Diesel oil pour point depressant based on multipolymer

Abstract

The invention provides a diesel oil pour point depressant based on a multipolymer, and belongs to the technical field of fuel additives. The diesel oil pour point depressant is prepared by the following steps: firstly, constructing a multipolymer which takes 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, acrylamide and anisd as unit bodies; on the basis, the pour point depressant is compounded with polyacrylate, methacrylic acid high-carbon alcohol ester, fatty alcohol-polyoxyethylene ether, vinyl benzoate, polyethylene glycol, cyclohexyl vinyl ether, monoisopropanolamine, glyceryl monostearate, N-hexadecyl methacrylamide and oleic acid polyoxyethylene ester to form the pour point depressant formula. Compared with the prior art, the average condensation point and the average cold filter plugging point of commercially available 0 # diesel oil and commercially available-10 # diesel oil respectively added with the diesel oil pour point depressant provided by the invention are lower, which shows that the diesel oil pour point depressant provided by the invention has better fluidity and pour point depressing effect than conventional pour point depressants. Moreover, black smoke during diesel combustion is obviously reduced, the combustion time is prolonged by 12%-15%, and a certain fuel-saving effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel additives, and particularly to a diesel pour point depressant based on a multi-polymer. Background Art

[0002] A diesel pour point depressant is an additive used to improve the low-temperature fluidity of diesel. Its main function is to ensure the smooth fluidity of diesel in low-temperature environments by reducing the pour point and cold filter plugging point of diesel. The pour point depressant changes the crystallization process of wax in diesel, prevents the adhesion between wax crystals, and makes the wax crystal particles finer, so that it can pass through the filter screen well.

[0003] The main components of diesel pour point depressants include the following: Alkyl naphthalene: As a common pour point depressant component, it can effectively reduce the pour point of diesel. Polymethacrylate: This component is also widely used in pour point depressants and can significantly reduce the pour point of diesel. Poly-α-olefin: Such as T803, is a new type of light-colored pour point depressant, which is made from soft wax cracked olefins as raw materials through refining and polymerization. Alkyl benzene sulfonate: This component can reduce the pour point of diesel and enhance its fluidity in low-temperature environments. Alkyl sulfonate: Similar to alkyl benzene sulfonate, alkyl sulfonate can also effectively reduce the pour point of diesel. Polyisobutene: This component is also used in pour point depressants and can improve the fluidity of diesel under low-temperature conditions. Methyl oleate, polyacrylic acid high-carbon steel alcohol ester, polyvinyl acetate, etc.: These components can effectively maintain the fluidity of diesel under low-temperature conditions and ensure the normal operation of diesel engines in cold environments.

[0004] The above components reduce the pour point of diesel through different chemical mechanisms, thus ensuring the smooth use of diesel in low-temperature environments. For example, alkyl naphthalene and polymethacrylate improve their low-temperature fluidity by reducing the pour point of diesel; while alkyl benzene sulfonate and alkyl sulfonate reduce the pour point temperature of diesel through chemical action to prevent it from solidifying at low temperatures. In the prior art, although conventional pour point depressants have a certain effect on reducing the pour point and cold filter plugging point of diesel, the effect still needs to be improved, and it is difficult for conventional pour point depressants to effectively improve the low-temperature flow performance of diesel. Summary of the Invention

[0005] The present invention aims to address the technical deficiencies of the prior art and provide a diesel pour point depressant based on a multi-polymer to solve the technical problem that the reduction effect of conventional pour point depressants on the cold condensation point and cold filter plugging point of diesel is relatively limited.

[0006] To achieve the above technical objectives, the present invention adopts the following technical solutions: A diesel pour point depressant based on a multi-polymer, comprising the following components in parts by weight: 15-18 parts of multi-polymer, 8-10 parts of polyacrylate, 3-5 parts of high-carbon alcohol methacrylate, 2-3 parts of fatty alcohol polyoxyethylene ether, 0.8-2 parts of vinyl benzoate, 1-1.5 parts of polyethylene glycol, 0.5-2 parts of cyclohexyl vinyl ether, 0.3-0.8 parts of monoisopropanolamine, 0.4-0.9 parts of glycerol monostearate, 1-1.5 parts of N-hexadecyl methacrylamide, 0.5-1.2 parts of polyoxyethylene oleate; the multi-polymer is prepared by the following method: Dissolve the formula amount of 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid in water, put them into a reactor, adjust the pH value of the system to 6.5 with a 20% sodium hydroxide solution by mass fraction, then add the formula amount of acrylamide and anisole, stir to dissolve and then heat up to 50°C: Add ammonium persulfate, sodium bisulfite and N,N-methylenebisacrylamide in sequence, and react for 5-10 minutes under continuous stirring to obtain a gel-like product; React statically in a 50°C constant temperature water bath for 2-3 hours, and keep the obtained product at 120°C for 1-1.5 hours to obtain the multi-polymer; In the formula amount, the mass ratio of 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, acrylamide, and anisole is 1:0.8-1.3:0.5-0.7:1.2-1.4.

