A transition zone impermeable material, its preparation method and application

Abstract

The application provides a transition zone anti-seepage material and a preparation method and application thereof, and meets the following conditions: in a curve of welding peel strength of the transition zone anti-seepage material and HDPE geomembrane changing with displacement, there is a curve segment with peel strength greater than or equal to 6 N / mm in an interval where the displacement is greater than 30 mm; in a curve of welding peel strength of the transition zone anti-seepage material and TPO geomembrane changing with displacement, there is a curve segment with peel strength greater than or equal to 6 N / mm in an interval where the displacement is greater than 30 mm. The application can improve the connection reliability of HDPE geomembrane and TPO geomembrane, improve the anti-seepage reliability of a combined type geomembrane anti-seepage system, and avoid problems such as joint leakage of the combined type geomembrane anti-seepage system under actual service conditions.

Description

Technical Field

[0001] This invention relates to the field of impermeable materials, specifically to a transition zone impermeable material, its preparation method, and its application. Background Technology

[0002] In large-scale water conservancy and hydropower seepage prevention projects (such as reservoir basins, dam faces, and water diversion channels of hydropower stations), different types of geomembrane seepage prevention systems need to be used in adjacent engineering parts, taking into account actual geological conditions and cost factors. It is common to use HDPE geomembrane and TPO geomembrane as seepage prevention materials on the same working face. In this case, HDPE geomembrane and TPO geomembrane need to be connected. However, due to the poor compatibility between HDPE geomembrane and TPO geomembrane, the reliability of their connection is poor. Specifically, whether HDPE geomembrane and TPO geomembrane are directly welded or bonded with adhesive, the joint peel strength of HDPE geomembrane and TPO geomembrane is low, usually not exceeding 3N / mm. Under actual service conditions, joint leakage and other problems are prone to occur, affecting the quality of the project. Summary of the Invention

[0003] This invention provides a transition zone seepage-proof material, its preparation method, and its application. This transition zone seepage-proof material can improve the connection reliability of HDPE geomembrane and TPO geomembrane, and avoid problems such as joint leakage in combined geomembrane seepage-proof systems under actual service conditions.

[0004] In one aspect, the present invention provides a transition zone waterproofing material, wherein the transition zone waterproofing material satisfies the following: in the curve of the weld peel strength of the transition zone waterproofing material and the HDPE geomembrane as a function of displacement, there exists a segment in the range where the displacement exceeds 30 mm, and the weld peel strength of the transition zone waterproofing material and the TPO geomembrane as a function of displacement, there exists a segment in the range where the displacement exceeds 30 mm, and the weld peel strength of the transition zone waterproofing material and the TPO geomembrane as a function of displacement, there exists a segment in the range where the displacement exceeds 30 mm, and the weld peel strength of the transition zone waterproofing material and the TPO geomembrane is greater than or equal to 6 N / mm.

[0005] According to one embodiment of the present invention, in the curve of the weld peel strength of the transition zone impermeable material and the HDPE geomembrane as a function of displacement, there is a curve segment in the range where the displacement exceeds 50 mm, and / or, in the curve of the weld peel strength of the transition zone impermeable material and the TPO geomembrane as a function of displacement, there is a curve segment in the range where the displacement exceeds 50 mm, and the peel strength is greater than or equal to 6 N / mm.

[0006] According to one embodiment of the present invention, the transition zone waterproofing material includes a resin membrane layer, the resin membrane layer including polyethylene resin, polypropylene resin, olefin block copolymer resin, filler and flux, the flux including rosin-based materials.

[0007] According to one embodiment of the present invention, the polyethylene resin accounts for 25%-60% of the mass of the resin film layer; and / or, the polypropylene resin accounts for 12%-38% of the mass of the resin film layer; and / or, the olefin block copolymer resin accounts for 4%-26% of the mass of the resin film layer; and / or, the filler accounts for 10%-40% of the mass of the resin film layer; and / or, the flux accounts for 0.1%-8% of the mass of the resin film layer; and / or, the polyethylene resin includes one or more of high-density polyethylene, medium-density polyethylene, and linear low-density polyethylene; and / or, the density of the polyethylene resin is 0.920-0.955 g / cm³. 3 The melt flow index at 190℃ and 2.16KG is between 0.15 and 4.0 g / 10min; and / or, the polypropylene resin includes one or more of propylene / ethylene / butene terpolymer polypropylene, propylene / ethylene binary copolymer polypropylene, and homopolymer polypropylene; and / or, the density of the polypropylene resin is between 0.850 and 0.930 g / cm³. 3 The melt flow index at 230℃ and 2.16KG is between 0.3 and 3.5 g / 10min; and / or, the olefin block copolymer resin includes one or more of ethylene / α-octene block copolymer and propylene / ethylene block copolymer; the density of the ethylene / α-octene block copolymer is between 0.860 and 0.890 g / cm³. 3 The melt flow index of the propylene / ethylene block copolymer is between 0.3 and 5.0 at 190℃ and 2.16KG; the density of the propylene / ethylene block copolymer is between 0.870 and 0.910 g / cm³. 3 The melt flow index at 230℃ and 2.16KG is between 6.0 and 10.0; and / or the filler includes one or more of calcium carbonate, talc, calcined kaolin, and calcite; and / or the rosin material includes one or more of polymerized rosin, rosin ester, and hydrogenated rosin; the transition zone impermeable material is the resin membrane layer, or the transition zone impermeable material further includes a support layer composite with the resin membrane layer, the support layer including non-woven fabric and / or mesh fabric.

[0008] According to one embodiment of the present invention, the resin film layer further includes an antioxidant, a light stabilizer, and a pigment. The mass parts of each component of the resin film layer are as follows: 25-60 parts of polyethylene resin, 12-38 parts of polypropylene resin, 4-26 parts of the olefin block copolymer, 10-40 parts of filler, 0.1-8 parts of flux, 0.1-2 parts of antioxidant, 0.1-2 parts of light stabilizer, and 0.1-5 parts of pigment.

[0009] According to one embodiment of the present invention, the antioxidant includes organic phosphites and / or hindered phenolic antioxidants; and / or, the light stabilizer includes hindered amine light stabilizers; and / or, the pigment includes one or more of titanium dioxide (TiO2), carbon black, iron oxide, Prussian blue, lead silicate, monoazo, diazo, and phthalocyanine.

[0010] According to one embodiment of the present invention, the hardness of the transition zone impermeable material is less than that of the HDPE geomembrane, and the hardness of the transition zone impermeable material is greater than that of the TPO geomembrane; and / or, the hardness of the transition zone impermeable material is between 40 and 55 Shore D; and / or, the transition zone impermeable material is an edge sealing welding rod or a transition zone impermeable membrane.

[0011] In another aspect, the present invention provides a method for preparing the above-mentioned transition zone impermeable material, comprising the following steps: extruding a material for forming a resin layer to form a resin layer, thereby obtaining the transition zone impermeable material.

[0012] According to one embodiment of the present invention, the process of extruding the material used to form the resin layer includes: extruding the material used to form the resin layer through a twin-screw extruder to form a resin layer, thereby obtaining a transition zone waterproof material; or, the process of extruding the material used to form the resin layer includes: extruding and granulating the material used to form the resin layer through a twin-screw extruder, and then extruding the resulting granules through a single-screw extruder to form a resin layer, thereby obtaining a transition zone waterproof material; and / or, the transition zone waterproof material further includes a support layer composited with the resin layer, the support layer comprising nonwoven fabric and / or mesh fabric; the preparation process of the transition zone waterproof material further includes a process of composited resin layer with support layer.

[0013] In another aspect, the present invention provides an application of the aforementioned transition zone impermeable material in welding HDPE geomembranes and TPO geomembranes.

[0014] The present invention provides a transition zone seepage-proof material, its preparation method, and its application. The transition zone seepage-proof material can simultaneously improve the welding strength between the transition zone seepage-proof material and the HDPE geomembrane (in the peel strength variation curve of the transition zone seepage-proof material and the HDPE geomembrane with displacement, there is a curve segment with a peel strength greater than or equal to 6 N / mm in the displacement range exceeding 30 mm), and the welding strength between the transition zone seepage-proof material and the TPO geomembrane (in the peel strength variation curve of the transition zone seepage-proof material and the TPO geomembrane with displacement, there is a curve segment with a peel strength greater than or equal to 6 N / mm in the displacement range exceeding 30 mm). This transition zone seepage-proof material can be used as a welding material to connect the HDPE geomembrane and the TPO geomembrane, resulting in a stronger bond between the HDPE geomembrane and the TPO geomembrane. This prevents problems such as opening or cracking at the joint (seam) between the two, effectively avoiding joint leakage problems in combined geomembrane seepage-proof systems under actual service conditions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a combined geomembrane seepage prevention system formed by welding HDPE geomembrane and TPO geomembrane using transition zone seepage prevention material according to one embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of a combined geomembrane seepage prevention system formed by welding HDPE geomembrane and TPO geomembrane using transition zone seepage prevention material according to another embodiment of the present invention.

[0017] Figure 3 The figures show the weld peel strength curves of the transition zone geomembrane material and the TPO geomembrane or HDPE geomembrane in Example 1 and the weld peel strength curves of the TPO geomembrane and HDPE geomembrane in Comparative Example 1.

[0018] Figure 4 The weld peel strength curves of the transition zone geomembrane and HDPE geomembrane in Example 1 and Comparative Example 2 are shown.

