阅读说明：本技术 一种燃料汽油用多金属缓蚀剂及制备方法 (Multi-metal corrosion inhibitor for fuel gasoline and preparation method thereof ) 是由 王庆超 刘亚芳 王学义 范金凤 于 2020-06-23 设计创作，主要内容包括：本发明公开了一种燃料汽油用多金属缓蚀剂及制备方法,按质量百分比计,包括：甲基苯三唑5％～25％、十七烯基咪唑啉胺盐无灰防锈剂7％～25％、聚乙烯吡咯烷酮2％～15％、其余为溶剂；以上组分按顺序混合均匀后即得燃料汽油用多金属缓蚀剂。本发明的缓蚀剂对紫铜、黄铜、铝、钢有良好的缓蚀作用,特别地,即使是添加甲醇、乙醇的汽油,缓蚀作用依然较好。所用组分均为无灰剂型,不会对燃油储存输送系统及发动机造成灰分影响；同时所加组分本身无腐蚀性,组分种类少,原料成本低,为生产使用带来了极大方便。(The invention discloses a multi-metal corrosion inhibitor for fuel gasoline and a preparation method thereof, wherein the corrosion inhibitor comprises the following components in percentage by mass: 5-25% of methylbenzotriazole, 7-25% of heptadecenyl imidazoline amine salt ashless antirust agent, 2-15% of polyvinylpyrrolidone and the balance of solvent; the components are mixed evenly in sequence to obtain the multi-metal corrosion inhibitor for the fuel gasoline. The corrosion inhibitor has good corrosion inhibition effect on red copper, brass, aluminum and steel, and particularly has good corrosion inhibition effect even if methanol and ethanol are added into gasoline. The used components are ash-free formulations, so that ash influence on a fuel storage and delivery system and an engine is avoided; meanwhile, the added components have no corrosiveness, the types of the components are few, the cost of the raw materials is low, and great convenience is brought to production and use.)

1. The multi-metal corrosion inhibitor for fuel gasoline is characterized by comprising the following components in percentage by mass:

5-25% of methylbenzotriazole, 7-25% of heptadecenyl imidazoline amine salt ashless antirust agent, 2-15% of polyvinylpyrrolidone and the balance of solvent.

2. The multimetallic corrosion inhibitor for fuel gasoline of claim 1, wherein the solvent comprises, in mass percent, isooctanol in an amount of 10% to 25% of the total mass of the corrosion inhibitor, N-dimethylformamide in an amount of 10% to 20% of the total mass of the corrosion inhibitor, and kerosene as the remainder.

3. The multimetal corrosion inhibitor for fuel gasoline of claim 2, wherein the kerosene is added in a proportion of not less than 10% by mass of the total mass of the corrosion inhibitor.

4. The multimetal corrosion inhibitor for fuel gasoline of claim 3, comprising, in mass percent:

20% of methylbenzotriazole, 20% of heptadecenyl imidazoline amine salt ashless antirust agent, 15% of polyvinylpyrrolidone, 20% of isooctanol, 15% of DMF and 10% of kerosene.

5. The multimetallic corrosion inhibitor for fuel gasoline of any one of claims 1-4, wherein said polyvinylpyrrolidone is K12 polyvinylpyrrolidone.

6. A method of preparing the multimetal corrosion inhibitor for fuel gasoline as set forth in any one of claims 2-4, comprising:

sequentially dissolving methylbenzotriazole and polyvinylpyrrolidone in isooctyl alcohol and N, N-dimethylformamide;

after the materials are fully dissolved, sequentially adding kerosene and heptadecenyl imidazoline amine salt ashless antirust agent, uniformly stirring and filtering to obtain the finished product.

7. The method according to claim 6, wherein the temperature for dissolving the methylbenzotriazole and the polyvinylpyrrolidone is 70 ℃.

Technical Field

The invention relates to the technical field of gasoline additives, in particular to a polymetallic corrosion inhibitor for fuel gasoline and a preparation method thereof.

