Antistatic ABS sheet and preparation method thereof

Abstract

The present invention relates to an antistatic ABS sheet and a preparation method thereof, belonging to the technical field of polymer composite materials. The ABS sheet comprises the following raw materials, measured by weight: 100 parts of ABS resin, 5.8-7.2 parts of a modified antistatic agent, 0.25-0.3 parts of an antioxidant, and 0.4-0.5 parts of a lubricant. The modified antistatic agent is formed by ring-opening and ring-closing reactions of triethanolamine and epichlorohydrin to form an epoxy matrix, which is then self-polymerized by N-phenyl-p-phenylenediamine to form an amino-terminated aniline tetramer. The epoxy matrix and the aniline tetramer are then ring-opened to form a modified intermediate, which is finally quaternized with 2-iodoethanol. The modified intermediate forms an "umbrella-shaped" distribution in the ABS matrix, achieving a deep-surface synergistic electrostatic dissipation network and enhancing surface properties.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer composite materials, and in particular relates to an antistatic ABS sheet and a preparation method thereof. Background Art

[0002] ABS resin (acrylonitrile-butadiene-styrene) has become a key material in the sheet metal industry due to its excellent overall performance. It is widely used in applications such as precision electronic component conveyor lines, anti-static turnover boxes, cleanroom partitions, and sensitive device storage cabinets. However, its inherent high insulation properties result in poor anti-static capabilities. Frequent friction between the sheet metal and materials and equipment during transportation or storage causes static charge accumulation. This can easily lead to dust contamination of products, electrostatic discharge that damages sensitive electronic components, and even fire or explosion accidents in flammable and explosive environments.

[0003] In view of the defect of insufficient antistatic properties of ABS materials, the most convenient and efficient antistatic technical means is to introduce antistatic agents into the blend. However, the existing antistatic agents have the following technical bottlenecks: Inorganic antistatic agents, represented by graphene, carbon nanotubes, carbon fibers, etc., can provide permanent and efficient antistatic properties, but require a high addition amount to build an effective conductive network. The high filling amount seriously deteriorates the toughness of ABS, resulting in a sharp increase in the brittleness of the sheet and a significant decrease in impact resistance. It is very easy to crack and fail in dynamic transportation or collision scenarios, which makes the toughness of ABS sheets Their advantages are difficult to realize. Organic antistatic agents, such as quaternary ammonium salts and sulfonates, migrate on the surface of materials to form static channels. While low dosage offers high antistatic efficiency, intense local friction can generate instantaneous static charges that far exceed the dissipation capacity of these channels. Charges quickly accumulate near the surface and cannot be promptly dissipated, creating high-potential points and dramatically increasing the risk of electrostatic discharge. Furthermore, organic antistatic agents continuously precipitate onto the surface, forming a weak interface layer. This not only makes the surface sticky and susceptible to dirt absorption, but also significantly reduces surface hardness, wear resistance, and scratch resistance. For conveyor sheets or packaging linings subject to frequent contact and friction, the service life and appearance of these materials are severely compromised.

[0004] Therefore, the development of an antistatic sheet material that can achieve efficient, rapid, and all-round static dissipation while maintaining the excellent mechanical properties and good surface properties of ABS has become an urgent need in this field. Summary of the Invention

[0005] In order to solve the technical problems mentioned in the background technology, the purpose of the present invention is to provide an antistatic ABS sheet and a preparation method thereof.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An antistatic ABS plate comprises the following raw materials in parts by weight: 100 parts of ABS resin, 5.8-7.2 parts of a modified antistatic agent, 0.25-0.3 parts of an antioxidant, and 0.4-0.5 parts of a lubricant.

[0008] The modified antistatic agent is prepared by the following method:

[0009] Step A1: Triethanolamine, triethylamine, and dioxane were mixed, heated to 45-55°C, and then epichlorohydrin was slowly added with stirring to react for 2-3 hours. Then, sodium hydroxide solution was added and the temperature was continued to rise to 100°C and refluxed for 6-8 hours. After the reaction, the dioxane was removed by rotary evaporation. After the substrate was cooled, it was washed with deionized water and dried to obtain an epoxy matrix;

[0010] In the reaction of step A1, the ratio of triethanolamine, epichlorohydrin, triethylamine, sodium hydroxide, and dioxane is 0.1 mol: 0.31-0.32 mol: 1.5-2 mL: 6.5-8 g: 120-150 mL. Triethanolamine and epichlorohydrin preferentially open the ring under the promotion of triethylamine, and then close the ring under the catalysis of a large amount of strongly alkaline sodium hydroxide. The specific reaction route is as follows:

[0011]

[0012] Step A2: N-phenyl-p-phenylenediamine, manganese dioxide, and acetone were mixed, hydrochloric acid was added to adjust the pH to 1, the temperature of the water bath was controlled at 5-15°C, and ammonium persulfate solution was slowly added and stirred to react for 10-13 hours. After the reaction was completed, ammonia was added to neutralize the mixture, and deionized water was added to wash the mixture. The precipitate was filtered and dried to obtain an aniline tetramer.

