WO2012115634A1 - Joint d'étanchéité de moulage en place pour tamis à secousses - Google Patents

Joint d'étanchéité de moulage en place pour tamis à secousses Download PDF

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Publication number
WO2012115634A1
WO2012115634A1 PCT/US2011/025874 US2011025874W WO2012115634A1 WO 2012115634 A1 WO2012115634 A1 WO 2012115634A1 US 2011025874 W US2011025874 W US 2011025874W WO 2012115634 A1 WO2012115634 A1 WO 2012115634A1
Authority
WO
WIPO (PCT)
Prior art keywords
gasket
extruded
screen frame
metal
mastic
Prior art date
Application number
PCT/US2011/025874
Other languages
English (en)
Inventor
Barry R. Spigener
James D. Gillhespy
Scott J. Carmichael
Original Assignee
Michigan Adhesive Manufacturing, Inc.
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 Michigan Adhesive Manufacturing, Inc. filed Critical Michigan Adhesive Manufacturing, Inc.
Priority to PCT/US2011/025874 priority Critical patent/WO2012115634A1/fr
Publication of WO2012115634A1 publication Critical patent/WO2012115634A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes

Definitions

  • This invention pertains to the field of vibratory separators and shale shakers, and more particularly to seals or gaskets for screen assemblies used on vibrating separators.
  • Vibrating screens have been employed for many years to separate particles in a wide variety of industrial applications.
  • Common applications for vibrating screens include drilling operations to separate particles suspended in drilling fluids.
  • the screens are mounted generally horizontally on a vibrating mechanism or shaker that imparts a desired motion to the screen.
  • Material from which particles are to be separated is poured onto a back end of the vibrating screens, usually from a pan mounted above the screens. The material generally flows toward the end of the screens. Large particles are unable to move through the screens remaining on top of the screens and moving toward the front of the screens where they are collected. The smaller particles and fluid flow through the screens and collects in a tank, receptacle or pan beneath the screens.
  • the vibrating screens are resiliently suspended or mounted upon a support and are caused to vibrate by a vibrating mechanism, e.g., an unbalanced weight on a rotating shaft connected to a basket or frame.
  • the screens are vibrated by vibratory equipment to create a flow of trapped solids on top surfaces of the screens, typically for removal and disposal of the solids.
  • the fineness or coarseness of the mesh of a screen may vary depending upon mud flow rate and the size of the solids to be removed.
  • the gaskets or seal members used on vibratory separators are typically located at the interface of a screen frame and vibratory separator housing members, and/or between adjacent screen frames.
  • the gaskets are typically made of a resilient material that performs a sealing function to prevent materials being processed from bypassing the mesh screens, such as by flowing around the outside of the screened frame.
  • gaskets or seal members have generally been prefabricated separately from the screen frames, and have been subsequently secured to the screen frames with an adhesive material, a friction or interference fit, mechanical fasteners, or a combination of these means.
  • a gasket or seal member may be integrally molded with a composite screen frame by positioning the screen frame within a mould tool, and using an injection moulding technique to form the gasket on a surface of the screen frame within the mould tool.
  • the invention is directed to a form-in-place technique in which a gasket is formed directly on a surface of a screen frame to be used in a vibratory separator by depositing a material onto a surface of the screen frame to form a continuous strip of the material along the surface of the screen frame, and curing the material to form the gasket.
  • An advantage of certain embodiments of the invention is that the material deposited on the screen frame bonds directly with the surface of the screen frame, eliminating the need for using a separate adhesive or mechanical fasteners to secure the gasket to the screen frame.
  • FIG. 1 is a top view of a screen frame on which is deposited a bead of material to form a gasket in accordance with the invention.
  • the invention provides an improved method for establishing a suitable seal between screen frames and/or a screen frame and vibratory housing members.
  • the process involves forming a gasket 12 on surfaces of the screen frame 14 by depositing a suitable material directly onto the surface of the frame, generally along perimeter surfaces of the frame.
  • the method of the invention provides improved adhesion between a screen frame and a gasket, and eliminates the need for adhesives and/or fasteners for attaching the gasket to the screen frame.
  • Other advantages of the invention include extended service life, the ability to repair onsite, and a reduced need for inventory of different types of gaskets.
  • the term "depositing" and variations thereof refer to any suitable technique for disposing a flowable material on the surface of a screen frame so that it can be cured (e.g., cross-linked or otherwise hardened or solidified) in place on the screen frame.
  • suitable techniques for depositing a curable material on a screen frame include spraying, brushing, and troweling.
  • a preferred technique for depositing a curable material in accordance with certain aspects of the invention involves extruding the curable material onto a surface of a screen frame.
  • the term "extruding" and variations thereof refer to a process used to form gaskets or seal members having a substantially fixed or constant cross-sectional profile by forcing an extrudable material through a die having a desired cross-sectional shape and size, wherein the extrudable material does not flow appreciably merely under the influence of gravity, but will flow when forced through the die opening.
  • Suitable extrudable materials typically have a viscosity of from about 10,000 pascal-seconds to about 30,000 pascal-seconds.
  • viscosity materials may be employed provided that the viscosity is not so low as to allow excessive flow under only the influence of gravity that prevents formation of a useable gasket, and is not so high as to make extrusion through a die impractical.
  • curing and variations thereof refer to a process used to harden and/or solidify a deposited material.
  • curing encompasses various techniques for cross-linking polymer(s), pre-polymer(s), and/or oligomer(s) to form a cross-linked network or thermoset material.
  • Such techniques may involve the use of chemical additives (e.g., cross-linking agents, cross-linking catalysts, cross-linking initiators, etc.), heat, moisture or humidity (e.g., cross-linking by a combination of hydrolysis and/or condensation reactions), and/or radiation (e.g., ultraviolet radiation, electron beam radiation, etc.).
  • chemical additives e.g., cross-linking agents, cross-linking catalysts, cross-linking initiators, etc.
  • heat, moisture or humidity e.g., cross-linking by a combination of hydrolysis and/or condensation reactions
  • radiation e.g., ultraviolet radiation, electron beam radiation, etc.
  • the term "curing” may also be used to encompass other types of processes in which a deposited material is hardened and/or solidified, such as by fusion of a thermoplastic material that is deposited in a molten or semi-molten state.
