An antistatic waterborne polyurea coating and its preparation method
By combining PVP-modified carbon nanotubes with polyvinylpyrrolidone copolymer, the compatibility and dispersibility issues between carbon nanotubes and polyurea coatings were resolved, resulting in an antistatic waterborne polyurea coating with high electrical conductivity, high thermal conductivity, and excellent mechanical properties.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Filing Date
- 2024-09-12
- Publication Date
- 2026-05-26
AI Technical Summary
In existing technologies, carbon nanotubes have poor compatibility with polyurea coatings, resulting in poor conductivity. Furthermore, the uneven dispersion of carbon nanotubes affects processability and safety, while the acid pickling process causes environmental problems.
PVP-modified carbon nanotubes and polyvinylpyrrolidone copolymers were used as component B. The carbon nanotubes were treated by grinding and spray drying, and combined with terminal isocyanate prepolymers as component A to form a uniform conductive and thermally conductive network, thereby improving the dispersibility and compatibility of carbon nanotubes in polyurea coatings.
It significantly improves the electrical and thermal conductivity of the coating, enhances its antistatic and thermal conductivity, improves its mechanical properties, and creates better interfacial compatibility and reinforcement.
Smart Images
Figure CN118978848B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of polyurea technology, specifically to an antistatic waterborne polyurea coating and its preparation method. Background Technology
[0002] Polyurea coatings possess advantages such as good flexibility, fast curing speed, low curing stability, and strong water resistance. They are widely used in various fields including construction, furniture building materials, and marine engineering. However, in certain special applications, such as electrical equipment, oil storage equipment, precision electronic instruments, and aerospace equipment, the accumulation of static electricity may lead to explosions or other hazards. Therefore, developing an antistatic polyurea coating is an important research topic.
[0003] Carbon nanotubes are high-performance nanomaterials that can improve the conductivity, antistatic properties, and mechanical strength of polymer materials. However, carbon nanotubes have entanglement characteristics, and their interfaces are incompatible with most polymer materials. Therefore, when carbon nanotubes and polymer materials are mixed, uneven dispersion phenomena such as agglomeration may occur. This results in the need to add a large amount of carbon nanotubes to achieve the conductivity or antistatic effect. However, this will make the coating flow poorer and produce more undispersed particles, affecting the processability and appearance. It may even cause the accumulation of local charges, affecting safety.
[0004] Patent application number 2021100495610 discloses an antistatic polyurea coating for the petroleum and petrochemical industry and its preparation method. The method involves acid washing and filtering carbon nanotubes to disperse them in polymer materials such as polyisocyanates, followed by spraying to obtain the antistatic polyurea coating. This patent improves the interface between carbon nanotubes and the polymer substrate through hydrochloric acid treatment followed by filtration. However, this preparation process generates a significant amount of acidic wastewater, raising environmental concerns and making it unsuitable for mass production. In summary, developing carbon nanotube-containing antistatic polyurea coatings is an important research topic. However, current production processes encounter the following problems: 1. The problem of carbon nanotube interface modification. A common method is acid washing to improve the interface between carbon nanotubes and the polymer substrate, but this method generates a large amount of acidic wastewater, causing significant pollution. 2. Carbon nanotube dispersion problem: Due to the high aspect ratio of carbon nanotubes, they have high electrical conductivity. However, because carbon nanotubes tend to entangle with each other during production, even if the interface is improved, it is still difficult to distribute them evenly. This results in the need for a large amount of carbon nanotubes to achieve good conductivity, which is much higher than the theoretical value. Summary of the Invention
[0005] This invention solves the problems of poor compatibility between carbon nanotubes and polyurea coatings, as well as the poor electrical conductivity of polyurea coatings.
[0006] The present invention provides a technical solution: an antistatic waterborne polyurea coating, comprising component A and component B. Component A is 100 parts by weight of terminal isocyanate prepolymer. Component B consists of 6.8-13.7 parts by weight of diamine chain extender, 42-60 parts by weight of polyvinylpyrrolidone copolymer, and 1-4 parts by weight of PVP-modified carbon nanotubes.
[0007] The preparation method of polyvinylpyrrolidone copolymer is as follows: N-vinylpyrrolidone and Boc-based polymeric monomers are added to N,N-dimethylformamide, heated to 70-85℃ in a nitrogen atmosphere, and azobisisobutyronitrile is added. The reaction is carried out for 10-18 hours. After cooling, petroleum ether is added to precipitate the product. After filtration, the precipitate is added to dichloromethane, and trifluoroacetic acid is added. The mixture is stirred and reacted for 5-8 hours. The product is then distilled under reduced pressure, washed with saturated sodium bicarbonate solution, and dried to obtain polyvinylpyrrolidone copolymer.
