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CN-122012154-A - Compound pour point depressant and manufacturing method thereof

CN122012154ACN 122012154 ACN122012154 ACN 122012154ACN-122012154-A

Abstract

The invention relates to a compound pour point depressant and a preparation method thereof, wherein the compound pour point depressant comprises an ethylene-vinyl acetate copolymer serving as a main pour point depressant, a polymethacrylate pour point depressant, a synergist, a dispersing agent and an antioxidant, wherein the ethylene-vinyl acetate copolymer is a maleic acid graft copolymer, and the mass ratio of the ethylene-vinyl acetate copolymer to the polymethacrylate pour point depressant is (1-3): 1.

Inventors

  • WANG ZHEN
  • XIAO QI
  • LI KE
  • WU MAN

Assignees

  • 新乡市瑞丰新材料股份有限公司

Dates

Publication Date
20260512
Application Date
20251223

Claims (10)

  1. 1. The compound pour point depressant comprises an ethylene-vinyl acetate copolymer as a main pour point depressant, a polymethacrylate pour point depressant, a synergist, a dispersing agent and an antioxidant, wherein the ethylene-vinyl acetate copolymer is a maleic acid graft copolymer, and the mass ratio of the ethylene-vinyl acetate copolymer to the polymethacrylate pour point depressant is (1-3): 1.
  2. 2. The compound pour point depressant of claim 1, wherein the synergist is polyisobutylene succinic anhydride.
  3. 3. The compound pour point depressant according to claim 1 or 2, wherein the ethylene-vinyl acetate copolymer is 20 to 80 parts by mass, the polymethacrylate pour point depressant is 20 to 80 parts by mass, the synergist is 10 to 40 parts by mass, the dispersant is 10 to 40 parts by mass, and the antioxidant is 1 to 20 parts by mass.
  4. 4. The compound pour point depressant of claim 1 or 2, wherein the dispersant is sorbitan monooleate and the antioxidant is 2, 6-di-tert-butyl-p-cresol.
  5. 5. The compound pour point depressant of claim 1 or 2, wherein the grafting ratio of maleic anhydride of the ethylene-vinyl acetate copolymer is 8% -10%.
  6. 6. The compound pour point depressant of claim 1 or 2, wherein the weight average molecular weight of the ethylene-vinyl acetate copolymer is 6 to 8 tens of thousands.
  7. 7. A method for manufacturing a compound pour point depressant, wherein the method comprises the following steps: Mixing, namely adding 30-70 parts by mass of ethylene-vinyl acetate maleic anhydride graft copolymer, 15-40 parts by mass of synergist, 10-30 parts by mass of dispersing agent and 1-10 parts by mass of antioxidant into a high-speed dispersing kettle, and stirring at 70 ℃ for 60 minutes at a rotating speed of 1,500 rpm; A homogenization step, namely circularly grinding for 2 times through a colloid mill to ensure that the grain diameter is less than or equal to 5 mu m to obtain light yellow transparent liquid, wherein the density is 0.92-0.95 g/cm 3 , and the kinematic viscosity is 200-300 mm 2 /s; and (2) compounding the pour point depressant, namely uniformly mixing the yellowish transparent liquid with the polymethacrylate pour point depressant according to the mass ratio of the ethylene-vinyl acetate maleic anhydride graft copolymer to the polymethacrylate pour point depressant of (1-3): 1.
  8. 8. The method for producing a compound pour point depressant according to claim 7, wherein the synergist is polyisobutylene succinic anhydride.
  9. 9. The method for producing a compound pour point depressant according to claim 7 or 8, wherein the graft ratio of the ethylene-vinyl acetate-maleic anhydride graft copolymer is 8% to 10% and the weight average molecular weight is 6 to 8 tens of thousands.
  10. 10. The method for producing a compound pour point depressant according to claim 7 or 8, wherein the dispersant is sorbitan monooleate and the antioxidant is 2, 6-di-t-butyl-p-cresol.

