US20060257665A1 - Barrier-coating layer application method - Google Patents
Barrier-coating layer application method Download PDFInfo
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- US20060257665A1 US20060257665A1 US11/412,461 US41246106A US2006257665A1 US 20060257665 A1 US20060257665 A1 US 20060257665A1 US 41246106 A US41246106 A US 41246106A US 2006257665 A1 US2006257665 A1 US 2006257665A1
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- penetration
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- 239000011247 coating layer Substances 0.000 title description 4
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- 239000007921 spray Substances 0.000 claims abstract description 42
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
- F42B39/14—Explosion or fire protection arrangements on packages or ammunition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/32—Safety measures not otherwise provided for, e.g. preventing explosive conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/02—Wall construction
- B65D90/022—Laminated structures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H7/00—Armoured or armed vehicles
- F41H7/02—Land vehicles with enclosing armour, e.g. tanks
- F41H7/04—Armour construction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/34—Applying different liquids or other fluent materials simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
- B32B2037/243—Coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2319/00—Synthetic rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/03177—Fuel tanks made of non-metallic material, e.g. plastics, or of a combination of non-metallic and metallic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K2015/03328—Arrangements or special measures related to fuel tanks or fuel handling
- B60K2015/03407—Arrangements or special measures related to fuel tanks or fuel handling to protect tanks against projectiles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
Definitions
- the present invention concerns itself principally with a spray-application manner for creating the second-mentioned one of these two types of layers, namely, for creating the composite-material layer which includes both an elastomeric body, and a distribution therein of liquid-imbiber beads.
- the desired composite-material layer is formed by merging in air, as what is referred to herein as a sprayed-layer blend, and just before application to a target surface on a target liquid container, i.e., en route to that surface) of two independently sprayed streams of material, one of which sprays contains wet, liquid, high-elastomeric material, and the other of which includes dry, liquid-imbiber beads.
- pre-spray flows of these two kinds of materials are appropriately adjusted relative to one another to end up producing a desired composite-material layer wherein, in the final layer, the sprayed high-elastomeric material accounts for about 78-percent by weight of the layer, and the imbedded, distributed liquid-imbiber beads account for about 22-percent by weight of the final layer.
- a user is offered the option of adjusting, differentially, the relative positions of two spray heads which are employed to create, selectively, different characters of air-blended sprays of the two different layer-forming materials.
- This position adjustability feature allows for both changing the lateral separation between these two spray heads, one for each of the two materials, and also for allowing what is referred to herein as relative longitudinal adjustment so as to position one spray head or the other closer to or further away from an intended target surface where layer formation is to take place.
- This control adjustability allows a user a relatively wide range of options for composite-material layer formation. It does so by varying the length of time that initially dry liquid-imbiber beads are in contact with still-uncured still-liquid elastomeric material.
- FIG. 1 is a simplified, fragmentary cross-sectional view of a portion of a metallic liquid container whose outside surface has been coated with a plural-layer, anti-leakage barrier structure including a central, composite-material layer which has been formed in accordance with practice of the present invention.
- FIG. 2 is a simplified, block/schematic diagram of the basic architecture of the system and methodology of the present invention.
- FIG. 3 is somewhat like FIG. 2 , except that it provides a more detailed block/schematic view of the make up of the present invention.
- FIGS. 4, 5 , and 6 are relatable to what is shown on the right side of FIG. 3 with respect to illustrating several different manners/modalities of supplying a spray-implementable flow of liquid-imbiber beads which form part of the composite-material layer that is created by the present invention.
- FIG. 1 indicated generally at 10 is a three-layer, anti-leak barrier coating including layers 12 , 14 , 16 which have been applied by spraying to the outside surface 18 a of the wall 18 b in a metallic liquid container 18 .
- container 18 is a hydrocarbon fuel tank in a military fuel tanker vehicle (not shown)—a setting wherein the present invention has been found to offer particular utility.
- layers 12 , 16 are substantially purely high-elastomer layers, each formed with a high-elastomeric material which is also referred to herein as a penetration-reaction material, and each having a layer thickness of about 1 ⁇ 4-inches.