[0008] Preferably, the mass ratio of N-vinylpyrrolidone, Boc-based polymeric monomer, and azobisisobutyronitrile is (5-7):(3-5):(0.07-0.08).
[0009] Preferably, the preparation method of the Boc-based polymer monomer is as follows: sodium hydride is added to N,N-dimethylformamide under ice bath, and 2-bromoethyl acrylate and Boc-cysteine (CAS Registry No. 20887-95-0) are added under nitrogen atmosphere; the mass ratio of sodium hydride, 2-bromoethyl acrylate and Boc-cysteine is (0.72-0.84):1:(1.3-1.4). The reaction is then carried out at 20-30℃ for 18-24 h. Hydrochloric acid is added to the solution to adjust the pH to 2-3, and then water and dichloromethane are added. The mixture is extracted and separated, and the organic phase is dried with anhydrous sodium sulfate. After filtration, the mixture is distilled under reduced pressure, and the product is recrystallized with dichloromethane to obtain the Boc-based polymer monomer.
[0010] Preferably, the preparation method of the terminal isocyanate prepolymer in component A is as follows: dry polyether polyol and diisocyanate compound are mixed in a molar ratio of 1:(2.2-2.4), wherein the diisocyanate compound is 2,4-toluene diisocyanate or diphenylmethane-4,4'-diisocyanate; the mixture is heated to 80-90°C in a nitrogen atmosphere and reacted for 1-2 hours to obtain the terminal isocyanate prepolymer.
[0011] Preferably, the diamine chain extender in component B includes 1,4-butanediamine, m-phenylenediamine, and diethyltoluenediamine.
[0012] Preferably, the preparation method of PVP-modified carbon nanotubes in component B is as follows: carbon nanotubes with a mass ratio of 1:(0.3-0.5):(16-20) and polyvinylpyrrolidone dispersant and water are added to the grinding tank of a grinder and ground with zirconium beads until the length of the carbon nanotubes is less than 10 μm. The grinding liquid is then spray-dried to obtain PVP-modified carbon nanotubes.
[0013] Preferred preparation method of antistatic waterborne polyurea coating: add component B: diamine chain extender, polyvinylpyrrolidone copolymer, and PVP modified carbon nanotubes to water; after stirring, add component A terminal isocyanate prepolymer to obtain antistatic waterborne polyurea coating.
[0014] The technical advantage of this invention is that by using polyvinylpyrrolidone (PVP) as a dispersant to grind and modify carbon nanotubes, PVP-modified carbon nanotubes are obtained. This effectively improves the dispersibility of carbon nanotubes.
[0015] A substitution reaction was carried out using 2-bromoethyl acrylate and the thiol group of Boc-cysteine to obtain a Boc-based polymeric monomer, which was then copolymerized with N-vinylpyrrolidone. Finally, the N-Boc protecting group was removed to obtain a polyvinylpyrrolidone copolymer with hydrophilic carboxyl and amino groups in the side chain.
[0016] This invention uses isocyanate-terminated prepolymer as component A of a polyurea coating; and diamine chain extender, polyvinylpyrrolidone copolymer, and PVP-modified carbon nanotubes as component B. After modification with PVP dispersant, the carbon nanotubes exhibit better dispersibility in water-based polyurea coatings, forming a uniform conductive and thermally conductive network, significantly improving the electrical and thermal conductivity of the coating film, and providing excellent antistatic and thermal conductivity properties. Simultaneously, it enhances the mechanical properties of the polyurea.
[0017] The polyvinylpyrrolidone copolymer of this invention contains hydrophilic carboxyl and amino groups, exhibiting excellent dispersibility in waterborne polyurea coatings. Furthermore, the molecular side chains contain a large number of amino groups, which can react with the isocyanate groups of the terminal isocyanate prepolymer to form a three-dimensional chemical crosslinking effect. This is beneficial for improving the crosslinking degree of the polyurea and enhancing its mechanical properties. Simultaneously, after the copolymer reacts with the terminal isocyanate prepolymer, the resulting polyurea contains polyvinylpyrrolidone segments, which have excellent interfacial compatibility with the polyvinylpyrrolidone on the surface of modified carbon nanotubes. This enhances the interfacial interaction between the carbon nanotubes and the polyurea, improving their compatibility and giving the carbon nanotubes a better reinforcing effect. Through this synergistic effect, the tensile properties and tear strength of the polyurea coating are enhanced. Attached Figure Description
[0018] Figure 1 This is the reaction formula for the preparation of Boc-based polymer monomers.
