An antistatic agent for oil products and its preparation method

Abstract

This application relates to the field of antistatic agent technology, specifically disclosing an oil-based antistatic agent and its preparation method. It is obtained by mixing and treating raw materials comprising the following parts by weight: xylene 35-40 parts, composite polyamine 20-25 parts, polysulfone 15-20 parts, oligomeric dopamine 5-8 parts, and activator 1-2 parts. The preparation steps include: taking composite polyamine, mixing it with oligomeric dopamine, dispersing it with xylene, adding the activator, stirring, then adding polysulfone, and continuing the treatment to obtain the final product. The preparation steps of the composite polyamine include: taking epichlorohydrin, dispersing it, adding a mixed amine source, heating the mixture, then adding sodium carbonate, continuing stirring, then cooling and adding a deprotecting agent, treating, filtering to obtain the liquid portion, evaporating to dryness, washing, drying again, and grinding to obtain the composite polyamine. The oil-based antistatic agent obtained by this application has strong antistatic ability and a long duration, and can form a more robust "electric double layer" structure.

Description

Technical Field

[0001] This application relates to the field of antistatic agents, and more specifically, to an oil-based antistatic agent and its preparation method. Background Technology

[0002] Antistatic agents are additives that reduce the accumulation of static electricity inside products and accelerate its dissipation. They effectively prevent static electricity hazards such as dust accumulation and spark discharge. During the extraction, refining, storage, transportation, and use of oil products, frequent friction and impact with pipelines, tanks, and pumping equipment can easily lead to the accumulation of static charge. When the oil surface potential reaches the critical breakdown value, the generated electric spark can ignite oil vapor and cause an explosion. Therefore, antistatic agents are usually added during oil transportation to increase the oil's conductivity and prevent the accumulation of static charge.

[0003] Oil antistatic agents are mainly compounded compositions of polyamine and polysulfone. The amine groups on the polyamine molecule can ionize to release cations (R-NH3). + Polyamines adsorb onto solid surfaces to form a tight layer, while the sulfone groups (-SO2-) on polysulfones possess strong polarity, stabilizing this tight layer and promoting the release of static charge within the oil. When used, the effective combination of these two components forms a relatively robust "electric double layer" structure on the solid surface. This structure allows for the construction of a conductive network within the oil phase, increasing the oil's conductivity and accelerating the leakage of internal charge, thereby reducing the risk of static charge accumulation. However, conventional methods primarily involve directly mixing or compounding polyamine and polysulfone molecules. Direct mixing makes it difficult for polyamine and polysulfone molecules to form an effective combination, while compounding reduces the functional groups of the antistatic agent, both of which are detrimental to the synergistic effect of polyamine and polysulfone. Furthermore, since the amount of antistatic agent added to the oil is only at the PPM level, the dispersion effect in the oil phase further reduces the combined effect of polyamine and polysulfone, making the resulting "electric double layer" more prone to detachment and disintegration.

[0004] Chinese patent application CN109355115A discloses a polysulfone-polyamine composite antistatic agent for oil products, its synthesis method, and its application method. The method involves preparing polyamine and polysulfone components separately, and then mixing the two components with substances such as dodecylbenzenesulfonic acid to obtain the antistatic agent. Through the synergistic effect of the various substances, the agent can improve the conductivity of oil products and enhance the antistatic effect.

[0005] While the aforementioned applications can improve the combined effect of polyamine and polysulfone, their effectiveness remains limited. Because polyamine and polysulfone molecules struggle to form a robust interaction structure, the resulting "electrical double layer" after adsorption onto the metal matrix is ​​still easily detached and disintegrated by oil movement, reducing the antistatic ability of the oil antistatic agent. Therefore, there is a need to find an oil antistatic agent that can strengthen the "electrical double layer" while simultaneously improving the oil's electrical conductivity. Summary of the Invention

[0006] To further strengthen the "double electric layer" and improve the antistatic ability of oil antistatic agents, this application provides an oil antistatic agent and its preparation method.

[0007] In a first aspect, this application provides a method for preparing an antistatic agent for oil products, which is obtained by mixing and treating raw materials comprising the following parts by weight: 35-40 parts xylene, 20-25 parts composite polyamine, 15-20 parts polysulfone, 5-8 parts oligomeric dopamine, and 1-2 parts activator; the preparation steps include the following:

[0008] Take a composite polyamine, mix it with oligomeric dopamine, disperse it with xylene, add an activator, stir and treat it, then add polysulfone and continue the treatment to obtain the product;

[0009] The preparation steps of the composite polyamine include the following:

[0010] 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. After treatment, filter the liquid part, evaporate it to dryness, wash it, dry it again, and grind it to obtain composite polyamine.