[0007] Preferably, in the formula amount, the mass ratio of 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, acrylamide, and anisole is 1:1.1:0.6:1.3.

[0008] Preferably, the duration of static reaction in a 50°C constant temperature water bath is 2.5 hours, and the duration of keeping the obtained product at 120°C is 1.2 hours.

[0009] Preferably, the mass ratio of 2-acrylamide-2-methylpropanesulfonic acid, ammonium persulfate, sodium bisulfite, and N,N-methylenebisacrylamide is 1:0.1-0.3:0.2-0.3:0.1-0.18.

[0010] Preferably, the diesel pour point depressant further comprises 0.2-0.8 parts by weight of ethyl acetoacetate.

[0011] Preferably, the diesel pour point depressant further comprises 2-3.5 parts by weight of dibutyl phthalate.

[0012] Preferably, the temperature of the stirring and dissolving is 25-30°C, the rotation speed of the stirring and dissolving is 200-350 rpm, and the system is in an ultrasonic oscillation environment during the stirring and dissolving process.

[0013] Preferably, after adding ammonium persulfate, the temperature of the system is first raised to 75 - 80 °C and maintained for 20 - 30 min, then cooled to 50 °C, and then sodium bisulfite and N,N-methylenebisacrylamide are added successively.

[0014] Preferably, the diesel pour point depressant is composed of the following components in parts by weight: 16 parts of polyarylate, 9 parts of polyacrylate, 4 parts of higher alcohol methacrylate, 2.5 parts of fatty alcohol polyoxyethylene ether, 1.5 parts of vinyl benzoate, 1.3 parts of polyethylene glycol, 1.2 parts of cyclohexyl vinyl ether, 0.6 part of monoisopropanolamine, 0.5 part of glycerol monostearate, 1.1 parts of N-hexadecyl methacrylamide, 1.2 parts of polyoxyethylene oleate.

[0015] Preferably, the diesel pour point depressant is composed of the following components in parts by weight: 16 parts of polyarylate, 9 parts of polyacrylate, 4 parts of higher alcohol methacrylate, 2.5 parts of fatty alcohol polyoxyethylene ether, 1.5 parts of vinyl benzoate, 1.3 parts of polyethylene glycol, 1.2 parts of cyclohexyl vinyl ether, 0.6 part of monoisopropanolamine, 0.5 part of glycerol monostearate, 1.1 parts of N-hexadecyl methacrylamide, 1.2 parts of polyoxyethylene oleate, 0.7 part of ethyl acetoacetate, 3.1 parts of dibutyl phthalate.

[0016] The present invention provides a diesel pour point depressant based on polyarylate. The diesel pour point depressant first constructs a polyarylate with 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid, acrylamide, and anisole as monomers, and on this basis, is compounded with polyacrylate, higher alcohol methacrylate, fatty alcohol polyoxyethylene ether, vinyl benzoate, polyethylene glycol, cyclohexyl vinyl ether, monoisopropanolamine, glycerol monostearate, N-hexadecyl methacrylamide, and polyoxyethylene oleate to form a pour point depressant formulation. Compared with the prior art, the average cloud point and average cold filter plugging point are lower after adding the diesel pour point depressant of the present invention to commercially available 0# diesel and commercially available -10# diesel respectively, indicating that the diesel pour point depressant of the present invention has better fluidity and pour point depressing effect than conventional pour point depressants. Moreover, the present invention significantly reduces the black smoke during diesel combustion and extends the combustion time by 12% to 15%, having a certain fuel-saving effect. Detailed Description of the Invention

