Anti-sticking agent, preparation method thereof and application of anti-sticking agent to vinyl polymerization reaction kettle

Abstract

The invention belongs to the field of high polymer application, and particularly relates to an anti-sticking agent, a preparation method of the anti-sticking agent and application of the anti-sticking agent to a vinyl polymerization reaction kettle. The anti-sticking agent comprises the following components in percentage by mass: 1.5-35% of a modified polyaniline solution, 0.5-8% of a film-forming agent and the balance of water. According to the anti-sticking agent for the kettle, the modified polyaniline is used as a basic raw material, the modified polyaniline keeps excellent electrical properties and has the characteristic of inhibiting polymerization of a contact surface, and then an environment-friendly aqueous solution is prepared by adding the film-forming agent and adjusting the pH value, so that an efficient anti-sticking effect can be realized.

Description

Technical Field

[0001] The invention belongs to the field of high polymer applications, and particularly relates to an anti-sticking kettle agent, a preparation method thereof, and application thereof in a vinyl polymerization reaction kettle. Background Art

[0002] Polyaniline is a widely and intensively studied polymer, and different industrial applications have been developed due to the fact that its electronic and optical properties can be modified by changing the number of protons, electrons, or both.

[0003] Polyaniline typically exists as a mixture, with the redox state of polyaniline typically represented by the value y. When 0 ≤ y ≤ 1, the oxidation state of the polymer increases as the value y decreases. When y = 1, it represents fully reduced polyaniline (also known as emeraldine); when y = 0, it represents fully oxidized polyaniline (also known as polyphenylenediamine); and when y = 0.5, it represents partially oxidized and partially reduced polyphenylenediamine (also known as emeraldine). Each oxidation state can exist in its base form or in its protonated form by treating the base with an acid.

[0004] During the vinyl polymer manufacturing process, polymer adhesion to surfaces such as reactor walls, agitators, and baffles (known in the industry as "stagnation") is a common problem in industrial production. This is particularly true in the production of polyvinyl chloride (PVC) resin, where vinyl chloride monomer polymerizes to form PVC. The presence of an initiator generates free radicals, which trigger polymerization of the vinyl chloride monomer, leading to continuous chain growth and precipitation of the PVC resin from the suspension. Since this polymerization process takes place within a polymerization reactor, polymer adhesion to the reactor walls is inevitable, increasing reactor cleaning time. More importantly, this stagnation carries over into the next polymerization cycle, increasing the number of "fish eyes" in the PVC resin and compromising resin quality. Furthermore, increased reactor cleaning time significantly hinders production.

[0005] To address these issues, China has introduced related anti-sticking coating technologies alongside polyvinyl chloride polymerization technology. The most common product is polyresorcinol, commonly known as "American Red." This solid product must be dissolved in sodium hydroxide solution before use. The resulting brown wastewater must be discharged after use, which is detrimental to environmental protection. Improved anti-sticking agents on the market are mixtures of phenolic resins. While effective, they require nitrogen protection (which can easily oxidize and reduce their effectiveness) and cannot be diluted with water, which increases costs. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an anti-sticking agent and a preparation method thereof and application in vinyl polymerization reactors.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] An anti-sticking agent comprises the following components by weight: 1.5%-35% of a modified polyaniline solution, 0.5%-8% of a film-forming agent and the balance of water.

[0009] Preferably, the following components are included by mass:

[0010] The modified polyaniline solution comprises modified polyaniline and a cosolvent; the mass content of the modified polyaniline solution is 10-40%.

[0011] The modified polyaniline is sulfonated polyaniline or deprotonated polypropylamine;

[0012] The sulfonated polyaniline is obtained by sulfonating polyaniline; the molecular weight of the polyaniline is 80,000-150,000, and y=0.35-0.7; the y value represents the degree of redox of the polyaniline;

[0013] The deprotonated polyaniline is obtained by dehydrogenating polyaniline; the molecular weight of the polyaniline is 80,000-150,000, y=0; and the y value represents the redox degree of the polyaniline.