[0019] Figure 2 This is the reaction formula for the preparation of polyvinylpyrrolidone copolymer. Detailed Implementation
[0020] To better understand the technical solution of the present invention, the following detailed description of the above content of the present invention is provided through specific embodiments.
[0021] Example 1
[0022] (1) Add 0.5g of carbon nanotubes, 0.2g of polyvinylpyrrolidone dispersant, and 8mL of water to the grinding tank of a grinder and grind with zirconium beads until the length of the carbon nanotubes is less than 10um. Spray dry the grinding liquid to obtain PVP modified carbon nanotubes.
[0023] (2) 2.16 g of sodium hydride was added to 70 mL of N,N-dimethylformamide under ice bath, and 3 g of 2-bromoethyl acrylate and 4.1 g of Boc-cysteine were added under nitrogen atmosphere. The reaction was carried out at 30 °C for 18 h. Hydrochloric acid was added to the solution to adjust the pH to 2, and then water and dichloromethane were added. The mixture was extracted and separated. The organic phase was dried with anhydrous sodium sulfate, filtered, and then distilled under reduced pressure. The product was recrystallized with dichloromethane to obtain the Boc-based polymer monomer.
[0024] (3) Add 32g of N-vinylpyrrolidone and 18g of Boc-based polymer monomer to 300mL of N,N-dimethylformamide, heat to 70℃ in a nitrogen atmosphere, add 0.35g of azobisisobutyronitrile, react for 18h, cool and add petroleum ether to precipitate, filter and add the precipitate to dichloromethane, add trifluoroacetic acid, stir and react for 5h, distill under reduced pressure, wash with saturated sodium bicarbonate solution, dry to obtain polyvinylpyrrolidone copolymer.
[0025] (4) Mix 50 mmol of dry polyether polyol N220 and 120 mmol of diphenylmethane-4,4'-diisocyanate, heat to 90 °C in a nitrogen atmosphere, and react for 1 h to obtain terminal isocyanate prepolymer.
[0026] (5) Add 6.8g of diethyltoluene diamine, 42g of polyvinylpyrrolidone copolymer and 1g of PVP modified carbon nanotubes to 150mL of water; after stirring, add 100g of terminal isocyanate prepolymer to obtain antistatic waterborne polyurea coating.
[0027] Example 2
[0028] (1) Add 0.5g of carbon nanotubes, 0.25g of polyvinylpyrrolidone dispersant, and 10mL of water to the grinding tank of a grinder and grind with zirconium beads until the length of the carbon nanotubes is less than 10um. Then spray dry the grinding liquid to obtain PVP modified carbon nanotubes.
[0029] (2) 2.52 g of sodium hydride was added to 60 mL of N,N-dimethylformamide under ice bath, and 3 g of 2-bromoethyl acrylate and 3.9 g of Boc-cysteine were added under nitrogen atmosphere. The reaction was carried out at 20 °C for 24 h. Hydrochloric acid was added to the solution to adjust the pH to 3, and then water and dichloromethane were added. The mixture was extracted and separated. The organic phase was dried with anhydrous sodium sulfate, filtered, and then distilled under reduced pressure. The product was recrystallized with dichloromethane to obtain the Boc-based polymer monomer.
[0030] (3) Add 25g of N-vinylpyrrolidone and 25g of Boc-based polymer monomer to 300mL of N,N-dimethylformamide, heat to 80℃ in a nitrogen atmosphere, add 0.4g of azobisisobutyronitrile, react for 18h, cool and add petroleum ether to precipitate, filter and add the precipitate to dichloromethane, add trifluoroacetic acid, stir and react for 6h, distill under reduced pressure, wash with saturated sodium bicarbonate solution, dry to obtain polyvinylpyrrolidone copolymer.
[0031] (4) Mix 50 mmol of dry polyether polyol N220 and 120 mmol of 2,4-toluene diisocyanate, heat to 80 °C in a nitrogen atmosphere, and react for 2 h to obtain terminal isocyanate prepolymer.
[0032] (5) Add 11.2g m-phenylenediamine, 48g polyvinylpyrrolidone copolymer and 2g PVP modified carbon nanotubes to 150mL of water; after stirring, add 100g terminal isocyanate prepolymer to obtain antistatic waterborne polyurea coating.