  • thermosettable compositions include those that are formulated to cure rapidly upon exposure to heat and/or moisture. In such cases, curing can be affected or accelerated by subjecting the extruded materials to elevated moisture levels and/or elevated temperatures immediately after (and possibly during) extrusion.
  • the gasket that is formed in-place in accordance with this invention has appropriate elastomeric properties and sufficient toughness to withstand the vibration, movement and extremely variable pressures to which it will be subjected when used in a vibratory separation process and apparatus.
  • the diameter of a gasket material having a circular cross-sectional shape or the largest cross-sectional dimension of a gasket material having a non-circular cross-sectional shape is typically from about 0.5 inch to about 0.75 inch. However, in certain cases larger or smaller dimensions may be desirable.
  • the material that is deposited in accordance with certain aspects of this invention is a thermosettable polymeric material that can be thermoset to form a gasket material that will adhere tenaciously to a metal surface (e.g., steel, aluminum, brass, etc.), a painted metal surface, an electrophoretically coated metal surface, a galvanized metal (e.g., steel or iron) and/or a powder coated metal surface of a screen frame for use in a vibratory separator.
  • a metal surface e.g., steel, aluminum, brass, etc.
  • a painted metal surface e.g., an electrophoretically coated metal surface
  • a galvanized metal e.g., steel or iron
  • a powder coated metal surface of a screen frame for use in a vibratory separator.
  • the deposited material is sufficiently gelled and substantially tack free immediately after or shortly after being extruded so as to allow packaging and stacking of the screen frames on which the material has been extruded without adversely affecting the functionality of the gasket ultimately formed upon substantially complete curing of the extruded material.
  • Thermosettable compositions that may be used in practicing the invention include one-part and two-part systems.
  • a two-part system refers to one in which certain components of a thermosettable composition are isolated from other components until immediately before the composition is used.
  • the prepolymer, polymer, and/or oligomers are typically in one part, and a second part includes cross-linking initiators.
  • a preferred one-part system comprises a moisture curable composition containing a silyl-terminated polyether.
  • the deposited material is capable of achieving a Shore A
  • Substantially fully cured means that the composition is substantially inert and/or that the polymers, pre- polymers and/or oligomers will not undergo any significant further polymerization or cross-linking, and/or that the physical properties of the material will not further change appreciably over time.
  • the gasket material upon becoming substantially fully cured, will undergo cohesive failure rather than adhesive failure when tested to failure (e.g., peel testing), and will have a service life that exceeds the service life of the mesh screen mounted on the screen frame.
  • it is desirable that the fully cured gasket have a minimum service temperature of 230° F, and that the deposited material can be applied at generally any temperature from ambient or room temperature (about 70° F) to about 250° F.
  • the cured gasket exhibit exceptional chemical resistance and heat resistance.
  • the gasket material is selected to provide sufficient chemical resistance to avoid degradation upon persistent contact with diesel fuel during its service life.
  • Suitable extrudable, curable compositions that may be employed in accordance with certain aspects of this invention include polyurethane systems, stryrenic block copolymer systems, silyl-terminated polyether mastic compositions, polyurethane mastic compositions, silyl-terminated polyurethane compositions and compositions containing hybrid end-capped silonol-terminated polymers.
  • a polyurethane mastic is produced by reacting a polytetramethylene ether glycol with crude methylene diphenyl diisocyanate, in the appropriate isocyante:hydroxyl ratio to produce a pre-polymer having an NCO content of less than 4%.
  • an antioxidant such as Irganox 1135 should be added to the final blend.
  • the final blend is used for extruding a gasket onto a surface of a screen frame used in a vibratory separator.
  • a solvent cast elastomer is made from a solid portion dissolved in a solvent.
  • the solid portion comprises 100 parts Kraton G1652, 20-30 parts poly-alpha-methyl styrene resin, such as Endex 155 or 160, 10-40 parts of a hydrocarbon resin such as Escorez 5300, and 0.1-3 parts of an anti-oxidant such as Irganox 1010.
  • the solid portion should be dissolved into a solvent at a 10-45% w/w ratio of solid to the solvent.
  • the solvent portion is made up of 35% by weight of toluene, 35% by weight of xylene, and 30%) by weight of tert-butyl acetate.
  • the solvent cast elastomer is used for extruding a gasket onto a surface of a screen frame used in a vibratory separator.
  • a silyl-poly ether mastic is made from 25-30 parts trimethoxysilylpropylcarbamate terminated polyether and 5-10 parts of a low modulus silyl polyether such as S203H, 10- 20 parts diisodecyl phthalate plasticizer, 1-2 parts water scavenger, such as Geniosil XL 10, 2-5 parts fumed silica, 40-50 parts calcium carbonate; 1-5 parts titanium dioxide, 0.1-2 parts hindered amine light stabilizer; 1-2 parts organofuctional silane; 0.05-0.5 aminosilane, 0.05-0.5 parts dibutyltindilaurate.
  • the mastic is used for extruding a gasket onto a surface of a screen frame used in a vibratory separator.
  • a mastic is made from 20-30 parts of a silyl-terminated polyurethane pre -polymer, such as Desmoseal S XP 2636; 10-20 parts plasticizer such as Unimol BB; 40-60 parts filler such as calcium carbonate; 1-3 parts fumed silica such as Cabosil PTG, and 0.1-0.5 parts condensation catalyst such as DABCO T-12.
  • the mastic is used for extruding a gasket onto a surface of a screen frame used in a vibratory separator.
  • An advantage of the invention is that a single extrusion apparatus or other deposition technique can be easily used for quickly forming gaskets directly on a variety of different screen frames, having different sizes and different shapes, and/or a variety of screen frames requiring gaskets having different profiles (cross-sectional shapes) or different cross-sectional dimensions. Such modifications can be quickly made to an extrusion apparatus by changing the die or extrusion head of the apparatus. Such flexibility eliminates the need for maintaining an inventory comprised of a large variety of different pre-formed gaskets.
  • the invention also enables emergency repairs onsite, as needed, employing handheld applicators.
  • the invention is expected to be particularly useful for shale shaker operations at gas and/or oil wells
  • other possible applications include use of the invention for vibratory separators employed in the petrochemical, mining, food processing, polymer, pharmaceutical, ceramic, paper and pulp, and abrasives industries.
  • the methods of the invention have potential application and advantages in any industry using screens or sieves in a vibratory apparatus for separating or sorting particles from muds, suspensions, slurries, or a mixture of different size particles.