[0011] By employing the above technical solution, a tightly integrated composite structure can be obtained by mixing composite polyamine, oligomeric dopamine, and polysulfone. Specifically, after mixing the composite polyamine and oligomeric dopamine, an acetal reaction occurs under the action of an activator, forming a preliminary composite structure anchored at acetal sites. Further addition of polysulfone promotes the entanglement of polar polysulfone molecules on the composite polyamine through the "claw-like" structural effect of the phenolic hydroxyl groups enriched in oligomeric dopamine, ultimately resulting in a polyamine-polysulfone composite maintained by non-covalent bonds. In use, the composite migrates to the metal substrate surface in oil products through electrostatic attraction. The adhesion of the composite to the metal substrate surface is strengthened through the multiple covalent and non-covalent interactions between the catechol and amino groups on the oligomeric dopamine, inhibiting the detachment of the antistatic agent from the metal substrate surface during oil flushing.

[0012] Preferably, the preparation steps of the oligodopamine include the following: take a mixed solvent, adjust the pH and temperature, purge the air with nitrogen, then add hydrochloric acid dopamine solution, add an oxidation inhibitor, then treat with oxygen, then add acetone and stir to disperse, centrifuge to collect the precipitate, wash with water and disperse, then add alkyl isocyanate and catalyst, react, then evaporate the solvent, wash, and dry to obtain oligodopamine;

[0013] The mixed solvent is obtained by mixing anhydrous ethanol and deionized water in a volume ratio of (1-1.5):1;

[0014] The oxidation inhibitor is ascorbic acid;

[0015] The pH and temperature adjustments are specifically as follows: use ammonia to adjust the pH to 7.8-8.3 and adjust the temperature to 12.5-15℃;

[0016] The specific steps of the oxygen treatment are as follows: oxygen is introduced at a rate of 0.085-0.1 L / min for 20-30 min.

[0017] The structural formula of the alkyl isocyanate is:

[0018] RN=C=O, where R is a saturated alkane group with 12 to 18 carbon atoms.

[0019] By employing the above technical solution, this involves the solution oxidative polymerization reaction of dopamine. By adjusting conditions such as the oxygen introduction rate, reaction temperature, and time, the polymerization reaction of dopamine is prevented from proceeding too rapidly, ultimately yielding polydopamine molecules with a lower degree of polymerization. By introducing alkyl isocyanates with long-chain alkyl groups, and utilizing the alkyl chain structure similar to that of oil components, the oil solubility of oligomeric dopamine can be improved, reducing the migration resistance of the active component of the antistatic agent in the oil. Simultaneously, by leveraging the strong adsorption of the oligomeric dopamine molecule to metal-based materials, the stability of the "electric double layer" structure formed by the active component of the antistatic agent in the oil is enhanced.

[0020] Preferably, the activator is p-toluenesulfonic acid.

[0021] By adopting the above technical solution, p-toluenesulfonic acid, a strong organic acid, can provide protons (H) for the reaction of composite polyamines with oligomeric dopamine. + The environment is used to activate the aldehyde functional groups on the composite polyamine, promote the forward acetal reaction, and facilitate the effective grafting of oligomeric dopamine molecules onto the composite polyamine.

[0022] Preferably, the mixed amine source is obtained by mixing pentanediamine, p-phenylenediamine, hexanediamine and (dimethylamino)acetaldehyde diacetal in a mass ratio of (3-4):(2-2.5):(0.5-1):(0.1-0.2).

[0023] By adopting the above technical solution, (dimethylamino)acetaldehyde diacetal, as a component of the mixed amine source raw material, can participate in the synthesis of composite polyamine during the reaction and introduce acetal groups into the composite polyamine cross-linking network. After the acetal groups are deprotected, they can react with oligodopamine under the action of the subsequent activator p-toluenesulfonic acid, serving as anchor points for oligodopamine molecules on the composite polyamine cross-linking network and enhancing the "claw"-like functional effect of oligodopamine molecules on the composite polyamine.

[0024] Preferably, the deprotecting agent is one of zinc chloride and aluminum trichloride.

[0025] By adopting the above technical solution, zinc chloride and aluminum trichloride, as strong Lewis acids, can coordinate with the oxygen atom of the acetal structure in (dimethylamino)acetaldehyde diacetal, 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.