[0019] Figure 5 The weld peel strength curves of the transition zone geomembrane and TPO geomembrane in Example 1 and Comparative Example 3 are shown.

[0020] Figure 6 The figures show the weld peel strength curves of HDPE geomembrane and TPO geomembrane after edge sealing and pressure welding using edge sealing welding rods in Example 1, and the weld peel strength curves of TPO geomembrane and HDPE geomembrane in Comparative Example 1.

[0021] Explanation of reference numerals in the attached drawings: 1: HDPE geomembrane; 2: TPO geomembrane; 3: Transition zone seepage prevention material; 300: Main body; 301: First connection part; 302: Second connection part; 303: Third connection part, third welding part; 4: Fourth connection part; x: First direction; y: Second direction. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below. The specific embodiments listed below are merely descriptions of the principles and features of the present invention, and the examples are only for explaining the present invention and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In large-scale water conservancy and hydropower seepage prevention projects (such as reservoir basins, dam faces, and water diversion channels of hydropower stations), considering actual geological conditions and cost factors, it is often necessary to use both HDPE geomembrane and TPO geomembrane as seepage prevention materials on the same working face. In this case, it is necessary to connect the high-density polyethylene (HDPE) geomembrane and the thermoplastic polyolefin (TPO) geomembrane. Generally, rigid anchoring, adhesive bonding, and welding can be used. However, these connection methods generally suffer from poor connection reliability and are prone to joint leakage under actual service conditions, affecting the quality of the project.

[0024] Specifically, for rigid anchoring connections, a concrete structure is constructed between the HDPE geomembrane and the TPO geomembrane to rigidly anchor the joints of the two on the concrete structure. Then, an elastic sealing agent is used for edge sealing. This connection method is complex, and rigid anchoring is a destructive anchoring method. There are seepage channels between the anchor and the geomembrane. At the same time, due to the large difference in stiffness between the geomembrane and the concrete, and the different thermal expansion and contraction effects of the materials, the elastic sealing agent is not very effective in actual edge sealing, and is prone to opening or complete detachment, resulting in leakage at the rigid anchoring point.

[0025] For HDPE geomembrane and TPO geomembrane bonded together with adhesives, the bonding effect with commonly used adhesives is poor due to the weak polarity and low surface energy of both. The peel strength of the bonded joint is low (≤3N / mm), which is less than the bulk strength of either of them. In actual service, the joint is easily pulled apart due to factors such as water pressure or base settlement, which can lead to leakage.

[0026] The usual method for welding HDPE geomembrane and TPO geomembrane is to directly weld them together. However, although HDPE geomembrane and TPO geomembrane are both weldable, their compatibility is poor due to differences in materials, making reliable welding impossible. Regardless of whether single-seam or double-seam welding is used, the weld strength formed after direct welding is low (weld peel strength ≤3N / mm), which is less than the strength of either geomembrane. This makes them prone to peeling and damage. In actual service, they are easily pulled apart due to water pressure or base settlement, leading to leakage.

[0027] Therefore, how to improve the connection reliability of HDPE geomembrane and TPO geomembrane, improve the seepage prevention reliability of the combined geomembrane seepage prevention system composed of HDPE geomembrane and TPO geomembrane, and avoid problems such as joint leakage during use are technical problems that urgently need to be solved in this field.

[0028] In view of this, embodiments of the present invention provide a transition zone impermeable material, which satisfies the following: in the curve of the weld peel strength of the transition zone impermeable material and the HDPE geomembrane as a function of displacement, there exists a curve segment with a peel strength greater than or equal to 6 N / mm in the displacement range exceeding 30 mm; and in the curve of the weld peel strength of the transition zone impermeable material and the TPO geomembrane as a function of displacement, there exists a curve segment with a peel strength greater than or equal to 6 N / mm in the displacement range exceeding 30 mm.

[0029] The transition zone geomembrane of this invention exhibits a peel strength greater than or equal to 6 N / mm in the weld peel strength curve between the transition zone geomembrane and HDPE geomembrane, even in the displacement range exceeding 30 mm. Similarly, in the weld peel strength curve between the transition zone geomembrane and TPO geomembrane, the peel strength remains greater than or equal to 6 N / mm even in the displacement range exceeding 30 mm. This simultaneously improves the weld strength between the transition zone geomembrane and HDPE geomembrane, as well as the weld strength between the transition zone geomembrane and TPO geomembrane. This transition zone geomembrane can be used to weld HDPE geomembrane and TPO geomembrane, reducing the problem of incomplete welds and ensuring a strong bond between the HDPE and TPO geomembranes. It also prevents openings or cracks at the joint, effectively avoiding joint leakage problems in combined geomembrane geomembrane geomembrane systems under actual service conditions.

[0030] For example, in the curve of the weld peel strength of the transition zone impermeable material and HDPE geomembrane as a function of displacement, there are curve segments with a peel strength greater than or equal to 6 N / mm in the range where the displacement exceeds 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, and 200 mm, or there are curve segments with a peel strength greater than or equal to 6 N / mm in the range defined by any two of the aforementioned values.

[0031] For example, in the curve of the weld peel strength of the transition zone impermeable material and TPO geomembrane as a function of displacement, there are curve segments with a peel strength greater than or equal to 6 N / mm in the range where the displacement exceeds 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, and 200 mm, or there are curve segments with a peel strength greater than or equal to 6 N / mm in the range defined by any two of the aforementioned values.

[0032] In some embodiments, in the weld peel strength curve of the transition zone geomembrane and HDPE geomembrane versus displacement, there exists a segment with a peel strength greater than or equal to 6 N / mm in the displacement range exceeding 50 mm. Similarly, in the weld peel strength curve of the transition zone geomembrane and TPO geomembrane versus displacement, there exists a segment with a peel strength greater than or equal to 6 N / mm in the displacement range exceeding 50 mm. This makes it easier for the transition zone geomembrane to be used for welding HDPE geomembrane and TPO geomembrane, reducing the problem of incomplete welds and ensuring a stronger bond between the HDPE geomembrane and TPO geomembrane. It also makes it less likely for problems such as opening or cracking to occur at the joint (seam) between the two, effectively avoiding joint leakage problems in the combined geomembrane ...

[0033] In this embodiment of the invention, the transition zone impermeable material 3 may include a resin membrane layer, which comprises a resin material, including polyethylene resin, polypropylene resin (flexible polypropylene), olefin block copolymer resin, filler, and flux. In this transition zone impermeable material system, the transition zone impermeable material 3 simultaneously contains polyethylene resin and polypropylene resin, and introduces olefin block copolymer resin to compatibilize and modify the blend system of polyethylene resin and polypropylene resin. Utilizing the block characteristics and other properties of the compatibilizing resin (olefin block copolymer resin), the thermal adhesion between the transition zone impermeable material 3 and HDPE and TPO geomembrane 2 is improved, further enhancing the compatibility of the transition zone impermeable material 3 with both HDPE geomembrane 1 and TPO geomembrane 2. This improves the welding strength between the transition zone impermeable material 3 and HDPE geomembrane 1, and simultaneously improves the welding strength between the transition zone impermeable material 3 and TPO geomembrane 2, as well as the welding strength when using the transition zone impermeable material 3 as an edge sealing electrode for HDPE geomembrane 1. The welding strength of geomembrane 1 and TPO geomembrane 2 during edge sealing further improves the connection reliability between HDPE geomembrane 1 and TPO geomembrane 2. Simultaneously, the combination with rosin-based materials containing a tricyclic phenanthrene skeleton, which has hydrophobic properties, allows for the construction of a transition zone impermeable material suitable for long-term immersion environments. Furthermore, the introduction of fillers into the transition zone impermeable material increases its surface roughness. The low surface energy of rosin-based materials, when mixed with other low-surface-energy rosin, reduces the surface tension of the transition zone impermeable material, increasing its wettability to HDPE geomembrane 1 and other geomembranes during welding. This, in turn, improves the welding strength and reliability of the transition zone impermeable material with HDPE geomembrane 1 and other geomembranes.

[0034] Specifically, the olefin block copolymer resin includes one or more of ethylene / α-octene block copolymer and propylene / ethylene block copolymer (OBC), which further improves the compatibility of the blend system of polyethylene resin and polypropylene resin, as well as the compatibility of the transition zone impermeable material 3 with HDPE geomembrane 1 and TPO geomembrane 2, thereby improving the connection reliability of HDPE geomembrane 1 and TPO geomembrane 2.

[0035] Furthermore, according to the inventors' research, if olefin copolymers with polar groups (such as maleic anhydride-grafted polyethylene / polypropylene, ethylene-methacrylate copolymers, etc.) are used to compatibilize and modify the blend system of copolymer polyethylene and copolymer polypropylene, or polyethylene and homopolymer polypropylene, the introduction of polar groups will reduce the long-term immersion stability of the material, leading to water absorption and swelling. However, by further using the above-mentioned olefin block copolymer combination without polar groups to compatibilize and modify the blend system of polyethylene resin and flexible polypropylene, the connection reliability of HDPE geomembrane 1 and TPO geomembrane 2 can be improved, while also making the transition zone seepage prevention material 3 system stable and durable, adaptable to long-term immersion environment, and less prone to water absorption and swelling, further improving the seepage prevention reliability of the combined geomembrane seepage prevention system.

[0036] In some embodiments, the density of the ethylene / α-octene block copolymer can be between 0.860 and 0.890 g / cm³. 3 The melt index (melt index (190℃ / 2.16KG)) under the conditions of 190℃ and 2.16KG can be between 0.3 and 5.0.