[0014] The sulfonated polyaniline is prepared by the following steps: adding polyaniline to a sulfonating agent, controlling the reaction temperature at 10-35° C., and reacting for 2-5 hours; the sulfonating agent is fuming sulfuric acid, a 98% or higher sulfuric acid aqueous solution, or sulfur trioxide;

[0015] The deprotonated polyaniline is prepared by the following steps: immersing polyaniline in an alkaline solution, mixing for 40-60 minutes, filtering to obtain a precipitate, and washing to obtain the deprotonated polyaniline.

[0016] The cosolvent is one of dimethyl sulfoxide, N-methyl-2-pyrrolidone, tetrahydrofuran, formic acid, acetic acid, or dimethylformamide, or a mixture thereof; and the film-forming agent is polyvinyl alcohol.

[0017] The anti-sticking kettle agent has a viscosity of 3.0-12.0 mPa.s and a pH of ≥12.0.

[0018] The present invention also includes a method for preparing the anti-sticking agent, comprising the following steps: adding deionized water to a mixing container, starting stirring, adding a modified polyaniline solution and a film-forming agent; then adding an alkaline solution to adjust the pH to ≥12.0, and continuing to fully mix to obtain the anti-sticking agent finished product.

[0019] The present invention also includes an application of the anti-sticking agent in a vinyl polymerization reaction kettle.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The anti-sticking agent of this application utilizes modified polyaniline as its base material. This modified polyaniline maintains excellent electrical properties while inhibiting surface polymerization. By adding a film-forming agent and adjusting the pH, it is prepared into an environmentally friendly aqueous solution, achieving efficient anti-sticking. The modified polymer's unique electrochemical properties make it suitable for the polymerization of various vinyl monomers, including suspension polymerization, microsuspension polymerization, bulk polymerization, and solution polymerization. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention is further described in detail below with reference to the embodiments.

[0023] Example 1

[0024] Modified polyaniline is sulfonated modified polyaniline to prepare anti-sticking agent:

[0025] 1. Preparation of sulfonated modified polyaniline: polyaniline is added to a sulfonating agent, the reaction temperature is controlled at 10-35°C, and the reaction is carried out for 2-5 hours; the sulfonating agent is fuming sulfuric acid, a 98% or greater sulfuric acid aqueous solution, or sulfur trioxide; the molecular weight of the raw polyaniline is 80,000-150,000, and y = 0.35-0.7; the y value represents the degree of redox of the polyaniline; the raw polyaniline is not limited by the technical source and can be polyaniline obtained by a polymerization method well known to those skilled in the art, such as chemical oxidation, solution polymerization, emulsion polymerization, microemulsion polymerization, or electrochemical polymerization. This example uses commercially available polyaniline produced by emulsion polymerization with y = 0.35-0.7 and a degree of polymerization of 12,500 for illustration.

[0026] In this example, the sulfonating agent is fuming sulfuric acid. The following steps are used: In a glass stirred reaction flask, 15 g of polyaniline is dissolved in 400 ml of fuming sulfuric acid (H2SO4·SO3) at room temperature with constant stirring to carry out the sulfonation reaction. During the sulfonation, the color of the solution changes from dark purple to dark blue. The solution is slowly added to 2000 ml of methanol over 20 minutes to allow sedimentation. 1000 ml of less polar acetone is then added to increase precipitation. The solution is then filtered. The precipitate is washed with methanol in batches until the filtrate reaches a pH of 7. The precipitate is dried to obtain sulfonated polyaniline.

[0027] 2. Prepare a modified polyaniline solution; slowly add 23 g of sulfonated modified polyaniline to 100 g of a co-solvent, which is a mixture of 50 g each of N-methyl-2-pyrrolidone and formic acid; start stirring and mixing for 2.0 hours. When the solution completely turns dark blue, the mixing ends. This is the modified polyaniline solution used as the base material for the anti-sticking agent.

