Oil antistatic agent and preparation method thereof

Abstract

The invention relates to the technical field of antistatic agents, and particularly discloses an oil product antistatic agent and a preparation method thereof. The modified polysulfone is obtained by mixing and treating the following raw materials in parts by mass: 35-40 parts of xylene, 20-25 parts of composite polyamine, 15-20 parts of polysulfone, 5-8 parts of oligomeric dopamine and 1-2 parts of an activating agent, the preparation method comprises the following steps: taking composite polyamine, mixing with oligomeric dopamine, dispersing with xylene, then adding an activator, stirring, then adding polysulfone, and continuously treating, thereby obtaining the product. The preparation method of the composite polyamine comprises the following steps: taking epichlorohydrin, dispersing, adding a mixed amine source, heating, adding sodium carbonate, continuously stirring, cooling, adding a deprotection agent, filtering after treatment, taking a liquid part, drying by distillation, washing, drying again, and grinding to obtain the composite polyamine. The oil product antistatic agent prepared by the invention has relatively strong antistatic capability and relatively long duration time, and can form a firmer double-electric-layer structure.

Description

Technical Field

[0001] The present application relates to the technical field of antistatic agents, and more specifically, to an oil antistatic agent and a preparation method thereof. Background Art

[0002] Antistatic agents are additives that reduce static electricity accumulation within products and accelerate static dissipation. They effectively prevent static hazards such as dust collection, spark discharge, and other electrostatic hazards. During oil extraction, refining, storage, transportation, and use, static charge can easily accumulate due to frequent friction and impact between oil and pipelines, tanks, and pumping equipment. When the oil surface potential reaches the critical breakdown value, the resulting sparks are powerful enough to ignite oil vapor and cause an explosion. Therefore, antistatic agents are often added during oil transportation to improve the oil's conductivity and thus prevent the accumulation of static charge.

[0003] Oil antistatic agents are mainly polyamine and polysulfone compound compositions, wherein the amino structure on the polyamine molecule can ionize cations (R-NH3 + ), adsorbed onto solid surfaces to form a compact layer, while the sulfone group (-SO2-) on polysulfone has strong polarity, stabilizing the compact layer and promoting the release of static charges within the oil. When used, the two effectively combine to form a relatively strong "double-layer" structure on the solid surface; this structure allows a conductive network to be constructed within the oil phase, improving the conductivity of the oil and accelerating the leakage of internal charges, thereby reducing the risk of static charge accumulation. However, conventional approaches primarily involve directly mixing or compounding polyamine and polysulfone molecules for use together. Direct mixing makes it difficult for the polyamine and polysulfone molecules to form an effective combination, while compounding reduces the antistatic agent's functional groups, both of which are detrimental to the synergistic effect of the polyamine and polysulfone. Furthermore, since the antistatic agent is only added to the oil at the PPM level, the dispersion effect of the oil phase further reduces the effectiveness of the combined action of the polyamine and polysulfone, making the resulting "double-layer" more susceptible to shedding and disintegration.

[0004] The Chinese patent application document with application publication number CN109355115A discloses a polysulfone-polyamine composite oil antistatic agent, its synthesis method and use method. In the scheme, polyamine and polysulfone components are prepared separately, and the two components are mixed with substances such as dodecylbenzenesulfonic acid to obtain an antistatic agent. Through the synergistic effect of various substances, the conductivity of the oil can be improved and the effect of the antistatic agent can be enhanced.

[0005] While the aforementioned application document can improve the effectiveness of the polyamine and polysulfone combination, its effect is still relatively limited. Because the polyamine and polysulfone molecules do not form a strong interaction structure, the "double layer" formed after adsorption to the metal matrix is still easily detached and disintegrated due to the movement of the oil, thus reducing the antistatic ability of the oil antistatic agent. Therefore, it is necessary to find an oil antistatic agent that can strengthen the "double layer" and improve the conductivity of the oil. Summary of the Invention

[0006] In order to further strengthen the firmness of the "double electric layer" and at the same time improve the antistatic ability of the oil antistatic agent, the present application provides an oil antistatic agent and a preparation method thereof.

