An anti-static composite geomembrane and its preparation method

Abstract

The present invention relates to the technical field of geomembranes, and discloses an anti-static composite geomembrane and a preparation method thereof. The anti-static composite geomembrane comprises the following raw materials: high-density polyethylene, linear low-density polyethylene, maleic anhydride grafted high-density polyethylene, ultraviolet absorber, antioxidant, plasticizer, lubricant, anti-static composite rubber, and anti-corrosion reinforcing filler. By participating the anti-static composite rubber and the anti-corrosion reinforcing filler in the preparation process of the geomembrane, the prepared geomembrane has excellent anti-static ability, anti-corrosion ability, impact resistance, high mechanical strength, good wear resistance, and also has high-temperature resistance and the ability to repair micro-cracks, can meet the use requirements under various environments, and has a long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of geomembranes, and particularly to an anti-static composite geomembrane and a preparation method thereof. Background Art

[0002] With the rapid development of modern engineering technology, geomembranes, as indispensable geosynthetic materials, have become increasingly prominent in aspects such as constructing the anti-seepage system of water conservancy projects, strengthening isolation in transportation infrastructure, safely treating landfills in the environmental protection industry, and promoting efficient agricultural irrigation, providing solid technical support for the development and progress of these fields. However, in the face of an increasingly complex and changeable engineering environment and continuously improving performance requirements, ordinary geomembranes have gradually exposed their limitations. Although the mechanical properties of ordinary geomembranes can meet basic requirements, they are inadequate under extreme working conditions. The lack of wear resistance and corrosion resistance leads to a significant reduction in the isolation and anti-seepage effect after long-term service. Especially in places with extremely high requirements for static electricity control, such as electronic precision manufacturing and chemical storage, ordinary geomembranes lack anti-static characteristics, not only easily adsorb dust and affect the working environment, but also may cause fire or electric shock accidents due to static electricity accumulation, constituting a safety hazard. At the same time, under extreme environmental conditions such as high temperature and strong corrosion, the durability of ordinary geomembranes significantly decreases, cracks are easily generated, and it is difficult to repair, unable to meet the needs of diversified application scenarios, thus severely restricting the application fields of geomembranes.

[0003] The patent with the publication number CN108384136B discloses a graphene geomembrane and its preparation method and application. The raw materials of this graphene geomembrane include petroleum resin and graphene, which have excellent mechanical properties and anti-seepage ability, and do not generate static electricity, enabling it to have a wide range of applications in landfills of garbage, hazardous chemical wastes, radioactive wastes, and oil and gas explosion-proof places such as oil and gas fields and chemical industrial zones. However, the graphene geomembrane prepared by this patent uses graphene as the raw material, with a relatively high cost, which limits its use in projects with higher economic requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide an anti-static composite geomembrane and a preparation method thereof, which solve the following technical problems: (1) The mechanical properties of ordinary geomembranes need to be improved, the corrosion resistance and wear resistance are insufficient, and it is difficult to repair after cracks occur, resulting in a short service life; (2) Ordinary geomembranes have poor anti-static ability and are not resistant to high temperature, making it difficult to meet the use requirements in various environments.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An antistatic composite geomembrane, comprising the following raw materials in parts by weight: 22-25 parts of high-density polyethylene, 16-20 parts of linear low-density polyethylene, 8-12 parts of maleic anhydride grafted high-density polyethylene, 1-3 parts of ultraviolet absorber, 1.5-2.5 parts of antioxidant, 2-3 parts of plasticizer, 3-5 parts of lubricant, 8-10 parts of antistatic composite rubber, 6-8 parts of corrosion-resistant reinforcing filler.

[0007] Furthermore, the ultraviolet absorber is any one of ultraviolet absorber UV-1164, ultraviolet absorber UV-1577, and ultraviolet absorber UV-3030; the antioxidant is any one of antioxidant 1010, antioxidant 1076, and antioxidant 168; the plasticizer is any one of diisononyl phthalate, triethyl citrate, and epoxidized soybean oil; the lubricant is any one of polyethylene wax, paraffin wax, and white oil.