[0033] Example 3
[0034] (1) Add 0.5g of carbon nanotubes, 0.15g of polyvinylpyrrolidone dispersant, and 8mL of water to the grinding tank of a grinder and grind with zirconium beads until the length of the carbon nanotubes is less than 10um. Then spray dry the grinding liquid to obtain PVP modified carbon nanotubes.
[0035] (2) 2.52 g of sodium hydride was added to 70 mL of N,N-dimethylformamide under ice bath, and 3 g of 2-bromoethyl acrylate and 4.2 g of Boc-cysteine were added under nitrogen atmosphere. The reaction was carried out at 25 °C for 18 h. Hydrochloric acid was added to the solution to adjust the pH to 2, and then water and dichloromethane were added. The mixture was extracted and separated. The organic phase was dried with anhydrous sodium sulfate, filtered, and then distilled under reduced pressure. The product was recrystallized with dichloromethane to obtain the Boc-based polymer monomer.
[0036] (3) Add 35g of N-vinylpyrrolidone and 15g of Boc-based polymer monomer to 250mL of N,N-dimethylformamide. Heat to 85℃ in a nitrogen atmosphere, add 0.35g of azobisisobutyronitrile, react for 10h, cool and add petroleum ether to precipitate the precipitate. After filtration, add the precipitate to dichloromethane, add trifluoroacetic acid, stir and react for 5h, distill under reduced pressure, wash with saturated sodium bicarbonate solution, dry and obtain polyvinylpyrrolidone copolymer.
[0037] (4) Mix 50 mmol of dry polyether polyol N220 and 110 mmol of 2,4-toluene diisocyanate, heat to 90 °C in a nitrogen atmosphere, and react for 1 h to obtain terminal isocyanate prepolymer.
[0038] (5) Add 6.8g of 1,4-butanediamine, 54g of polyvinylpyrrolidone copolymer and 3g of PVP modified carbon nanotubes to 200mL of water; after stirring, add 100g of terminal isocyanate prepolymer to obtain antistatic waterborne polyurea coating.
[0039] Example 4
[0040] (1) Add 28g of N-vinylpyrrolidone and 22g of Boc-based polymer monomer (prepared according to the method of Example 1) to 300mL of N,N-dimethylformamide, heat to 85°C in a nitrogen atmosphere, add 0.38g of azobisisobutyronitrile, react for 12h, cool and add petroleum ether to precipitate, filter and add the precipitate to dichloromethane, add trifluoroacetic acid, stir and react for 8h, distill under reduced pressure, wash with saturated sodium bicarbonate solution, dry to obtain polyvinylpyrrolidone copolymer.
[0041] (2) Add 13.7g of diethyltoluene diamine, 60g of polyvinylpyrrolidone copolymer, and 4g of PVP-modified carbon nanotubes (prepared according to the method of Example 1) to 200mL of water; after stirring, add 100g of terminal isocyanate prepolymer (prepared according to the method of Example 1) to obtain an antistatic waterborne polyurea coating.
[0042] Comparative Example 1
[0043] (1) Add 6.8g of diethyltoluene diamine and 42g of amino-terminated polyether D2000 to 150mL of water; after stirring, add 100g of isocyanate-terminated prepolymer to obtain polyurea coating.
[0044] Comparative Example 2
[0045] (1) Add 6.8g of diethyltoluene diamine and 42g of polyvinylpyrrolidone copolymer to 150mL of water; after stirring, add 100g of terminal isocyanate prepolymer to obtain polyurea coating.
[0046] Comparative Example 3
[0047] (1) Add 6.8g of diethyltoluenediamine, 42g of polyvinylpyrrolidone copolymer and 1g of carbon nanotubes to 150mL of water; after stirring, add 100g of terminal isocyanate prepolymer to obtain polyurea coating.
[0048] Comparative Example 4
[0049] (1) Add 6.8g of diethyltoluenediamine, 42g of polyvinylpyrrolidone, and 1g of PVP-modified carbon nanotubes to 150mL of water; after stirring, add 100g of terminal isocyanate prepolymer to obtain polyurea coating.
[0050] Comparative Example 5
[0051] (1) Add 18g of Boc-based monomer to 300mL of N,N-dimethylformamide, heat to 70℃ in a nitrogen atmosphere, add 0.35g of azobisisobutyronitrile, react for 18h, cool and add petroleum ether to precipitate, filter and add the precipitate to dichloromethane, add trifluoroacetic acid, stir and react for 5h, distill under reduced pressure, wash with saturated sodium bicarbonate solution, dry and obtain acrylate polymer.
