Antistatic POM plate and rod based on nanometer carbon tube functional filler and preparation method thereof

Abstract

This invention relates to the field of engineering plastics modification technology, specifically to antistatic POM (Polymer Oxide Mat) sheets and rods based on carbon nanotube functional fillers and their preparation method. The sheets and rods comprise a POM resin matrix and a structured conductive filler dispersed therein. The structured conductive filler is a carbon nanotube non-covalently encapsulated in a pyrene-containing polyether elastomer, wherein the elastomer contains pyrene groups stacked π-π with the carbon nanotube surface and polytetrahydrofuran ether segments physically entangled with the POM resin matrix. First, a pyrene-containing polyether elastomer is synthesized via esterification. Then, it is non-covalently assembled with carbon nanotubes in a solvent using ultrasound to obtain the structured conductive filler. Finally, it is melt-blended with POM resin and additives, and extruded using gradient cooling. This invention utilizes non-covalent modification to retain the intrinsic conductivity of carbon nanotubes, dissipates impact energy through the interfacial slip and buffering mechanisms of the elastomer layer, imparts excellent antistatic properties to POM at low addition levels, and improves notched impact strength.

Description

Technical Field

[0001] This invention relates to the field of engineering plastic modification technology, and more specifically, to antistatic POM plates and rods based on carbon nanotube functional fillers and their preparation methods. Background Technology

[0002] Polyoxymethylene (POM) is a thermoplastic crystalline polymer with excellent comprehensive properties. It has outstanding mechanical strength, wear resistance, self-lubrication and fatigue resistance. It is widely used in machinery manufacturing, automotive electronics, precision instruments and other fields. It is often processed into sheets and rods of various specifications to replace metal materials such as copper, zinc and aluminum.

[0003] However, the surface resistivity of pure POM resin is typically as high as 10. 14 ~10 16 With a strength of Ω / sq, POM (Polymer Oxide Material) is a typical electrical insulating material. During friction or high-speed operation, static charge easily accumulates on the surface of POM, making it prone to dust attraction. In electronic and electrical applications, mining equipment, and special applications requiring explosion protection, electrostatic discharge can also cause component breakdown or even fire and explosion hazards. Therefore, imparting stable antistatic properties to POM is crucial for expanding its application areas.

[0004] Currently, antistatic POM composites are commonly prepared industrially by adding conductive fillers (such as carbon black, carbon fiber, and carbon nanotubes). Among these, carbon nanotubes (CNTs) are considered ideal conductive fillers due to their extremely high aspect ratio and excellent intrinsic conductivity. However, existing technologies for antistatic modification of POM using carbon nanotubes generally face irreconcilable technical contradictions: First, carbon nanotubes have a large specific surface area and strong van der Waals forces between them, making them prone to aggregation. This makes it difficult to achieve uniform nanoscale dispersion in a high-melt-viscosity POM matrix. Consequently, it is difficult to form a complete three-dimensional conductive network within the material, resulting in a high percolation threshold and extremely unstable antistatic properties.

[0005] Secondly, polyoxymethylene (POM) is a highly crystalline polymer with poor macromolecular chain flexibility and extremely high notch sensitivity. Untreated carbon nanotubes, as rigid inorganic fillers, have extremely poor compatibility with the POM matrix and weak interfacial bonding. When the material is subjected to external impact, the aggregated carbon nanotubes and interfacial defects are very likely to become stress concentration points, causing a precipitous drop in the notched impact strength of the POM composite material and severely losing the original mechanical advantages of POM.

[0006] To improve the dispersibility of carbon nanotubes in polymer matrices, existing techniques typically employ strong oxidation treatment with mixed acids (such as a mixture of nitric and sulfuric acids) to introduce oxygen-containing functional groups such as carboxyl and hydroxyl groups onto their surface, or further use coupling agents for graft modification. However, this covalent modification method severely disrupts the conjugated graphene lattice structure of the carbon nanotube wall, leading to a significant reduction in its intrinsic conductivity.

[0007] On the other hand, some existing technologies use ternary blending to toughen the material by introducing traditional elastomers (such as TPU) or macromolecular compatibilizers. However, in actual processing, the addition of a large amount of insulating elastomers often results in disordered coating on the surface of conductive fillers, increasing the distance between carbon nanotubes, hindering electron tunneling, and causing a sharp increase in the surface resistivity of the material. At the same time, simple blending of elastomers can also lead to a significant decrease in the overall tensile strength and stiffness of POM.