[0008] Furthermore, the preparation method of the antistatic composite rubber comprises the following steps:

[0009] S1: Place ethylene propylene diene monomer rubber in toluene, fully mix and stir, add allyl glycidyl ether and initiator, heat up to 65-70 °C and react for 5-6 h. After removing the solvent by vacuum distillation, collect the product to obtain epoxidized ethylene propylene diene monomer rubber;

[0010] S2: Place the epoxidized ethylene propylene diene monomer rubber and 2,2'-dithiopyridine in N,N-dimethylformamide, heat up to react, and collect the product after vacuum distillation to obtain the antistatic composite rubber.

[0011] Furthermore, the initiator is any one of benzoyl peroxide and diisopropylbenzene peroxide.

[0012] In this solution, under the action of an initiator, the double bonds in the ethylene-propylene-diene monomer (EPDM) rubber structure and the double bonds in the allyl glycidyl ether structure undergo a free radical polymerization reaction to obtain epoxidized EPDM rubber. Through the quaternization reaction of the epoxy groups in the epoxidized EPDM rubber structure with the tertiary amine in the 2,2'-dithiopyridine structure, an antistatic composite rubber containing quaternary ammonium groups in its structure is obtained. When this antistatic composite rubber is involved in the preparation process of the geomembrane, the EPDM rubber selected as the matrix has good elasticity itself, which can effectively enhance the flexibility of the geomembrane and improve the impact resistance. The quaternary ammonium groups in its structure enable the geomembrane to have excellent antistatic ability, effectively preventing safety hazards such as electric shock, sparks, and even explosions caused by static electricity accumulation, so that it can be used in electrostatically sensitive environments such as electronic factories, oil and gas projects, and chemical factories, effectively expanding the application fields of the geomembrane. At the same time, there are also multiple hydroxyl groups in its structure, and the multiple hydroxyl groups can interact with the matrix material of the geomembrane, effectively enhancing the compatibility between the antistatic composite rubber and the matrix material, making the combination of the two more compact. The disulfide bonds in its structure have the ability to break and recombine. When the geomembrane is actually used, it can effectively repair the microcracks generated in the geomembrane, thereby preventing the cracks from expanding, effectively avoiding the generation probability of large cracks, and greatly extending the service life of the geomembrane.

[0013] Further, in step S2, the temperature of the temperature-raising reaction is 70 - 80 °C, and the time is 6 - 8 h.

[0014] Further, the preparation method of the corrosion-resistant reinforcing filler includes the following steps:

[0015] SS1: Place rectorite in deionized water, introduce nitrogen, ultrasonically disperse for 10 - 15 min, then add chloroethyl isocyanate and a catalyst, raise the temperature to 75 - 80 °C and react for 3 - 5 h, filter, wash, and dry to obtain chloroethyl rectorite;

[0016] SS2: Place chloroethyl rectorite in chloroform, ultrasonically disperse for 15 - 20 min, then introduce nitrogen, add polyether ether ketone and anhydrous stannic chloride, raise the temperature to reflux and react for 8 - 10 h, after completion, filter, wash, and dry to obtain the corrosion-resistant reinforcing filler.

[0017] In this solution, under the action of a catalyst, the isocyanate group in the structure of chloroethyl isocyanate interacts with the hydroxyl groups on the surface of rectorite to obtain chloroethyl rectorite. Then, under the catalytic action of anhydrous stannic chloride, polyether ether ketone reacts with the active chlorine in the structure of chloroethyl rectorite to obtain an anti-corrosion reinforcing filler. This anti-corrosion reinforcing filler has good dispersibility in the geomembrane matrix material, can effectively enhance the abrasion resistance and tensile strength of the geomembrane, connect polyether ether ketone and rectorite in a chemical bonding manner, combine the barrier ability of the lamellar rectorite with the anti-corrosion ability of polyether ether ketone, can effectively improve the anti-corrosion ability of the geomembrane, and can stably play a barrier role even in the presence of corrosive media. At the same time, the polyether ether ketone coated on its surface also has excellent abrasion resistance and high-temperature resistance, can further improve the abrasion resistance of the geomembrane, improve the high-temperature resistance performance of the geomembrane, expand its application fields, and extend its service life.