[0007] In a first aspect, the present application provides a method for preparing an antistatic agent for oil products, which is obtained by mixing raw materials including the following parts by mass: 35-40 parts of xylene, 20-25 parts of composite polyamine, 15-20 parts of polysulfone, 5-8 parts of oligodopamine, and 1-2 parts of an activator; the preparation steps include the following: Take the composite polyamine, mix it with oligodopamine, disperse it in xylene, add the activator, stir it, then add polysulfone and continue to process it to obtain; The preparation steps of the composite polyamine include the following: Take epichlorohydrin, disperse it, add a mixed amine source, heat it, then add sodium carbonate, continue stirring, then cool it down and add a deprotecting agent, filter the liquid part after treatment, evaporate it to dryness, wash it, dry it again and grind it to obtain a composite polyamine.

[0008] By employing the above technical solution, a tightly coupled composite structure can be formed by mixing a composite polyamine, oligodopamine, and polysulfone. The composite polyamine and oligodopamine react with an activator to form an acetalization reaction, forming a preliminary composite structure anchored by acetal sites. The addition of polysulfone further enhances the entanglement of polar polysulfone molecules on the composite polyamine through the "claw"-like structure created by the enriched phenolic hydroxyl groups of the oligodopamine, ultimately resulting in a polyamine-polysulfone complex maintained by non-covalent bonds. During use, the complex migrates toward the metal surface in the oil via electrostatic attraction. Multiple covalent and non-covalent interactions between the catechol and amino groups on the oligodopamine reinforce the complex's adhesion to the metal surface, inhibiting the oil's antistatic agent from shedding from the metal surface as the oil scours.

[0009] Preferably, the preparation steps of the oligodopamine include the following: taking a mixed solvent, adjusting the pH and temperature, venting the gas with nitrogen, then adding a dopamine hydrochloride solution, adding an oxidation inhibitor, then venting with oxygen, then adding acetone, stirring and dispersing, centrifuging to obtain a precipitate, washing with water and then dispersing, then adding an alkyl isocyanate and a catalyst, reacting, then evaporating the solvent, washing, and drying to obtain the oligodopamine; The mixed solvent is obtained by mixing anhydrous ethanol and deionized water in a volume ratio of (1-1.5):1; The oxidation inhibitor is ascorbic acid; The pH and temperature are adjusted as follows: using ammonia water to adjust the pH to 7.8-8.3 and the temperature to 12.5-15°C; The specific steps of the oxygen treatment are: introducing oxygen at a rate of 0.085-0.1 L / min for 20-30 minutes; The structural formula of the alkyl isocyanate is: RN=C=O, where R is a saturated alkane group with 12 to 18 carbon atoms.

[0010] By adopting the above technical solution, specifically the solution oxidative polymerization reaction of dopamine, the oxygen infusion rate, reaction temperature, and reaction time are adjusted to prevent the dopamine polymerization reaction from proceeding too rapidly, ultimately yielding polydopamine molecules with a low degree of polymerization. By introducing an alkyl isocyanate with a long-chain alkyl group, and utilizing an alkyl chain structure similar to that of oil components, the oil solubility of the oligodopamine can be improved, reducing the migration resistance of the active component of the oil antistatic agent in the oil. Furthermore, the strong adsorption of the oligodopamine molecules to metal-based materials enhances the stability of the "double layer" structure formed by the active component of the oil antistatic agent.

[0011] Preferably, the activator is p-toluenesulfonic acid.

[0012] By adopting the above technical solution, p-toluenesulfonic acid is a strong organic acid that can provide protons H for the reaction of composite polyamine and oligodopamine. + environment, used to activate the aldehyde functional groups on the complex polyamine, promote the forward acetal reaction and the effective grafting of oligodopamine molecules on the complex polyamine.