[0052] (2) Add 6.8g of diethyltoluenediamine, 42g of acrylate polymer, and 1g of PVP-modified carbon nanotubes to 150mL of water; after stirring, add 100g of terminal isocyanate prepolymer to obtain polyurea coating.
[0053] Antistatic waterborne polyurea coating was sprayed onto the substrate surface using a spray gun, cured at room temperature for 7 days, and dried to form a film for performance testing. The electrical conductivity of the polyurea film was measured using a high-resistivity meter; the film samples were circular, 20 cm in diameter and 8 mm thick. The thermal conductivity of the film was tested using a thermal conductivity meter according to the transient planar heat source method.
[0054] The polyurea coating was poured into a mold, cured at room temperature for 7 days, and then dried to form an adhesive film. The tensile properties of the adhesive film were tested according to GB / T528-2009 standard, and the tear strength was tested according to GB / T 529-2008 standard.
[0055] The test results are shown in the table below.
[0056]
[0057] Testing revealed that the polyurea coatings of Examples 1-4, with the addition of polyvinylpyrrolidone copolymer and PVP-modified carbon nanotubes, exhibited better dispersibility in the polyurea waterborne coatings after modification with PVP dispersant. This resulted in the formation of a uniform conductive and thermally conductive network, significantly improving the electrical and thermal conductivity of the coating film and providing excellent antistatic and thermal conductivity properties. Simultaneously, it enhanced the mechanical properties of the polyurea. Furthermore, the added polyvinylpyrrolidone copolymer contains hydrophilic carboxyl groups, exhibiting excellent dispersibility in waterborne polyurea coatings. Its molecular side chains contain a large number of amino groups, which can react with the isocyanate groups of the terminal isocyanate prepolymer, forming a three-dimensional chemical crosslinking effect. This is beneficial for improving the crosslinking degree of the polyurea and enhancing its mechanical properties. Simultaneously, the polyurea formed after the copolymer reacts with the terminal isocyanate prepolymer contains polyvinylpyrrolidone segments, exhibiting excellent interfacial compatibility with the polyvinylpyrrolidone on the modified carbon nanotube surface. This enhances the interfacial interaction between the carbon nanotubes and the polyurea, improving their compatibility and giving the carbon nanotubes a better reinforcing effect. Through this synergistic effect, the tensile properties and tear strength of the polyurea coating are enhanced.
[0058] The difference between Comparative Example 1 and Example 1 is that PVP-modified carbon nanotubes were not added, and amino-terminated polyether D2000 was used instead of polyvinylpyrrolidone copolymer. Amino-terminated polyether D2000 only contains amino groups at the end positions and does not contain a large number of amino groups in the side chains. It cannot undergo a three-dimensional chemical crosslinking reaction with the isocyanate-terminated prepolymer, making it difficult to effectively improve the degree of crosslinking of polyurea. The tensile strength and other mechanical properties of polyurea are low. In addition, without the addition of PVP-modified carbon nanotubes, the thermal conductivity and electrical conductivity of polyurea are low.
[0059] The difference between Comparative Example 2 and Example 1 is that PVP-modified carbon nanotubes were not added, resulting in lower thermal and electrical conductivity of the polyurea. Furthermore, its tensile strength and other mechanical properties were lower than those of Example 1. However, the addition of polyvinylpyrrolidone copolymer, with its molecular side chains containing a large number of amino groups, allows it to react with the isocyanate groups of the terminal isocyanate prepolymer, forming a three-dimensional chemical crosslinking effect. This improves the degree of crosslinking of the polyurea, enhancing its mechanical properties, and resulting in higher tensile strength and breaking strength compared to Comparative Example 1.
[0060] The difference between Comparative Example 3 and Example 1 is that unmodified carbon nanotubes were added. The carbon nanotubes were poorly dispersed, failing to form a uniform conductive and thermally conductive network, resulting in lower electrical and thermal conductivity of the coating film compared to Example 1. Furthermore, the carbon nanotubes showed poor compatibility with polyurea, leading to inadequate reinforcing effect and lower tensile and tensile strength compared to Example 1.
[0061] The difference between Comparative Example 4 and Example 1 is that polyvinylpyrrolidone was used instead of polyvinylpyrrolidone copolymer. Its side chain does not contain amino groups, so it cannot undergo crosslinking reaction with terminal isocyanate prepolymer, resulting in the mechanical properties of polyurea being lower than those of Example 1.