[0018] Further, in step SS1, the catalyst is any one of dibutyltin dilaurate and stannous octoate.

[0019] Further, in step SS2, the molecular weight of the polyether ether ketone is 30,000 - 50,000.

[0020] A preparation method of an anti-static composite geomembrane includes the following steps:

[0021] Step 1: Put high-density polyethylene, linear low-density polyethylene, maleic anhydride-grafted high-density polyethylene, ultraviolet absorber, antioxidant, plasticizer, lubricant, anti-static composite rubber, and anti-corrosion reinforcing filler into a mixer, heat up to 185 - 195 °C and mix for 1 - 1.5 h to obtain a mixture.

[0022] Step 2: Put the mixture into a single-screw extruder, melt and extrude it, then blow it into a film, cool it, trim the edges and wind it up to obtain a geomembrane.

[0023] Further, in step 2, the temperature of the front section of the single-screw extruder is 200 - 210 °C, the temperature of the rear section is 210 - 220 °C, and the temperature of the die head is 220 - 230 °C.

[0024] The beneficial effects of the present invention:

[0025] By preparing the anti-static composite rubber and the anti-corrosion reinforcing filler and participating in the preparation process of the geomembrane, the prepared geomembrane has excellent anti-static ability, anti-corrosion ability, impact resistance, high mechanical strength, good abrasion resistance, and also has high-temperature resistance and the ability to repair micro-cracks, can meet the use requirements in various environments, and has a long service life.

[0026] Of course, it is not necessary for any product implementing the present invention to achieve all of the above-described advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a thermogravimetric curve graph of rectorite, chloroethyl rectorite and anti-corrosion filler of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0030] The preparation methods of the antistatic composite rubber and the anti-corrosion reinforcing filler described in the following embodiments and comparative examples of the present invention are as follows:

[0031] I. Preparation of Antistatic Composite Rubber

[0032] S1: Place 4 g of ethylene propylene diene monomer rubber in 80 ml of toluene, mix and stir well, add 3.5 g of allyl glycidyl ether and 0.8 g of benzoyl peroxide, raise the temperature to 65 °C and react for 5 h. After removing the solvent by vacuum distillation, collect the product to obtain epoxidized ethylene propylene diene monomer rubber.

[0033] S2: Place 4.2 g of epoxidized ethylene propylene diene monomer rubber and 3.6 g of 2,2'-dithiopyridine in 100 ml of N,N-dimethylformamide, raise the temperature to 70 °C and react for 6 h. After vacuum distillation, collect the product to obtain the antistatic composite rubber.

[0034] The content of quaternary ammonium groups in the antistatic composite rubber was determined by argentometry. Weigh 1 g of the antistatic composite rubber as a sample and place it in a 100 ml volumetric flask. Dilute it to the mark with a solvent, shake well, transfer 10 ml to a 150 ml conical flask, add 1 ml of potassium chromate indicator, and titrate with a 0.05 ml / L silver nitrate standard solution until the precipitate in the solution no longer changes. Calculate the content of quaternary ammonium groups in the sample using the following formula: Content of quaternary ammonium groups in the sample (%) = CVM×100% / 0.1m; where: C is the concentration of the silver nitrate standard solution, mol / L; V is the volume of silver nitrate consumed in the titration, ml; m is the mass of the sample, g; M is the molar mass of the sample, g / mol. After calculation, the content of quaternary ammonium groups in the sample is 8.45%, indicating that quaternary ammonium groups exist in the finally produced antistatic composite rubber.