[0037] In some embodiments, the density of the propylene / ethylene block copolymer can be between 0.870 and 0.910 g / cm³. 3 The preferred concentration is between 0.87 and 0.88 g / cm³. 3 The melt index (melt index (230℃ / 2.16KG)) under the conditions of 230℃ and 2.16KG can be between 6.0 and 10.0, preferably between 6.0 and 7.0 g / 10min.

[0038] For example, the olefin block copolymer resins mentioned above can be Dow Chemical's Infuse and Intune series resins, such as Infuse 9100 (ethylene / α-octene block copolymer) and Intune d5535 (propylene / ethylene block copolymer).

[0039] In some embodiments, the mass ratio of polyethylene resin to the resin film layer can be 25%-60%, such as 25%, 30%, 35%, 40%, 45%, 50%, 55%, or 60%.

[0040] In some embodiments, the mass ratio of polypropylene resin to the resin film layer can be 12%-38%, such as 12%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35%, or 38%.

[0041] And / or, the olefin block copolymer resin may account for 4%-26% of the resin film by mass, for example, 4%, 7%, 10%, 13%, 16%, 19%, 21%, 23% or 26%, etc.

[0042] Specifically, polyethylene resin may include one or more of high-density polyethylene (HDPE), medium-density polyethylene (MDPE), and linear low-density polyethylene (LLDPE).

[0043] Specifically, the density of polyethylene resin can range from 0.920 to 0.955 g / cm³. 3 Between these values, the melt index (i.e., melt index (190℃ / 2.16KG)) under the conditions of 190℃ and 2.16KG can be between 0.15 and 4.0 g / 10min.

[0044] For example, polyethylene resin can be Fujian United Petrochemical's DGDA 6094 (high-density polyethylene), Sinopec's TR144 (high-density polyethylene), ExxonMobil's Enable4009MC (medium-density polyethylene), Sinopec's mPEE332H (medium-density polyethylene), ExxonMobil's Exceed S 9243ML (linear low-density polyethylene), etc.

[0045] In some preferred embodiments, the medium-density polyethylene may specifically include metallocene-catalyzed medium-density polyethylene, with a density of 0.93-0.94 g / cm³. 3 Examples include ExxonMobil's Enable4009MC (medium-density polyethylene) and Sinopec's mPE E332H (medium-density polyethylene).

[0046] In addition, polypropylene resin may include one or more of the following: propylene / ethylene / butene terpolymer polypropylene (C3 / C2 / C4 terpolymer polypropylene (reactive grade TPO)), propylene / ethylene binary copolymer polypropylene (C3 / C2 binary copolymer polypropylene), and homopolymer polypropylene.

[0047] Specifically, the density of polypropylene resin can range from 0.850 to 0.930 g / cm³. 3 Between these values, the melt index (melt index (230℃ / 2.16KG)) under the conditions of 230℃ and 2.16KG can be between 0.3 and 3.5 g / 10min.

[0048] For example, polypropylene resins can be LyondellBasell's Hifax CA 10A (reactive TPO), Dow Chemical's Versify 2300, ExxonMobil's Vistamaxx 6102 (C3 / C2 binary copolymer polypropylene), Sinopec's B9302 (C3 / C2 binary copolymer polypropylene), and Sinopec's MO2d (homogeneous polypropylene), etc.

[0049] In some preferred embodiments, the polypropylene resin comprises reactive grade TPO with a density of 0.87-0.89 g / cm³. 3 The melt index (230℃ / 2.16KG) can be between 0.3 and 1.0 g / 10min. For example, the polypropylene resin can be LyondellBasell's Hifax CA 10A (reactive grade TPO).

[0050] In some embodiments, the filler accounts for 10%-40% of the mass of the resin membrane layer, for example, 10%, 15%, 20%, 25%, 30%, 35%, or 40%. By filling the transition zone impermeable material 3 with filler within the above-mentioned dosage range, the surface roughness of the transition zone impermeable material 3 can be increased. Combined with low surface energy rosin-based materials, the surface tension is reduced, and the wettability of the transition zone impermeable material to the surface of geomembranes such as HDPE geomembranes is increased during the welding process, further improving the welding strength and reliability of the transition zone material with HDPE geomembrane 1 and TPO geomembrane 2.

[0051] Specifically, the filler may include one or more of calcium carbonate, talc, calcined kaolin, and calcite. Among these, ultrafine activated heavy calcium carbonate is preferred, with a bulk density of 1-1.3 g / cm³. 3 The average particle size (D50) is between 4.0 and 6.0 μm, for example, using Omyacarb 6 from Omya Calcium Industry.

[0052] In some embodiments, the flux accounts for 0.1%-8% of the mass of the resin film layer, such as 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, or 8%. By introducing flux (rosin-based materials) within this content range into the transition zone geomembrane material, it is more beneficial to utilize the hydrophobic function and low surface energy properties of rosin-based materials, thereby improving the water resistance of the transition zone geomembrane material. At the same time, it increases the wettability of the transition zone geomembrane material to the surface of geomembranes such as HDPE geomembrane during the welding process, further improving the welding strength and reliability of the transition zone material with HDPE geomembrane 1 and TPO geomembrane 2.

[0053] In some embodiments, the flux (rosin-based material) may include one or more of polymerized rosin, rosin ester, and hydrogenated rosin, which is more conducive to the synergistic effect of the flux with components such as olefin block copolymers and fillers, giving full play to the hydrophobic function and low surface energy properties of rosin-based materials, improving the water resistance of the transition zone seepage prevention material, and increasing the wettability of the transition zone seepage prevention material to the surface of geomembranes such as HDPE geomembrane during the welding process, thereby further improving the welding strength and reliability of the transition zone material to HDPE geomembrane 1 and TPO geomembrane 2.

[0054] In some preferred embodiments, the flux includes polymerized rosin and hydrogenated rosin, with a mass ratio of 1:(0.8 to 1.2), for example, about 1:1.

[0055] In this embodiment of the invention, the rosin materials used can be obtained by conventional methods in the art, such as commercial purchase or self-made by conventional methods in the art. For example, polymerized rosin can be Eastman's POLY-PALE, rosin ester can be Kraton's Sylvalite RE 105L, and hydrogenated rosin can be Eastman's AX-E, etc.

[0056] In addition, the transition zone waterproofing material 3 may also include one or more of oxidants, light stabilizers, and pigments.

[0057] Specifically, antioxidants may include organic phosphites and / or hindered phenolic antioxidants, which may be a combination system of low-volatility, hydrolysis-resistant organic phosphites and hindered phenolic antioxidants, such as BASF's Irganox B 225.

[0058] Specifically, the light stabilizer may include hindered amine light stabilizers, which may be block oligomerized hindered amine light stabilizers, such as BASF's Chimassorb 2020.

[0059] Specifically, the pigments may include one or more of titanium dioxide (TiO2), carbon black, iron oxide, Prussian blue, lead silicate, monoazo, diazo, and phthalocyanine. Among them, titanium dioxide (titanium white) may include rutile TiO2, such as LR-972 from Longmang Titanium Industry.

[0060] In some embodiments, the antioxidant may account for 0.1%-2% of the mass of the resin film, for example, 0.1%, 0.3%, 0.5%, 0.8%, 1%, 1.3%, 1.5%, 1.8%, or 2%.

[0061] In some embodiments, the light stabilizer may account for 0.1% to 2% of the mass of the resin film, for example, 0.1%, 0.3%, 0.5%, 0.8%, 1%, 1.3%, 1.5%, 1.8%, or 2%.

[0062] In some embodiments, the pigment may account for 0.1% to 5% of the mass of the resin film, for example, 0.1%, 0.3%, 0.5%, 0.8%, 1%, 1.5%, 2%, 3%, 4%, or 5%.

[0063] In some specific embodiments, the mass parts of each component of the resin film layer are as follows, by weight: 25-60 parts of polyethylene resin, 12-38 parts of polypropylene resin, 4-26 parts of olefin block copolymer, 10-40 parts of filler, 0.1-8 parts of flux, 0.1-2 parts of antioxidant, 0.1-2 parts of light stabilizer, and 0.1-5 parts of pigment.

[0064] In this embodiment of the invention, the transition zone waterproofing material 3 can be the above-mentioned resin membrane layer (i.e., the transition zone waterproofing material 3 is a homogeneous transition zone waterproofing material), or the transition zone waterproofing material 3 can also include a support layer composite with the above-mentioned resin layer (i.e., the transition zone waterproofing material is a composite transition zone waterproofing material). The support layer can include non-woven fabric and / or mesh fabric. The mesh fabric can include fiber mesh fabric, that is, the forming material of the mesh fabric can include fiber material, and the fiber material can specifically include polyester fiber and / or glass fiber (glass fiber).

[0065] Specifically, when the transition zone waterproofing material 3 further includes a support layer, at least one side of the support layer has the aforementioned resin layer. For example, one side of the support layer has a resin layer. In this case, the transition zone waterproofing material 3 consists of a resin layer and a support layer, with the support layer located on the back of the resin layer. The transition zone waterproofing material 3 is a backing type transition zone waterproofing material. Alternatively, both opposite sides of the support layer have resin layers, that is, the transition zone waterproofing material 3 includes two resin layers and a support layer located between the two resin layers.

[0066] In some specific embodiments, the support layer is a non-woven fabric, and one side of the non-woven fabric has a resin layer (i.e., the transition zone waterproofing material 3 is a composite (backing type) transition zone waterproofing material).