[0017] The following will describe the specific embodiments of the present invention in detail. In order to avoid excessive unnecessary details, the well-known structures or functions will not be described in detail in the following embodiments. The approximate language used in the following embodiments can be used for quantitative expression, indicating that a certain change in quantity is allowed without changing the basic function. Unless otherwise defined, the technical and scientific terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0018] Example 1 A diesel pour point depressant based on a multi-polymer, characterized in that it comprises the following components in parts by weight: 15 parts of multi-polymer, 8 parts of polyacrylate, 3 parts of higher alcohol methacrylate, 2 parts of fatty alcohol polyoxyethylene ether, 0.8 part of vinyl benzoate, 1 part of polyethylene glycol, 0.5 part of cyclohexyl vinyl ether, 0.3 part of mono-isopropanolamine, 0.4 part of glycerol monostearate, 1 part of N-hexadecyl methacrylamide, 0.5 part of polyoxyethylene oleate; the multi-polymer is prepared by the following method: dissolving the formulated amounts of 2-acrylamido-2-methylpropanesulfonic acid and acrylic acid in water, putting them into a reactor, adjusting the pH value of the system to 6.5 with a 20% sodium hydroxide solution by mass fraction, then adding the formulated amounts of acrylamide and anisole, stirring and dissolving, and then heating to 50 °C: successively adding ammonium persulfate, sodium bisulfite and N,N'-methylenebisacrylamide, reacting for 5 min under continuous stirring to obtain a gel-like product; standing and reacting in a 50 °C constant temperature water bath for 2 h, and keeping the obtained product at 120 °C for 1 h to obtain the multi-polymer; in the formulated amounts, the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid, acrylamide and anisole is 1:0.8:0.5:1.2.

[0019] Example 2 A diesel pour point depressant based on a multi-polymer, characterized in that it comprises the following components in parts by weight: 18 parts of multi-polymer, 10 parts of polyacrylate, 5 parts of higher alcohol methacrylate, 3 parts of fatty alcohol polyoxyethylene ether, 2 parts of vinyl benzoate, 1.5 parts of polyethylene glycol, 2 parts of cyclohexyl vinyl ether, 0.8 part of mono-isopropanolamine, 0.9 part of glycerol monostearate, 1.5 parts of N-hexadecyl methacrylamide, 1.2 parts of polyoxyethylene oleate; the multi-polymer is prepared by the following method: dissolving the formulated amounts of 2-acrylamido-2-methylpropanesulfonic acid and acrylic acid in water, putting them into a reactor, adjusting the pH value of the system to 6.5 with a 20% sodium hydroxide solution by mass fraction, then adding the formulated amounts of acrylamide and anisole, stirring and dissolving, and then heating to 50 °C: successively adding ammonium persulfate, sodium bisulfite and N,N'-methylenebisacrylamide, reacting for 10 min under continuous stirring to obtain a gel-like product; standing and reacting in a 50 °C constant temperature water bath for 3 h, and keeping the obtained product at 120 °C for 1.5 h to obtain the multi-polymer; in the formulated amounts, the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid, acrylamide and anisole is 1:1.3:0.7:1.4.

[0020] Example 3 A diesel fuel flow improver based on a multi-component polymer, characterized in that it comprises the following components in parts by weight: 17 parts of multi-component polymer, 9 parts of polyacrylate, 4 parts of high-carbon alcohol methacrylate, 2.5 parts of fatty alcohol polyoxyethylene ether, 1.4 parts of vinyl benzoate, 1.2 parts of polyethylene glycol, 1.3 parts of cyclohexyl vinyl ether, 0.6 part of mono-isopropanolamine, 0.7 part of glycerol monostearate, 1.2 parts of N-hexadecyl methacrylamide, 0.8 part of polyoxyethylene oleate; the multi-component polymer is prepared by the following method: dissolving the formulated amounts of 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid in water, putting them into a reactor, adjusting the pH value of the system to 6.5 with a 20% by mass sodium hydroxide solution, then adding the formulated amounts of acrylamide and anisole, stirring and dissolving, and then heating to 50°C: successively adding ammonium persulfate, sodium bisulfite and N,N-methylenebisacrylamide, reacting for 8 min with continuous stirring to obtain a gel-like product; standing and reacting in a 50°C constant temperature water bath for 2.5 h, and maintaining the obtained product at 120°C for 1.2 h to obtain the multi-component polymer; in the formulated amounts, the mass ratio of 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, acrylamide and anisole is 1:1:0.6:1.3.