[0013] Preferably, the mixed amine source is obtained by mixing pentamethylenediamine, p-phenylenediamine, hexamethylenediamine and (dimethylamino)acetaldehyde diformaldehyde in a mass ratio of (3-4): (2-2.5): (0.5-1): (0.1-0.2).

[0014] By adopting the above technical solution, (dimethylamino)acetaldehyde diformaldehyde is used as a mixed amine source raw material component, which can participate in the synthesis of composite polyamine during the reaction and introduce acetal groups into the composite polyamine cross-linked network; after the acetal group is deprotected, it can react with oligodopamine under the action of the subsequent activator p-toluenesulfonic acid, serving as an anchor point for the oligodopamine molecule on the composite polyamine cross-linked network, and enhancing the "claw"-like functional effect of the oligodopamine molecule on the composite polyamine.

[0015] Preferably, the deprotecting agent is one of zinc chloride and aluminum chloride.

[0016] By adopting the above technical solution, zinc chloride and aluminum chloride serve as strong Lewis acids and can coordinate with the oxygen atom of the acetal structure in (dimethylamino)acetaldehyde diformaldehyde, thereby activating the acetal structure. The use of the above deprotecting agent can avoid further oxidation of the aldehyde group and the occurrence of side reactions.

[0017] In the second aspect, the present application prepares an oil antistatic agent through the above preparation method.

[0018] In summary, this application has the following beneficial effects: 1. This application utilizes a composite polyamine combined with oligodopamine and then compounded with polysulfone to obtain an active antistatic agent component, enhancing the combined effect of polysulfone and polyamine through non-bonding interactions. The composite polyamine and oligodopamine, after being mixed, undergo an acetalization reaction under the action of an activator, forming a preliminary composite structure with the acetal site as the anchoring node. After further mixing with polysulfone, the catechol groups in the oligodopamine molecules provide hydrogen bond donors, forming an intermolecular hydrogen bond network with the sulfonic acid groups of the polysulfone, promoting the entanglement of the polysulfone within the cross-linked polyamine network, thereby obtaining a composite that can form a strong "double-layer" conductive structure.

[0019] 2. In this application, it is preferred to use oligodopamine modified with alkyl isocyanate to improve the affinity of oligodopamine in oil products, reduce the migration resistance of the active components of the antistatic agent in the oil products, and strengthen the formed "double electric layer" by taking advantage of the strong adsorption characteristics of the oligodopamine molecules themselves on the metal base.

[0020] 3. The antistatic agent treatment of the oil of the present application can enhance the firmness of the "double electric layer" and improve the electrical conductivity of the oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the initial conductivity of gasoline after using the antistatic agent of Examples 1-5 and Comparative Examples 1-2 of the present application.

[0022] Figure 2 The conductivity of gasoline changes over time after using the antistatic agent of Example 2 of the present application and Comparative Examples 1-2.

[0023] Figure 3 It is the electrical attenuation rate of gasoline after using the antistatic agent of Examples 1-5 and Comparative Examples 1-2 of the present application. DETAILED DESCRIPTION

[0024] Example 1 Take a 150ml flask, add 50ml of mixed solvent, then add ammonia water to adjust the pH to 7.8, adjust the temperature to 12.5℃, vent the gas with nitrogen, then quickly add 10ml of 0.1g / ml dopamine hydrochloride solution and 0.15g ascorbic acid, and introduce oxygen into the system at a rate of 0.085L / min, adjust the magnetic stirring speed to 100rpm, and stop introducing oxygen after 20min. Then add 30ml of acetone and continue stirring for 3min, then centrifuge to take the precipitate and wash it with water 3 times. After drying, disperse it with 30ml of ethylene diether, adjust the magnetic stirring speed to 75rpm, treat it for 2min, then add 3g of dodecyl isocyanate and 0.15g of catalyst dibutyltin dilaurate, adjust the temperature to 20℃ and continue the reaction for 2h, then use a rotary evaporator to evaporate the solvent, wash it twice with deionized water, filter the precipitate again, and dry it to obtain oligodopamine.