[0067] In some other specific embodiments, the support layer is a mesh fabric with resin layers on both sides of the mesh fabric. That is, the transition zone waterproofing material 3 includes two resin layers and a mesh fabric located between the two resin layers.

[0068] Furthermore, the transition zone impermeable material 3 can be in strip or membrane form. Specifically, the transition zone impermeable material 3 can be used as an edge sealing electrode (strip) at the overlapping edge of the HDPE geomembrane 1 and TPO geomembrane 2 (e.g., Figure 2 (as shown); or, the transition zone geomembrane 3 can be a transition zone geomembrane (membrane-like, or called transition zone geomembrane material), when the transition zone geomembrane 3 is used as a transition zone geomembrane material to connect the HDPE geomembrane 1 and the TPO geomembrane 2 (as shown). Figure 1 As shown, the transition zone impermeable material 3 can be welded to the HDPE geomembrane 1 and TPO geomembrane 2 at the overlapping edges respectively.

[0069] This invention also provides a method for preparing the above-mentioned transition zone impermeable material 3, comprising the following steps: extruding a material for forming a resin layer to form a resin layer, thereby obtaining the transition zone impermeable material 3.

[0070] Specifically, during the extrusion molding process, a suitable mold can be used to form a resin layer of a preset shape, thereby forming a transition zone waterproofing material 3 of a preset shape. For example, when forming a strip-shaped transition zone waterproofing material (edge ​​sealing welding rod) 3, a round hole mold can be used for extrusion molding to obtain the strip-shaped transition zone waterproofing material 3; when forming a film-shaped transition zone waterproofing material 3, a flat extrusion mold can be used for extrusion molding to obtain the film-shaped transition zone waterproofing material 3.

[0071] In some embodiments, as described above, the transition zone waterproofing material further includes a support layer composited with the resin layer, the support layer may include nonwoven fabric and / or mesh fabric, and the preparation process of the transition zone waterproofing material further includes a process of composited resin layer with support layer.

[0072] In this embodiment of the invention, the resin layer and the support layer can be composited by hot pressing to obtain the transition zone waterproofing material 3. Specifically, in the preparation process of the transition zone waterproofing material 3, a twin-screw extruder and / or a single-screw extruder can be used for extrusion, and then the extruded material can be hot-pressed with the support layer to obtain the transition zone waterproofing material 3.

[0073] In this embodiment of the invention, the resin layer can be formed by a one-step molding method or a two-step molding method to prepare the transition zone waterproof material 3 (such as a transition zone waterproof membrane or a transition zone material used to form an edge sealing electrode).

[0074] In some embodiments, the resin layer is formed by a one-step molding method, that is, the process of extruding the material used to form the resin layer includes: extruding the material used to form the resin layer through a twin-screw extruder to form the resin layer and obtain the transition zone waterproof material 3.

[0075] Specifically, in the one-step molding process, the resin material is mixed evenly with other materials (powder) and then extruded through a twin-screw extruder to directly form a transition zone geomembrane 3 of a predetermined shape. When preparing the transition zone geomembrane, a flat extrusion die is used during extrusion through the twin-screw extruder to form a film-like transition zone geomembrane. When preparing the transition zone material for forming edge-sealing welding rods, a round-hole die can be used during extrusion through the twin-screw extruder to obtain the transition zone material. When the transition zone geomembrane includes a support layer, the membrane extruded from the twin-screw extruder can be hot-pressed with the support layer to obtain the transition zone geomembrane 3.

[0076] For example, the process of forming a resin layer by one-step molding may include: mixing resin granules (resin material) and powder separately and evenly using a high-speed mixer, and performing shear-blending extrusion using a twin-screw extruder (using a flat extrusion die), wherein the resin granules are fed from the feed port at the beginning of the screw, and the powder is fed from the side feed port; then: (a) when the transition zone geomembrane does not include the support layer, the sheet extruded from the die directly enters the three-roll calender for thickness determination, and then is trimmed, cut to length, wound up, and packaged to obtain the transition zone geomembrane (homogeneous transition zone geomembrane); (b) when the transition zone geomembrane includes the support layer, the process of hot-pressing the support layer and the resin layer may include: unwinding the support layer from the back of the three rolls and winding it to the front of the three rolls, and entering the middle and lower rolls together with the raw material extruded from the die for hot-pressing and thickness determination, and then trimming, cutting to length, and winding up to obtain the composite membrane after the resin layer and support layer are combined.

[0077] When the support layer (e.g., nonwoven fabric) has a resin layer on one side, step (b) is performed to composite the resin layer on one side of the support layer. The resulting composite membrane is the transition zone geomembrane material (composite (backed) transition zone geomembrane material) 3.

[0078] When the support layer (e.g., mesh fabric) has resin layers on both sides (hereinafter referred to as the first side and the second side of the support layer), step (b) is performed first to laminate the resin layer on the first side of the support layer. Then, the resulting composite membrane is unwound and reversed, and step (b) is repeated (i.e., the composite membrane is unwound from the back of the three rollers and wound to the front of the three rollers, and then entered between the middle and lower rollers together with the raw material extruded from the die for hot pressing and thickness setting, followed by edge trimming, length cutting, and winding) to laminate the resin layer on the second side of the composite membrane, thus obtaining the composite transition zone seepage-proof material 3.

[0079] After the transition zone impermeable material 3 is prepared through the above preparation process, it can be packaged or otherwise processed as needed, without any particular restrictions.

[0080] In the above preparation process, during the formation of the resin layer by one-step molding, the barrel temperature of the twin-screw extruder can be set to 165-195℃, such as 165℃, 170℃, 175℃, 180℃, 185℃, 190℃, 195℃ or any combination thereof, specifically ensuring that the melt temperature does not exceed 230℃.

[0081] Furthermore, the process of preparing edge-sealing welding rods by one-step molding can include: mixing the resin granules and powder in the formula evenly using a high-speed mixer, and then performing shearing, blending, extrusion, and granulation using a twin-screw extruder (using a round die to form an extruded product (strip) in the shape of an edge-sealing welding rod). The resin granules are fed from the feed port at the beginning of the screw, and the powder is fed from the side feed port. The strip extruded from the die is cooled by circulating water in a water tank, drawn, air-dried, cut to a fixed length, dried, and collected to obtain a transition strip material for forming the edge-sealing welding rod. The barrel temperature of the twin-screw extruder can be set to 165-195℃ to ensure that the melt temperature does not exceed 230℃. By controlling the ratio of extrusion volume to traction speed, the diameter of the transition strip material used to form the edge-sealing welding rod is controlled to be around 3-4mm.

[0082] After obtaining the transition strip material for forming the edge sealing electrode, the electrode can be extruded using a handheld extrusion welding gun to press and seal the overlapping area of ​​HDPE geomembrane 1 and TPO geomembrane 2.

[0083] In other embodiments, the resin layer is formed by a two-step molding method, that is, the material used to form the resin layer is extruded and granulated by a twin-screw extruder, and then the resulting granules are extruded and molded by a single-screw extruder to form the resin layer, thereby obtaining the transition zone waterproof material 3.

[0084] Specifically, in the two-step molding process for preparing the transition zone geomembrane 3, the resin material (resin granules) and other materials (powder) are first mixed evenly, then extruded and granulated using a twin-screw extruder. The resulting mixed granules are then transferred to a single-screw extruder for further extrusion molding. This process is primarily used to prepare the transition zone geomembrane. When the transition zone geomembrane includes a support layer, the membrane extruded from the twin-screw extruder can be hot-pressed and bonded with the support layer to obtain the transition zone geomembrane 3.

[0085] In the process of forming the resin layer through a two-step molding method, the barrel temperature of the twin-screw extruder can be 165-195℃, such as 165℃, 170℃, 175℃, 180℃, 185℃, 190℃, 195℃ or any combination thereof, specifically ensuring that the melt temperature does not exceed 230℃.

[0086] Furthermore, during the process of forming the resin layer by the two-step molding method, the barrel temperature of the single screw extruder can be 175-190°C, for example, 165°C, 170°C, 175°C, 180°C, 185°C, 190°C, 195°C or any combination thereof, and the die temperature can be 180-185°C.

[0087] Specifically, the process of preparing the transition zone geomembrane material using a two-step molding method may include:

[0088] S1: The resin granules and powder are mixed evenly using a high-speed mixer, and then sheared and blended extruded into granules using a twin-screw extruder (using a round die). The resin granules are fed from the feed port at the beginning of the screw, and the powder is fed from the side feed port. The extruded strips are cooled by circulating water in a water tank, drawn, air-dried, granulated, dried, homogenized, and collected to obtain mixed granules. The barrel temperature of the twin-screw extruder is set at 165-195℃ to ensure that the melt temperature does not exceed 230℃.

[0089] S2: (a) Preparation of homogeneous transition zone geomembrane 3: The formulated granules collected in S1 are transferred to a single-screw extruder, fed from the feed port at the beginning of the screw, conveyed by the screw, extruded through the die, calendered and sized by three-roll milling, trimmed, cut to length, wound, and packaged to obtain homogeneous transition zone geomembrane 3 (i.e., homogeneous transition zone geomembrane); wherein, the barrel temperature of the single-screw extruder is set to 175-190℃, and the die temperature is set to 180-185℃; (b) Preparation of composite Transition zone impermeable material 3: The mixed granules collected in S1 are transferred to a single-screw extruder and fed from the feed port at the beginning of the screw. At the same time, the support layer is unwound from the back of the three rolls and wound to the front of the three rolls. Together with the raw material extruded from the die, it enters the middle and lower rolls for hot pressing and thickness determination. After edge trimming, length cutting, and winding, a composite film material after the resin layer and support layer are obtained. The barrel temperature of the single-screw extruder is set to 175-190℃, and the die temperature is set to 180-185℃.