- Layer 14 which lies intermediate layers 12 , 16 , is a composite-material layer formed with a high-elastomeric body expanse, or body, 14 a (penetration-reaction material) in which there exists a distribution of a plurality of liquid-imbiber, bead-like elements, or beads, 14 b , also formed by what is referred to herein as a penetration-reaction material.
- layers 12 , 16 are each formed of the same high-elastomeric material which herein takes the form of the products bearing product code numbers 60012 and 60058, made by Rhino Linings USA, Inc. in San Diego, Calif., and sold under the trademark TUFF STUFF®.
- product code numbers 60012 and 60058 made by Rhino Linings USA, Inc. in San Diego, Calif.
- TUFF STUFF® sold under the trademark
- This same high-elastomeric material is the material which forms body 14 a in layer 14 .
- the liquid imbiber beads distributed in layer 14 are formed herein of the material known as IMB230300, made by Imbibitive Technologies America, Inc. in Midland, Mich.
- Layer 14 very specifically, is the layer which is formed specifically in accordance with the features and practice of the present invention. In barrier coating 10 herein as illustrated, this layer has a thickness of about 1 ⁇ 8-inches.
- the receiving surface is either metal, or painted metal
- that surface should be completely dry before primer application.
- unpainted metal surface normally no special surface texturing is necessary before primer application.
- paint-surface profiling to produce about a 1- to about a 3-mil texture is recommended.
- an appropriate primer such as the so-called System 251 primer made by Rhino Linings, USA, Inc. (mentioned above herein), may be used.
- This primer preferably is applied to create a primer layer having a thickness lying in the range of about 2- to about 5-mils. Manufacturer's instructions are entirely adequate to describe both the details of applying this primer to different surfaces, and the conditions which, after primer application, should be observed to indicate readiness of the primer to receive a sprayed overlayer, such as the innermost elastomeric layer discussed herein which lies closest to the outer surface of a protected liquid container.
- the receiving surface for the innermost, barrier-coating elastomeric layer is the outer surface of a plastic container, such as the outer surface of an HDPE fuel tank in a military vehicle
- two things preferably should be done to prepare such a surface for elastomeric layer receipt.
- the surface should be scrubbed/scuffed, as with a rotary wire cup brush, to roughen the surface, and to remove any “surface gloss” of this surface.
- an appropriate adhesion-promoting primer should be sprayed onto the scuffed surface.
- a suitable primer is the two-part catalyzed product known as DPX-801 plastic adhesive primer made by PPG Industries of Strongsville, Ohio.
- Interlayer primer use here should be based upon the same time-interval consideration just discussed above, and an appropriate interlayer primer is the mentioned System 251 primer.
- the present invention focuses upon methodology specifically for creating, in a spray-application manner, composite-material layer 14 .
- FIG. 2 here there is illustrated, at a relatively high schematic level, an overall “picture” of the architecture and practice of the present invention.
- This practice is illustrated in FIG. 2 with four blocks 20 , 22 , 24 , 26 , and by two spray instrumentalities (spray heads) 28 , 30 which are represented in FIG. 2 by labeled arrowheads.
- the present invention focuses on the spray formation of a composite-material layer, like layer 14 , by creating two independent sprays of materials which are directed through independent spray heads, 28 , 30 toward a target surface, such as the exposed surface of high-elastomeric layer 12 . This is done in a fashion whereby the sprays emanating from these spray heads, by the time they arrive at the target surface, will have fully overlapped and merged to become united as a single-application spray.
- the spray directed from spray head 28 is a spray of wet, two-part blended, liquid high-elastomeric material coming, in accordance with what is shown in FIG. 2 , from block 20 wherein it is referred to as Part A.
- Part A is a combination, or blend, of the two components which need to be brought together to create a resulting, catalyzable, high-elastomeric material.
- Flow rate from the supply of this elastomeric material is controlled in any suitable fashion, as is represented very generally by block 22 in FIG. 2 .
- dry liquid-imbiber elements or beads represented by block 24 , and referred to in FIG. 2 as Part B, are directed ultimately for spraying by spray head 30 through a block 26 which represents any suitable form of flow-rate control for these beads.