[0008] Therefore, how to impart excellent antistatic properties to highly crystalline POM resin using carbon nanotubes while avoiding the destruction of the intrinsic conductive structure of carbon nanotubes by covalent modification, and effectively solve the stress concentration problem caused by rigid fillers, so as to achieve synergistic improvement of antistatic properties and matrix toughening at low addition levels, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] The purpose of this invention is to provide antistatic POM plates and rods based on carbon nanotube functional fillers and their preparation methods, in order to solve the problems mentioned in the background art, such as the easy agglomeration of carbon nanotubes, the reduction of intrinsic conductivity due to surface covalent modification, and the significant decrease in notched impact strength of POM resin caused by rigid inorganic fillers.

[0010] To achieve the above objectives, on the one hand, the present invention provides an antistatic POM plate or rod based on carbon nanotube functional filler, comprising a POM resin matrix and a structured conductive filler dispersed in the POM resin matrix. The structured conductive filler is a carbon nanotube non-covalently encapsulated with pyrene-containing polyether elastomer; The pyrene-containing polyether elastomer comprises pyrene groups that form π-π stacking interactions with the surface of carbon nanotubes, and polytetrahydrofuran ether segments that form physical entanglement with the POM resin matrix.

[0011] Preferably, the pyrene-containing polyether elastomer is a pyrene-terminated modified polymer obtained by esterification of 1-pyrene butyric acid and polytetrahydrofuran ether diol.

[0012] Preferably, the number-average molecular weight Mn of the polytetrahydrofuran ether diol is 1000-2000.

[0013] Preferably, the raw materials for preparing the antistatic POM board / rod, by mass percentage, include: 95%–98.5% POM resin, 0.5%–3% structured conductive filler, 0.2%–1% formaldehyde absorbent, and 0.1%–0.5% antioxidant.

[0014] Preferably, the carbon nanotubes are multi-walled carbon nanotubes without surface covalent modification treatment and have an aspect ratio greater than 200.

[0015] Preferably, the formaldehyde absorbent is melamine or dicyandiamide.

[0016] On the other hand, the present invention provides a method for preparing antistatic POM plates and rods based on the above-mentioned functional fillers of carbon nanotubes, comprising the following steps: S1. 1-Pyrenebutyric acid and polytetrahydrofuran ether diol were subjected to esterification reaction under the action of a catalyst. After the reaction was completed, the mixture was purified to obtain a pyrene-containing polyether elastomer. S2. Carbon nanotubes and the pyrene-containing polyether elastomer are added to an organic solvent, ultrasonically dispersed, the solvent is removed and dried to obtain a structured conductive filler. S3. The structured conductive filler, POM resin matrix and auxiliary additives are mixed evenly, melt-blended and granulated by a twin-screw extruder, and then extruded to obtain antistatic POM sheets and rods.

[0017] Preferably, in step S1, the catalyst is a mixture of N,N'-dicyclohexylcarbodiimide and 4-dimethylaminopyridine, the reaction temperature is 25-40°C, and the reaction time is 24-48 h.

[0018] Preferably, in step S2, the ultrasonic dispersion temperature is 20-30°C, the ultrasonic power is 400-600W, and the ultrasonic time is 1-3h; the mass ratio of the carbon nanotubes to the pyrene-containing polyether elastomer is 1:(1-3).

[0019] Preferably, in step S3, the processing temperature of the twin-screw extruder is controlled between 175 and 210°C, and the cooling water temperature during the extrusion molding process is set in a gradient of 80–90°C, 60–70°C, and 20–30°C.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: In this antistatic POM sheet / rod based on carbon nanotube functional filler and its preparation method, carbon nanotubes are non-covalently encapsulated with a pyrene-containing polyether elastomer. The pyrene groups interact with the graphene lattice on the carbon nanotube surface through π-π stacking. This non-covalent modification preserves the intrinsic structure and electrical conductivity of the carbon nanotubes. Simultaneously, the steric hindrance provided by the polytetrahydrofuran ether (PTMEG) segments inhibits the aggregation of carbon nanotubes. During melt blending, the PTMEG segments physically entangle with the POM macromolecular chains, resulting in uniform dispersion of the filler within the POM matrix and reducing the percolation threshold. When the filler content is 0.5%–3%, the surface resistivity of the POM sheet / rod can reach 10⁻⁶. 6 ~10 8 Ω / sq.