[0062] The difference between Comparative Example 5 and Example 1 is that N-vinylpyrrolidone was not added during the preparation of the acrylate polymer. Its side chains contain a large number of amino groups, which can undergo crosslinking reactions with the terminal isocyanate prepolymer, improving the mechanical properties of the polyurea. However, the resulting polyurea does not contain polyvinylpyrrolidone segments, resulting in lower interfacial interaction and compatibility with the PVP-modified carbon nanotubes. Consequently, the reinforcing effect of the carbon nanotubes is lower than in Example 1, and the tensile strength and other mechanical properties are also lower than in Example 1.
[0063] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An antistatic waterborne polyurea coating, characterized in that, The antistatic waterborne polyurea coating comprises component A and component B; Component A is 100 parts by weight of terminal isocyanate prepolymer; Component B consists of 6.8-13.7 parts by weight of diamine chain extender, 42-60 parts by weight of polyvinylpyrrolidone copolymer, and 1-4 parts by weight of PVP-modified carbon nanotubes. The preparation method of the polyvinylpyrrolidone copolymer is as follows: N-vinylpyrrolidone and Boc-based polymeric monomers are added to N,N-dimethylformamide, heated to 70-85℃ in a nitrogen atmosphere, azobisisobutyronitrile is added, the reaction is carried out for 10-18h, petroleum ether is added after cooling to precipitate the product, the product is filtered and added to dichloromethane, trifluoroacetic acid is added, the reaction is stirred for 5-8h, vacuum distillation is carried out, the product is washed with saturated sodium bicarbonate solution and dried to obtain the polyvinylpyrrolidone copolymer; The structural formula of the Boc-based polymer monomer is:
2. The antistatic waterborne polyurea coating according to claim 1, characterized in that, The mass ratio of N-vinylpyrrolidone, Boc-based polymeric monomer, and azobisisobutyronitrile is (5-7):(3-5):(0.07-0.08).
3. The antistatic waterborne polyurea coating according to claim 2, characterized in that, The method for preparing the Boc-based polymer monomer is as follows: sodium hydride is added to N,N-dimethylformamide under an ice bath, 2-bromoethyl acrylate and Boc-cysteine are added under a nitrogen atmosphere, and then the reaction is carried out at 20-30℃ for 18-24 h. Hydrochloric acid is added to the solution to adjust the pH to 2-3, and then water and dichloromethane are added. The mixture is extracted and separated, the organic phase is dried with anhydrous sodium sulfate, filtered, and then distilled under reduced pressure. The product is recrystallized with dichloromethane to obtain the Boc-based polymer monomer.
4. The antistatic waterborne polyurea coating according to claim 3, characterized in that, The mass ratio of sodium hydride, 2-bromoethyl acrylate, and Boc-cysteine is (0.72-0.84):1:(1.3-1.4).
5. The antistatic waterborne polyurea coating according to claim 1, characterized in that, The preparation method of the terminal isocyanate prepolymer in component A is as follows: dry polyether polyol and diisocyanate compound in a molar ratio of 1:(2.2-2.4) are mixed and heated to 80-90℃ in a nitrogen atmosphere for 1-2 hours to obtain the terminal isocyanate prepolymer.
6. The antistatic waterborne polyurea coating according to claim 5, characterized in that, The diisocyanate compound is 2,4-toluene diisocyanate or diphenylmethane-4,4'-diisocyanate.
7. The antistatic waterborne polyurea coating according to claim 1, characterized in that, The diamine chain extenders in component B include 1,4-butanediamine, m-phenylenediamine, and diethyltoluenediamine.
8. The antistatic waterborne polyurea coating according to claim 1, characterized in that, The preparation method of PVP-modified carbon nanotubes in component B is as follows: carbon nanotubes, polyvinylpyrrolidone dispersant, and water are added to the grinding tank of a grinder and ground with zirconium beads until the length of the carbon nanotubes is less than 10 μm. The grinding liquid is then spray-dried to obtain PVP-modified carbon nanotubes.
9. The antistatic waterborne polyurea coating according to claim 8, characterized in that, The mass ratio of the carbon nanotubes, polyvinylpyrrolidone, and water is 1:(0.3-0.5):(16-20).
10. The method for preparing the antistatic waterborne polyurea coating according to any one of claims 1-9, characterized in that, The preparation method is as follows: add component B to water: diamine chain extender, polyvinylpyrrolidone copolymer, and PVP-modified carbon nanotubes; After stirring, the terminal isocyanate prepolymer of component A is added to obtain an antistatic waterborne polyurea coating.