[0026] Secondly, this application obtains an antistatic agent for oil products through the above-mentioned preparation method.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. This application employs a combination of composite polyamine and oligomeric dopamine, followed by compounding with polysulfone to obtain an antistatic active component. The combination effect of polysulfone and polyamine is enhanced through non-bonding interaction. Specifically, after mixing the composite polyamine and oligomeric dopamine, an acetal reaction occurs under the action of an activator, forming a preliminary composite structure anchored at acetal sites. Further mixing with polysulfone utilizes the catechol groups in the oligomeric dopamine molecules to provide hydrogen bond donors. These donors form an intermolecular hydrogen bond network with the sulfonic acid groups of polysulfone, promoting the entanglement of polysulfone within the polyamine crosslinking network, thereby obtaining a composite that can form a robust conductive "double layer" structure.

[0029] 2. In this application, alkyl isocyanate modification is preferred to obtain oligodopamine, so as to improve the affinity of oligodopamine in oil, reduce the migration resistance of the active component of antistatic agent in oil, and strengthen the formed "electric double layer" by taking advantage of the strong adsorption of the oligodopamine molecule itself to the metal base.

[0030] 3. The antistatic agent for oil products described in this application can enhance the strength of the "double electric layer" and improve the conductivity of the oil products. Attached Figure Description

[0031] Figure 1 The initial conductivity of gasoline after using the antistatic agents of Examples 1-5 and Comparative Examples 1-2 of this application is given.

[0032] Figure 2This shows the change in the electrical conductivity of gasoline over time after using the antistatic agent in Example 2 and Comparative Examples 1-2 of this application.

[0033] Figure 3 The electrical decay rate of gasoline after using the antistatic agents of Examples 1-5 and Comparative Examples 1-2 of this application is measured. Detailed Implementation

[0034] Example 1

[0035] Take a 150ml flask, add 50ml of mixed solvent, then add ammonia to adjust the pH to 7.8, adjust the temperature to 12.5℃, purge the air with nitrogen, then quickly add 10ml of 0.1g / ml dopamine hydrochloride solution and 0.15g ascorbic acid, and purge the system with oxygen at a rate of 0.085L / min. Adjust the magnetic stirring speed to 100rpm and continue for 20min, then stop purging oxygen. Then add 30ml of acetone and continue stirring for 3min. Centrifuge, wash the precipitate three times with water, dry it, and disperse it with 30ml of diethylene ether. Adjust the magnetic stirring speed to 75rpm and treat for 2min. Then add 3g of dodecyl isocyanate and 0.15g of dibutyltin dilaurate catalyst, adjust the temperature to 20℃ and continue the reaction for 2h. Then evaporate the solvent using a rotary evaporator, wash twice with deionized water, filter again to collect the precipitate, and dry it to obtain oligomeric dopamine.

[0036] Take a 250ml flask, add 30ml isopropanol and 20ml toluene, mix well, then add 2.1g epichlorohydrin, adjust the system temperature to 55℃, and magnetically stir at 100rpm for 5min. Then add 5.5g mixed amine source, raise the system temperature to 72℃, and treat for 0.5h. Then add 1.3g sodium carbonate and continue stirring for 1.5h. After that, lower the system temperature to room temperature, add 0.2g zinc chloride, adjust the magnetic stirring speed to 100rpm, and continue treating for 10min. Then filter and collect the liquid part, evaporate the solvent, wash twice with petroleum ether, evaporate again, and grind for 1min to obtain composite polyamine.

[0037] Mix 20g of composite polyamine with 5g of oligomeric dopamine, then add 35g of xylene, adjust the magnetic stirring speed to 150rpm, and treat for 10min. Then add 1g of p-toluenesulfonic acid, adjust the temperature to 45℃, and treat for 3h. Then add 15g of polysulfone and continue to treat for 1h to obtain an oil antistatic agent.

[0038] The mixed solvent was obtained by mixing anhydrous ethanol and deionized water at a volume ratio of 1:1. The mixed amine source was obtained by mixing pentanediamine, p-phenylenediamine, hexamethylenediamine, and (dimethylamino)acetaldehyde dicarboxylate at a mass ratio of 3:2:0.5:0.1. Polysulfone (industrial grade, 99% purity) was provided by Hubei Shishun Biotechnology Co., Ltd.