[0028] 3. Preparing an anti-sticking agent: In a stirring mixing container, add 2000 ml of deionized water, start stirring, add 30 g of the modified polyaniline solution, and then add 10 g of a film-forming agent (the film-forming agent is polyvinyl alcohol having an alcoholysis degree of 99.5-99.9 mole% and a degree of polymerization of 1350-1550, and the polyvinyl alcohol is prepared to have a solid content of 5.0%). Then, use 12 g of a 5% aqueous sodium hydroxide solution to adjust the pH to 12.3. Continue to mix thoroughly, and test the aqueous solution to obtain a viscosity of 4.3 mPa.s. This is to obtain the anti-sticking agent of the present invention.

[0029] Example 2

[0030] Modified polyaniline is sulfonated modified polyaniline to prepare anti-sticking agent:

[0031] 1. Preparation of sulfonated modified polyaniline: Purchase commercially available sulfonated modified basic raw material polyaniline, which is not limited by the technical source and can be polyaniline obtained by a polymerization method well known to those skilled in the art, such as chemical oxidation, solution polymerization, emulsion polymerization, microemulsion polymerization, or electrochemical polymerization. In this example, the polyaniline purchased is polyaniline with y = 0.35-0.7 produced by emulsion polymerization and a degree of polymerization of 12500.

[0032] The raw material for the sulfonation reaction is sulfur dioxide (SO₃). Commercially available polyaniline is exposed to SO₃ gas for a predetermined time and temperature. Vapor-phase sulfonation of polyaniline at high temperatures shortens the reaction time, while lower temperatures increase it. With an excess of SO₃ gas, vaporization can be completed in approximately 12 hours at room temperature.

[0033] This embodiment adopts the following method: 2g of the above-mentioned polyaniline was added to a hollow glass reactor, and 400ml of 23% fuming sulfuric acid was continuously introduced. The reaction temperature was controlled at 30-45°C, and the reaction was completed in 8 hours. The resulting compound is the sulfonated modified polyaniline of the present invention.

[0034] 2. Prepare an anti-sticking agent; slowly add 2.0 g of sulfonated modified polyaniline to 20 g of a co-solvent, wherein the co-solvent is N-methyl-2-pyrrolidone; start stirring and mixing for 2.0 hours. When the solution completely turns dark blue, the mixing ends. This is modified polyaniline as the base material of the anti-sticking agent.

[0035] 3. Preparation of an anti-sticking agent: In a 1000 ml stirring mixing container, add 200 ml of deionized water, start stirring, add 10 g of the modified polyaniline solution, and then add 3 g of a film-forming agent (the film-forming agent is polyvinyl alcohol having an alcoholysis degree of 99.5-99.9 mole % and a degree of polymerization of 1350-1550, and the polyvinyl alcohol is prepared to have a solid content of 5.0%). Then, adjust the pH to 12.5 with 7 g of an 8% aqueous ammonium hydroxide solution. Continue mixing thoroughly, and test the aqueous solution to obtain a viscosity of 3.7 mPa·s. This yields the anti-sticking agent of the present invention.

[0036] Example 3

[0037] Preparation of anti-sticking agent by deprotonation (dehydrogenation) modified polyaniline:

[0038] 1. Preparation of deprotonated polyaniline; the deprotonated polyaniline is obtained by dehydrogenation of polyaniline; the polyaniline has a molecular weight of 80,000-150,000, and y = 0; the y value represents the degree of redox of the polyaniline. The raw polyaniline, regardless of its source, can be obtained by polymerization methods well known to those skilled in the art, such as chemical oxidation, solution polymerization, emulsion polymerization, microemulsion polymerization, or electrochemical polymerization. This example uses commercially available emulsion-polymerized polyaniline with y = 0 and a degree of polymerization of 13,200 for illustration.