[0021] Secondly, the PTMEG coating on the surface of carbon nanotubes can generate an interfacial buffering effect when subjected to stress. When POM plates and rods are subjected to external impact loads, the flexible PTMEG layer at the interface can induce crazing and shear yielding in the matrix, thereby absorbing impact energy and improving the stress concentration problem caused by the direct contact of rigid fillers with the POM matrix.

[0022] Because the pyrene group and carbon nanotubes are non-covalently bonded, the pyrene-containing polyether elastomer can undergo restricted slippage on the carbon nanotube surface when the material is subjected to external destructive stress. This interfacial frictional slippage process dissipates mechanical energy, avoiding the decrease in mechanical properties caused by interfacial brittle fracture in conventional direct blends, and improving the material's antistatic properties and notched impact strength.

[0023] In addition, the number average molecular weight of polytetrahydrofuran ether diol is limited to 1000-2000, which balances the coating thickness on the filler surface and avoids the electron tunneling effect being hindered by an excessively thick insulation layer. Combined with the gradient cooling process in extrusion molding, it controls the crystallization rate of POM in thick-walled plates and rods and reduces internal thermal stress. Attached Figure Description

[0024] Figure 1 This is an overall flowchart of Embodiment 1 of the present invention. Detailed Implementation

[0025] The technical solutions in 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, and 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.

[0026] The sources of the raw materials and reagents used in the embodiments and comparative examples of this invention are as follows: Polyoxymethylene (POM) resin: Commercially available copolymer polyoxymethylene with a melt flow rate (MFR) of 9.0 g / 10 min (190 °C, 2.16 kg).

[0027] Multi-walled carbon nanotubes (MWCNTs): Commercially available, outer diameter 10-20 nm, length 10-30 μm, aspect ratio >200, purity >95 wt%, without surface chemical modification treatment.

[0028] 1-Pyrenebutyric acid, polytetrahydrofuran ether diol (PTMEG, number average molecular weights of 600, 1000, 1400, 2000, and 3000, respectively), N,N'-dicyclohexylcarbodiimide (DCC), 4-dimethylaminopyridine (DMAP), melamine, and antioxidant 1010: all were commercially available analytical grade or industrial grade reagents.

[0029] Preparation Example 1: Synthesis of Pyrene-PTMEG-containing polyether elastomer.

[0030] (1) Weigh 1-pyrene butyric acid and polytetrahydrofuran ether diol (PTMEG-1400) with a number average molecular weight of 1400 according to the material ratio, so that the molar ratio of 1-pyrene butyric acid to PTMEG-1400 is 2.1:1; (2) Dissolve the above raw materials in anhydrous dichloromethane, add catalysts DCC and DMAP, the molar ratio of DCC to 1-pyrenebutyric acid is 1.2:1, and the molar ratio of DMAP to 1-pyrenebutyric acid is 0.1:1; (3) Stir the reaction at 30°C for 36 h. After the reaction is complete, filter to remove insoluble matter, concentrate the filtrate by evaporation, add excess cold methanol to precipitate, wash repeatedly and dry in a vacuum drying oven at 40°C to constant weight to obtain end-functionalized pyrene-containing polyether elastomer (denoted as Pyrene-PTMEG-1400).

[0031] Using the same method, PTMEG-1400 was replaced with polytetrahydrofuran ether diol with a number average molecular weight of 600, 2000, and 3000, respectively, to prepare the corresponding pyrene-containing polyether elastomers, which were designated as Pyrene-PTMEG-600, Pyrene-PTMEG-2000, and Pyrene-PTMEG-3000, respectively.

[0032] Preparation Example 2: Preparation of Structured Conductive Filler.

[0033] (1) Weigh 10g of untreated multi-walled carbon nanotubes and 20g of Pyrene-PTMEG-1400 prepared in Preparation Example 1 (mass ratio 1:2), and add them together to 500mL of tetrahydrofuran solvent; (2) The Pyrene-PTMEG-1400 was ultrasonically dispersed for 2 hours at 25℃ and 500W to allow non-covalent assembly between the Pyrene-PTMEG-1400 and the carbon nanotube surface. (3) After the ultrasound was completed, most of the tetrahydrofuran solvent was removed by vacuum distillation. The solid product was then dried in a vacuum drying oven at 60°C for 24 hours and pulverized to obtain the structured conductive filler (referred to as filler A).

