Self-hanging type high-strength acid and alkali resistant anti-seepage liner

Abstract

The invention relates to the technical field of anti-seepage liners, and discloses a composite anti-seepage liner and a self-hanging type adhesive tape, the composite anti-seepage liner is formed by compounding PP (polypropylene) geotextile protective layers and PE (polyethylene) anti-seepage layers in one step through hot pressing, and the self-hanging type adhesive tape is pre-arranged at a specified position of the composite anti-seepage liner. A PE anti-seepage layer is arranged at the bottom of the PP geotextile protective layer, a PP geotextile protective layer is arranged at the bottom of the PE anti-seepage layer, and the anti-seepage liner has the advantages of being not prone to corrosion and easy to assemble. The device has the advantages of being small in overall occupied size and saving wires.

Description

Technical Field

[0001] This invention relates to the field of seepage-proof liner application technology, and in particular to a self-hanging high-strength acid and alkali resistant seepage-proof liner. Background Technology

[0002] Currently, impermeable liners are widely used in projects such as landfills, sewage treatment plants, artificial lakes, reservoirs, and regulating water storage tanks to prevent liquid leakage. However, existing impermeable liners mostly adopt a single impermeable layer or a simple composite structure, which has the following problems: 1. Limited seepage prevention performance: Leakage is prone to occur when facing complex geological conditions, high water pressure, or chemical erosion. For example, in landfills, leachate contains various harmful substances, and ordinary geotextile linings are difficult to effectively block leakage for a long time, causing pollution to the surrounding soil and groundwater. In the construction of reservoir dam seepage prevention, concrete is often poured directly after the geotextile lining is laid. Concrete itself is highly alkaline, and the strong alkalinity of concrete causes rapid corrosion of polyester geotextile, mainly affecting fiber properties through hydrolysis. In practical applications, the geotextile protective layer of ordinary geotextile linings is corroded by concrete in about 365 days.

[0003] 2. The installation of traditional geomembranes is usually quite cumbersome, requiring a significant amount of manpower and time for laying and securing. Furthermore, their securing methods are often not robust enough, making them prone to displacement and cracking under external forces or ground settlement, thus affecting their seepage prevention effectiveness. For example, in some large-scale projects, uneven site settlement has caused traditional geomembranes to crack, rendering them ineffective in preventing seepage. Summary of the Invention

[0004] (a) Technical problems to be solved The purpose of this invention is to provide a self-hanging, high-strength, acid and alkali resistant seepage-proof liner to solve the defects of existing seepage-proof liners that are easily corroded and damaged, as well as those that are cumbersome to install.

[0005] (II) Technical Solution To solve the above-mentioned technical problems, the present invention provides the following technical solution: a self-hanging high-strength acid and alkali resistant seepage-proof liner, characterized in that: it includes a composite seepage-proof liner formed by hot-pressing a PP geotextile protective layer and a PE seepage-proof layer in one step, and a self-hanging adhesive tape pre-placed at a designated position on the composite seepage-proof liner.

[0006] Preferably, the composite impermeable layer includes a PP geotextile protective layer at the top, a PE impermeable layer at the bottom of the PP geotextile protective layer 1, and a PP geotextile protective layer at the bottom of the PE impermeable layer.

[0007] Preferably, the self-hanging adhesive tape has a barbed hook structure on the side near the PP geotextile protective layer 1.

[0008] Preferably, it includes the following steps: S1: Polyethylene, black masterbatch, antioxidant and UV stabilizer are added into a mixer in proportion, stirred and mixed in a closed container, and then conveyed to the extruder hopper through a screw. S2: A double-layer co-extrusion extruder is used to melt and plasticize the mixed raw materials at a set temperature, extrude them through a die, and filter impurities through a filter screen; S3: The extruded molten material is rolled and combined with geotextile by steel rollers, and then rapidly cooled and shaped by a circulating water cooling system. S4: The calendered and cooled pad is traction-driven, and longitudinal and transverse cutting is performed during the transmission process; S5: Roll the trimmed liner into a roll to obtain the finished self-hanging waterproof liner.