Background

Gasoline is an important energy source, however, gasoline contains small amounts of active sulfur compounds, such as low molecular mercaptans, which cause fuel gasoline to have a very small amount of corrosivity. The alcohol fuel changes the polarity of original gasoline due to the addition of methanol or ethanol, changes nonpolar gasoline into medium polarity alcohol fuel, and aggravates the corrosion problem of oil products to parts such as storage tanks, oil transportation systems and the like to a certain extent. Meanwhile, a small amount of water and acidic substances are introduced, so that the corrosivity of oil products is increased, and the service lives of an oil tank and an oil transfer pump can be shortened. Therefore, there is a need to add fuel oil corrosion inhibitors to fuel gasoline to reduce or avoid the occurrence of corrosion.

A plurality of fuel oil corrosion inhibitors are sold in the market, and the fuel oil corrosion inhibitors are added into the ethanol gasoline when the ethanol gasoline leaves a factory so as to avoid the corrosion problem caused by the fuel oil. The protection effects of different corrosion inhibitors on metals in an engine and an oil way are not consistent, and metal elements are added in the formula of some corrosion inhibitors, so that ash is generated, and the engine is abraded and the three-way catalyst is blocked; some corrosion inhibitors are troublesome to prepare and complex in components.

Patent CN 104830386 discloses a methanol gasoline corrosion inhibitor, which uses strong alkaline sodium hydroxide and polyethylene diamine, and has certain corrosivity; the introduced sodium metal ions produce ash upon combustion.

Patent CN106459811 discloses a multi-purpose corrosion inhibitor formula, which shows better effect in experiments, but the formula needs to carry out secondary reaction on raw materials, thus increasing the difficulty and cost of preparation.

Meanwhile, the commercially available fuel oil corrosion inhibitor has a good protection effect on aluminum steel materials through inspection, but has insufficient protection on red copper and brass, and obvious corrosion phenomena can be seen in a sheet metal corrosion experiment.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the multi-metal corrosion inhibitor for the fuel gasoline and the preparation method thereof, wherein the corrosion inhibitor has few component types and simple preparation, and can effectively reduce the corrosion of the fuel gasoline to oil paths and engines.

The invention discloses a multi-metal corrosion inhibitor for fuel gasoline, which comprises the following components in percentage by mass:

5-25% of methylbenzotriazole, 7-25% of heptadecenyl imidazoline amine salt ashless antirust agent, 2-15% of polyvinylpyrrolidone and the balance of solvent.

As a further improvement of the invention, the solvent comprises, by mass percent, isooctanol accounting for 10-25% of the total mass of the corrosion inhibitor, N-dimethylformamide accounting for 10-20% of the total mass of the corrosion inhibitor, and the balance of kerosene.

As a further improvement of the invention, the addition proportion of the kerosene is not less than 10 percent of the total mass of the corrosion inhibitor according to the mass percentage.

As a further improvement of the invention, the method comprises the following steps by mass percent:

20% of methylbenzotriazole, 20% of heptadecenyl imidazoline amine salt ashless antirust agent, 15% of polyvinylpyrrolidone, 20% of isooctanol, 15% of DMF and 10% of kerosene.

As a further improvement of the invention, K12 polyvinylpyrrolidone is selected as the polyvinylpyrrolidone.

The invention also discloses a preparation method of the multi-metal corrosion inhibitor for fuel gasoline, which comprises the following steps:

sequentially dissolving methylbenzotriazole and polyvinylpyrrolidone in isooctyl alcohol and N, N-dimethylformamide;

after the materials are fully dissolved, sequentially adding kerosene and heptadecenyl imidazoline amine salt ashless antirust agent, uniformly stirring and filtering to obtain the finished product.

As a further improvement of the invention, the temperature for dissolving the methylbenzotriazole and the polyvinylpyrrolidone is 70 ℃.