[0034] Using the same method, Pyrene-PTMEG-600, Pyrene-PTMEG-2000, and Pyrene-PTMEG-3000 were assembled with carbon nanotubes to prepare structured conductive fillers, which were denoted as filler B, filler C, and filler D, respectively.

[0035] Example 1: The antistatic POM plate / rod based on carbon nanotube functional filler in this example comprises the following raw material formulation by mass percentage: The composition includes 98.2% POM resin, 1.5% filler A, 0.2% melamine, and 0.1% antioxidant 1010. The preparation method comprises the following steps: (1) Weigh each raw material according to the formula ratio, place them in a high-speed mixer and premix for 5 minutes to obtain a heterogeneous mixture; (2) The mixture is fed into a twin-screw extruder. The processing temperature of each zone of the twin-screw extruder is controlled as follows: Zone 1 175℃, Zone 2 185℃, Zone 3 195℃, Zone 4 200℃, Zone 5 205℃, and the die head 200℃; the screw speed is 200 rpm. After melt blending extrusion, water cooling, and pelletizing, composite plastic particles are obtained. (3) The composite plastic particles are fed into a single-screw sheet extruder and melt-extruded at 190-205℃. The die outlet is connected to a three-roll calender, and the cooling water temperature of the three rolls is set in a gradient along the material's forward direction: the first roll has a water temperature of 85℃, the second roll has a water temperature of 65℃, and the third roll has a water temperature of 25℃. After the material is cooled and solidified by the gradient, it is cut and shaped into an antistatic POM sheet with a thickness of 20mm.

[0036] Example 2: The antistatic POM plate / rod based on carbon nanotube functional filler in this example comprises the following raw material formulation by mass percentage: The composition is: POM resin 99.2%, filler A 0.5%, melamine 0.2%, antioxidant 1010 0.1%. The preparation process is the same as in Example 1, except that: In step (3), the rod is extruded through a die, and the cooling water temperature of the shaping sleeve is controlled in a gradient: 80℃ in zone 1, 60℃ in zone 2, and 20℃ in zone 3, finally obtaining an antistatic POM rod with a diameter of 50mm.

[0037] Example 3: The antistatic POM plate / rod based on carbon nanotube functional filler in this example comprises the following raw material formulation by mass percentage: The composition of the product is as follows: 96.2% POM resin, 3.0% filler A, 0.5% melamine, and 0.3% antioxidant 1010. The preparation process is the same as in Example 1.

[0038] Example 4: The antistatic POM plate / rod based on carbon nanotube functional filler in this example has the same raw material formulation and preparation process as in Example 1, with the only difference being: Replace packing A with an equal mass of packing C (prepared using PTMEG with a number average molecular weight of 2000).

[0039] Comparative Example 1: A POM board of this comparative example, the raw material formula of which includes, by mass percentage: The composition consists of 98.2% POM resin, 1.5% untreated multi-walled carbon nanotubes, 0.2% melamine, and 0.1% antioxidant 1010. The preparation method is the same as in Example 1, except that the unmodified carbon nanotubes are directly mixed with POM and other additives and extruded.

[0040] Comparative Example 2: A POM board of this comparative example, the raw material formula of which includes, by mass percentage: The composition includes 98.2% POM resin, 1.5% mixed acid modified carbon nanotubes, 0.2% melamine, and 0.1% antioxidant 1010. The preparation method of the mixed acid modified carbon nanotubes is as follows: Multi-walled carbon nanotubes were placed in a mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio 3:1), ultrasonically treated at 60°C for 4 hours, washed until neutral, and then dried. The preparation method was the same as in Example 1.

[0041] Comparative Example 3: A POM board of this comparative example, the raw material formula of which includes, by mass percentage: The composition includes 97.7% POM resin, 1.0% untreated multi-walled carbon nanotubes, 1.0% PTMEG-1400 resin, 0.2% melamine, and 0.1% antioxidant 1010. The preparation method is as follows: Unmodified carbon nanotubes, PTMEG-1400 and POM resin were directly mixed and ternary blended using a twin-screw extruder. The subsequent sheet molding process was the same as in Example 1.