[0009] Preferably, the extruder temperature in S2 is set as follows: Zone 1: 140℃–160℃, Zone 2: 160℃–180℃, Zone 3: 180℃–200℃, and Die head zone: 160℃–220℃.

[0010] Preferably, the screw speed in S2 is 20–50 rpm, and the melt pressure is controlled at 15–25 MPa.

[0011] Preferably, the temperature of the calendering roll in S3 is 120℃–150℃, the temperature of the cooling roll is 20℃–40℃, and the composite pressure is 0.5–1.5 MPa.

[0012] Preferably, the cooling water temperature in S3 is 15℃–25℃, and the water flow velocity is 0.5–1.0 m / s.

[0013] Preferably, the filter screen used in S2 has a mesh size of 100–200.

[0014] (III) Beneficial Effects The present invention provides a self-hanging, high-strength, acid and alkali resistant waterproof liner, the advantages of which are: 1. The PP and PE composite structure combines excellent chemical corrosion resistance and high tensile strength, and can resist acid and alkaline environments (such as alkaline corrosion of concrete) and leachate erosion for a long time.

[0015] 2. By setting up self-hanging adhesive tape with barbs, which are fixedly connected to the PP geotextile protective layer, it can be quickly hung on the slope without additional fixing tools, effectively preventing slippage and improving construction efficiency. Furthermore, the cooperation between the self-hanging adhesive tape and the seepage-proof layer ensures that the seepage-proof liner can be firmly fixed to the installation surface after installation, making it less prone to displacement or cracking, thus improving the stability and service life of the seepage-proof liner.

[0016] 3. This product uses a one-time molding process to avoid secondary processing, enhance product consistency, and extend service life. Attached Figure Description

[0017] Figure 1 This is a flowchart of the production process of the present invention; Figure 2 This is a schematic diagram of the composite seepage-proof liner of the present invention; Figure 3 This is a partially enlarged schematic diagram of the self-hanging adhesive tape in this invention.

[0018] Attached diagram descriptions: 1. PP geotextile protective layer; 2. PE impermeable layer; 3. Barbed hook structure. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

[0020] Please see Figure 1 and Figure 3 A self-hanging high-strength acid and alkali resistant seepage-proof liner, characterized in that: it includes a composite seepage-proof liner formed by hot-pressing a PP geotextile protective layer 1 and a PE seepage-proof layer 2 in one step, and a self-hanging adhesive tape pre-placed at a designated position on the composite seepage-proof liner.

[0021] Furthermore, the composite seepage barrier layer includes a PP geotextile protective layer 1 at the top, a PE seepage barrier layer 2 at the bottom of the PP geotextile protective layer 1, and a PP geotextile protective layer 1 at the bottom of the PE seepage barrier layer 2. Both the PP geotextile protective layer 1 and the PE seepage barrier layer 2 have excellent chemical corrosion resistance, effectively resisting the erosion of leachate, concrete and other harmful substances. They also have high tensile strength and good flexibility, adapting to different geological conditions and foundation deformations. The composite seepage barrier layer formed by the combination of the two greatly improves the seepage prevention capacity and durability of the seepage barrier liner.

[0022] Furthermore, the self-adhesive tape has a barbed hook structure 3 on the side near the PP geotextile protective layer 1. The barbed hook structure 3 increases the contact area and friction between the geomembrane and the installation surface, allowing it to be firmly attached to the installation surface. During installation, simply align the self-adhesive geomembrane with the installation position and press to complete the fixation. No additional fixing tools or complicated installation procedures are required, and the product position can be adjusted at any time according to the site conditions.

[0023] A manufacturing process for a self-hanging, high-strength, acid and alkali resistant waterproof liner includes the following steps: S1: Polyethylene, black masterbatch, antioxidant and UV stabilizer are added into a mixer in proportion, stirred and mixed in a closed container, and then conveyed to the extruder hopper through a screw. S2: A double-layer co-extrusion extruder is used to melt and plasticize the mixed raw materials at a set temperature, extrude them through a die, and filter impurities through a screen. The double-layer co-extrusion extruder unit includes two 160 screw extruders, which are heated by electric heating. Furthermore, the extruder temperature in S2 is set as follows: Zone 1: 140℃–160℃, Zone 2: 160℃–180℃, Zone 3: 180℃–200℃, and Die Zone: 160℃–220℃.