[0039] Example 2

[0040] Take a 150ml flask, add 50ml of mixed solvent, then add ammonia to adjust the pH to 8.0, adjust the temperature to 14℃, purge the air with nitrogen, then quickly add 10ml of 0.1g / ml dopamine hydrochloride solution and 0.15g ascorbic acid, and purge the system with oxygen at a rate of 0.09L / min. Adjust the magnetic stirring speed to 100rpm and continue for 20min, then stop purging oxygen. Then add 30ml of acetone and continue stirring for 3min. Centrifuge, wash the precipitate three times with water, dry it, and disperse it with 30ml of diethylene ether. Adjust the magnetic stirring speed to 75rpm and treat for 2min. Then add 3g of hexadecyl isocyanate and 0.15g of dibutyltin dilaurate catalyst, adjust the temperature to 25℃ and continue the reaction for 3h. Then evaporate the solvent using a rotary evaporator, wash twice with deionized water, filter again to collect the precipitate, and dry it to obtain oligomeric dopamine.

[0041] Take a 250ml flask, add 30ml isopropanol and 20ml toluene, mix well, then add 2.5g epichlorohydrin, adjust the system temperature to 65℃, and magnetically stir at 100rpm for 5min. Then add 5.5g mixed amine source, raise the system temperature to 74℃, and treat for 0.5h. Then add 1.3g sodium carbonate and continue stirring for 1.5h. After that, lower the system temperature to room temperature, add 0.2g aluminum trichloride, adjust the magnetic stirring speed to 100rpm, and continue treating for 10min. Then filter and collect the liquid part, evaporate the solvent, wash twice with petroleum ether, evaporate again, and grind for 1min to obtain composite polyamine.

[0042] Mix 24g of composite polyamine with 5g of oligomeric dopamine, then add 35g of xylene, adjust the magnetic stirring speed to 150rpm, and treat for 10min. Then add 1g of p-toluenesulfonic acid, adjust the temperature to 50℃, and treat for 4h. Then add 20g of polysulfone and continue to treat for 1h to obtain an oil antistatic agent.

[0043] The mixed solvent was obtained by mixing anhydrous ethanol and deionized water at a volume ratio of 1.5:1. The mixed amine source was obtained by mixing pentanediamine, p-phenylenediamine, hexamethylenediamine, and (dimethylamino)acetaldehyde dicarboxylate at a mass ratio of 3.5:2.5:1:0.1. Polysulfone (industrial grade, 99% purity) was provided by Hubei Shishun Biotechnology Co., Ltd.

[0044] Example 3

[0045] Take a 150ml flask, add 50ml of mixed solvent, then add ammonia to adjust the pH to 8.3, adjust the temperature to 15℃, purge the air with nitrogen, then quickly add 10ml of 0.1g / ml dopamine hydrochloride solution and 0.15g ascorbic acid, and purge the system with oxygen at a rate of 0.1L / min, adjust the magnetic stirring speed to 100rpm, continue for 30min, then stop purging oxygen, then add 30ml of acetone, continue stirring for 5min, then centrifuge, take the precipitate, wash it with water 3 times, dry it, disperse it with 30ml of diethylene ether, adjust the magnetic stirring speed to 75rpm, treat for 2min, then add 3g of octadecyl isocyanate and 0.15g of dibutyltin dilaurate catalyst, adjust the temperature to 25℃ and continue the reaction for 3h, then use a rotary evaporator to evaporate the solvent, wash it with deionized water twice, filter again to take the precipitate, dry it to obtain oligomeric dopamine.

[0046] Take a 250ml flask, add 30ml isopropanol and 20ml toluene, mix well, then add 2.5g epichlorohydrin, adjust the system temperature to 65℃, and magnetically stir at 100rpm for 5min. Then add 5.5g mixed amine source, raise the system temperature to 75℃, and treat for 1h. Then add 1.3g sodium carbonate and continue stirring for 2h. After that, lower the system temperature to room temperature, add 0.2g aluminum trichloride, adjust the magnetic stirring speed to 100rpm, and continue treating for 30min. Then filter and collect the liquid part, evaporate the solvent, wash twice with petroleum ether, evaporate again, and grind for 2min to obtain composite polyamine.

[0047] Mix 25g of composite polyamine with 8g of oligomeric dopamine, then add 40g of xylene, adjust the magnetic stirring speed to 150rpm, and treat for 10min. Then add 2g of p-toluenesulfonic acid, adjust the temperature to 50℃, and treat for 4h. Then add 20g of polysulfone and continue to treat for 1h to obtain an oil antistatic agent.