[0013] In the reaction of step A2, the ratio of N-phenyl-p-phenylenediamine, manganese dioxide, ammonium persulfate, and acetone is 0.1 mol: 25-30 mg: 2.8-3.5 g: 420-480 mL. Under the catalysis of manganese dioxide and the oxidation of ammonium persulfate, N-phenyl-p-phenylenediamine undergoes autooxidation to form aniline tetramers. The specific reaction route is as follows:

[0014]

[0015] Step A3: premix aniline tetramer, tetrabutylammonium bromide, and dichloromethane, then add the epoxy matrix and mix thoroughly. Heat to 35-40°C and reflux for 5.5-7 hours. After the reaction is complete, remove the dichloromethane by rotary evaporation to obtain a modified intermediate.

[0016] In the reaction of step A3, the amount ratio of the epoxy group, aniline tetramer, tetrabutylammonium bromide and dichloromethane is 10 mmol: 30 mmol: 40-55 mg: 300-350 mL. Under the promotion of tetrabutylammonium bromide, the active terminal amino group of the aniline tetramer and the epoxy group undergo a ring-opening reaction. The specific reaction route is as follows:

[0017]

[0018] Step A4: premixing the modified intermediate, 2-iodoethanol, and dimethylacetamide, adding potassium carbonate, and stirring at 100-120°C for 7-10 hours. After the reaction, remove dimethylacetamide by vacuum rotary evaporation. After cooling, wash the substrate with ethanol and deionized water, and dry it to obtain a modified antistatic agent.

[0019] In the reaction of step A4, the modified intermediate, 2-iodoethanol, potassium carbonate, and dimethylacetamide are used in a ratio of 10 mmol: 25-35 mmol: 0.9-1.4 g: 80-100 mL. 2-iodoethanol and the modified intermediate undergo a quaternization reaction. The specific reaction route is as follows:

[0020]

[0021] Preferably, the lubricant is compounded from ethylene bisstearamide and silicone masterbatch, which maintains stable internal and external lubrication and is suitable for the melt-mixing-calendering integrated plate-making process.

[0022] The invention discloses a preparation method of an antistatic ABS sheet, which specifically comprises the following steps: uniformly mixing raw materials of various components, melting and kneading the mixture by a twin-screw extruder, calendering the melt after extrusion, and cutting the melt after cooling to obtain the ABS sheet.

[0023] Preferably, during the melt mixing process, the barrel temperature of the twin-screw extruder is set to: 180-200°C in the feeding section, 200-220°C in the melting section, and 220-230°C in the homogenizing section.

[0024] Beneficial effects of the present invention:

[0025] The present invention discloses a modified antistatic agent suitable for ABS materials, which constructs a deep-surface synergistic electrostatic dissipation network in the ABS matrix and enhances the surface properties. The specific mechanism is as follows:

[0026] The quaternary ammonium structure in the middle of the modified antistatic agent molecule forms a highly polar cationic center, significantly increasing its incompatibility in the ABS matrix and becoming the core driving force for the molecule's directional migration to the board surface. The polyhydroxy structure surrounding the quaternary ammonium group greatly enhances the molecule's hydrophilicity, which not only strengthens the ionic conductive channels formed on the material surface but also, in conjunction with the quaternary ammonium group, enables the antistatic agent to accumulate more rapidly and in greater quantities on the ABS board surface, forming a highly effective first line of defense against static electricity, quickly removing most of the surface static charge generated by contact friction. The strong hydrogen bonding between the aniline tetramer side chains and the nitrile groups on the ABS macromolecular chains significantly enhances the compatibility of the modified antistatic agent molecule with the ABS matrix. Furthermore, the side chains are firmly "anchored" between the ABS molecular chains through intermolecular forces, extending and interweaving in the matrix to form a three-dimensional electronic conductive network that penetrates the near-surface layer of the material, forming a second line of defense against static electricity.