[0090] Among them, when the support layer (e.g., non-woven fabric) has a resin layer on one side, a step (b) is performed to composite the resin layer on one side of the support layer, and the resulting composite membrane material is the composite transition zone geomembrane material (composite (backed) transition zone geomembrane material) 3.

[0091] When the support layer (e.g., mesh fabric) has resin layers on both sides (hereinafter referred to as the first side and the second side of the support layer), step (b) is performed first to laminate the resin layer on the first side of the support layer. Then, the obtained composite membrane is unwound and reversed, and step (b) is repeated (i.e., the mixed granules collected in S1 are transferred to a single screw extruder, fed from the feed port at the beginning of the screw, and the composite membrane is unwound from the back of the three rolls and wound to the front of the three rolls, and enters the middle and lower rolls together with the raw material extruded from the die for hot pressing and thickness setting, and then undergoes edge trimming, length cutting, and winding) to laminate the resin layer on the second side of the composite membrane, thus obtaining the composite transition zone waterproof material 3.

[0092] After the transition zone impermeable material 3 is prepared through the above preparation process, it can be packaged or otherwise processed as needed, without any particular restrictions.

[0093] In the embodiments of the present invention, unless otherwise specified, the twin-screw extruder, single-screw extruder, rollers and other equipment or components used can be conventional equipment or components in the art. The processes involved, such as circulating water cooling, air drying, fixed-length cutting, drying, collection, as well as three-roll calendering for thickness setting, edge trimming, winding and packaging, are all conventional operations in the art and are not particularly limited thereto.

[0094] In this embodiment of the invention, the powder refers to other materials besides resin materials used to form the resin layer. As mentioned above, the resin materials include polyethylene resin, polypropylene resin and olefin block copolymer resin, and the powder includes fillers and fluxes. In addition, the powder may also include antioxidants, light stabilizers and pigments, etc.

[0095] This invention also provides an application of the above-mentioned transition zone impermeable material 3 in welding HDPE geomembrane 1 and TPO geomembrane 2.

[0096] In application, the transition zone seepage-proof material of this invention can be welded between HDPE geomembrane 1 and TPO geomembrane 2 to form a combined geomembrane seepage-proof system, such as... Figure 1 and Figure 2 As shown, the combined geomembrane seepage prevention system includes HDPE geomembrane 1, TPO geomembrane 2, and transition strip seepage prevention material 3 connecting HDPE geomembrane 1 and TPO geomembrane 2. HDPE geomembrane 1 and TPO geomembrane 2 are connected by transition strip seepage prevention material 3 to form at least one connection part (joint). The peel strength F1 of each connection part is greater than or equal to 6N / mm (i.e., F1≥6N / mm). Specifically, for each connection part, in the peel strength versus displacement curve of the connection part, there is a curve segment with a peel strength greater than or equal to 6N / mm in the range where the displacement exceeds 100mm.

[0097] In this embodiment of the invention, the combined geomembrane seepage prevention system formed by welding HDPE geomembrane 1 and TPO geomembrane 2 using the aforementioned transition zone seepage prevention material has a large bonding strength between HDPE geomembrane 1 and TPO geomembrane 2 (F1≥6N / mm, and for each joint, in the peel strength versus displacement curve of that joint, there is a curve segment with a peel strength greater than or equal to 6N / mm in the displacement range exceeding 100mm), giving it good connection reliability. The joint between the two can adapt to deformation caused by factors such as water pressure or base settlement, and is not easily pulled apart or damaged during service. This improves the seepage prevention reliability of the combined geomembrane seepage prevention system formed by connecting HDPE geomembrane 1 and TPO geomembrane 2, avoids joint leakage and other problems during use, and thus forms a reliable and complete seepage prevention and sealing system, ensuring project quality.

[0098] In this embodiment of the invention, HDPE geomembrane 1 and TPO geomembrane 2 are connected by a transition strip impermeable material 3. The peel strength F1 of the resulting joint is greater than or equal to 6 N / mm. For each joint, in the peel strength versus displacement curve, there is a segment where the peel strength is greater than or equal to 6 N / mm in the displacement range exceeding 100 mm. This is significantly improved (at least doubled) compared to the peel strength of welds formed by directly welding HDPE geomembrane 1 and TPO geomembrane 2 (≤3 N / mm) and the peel strength of joints formed by adhesive overlap (≤3 N / mm), thus significantly improving the reliability of impermeability. At the same time, compared to the connection method of rigid anchoring combined with edge sealing, this embodiment of the invention connects HDPE geomembrane 1 and TPO geomembrane 2 by a transition strip impermeable material 3, which is a non-destructive anchoring method. This can improve the sealing performance of the connection part (connection anchorage) and has the advantages of simple process and easy operation.

[0099] In this embodiment of the invention, the HDPE geomembrane 1 and TPO geomembrane 2 are connected by a transition strip impermeable material 3 by welding (i.e., the connection described above is welding). Accordingly, the connection formed by welding (connecting) the HDPE geomembrane 1 and TPO geomembrane 2 through the transition strip impermeable material 3 is the welded part of the two (i.e., the joint described above is a weld). That is, in the combined geomembrane impermeable system, the HDPE geomembrane 1 and TPO geomembrane 2 are welded through the transition strip impermeable material 3 to form at least one welded part (weld). The peel strength F1 of each welded part is greater than or equal to 6 N / mm (i.e., F1≥6 N / mm), and for each welded part, in the peel strength versus displacement curve of that welded part, there is a curve segment with a peel strength greater than or equal to 6 N / mm in the range where the displacement exceeds 100 mm.

[0100] In this embodiment of the invention, the welding can be a single-seam welding, double-seam welding, or extrusion pressure welding, etc., and the appropriate method can be selected as needed during implementation.

[0101] In this embodiment of the invention, a conventional single-seam welding machine in the art can be used for single-seam welding, a conventional double-seam welding machine in the art can be used for double-seam welding, and a conventional extrusion welding gun can be used for extrusion pressure welding. For example, a Swiss Leister Varimat V hot air automatic welding machine can be used for single-seam welding, a Swiss Leister Twinny T hot air / hot wedge combined dual-rail automatic welding machine can be used for double-seam welding, and a Leister Fusion 2 handheld extrusion welding gun can be used for extrusion pressure welding.

[0102] This invention is applicable to various welding methods, whether single-seam or double-seam welding. By using the aforementioned transition zone impermeable material to weld HDPE geomembrane 1 and TPO geomembrane 2, a large welding strength can be achieved between HDPE geomembrane 1 and TPO geomembrane 2 (F1≥6N / mm, and for each welded part, in the peel strength versus displacement curve of that welded part, there is a curve segment with a peel strength greater than or equal to 6N / mm in the displacement range exceeding 100mm). The weld between the two is not easily pulled apart or damaged during service, which can improve the impermeability reliability of the combined geomembrane impermeable system and avoid problems such as weld leakage during use.

[0103] Under normal circumstances, such as Figure 1 and Figure 2 The aforementioned connection (welding part) extends in the second direction y, which is substantially perpendicular to the direction along the HDPE geomembrane 1 to the TPO geomembrane 2.

[0104] Specifically, the combined geomembrane seepage prevention system structure formed by welding HDPE geomembrane 1 and TPO geomembrane 2 using transition zone seepage prevention materials can be as follows: Figure 1 As shown, at least one connection point as described above may include a first connection point 301 between the transition zone impermeable material 3 and the HDPE geomembrane 1, and a second connection point 302 between the transition zone impermeable material 3 and the TPO geomembrane 2.

[0105] Specifically, such as Figure 1 As shown, the first connection part 301 can be a first welded part formed by welding the transition strip impermeable material 3 and the HDPE geomembrane 1 (that is, after the transition strip impermeable material 3 and the HDPE geomembrane 1 are overlapped, the overlap part of the two is welded to form the first welded part), and the second connection part 302 can be a second welded part formed by welding the transition strip impermeable material 3 and the TPO geomembrane 2 (that is, after the transition strip impermeable material 3 and the TPO geomembrane 2 are overlapped, the overlap part of the two is welded to form the first welded part).

[0106] In this embodiment of the invention, in the combined geomembrane seepage control system, the transition zone seepage control material 3 can serve as a transition zone seepage control membrane material connecting the HDPE geomembrane 1 and the TPO geomembrane 2 (e.g., Figure 1As shown in the diagram, one side of the transition strip impermeable material 3 is connected to the HDPE geomembrane 1 to form the first connection part 301, and the other side of the transition strip impermeable material 3 is connected to the TPO geomembrane 2 to form the second connection part 302. That is, in the combined geomembrane impermeable system, the HDPE geomembrane 1 and the TPO geomembrane 2 are connected by the transition strip impermeable material 3 to form two connection parts, namely the first connection part 301 and the second connection part 302. The peel strength F1 of the first connection part 301 and the second connection part 302 are both greater than or equal to 6N / mm. In the peel strength variation curve of the first connection part 301 with displacement, there is a curve segment with peel strength greater than or equal to 6N / mm in the range where the displacement exceeds 100mm. In the peel strength variation curve of the second connection part 302 with displacement, there is a curve segment with peel strength greater than or equal to 6N / mm in the range where the displacement exceeds 100mm.