- appropriate flow-rate controls for the two flows of the two materials are implemented in blocks 22 , 26 to produce, in the region shown generally at 32 in FIG. 2 , a merging and mingling blend of the wet, liquid elastomeric material and beads in a ratio determined to be the desired-by-weight final composition of the resulting spray-created composite-material layer.
- this matter of flow-rate adjustment is performed in such a fashion that the resulting spray-applied composite layer will be represented about 22-percent by weight of the imbiber beads.
- the length of time that the now curing, but still liquid, elastomeric material spends en route from the associated spray head to the target surface can be varied in a manner which thereby determines the state of curing of this material at the point in time when it strikes the target surface.
- the amount of time that the initially dry liquid-imbiber beads spend contactively engaged with still wet liquid elastomeric material may be controlled.
- This area of control plays a role in the manner in which, in the finally created composite layer, the liquid-imbiber beads function as liquid absorbers and three-dimensional swellers—two of the important mechanisms provided by these elements in defeating a puncture-produced leakage wound in a container, such as in container 18 .
- This same set of relative adjustments that may be made between and in regard to the two spray heads, also plays a role in determining, to some extent, the manners in which the included liquid-imbiber beads in the final layer perform a coagulating response to leakage liquid—one of the other mechanisms employed in barrier coating 10 to close off a leakage wound.
- FIG. 3 in the drawings is very much like FIG. 2 , except that it illustrates the broadly presented practice seen in FIG. 2 in slightly greater detail.
- Eight blocks, 34 , 36 , 38 , 40 , 42 , 44 , 46 , 48 are used in FIG. 3 to provide this more detailed view of practice of the invention.
- Blocks 34 , 36 , along with downstream block 44 in FIG. 3 generally relate to block 20 in FIG. 2 , with blocks 40 , 42 in FIG. 3 generally relating to block 22 in FIG. 2 .
- Block 46 in FIG. 3 is related to arrowhead 28 in FIG. 2 .
- Pumping performed by blocks 40 , 42 enables flow-rate control with respect to the flow of wet, liquid elastomeric material.
- Block 38 in FIG. 3 relates to block 24 in FIG. 2 regarding a supply of liquid-imbiber beads.
- a line 50 in FIG. 3 which connects block 38 with spray head 48 illustrated schematically an action of controlled gravity feed of beads from block 38 to block 48 .
- This line represents flow-rate control as implemented by block 26 in FIG. 2 .
- FIG. 3 presents one particular way of implementing the practice of the present invention for the creation of a pair of air-blended sprays of liquid elastomeric material and dry, liquid-imbiber bead material, controlled in a fashion to yield a final composite-material layer, like layer 14 , having the desired content of these two ingredients.
- liquid elastomeric material is fed under positive pumping control, and liquid-imbiber beads are fed under controlled gravity-feed conditions.
- FIG. 3 An arrow which is marked “Air Option”, and which relates, through the bracket touched by this arrow, to the operation of the supply of liquid elastomeric material, is presented in FIG. 3 to provide recognition that one option useable in conjunction with what is otherwise shown in FIG. 3 is the use of pressurized air at one or more appropriate locations to propel the delivery of liquid elastomeric material.
- a lateral offset labeled a is also illustrated in FIG. 3 , as between spray heads 46 , 48 .
- a longitudinal offset labeled b is also illustrated in FIG. 3 .
- the values of offsets a and b may be adjusted in accordance with user desires.
- FIGS. 4, 5 , and 6 in the drawings here there are shown three additionally modified manners of practicing the invention, especially with respect to the way in which dry liquid-imbiber beads are fed to spray head 48 .
- FIG. 4 what is pictured here is the possibility of using a compressed air option for aiding in the gravity feed of liquid-imbiber beads from block 38 to spray head 48 .
- FIG. 5 what is pictured are two other liquid-imbiber bead feeding options, one of which implements the activity of an impeller pump 52 between block 38 , 48 , and the other of which suggests the use of a compressed air assist, either at the location directly of the mentioned impeller pump, or just downstream from that pump.
- Use of impeller pump 52 to drive a flow of liquid-imbiber beads is referred to herein as impeller-pump driving.
- an auger drive 54 is shown as a bead-feed option. This drive in disposed intermediate blocks 38 , 48 .
- two possible compressed air assist options are also illustrated as being selectable.