[0024] S3: The extruded molten material is calendered and compounded with geotextile through steel roller calendering, and simultaneously cooled and shaped by a circulating water cooling system. The molten and plasticized material extruded by the extruder and the PP geotextile protective layer are compounded and formed by a calendering unit with a sizing mirror steel roller and a rubber roller. The sizing mirror steel roller and the rubber roller contain circulating water, and the product can be cooled by water cooling while being shaped and compounded. The cooling water is recycled and there is no wastewater discharge. S4: The calendered and cooled pad is traction-driven, and longitudinal and transverse cutting is performed during the transmission process to ensure that the product meets the dimensional requirements. S5: Roll the trimmed liner into a roll to obtain the finished self-hanging waterproof liner.

[0025] Furthermore, in S2, the screw speed is 20–50 rpm, and the melt pressure is controlled at 15–25 MPa.

[0026] Furthermore, in S3, the temperature of the calendering roll is 120℃–150℃, the temperature of the cooling roll is 20℃–40℃, and the composite pressure is 0.5–1.5 MPa.

[0027] Furthermore, the cooling water temperature in S3 is 15℃–25℃, and the water flow velocity is 0.5–1.0 m / s.

[0028] Furthermore, the filter used in S2 has a mesh size of 100–200.

[0029] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0030] 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-hanging, high-strength, acid and alkali resistant, leak-proof liner, characterized in that: This includes a composite geotextile protective layer made of PP geotextile and PE geotextile through hot-pressing and molding in one step, and a self-adhesive tape pre-placed at a designated position on the composite geotextile.

2. The self-hanging high-strength acid and alkali resistant seepage-proof liner according to claim 1, characterized in that: The composite seepage-proof liner includes a PP geotextile protective layer at the top, a PE seepage-proof layer at the bottom of the PP geotextile protective layer, and a PP geotextile protective layer at the bottom of the PE seepage-proof layer.

3. The self-hanging high-strength acid and alkali resistant seepage-proof liner according to claim 1, characterized in that: The self-hanging adhesive tape has a barbed hook structure on the side near the PP geotextile protective layer 1.

4. A manufacturing process for a self-hanging, high-strength, acid and alkali resistant waterproof liner, characterized in that: Includes the following steps: S1: Polyethylene, black masterbatch, antioxidant and UV stabilizer are added into a mixer in proportion, stirred and mixed in a closed container, and then conveyed to the extruder hopper through a screw. S2: A double-layer co-extrusion extruder is used to melt and plasticize the mixed raw materials at a set temperature, extrude them through a die, and filter impurities through a filter screen; S3: The extruded molten material is rolled and combined with geotextile by steel rollers, and then rapidly cooled and shaped by a circulating water cooling system. S4: The calendered and cooled pad is traction-driven, and longitudinal and transverse cutting is performed during the transmission process; S5: Roll the trimmed gasket into a roll to obtain the finished self-hanging waterproof gasket.

5. The production process of a self-hanging high-strength acid and alkali resistant seepage-proof liner according to claim 4, characterized in that: The extruder temperature settings in S2 are as follows: Zone 1: 140℃–160℃, Zone 2: 160℃–180℃, Zone 3: 180℃–200℃, and Die Zone: 160℃–220℃.

6. The production process of a self-hanging high-strength acid and alkali resistant seepage-proof liner according to claim 3, characterized in that: In S2, the screw speed is 20–50 rpm, and the melt pressure is controlled at 15–25 MPa.

7. The production process of a self-hanging high-strength acid and alkali resistant seepage-proof liner according to claim 1, characterized in that: The S3 calender roll temperature is 120℃–150℃, the cooling roll temperature is 20℃–40℃, and the composite pressure is 0.5–1.5 MPa.

8. The production process of a self-hanging high-strength acid and alkali resistant seepage-proof liner according to claim 7, characterized in that: The cooling water temperature in S3 is 15℃–25℃, and the water flow velocity is 0.5–1.0 m / s.

9. A winding device according to claim 8, characterized in that: The filter mesh size used in S2 is 100–200 mesh.

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