[0025] Take a 250ml flask, add 30ml of isopropanol and 20ml of toluene, mix well, then add 2.1g of epichlorohydrin, adjust the system temperature to 55°C, the magnetic stirring speed is 100rpm, and treat for 5min. Then add 5.5g of mixed amine source, increase the system temperature to 72°C, treat for 0.5h, then add 1.3g of sodium carbonate, continue stirring for 1.5h, then lower the system temperature to room temperature, add 0.2g of zinc chloride, adjust the magnetic stirring speed to 100rpm, continue to treat for 10min, then filter and take the liquid part, evaporate the solvent and wash it with petroleum ether twice, evaporate it again and grind it for 1min to obtain a composite polyamine.

[0026] Take 20g of composite polyamine and 5g of oligodopamine, mix them, add 35g of xylene, adjust the magnetic stirring speed to 150rpm, treat for 10min, then add 1g of p-toluenesulfonic acid, adjust the temperature to 45℃, treat for 3h, then add 15g of polysulfone, continue to treat for 1h to obtain an oil antistatic agent.

[0027] The mixed solvent was prepared by mixing anhydrous ethanol and deionized water in a volume ratio of 1:1. The mixed amine source was prepared by mixing pentamethylenediamine, p-phenylenediamine, hexamethylenediamine, and (dimethylamino)acetaldehyde diformaldehyde in a mass ratio of 3:2:0.5:0.1. Polysulfone (industrial grade, 99% purity) was provided by Hubei Shishun Biotechnology Co., Ltd.

[0028] Example 2 Take a 150ml flask, add 50ml of mixed solvent, then add ammonia water to adjust the pH to 8.0, adjust the temperature to 14°C, vent the gas with nitrogen, then quickly add 10ml of 0.1g / ml dopamine hydrochloride solution and 0.15g ascorbic acid, and introduce oxygen into the system at a rate of 0.09L / min, adjust the magnetic stirring speed to 100rpm, and stop introducing oxygen after 20min. Then add 30ml of acetone and continue stirring for 3min, then centrifuge to obtain the precipitate, wash it with water 3 times, dry it and disperse it with 30ml of ethylene diether, adjust the magnetic stirring speed to 75rpm, treat it for 2min, then add 3g of hexadecyl isocyanate and 0.15g of catalyst dibutyltin dilaurate, adjust the temperature to 25°C and continue the reaction for 3h, then use a rotary evaporator to evaporate the solvent, wash it twice with deionized water, filter the precipitate again, and dry it to obtain oligodopamine.

[0029] Take a 250ml flask, add 30ml of isopropanol and 20ml of toluene, mix well, then add 2.5g of epichlorohydrin, adjust the system temperature to 65°C, the magnetic stirring speed is 100rpm, and treat for 5min. Then add 5.5g of mixed amine source, increase the system temperature to 74°C, treat for 0.5h, then add 1.3g of sodium carbonate, continue stirring for 1.5h, then lower the system temperature to room temperature, add 0.2g of aluminum chloride, adjust the magnetic stirring speed to 100rpm, continue to treat for 10min, then filter and take the liquid part, evaporate the solvent and wash it with petroleum ether twice, evaporate it again and grind it for 1min to obtain a composite polyamine.

[0030] Take 24g of composite polyamine and 5g of oligodopamine, mix them, add 35g of xylene, adjust the magnetic stirring speed to 150rpm, treat for 10min, then add 1g of p-toluenesulfonic acid, adjust the temperature to 50℃, treat for 4h, then add 20g of polysulfone, continue to treat for 1h to obtain an oil antistatic agent.

[0031] The mixed solvent was prepared by mixing anhydrous ethanol and deionized water in a volume ratio of 1.5:1. The mixed amine source was prepared by mixing pentamethylenediamine, p-phenylenediamine, hexamethylenediamine, and (dimethylamino)acetaldehyde diformaldehyde in a mass ratio of 3.5:2.5:1:0.1. Polysulfone (industrial grade, 99% purity) was provided by Hubei Shishun Biotechnology Co., Ltd.