[0027] The molecular center of the modified antistatic agent migrates to the surface, with its branches extending between the molecular chains of the ABS matrix, forming an "umbrella-like" structure. During intense or localized friction, the instantaneous static charge generated may exceed the immediate conduction capacity of the surface ion channels. In this situation, excess charge not promptly conducted away by the surface layer does not accumulate near the surface, forming a dangerously high potential. Instead, it is rapidly channeled into the near-surface "umbrella-like" network composed of interwoven aniline tetramer chains. This conductive network, deep within the matrix, acts as a distributed charge buffer or temporary reservoir, absorbing and temporarily storing this excess charge. Subsequently, the stored charge can be dissipated over a wider area within the material through the vast electronic network itself, and can also be continuously and smoothly released into the environment through ion channels or network nodes. This static dissipation mechanism significantly reduces the peak intensity of charge accumulation, avoids the instantaneous strong discharge caused by excessive localized charge concentration, and effectively buffers, conducts, and smoothly releases sudden, high-intensity static electricity, significantly improving the material's antistatic stability and safety under dynamic friction.

[0028] In addition, unlike traditional organic antistatic agents that form a weak molecular layer on the surface, the modified antistatic agent of the present invention forms an enhanced cross-linked network structure near the surface of the material through the strong interaction and physical entanglement between the aniline tetramer side chains and the ABS matrix, which significantly enhances the rigidity and mechanical strength of the near-surface layer, enhances the ability to resist external force intrusion, and makes the surface less prone to scratches or wear. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1: Preparation of antistatic ABS sheet. The specific implementation process is as follows:

[0031] (1) Preparation of modified antistatic agent

[0032] Step A1: triethanolamine, triethylamine and dioxane were mixed and heated to 45°C. Epichlorohydrin was slowly added and stirred for 3 hours. Sodium hydroxide was then prepared into a saturated solution at room temperature, added to the reaction system and the temperature was continued to rise to 100°C and refluxed for 8 hours. The amount ratio of triethanolamine, epichlorohydrin, triethylamine, sodium hydroxide and dioxane was 0.1 mol: 0.31 mol: 1.5 mL: 6.5 g: 120 mL. After the reaction was completed, the dioxane was removed by rotary evaporation. After the substrate was cooled, it was washed with deionized water and dried to obtain an epoxy matrix.

[0033] Step A2: N-phenyl-p-phenylenediamine, manganese dioxide, and acetone were mixed, and hydrochloric acid was added to adjust the pH to 1. The temperature of the water bath was controlled at 5°C. Ammonium persulfate was prepared into a 5 wt% aqueous solution at room temperature. The ammonium persulfate solution was slowly added and stirred for 13 hours. The hydrochloric acid used was 35% industrial concentrated hydrochloric acid. The amount ratio of N-phenyl-p-phenylenediamine, manganese dioxide, ammonium persulfate, and acetone was 0.1 mol: 25 mg: 2.8 g: 420 mL. After the reaction was completed, ammonia was added to neutralize the mixture, and deionized water was added to wash the mixture. The precipitate was filtered and dried to obtain an aniline tetramer.

[0034] Step A3: Premix aniline tetramer, tetrabutylammonium bromide, and dichloromethane, then add the epoxy matrix and mix thoroughly. Heat to 35°C and reflux for 7 h. The ratio of epoxy matrix, aniline tetramer, tetrabutylammonium bromide, and dichloromethane is 10 mmol:30 mmol:40 mg:300 mL. After the reaction, remove dichloromethane by rotary evaporation to obtain a modified intermediate.

[0035] Step A4: Premix the modified intermediate, 2-iodoethanol, and dimethylacetamide, then add potassium carbonate and mix, and stir at 100° C. for 10 hours. The amount ratio of the modified intermediate, 2-iodoethanol, potassium carbonate, and dimethylacetamide is 10 mmol: 25 mmol: 0.9 g: 80 mL. After the reaction is completed, dimethylacetamide is removed by vacuum rotary evaporation. After the substrate is cooled, it is washed with ethanol and deionized water in sequence and dried to obtain a modified antistatic agent.

[0036] (2) Preparation of antistatic ABS sheet

[0037] The raw materials are calculated according to the following weight parts: 100 parts of ABS resin, PA-747 resin raw material is selected; 5.8 parts of modified antistatic agent, which is homemade in this embodiment; 0.3 parts of antioxidant, antioxidant 1010 and antioxidant 168 are selected and used in a weight ratio of 1:1; 0.5 parts of lubricant, industrial grade ethylene bisstearamide and KJ-H120 silicone masterbatch are selected and used in a weight ratio of 1:2.