Compared with the prior art, the invention has the beneficial effects that:

the corrosion inhibitor of the invention is used for treating common metals in engines and oil supply systems: brass, red copper, aluminum and steel have excellent corrosion inhibition effect, and the effective components contained in the corrosion inhibitor can correspondingly form a protective film on the surface of metal to prevent the corrosion of the corrosive components in the fuel gasoline to the metal. Meanwhile, the corrosion inhibitor of the invention has little dosage when in use, and can ensure that the corrosivity of fuel gasoline (gasoline containing methanol and ethanol) can completely reach the copper sheet corrosion level below 1 by adding 200 ppm; in a 21-day metal sheet corrosion experiment, the corrosion inhibition rates of brass, red copper, aluminum and 20# steel reach 95%, 96%, 91% and 89% respectively.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The invention provides a multi-metal corrosion inhibitor for fuel gasoline and a preparation method thereof, wherein the corrosion inhibitor comprises the following components in percentage by mass: 5-25% of methylbenzotriazole, 7-25% of heptadecenyl imidazoline amine salt ashless antirust agent, 2-15% of polyvinylpyrrolidone and the balance of solvent; the components are mixed evenly in sequence to obtain the multi-metal corrosion inhibitor for the fuel gasoline. The corrosion inhibitor has good corrosion inhibition effect on red copper, brass, aluminum and steel, and particularly has good corrosion inhibition effect even if methanol and ethanol are added into gasoline. The used components are ash-free formulations, so that ash influence on a fuel storage and delivery system and an engine is avoided; meanwhile, the added components have no corrosiveness, the types of the components are few, the cost of the raw materials is low, and great convenience is brought to production and use.

The invention is described in further detail below:

the invention provides a multi-metal corrosion inhibitor for fuel gasoline, which comprises the following components in percentage by mass:

5% -25% of methylbenzotriazole, preferably 10-20%, and more preferably 20%;

7-25% of heptadecenyl imidazoline amine salt ashless antirust agent, preferably 10-20%, and more preferably 20%; further, the code of the heptadecenyl imidazoline amine salt ashless antirust agent in the Chinese market is T703, and products of the type can be used in the formula of the invention without obviously influencing the effectiveness of the formula.

2 to 15 percent of polyvinylpyrrolidone (PVP); preferably 5 to 15%, and more preferably 15%; furthermore, the types of the commercially available polyvinylpyrrolidone are more, the types used are K15 and K12, more preferably K12, and the selection of other types will cause the problem of dissolution, but the formula effect is not influenced under the condition of consistent addition amount.

The balance of solvent; wherein, the solvent comprises isooctanol accounting for 10-25% of the total mass of the corrosion inhibitor, N-Dimethylformamide (DMF) accounting for 10-20% of the total mass of the corrosion inhibitor, and the balance of kerosene; the addition proportion of the kerosene is not less than 10 percent of the total mass of the corrosion inhibitor.

The invention provides a multi-metal corrosion inhibitor for fuel gasoline, which comprises the following components in percentage by mass:

20% of methylbenzotriazole, 20% of heptadecenyl imidazoline amine salt ashless antirust agent, 15% of polyvinylpyrrolidone, 20% of isooctanol, 15% of DMF and 10% of kerosene.

The invention also provides a preparation method of the multi-metal corrosion inhibitor for fuel gasoline, which comprises the following steps:

s1, sequentially dissolving methylbenzotriazole and polyvinylpyrrolidone in isooctanol and N, N-dimethylformamide;

and S2, after being fully dissolved, sequentially adding kerosene and heptadecenyl imidazoline amine salt ashless antirust agent, uniformly stirring and filtering to obtain the finished product.

Further, when the methylbenzotriazole and the polyvinylpyrrolidone are dissolved, heating may be appropriately conducted (70 ℃ C. or less) to accelerate the dissolution of the solid components.

Further, the filtering step is to remove a small amount of insoluble impurities remaining in the solid material, and is selected according to the purity of the raw material.