Landscapes

  • Gasket Seals (AREA)
  • Sealing Material Composition (AREA)

Abstract

L'invention porte sur une technique de moulage en place pour appliquer un joint d'étanchéité directement sur une surface d'un cadre de tamis utilisé dans un séparateur vibratoire. Le procédé comprend une étape consistant à déposer un matériau sur une surface du cadre de tamis pour former une bande continue du matériau le long de la surface du cadre de tamis, et à faire durcir le matériau pour former le joint d'étanchéité.
PCT/US2011/025874 2011-02-23 2011-02-23 Joint d'étanchéité de moulage en place pour tamis à secousses WO2012115634A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2011/025874 WO2012115634A1 (fr) 2011-02-23 2011-02-23 Joint d'étanchéité de moulage en place pour tamis à secousses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2011/025874 WO2012115634A1 (fr) 2011-02-23 2011-02-23 Joint d'étanchéité de moulage en place pour tamis à secousses

Publications (1)

Publication Number Publication Date
WO2012115634A1 true WO2012115634A1 (fr) 2012-08-30

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ID=46721153

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2011/025874 WO2012115634A1 (fr) 2011-02-23 2011-02-23 Joint d'étanchéité de moulage en place pour tamis à secousses

Country Status (1)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0631247A (ja) * 1992-07-18 1994-02-08 Murozumi:Kk 振動篩用スクリーン
JP2001259527A (ja) * 2000-03-22 2001-09-25 Mitsuboshi Belting Ltd 二層構造スクリーンとこれを用いた振動篩機
WO2006124815A1 (fr) * 2005-05-13 2006-11-23 M-I L.L.C. Structure de tamis composite a double indice de durete
US20070227954A1 (en) * 2006-03-30 2007-10-04 M-I Llc Composite screen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0631247A (ja) * 1992-07-18 1994-02-08 Murozumi:Kk 振動篩用スクリーン
JP2001259527A (ja) * 2000-03-22 2001-09-25 Mitsuboshi Belting Ltd 二層構造スクリーンとこれを用いた振動篩機
WO2006124815A1 (fr) * 2005-05-13 2006-11-23 M-I L.L.C. Structure de tamis composite a double indice de durete
US20070227954A1 (en) * 2006-03-30 2007-10-04 M-I Llc Composite screen

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