[0038] The above raw materials were mixed evenly in a high-speed mixer, and the mixture was extruded by a twin-screw extruder. The barrel temperature was set as follows: feeding section, zone 1 180°C, zone 2 190°C, zone 3 200°C; melting section, zone 1 200°C, zone 2 210°C, zone 3 220°C; homogenization section, zone 1 220°C, zone 2 220°C, zone 3 230°C; the mixture was melt-mixed in the twin-screw extruder, the melt was extruded into a calender for calendering, and then cut after cooling to obtain ABS sheet.

[0039] Example 2, preparation of antistatic ABS sheet, the specific implementation process is as follows:

[0040] (1) Preparation of modified antistatic agent

[0041] Step A1: triethanolamine, triethylamine and dioxane are mixed and heated to 55°C. Epichlorohydrin is slowly added and stirred for 2 hours. Sodium hydroxide is then prepared into a saturated solution at room temperature, added to the reaction system and the temperature is continuously raised to 100°C and refluxed for 6 hours. The amount ratio of triethanolamine, epichlorohydrin, triethylamine, sodium hydroxide and dioxane is 0.1 mol: 0.32 mol: 2 mL: 8 g: 150 mL. After the reaction is completed, dioxane is removed by rotary evaporation. After the substrate is cooled, it is washed with deionized water and dried to obtain an epoxy matrix.

[0042] Step A2: N-phenyl-p-phenylenediamine, manganese dioxide, and acetone were mixed, and hydrochloric acid was added to adjust the pH to 1. The temperature of the water bath was controlled at 15°C. Ammonium persulfate was prepared into a 5 wt% aqueous solution at room temperature. The ammonium persulfate solution was slowly added and stirred for 10 hours. The hydrochloric acid used was 35% industrial concentrated hydrochloric acid. The amount ratio of N-phenyl-p-phenylenediamine, manganese dioxide, ammonium persulfate, and acetone was 0.1 mol: 30 mg: 3.5 g: 480 mL. After the reaction was completed, ammonia was added to neutralize the mixture, and deionized water was added to wash the mixture. The precipitate was filtered and dried to obtain an aniline tetramer.

[0043] Step A3: Premix aniline tetramer, tetrabutylammonium bromide, and dichloromethane, then add the epoxy matrix and mix thoroughly. Heat to 40°C and reflux for 5.5 h. The ratio of epoxy matrix, aniline tetramer, tetrabutylammonium bromide, and dichloromethane is 10 mmol:30 mmol:55 mg:350 mL. After the reaction, remove dichloromethane by rotary evaporation to obtain a modified intermediate.

[0044] Step A4: Premix the modified intermediate, 2-iodoethanol, and dimethylacetamide, then add potassium carbonate and mix, and stir at 120°C for 7 hours. The amount ratio of the modified intermediate, 2-iodoethanol, potassium carbonate, and dimethylacetamide is 10 mmol:35 mmol:1.4 g:100 mL. After the reaction is completed, dimethylacetamide is removed by vacuum rotary evaporation. After the substrate is cooled, it is washed with ethanol and deionized water in sequence and dried to obtain a modified antistatic agent.

[0045] (2) Preparation of antistatic ABS sheet

[0046] The raw materials are calculated according to the following weight parts: 100 parts of ABS resin, PA-747 resin raw material is selected; 7.2 parts of modified antistatic agent, which is homemade in this embodiment; 0.25 parts of antioxidant, antioxidant 1010 and antioxidant 168 are selected and used in a weight ratio of 1:1; 0.4 parts of lubricant, industrial grade ethylene bisstearamide and KJ-H120 silicone masterbatch are selected and used in a weight ratio of 1:2.

[0047] The above raw materials were mixed evenly in a high-speed mixer, and the mixture was extruded by a twin-screw extruder. The barrel temperature was set as follows: feeding section, zone 1 180°C, zone 2 190°C, zone 3 200°C; melting section, zone 1 210°C, zone 2 220°C, zone 3 220°C; homogenization section, zone 1 220°C, zone 2 230°C, zone 3 230°C; the mixture was melt-mixed in the twin-screw extruder, the melt was extruded into a calender for calendering, and then cut after cooling to obtain ABS sheet.