[0035] II. Preparation of Corrosion - resistant Reinforcing Filler

[0036] SS1: Place 3 g of rectorite in 100 ml of deionized water, introduce nitrogen, ultrasonically disperse for 10 min, then add 2.8 g of chloroethyl isocyanate and 0.3 g of dibutyltin dilaurate, heat up to 75 °C and react for 3 h. After suction filtration, washing, and drying, chloroethyl rectorite is obtained.

[0037] SS2: Place 3.2 g of chloroethyl rectorite in 150 ml of chloroform, ultrasonically disperse for 15 min, then introduce nitrogen, add 3.5 g of polyether ether ketone with a molecular weight of 30000 and 0.5 g of anhydrous stannic chloride, heat under reflux for 8 h. After filtration, washing, and drying, the corrosion - resistant reinforcing filler is obtained.

[0038] Thermogravimetric analysis was carried out on rectorite, chloroethyl rectorite, and the corrosion - resistant filler. From Figure 1 it can be seen that the final mass retention rate of rectorite at high temperature is 96.5%, and the lost part is due to the thermal decomposition of crystal water; the final mass retention rate of chloroethyl rectorite is 49.9%, and the lost part is due to the thermal decomposition of chloroethyl isocyanate on its surface; the final mass retention rate of the corrosion - resistant reinforcing filler is 23.8%, and the lost part is due to the thermal decomposition of the organic matter on its surface. Examples

[0039] Preparation Method of Geomembrane

[0040] Step 1: Place 22 parts of high - density polyethylene, 16 parts of linear low - density polyethylene, 8 parts of maleic anhydride - grafted high - density polyethylene, 1 part of ultraviolet absorber UV - 1164, 1.5 parts of antioxidant 1010, 2 parts of diisononyl phthalate, 3 parts of polyethylene wax, 8 parts of antistatic composite rubber, and 6 parts of corrosion - resistant reinforcing filler in a mixer, heat up to 185 °C and mix for 1 h to obtain a mixture.

[0041] Step 2: Place the mixture in a single-screw extruder. Set the temperature of the front section of the extruder to 200°C, the temperature of the rear section to 210°C, and the temperature of the die head to 220°C. After melting and extrusion, blow it into a film, trim the edges after cooling, and wind it up to obtain a geomembrane. Example

[0042] Preparation method of geomembrane

[0043] Step 1: Place 23 parts of high-density polyethylene, 18 parts of linear low-density polyethylene, 10 parts of maleic anhydride-grafted high-density polyethylene, 2 parts of ultraviolet absorber UV-1577, 2 parts of antioxidant 1076, 2.5 parts of triethyl citrate, 4 parts of paraffin wax, 9 parts of antistatic composite rubber, and 7 parts of corrosion-resistant reinforcing filler in a mixer. Heat it up to 190°C and mix for 1.2 h to obtain a mixture.

[0044] Step 2: Place the mixture in a single-screw extruder. Set the temperature of the front section of the extruder to 205°C, the temperature of the rear section to 215°C, and the temperature of the die head to 225°C. After melting and extrusion, blow it into a film, trim the edges after cooling, and wind it up to obtain a geomembrane. Example

[0045] Preparation method of geomembrane

[0046] Step 1: Place 25 parts of high-density polyethylene, 20 parts of linear low-density polyethylene, 12 parts of maleic anhydride-grafted high-density polyethylene, 3 parts of ultraviolet absorber UV-3030, 2.5 parts of antioxidant 168, 3 parts of epoxidized soybean oil, 5 parts of white oil, 10 parts of antistatic composite rubber, and 8 parts of corrosion-resistant reinforcing filler in a mixer. Heat it up to 195°C and mix for 1.5 h to obtain a mixture.

[0047] Step 2: Place the mixture in a single-screw extruder. Set the temperature of the front section of the extruder to 210°C, the temperature of the rear section to 220°C, and the temperature of the die head to 230°C. After melting and extrusion, blow it into a film, trim the edges after cooling, and wind it up to obtain a geomembrane.