Description

Compound pour point depressant and manufacturing method thereof Technical Field The invention relates to a petroleum additive, in particular to a compound pour point depressant and a manufacturing method thereof. Background With the development of the petroleum industry, the flowability of petroleum products under low temperature conditions becomes an important factor affecting the use effect thereof. Particularly in cold areas, petroleum products such as diesel oil, crude oil, lubricating oil and the like are easy to solidify in a low-temperature environment, so that the fluidity is reduced, and the normal use is affected. To solve this problem, pour point depressants are widely used as an important additive in petroleum products. The pour point depressant can inhibit the aggregation and growth of wax crystals by changing the structure and growth mode of wax crystals in petroleum products, thereby reducing the condensation point and pour point of petroleum products and improving the low-temperature flow property of the petroleum products. Currently, pour point depressants commonly found on the market mainly include ethylene-vinyl acetate copolymers (EVA), polymethacrylates (PMA), ethylene-acrylate copolymers, and the like. In the prior art, patent document 1 (CN 102559302B) discloses a diesel oil pour point depressant and a preparation method, the pour point depressant can greatly reduce the cold filtration point and the condensation point of diesel oil, and is widely applicable to various diesel oils with small limitation. Patent document 2 (CN 108997991 a) discloses a composite pour point depressant comprising a polymer pour point depressant and asphalt particles, wherein the polymer pour point depressant comprises an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid ester copolymer, etc., which can simplify the composition, reduce the cost and improve the pour point depressant effect. Patent document 3 (CN 107099359B) discloses a preparation method of a diesel pour point depressant and a pour point depressant thereof, the method comprises adding polyethylene vinyl acetate and polymethacrylate into a reaction kettle, dissolving and reacting under specific conditions, and then repeatedly shearing by a shearing device, thus the preparation is simple, the cost is low, and the pour point depressant effect is good. Patent document 5 (CN 105542063B) and patent document 6 (CN 105524211B) disclose a method for preparing two kinds of tetrapolymer diesel pour point depressants, respectively, which are significantly better in pour point depressing effect than homopolymer pour point depressants of a single composition. However, the pour point depressant of the prior art has some disadvantages. First, most pour point depressants mainly aim at petroleum products such as diesel base oil, crude oil and the like, have different degrees of pour point depressing effects on different types of petroleum products, but few researches pay attention to the influence of pour point depressants on the low-temperature performance of gasoline and engine oil, in particular to the low-temperature pumping performance. Secondly, the existing pour point depressant is difficult to simultaneously meet various performance requirements of the gasoline and the engine oil in a low-temperature environment. In addition, the molecular structure design and the component proportion of the existing pour point depressant also have optimization space, and particularly have limited effect in improving the low-temperature pumping performance of the gasoline engine oil. Therefore, development of a compound pour point depressant capable of effectively improving low-temperature performance, particularly low-temperature pumping performance, of the gasoline and the engine oil is needed to meet the use requirement of the gasoline and the engine oil in a cold environment. Disclosure of Invention The invention aims to solve the technical problems that the existing pour point depressant mainly aims at the pour point depressant effect of diesel base oil and crude oil with different degrees, improves the low-temperature fluidity of the diesel base oil and crude oil, and does not mention whether the pour point depressant has an effect on the low-temperature performance of gasoline and engine oil, in particular to the low-temperature pumping performance. Accordingly, it is desirable to provide a pour point depressant that improves the low temperature performance, particularly the low temperature pumping performance, of a motor oil. The technical scheme adopted for solving the technical problems is to provide a compound pour point depressant, wherein the compound pour point depressant comprises an ethylene-vinyl acetate copolymer, a polymethacrylate pour point depressant, a synergist, a dispersing agent and an antioxidant, the ethylene-vinyl acetate copolymer is a maleic acid graft copolymer, and the mass ratio of the ethylene-vinyl acetate copolymer to the p