WO2022219483A1 - Système de confinement cellulaire - Google Patents

Système de confinement cellulaire Download PDF

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Publication number
WO2022219483A1
WO2022219483A1 PCT/IB2022/053339 IB2022053339W WO2022219483A1 WO 2022219483 A1 WO2022219483 A1 WO 2022219483A1 IB 2022053339 W IB2022053339 W IB 2022053339W WO 2022219483 A1 WO2022219483 A1 WO 2022219483A1
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WO
WIPO (PCT)
Prior art keywords
ccs
polyethylene
terpolymers
ethylene copolymer
coating
Prior art date
Application number
PCT/IB2022/053339
Other languages
English (en)
Inventor
Izhar Halahmi
Oded Erez
Original Assignee
P.R.S Geo Tech Technologies Ltd
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 P.R.S Geo Tech Technologies Ltd filed Critical P.R.S Geo Tech Technologies Ltd
Priority to EP22787727.1A priority Critical patent/EP4323589A1/fr
Priority to CN202280040729.4A priority patent/CN117480300A/zh
Publication of WO2022219483A1 publication Critical patent/WO2022219483A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D28/00—Producing nets or the like, e.g. meshes, lattices
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/05—Interconnection of layers the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E02D17/202—Securing of slopes or inclines with flexible securing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0641—MDPE, i.e. medium density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating

Definitions

  • Embodiments of the invention relate to a cellular confinement system, and in particular to cellular confinement system with improved durability.
  • BACKGROUND [002] Cellular confinement systems, also known as a CCS or geocells are used as structural reinforcement for load support e.g. in earth retention for supporting loads.
  • a cellular confinement system (CCS) is an array of containment cells resembling a “honeycomb” structure that is filled with granular infill, which can be cohesionless soil, sand, gravel, ballast, crushed stone, or any other type of granular aggregate, including different minerals, recycled concrete, recycled asphalt.
  • CCSs are mainly used in various civil engineering applications involving granular infill.
  • CCSs differ from other geosynthetics such as geogrids or geotextiles in that geogrids/geotextiles are flat (i.e., two-dimensional) and used as planar reinforcement.
  • Geogrids/geotextiles provide confinement only for very limited vertical distances (usually 1-2 times the average size of the granular material) and are limited to granular materials having an average size of greater than about 20 mm.
  • CCSs are three-dimensional structures that provide confinement in all directions (e.g. along the entire cross-section of each cell).
  • the multi-cell geometry provides passive resistance that increases the bearing capacity.
  • a geocell provides confinement and reinforcement to granular materials having an average particle size less than about 20 mm, and in some cases materials having an average particle size of about 10 mm or less.
  • Geocells are traditionally made of polyolefin resins, such as polyethylene (PE).
  • PE polyethylene
  • the polyethylene (PE) can be high density polyethylene (HDPE) or medium density polyethylene (MDPE).
  • HDPE refers hereinafter to a polyethylene characterized by density of greater than 0.940 g/cm ⁇ 3.
  • MDPE medium density polyethylene
  • MDPE low density polyethylene
  • LOPE low density polyethylene
  • a geocell made of HDPE or MDPE for example may have a cell wall thickness of 1-1.5 millimeters, an average diameter (when infilled with granular material) of 230 millimeters, a height of up to 200 millimeters.
  • Geocell, or cellular confinement systems are manufactured from plastic strips, usually polyethylene, welded together by ultrasonic welding. In order to qualify geocell manufacturing, strip tensile strength, seam welding shear strength, seam welding split strength and seam welding peel strength (all ultimate failure values, not long term strength values), creep resistance and dynamic mechanical properties are measured.
  • the measured values for seams welding strength fail to predict geocell lifetime, especially when it is exposed to organic or inorganic low molecular weight compounds , for examples acids, salts , oils, detergents , fats, soap , solvents and diluents ,distillates and organic waste that is common in mineral mining, landfills and swamps.
  • the root cause for premature seam welding failure in certain cases may be the development of cracks especially near the ultrasonic welding line, where stresses and thermal degradation are maximized. Due to the high ultrasonic power concentrated in welding spots during welding, antioxidants and HALS (hindered amine light stabilizers) may be degraded or diffused outside, leaving polymer in welding area with inferior long-term protection.
  • This test method measures the time to failure associated with a given test specimen made at a specified tensile load level, by exposing test samples to conditions that include submerging them in IGEPAL® CO-630 solution, under elevated temperature, in order to accelerate cracks initiation and propagation, while applying load to the sample.
  • the IGEPAL® CO-630 is a surfactant, accepted by industry and academy as a standard cracking initiating agent.
  • the coating may be able to lower the rate of ingress of cracking inducing molecules into the geocell matrix, and function as barrier against HALS (hindered amine light stabilizers) and antioxidant depletion from polymer matrix, out to the environment.
  • the method may include a step of applying a water borne or solvent borne coating on a geocell, so that a welding area or a portion of an area or the total surface of the geocell may be covered.
  • the coating may be characterized as having any one of the following: good adhesion to untreated or treated or modified with adhesion promoter polymer selected from polyethyleneor polypropylene, including alloys thereof with high performance polymer such as polyamide (or the like); good barrier properties against migration of salts, acids, and small organic molecules from soil or aqueous or granular material medium into geocell matrix, especially at a welding area of the geocell by small organic molecules having usually of molecular weight less than 800 Dalton or less than 10 carbon atoms in molecule.
  • adhesion promoter polymer selected from polyethyleneor polypropylene, including alloys thereof with high performance polymer such as polyamide (or the like)
  • good barrier properties against migration of salts, acids, and small organic molecules from soil or aqueous or granular material medium into geocell matrix especially at a welding area of the geocell by small organic molecules having usually of molecular weight less than 800 Dalton or less than 10 carbon atoms in molecule.
  • a coating according to certain embodiments of the present invention preferably exhibits suitable ‘retention of adhesion’ to a geocell strip matrix (polyethylene or polypropylene , including alloys thereof with high performance polymer such as polyamide (or the like)), which is the typical material from which a cellular confinement system is made from.
  • a geocell strip matrix polyethylene or polypropylene , including alloys thereof with high performance polymer such as polyamide (or the like)