[0032] Example 3 Take a 150ml flask, add 50ml of mixed solvent, then add ammonia water to adjust the pH to 8.3, adjust the temperature to 15°C, vent the gas with nitrogen, then quickly add 10ml of 0.1g / ml dopamine hydrochloride solution and 0.15g ascorbic acid, and introduce oxygen into the system at a rate of 0.1L / min, adjust the magnetic stirring speed to 100rpm, and stop introducing oxygen after 30min. Then add 30ml of acetone and continue stirring for 5min, then centrifuge to obtain the precipitate, wash it with water 3 times, dry it and disperse it with 30ml of ethylene diether, adjust the magnetic stirring speed to 75rpm, treat it for 2min, then add 3g of octadecyl isocyanate and 0.15g of catalyst dibutyltin dilaurate, adjust the temperature to 25°C and continue the reaction for 3h, then use a rotary evaporator to evaporate the solvent, wash it with deionized water twice, filter the precipitate again, and dry it to obtain oligodopamine.

[0033] Take a 250ml flask, add 30ml of isopropanol and 20ml of toluene, mix well, then add 2.5g of epichlorohydrin, adjust the system temperature to 65°C, the magnetic stirring speed is 100rpm, and treat for 5min. Then add 5.5g of mixed amine source, increase the system temperature to 75°C, treat for 1h, then add 1.3g of sodium carbonate, continue stirring for 2h, then lower the system temperature to room temperature, add 0.2g of aluminum chloride, adjust the magnetic stirring speed to 100rpm, continue to treat for 30min, then filter and take the liquid part, evaporate the solvent and wash it with petroleum ether twice, evaporate it again and grind it for 2min to obtain a composite polyamine.

[0034] Take 25g of composite polyamine and 8g of oligodopamine, add 40g of xylene, adjust the magnetic stirring speed to 150rpm, treat for 10min, then add 2g of p-toluenesulfonic acid, adjust the temperature to 50℃, treat for 4h, then add 20g of polysulfone, continue to treat for 1h to obtain an oil antistatic agent.

[0035] The mixed solvent was prepared by mixing anhydrous ethanol and deionized water in a volume ratio of 1.5:1. The mixed amine source was prepared by mixing pentamethylenediamine, p-phenylenediamine, hexamethylenediamine, and (dimethylamino)acetaldehyde diformaldehyde in a mass ratio of 4:2.5:1:0.2. Polysulfone (industrial grade, 99% purity) was provided by Hubei Shishun Biotechnology Co., Ltd.

[0036] Example 4 The only difference between this embodiment and embodiment 1 is that the preparation steps of the oligodopamine are: Take a 150ml flask, add 50ml of mixed solvent, then add ammonia water to adjust the pH to 8.3, adjust the temperature to 15°C, vent the gas with nitrogen, then quickly add 10ml of 0.1g / ml dopamine hydrochloride solution and 0.15g ascorbic acid, and introduce oxygen into the system at a rate of 0.1L / min, adjust the magnetic stirring speed to 100rpm, and stop introducing oxygen after 30min. Then add 30ml of acetone and continue stirring for 5min, then centrifuge to obtain the precipitate, wash it with water 3 times, dry it and disperse it with 30ml of ethylene diether, adjust the magnetic stirring speed to 75rpm, treat it for 2min, then add 3g of octadecyl isocyanate and 0.15g of catalyst dibutyltin dilaurate, adjust the temperature to 25°C and continue the reaction for 3h, then use a rotary evaporator to evaporate the solvent, wash it with deionized water twice, filter the precipitate again, and dry it to obtain oligodopamine.

[0037] The remaining steps are the same as those in Example 1.

[0038] Example 5 The only difference between this embodiment and embodiment 1 is that the preparation steps of the oil antistatic agent are as follows: Take 22g of composite polyamine and 6g of oligodopamine, add 40g of xylene, adjust the magnetic stirring speed to 150rpm, treat for 10min, then add 2g of p-toluenesulfonic acid, adjust the temperature to 50℃, treat for 4h, then add 15g of polysulfone, continue to treat for 1h to obtain an oil antistatic agent.