- the present invention proposes a unique method for spray-creating a composite-material layer useable in a plural-layer coating which is to be applied to the outside surface of a liquid container to defeat liquid leakage following a projectile penetration of the container, utilizing, in the creation of such a layer, a blend of first and second, penetration-reaction materials including, as a first penetration-reaction material, a high-elastomeric body-forming material, and as a second penetration-reaction material, liquid-imbibing bead-like elements.
- the method includes the steps of (a) defining a desired-by-weight final percentage blend of these two materials, where the weight contribution of the first material is the larger-percentage contributor to the final composite-material layer, and (b) creating side-by-side, differentiated, simultaneous sprays of the two materials to be blended en route toward the region of a target liquid container, with the flow rate of the first penetration-reaction material being adjusted during spraying to be greater than that of the second penetration-reaction material by an amount designed to achieve the desired, final, percentage-by-weight sprayed-layer blend.
- Several alternative approaches are described and illustrated for developing a flow of the liquid-imbibing bead-like elements.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
Abstract
A method for spray-creating a composite-material layer useable in a plural-layer coating applied to the outside surface of a liquid container to defeat liquid leakage from that container following a projectile penetration of the container, and utilizing in the creation of such a layer a blend of first and second, penetration-reaction materials including, as a first penetration-reaction material, a high-elastomeric body-forming material, and as a second penetration-reaction material, liquid-imbibing bead-like elements. The method includes (a) defining a desired-by-weight final percentage blend of these two materials, where the weight contribution of the mentioned first material is the larger-percentage contributor to the final composite-material layer, and (b) creating side-by-side, differentiated, simultaneous sprays of the two materials to be blended in air en route toward the region of a target liquid container, with the flow rate of the first material being adjusted, relative to that of the second material, to be the greater by-weight flow rate so as to achieve the desired, final, percentage-by-weight, sprayed-layer blend.
Description
- This application claims appropriate respective priorities to two currently pending, prior-filed, U.S. Provisional Patent Applications whose disclosure contents are hereby incorporated herein by reference. One of these predecessor cases bears Ser. No. 60/678,000, and was filed May 3, 2005, for “Barrier Coating Application Method”. The other predecessor case bears Ser. No. 60/684,245, and was filed May 24, 2005 for “Application of Plural-Component, Self-Healing, Anti-Puncture Liquid Container Coating”.
- In currently pending, Regular U.S. patent application Ser. No. 11/067,525, filed Feb. 25, 2005 for “Projectile Barrier and Method”, a special kind of leakage-defeating protective coating for a liquid container is illustrated and described. The content of this prior-filed regular U.S. patent application is hereby incorporated herein by reference for background information purposes.
- Fundamentally, that prior-filed Regular U.S. patent application describes a unique, plural-layer, anti-leakage protective coating which may be applied to the surface of a metallic liquid container, such as to the surface of a metal (steel or aluminum) tank holding hydrocarbon fuel. In the described layer structure of this coating, two different kinds of layers are disclosed and discussed, one of which is formed substantially purely of a high-elastomeric material, and the other of which is a composite material formed of the same high-elastomeric material just mentioned in which there additionally resides a distribution of liquid-imbiber bead-like elements, or beads. Both of these materials are referred to herein as penetration-reaction materials. The high-elastomeric material is referred to also as a body-forming material.
- The present invention concerns itself principally with a spray-application manner for creating the second-mentioned one of these two types of layers, namely, for creating the composite-material layer which includes both an elastomeric body, and a distribution therein of liquid-imbiber beads.
- According to a preferred practice of the invention, the desired composite-material layer is formed by merging in air, as what is referred to herein as a sprayed-layer blend, and just before application to a target surface on a target liquid container, i.e., en route to that surface) of two independently sprayed streams of material, one of which sprays contains wet, liquid, high-elastomeric material, and the other of which includes dry, liquid-imbiber beads.
- As will be learned from the detailed description below, and in relation to the specific, illustrative, composite-material layer shown and described herein, when this detailed description is read along with the accompanying drawings, pre-spray flows of these two kinds of materials are appropriately adjusted relative to one another to end up producing a desired composite-material layer wherein, in the final layer, the sprayed high-elastomeric material accounts for about 78-percent by weight of the layer, and the imbedded, distributed liquid-imbiber beads account for about 22-percent by weight of the final layer.