[0039] The following steps are specifically used: the raw material polyaniline is washed with 500 ml of distilled water to remove residual acid, and then 2000 ml of 1M ammonium hydroxide is added. The mixture is stirred for 45 minutes, and the precipitate is filtered and washed. The color of the polyaniline changes from dark blue-green to copper brown, thus obtaining the deprotonated polyaniline of the present invention.

[0040] 2. Prepare a modified polyaniline solution; slowly add 20 g of deprotonated polyaniline into 50 ml of tetrahydrofuran solution and start stirring. The solution turns dark blue and is completely dissolved to obtain a modified polyaniline solution.

[0041] 3. Preparing an anti-sticking agent: 20 g of the polyaniline solution was added to a 2000 ml beaker, 100 ml of distilled water was added, and stirring was started. 6 g of a film-forming agent (the film-forming agent was polyvinyl alcohol having an alcoholysis degree of 99.5-99.9 mole % and a degree of polymerization of 1350-1550, the polyvinyl alcohol being prepared to have a solid content of 5.0%) was added and stirred for 1 hour. The pH was then adjusted to 12.1 with 4.2 g of a 5% aqueous sodium hydroxide solution. The mixture was then thoroughly mixed. The viscosity of the aqueous solution was tested to be 4.2 mPa.s. This yielded the anti-sticking agent of the present invention.

[0042] Example 4

[0043] 1. Preparation of deprotonated polyaniline; Deprotonated (dehydrogenated) modified polyaniline uses the commercially available polyaniline with y=0 and a degree of polymerization of 13200 as a basic raw material.

[0044] Deprotonation (dehydrogenation) modification method: In a washable Büchner funnel, No. 41 filter paper is laid, 100 g of the above-mentioned polyaniline is added, and the mixture is washed with 500 ml of distilled water to remove residual acid. The powder on the filter paper is then poured into a 4-liter glass reaction flask with a stirrer, 2000 ml of 0.5 M potassium hydroxide is added, and stirring is initiated for 45 minutes. The solution is then filtered through a Büchner funnel (No. 41 filter paper), and the precipitate is washed with 800 ml of distilled water. The color of the polyaniline changes from dark blue-green to copper-brown, thereby obtaining the deprotonated polyaniline of the present invention.

[0045] 2. Prepare a modified polyaniline solution; slowly add 50 g of deprotonated polyaniline into 300 ml of acetic acid solution and start stirring until the solution turns dark blue and is completely dissolved.

[0046] 3. Preparation of an anti-sticking agent: 35 g of the polyaniline solution was added to a 2000 ml beaker, 100 ml of distilled water was added, stirring was started, and 8 g of a film-forming agent was added (the film-forming agent was polyvinyl alcohol having an alcoholysis degree of 99.5-99.9 mole % and a degree of polymerization of 1350-1550, the polyvinyl alcohol being prepared to have a solid content of 5.0%). The mixture was stirred for 1 hour, and then the pH was adjusted to 12.8 using 5.2 g of an 8% aqueous solution of ammonium hydroxide. The mixture was thoroughly mixed, and the viscosity of the aqueous solution was tested to be 6.1 mPa.s. The anti-sticking agent of the present invention was obtained.

[0047] The preparation method of the film-forming agent involved in this application is as follows: 95.0g of deionized water is added to a conventional glass bottle with a stirrer, and 5.0g of polyvinyl alcohol solid powder with a degree of alcoholysis of more than 99.5% and a degree of polymerization of 1350-1550 is evenly added under stirring conditions, soaked for 15 minutes, then heated to 90°C, continued to stir for 1 hour, and then cooled to below room temperature to prepare a 5.0% polyvinyl alcohol aqueous solution.