[0039] The remaining steps are the same as those in Example 1.

[0040] Comparative Example 1 The only difference between this comparative example and Example 1 is that the preparation steps of the oil antistatic agent are as follows: Take 30g of composite polyamine and 1g of oligodopamine, add 35g of xylene, adjust the magnetic stirring speed to 150rpm, treat for 10min, then add 0.5g of p-toluenesulfonic acid, adjust the temperature to 50℃, treat for 4h, then add 15g of polysulfone, and continue to treat for 1h to obtain an oil antistatic agent.

[0041] The remaining steps are the same as those in Example 1.

[0042] Comparative Example 2 The difference between this comparative example and Example 1 is that the preparation steps of the oil antistatic agent are as follows: Take 45g of polysulfone, mix it with 40g of xylene, adjust the magnetic stirring speed to 200rpm, and treat it at a constant temperature of 50℃ for 4h to obtain the product.

[0043] Among them, polysulfone (industrial grade, purity 99%) was provided by Hubei Shishun Biotechnology Co., Ltd.

[0044] The remaining steps are the same as those in Example 1.

[0045] Performance testing Conductivity performance test According to the national standard GB / T6539-1997 test method, a 2L sealable iron storage tank was used, loaded with 1.5L of test sample (92-grade gasoline). The antistatic agents of Examples 1-5 and Comparative Examples 1-2 were added at a dosage of 6 PPM of effective antistatic agent to obtain test samples. The conductivity of the 92-grade gasoline after adding the antistatic agent was tested using a fuel conductivity meter (model: GM49-CM-08B). The test temperature was 25°C, the initial conductivity test time was 30 minutes, and the average of three groups was used as the final data for each group of test samples. The test results are shown below. Figure 1 As shown. Then, the conductivity of each group of test samples was periodically tested, and the changes in the conductivity of the test samples during the test period after adding the antistatic agent of each embodiment and comparative example oil were recorded. The test results of Example 2 and Comparative Example 1-2 are shown as follows. Figure 2 shown.

[0046] Environmental stability test To simulate the oil transportation environment, vibration tests were performed on the test samples of Examples 1-5 and Comparative Examples 1-2 after periodic testing. The conductivity (x1) of each test sample before the vibration test began was recorded. The iron storage tanks were then sealed and fixed on a test vibration table. The frequency was adjusted to 50 Hz and the amplitude was 10 mm. The vibration test was performed for 4 hours. After that, the test samples were allowed to stand for 2 hours and the conductivity (x2) of each group of test samples was remeasured.

[0047] According to the formula: A=[(x1-x2) / x1]×100% Calculate the attenuation rate (A) of the conductivity of each group of test samples after the test. The test results are as follows: Figure 3 shown.

[0048] Analyze Examples 1-5 and Comparative Examples 1-2 and combine Figure 1 It can be seen that the initial conductivity of the test sample after using the oil antistatic agent of the embodiment is significantly higher than that of the comparative example, and the effect of the single-component oil antistatic agent used in comparative example 2 is not as good as the combination of the multi-component oil antistatic agent of the embodiment; among all test groups, the test sample added with the oil antistatic agent of Example 2 has the highest initial conductivity.

[0049] Analyze Example 2 and Comparative Examples 1-2 and combine Figure 2It can be seen that the oil antistatic agent's effect rapidly increases from 0 to 5 days. This can be explained by the fact that during this period, the active components of the oil antistatic agent migrate to the tank surface and form a preliminary "double-layer" conductive structure, causing the test sample's conductivity to rapidly increase. This conductivity growth trend gradually slows after 5 days. The gasoline products in Comparative Examples 1 and 2 show a decrease in conductivity at 27 days and 20 days, respectively. In contrast, Example 2 shows no conductivity degradation throughout the entire test period, and the test sample's conductivity remains at 515 pS / m at 32 days, demonstrating that the oil antistatic agent in Example 2 has a longer-lasting effect.