  • Such ‘retention of adhesion’ may be assessed by submerging a coated sample for about 7 days in a solution of 10% w/w of IGEPAL® CO-630 and water, at about 65 degrees Celsius, and then washing the sample under tap water, and leaving it to dry at the ambient environment for about 48 hours and then the “adhesion” is tested by applying for up to several minutes 3MTM General Purpose Masking Tape 203 to the coated sample, and then pulling away the tape. If less than about 10% of the coating area is removed, the tested sample qualifies as a coating that may possibly exhibit long term durability according to certain embodiments of the invention.
  • certain embodiments of the invention may be defined as being aimed at disclosing a coated geocell seam able of withstanding a seam welding resistance test, such as in the ASTM standard D5397, so as time to failure is at least about 50% greater than uncoated geocell, made of same polymer at same gauge, welding power, pressure and welding horn and cell height.
  • a coated geocell seam welding long term durability may be able to undergo a seam durability test, per a modified ASTM D5397, exhibiting a time to failure that may be at least 2 times or even 3 times greater than the time to failure of an uncoated geocell, made from the same polymer at same gauge, welding power, pressure and welding horn and cell height.
  • a coating thickness may be measured by cutting a geocell and measuring the coating thickness using a microscope coating gauge, in a direction perpendicular to the geocell surface.
  • Such coating thickness in at least certain embodiments may vary e.g. from between about 0.1 to about 100 micrometers.
  • a coating according to at least certain embodiments of the present invention may comprise at least one barrier polymer (shortly BAPOL) selected from any one of the following: polyvinyl chloride and copolymers of vinyl chloride with ethylene and/or acrylic acid esters; hydrocarbons including aromatics, saturated and unsaturated; polyvinylidene chloride and copolymers of vinylidene chloride with ethylene and/or acrylic acid esters; poly ethylene vinyl acetate copolymers and terpolymers of acrylic acid esters; styrene copolymers and terpolymers; polyamide; polyester; copolymers and terpolymers of acrylic acid esters and methacrylic acid esters and blend thereof.
  • barrier polymer selected from any one of the following: polyvinyl chloride and copolymers of vinyl chloride with ethylene and/or acrylic acid esters; hydrocarbons including aromatics, saturated and unsaturated; polyvinylidene chloride and copolymers of vinylidene chloride with ethylene
  • the coating in accordance with at least certain embodiments of the invention may be defined as having any one of the following properties: elasticity with elongation at break of at least about 25% at 23 Celsius to possibly allow retention of adhesion and integrity during geocell installation; long term hydrolytic stability to possibly enable long term protection of up to several years, for example 25 years (or the like) in an outdoor environment; improved adhesion to untreated or treated or modified geocell matrix (and the like). [026] In certain cases, combining such properties may be challenging, since the higher the glass transition temperature (Tg) of a coating polymer, or its crystallinity – the lower the adhesion, but the better the barrier properties.
  • Tg glass transition temperature
  • this may be accomplished by providing a coating that may be formed by blending tacky, low Tg (below about 23 degrees Celsius) polymer or resin or oligomer, with a high barrier polymer (BAPOL) - or by copolymerizing polymers with good barrier (BAPOL) with side chains or block segments of low Tg polymer.
  • BAPOL high barrier polymer
  • Non-binding examples of hydrolytic stable low Tg, tacky polymers or resins or oligomers that that may be blended with BAPOL may be any one of: bitumen, rosin esters, phenolic tackifier and hydrocarbon tackifier, chlorinated polyethylene and chlorinated paraffin.
  • embodiments of the present invention may be defined as being directed to a geocell wherein durability of the geocell seams may be enhanced on and near welding’s.
  • a coating may be applied on a welding area (e.g. between about 10 to about 25 mm width, centered on welding), while a remainder or other outer surfaces of the geocell may remain substantially un-coated or coated by coating that may be thinner than the coating on welding area.
  • Such design may allow optimizing protection on the most sensitive area (i.e. the welding area), while avoiding waste of unnecessary costs on areas much more resistant.
  • a method of providing a seam welding durability test which can be based on the modified ASTM standard test D5397.
  • a welding may accordingly be a weak point in a geocell structure, instead of notched strips as in original ASTM D5397, two or more ultrasonically welded strips, about 20 to about 50 mm wide, may be tested.
  • a load of about 10 to about 50 percent of average ultimate weld split load at failure may be applied to the tested strips; and the stripe may be submerged in an aqueous solution having a cracking initiating agent of about 10% w/w IGEPAL® CO 630 in water, at temperature of about 50 to 70 Celsius degrees, in order to accelerate failure rate.
  • coated samples in accordance with various embodiments of the invention may be expected to last longer that uncoated samples, due to delay of diffusion of agent from solution into weld area.
  • FIG. 1A and 1B schematically show perspective views of folded and expanded states of a cellular confinement system in accordance with the embodiments of the present invention
  • Fig. 2 schematically shows a top view of a cellular confinement system in accordance with the embodiments of the present invention
  • Fig. 1A and 1B schematically shows perspective views of folded and expanded states of a cellular confinement system in accordance with the embodiments of the present invention
  • Fig. 2 schematically shows a top view of a cellular confinement system in accordance with the embodiments of the present invention