[0021] Example 4 A diesel pour point depressant based on a multi-polymer, characterized in that it comprises the following components in parts by weight: 17 parts of multi-polymer, 9 parts of polyacrylate, 4 parts of higher alcohol methacrylate, 2.5 parts of fatty alcohol polyoxyethylene ether, 1.4 parts of vinyl benzoate, 1.2 parts of polyethylene glycol, 1.3 parts of cyclohexyl vinyl ether, 0.6 part of mono-isopropanolamine, 0.7 part of glycerol monostearate, 1.2 parts of N-hexadecyl methacrylamide, 0.8 part of polyoxyethylene oleate, 0.7 part of ethyl acetoacetate, 3.1 parts of dibutyl phthalate; the multi-polymer is prepared by the following method: Dissolve the formulated amounts of 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid in water, put them into a reactor, adjust the pH value of the system to 6.5 with a 20% sodium hydroxide solution by mass fraction, then add the formulated amounts of acrylamide and anisole, stir to dissolve and then heat up to 50 °C: Add ammonium persulfate, sodium bisulfite and N,N'-methylenebisacrylamide in sequence, and react for 8 min under continuous stirring to obtain a gel-like product; React statically in a 50 °C constant temperature water bath for 2.5 h, and keep the obtained product at 120 °C for 1.2 h to obtain the multi-polymer; In the formulated amounts, the mass ratio of 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, acrylamide and anisole is 1:1:0.6:1.3. The duration of static reaction in a 50 °C constant temperature water bath is 2.5 h, and the duration of keeping the obtained product at 120 °C is 1.2 h. The mass ratio of 2-acrylamide-2-methylpropanesulfonic acid, ammonium persulfate, sodium bisulfite and N,N'-methylenebisacrylamide is 1:0.2:0.5:0.14. The temperature of the stirring and dissolving is 28 °C, the rotation speed of the stirring and dissolving is 270 rpm, and the system is in an ultrasonic oscillation environment during the stirring and dissolving process. After adding ammonium persulfate, first raise the temperature of the system to 77 °C and keep it for 25 min, then cool it down to 50 °C, and then add sodium bisulfite and N,N'-methylenebisacrylamide in sequence.

[0022] The performance tests of the diesel pour point depressant of the present invention obtained in the above Example 4 and the domestic diesel pour point depressant of the prior art are as follows: (1) The method for testing the pour point is based on "GB510-83 Determination of Pour Point of Petroleum Products".

[0023] (2) The method for testing the closed cup flash point is based on "GB / T261-2008 Petroleum Products - Determination of Flash Point (Closed Cup Method)".

[0024] (3) The cold filter plugging point is determined according to the national standard "GB252—87".

[0025] (4) The fuel saving and smoke elimination are carried out by the comparison method.

[0026] The data comparison of the average pour points of the diesel pour point depressant of the present invention and the domestic diesel pour point depressant of the prior art is shown in Table 1.

[0027] Table 1 As can be seen from Table 1, the pour points of the commercially available 0# diesel without pour point depressant, the average pour points after adding 2000 ppm of the prior art domestic pour point depressant, and the average pour points after adding 2000 ppm of the diesel pour point depressant of the present invention are -9°C, -22°C to -20°C, and -31.5°C respectively. The average pour point of the commercially available 0# diesel after adding 2000 ppm of the diesel pour point depressant of the present invention is 9.5°C to 11.5°C lower than the average pour point after adding 2000 ppm of the prior art domestic pour point depressant; the pour points of the commercially available -10# diesel without pour point depressant, the average pour points after adding 2000 ppm of the prior art domestic pour point depressant, and the average pour points after adding 2000 ppm of the diesel pour point depressant of the present invention are -12.5°C, -25.5°C to -24°C, and -34.5°C respectively. The average pour point of the commercially available -10# diesel after adding 2000 ppm of the diesel pour point depressant of the present invention is 9°C to 10.5°C lower than the average pour point after adding 2000 ppm of the prior art domestic pour point depressant; the average pour points of the commercially available 0# diesel and the commercially available -10# diesel after adding the diesel pour point depressant of the present invention are lower than the average pour points after adding the prior art domestic pour point depressant respectively, indicating that the diesel pour point depressant of the present invention has better fluidity and pour point depressing effect than the prior art domestic pour point depressant.