[0050] Analyze Examples 1-5 and Comparative Examples 1-2 and combine Figure 3 It can be seen that after the vibration test, all samples tested in the Examples and Comparative Examples experienced conductivity decay. This is because the vibration test exacerbated the scouring of the tank wall by the oil in the tank and caused the active components of the oil antistatic agent attached to the tank surface to fall off from the tank surface, thereby disrupting the conductive path structure of the "double electric layer." Among all test groups, the oil antistatic agent in Comparative Example 2, which relies solely on the electrostatic attraction of a single component, formed an unstable electric layer structure on the tank surface and exhibited the most severe conductivity decay after the vibration test. Furthermore, the low proportion of oligodopamine raw material in Comparative Example 1 resulted in a less effective oil antistatic agent. In comparison, the oil antistatic agent in the Examples, due to the tight combination of polysulfone and polyamine molecules in the oil antistatic agent and the enhanced stability of the electric layer structure through the action of oligodopamine, had a higher resistance to vibration scouring of the test samples and maintained a low conductivity decay rate after the vibration test.

[0051] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for preparing an oil antistatic agent, characterized in that: The preparation method is obtained by mixing the following raw materials in parts by mass: 35-40 parts of xylene, 20-25 parts of composite polyamine, 15-20 parts of polysulfone, 5-8 parts of oligodopamine, and 1-2 parts of activator. The preparation steps include the following: Take the composite polyamine, mix it with oligodopamine, disperse it in xylene, add the activator, stir it, then add polysulfone and continue to process it to obtain; The preparation steps of the composite polyamine include the following: Take epichlorohydrin, disperse it, add a mixed amine source, heat it, then add sodium carbonate, continue stirring, then cool it down and add a deprotecting agent, filter the liquid part after treatment, evaporate it to dryness, wash it, dry it again and grind it to obtain a composite polyamine.

2. The method for preparing an oil antistatic agent according to claim 1, characterized in that: The preparation steps of the oligodopamine include the following steps: taking a mixed solvent, adjusting the pH and temperature, venting the gas with nitrogen, then adding a dopamine hydrochloride solution, adding an oxidation inhibitor, then treating with oxygen, then adding acetone, stirring and dispersing, centrifuging to obtain a precipitate, washing with water and then dispersing, then adding an alkyl isocyanate and a catalyst, reacting, then evaporating the solvent, washing, and drying to obtain the oligodopamine.

3. The method for preparing an antistatic agent for oil products according to claim 2, characterized in that: The mixed solvent is obtained by mixing anhydrous ethanol and deionized water in a volume ratio of (1-1.5):1; the oxidation inhibitor is ascorbic acid.

4. The method for preparing an oil antistatic agent according to claim 2, characterized in that: The pH and temperature are adjusted specifically as follows: using ammonia water to adjust the pH to 7.8-8.3, and adjusting the temperature to 12.5-15°C.

5. The method for preparing an antistatic agent for oil products according to claim 2, characterized in that: The specific steps of the oxygen treatment are: introducing oxygen at a rate of 0.085-0.1 L / min for 20-30 minutes.

6. The method for preparing an oil antistatic agent according to claim 2, characterized in that: The structural formula of the alkyl isocyanate is: RN=C=O, where R is a saturated alkane group with 12 to 18 carbon atoms.

7. The method for preparing an oil antistatic agent according to claim 1, characterized in that: The activating agent is p-toluenesulfonic acid.

8. The method for preparing an antistatic agent for oil products according to claim 1, characterized in that: The mixed amine source is obtained by mixing pentamethylenediamine, p-phenylenediamine, hexamethylenediamine and (dimethylamino)acetaldehyde diformaldehyde in a mass ratio of (3-4): (2-2.5): (0.5-1): (0.1-0.2).

9. The method for preparing an antistatic agent for oil products according to claim 1, characterized in that: The deprotecting agent is one of zinc chloride and aluminum chloride.

10. An oil antistatic agent prepared by the preparation method according to any one of claims 1 to 9.

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