[0042] Comparative Example 4: A POM board of this comparative example has the same raw material formula and preparation process as Example 1, except that filler A is replaced with filler B of equal mass (prepared using PTMEG with a number average molecular weight of 600).

[0043] Comparative Example 5: A POM board of this comparative example has the same raw material formula and preparation process as Example 1, except that filler A is replaced with filler D of equal mass (prepared using PTMEG with a number average molecular weight of 3000).

[0044] Comparative Example 6: A POM sheet material of this comparative example, with the same raw material formula as Example 1. The preparation process of this material is the same as that of Example 1 in steps (1) and (2), except that in step (3), the cooling water of the three-roll calender at the outlet of the extrusion die is not set with a gradient, and the water temperature of the three rolls is uniformly controlled at 20°C.

[0045] Experimental Example: Performance Testing. Samples of the POM sheets and rods prepared in Examples 1-4 and Comparative Examples 1-6 were taken and processed into standard test specimens. The test items and standards are as follows: Surface resistivity: Tested according to GB / T 1410-2006 standard, with an applied voltage of 100V.

[0046] Notched impact strength: The notched impact performance of simply supported beams was tested according to GB / T 1043.1-2008 standard, and the notch type of the specimen was type A.

[0047] Tensile strength: Tested according to GB / T 1040.2-2006 standard, with a tensile speed of 50 mm / min.

[0048] Internal thermal stress defect assessment: By slicing the center of a 20mm thick sheet, observe whether there are macro or micro cracks or holes to assess the product uniformity.

[0049] The test results for the basic reference sample of pure polyoxymethylene (POM) resin are as follows: surface resistivity 1.5 × 10⁻⁶. 15 Ω / sq, notched impact strength 6.2kJ / m 2 The tensile strength was 65 MPa. The test data for each embodiment and comparative example are shown in Table 1.

[0050] Table 1: Performance test results of each embodiment and comparative example As shown in Table 1, comparing pure POM resin, Example 1, and Comparative Examples 1-2, it is evident that the conventional direct addition of untreated carbon nanotubes (Comparative Example 1) easily leads to agglomeration in the POM matrix and causes severe stress concentration, resulting in a notched impact strength decreasing from 6.2 kJ / m. 2 It plummeted to 3.1 kJ / m 2 While traditional mixed acid covalent modification (Comparative Example 2) slightly improved dispersibility, the surface resistivity of the carbon nanotubes could only be maintained at 10 Ω·cm due to the disruption of the conjugated conductive network on the surface. 9The value is on the order of Ω / sq, and the impact strength is 4.5 kJ / m. 2 It is still lower than that of pure resin, and cannot achieve a true performance balance.

[0051] Example 1 uses carbon nanotubes non-covalently encapsulated with pyrene-containing polyether elastomer. With a low loading of only 1.5%, the surface resistivity consistently reached 10⁻⁶. 7 It exhibits excellent antistatic properties at the Ω / sq level, while its notched impact strength is significantly improved compared to pure POM matrix (reaching 8.4 kJ / m). 2 This objectively proves that the structured filler, without compromising its intrinsic conductivity, successfully dissipated impact energy through the microscopic slip mechanism of the interfacial elastic layer.

[0052] Secondly, comparing Example 1 and Comparative Example 3, it can be seen that in the simple ternary blend system of Comparative Example 3, the free PTMEG resin is randomly coated on the surface of carbon nanotubes or dispersed in the POM matrix. This disordered coating severely blocks the electron tunneling effect between carbon nanotubes, resulting in the material being essentially insulated (resistivity as high as 10 Ω·cm). 12 The Ω / sq value decreased, and the mechanical properties deteriorated across the board. This further confirms the necessity of this invention for preliminary π-π anchoring using pyrene-based materials to construct structured fillers.

[0053] Meanwhile, the limitation of the number-average molecular weight of PTMEG (Mn=1000~2000) in this invention, combined with the data from Examples 1, 4 and Comparative Examples 4-5, shows that when the molecular weight of PTMEG is too low (Comparative Example 4, Mn=600), the thickness of the interfacial flexible buffer layer is insufficient, which cannot effectively induce crazing and shear yielding in the matrix, and the impact strength is only 5.2 kJ / m. 2 Toughening cannot be achieved; when the molecular weight of PTMEG is too high (Comparative Example 5, Mn=3000), the excessively long polymer chains lead to excessive steric hindrance, hindering charge transfer between carbon nanotube networks, causing the surface resistivity to rebound sharply to 10. 10 Ω / sq. The test results of the examples accurately define the molecular weight range in which conductivity and toughness are optimal in both aspects.