[0048] The mixed solvent was obtained by mixing anhydrous ethanol and deionized water at a volume ratio of 1.5:1. The mixed amine source was obtained by mixing pentanediamine, p-phenylenediamine, hexanediamine, and (dimethylamino)acetaldehyde dicarboxylate at a mass ratio of 4:2.5:1:0.2. Polysulfone (industrial grade, 99% purity) was provided by Hubei Shishun Biotechnology Co., Ltd.

[0049] Example 4

[0050] The only difference between this embodiment and Embodiment 1 is that the preparation steps of the oligodopamine are as follows:

[0051] Take a 150ml flask, add 50ml of mixed solvent, then add ammonia to adjust the pH to 8.3, adjust the temperature to 15℃, purge the air with nitrogen, then quickly add 10ml of 0.1g / ml dopamine hydrochloride solution and 0.15g ascorbic acid, and purge the system with oxygen at a rate of 0.1L / min, adjust the magnetic stirring speed to 100rpm, continue for 30min, then stop purging oxygen, then add 30ml of acetone, continue stirring for 5min, then centrifuge, take the precipitate, wash it with water 3 times, dry it, disperse it with 30ml of diethylene ether, adjust the magnetic stirring speed to 75rpm, treat for 2min, then add 3g of octadecyl isocyanate and 0.15g of dibutyltin dilaurate catalyst, adjust the temperature to 25℃ and continue the reaction for 3h, then use a rotary evaporator to evaporate the solvent, wash it with deionized water twice, filter again to take the precipitate, dry it to obtain oligomeric dopamine.

[0052] The remaining steps are the same as in Example 1.

[0053] Example 5

[0054] The only difference between this embodiment and Embodiment 1 is that the preparation steps of the oil antistatic agent are as follows:

[0055] Mix 22g of composite polyamine with 6g of oligomeric dopamine, then add 40g of xylene, adjust the magnetic stirring speed to 150rpm, and treat for 10min. Then add 2g of p-toluenesulfonic acid, adjust the temperature to 50℃, and treat for 4h. Then add 15g of polysulfone and continue to treat for 1h to obtain an oil antistatic agent.

[0056] The remaining steps are the same as in Example 1.

[0057] Comparative Example 1

[0058] The only difference between this comparative example and Example 1 is that the preparation steps of the oil antistatic agent are as follows:

[0059] Mix 30g of composite polyamine with 1g of oligomeric dopamine, then 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.

[0060] The remaining steps are the same as in Example 1.

[0061] Comparative Example 2

[0062] The difference between this comparative example and Example 1 is that the preparation steps of the oil antistatic agent are as follows:

[0063] Take 45g of polysulfone, mix it with 40g of xylene, adjust the magnetic stirring speed to 200rpm, and treat it at 50℃ for 4h to obtain the final product.

[0064] The polysulfone (industrial grade, 99% purity) was provided by Hubei Shishun Biotechnology Co., Ltd.

[0065] The remaining steps are the same as in Example 1.

[0066] Performance testing

[0067] Conductivity performance test

[0068] Following the national standard GB / T6539-1997 test method, a 2L sealable iron storage tank was used, filled with 1.5L of test sample (92-octane gasoline). Antistatic agents from Examples 1-5 and Comparative Examples 1-2 were added at a concentration of 6 PPM to obtain the test sample. The conductivity of the 92-octane gasoline after adding the antistatic agent was tested using an oil conductivity meter (model: GM49-CM-08B). The test temperature was 25℃, and the initial conductivity test time was 30 minutes. Three sets of data were taken, and the average value was used as the final data for each set of test samples. The test results are as follows: Figure 1 As shown in the figure. Subsequently, the conductivity of each group of test samples was periodically tested, and the changes in conductivity of the test samples after adding the antistatic agents from the oils of each example and comparative example were recorded within the test period. The test results of Example 2 and Comparative Examples 1-2 are shown below. Figure 2 As shown.

[0069] Environmental stability test

[0070] To simulate the oil transportation environment, the test samples from Examples 1-5 and Comparative Examples 1-2 were subjected to vibration tests after periodic testing. The conductivity (x1) of each test sample before the vibration test was started was recorded. Then, the iron storage tank was sealed and fixed on the test vibration table. The frequency was adjusted to 50 Hz and the amplitude to 10 mm. The vibration test was carried out for 4 hours. After that, the samples were left to stand for 2 hours and the conductivity (x2) of each group of test samples was measured again.

