembly 40 is a test assembly that may be used to test a gasket 20 under simulated operating conditions in order to verify gasket performance.
• a coated gasket 20 may have a coating of 100% hexagonal boron nitride. It is desired to test the gasket and coating at a specified bolt load and at a specified temperature to determine if the gasket releases from the flange surfaces after being exposed to the simulated operating conditions for a period of time, hi this embodiment, a coated gasket 20 is mounted in flange assembly 40 between two flanges 44.
• the flanges 44 are secured to one another with washers 48, bolts 52, and nuts 56.
• the nuts 56 and bolts 52 are tightened to a desired bolt load, and the assembled test assembly is subjected to simulated operating conditions.
• the flange assembly 40 is removed from the simulated operating conditions, and the two flanges 44 are separated. When the flanges 44 are separated, the force required to separate the flanges 44 is measured, and the residue left on the flange 44 faces that contact the gasket is observed.
• a stated range of 1 to 10 should be considered to include and provide support for claims that recite any and all subranges or individual values that are between and/or inclusive of the minimum value of 1 and the maximum value of 10; that is, all subranges beginning with a minimum value of 1 or more and ending with a maximum value of 10 or less (e.g., 5.5 to 10, 2.34 to 3.56, and so forth) or any values from 1 to 10 (e.g., 3, 5.8, 9.9994, and so forth).
• Expressions such as “up,” “down,”, “upper,” “lower,” “horizontal,” “vertical,” “left,” “right,” and the like are used, where applicable, to provide some clarity of description when dealing with relative relationships. But, these terms are not intended to imply absolute relationships, positions, and/or orientations. For example, with respect to an object, an "upper” surface can become a “lower” surface simply by turning the object over. Nevertheless, it is still the same object.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Inorganic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Gasket Seals (AREA)
• Sealing Material Composition (AREA)
• Compositions Of Macromolecular Compounds (AREA)

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• 2008
  • 2008-10-28 CN CN200880108267A patent/CN101802067A/zh active Pending
  • 2008-10-28 WO PCT/IB2008/002878 patent/WO2009056944A2/en active Application Filing
  • 2008-10-28 AU AU2008320507A patent/AU2008320507A1/en not_active Abandoned
  • 2008-10-28 CA CA2701941A patent/CA2701941A1/en not_active Abandoned
  • 2008-10-28 MX MX2010003265A patent/MX2010003265A/es unknown
  • 2008-10-28 JP JP2010530584A patent/JP2011501074A/ja active Pending
  • 2008-10-28 BR BRPI0818666A patent/BRPI0818666A2/pt not_active IP Right Cessation
  • 2008-10-28 EP EP08843946A patent/EP2205668A2/de not_active Withdrawn

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