[0054] Furthermore, comparing Example 1 and Comparative Example 6, it can be seen that when using conventional rapid cooling at a uniform water temperature (Comparative Example 6), the contradiction between the high crystallization rate of POM and the uneven heat transfer due to the thick wall (20mm) results in microscopic shrinkage cavities and cracks in the core of the material, leading to fluctuations in macroscopic impact resistance. The gradient cooling process of 85℃-65℃-25℃ used in Example 1 effectively controlled the crystallization shrinkage rate, eliminated internal thermal stress, and provided process assurance for the performance stability of the final product.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An antistatic POM plate or rod based on carbon nanotube functional filler, characterized in that, It includes a POM resin matrix and a structured conductive filler dispersed in the POM resin matrix; The structured conductive filler is a carbon nanotube non-covalently encapsulated with pyrene-containing polyether elastomer; The pyrene-containing polyether elastomer comprises pyrene groups that form π-π stacking interactions with the surface of carbon nanotubes, and polytetrahydrofuran ether segments that form physical entanglement with the POM resin matrix.

2. The antistatic POM plate / rod based on carbon nanotube functional filler according to claim 1, characterized in that, The pyrene-containing polyether elastomer is a pyrene-terminated modified polymer obtained by esterification of 1-pyrene butyric acid and polytetrahydrofuran ether diol.

3. The antistatic POM plate / rod based on carbon nanotube functional filler according to claim 2, characterized in that, The number-average molecular weight of the polytetrahydrofuran ether diol is 1000–2000.

4. The antistatic POM plate / rod based on carbon nanotube functional filler according to claim 1, characterized in that, The raw materials for preparation, by mass percentage, include: POM resin 95%–98.5%, structured conductive filler 0.5%–3%, formaldehyde absorber 0.2%–1%, antioxidant 0.1%–0.5%.

5. The antistatic POM plate / rod based on carbon nanotube functional filler according to claim 1, characterized in that, The carbon nanotubes are multi-walled carbon nanotubes that have not undergone surface covalent modification and have an aspect ratio greater than 200.

6. The antistatic POM plate / rod based on carbon nanotube functional filler according to claim 4, characterized in that, The formaldehyde absorbent is melamine or dicyandiamide.

7. A method for preparing antistatic POM plates and rods based on carbon nanotube functional fillers as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. 1-Pyrenebutyric acid and polytetrahydrofuran ether diol were subjected to esterification reaction under the action of a catalyst. After the reaction was completed, the mixture was purified to obtain a pyrene-containing polyether elastomer. S2. Carbon nanotubes and the pyrene-containing polyether elastomer are added to an organic solvent, dispersed by ultrasonication, the solvent is removed and dried to obtain a structured conductive filler. S3. The structured conductive filler, POM resin matrix and auxiliary additives are mixed evenly, melt-blended and granulated by a twin-screw extruder, and then extruded to obtain antistatic POM sheets and rods.

8. The method for preparing antistatic POM plates and rods based on carbon nanotube functional fillers according to claim 7, characterized in that, In S1, the catalyst is a mixture of N,N'-dicyclohexylcarbodiimide and 4-dimethylaminopyridine; the reaction temperature is controlled at 25-40°C, and the reaction time is controlled at 24-48h.

9. The method for preparing antistatic POM plates and rods based on carbon nanotube functional fillers according to claim 7, characterized in that, In S2, the ultrasonic dispersion temperature is 20-30℃, the ultrasonic power is 400-600W, and the ultrasonic time is 1-3h; the mass ratio of carbon nanotubes to pyrene-containing polyether elastomer is 1:(1-3).

10. The method for preparing antistatic POM plates and rods based on carbon nanotube functional fillers according to claim 7, characterized in that, In S3, the processing temperature of the twin-screw extruder is controlled between 175 and 210°C; the cooling water temperature during the extrusion molding process is set in a gradient of 80–90°C, 60–70°C, and 20–30°C along the material's forward direction.

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