- Additionally, and in accordance with practice of the invention, a user is offered the option of adjusting, differentially, the relative positions of two spray heads which are employed to create, selectively, different characters of air-blended sprays of the two different layer-forming materials. This position adjustability feature allows for both changing the lateral separation between these two spray heads, one for each of the two materials, and also for allowing what is referred to herein as relative longitudinal adjustment so as to position one spray head or the other closer to or further away from an intended target surface where layer formation is to take place. This control adjustability allows a user a relatively wide range of options for composite-material layer formation. It does so by varying the length of time that initially dry liquid-imbiber beads are in contact with still-uncured still-liquid elastomeric material.
- Further included in the invention methodology are several proposed and different modalities for delivering the liquid imbiber beads to the associated spray instrumentality (head) which creates a spray of these beads. Included in these modalities, as will seen, are gravity, impeller-pump feed, auger-drive feed, and compressed-air assistance where desired.
- Various other features and advantages that are offered by the present invention will now become more fully apparent as the detailed description of the invention which follows is read in conjunction with the accompanying drawings.
-
FIG. 1 is a simplified, fragmentary cross-sectional view of a portion of a metallic liquid container whose outside surface has been coated with a plural-layer, anti-leakage barrier structure including a central, composite-material layer which has been formed in accordance with practice of the present invention. -
FIG. 2 is a simplified, block/schematic diagram of the basic architecture of the system and methodology of the present invention. -
FIG. 3 is somewhat likeFIG. 2 , except that it provides a more detailed block/schematic view of the make up of the present invention. -
FIGS. 4, 5 , and 6 are relatable to what is shown on the right side ofFIG. 3 with respect to illustrating several different manners/modalities of supplying a spray-implementable flow of liquid-imbiber beads which form part of the composite-material layer that is created by the present invention. - Turning now to the drawings, and referring first of all to
FIG. 1 , indicated generally at 10 is a three-layer, anti-leak barriercoating including layers wall 18 b in a metallicliquid container 18. For the purpose of illustration of the invention herein, it will be assumed thatcontainer 18 is a hydrocarbon fuel tank in a military fuel tanker vehicle (not shown)—a setting wherein the present invention has been found to offer particular utility. - In the specific barrier coating illustrated in
FIG. 1 ,layers Layer 14, which liesintermediate layers - Further describing what is shown in
FIG. 1 , in the illustrated and generally describedbarrier coating 10,layers layers - This same high-elastomeric material, for illustration purposes herein, is the material which forms
body 14 a inlayer 14. The liquid imbiber beads distributed inlayer 14 are formed herein of the material known as IMB230300, made by Imbibitive Technologies America, Inc. in Midland, Mich.Layer 14, very specifically, is the layer which is formed specifically in accordance with the features and practice of the present invention. In barrier coating 10 herein as illustrated, this layer has a thickness of about ⅛-inches. - Those skilled in the art should recognized that, while certain specific high-elastomeric and bead-like materials have been chosen as penetration-reaction materials for illustration of the present invention, and while a three-layer barrier coating having the layer thicknesses mentioned above has also been selected for illustration purposes, various other useful materials may be employed in the practice of the invention, and different layer counts and layer thicknesses may also be chosen for different specific applications.
- With respect to spray application and creation of the several barrier-coating layers that are associated with implementation and practice of this invention, a word here about the use of a “receiving-surface” primer for layer adhesion assistance will be useful.
- Where the receiving surface is either metal, or painted metal, that surface should be completely dry before primer application. For an unpainted metal surface, normally no special surface texturing is necessary before primer application. However, where painted metal is involved, paint-surface profiling to produce about a 1- to about a 3-mil texture is recommended.
- To such a surface, an appropriate primer, such as the so-called System 251 primer made by Rhino Linings, USA, Inc. (mentioned above herein), may be used. This primer preferably is applied to create a primer layer having a thickness lying in the range of about 2- to about 5-mils. Manufacturer's instructions are entirely adequate to describe both the details of applying this primer to different surfaces, and the conditions which, after primer application, should be observed to indicate readiness of the primer to receive a sprayed overlayer, such as the innermost elastomeric layer discussed herein which lies closest to the outer surface of a protected liquid container.