[0048] The antifouling agent of the present invention is a dark blue to black liquid of moderate viscosity, free of insoluble matter. It is unreactive with primary and secondary dispersants used in vinyl chloride suspension polymerization, anionic, cationic, nonionic, and cationic surfactants, vinyl chloride monomer or other vinyl monomers, polar or nonpolar solvents, alkalis, oils, or greases. This antifouling agent can be used to prevent fouling in reactors of any vinyl polymerization system, regardless of the limitations of vinyl chloride polymerization.

[0049] In order to verify the effect of the anti-sticking agent of the present invention, an application test was carried out on the surface of a laboratory-level reactor;

[0050] Test Example 1:

[0051] The anti-sticking agent of the present invention is used on the surface of a reactor; a 2-liter glass reactor is used to simulate acidic medium conditions in the presence of vinyl chloride to test the film-forming property of the material of the present invention.

[0052] Operating conditions and equipment:

[0053] (1) A 2-liter glass reactor with a jacket and stirring;

[0054] (2) Milton Roy Spectronic ZID spectrophotometer;

[0055] (3) 200 ml of the anti-sticking agent of the present invention;

[0056] (4) 0.1N hydrochloric acid (HCL) solution.

[0057] (5) Circulating hot water can be used for heating.

[0058] Materials and methods:

[0059] Completely simulating the suspension polymerization process of vinyl chloride, 15 ml of the present invention's anti-sticking agent (blue liquid) with a solid content of 1.5% is sprayed onto the inner surface of a 2-liter glass reactor. Let it stand for 5 minutes to form a film or coating of approximately 10 microns, and then flush it with water. Immediately inject 1.8 liters of distilled water into the reactor, heat it to 65°C, and adjust the pH to 2.0-3.0 (simulating the pH state of the polymerization system) with 0.1N hydrochloric acid solution. Turn on the reactor and stir for 15 minutes, then pour the distilled water into a transparent polyethylene container. Observe whether the distilled water changes color. This method tests the film-forming stability of the invention. If it turns blue, it means that the film has been washed away by water and the protective layer has fallen off; if it does not change color, the protective layer has not fallen off. A more accurate test is to use a spectrophotometer.

[0060] Three samples of the present invention with different solid contents were prepared. After testing using the above test method, 50 ml of the above distilled water was taken as a sample and analyzed using a Milton Roy Spectronic ZID spectrophotometer.

[0061] Prepare three standard samples with different solid contents, spray each sample three times, and retain 50 ml of the sample each time for spectrophotometric evaluation.

[0062] This example selected different concentrations of anti-sticking agent (prepared in Example 1) and compared them with blanks:

[0063] 1. For blank No. 1, prepare distilled water with 0.1N HCl to pH 2.2.

[0064] 2. Standard product No. 2 is a sample with a solid content of 1.5%.

[0065] 3. Standard product No. 3 is a sample with a solid content of 2.5%.

[0066] 4. Standard product No. 4 is a sample with a solid content of 5.0%.

[0067] Spectrophotometer test results:

[0068] The absorbance of the above samples was measured on a Milton Roy Spectronic ZID spectrophotometer after instrument calibration using blank No. 1.

[0069] 1. The absorbance of standard sample No. 2 is: 5.0525

[0070] 2. The absorbance of standard 3 sample is: 10.2362

[0071] 3. The absorbance of standard sample No. 4 is: 20.4702

[0072] The results are satisfactory and linearly consistent with the Beer-Lambert law (A=Kbc).

[0073] Using the above test procedure, samples with different solid contents were sprayed three times and then the absorbance of distilled water simulating polymerization was measured.

[0074] Absorbance:

[0075] Sample No. 2 tested three times: 2-ND 0.0

[0076] Sample 3 tested three times: 3-ND 0.0

[0077] Sample No. 4 tested three times: 4-ND 0.0

[0078] Similarly, the present application tested the absorbance of standard samples with different solid contents in Examples 2, 3, and 4, respectively, and they all satisfied the Beer-Lambert law (A=Kbc) linear consistency. Moreover, after being sprayed onto the inner wall of the reactor, the color deepened (indicating that the thickness of the film increased). After the distilled water simulating polymerization was poured into the anti-sticking agent coated with Examples 2, 3, and 4, the absorbance of the distilled water was measured to be 0.