[0048] Comparative Example 1

[0049] Preparation method of geomembrane

[0050] Step 1: Place 23 parts of high-density polyethylene, 18 parts of linear low-density polyethylene, 10 parts of maleic anhydride-grafted high-density polyethylene, 2 parts of ultraviolet absorber UV-1577, 2 parts of antioxidant 1076, 2.5 parts of triethyl citrate, 4 parts of paraffin wax, and 9 parts of antistatic composite rubber in a mixer. Heat it up to 190°C and mix for 1.2 h to obtain a mixture.

[0051] Step 2: Place the mixture in a single-screw extruder. Set the temperature of the front section of the extruder at 205°C, the temperature of the rear section at 215°C, and the temperature of the die head at 225°C. After melting and extrusion, blow it into a film, trim the edges after cooling, and wind it up to obtain the geomembrane.

[0052] Comparative Example 2

[0053] Preparation method of geomembrane

[0054] Step 1: Place 23 parts of high-density polyethylene, 18 parts of linear low-density polyethylene, 10 parts of maleic anhydride-grafted high-density polyethylene, 2 parts of ultraviolet absorber UV-1577, 2 parts of antioxidant 1076, 2.5 parts of triethyl citrate, 4 parts of paraffin wax, and 7 parts of anti-corrosion reinforcing filler in a mixer, heat up to 190°C, and mix for 1.2 h to obtain a mixture;

[0055] Step 2: Place the mixture in a single-screw extruder. Set the temperature of the front section of the extruder at 205°C, the temperature of the rear section at 215°C, and the temperature of the die head at 225°C. After melting and extrusion, blow it into a film, trim the edges after cooling, and wind it up to obtain the geomembrane.

[0056] Comparative Example 3

[0057] Preparation method of geomembrane

[0058] Step 1: Place 23 parts of high-density polyethylene, 18 parts of linear low-density polyethylene, 10 parts of maleic anhydride-grafted high-density polyethylene, 2 parts of ultraviolet absorber UV-1577, 2 parts of antioxidant 1076, 2.5 parts of triethyl citrate, and 4 parts of paraffin wax in a mixer, heat up to 190°C, and mix for 1.2 h to obtain a mixture;

[0059] Step 2: Place the mixture in a single-screw extruder. Set the temperature of the front section of the extruder at 205°C, the temperature of the rear section at 215°C, and the temperature of the die head at 225°C. After melting and extrusion, blow it into a film, trim the edges after cooling, and wind it up to obtain the geomembrane.

[0060] Comparative Example 4

[0061] Preparation method of geomembrane

[0062] Step 1: Place 23 parts of high-density polyethylene, 18 parts of linear low-density polyethylene, 10 parts of maleic anhydride-grafted high-density polyethylene, 2 parts of ultraviolet absorber UV-1577, 2 parts of antioxidant 1076, 2.5 parts of triethyl citrate, 4 parts of paraffin wax, 9 parts of ethylene-propylene-diene monomer rubber, and 7 parts of anti-corrosion reinforcing filler in a mixer, heat up to 190°C, and mix for 1.2 h to obtain a mixture;

[0063] Step 2: Place the mixture in a single-screw extruder. Set the temperature of the front section of the extruder at 205°C, the temperature of the rear section at 215°C, and the temperature of the die head at 225°C. After melting and extrusion, blow it into a film, trim the edges after cooling, and wind it up to obtain a geomembrane.

[0064] Comparative Example 5

[0065] Preparation method of geomembrane

[0066] Step 1: Place 23 parts of high-density polyethylene, 18 parts of linear low-density polyethylene, 10 parts of maleic anhydride-grafted high-density polyethylene, 2 parts of ultraviolet absorber UV-1577, 2 parts of antioxidant 1076, 2.5 parts of triethyl citrate, 4 parts of paraffin wax, 9 parts of antistatic composite rubber, and 7 parts of rectorite in a mixer. Heat up to 190°C and mix for 1.2 h to obtain a mixture.