[0071] According to the formula:

[0072] A = [(x1-x2) / x1] × 100%

[0073] The decay rate (A) of the conductivity of each group of test samples after the test was calculated, and the test results are as follows: Figure 3 As shown.

[0074] Analysis of Examples 1-5 and Comparative Examples 1-2 in conjunction with Figure 1It can be seen that the initial conductivity of the test samples after using the oil antistatic agent of the example was significantly higher than that of the comparative example. Moreover, the effect of the single-component oil antistatic agent used in the comparative example was not as good as that of the multi-component oil antistatic agent combination in the example. Among all test groups, the test samples with the oil antistatic agent of the example 2 had the highest initial conductivity.

[0075] Analysis of Example 2 and Comparative Examples 1-2 in combination Figure 2 It can be seen that 0-5 days is the rapid growth period of the antistatic agent's effect on the oil. This can be explained by the fact that during this period, the active components of the antistatic agent migrate to the surface of the tank and form a preliminary "double electric layer" conductive structure, causing the conductivity of the test sample to increase rapidly. This conductivity growth trend gradually slows down after 5 days. Among them, the gasoline products of Comparative Example 1 and Comparative Example 2 showed a decrease in conductivity at 27 days and 20 days, respectively. In contrast, the conductivity of Example 2 did not decrease throughout the entire test period, and the conductivity of the test sample could still be maintained at 515 pS / m at 32 days, indicating that the antistatic agent in Example 2 has a longer effect time.

[0076] Analysis of Examples 1-5 and Comparative Examples 1-2 in conjunction with Figure 3 It can be seen that after vibration testing, all samples from the embodiments and comparative examples exhibited conductivity decay. This is because vibration testing exacerbated the erosion of the tank wall by the oil in the storage tank, causing the active components of the oil antistatic agent adhering to the tank surface to detach from the tank surface, thereby disrupting the conductive channel structure of the "electric double layer". Among all test groups, the oil antistatic agent in Comparative Example 2 relied solely on the electrostatic attraction of a single component, resulting in an unstable electric layer structure on the tank surface, and the conductivity decay was the most severe after vibration testing. In Comparative Example 1, the proportion of oligomeric dopamine raw material was low, and the combined effect of the resulting oil antistatic agent was also poor. In contrast, because the polysulfone and polyamine molecules in the oil antistatic agent of the embodiments could combine tightly, and the stability of the electric layer structure was improved through the action of oligomeric dopamine, the resulting structure had a higher resistance to vibration erosion of the test samples, and the conductivity decay rate could be maintained at a low level after vibration testing.

[0077] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method for preparing an oil product antistatic agent, characterized by, By raw material mixing treatment including the following mass parts, xylene 35-40 parts, composite polyamine 20-25 parts, polysulfone 15-20 parts, oligomeric dopamine 5-8 parts, activator 1-2 parts, after preparation, the steps include the following: Take composite polyamine, mix with oligomeric dopamine, disperse with xylene, then add activator, stir and treat, then add polysulfone and continue to treat, and it is obtained; The preparation steps of the composite polyamine include the following: Take epichlorohydrin, disperse, add mixed amine source, heat treatment, then add sodium carbonate, continue to stir, then cool down and add deprotection agent, filter the liquid part after treatment, evaporate to dryness, wash, dry again, and grind to obtain composite polyamine; The activator is p-toluenesulfonic acid; The mixed amine source is pentanediamine, p-phenylenediamine, hexanediamine and (dimethylamino) acetaldehyde dimethyl acetal mixed in a mass ratio of (3-4):(2-2.5):(0.5-1):(0.1-0.2); The deprotection agent is one of zinc chloride and aluminum chloride.

2. The method for preparing an antistatic agent for oil products according to claim 1, characterized in that, The preparation steps of the oligomeric dopamine include the following: take mixed solvent, adjust pH and temperature, evacuate air with nitrogen, then add hydrochloric acid dopamine solution, add oxidation inhibitor, then treat with oxygen, then add acetone, stir and disperse, centrifuge to obtain precipitate, wash with water, then add alkyl isocyanate and catalyst, react, then evaporate the solvent, wash, dry to obtain oligomeric dopamine.

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 antistatic agent for oil products according to claim 2, characterized in that, The specific steps of adjusting pH and temperature are as follows: use ammonia to adjust the pH to 7.8-8.3 and the temperature to 12.5-15℃.

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

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

7. An oil antistatic agent prepared by the preparation method of any one of claims 1-6.

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