[0079] Results and Discussion

[0080] As the number of spraying cycles increased from one to three, the coating on the reactor's inner wall deepened, becoming a deeper blue-green, indicating that the coating thickened with each spraying cycle. This explains why no detached coating was detected in the retained sample using the aforementioned absorbance method. All coating material adhered to the reactor's inner wall, as no coating material was detected in the retained water sample using the aforementioned quantitative spectrophotometric method. This is precisely the function of an anti-fouling agent: to form a stable coating on the glass or stainless steel surface, isolating the reactor from the polymerization center of the reaction system and protecting the reactor from scaling.

[0081] Test Example 2

[0082] The anti-sticking agent of the present invention is compared with commercial anti-sticking agents on the market at the laboratory level:

[0083] Buy NOXOL WSW anti-sticking agent on the market:

[0084] Appearance: light yellow transparent liquid;

[0085] Solid content: 5.5±0.5wt%;

[0086] pH: 12.0-13.0

[0087] NOXOL WSW samples with different solids contents (1.5%, 2.5%, and 5.0%) were prepared. Upon dilution with water, the pale yellow liquid turned blue, indicating that the product was water-insoluble. Therefore, a comparative test was conducted using the stock NOXOL WSW solution, using the same test method as in Test Example 1. After testing using the same method as in Test Example 1, 50 ml of the distilled water from the simulated polymerization was used as a sample.

[0088] Results and Discussion

[0089] When NOXOL WSW was used in the above test, the distilled water turned blue in the first test, and remained blue and darker in the second and third tests. This result indicates that only part of the NOXOL WSW was effective, and some of the coating fell off, indicating that NOXOL WSW was easily washed away and did not have a stable coating, indicating poor protection.

[0090] The above phenomenon is visible to the naked eye and does not require a spectrophotometer for analysis.

[0091] The results of the two test cases show that:

[0092] The anti-sticking agent of the present invention exhibits better film continuity, is smoother, and will not peel off. Theoretically, it can also exhibit the effect in a large stainless steel reactor.

[0093] Test Example 3

[0094] In order to evaluate the effect of using the present invention in industrial-grade production equipment, a 70M 3 The reactor polymerization was tested and the results are as follows:

[0095] The polymerization recipe is shown in Table 1 below.

[0096] Table 1

[0097] Deionized water 30.5 tons Vinyl chloride (VCM) monomer 25.2 tons 80moel%PVA 5.5kg 72mole% PVA 11.7kg Hydroxypropyl methylcellulose (HPMC) 1.0kg Bis(2-ethyl)hexyl peroxydicarbonate as initiator 10kg (dry basis)

[0098] Aggregation method:

[0099] At 70M 3 After the polymerization reactor completed the previous cycle, two polymerization reactors were selected for comparative testing of the anti-sticking agent prepared in Examples 1-4 of the present invention (all using samples with a solids content of 5.0%) and NOXOL WSW. First, the oxygen in the reactor was replaced with nitrogen to meet process requirements. Then, the anti-sticking agent was sprayed through a spray valve without draining. Agitation was initiated, and deionized water (cold and hot water to a system temperature of 58°C), vinyl chloride (VCM) monomer, dispersants 80 mol% PVA and 72 mol% PVA, hydroxypropyl methylcellulose (HPMC), and a buffer were sequentially added. Finally, an initiator was added to initiate polymerization to produce national standard Type V PVC. The polymerization temperature was set at 57°C, and the reaction time was 330 minutes. After a pressure drop of 0.5 MPa, a terminator was added to terminate the polymerization reaction, and the discharged material was stripped, centrifuged, and dried before being transferred to a finished product silo.