[0067] Step 2: Place the mixture in a single-screw extruder. Set the temperature of the front section of the extruder at 205°C, the temperature of the rear section at 215°C, and the temperature of the die head at 225°C. After melting and extrusion, blow it into a film, trim the edges after cooling, and wind it up to obtain a geomembrane.

[0068] Performance testing

[0069] ① Use a universal sample-making machine to make samples that meet the specifications from the geomembranes prepared in Examples 1 - 3 and Comparative Examples 1 - 5. Refer to the standard GB / T 1043.1 - 2008 to test the impact strength of the samples to judge the flexibility and impact resistance of the samples; refer to the standard GB / T 1633 - 2000 to test the Vicat softening temperature of the samples to judge the high-temperature resistance of the samples; immerse the samples in 1.5 mol / L hydrochloric acid solution and 1.5 mol / L sodium hydroxide solution for 10 h respectively, record the weight loss of the samples, and judge the corrosion resistance of the samples. Calculate the weight loss rate through the following formula: Weight loss rate (%) = (m - m1) / m; where m is the mass of the sample, g; m1 is the mass of the sample after immersion treatment, g; Place the sample on the sample stage of a GSL-46 type steel wool friction resistance testing machine, place a 1000 g load weight on it, and rub the sample back and forth at a speed of 15 mm / s for 100 cycles. After completion, observe the scratch situation on the surface of the sample for wear resistance testing; The specific test results are shown in the following table:

[0070]

[0071] As can be seen from the above table, the geomembranes prepared in Examples 1 - 3 and Comparative Examples 1 - 5 all have excellent impact resistance, high temperature resistance, corrosion resistance, and wear resistance. The sample prepared in Comparative Example 1 does not contain a corrosion - resistant reinforcing additive and is average in terms of corrosion resistance and wear resistance. In the sample prepared in Comparative Example 2, no antistatic composite rubber is added, and its impact resistance is inferior to that of the examples. In the sample prepared in Comparative Example 3, neither antistatic composite rubber nor corrosion - resistant reinforcing additive is added. Therefore, it is inferior to the examples in terms of wear resistance, corrosion resistance, high temperature resistance, and impact resistance. In the sample prepared in Comparative Example 4, no antistatic composite rubber is added, and ethylene - propylene - diene monomer rubber is directly added. In the sample prepared in Comparative Example 5, the impact resistance, high temperature resistance, corrosion resistance, and wear resistance are all inferior to those of the examples because no corrosion - resistant reinforcing filler is added and rectorite is directly added, resulting in the agglomeration of rectorite in the sample.

[0072] ② Make the geomembranes prepared in Examples 1 - 3 and Comparative Examples 1 - 5 into samples that meet the specifications using a universal sample preparation machine, and use a DRK321B - II surface resistivity tester to test the surface resistivity of the samples to judge the antistatic ability of the samples; draw a crack with a length of 3 cm and a width of about 0.5 mm on the surface of the sample, and repair it at 150 °C for 24 h. Refer to the standard GB / T1040.2 - 2022 to test the tensile strength of the repaired sample and the initial tensile strength of the sample. Calculate the repair rate of the sample through the following formula: repair rate = (tensile strength after repair / initial tensile strength) × 100%, and judge the repair ability and mechanical properties of the sample. The specific test results are shown in the following table:

[0073]

[0074] As can be seen from the above table, the samples prepared in Examples 1 - 3 all have good mechanical strength, good antistatic effect, and self - repair ability. The sample prepared in Comparative Example 1 has strong antistatic ability and good repair ability due to the addition of antistatic composite rubber. The antistatic ability and repair ability of the samples prepared in Comparative Examples 2, 3, and 4 are poor because the geomembrane structure does not contain quaternary ammonium groups and disulfide bonds. In the sample prepared in Comparative Example 5, although antistatic composite rubber is added, the direct addition of rectorite causes agglomeration in the matrix, resulting in inferior antistatic ability and self - repair ability compared with the examples.