[0028] The data comparison of the average cold filter plugging points between the diesel pour point depressant of the present invention and the prior art domestic diesel pour point depressant is shown in Table 2.

[0029] Table 2 As can be seen from Table 2, the cold filter plugging points of commercially available 0# diesel without adding a pour point depressant, the average cold filter plugging points after adding 2000 ppm of domestic pour point depressants in the prior art, and the average cold filter plugging points after adding 2000 ppm of the diesel pour point depressant of the present invention are -3°C, -9°C to -8°C, and -16.5°C respectively. The average cold filter plugging point after adding 2000 ppm of the diesel pour point depressant of the present invention to commercially available 0# diesel is 7.5°C to 8.5°C lower than the average cold filter plugging point after adding 2000 ppm of domestic pour point depressants in the prior art; the cold filter plugging points of commercially available -10# diesel without adding a pour point depressant, the average cold filter plugging points after adding 2000 ppm of domestic pour point depressants in the prior art, and the average cold filter plugging points after adding 2000 ppm of the diesel pour point depressant of the present invention are -6°C, -13°C to -11.5°C, and -21.5°C respectively. The average cold filter plugging point after adding 2000 ppm of the diesel pour point depressant of the present invention to commercially available -10# diesel is 8.5°C to 10°C lower than the average cold filter plugging point after adding 2000 ppm of domestic pour point depressants in the prior art; the average cold filter plugging point after adding the diesel pour point depressant of the present invention to commercially available 0# diesel or commercially available -10# diesel is lower than the average cold filter plugging point after adding domestic pour point depressants in the prior art to commercially available 0# diesel or commercially available -10# diesel, indicating that the diesel pour point depressant of the present invention has better fluidity and pour point depression effect than domestic pour point depressants in the prior art.

[0030] The data comparison of the average flash points of the diesel pour point depressant of the present invention and domestic diesel pour point depressants in the prior art is shown in Table 3.

[0031] Table 3 As can be seen from Table 3, the flash points of commercially available 0# diesel without adding a pour point depressant, the average flash points after adding 2000 ppm of domestic pour point depressants in the prior art, and the average flash points after adding 2000 ppm of the diesel pour point depressant of the present invention are 66°C, 64.5°C to 65.5°C, and 64°C respectively; the flash points of commercially available -10# diesel without adding a pour point depressant, the average flash points after adding 2000 ppm of domestic pour point depressants in the prior art, and the average flash points after adding 2000 ppm of the diesel pour point depressant of the present invention are 67°C, 64°C to 65°C, and 65.5°C respectively; the flash points after adding the diesel pour point depressant of the present invention to commercially available 0# diesel or commercially available -10# diesel are not much different from the flash points after adding domestic pour point depressants in the prior art to commercially available 0# diesel or commercially available -10# diesel, and the flash points of commercially available 0# diesel and commercially available -10# diesel, indicating that adding the diesel pour point depressant of the present invention to commercially available 0# diesel or commercially available -10# diesel has little effect on the flash points of 0# diesel or commercially available -10# diesel.

[0032] After testing the diesel pour point depressant obtained by the present invention and the domestic diesel pour point depressant in the prior art under the same conditions, it is found that when the diesel pour point depressant of the present invention is added to commercially available 0# diesel or commercially available -10# diesel, the black smoke during combustion is significantly less than that when the domestic pour point depressant in the prior art is added to commercially available 0# diesel or commercially available -10# diesel, and the combustion time is extended by 12% to 15%. This shows that when the diesel pour point depressant of the present invention is added to commercially available 0# diesel or commercially available -10# diesel, the combustion is more complete and the fuel-saving effect is better.

[0033] The embodiments of the present invention have been described in detail above, but the above content is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the scope of the application of the present invention shall be included within the protection scope of the present invention.