[0048] Example 3, preparing an antistatic ABS sheet, the specific implementation process is as follows:

[0049] (1) Preparation of modified antistatic agent

[0050] Step A1: triethanolamine, triethylamine and dioxane were mixed and heated to 50°C. Epichlorohydrin was slowly added and stirred for 2.8 hours. Sodium hydroxide was then prepared into a saturated solution at room temperature, added to the reaction system and the temperature was continued to rise to 100°C and refluxed for 6.5 hours. The amount ratio of triethanolamine, epichlorohydrin, triethylamine, sodium hydroxide and dioxane was 0.1 mol: 0.32 mol: 2 mL: 7 g: 140 mL. After the reaction was completed, the dioxane was removed by rotary evaporation. After the substrate was cooled, it was washed with deionized water and dried to obtain an epoxy matrix.

[0051] Step A2: N-phenyl-p-phenylenediamine, manganese dioxide, and acetone were mixed, and hydrochloric acid was added to adjust the pH to 1. The temperature of the water bath was controlled at 10°C. Ammonium persulfate was prepared into a 5 wt% aqueous solution at room temperature. The ammonium persulfate solution was slowly added and stirred for 12 hours. The hydrochloric acid used was 35% industrial concentrated hydrochloric acid. The amount ratio of N-phenyl-p-phenylenediamine, manganese dioxide, ammonium persulfate, and acetone was 0.1 mol: 25 mg: 3.2 g: 450 mL. After the reaction was completed, ammonia was added to neutralize the mixture, and deionized water was added to wash the mixture. The precipitate was filtered and dried to obtain an aniline tetramer.

[0052] Step A3: Premix aniline tetramer, tetrabutylammonium bromide, and dichloromethane, then add the epoxy matrix and mix thoroughly. Heat to 38°C and reflux for 6.5 h. The ratio of epoxy matrix, aniline tetramer, tetrabutylammonium bromide, and dichloromethane is 10 mmol:30 mmol:50 mg:320 mL. After the reaction, remove dichloromethane by rotary evaporation to obtain a modified intermediate.

[0053] Step A4: Premix the modified intermediate, 2-iodoethanol, and dimethylacetamide, then add potassium carbonate and mix, and stir at 110°C for 8 hours. The amount ratio of the modified intermediate, 2-iodoethanol, potassium carbonate, and dimethylacetamide is 10 mmol: 28 mmol: 1.1 g: 90 mL. After the reaction is completed, dimethylacetamide is removed by vacuum rotary evaporation. After the substrate is cooled, it is washed with ethanol and deionized water in sequence and dried to obtain a modified antistatic agent.

[0054] (2) Preparation of antistatic ABS sheet

[0055] The raw materials are calculated according to the following weight parts: 100 parts of ABS resin, PA-747 resin raw material is selected; 6.5 parts of modified antistatic agent, which is homemade in this embodiment; 0.27 parts of antioxidant, antioxidant 1010 and antioxidant 168 are selected and used in a weight ratio of 1:1; 0.4 parts of lubricant, industrial grade ethylene bisstearamide and KJ-H120 silicone masterbatch are selected and used in a weight ratio of 1:2.

[0056] The above raw materials were mixed evenly in a high-speed mixer, and the mixture was extruded by a twin-screw extruder. The barrel temperature was set as follows: feeding section, zone 1 180°C, zone 2 190°C, zone 3 200°C; melting section, zone 1 200°C, zone 2 210°C, zone 3 210°C; homogenization section, zone 1 220°C, zone 2 220°C, zone 3 230°C; the mixture was melt-kneaded in a twin-screw extruder, the melt was extruded into a calender for calendering, and then cut after cooling to obtain ABS sheet.

[0057] Comparative Example 1, referring to Example 3, the modified antistatic agent was replaced with 2.5 parts of antistatic agent SN and 4 parts of polyaniline powder, and the rest of the implementation process was exactly the same.

[0058] Comparative Example 2: Referring to Comparative Example 1, an equal amount of polyaniline powder was replaced with the aniline tetramer prepared in Example 3, and the rest of the implementation process was exactly the same.