- After application of this innermost elastomeric layer, and with regard to the recommended use or non-use of such a primer in an interlayer manner as successive barrier-coating layers, such as
layers - Where the receiving surface for the innermost, barrier-coating elastomeric layer is the outer surface of a plastic container, such as the outer surface of an HDPE fuel tank in a military vehicle, two things preferably should be done to prepare such a surface for elastomeric layer receipt. First, the surface should be scrubbed/scuffed, as with a rotary wire cup brush, to roughen the surface, and to remove any “surface gloss” of this surface. Next, an appropriate adhesion-promoting primer should be sprayed onto the scuffed surface. A suitable primer is the two-part catalyzed product known as DPX-801 plastic adhesive primer made by PPG Industries of Strongsville, Ohio.
- Interlayer primer use here should be based upon the same time-interval consideration just discussed above, and an appropriate interlayer primer is the mentioned System 251 primer.
- Returning to the main description of the present invention, as was mentioned above, the present invention focuses upon methodology specifically for creating, in a spray-application manner, composite-
material layer 14. - Turning to
FIG. 2 in the drawings, here there is illustrated, at a relatively high schematic level, an overall “picture” of the architecture and practice of the present invention. This practice is illustrated inFIG. 2 with fourblocks FIG. 2 by labeled arrowheads. According to the high-level illustration presented inFIG. 2 , the present invention focuses on the spray formation of a composite-material layer, likelayer 14, by creating two independent sprays of materials which are directed through independent spray heads, 28, 30 toward a target surface, such as the exposed surface of high-elastomeric layer 12. This is done in a fashion whereby the sprays emanating from these spray heads, by the time they arrive at the target surface, will have fully overlapped and merged to become united as a single-application spray. - In
FIG. 2 , the spray directed fromspray head 28 is a spray of wet, two-part blended, liquid high-elastomeric material coming, in accordance with what is shown inFIG. 2 , fromblock 20 wherein it is referred to as Part A. At this point in the process of the invention, Part A is a combination, or blend, of the two components which need to be brought together to create a resulting, catalyzable, high-elastomeric material. Flow rate from the supply of this elastomeric material is controlled in any suitable fashion, as is represented very generally byblock 22 inFIG. 2 . - Simultaneously, dry liquid-imbiber elements, or beads represented by
block 24, and referred to inFIG. 2 as Part B, are directed ultimately for spraying byspray head 30 through ablock 26 which represents any suitable form of flow-rate control for these beads. - According to practice of the invention, appropriate flow-rate controls for the two flows of the two materials are implemented in
blocks FIG. 2 , a merging and mingling blend of the wet, liquid elastomeric material and beads in a ratio determined to be the desired-by-weight final composition of the resulting spray-created composite-material layer. In the illustration of the invention now being detailed herein, this matter of flow-rate adjustment is performed in such a fashion that the resulting spray-applied composite layer will be represented about 22-percent by weight of the imbiber beads. - Not specifically illustrated in
FIG. 2 , but to be understood as being an important option offered in accordance with practice of the present invention, and to be more fully described shortly, is the fact that the relative positions of spray heads 28, 30, both laterally, and longitudinally (i.e., in a direction toward and away from a target surface) may be adjusted so as to provide a user with a relatively wide range of “fine tuning” control over the nature of the finally created, spray-applied, composite-material layer. - For example, by shifting the relative position of
spray head 28 in a longitudinal sense, the length of time that the now curing, but still liquid, elastomeric material spends en route from the associated spray head to the target surface can be varied in a manner which thereby determines the state of curing of this material at the point in time when it strikes the target surface. By adjusting the relative lateral positions of the two spray heads, and to some extent by also controlling and adjusting the relative longitudinal positions of these two spray heads, the amount of time that the initially dry liquid-imbiber beads spend contactively engaged with still wet liquid elastomeric material may be controlled. This area of control plays a role in the manner in which, in the finally created composite layer, the liquid-imbiber beads function as liquid absorbers and three-dimensional swellers—two of the important mechanisms provided by these elements in defeating a puncture-produced leakage wound in a container, such as incontainer 18. This same set of relative adjustments that may be made between and in regard to the two spray heads, also plays a role in determining, to some extent, the manners in which the included liquid-imbiber beads in the final layer perform a coagulating response to leakage liquid—one of the other mechanisms employed inbarrier coating 10 to close off a leakage wound. -