Claims

1. A diesel fuel flow improver based on a multi-polymer, characterized in that, It comprises the following components in parts by weight: 15 - 18 parts of a poly - polymer, 8 - 10 parts of polyacrylate, 3 - 5 parts of higher - carbon - alcohol methacrylate, 2 - 3 parts of fatty alcohol polyoxyethylene ether, 0.8 - 2 parts of vinyl benzoate, 1 - 1.5 parts of polyethylene glycol, 0.5 - 2 parts of cyclohexyl vinyl ether, 0.3 - 0.8 parts of monoisopropanolamine, 0.4 - 0.9 parts of glycerol monostearate, 1 - 1.5 parts of N - hexadecyl methacrylamide, 0.5 - 1.2 parts of polyoxyethylene oleate; The poly - polymer is prepared by the following method: Dissolve the formula amount of 2 - acrylamide - 2 - methylpropanesulfonic acid and acrylic acid in water, put them into a reactor, adjust the pH value of the system to 6.5 with 20% sodium hydroxide solution by mass fraction, then add the formula amount of acrylamide and anisole, stir to dissolve and then heat up to 50 °C: Add ammonium persulfate, sodium bisulfite and N,N - methylenebisacrylamide in sequence, and react for 5 - 10 min under continuous stirring to obtain a gel - like product; React statically in a 50 °C constant - temperature water bath for 2 - 3 h, keep the obtained product at 120 °C for 1 - 1.5 h to obtain the poly - polymer; In the formula amount, the mass ratio of 2 - acrylamide - 2 - methylpropanesulfonic acid, acrylic acid, acrylamide and anisole is 1:0.8 - 1.3:0.5 - 0.7:1.2 - 1.

4.

2. The diesel fuel pour point depressant based on a multi-polymer according to claim 1, wherein, In the formula amount, the mass ratio of 2 - acrylamide - 2 - methylpropanesulfonic acid, acrylic acid, acrylamide and anisole is 1:1.1:0.6:1.

3.

3. The diesel pour point depressant based on a multi-polymer according to claim 1, characterized in that, The duration of static reaction in a 50 °C constant - temperature water bath is 2.5 h, and the duration of keeping the obtained product at 120 °C is 1.2 h.

4. A pour point depressant for diesel based on a multi-polymer according to claim 1, characterized in that, The mass ratio of 2 - acrylamide - 2 - methylpropanesulfonic acid, ammonium sulfate, sodium bisulfite and N,N - methylenebisacrylamide is 1:0.1 - 0.3:0.2 - 0.3:0.1 - 0.

18.

5. The diesel pour point depressant based on a multi-polymer according to claim 1, characterized in that, This diesel pour point depressant also includes 0.2 - 0.8 parts by weight of ethyl acetoacetate.

6. The diesel pour point depressant based on a multi-polymer according to claim 1, characterized in that, This diesel pour point depressant also includes 2 - 3.5 parts by weight of dibutyl phthalate.

7. The diesel fuel flow improver based on a multi-polymer according to claim 1, characterized in that, The temperature of the stirring and dissolving is 25 - 30 °C, the rotation speed of the stirring and dissolving is 200 - 350 rpm, and the system is in an ultrasonic oscillation environment during the stirring and dissolving process.

8. A pour point depressant for diesel based on a multi-polymer according to claim 1, characterized in that, After adding ammonium persulfate, first raise the system temperature to 75 - 80 °C, keep it for 20 - 30 min, then cool it down to 50 °C, and then add sodium bisulfite and N,N - methylenebisacrylamide in sequence.

9. A diesel fuel flow improver based on a multi-polymer according to claim 1, characterized in that, This diesel pour point depressant is composed of the following components in parts by weight: 16 parts of a poly - polymer, 9 parts of polyacrylate, 4 parts of higher - carbon - alcohol methacrylate, 2.5 parts of fatty alcohol polyoxyethylene ether, 1.5 parts of vinyl benzoate, 1.3 parts of polyethylene glycol, 1.2 parts of cyclohexyl vinyl ether, 0.6 parts of monoisopropanolamine, 0.5 parts of glycerol monostearate, 1.1 parts of N - hexadecyl methacrylamide, 1.2 parts of polyoxyethylene oleate.

10. A diesel fuel flow improver based on a multi-polymer according to claim 1, characterized in that, This diesel fuel pour point depressant is composed of the following components in parts by weight: 16 parts of polyol polymer, 9 parts of polyacrylate, 4 parts of higher alcohol methacrylate, 2.5 parts of fatty alcohol polyoxyethylene ether, 1.5 parts of vinyl benzoate, 1.3 parts of polyethylene glycol, 1.2 parts of cyclohexyl vinyl ether, 0.6 part of mono-isopropanolamine, 0.5 part of glycerol monostearate, 1.1 parts of N-hexadecyl methacrylamide, 1.2 parts of polyoxyethylene oleate, 0.7 part of ethyl acetoacetate, and 3.1 parts of dibutyl phthalate.

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