[0059] Samples were taken from the prepared plates and subjected to tensile testing according to ISO 527-1-2019; impact testing according to ISO 179-1-2023; abrasion testing according to ASTM D1044-24, with a load of 1 kg and 500 revolutions; resistivity testing according to ASTM D257-14, in an environment of 23°C and 65% relative humidity; and electrostatic dissipation time testing according to ANSI / ESD S20.20-2021, with a voltage dissipation range of 5 kV to 100 V. The specific test results are shown in Tables 1 and 2:

[0060] Table 1 Test results of sample physical properties

[0061] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Tensile strength / MPa 35.5 32.7 34.1 30.9 32.7 <![CDATA[Impact strength / kJ·m -2 > 29.8 25.3 27.6 28.2 24.6 Wear amount / mg 9.7 12.5 10.4 35.7 54.1

[0062] Table 2 Test results of electrostatic properties of samples

[0063] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Surface resistivity / Ω <![CDATA[6.1×10 8 ]]> <![CDATA[5.3×10 8 ]]> <![CDATA[5.7×10 8 ]]> <![CDATA[4.9×10 9 ]]> <![CDATA[3.3×10 9 ]]> Volume resistivity / Ω·cm <![CDATA[3.9×10 9 ]]> <![CDATA[2.4×10 9 ]]> <![CDATA[2.9×10 9 ]]> <![CDATA[7.2×10 9 ]]> <![CDATA[9.5×10 9 ]]> Dissipation time / s 0.14 0.08 0.11 1.26 1.93

[0064] Combined with the test results in Tables 1 and 2, it can be seen that the ABS sheets prepared above maintain good mechanical properties. Among them, the surface wear of the sheets of the embodiment is lower than that of the comparative example, showing a certain degree of wear resistance enhancement. In the electrostatic performance test, the resistivity of the embodiment is lower than that of the comparative example, and in particular, the electrostatic dissipation time is significantly lower than that of the comparative example, showing excellent antistatic ability.

[0065] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. An antistatic ABS sheet, characterized in that: The raw materials include the following according to weight parts: 100 parts of ABS resin, 5.8-7.2 parts of modified antistatic agent, 0.25-0.3 parts of antioxidant and 0.4-0.5 parts of lubricant; The modified antistatic agent is prepared by the following method: Step A1: Triethanolamine, triethylamine, and dioxane were mixed, heated to 45-55°C, and then epichlorohydrin was slowly added and stirred for 2-3 hours. Then, sodium hydroxide solution was added and the temperature was continued to rise to 100°C and refluxed for 6-8 hours to prepare an epoxy matrix; Step A2: N-phenyl-p-phenylenediamine, manganese dioxide, and acetone were mixed, hydrochloric acid was added to adjust the pH to 1, the temperature of the water bath was controlled at 5-15°C, and ammonium persulfate solution was slowly added and stirred for 10-13 hours to prepare aniline tetramer; Step A3: premix aniline tetramer, tetrabutylammonium bromide and dichloromethane, then add epoxy matrix and mix thoroughly, heat to 35-40°C and reflux for 5.5-7h to prepare a modified intermediate; Step A4: premix the modified intermediate, 2-iodoethanol and dimethylacetamide, add potassium carbonate, mix, and stir at 100-120° C. for 7-10 hours to prepare a modified antistatic agent.

2. The antistatic ABS sheet according to claim 1, characterized in that: The usage ratio of triethanolamine, epichlorohydrin, triethylamine, sodium hydroxide and dioxane is 0.1 mol: 0.31-0.32 mol: 1.5-2 mL: 6.5-8 g: 120-150 mL.

3. The antistatic ABS sheet according to claim 2, characterized in that: The usage ratio of N-phenyl-p-phenylenediamine, manganese dioxide, ammonium persulfate and acetone is 0.1 mol: 25-30 mg: 2.8-3.5 g: 420-480 mL.

4. The antistatic ABS sheet according to claim 3, characterized in that: The usage ratio of the epoxy group, the aniline tetramer, tetrabutylammonium bromide and dichloromethane is 10 mmol: 30 mmol: 40-55 mg: 300-350 mL.

5. The antistatic ABS sheet according to claim 4, characterized in that: The usage ratio of the modified intermediate, 2-iodoethanol, potassium carbonate and dimethylacetamide is 10 mmol: 25-35 mmol: 0.9-1.4 g: 80-100 mL.

6. The antistatic ABS sheet according to claim 1, characterized in that: The lubricant is compounded from ethylene bisstearamide and silicone masterbatch.

7. The method for preparing an antistatic ABS sheet according to any one of claims 1 to 6, characterized in that: Specifically, the raw materials of each component are mixed evenly, the mixture is melt-kneaded by a twin-screw extruder, the melt is extruded and then calendered, and the ABS sheet is cut after cooling.

8. The method for preparing an antistatic ABS sheet according to claim 7, characterized in that: During the melt mixing process, the barrel temperature of the twin-screw extruder was set as follows: 180-200°C in the feeding section, 200-220°C in the melting section, and 220-230°C in the homogenizing section.

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