[0075] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0076] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the specific embodiments described or use similar ways to replace them. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. An antistatic composite geomembrane, characterized in that: The invention comprises the following raw materials in parts by weight: 22-25 parts of high-density polyethylene, 16-20 parts of linear low-density polyethylene, 8-12 parts of maleic anhydride grafted high-density polyethylene, 1-3 parts of ultraviolet absorber, 1.5-2.5 parts of antioxidant, 2-3 parts of plasticizer, 3-5 parts of lubricant, 8-10 parts of antistatic composite rubber, and 6-8 parts of anti-corrosion reinforcing filler; The preparation method of the antistatic composite rubber comprises the following steps: S1: placing EPDM rubber in toluene, mixing and stirring thoroughly, adding allyl glycidyl ether and initiator, heating to 65-70°C for reaction for 5-6h, removing the solvent by vacuum distillation, and collecting the product to obtain epoxidized EPDM rubber; S2: placing epoxidized ethylene propylene diene rubber and 2,2'-disulfide dipyridine in N,N-dimethylformamide, heating the mixture for reaction, and collecting the product after reduced pressure distillation to obtain an antistatic composite rubber; The preparation method of the anti-corrosion reinforcing filler comprises the following steps: SS1: Place rectorite in deionized water, introduce nitrogen, and ultrasonically disperse for 10-15 minutes, then add chloroethyl isocyanate and a catalyst, heat to 75-80°C, react for 3-5 hours, filter, wash, and dry to obtain chloroethyl rectorite; SS2: Place chloroethyl rectorite in chloroform, ultrasonically disperse for 15-20 minutes, introduce nitrogen, add polyetheretherketone and anhydrous tin tetrachloride, heat and reflux for 8-10 hours, filter, wash and dry to obtain the corrosion-resistant reinforcing filler.

2. The antistatic composite geomembrane according to claim 1, characterized in that: The ultraviolet absorber is any one of ultraviolet absorber UV-1164, ultraviolet absorber UV-1577, and ultraviolet absorber UV-3030; the antioxidant is any one of antioxidant 1010, antioxidant 1076, and antioxidant 168; the plasticizer is any one of diisononyl phthalate, triethyl citrate, and epoxy soybean oil; and the lubricant is any one of polyethylene wax, paraffin, and white oil.

3. The antistatic composite geomembrane according to claim 1, characterized in that: In step S1, the initiator is any one of benzoyl peroxide and dicumyl peroxide.

4. The antistatic composite geomembrane according to claim 1, characterized in that: In step S2, the temperature of the temperature-raising reaction is 70-80° C. and the time is 6-8 hours.

5. The antistatic composite geomembrane according to claim 1, characterized in that: In step SS1, the catalyst is any one of dibutyltin dilaurate and stannous octoate.

6. The antistatic composite geomembrane according to claim 1, characterized in that: In step SS2, the molecular weight of the polyetheretherketone is 30000-50000.

7. A method for preparing an antistatic composite geomembrane according to claim 1, characterized in that: The following steps are involved: Step 1: Place high-density polyethylene, linear low-density polyethylene, maleic anhydride grafted high-density polyethylene, ultraviolet absorber, antioxidant, plasticizer, lubricant, antistatic composite rubber, and anti-corrosion reinforcing filler in a mixer, heat to 185-195° C., mix for 1-1.5 hours, and obtain a mixture; Step 2: Place the mixed material in a single screw extruder, blow it into a film after melting and extruding, and cut and roll it up after cooling to obtain a geomembrane.

8. The method for preparing an antistatic composite geomembrane according to claim 7, characterized in that: In step 2, the temperature of the front section of the single screw extruder is 200-210°C, the temperature of the rear section is 210-220°C, and the temperature of the die head is 220-230°C.

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