[0107] Continue to refer to Figure 1 When the transition zone impermeable material 3 is used as a transition zone impermeable membrane material to connect the HDPE geomembrane 1 and the TPO geomembrane 2, the transition zone impermeable material 3 may also include a body part 300 located between the first connection part 301 and the second connection part 302. This body part 300 is a part of the transition zone impermeable material 3 that exists independently and is not welded to the HDPE geomembrane 1 or the TPO geomembrane 2.

[0108] Specifically, when the transition zone impermeable material 3 is used as the transition zone impermeable membrane material to connect the HDPE geomembrane 1 and the TPO geomembrane 2 (e.g.) Figure 1 As shown), the transition zone impermeable material 3 can be welded to the HDPE geomembrane 1 and TPO geomembrane 2 respectively. Specifically, single-seam welding or double-seam welding can be used to form the first connection part 301 (first welding part) and the second connection part 302 (second welding part).

[0109] Or, such as Figure 2 As shown, at least one connection point as described above is a third connection point 303. The third connection point 303 can be a third welded part formed by welding HDPE geomembrane 1 and TPO geomembrane 2 with transition zone impermeable material 3 (that is, after overlapping the part to be welded of HDPE geomembrane 1, the part to be welded of TPO geomembrane 2 and transition zone impermeable material 3, the overlapping part of the three is welded to form the third welded part).

[0110] Specifically, the transition zone impermeable material 3 can be used as an edge sealing welding rod at the overlapping edge of HDPE geomembrane 1 and TPO geomembrane 2 (e.g., Figure 2As shown), at this time, HDPE geomembrane 1 and TPO geomembrane 2 are connected by transition zone impermeable material 3 to form a third connection part, which can be formed by extrusion welding (third welded part).

[0111] like Figure 2 As shown, at the third connection portion 303, at least a portion of the transition zone impermeable material 3 covers one of the HDPE geomembrane 1 and TPO geomembrane 2 (hereinafter referred to as the first one), and at least a portion of the transition zone impermeable material 3 covers the edge of the other of the HDPE geomembrane 1 and TPO geomembrane 2 (hereinafter referred to as the second one).

[0112] Specifically, such as Figure 2 As shown, the first one can be HDPE geomembrane 1, and the second one is TPO geomembrane 2.

[0113] Continue to refer to Figure 2 HDPE geomembrane 1 and TPO geomembrane 2 overlap, and the overlap area includes a fourth connection portion 4 of HDPE geomembrane 1 and TPO geomembrane 2. This fourth connection portion 4 can specifically be a fourth welded portion formed by welding HDPE geomembrane 1 and TPO geomembrane 2, for example, through single-seam or double-seam welding. The first component includes a main body area on one side of the fourth connection portion 4 in the first direction x, and an edge area on the other side of the fourth connection portion 4 in the first direction x. This edge area overlaps the surface of the second component. A portion of the transition strip impermeable material 3 covers this edge area, and another portion covers the second component, thus sealing and reinforcing the first and second components with the transition strip impermeable material 3. The first direction x is substantially parallel to the direction along the HDPE geomembrane 1 to TPO geomembrane 2.

[0114] In specific implementation, after welding HDPE geomembrane 1 and TPO geomembrane 2 to form the fourth welding position, the transition strip seepage prevention material 3 (sealing welding rod) is covered on the edge area of ​​the first and second parts of HDPE geomembrane 1 and TPO geomembrane 2 (that is, the welding part of HDPE geomembrane 1, the welding part of TPO geomembrane 2 and the transition strip seepage prevention material 3 are overlapped), and the overlapping part of the three is welded to form the third welding position, thereby achieving edge sealing and seepage prevention reinforcement of the weld seam of HDPE geomembrane 1 and TPO geomembrane 2.

[0115] In this embodiment of the invention, the peel strength (or weld peel strength, also the peel strength of the connection between the transition zone impermeable material and the HDPE geomembrane 1 and TPO geomembrane 2 through the transition zone impermeable material 3) and the peel strength versus displacement curve can be determined according to GB / T According to the provisions of 328.21-2007 "Test Methods for Waterproofing Membranes - Part 21: Peel Strength of Polymer Waterproofing Membranes", specifically, when testing the peel strength of a certain joint, a test specimen including the joint is cut from a composite geomembrane waterproofing system. In the test specimen, HDPE geomembrane 1 and TPO geomembrane 2 of appropriate width are respectively retained on both sides of the joint (the joint is located between the retained HDPE geomembrane 1 and TPO geomembrane 2). Then, the peel strength of the test specimen is tested. During the test, one side of the test specimen in the first direction x is fixed, and the geomembrane on the other side of the test specimen is clamped with a clamp and stretched outward. The stretching speed can be 100 mm / min, so as to measure the peel strength F1 of the joint.

[0116] Specifically, during the peel strength test, a peel strength curve (i.e., the peel strength as a function of displacement (clamp displacement)) can be obtained.

[0117] In this embodiment of the invention, the peel strength F1 of the connection part refers to the maximum peel strength, that is, the maximum peel strength value (maximum peak value) in the peel strength curve.

[0118] Specifically, for any connection part, its peel strength curve generally has at least one (or more) peaks. Correspondingly, the peel strength curve has at least one peak value (the peel strength corresponding to the highest point of the peak). When it has one peak value, the peel strength corresponding to that peak value is the maximum peel strength F1. When it has multiple peak values, the peel strength corresponding to the peak value with the largest peel strength among these peak values ​​is the maximum peel strength F1.

[0119] Specifically, for any connection part (such as the first connection part 301, the second connection part 302, or the third connection part 303), its peel strength curve may include one or more peaks, and the peel strength corresponding to these peaks is greater than or equal to 6N / mm, and may be greater than or equal to 8N / mm, for example, greater than or equal to 10N / mm.

[0120] In some embodiments, the peel strength curve of the first connection portion 301 includes three peaks, and the peel strength corresponding to these three peaks is greater than or equal to 6 N / mm, further greater than or equal to 8 N / mm, and even further greater than or equal to 10 N / mm. In this case, the first connection portion 301 can specifically be formed by welding the transition zone impermeable material 3 and the HDPE geomembrane 1 together with a single seam.

[0121] For example, the displacements corresponding to the three peaks mentioned above can be S1, S2, and S3, respectively, with 30mm≤S1≤50mm, 70mm≤S2≤100mm, and 120mm≤S3≤150mm, but not limited to these values.

[0122] Specifically, the hardness of the transition zone geomembrane 3 can be less than that of the HDPE geomembrane 1, while the hardness of the transition zone geomembrane 3 can be greater than that of the TPO geomembrane 2. During the tensile process of the transition zone geomembrane 3 and the HDPE geomembrane 1, the deformation is mainly concentrated on the transition zone geomembrane 3, while during the tensile process of the transition zone geomembrane 3 and the TPO geomembrane 2, the deformation is mainly concentrated on the TPO geomembrane 2. The HDPE geomembrane 1 has yield characteristics, and deformation concentration is easily generated on one side of the weld, leading to tearing within a short distance. In contrast, the TPO geomembrane 2 has strong multi-directional deformation adaptability and uniform deformation, and deformation concentration is not easily generated at the weld edge. Connecting the HDPE geomembrane 1 and the TPO geomembrane 2 through the transition zone geomembrane 3 facilitates the transfer of deformation to the material with strong deformation adaptability in the combined geomembrane ...

[0123] In some embodiments, the hardness of the transition zone waterproofing material 3 is between 40 and 55 Shore D.

[0124] Generally, the hardness of HDPE geomembrane 1 is greater than or equal to 55 Shore D, and the hardness of TPO geomembrane 2 is less than or equal to 40 Shore D.

[0125] In this embodiment of the invention, HDPE geomembrane 1 (high-density polyethylene geomembrane) can be conventional HDPE geomembrane 1 in the art, and TPO geomembrane 2 (thermoplastic polyolefin geomembrane) can be conventional TPO geomembrane 2 in the art. Both can be obtained by conventional methods in the art, such as commercial purchase or self-made by conventional methods in the art, and there are no special restrictions on this.

[0126] The present invention will be further described below through specific embodiments. In the following embodiments and comparative examples, unless otherwise specified, a Swiss Leister Varimat V hot air automatic welding machine is used for single-seam welding, with a temperature and speed of 500°C and 2.5 m / min, respectively; a Swiss Leister Twinny T hot air / hot wedge combined dual-rail automatic welding machine is used for double-seam welding, with a temperature and speed of 270°C and 2.4 m / min, respectively.

[0127] Unless otherwise specified, in the following examples and comparative examples, the metallocene medium-density polyethylene used was Sinopec's mPE E332H, the high-density polyethylene was Sinopec's TR144, the linear low-density polyethylene was ExxonMobil's ExceedS 9243ML, the reactive grade TPO was LyondellBasell's Hifax CA 10A, the C3 / C2 binary copolymer polypropylene was Sinopec's B9302, the homopolymer polypropylene was Sinopec's M02d, the ethylene / α-octene block copolymer was Dow Chemical's Infuse 9100, the propylene / ethylene block copolymer was Dow Chemical's Intune d5535, the calcium carbonate was Omyacarb 6 from Omya Calcium Industry, the antioxidant was BASF's Irganox B 225, and the light stabilizer was BASF's Chimassorb. In 2020, the pigment (titanium dioxide) was LR-972 from Longmang Titanium Industry, the polymerized rosin was POLY-PALE from Eastman, the rosin ester was Sylvalite RE 105L from Kraton, and the hydrogenated rosin was AX-E from Eastman.