  • Fig. 1A and 1B schematically shows perspective views of folded and expanded states of a cellular confinement system in accordance with the embodiments of the present invention
  • Fig. 2 schematically shows a top view of a cellular confinement system in accordance with the embodiments of the present invention
  • FIG. 3 schematically shows a specimen of a cellular confinement system in accordance with an embodiment of the present invention, with supporting members located within each cell of the specimen;
  • Figs. 4A and 4B schematically show, respectively, perspective and cross sectional views of an embodiment of a test apparatus for testing failure of a specimen such as that seen in Fig.3;
  • Fig. 5 shows a table exhibiting test results obtained by a test apparatus such as that seen in Fig.4;
  • Fig. 6 shows a table exhibiting various CCS compositions and examples of coatings that may be applied thereto.
  • Figs. 1A and 1B showing a cellular confinement systems (10), also known as a CCS or geocells, in respective folded and expanded states.
  • the CCS 10 is formed from strips 12 of plastic materials that extend each along a respective longitudinal axis L, and are welded one to the other at weld regions 14 to form an array of cells 16 (best visible in the expanded state of the CCS).
  • Each strip 12 has a height H that is measured along an extension that is perpendicular to its longitudinal axis along the width of the strip that extends up from a ground face upon which the CCS is placed in a deployed and expanded state.
  • a distance T is defined between adjacent weld regions 14 within a given strip 12 when the CCS 10 is in a folded state where all the strips are held generally straight one alongside the other.
  • Attention is drawn to Fig. 2 showing a top view of the CCS 10 it its expanded state.
  • the CCS 10 in its various embodiments may be suited for use as a lower foundation beneath sites housing saline and/or chemical rich water. Such sites may be pools, ponds, landfills (or the like).
  • such a site where the CCS may be used may be evaporation pools where e.g. mineral-rich brine is stored for evaporation.
  • a CCS may fail due to exposure to concentrated organic or inorganic low molecular weight compounds, for examples acids, salts, oils, distillates and organic waste.
  • the root cause for premature failure may occur especially near the ultrasonic welding line, where stresses and thermal degradation are maximized.
  • antioxidants and HALS hinderedered amine light stabilizers
  • HALS hinderedered amine light stabilizers
  • cellular confinement systems (CCS) 10 in accordance with various embodiments of the present invention may be coated at least at their weld regions (seams) 14 with a high barrier coatings 15 to reduce exposure to substances that may be harmful to the welds in these regions, when such harm may be characterized by promoting failure near or at the ultrasonic welding lines of the weld regions 14.
  • a high barrier coatings 15 may be applied selectively to the weld regions 14 (as illustrated in the enlarged section in Fig.
  • the coatings 15 may not necessarily be applied only at or adjacent the weld regions 14 but also to larger areas of the CCS such as to the entire cellular confinement system (CCS).
  • CCS cellular confinement system
  • lateral width ‘w’ may be between about 10 – 30 millimeter
  • lateral width ‘c’ may be designed to be larger than ‘w’ so that it extends between about 5 to 50 millimeters beyond the lateral edges of the weld region 14 on both its lateral sides.
  • such coating may comprise one or more polymer latex emulsions, such as those available in the Vycar® 460X46, or Vycar® 577, or Vycar® 578, or PermaxTM 805 emulsions of the Lubrizol Corporation or the Diofan® PVDC coating of Solvay S.A.
  • a coating suitable for application on a weld region 14 may be based on a 50/50% w/w blend of Polyvinylidene chloride 577 (PVC) and bitumen latex. Blending with bitumen in some cases may assist in the bonding to the material of the strips 12 of a polyolefin or alloy of polyolefin and high performance polymer CCS 10, such as bonding to strips formed from Polyethylene or polypropylene or alloy thereof with high performance polymer (or the like). [056] In another embodiment, bonding of polyvinyl chloride 577 (PVC) may also be performed without blending with bitumen.
  • determining compliance of an embodiment of a cellular confinement system (CCS) 10 with long term seam welding durability may be performed by applying a modified ASTM D5397 (MAD) test to a specimen of a tested CCS.
  • a bonding promoting polymer such as PVC, or chlorinated polyethylene or ionomer resin with CCS matrix outer layers or all layers during extrusion of CCS strips, where a ratio of dispersed bonding promoting polymer to polyolefin or alloy may vary from about 1:100, to about 1:2.
  • determining compliance of an embodiment of a cellular confinement system (CCS) 10 with long term seam welding durability may be performed by applying a modified ASTM D5397 (MAD) test to a specimen of a tested CCS.
  • specimen 18 may include two cells 16 of a tested CCS 10 that are welded together by a weld region 14 that has been coated. Specimen 18 may be cut away from the CCS as seen by the dashed rectangle marked by numeral III in Fig 2. A height H of the specimen 18 may also be reduced e.g. to 20 millimeters. [059] Cylindrical members 20 having a diameter D may be inserted into each one of the cells 16 of the specimen in order to urge the cells to assume an expanded state.
  • the specimen may be defined as having an axis X that generally passes through the centers the two cylindrical members 20 and through the weld region 14 that is located therebetween, and the specimen may be include two coupling members 22 that are attached to the specimen at its opposing axial ends.
  • FIGs. 4A and 4B showing an embodiment of a modified ASTM D5397 (MAD) test setup 24.
  • the MAD test setup 24 has a test bath 241 filled with IGEPAL® CO-630 solution and one or more (in this example four) CCS specimens 18 that are located within the test bath 241 submerged within IGEPAL® CO-630 solution that is heated to about 65 degrees Celsius (+/- 3 Celsius).