[0100] Comparative test conditions

[0101] The present invention and the anti-sticking agent NOXOL WSW were added to the production line's A (Example 1), B (NOXOL WSW), C (Example 2), D (Example 3), and E (Example 4) at a rate of 4.5 kg per batch. Comparative batches: 100 batches.

[0102] Industrial test results and discussion:

[0103] After 100 batches of comparisons between Reactor A, containing the present invention, and Reactor B, containing NOXOL WSW anti-fouling agent, the manhole was opened, the atmosphere purged with nitrogen and then air, and the reactor interior was visually inspected for fouling. The fouling was then removed and weighed, including both the internal contents and the contents filtered from the wet feed filter. It was found that the use of the present invention significantly reduced fouling in Reactor A. After 100 consecutive batches, the interior wall of Reactor A remained smooth, with no noticeable polymer adhesion, particularly at the gas-liquid interface.

[0104] The inner wall of kettle B in the same cycle is still smooth, but there is obvious sticking at the gas-liquid interface, the stirring surface, and the explosion-proof exhaust pipe. The data is summarized as follows:

[0105] Table 2

[0106]

[0107] In summary, the anti-sticking agent of the present invention has shown better film continuity, smoother film, and no peeling through laboratory-level tests and industrial production equipment tests. It can significantly reduce the accumulation of polymers, thereby extending the cleaning cycle, improving productivity, and reducing labor and maintenance costs.

[0108] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An anti-sticking agent, characterized in that The invention comprises the following components by weight: 1.5%-35% of modified polyaniline solution, 0.5%-8% of film-forming agent and the balance of water.

2. The anti-sticking agent according to claim 1, wherein The modified polyaniline solution comprises modified polyaniline and a cosolvent; the mass content of the modified polyaniline solution is 10-40%.

3. The anti-sticking kettle agent according to claim 2, wherein The modified polyaniline is sulfonated polyaniline or deprotonated polypropylamine; The sulfonated polyaniline is obtained by sulfonating polyaniline; the molecular weight of the polyaniline is 80,000-150,000, and y=0.35-0.7; the y value represents the degree of redox of the polyaniline; The deprotonated polyaniline is obtained by dehydrogenation of polyaniline; the molecular weight of the polyaniline is 80,000-150,000, and y=0; The y value represents the redox degree of polyaniline.

4. The anti-sticking agent according to claim 3, wherein The sulfonated polyaniline is prepared by the following steps: adding polyaniline to a sulfonating agent, controlling the reaction temperature at 10-35° C., and reacting for 2-5 hours; the sulfonating agent is fuming sulfuric acid, a 98% or higher sulfuric acid aqueous solution, or sulfur trioxide; The deprotonated polyaniline is prepared by the following steps: immersing polyaniline in an alkaline solution, mixing for 40-60 minutes, filtering to obtain a precipitate, and washing to obtain the deprotonated polyaniline.

5. The anti-sticking agent according to claim 2, characterized in that The cosolvent is one of dimethyl sulfoxide, N-methyl-2-pyrrolidone, tetrahydrofuran, formic acid, acetic acid, or dimethylformamide, or a mixture thereof.

6. The anti-sticking agent according to claim 1, characterized in that Viscosity: 3.0-12.0mPa.s, pH ≥ 12.

0.

7. The anti-sticking agent according to claim 1, characterized in that The solid content of the film-forming agent is 5% polyvinyl alcohol solution; the alcoholysis degree of the polyvinyl alcohol is 99.5-99.9 mole%, and the polymerization degree is 1350-1550.

8. A method for preparing the anti-sticking agent according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: adding deionized water into a mixing container, starting stirring, adding a modified polyaniline solution and a film-forming agent; then adding an alkaline solution to adjust the pH to ≥ 12.0, and continuing to fully mix to obtain the anti-sticking agent finished product.

9. Use of the anti-sticking agent according to any one of claims 1 to 7, characterized in that: Applied to vinyl polymerization reactor.

Images