[0128] Example 1

[0129] In this embodiment 1, the formulation of the transition zone seepage prevention material is shown in Table 1.

[0130] Table 1 Formulation of Transition Zone Impermeable Materials

[0131] Raw material type Specific raw materials weight ratio Polyethylene resin Metallocene medium-density polyethylene 36 copies Flexible polypropylene resin Reactive TPO 25 copies olefin block copolymer resin Ethylene / α-octene block copolymer 15 copies olefin block copolymer resin propylene / ethylene block copolymer 8 copies filler Calcium carbonate 10 copies flux Polymerized rosin 1.5 copies flux Hydrogenated rosin 1.5 copies antioxidants Irganox B 225 0.5 copies Light stabilizers Chimassorb 2020 0.5 copies pigment Titanium dioxide 2 copies

[0132] Example 2

[0133] In this embodiment 2, the formulation of the transition zone seepage prevention material is shown in Table 2.

[0134] Table 2 Formulation of Transition Zone Impermeable Materials

[0135] Raw material type Specific raw materials weight ratio Polyethylene resin Metallocene medium-density polyethylene 37 copies Flexible polypropylene resin Reactive TPO 15 copies Flexible polypropylene resin <![CDATA[C3 / C2 binary copolymer polypropylene]]> 6 copies olefin block copolymer resin Ethylene / α-octene block copolymer 15 copies filler Calcium carbonate 20 copies flux Hydrogenated rosin 4 copies antioxidants Irganox B 225 0.5 copies Light stabilizers Chimassorb 2020 0.5 copies pigment Titanium dioxide 2 copies

[0136] Example 3

[0137] In this embodiment 3, the formulation of the transition zone seepage prevention material is shown in Table 3.

[0138] Table 3 Formulation of Transition Zone Impermeable Materials

[0139] Raw material type Specific raw materials weight ratio Polyethylene resin High-density polyethylene 23 copies Polyethylene resin Linear low-density polyethylene 5 copies Flexible polypropylene resin Reactive TPO 14 copies Flexible polypropylene resin Homopolymer polypropylene 5 copies olefin block copolymer resin propylene / ethylene block copolymer 15 copies filler Calcium carbonate 30 copies flux Rosin ester 5 copies antioxidants Irganox B 225 0.5 copies Light stabilizers Chimassorb 2020 0.5 copies pigment Titanium dioxide 2 copies

[0140] Comparative Example 1: The difference from Example 1 is that Comparative Example 1 does not use a transitional impermeable material, but directly connects the HDPE geomembrane and TPO geomembrane by welding.

[0141] Comparative Example 2

[0142] In Comparative Example 2, the formulation of the transition zone impermeable material is shown in Table 4.

[0143] Table 4 Formulation of Transition Zone Impermeable Materials

[0144] Raw material type Specific raw materials weight ratio Polyethylene resin Metallocene medium-density polyethylene 40 copies Flexible polypropylene resin Reactive TPO 30 copies olefin block copolymer resin Ethylene / α-octene block copolymer 18 copies olefin block copolymer resin propylene / ethylene block copolymer 11 copies antioxidants Irganox B 225 0.5 copies Light stabilizers Chimassorb 2020 0.5 copies

[0145] Comparative Example 3

[0146] In Comparative Example 3, the formulation of the transition zone impermeable material is shown in Table 5.

[0147] Table 5 Formulation of Transition Zone Impermeable Materials

[0148] Raw material type Specific raw materials weight ratio Polyethylene resin Linear low-density polyethylene 82 copies filler Calcium carbonate 15 copies antioxidants Irganox B 225 0.5 copies Light stabilizers Chimassorb 2020 0.5 copies pigment Titanium dioxide 2 copies

[0149] HDPE geomembrane and TPO geomembrane were welded using the transition zone impermeable materials of Examples 1 to 3, Comparative Examples 2 and 3, respectively, and the peel strength was tested.

[0150] Test Example 1

[0151] The preparation process of the homogeneous transition zone geomembrane material in Examples 1 to 3 and Comparative Examples 2 and 3 is as follows: The resin granules and powder in the formula are mixed evenly using a high-speed mixer, and shear-blended extrusion is performed using a twin-screw extruder with a flat extrusion die; wherein, the resin granules are fed from the feed port at the beginning of the screw, and the powder is fed from the side feed port; the barrel temperature of the twin-screw extruder is set to 165-195℃ to ensure that the melt temperature does not exceed 230℃; the sheet extruded from the die is directly fed into a three-roll calender for thickness determination, and then trimmed, cut to length, etc., to obtain the homogeneous transition zone geomembrane material.

[0152] The peel strength of the weld seam (first connection point) between the homogeneous transition zone geomembrane material and the HDPE geomembrane in Examples 1-3, Comparative Examples 2 and 3 was tested according to the following procedure:

[0153] (1) Welding: Cut two 300mm×200mm samples (one transition zone geomembrane and one HDPE geomembrane), wipe the welding surface of the membrane clean with anhydrous ethanol; use an automatic welding machine on the rock wool workbench to weld the overlapping edges of the two samples tightly, and use a hook to check for any false welds or missing welds.

[0154] (2) Peel strength test: After the weld has cooled, according to the provisions of GB / T 328.21-2007 "Test methods for waterproof membranes - Part 21: Peel performance of joints of polymer waterproof membranes", a rectangular specimen with a width of 50 mm is cut to test the weld peel strength and peel strength curve. The tensile speed is 100 mm / min.

[0155] In addition, two 300mm×200mm samples (one transition zone geomembrane and one TPO geomembrane) were cut and the weld (second connection part) of the homogeneous transition zone geomembrane and TPO geomembrane in Examples 1 to 4 and Comparative Example 2 was tested respectively, referring to the above welding and peel strength test process.

[0156] In addition, in Comparative Example 1, two 300mm × 200mm samples (one HDPE geomembrane and one TPO geomembrane) were cut, and the weld peel strength of the direct weld between the HDPE geomembrane and the TPO geomembrane was tested according to the above welding and peel strength test procedure. The peel strength of a single-seam weld between the HDPE geomembrane and the TPO geomembrane was approximately 2 N / mm, and the peel strength of a double-seam weld was approximately 3 N / mm.

[0157] In this process, single-seam welding is performed according to step (1), and then peel strength test is performed in step (2). The weld peel strength (single weld peel strength) F1 of the single-seam weld between the transition zone seepage prevention material and the HDPE geomembrane is shown in Table 1. Double-seam welding is performed according to step (2), and then peel strength test is performed in step (2). The weld peel strength (double weld peel strength) F1 of the double-seam weld between the transition zone seepage prevention material and the HDPE geomembrane is shown in Table 6.

[0158] in addition, Figure 3The peel strength curves of single-seam welds between the transition zone geomembrane and TPO geomembrane of Example 1 are shown (Example 1 / TPO single seam), the peel strength curves of single-seam welds between the transition zone geomembrane and HDPE geomembrane of Example 1 (Example 1 / HDPE single seam), the peel strength curves of double-seam welds between the transition zone geomembrane and TPO geomembrane of Example 1 (Example 1 / TPO double seam), the peel strength curves of double-seam welds between the transition zone geomembrane and HDPE geomembrane of Example 1 (Example 1 / HDPE double seam), the peel strength curves of single-seam welds between HDPE geomembrane and TPO geomembrane of Comparative Example 1 (HDPE / TPO single seam (Comparative Example 1)), and the peel strength curves of double-seam welds between HDPE geomembrane and TPO geomembrane of Comparative Example 1 (HDPE / TPO double seam (Comparative Example 1)).

[0159] in addition, Figure 4 The peel strength curves of the transition zone impermeable material and the HDPE geomembrane of Example 1 (Example 1 / HDPE single seam) and the peel strength curves of the transition zone impermeable material and the HDPE geomembrane of Comparative Example 2 (Comparative Example 2 / HDPE single seam) are shown.

[0160] in addition, Figure 5 The peel strength curves of the transition zone impermeable material and TPO geomembrane of Example 1 with single-slit welding (Example 1 / TPO single-slit), the peel strength curves of the transition zone impermeable material and TPO geomembrane of Example 1 with double-slit welding (Example 1 / TPO double-slit), the peel strength curves of the transition zone impermeable material and TPO geomembrane of Comparative Example 3 with single-slit welding (Comparative Example 3 / TPO single-slit), and the peel strength curves of the transition zone impermeable material and TPO geomembrane of Comparative Example 3 with double-slit welding (Comparative Example 3 / TPO double-slit) are shown.

[0161] In addition, the Shore hardness of the transition zone geomembrane materials of Examples 1 to 3, Comparative Examples 2 and 3 was measured and is shown in Table 6.

[0162] Table 6 Peel strength test results

[0163]

[0164]

[0165] According to the peel strength and peel strength curve test results, compared with Comparative Examples 1, 2, and 3, in Examples 1 to 3, the peel strength F1 between the transition zone geomembrane and the HDPE geomembrane, and between the transition zone geomembrane and the TPO geomembrane, both reached 6 N / mm or higher. Furthermore, in the peel strength curve of the transition zone geomembrane versus displacement, there exists a segment with a peel strength greater than or equal to 6 N / mm in the displacement range exceeding 100 mm, and similarly, in the peel strength curve of the transition zone geomembrane versus displacement, there exists a segment with a peel strength greater than or equal to 6 N / mm in the displacement range exceeding 100 mm (specifically in…). Figures 3 to 6 The peel strength curves of Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 are shown in the figure, indicating that the transition zone geomembrane exhibits good welding strength with both HDPE and TPO geomembranes. This demonstrates that the transition zone geomembrane of the present invention can be applied to welding HDPE and TPO geomembranes, improving the welding strength of HDPE and TPO geomembranes, and thus enhancing the seepage prevention reliability of the combined geomembrane geomembrane seepage prevention system.