  • Each specimen 18 is aligned with its axis X in an upright position and is anchored via its lower coupling 22 to a lower floor of the test bath 241 and at its upper coupling 22 via a cord to a first end of a lever 242 of the test setup 24.
  • Each lever 242 is hinged generally at its center to rotate about a rotational axis R and is attached as its opposing second end via a cord to a weight 243.
  • the weight stretches the specimen 18, and induces stress concentration in the seams welding in the weld region 14, at a realistic geometry and realistic stress distribution, until failure (possibly due to slow crack propagation (“crazing”) mode of stressed polymer in the seam) occurs and is logged.
  • Fig. 5 summarizes test results of five coated and five uncoated specimens 18. All tests were performed in a MAD test setup such as that shown and described with respect to the test setup 24 of Figs. 4A and 4B and with CCS specimens such as those seen and described with respect to the CCS specimens 18 of Fig.3.
  • the composition forming the strips 12 of the CCS 10 may be Polyethylene (HDPE or MDPE) or an alloy of Polyethylene with high performance polymer.
  • a typical high performance polymer is polyamide 6, blended in HDPE or MDPE, and compatibilized by maleic anhydride grafted polyethylene.
  • the high barrier coating 15 covering the weld regions 14 welding together the strips may comprise between about 50-95% w/w of any one of the following compositions: PVC, vinyl chloride- ethylene copolymer and terpolymers, PVDC, vinylidene chloride-ethylene copolymer and terpolymers, PVDF, vinyl fluoride-ethylene copolymer and terpolymers.
  • PVC vinyl chloride- ethylene copolymer and terpolymers
  • PVDC vinylidene chloride-ethylene copolymer and terpolymers
  • PVDF vinyl fluoride-ethylene copolymer and terpolymers.
  • tacky resins may be e.g. low OH terpene phenolics, Rosin esters, Styrenated terpenes, AMS, AMS phenolics, polyterpenes, C5 or C9 or DCPD hydrocarbons, [070]
  • the composition forming the strips 12 of the CCS 10 may generally comprise a blend of two groups.
  • a first group comprising between about 50-95% w/w of Polyethylene (HDPE or PDPE) or an alloy of Polyethylene with high performance polymer; and a second group comprising between about 50-5% w/w respectively of any one of the following adhesion promoting polymer: PVC, Chlorinated polyethylene, vinyl chloride-ethylene copolymer and terpolymers, ionomer.
  • compositions of the second group that may be melt blended together with the materials of the first group during extrusion of the strips of the CCS, may allow the high barrier coating suitable for application on this type of strip, to lower or be substantially devoid of martials such as the bitumen or other tacky resins (or the like) that assisted in the former example (tagged ‘1’) in the adherence of the coating to the strips.
  • This is due to the fact that the compositions of the second group act as so-called dispersed polar inclusions within the strips to which such a coating may be adhered.
  • the third example tagged ‘3’ in the left hand-side column of the table exhibits an option of use of a multi layered strip in the CCS, here comprising three layers, with an inner core layer of the strip made from Polyethylene (HDPE or MDPE) or an alloy of Polyethylene with high performance polymer being sandwiched between outer layers comprising between about 50-95% w/w of Polyethylene (HDPE or MDPE) or alloy of Polyethylene with high performance polymer and respectively between about 50-5% w/w of the compositions of the aforementioned second group, and dispersed phase of polar material allowing adhesion of coating .
  • a multi layered strip in the CCS here comprising three layers, with an inner core layer of the strip made from Polyethylene (HDPE or MDPE) or an alloy of Polyethylene with high performance polymer being sandwiched between outer layers comprising between about 50-95% w/w of Polyethylene (HDPE or MDPE) or alloy of Polyethylene with high performance polymer and respectively between about 50-5% w/w of the compositions of the
  • compositions of the second group may assist in adhesion to the high barrier coating, which here again may allow lowering or substantially avoiding presence of materials such as the bitumen or other tacky resins (or the like) that may be needed in high barrier coatings where adhesion may be required directly to Polyethylene.
  • all coatings may be applied to the strips of the CCS, by dipping or spraying substantially the entire strips of the CCS after welding of the strips - in or with the high barrier coating solution, and then leaving the coating to dry in air or hot air.
  • all coatings may be selectively applied to an area at or near the seams or weld regions, by spraying or brushing or roller coating the high barrier coating on a CCS in its open expanded state (such as that seen in Fig 1B) where the seams/weld-regions are better exposed. The coating may then be left to dry in air or hot air.

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Abstract

Un système de confinement cellulaire (CCS) comprend des bandes de matières plastiques qui sont soudées l'une à l'autre au niveau de zones de soudure pour former un réseau de cellules. Au moins les zone de soudure du CCS sont chacune dotées d'un revêtement barrière fort qui confère une durabilité à long terme au CCS.
PCT/IB2022/053339 2021-04-11 2022-04-09 Système de confinement cellulaire WO2022219483A1 (fr)

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EP22787727.1A EP4323589A1 (fr) 2021-04-11 2022-04-09 Système de confinement cellulaire
CN202280040729.4A CN117480300A (zh) 2021-04-11 2022-04-09 蜂窝约束系统

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US202163173437P 2021-04-11 2021-04-11
US63/173,437 2021-04-11

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EP (1) EP4323589A1 (fr)
CN (1) CN117480300A (fr)
AR (1) AR125677A1 (fr)
CL (1) CL2023003953A1 (fr)
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