FIG. 3 in the drawings is very much likeFIG. 2 , except that it illustrates the broadly presented practice seen inFIG. 2 in slightly greater detail. Eight blocks, 34, 36, 38, 40, 42, 44, 46, 48 are used inFIG. 3 to provide this more detailed view of practice of the invention.Blocks downstream block 44 inFIG. 3 , generally relate to block 20 inFIG. 2 , withblocks FIG. 3 generally relating to block 22 inFIG. 2 . Here what one sees is how the two precursor components of the above-mentioned elastomeric material are control-pumped to a region illustrated schematically byblock 44 for mixing, and then on to spraying through a spray head represented by ablock 46 inFIG. 3 .Block 46 inFIG. 3 is related toarrowhead 28 inFIG. 2 . Pumping performed byblocks -
Block 38 inFIG. 3 relates to block 24 inFIG. 2 regarding a supply of liquid-imbiber beads. Aline 50 inFIG. 3 which connectsblock 38 withspray head 48, illustrated schematically an action of controlled gravity feed of beads fromblock 38 to block 48. This line represents flow-rate control as implemented byblock 26 inFIG. 2 . - Thus what is shown in
FIG. 3 presents one particular way of implementing the practice of the present invention for the creation of a pair of air-blended sprays of liquid elastomeric material and dry, liquid-imbiber bead material, controlled in a fashion to yield a final composite-material layer, likelayer 14, having the desired content of these two ingredients. In this figure, liquid elastomeric material is fed under positive pumping control, and liquid-imbiber beads are fed under controlled gravity-feed conditions. - At the left side of
FIG. 3 , an arrow which is marked “Air Option”, and which relates, through the bracket touched by this arrow, to the operation of the supply of liquid elastomeric material, is presented inFIG. 3 to provide recognition that one option useable in conjunction with what is otherwise shown inFIG. 3 is the use of pressurized air at one or more appropriate locations to propel the delivery of liquid elastomeric material. - Also illustrated in
FIG. 3 , as between spray heads 46, 48, is a lateral offset labeled a and a longitudinal offset labeled b. In order to offer the kinds of spray-blending control possibilities suggested earlier herein, one will recognize that the values of offsets a and b may be adjusted in accordance with user desires. - Turning now finally to
FIGS. 4, 5 , and 6 in the drawings, here there are shown three additionally modified manners of practicing the invention, especially with respect to the way in which dry liquid-imbiber beads are fed to sprayhead 48. - In
FIG. 4 what is pictured here is the possibility of using a compressed air option for aiding in the gravity feed of liquid-imbiber beads fromblock 38 to sprayhead 48. - In
FIG. 5 , what is pictured are two other liquid-imbiber bead feeding options, one of which implements the activity of animpeller pump 52 betweenblock impeller pump 52 to drive a flow of liquid-imbiber beads is referred to herein as impeller-pump driving. - In
FIG. 6 , anauger drive 54 is shown as a bead-feed option. This drive in disposedintermediate blocks - With respect to the various options shown in
FIGS. 4, 5 , and 6, those skilled in the art will recognize that there are many specific ways and devices for implementing these options, knowledge about which is well within the understandings and skill levels of those generally skilled in the art. Accordingly, the details of these options, which do not form any part of the present invention, are not laid out in the text herein. - Thus, the present invention proposes a unique method for spray-creating a composite-material layer useable in a plural-layer coating which is to be applied to the outside surface of a liquid container to defeat liquid leakage following a projectile penetration of the container, utilizing, in the creation of such a layer, a blend of first and second, penetration-reaction materials including, as a first penetration-reaction material, a high-elastomeric body-forming material, and as a second penetration-reaction material, liquid-imbibing bead-like elements. The method includes the steps of (a) defining a desired-by-weight final percentage blend of these two materials, where the weight contribution of the first material is the larger-percentage contributor to the final composite-material layer, and (b) creating side-by-side, differentiated, simultaneous sprays of the two materials to be blended en route toward the region of a target liquid container, with the flow rate of the first penetration-reaction material being adjusted during spraying to be greater than that of the second penetration-reaction material by an amount designed to achieve the desired, final, percentage-by-weight sprayed-layer blend. Several alternative approaches are described and illustrated for developing a flow of the liquid-imbibing bead-like elements.