[0166] Furthermore, compared to Comparative Example 2, Examples 1 to 3 introduce fillers and other components into the transition zone waterproofing material, which can increase the surface roughness of the transition zone waterproofing material, reduce its melt flow during welding, reduce the thinning phenomenon of weld edges, and further improve welding reliability.

[0167] Further integration Figure 3 and Figure 4 As can be seen, the peel strength curve of Example 1 has three peaks, and the peel strength of each peak is greater than 10 N / mm. The peel strength curve of Comparative Example 2 has a peak with a peel strength exceeding 6 N / mm. After the jig displacement exceeds 20 mm, the peel strength is lower than 6 N / mm. The reason for this is that the welded part of Comparative Example 2 has a local problem of incomplete welding. Compared with Comparative Example 2, Examples 1 to 3 show better welding reliability.

[0168] Test Example 2

[0169] The preparation process of the transition band material for forming the edge sealing electrode in Example 1 is as follows: The resin granules and powder in the formula are mixed evenly in a high-speed mixer, and sheared and blended extrusion granulation is performed using a twin-screw extruder with a round die; wherein, the resin granules are fed from the feed port at the beginning of the screw, and the powder is fed from the side feed port; the strip extruded from the die is cooled by circulating water in a water tank, drawn, air-dried, cut to length, and dried to obtain the transition band material for forming the edge sealing electrode; the barrel temperature of the twin-screw extruder is set to 165-195℃ to ensure that the melt temperature does not exceed 230℃; the electrode diameter is controlled to about 3-4mm by controlling the ratio of extrusion volume to traction speed.

[0170] Following the procedure below, the transition strip material of Example 1 was used to seal and weld the HDPE geomembrane and TPO geomembrane, and the peel strength of the weld (third connection part) was tested: Two 300mm×200mm samples (one HDPE geomembrane and one TPO geomembrane) were cut, and the welded surfaces of the membranes were wiped clean with anhydrous ethanol; the edges of the two samples were aligned on the rock wool worktable, and then they were moved and staggered to overlap (e.g., Figure 2 (As shown); Above the staggered joint, a Swiss Leister Fusion2 handheld extrusion welding gun was used to extrude welding rods to seal the staggered joint. After extrusion, the welding rods formed a 50cm wide, gel-like strip, with half of the strip covering the HDPE geomembrane and the other half covering the TPO geomembrane. A hook was used to check for any incomplete welds or missed welds. After the weld cooled, according to GB / T328.21-2007 "Test Methods for Waterproofing Membranes - Part 21: Peel Strength of Polymer Waterproofing Membranes", 50mm wide rectangular specimens were cut for weld peel strength testing. The temperature of the handheld extrusion welding gun was set to 450℃.

[0171] The measured peel strength of the third bonding region was approximately 10 N / mm (bonding). Figure 6 As can be seen, the peel strength at the third connection point is slightly greater than 10 N / mm. Figure 6 The peel strength curves corresponding to the third connection part of Example 1 (electrode / TPO & HDPE of Example 1), the peel strength curves of the single-seam weld of HDPE geomembrane and TPO geomembrane of Comparative Example 1 (HDPE / TPO single seam (Comparative Example 1)), and the peel strength curves of the double-seam weld of HDPE geomembrane and TPO geomembrane of Comparative Example 1 (HDPE / TPO double seam (Comparative Example 1)) are shown.

[0172] The test results show that by using the transition strip material of Example 1 to extrude and weld the overlapping area of ​​HDPE geomembrane and TPO geomembrane, the seepage prevention reliability at the connection between HDPE and TPO geomembrane can be greatly improved. The transition strip seepage prevention material of this embodiment can be used as an edge sealing welding rod, which is suitable for extruding and welding the outer edge of the welded edge of HDPE and TPO geomembrane, thereby improving the seepage prevention reliability of the combined geomembrane seepage prevention system.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transition zone impervious material characterized in that, The transition zone impervious material comprises a resin film layer, the resin film layer comprises polyethylene resin, polypropylene resin, olefin block copolymer resin, filler and flux, the flux comprises rosin material; the transition zone impervious material satisfies: In the curve of the peel strength of the transition zone impervious material and HDPE geomembrane with displacement, there is a curve segment with peel strength greater than or equal to 6 N / mm in the interval where the displacement is more than 30 mm; In the curve of the peel strength of the transition zone impervious material and TPO geomembrane with displacement, there is a curve segment with peel strength greater than or equal to 6 N / mm in the interval where the displacement is more than 30 mm; The mass ratio of the polyethylene resin in the resin film layer is 25%-60%; The mass ratio of the polypropylene resin in the resin film layer is 12%-38%; The mass ratio of the olefin block copolymer resin in the resin film layer is 4%-26%; The mass ratio of the filler in the resin film layer is 10%-40%; The mass ratio of the flux in the resin film layer is 0.1%-8%; The polyethylene resin comprises one or more of high-density polyethylene, medium-density polyethylene and linear low-density polyethylene; The polyethylene resin has a density between 0.920 and 0.955 g / cm 3 a melt index at 190°C, 2.16 kg between 0.15 and 4.0 g / 10 min; The polypropylene resin comprises one or more of propylene / ethylene / butene terpolymer polypropylene, propylene / ethylene binary copolymer polypropylene and homopolymer polypropylene; The polypropylene resin has a density between 0.850 and 0.930 g / cm 3 a melt index between 0.3 and 3.5 g / 10 min at 230°C, 2.16 kg. The olefin block copolymer resin includes one or more of an ethylene / alpha-octene block copolymer, a propylene / ethylene block copolymer; the ethylene / alpha-octene block copolymer has a density between 0.860 and 0.890 g / cm 3 at 190°C, 2.16 KG, between 0.3 and 5.0; the propylene / ethylene block copolymer has a density between 0.870 and 0.910 g / cm 3 at 230°C, 2.16 KG, between 6.0 and 10.0; The filler comprises one or more of calcium carbonate, talcum powder, calcined kaolin and calcite; The rosin material comprises one or more of polymerized rosin, rosin ester and hydrogenated rosin; The transition zone impervious material is the resin film layer, or the transition zone impervious material further comprises a support layer compounded with the resin film layer, and the support layer comprises non-woven fabric and / or mesh cloth.

2. The transition zone impervious material according to claim 1, wherein, In the curve of the peel strength of the transition zone impervious material and HDPE geomembrane with displacement, there is a curve segment with peel strength greater than or equal to 6 N / mm in the interval where the displacement is more than 50 mm; And / or, in the curve of the peel strength of the transition zone impervious material and TPO geomembrane with displacement, there is a curve segment with peel strength greater than or equal to 6 N / mm in the interval where the displacement is more than 50 mm.

3. The transition zone barrier material of claim 1 or 2, wherein, The resin film layer further comprises antioxidant, light stabilizer and pigment, and the mass fractions of the components of the resin film layer are as follows: the polyethylene resin is 25-60 parts, the polypropylene resin is 12-38 parts, the olefin block copolymer is 4-26 parts, the filler is 10-40 parts, the flux is 0.1-8 parts, the antioxidant is 0.1-2 parts, the light stabilizer is 0.1-2 parts, and the pigment is 0.1-5 parts.

4. The transition zone impervious material according to claim 3, wherein, The antioxidant comprises organic phosphite and / or hindered phenolic antioxidant; And / or, the light stabilizer comprises hindered amine light stabilizer. And / or, the pigments include one or more of titanium dioxide (TiO2), carbon black, iron oxide, Prussian blue, lead silicate, monoazo, disazo, phthalocyanine.

5. The transition zone impervious material according to claim 1 or 2, wherein, the hardness of the transition zone impervious material is less than the hardness of the HDPE geomembrane, the hardness of the transition zone impervious material is greater than the hardness of the TPO geomembrane; and / or, the hardness of the transition zone impervious material is between 40-55 Shore D; and / or, the transition zone impervious material is a sealing strip or a transition zone impervious film.

6. A method of producing the transition zone impervious material of any one of claims 1-5, characterized in that, The method comprises the following steps: extruding the material for forming the resin film layer to form the resin film layer, thereby preparing the transition zone impervious material.

7. The method for preparing the transition zone impervious material according to claim 6, wherein, the process of extruding the material for forming the resin film layer comprises: extruding the material for forming the resin film layer through a double-screw extruder to form the resin film layer, thereby preparing the transition zone impervious material; or, the process of extruding the material for forming the resin film layer comprises: extruding the material for forming the resin film layer through a double-screw extruder to form granules, and then extruding the granules through a single-screw extruder to form the resin film layer, thereby preparing the transition zone impervious material; and / or, the transition zone impervious material further comprises a support layer combined with the resin film layer, the support layer comprises non-woven fabric and / or mesh fabric; and the process for preparing the transition zone impervious material further comprises a process of combining the resin film layer with the support layer.

8. Use of the transition zone impervious material according to any one of claims 1-5 in welding HDPE geomembrane and TPO geomembrane.

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