- Accordingly, while a preferred and best mode manner for practicing the present invention to create the type of composite-material barrier-coating layer described herein has been specifically set forth in this disclosure, and while several variations have also been suggested, it is appreciated that, in the hands of those who are skilled in the art, other variations and modifications may be made without departing from the spirit of the invention, and it is intended that all such variations and modifications be treated as coming within the scope of the claims to invention which now follow.
Claims (9)
1. A method for spray-creating a composite-material layer useable in a plural-layer coating applied to the outside surface of a liquid container to defeat liquid leakage from that container following a projectile penetration of the container, and utilizing in the creation of such a layer a desired-by-weight blend of first and second, penetration-reaction materials including, as a first penetration-reaction material, a high-elastomeric body-forming material, and as a second penetration-reaction material, liquid-imbibing bead-like elements, said method including the steps of
defining a desired-by-weight final percentage blend of these two materials, where the weight contribution of the first-mentioned penetration-reaction material is the larger-percentage contributor to the final composite-material layer, and
creating side-by-side, differentiated, simultaneous sprays of these two materials to be contact-blended into a composite spray en route in the air toward the region of a target liquid container, with the by-weight flow rate of the first-mentioned penetration-reaction material, during spraying, being adjusted to be greater than that of the second-mentioned penetration-reaction material by an amount designed to achieve the desired, final, percentage-by-weight sprayed-layer blend.
2. The method of claim 1 , wherein said creating of simultaneous sprays of the mentioned two penetration-reaction materials takes place through the operations of a pair of side-by-side spray instrumentalities, and which further includes offering a user the option to vary independently both the lateral and the longitudinal separations between these two spray instrumentalities, whereby the amount of en route contact blend time between the two penetration-reaction materials may be selectively varied.
3. The method of claim 1 , wherein the high-elastomeric material is a wet liquid material, and the bead-like elements are formed of a dry material.
4. The method of claim 1 , wherein, upstream from where spraying takes place, the mentioned bead-like elements are gravity-supplied for ultimate spraying.
5. The method of claim 1 , wherein, upstream from where spraying takes place, the mentioned bead-like elements are supplied for spraying in a pressurized-air, gravity-feed manner.
6. The method of claim 1 , wherein, upstream from where spraying takes place, the bead-like elements are supplied for spraying utilizing a combination of gravity feed and impeller-pump drive.
7. The method of claim 6 which further includes, with respect to the manner of supplying the bead-like elements for spraying, providing pressurized air assist in relation to the operation of impeller-pump driving.
8. The method of claim 1 , wherein, upstream from where spraying takes place, the bead-like elements are supplied for spraying via combined gravity and auger-drive feeding manners.
9. The method of claim 8 which further includes providing an air assistance option useable in conjunction with the mentioned auger-drive feeding activity.
Priority Applications (2)
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US12/380,344 US8389063B2 (en) | 2005-05-03 | 2009-02-25 | Barrier-coating layer application method |
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US68424605P | 2005-05-24 | 2005-05-24 | |
US11/412,461 US20060257665A1 (en) | 2005-05-03 | 2006-04-26 | Barrier-coating layer application method |
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US12/380,344 Active 2026-11-15 US8389063B2 (en) | 2005-05-03 | 2009-02-25 | Barrier-coating layer application method |
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US9150737B2 (en) * | 2010-12-10 | 2015-10-06 | Polyguard Products, Inc. | Composition and methods for providing coatings; materials; application techniques; and, resulting coated substrates |
US8865315B2 (en) * | 2011-12-20 | 2014-10-21 | Huntsman International Llc | Self healing coating system for use with fuel tanks |
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Also Published As
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WO2006119007A2 (en) | 2006-11-09 |
US8389063B2 (en) | 2013-03-05 |
US20090169757A1 (en) | 2009-07-02 |
WO2006119007A3 (en) | 2007-09-20 |
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