JPH0488091A - Additive composition for gasoline - Google Patents

Abstract

PURPOSE:To provide the subject composition capable of remarkably deposits at the intake valves of engines for automobiles by compounding a specific alkylamine, a polyoxyalkylene glycol (derivative) and a lubricant fraction as main components. CONSTITUTION:The objective composition comprises (A) an alkylamine having a polyolefin polymer as an alkyl group thereof and having a mol.wt. of 500-5000, preferably 1000-3000, (B) a polyoxyalkylene glycol (derivative) having a mol.wt. of 500-5000, preferably 1000-3000, and (C) a lubricant fraction having a viscosity of 3-35mm<2>/S (100 deg.C) as main components.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gasoline additive composition, and more particularly to a gasoline additive composition that can significantly reduce deposits in the intake valves of automobile engines.

[Conventional technology]

Conventionally, polyalkenylsuccinimide and hydroxypolyether polyamine have been known as cleaning agents for carburetors and engines in automobiles, and polyalkenylsuccinimide and oxy compounds are dispersed in organic solvents such as xylene as gasoline additive compositions. Alternatively, dissolved ones are also known.

[Problem to be solved by the invention]

The present invention relates to improvements in this type of gasoline additive composition, and in particular, it is an object of the present invention to provide a gasoline additive composition that significantly reduces deposits in intake valves.

[Means to solve the problem]

The gasoline additive composition of the present invention comprises an alkylamine having a molecular weight of 500 to 5,000 and having a polyolefin polymer as an alkyl group component, a polyoxyalkylene glycol or a derivative thereof having a molecular weight of 500 to 5,000, and a viscosity of 3
The main component is a lubricating oil fraction of mm2/s to 35 mm2/5 (100°C).

The alkylamine used in the present invention has a polyolefin polymer as an alkyl group component, and examples of olefins used in its production include ethylene, propylene, 1-butene, isobutylene, 1-hexene, and 2-methylpentene. α-olefins having 2 to 8 carbon atoms such as -1,1 octene can be used. The polyolefin polymer is preferably polypropylene or polyisobutylene.

As a method for producing an alkylamine, for example, the above polyolefin polymer is reacted with cyanoethylene to produce a polyalkenylcyanoethane, and the polyalkenylcyanoethane is further hydrogenated in the presence of a hydrogenation catalyst.

It is best to use an alkylamine with a molecular weight of 500 to 5,000, preferably 1,000 to 3,000. If the molecular weight is less than 500, the effect of preventing deposits from adhering will be significantly reduced, and if it exceeds 5,000, it will cause problems on the intake valve surface. It is not preferable because it reduces fluidity and becomes a substance that causes deposits.

Alkylamine is 10 ppm to total amount of gasoline.
It is preferable to add it so that it contains 5000 ppm.

Polyoxyalkylene glycol is represented by the general formula % (where R1 is an alkylene group, preferably ethylene, propylene, butylene, or a mixed alkylene group thereof).

Examples of polyoxyalkylene glycol derivatives include ether compounds, ester compounds, and ether/amino acid ester compounds.

Ether compounds include monoethers represented by the general formula % and diethers represented by the general formula R2Q-4(,-(OR+),,-,OR,2).

(However, R1 is the same as above, R2 is aliphatic,
It represents a cycloaliphatic or aromatic hydrocarbon group, and R2 in diethers may be the same or stationary.

) In particular, R2 is methyl, ethyl, propyl, isopropyl, butyl, isobutyl, (t)-butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, phenyl, benzyl, tolyl, xylyl, phenethyl, p-methoxyphenyl, Cyclohexyl and cyclopentyl groups are preferred.

As an ester compound, the general formula %formula% Monoesters represented by and the general formula R3COO-R, -(OR,)l, -0COR.

There are diesters shown by

(However, R1 and R2 are the same as above, but R2 may be hydrogen, and R3 represents a fatty acid residue.) The fatty acids in R3 include acetic acid, propionic acid, acetic acid, valeric acid,
caproic acid, heptanoic acid, caprylic acid, pelargonic acid,
n-decanoic acid, n-undecanoic acid, n-dodecanoic acid (lauric acid), n-pentadecanoic acid, n-heptadecane L
n-hexadecanoic acid (palmitic acid), n-octadecanoic acid (stearic acid), n-eicosanoic acid, n-tocosanoic acid (behenic acid), n-pentaeicosanoic acid, η-hebutaeicosanoic acid, n-hexaeicosanoic acid, Examples include η-octaeicosanoic acid, n-)liacontanoic acid, etc. Mixed fatty acids derived from natural products such as fish oil fatty acids, beef tallow fatty acids, and coconut fatty acids can also be used, and preferably hydrogenated fatty acids are used.

Furthermore, the ether/amino acid ester compound is an ester of polyoxyalkylene glycol or its monoalkyl ether and ω-amino fatty acid, as shown by the following formula.

Formula % Formula % (In the formula, R' is hydrogen or a lower alkyl group, R1+ is a lower alkylene group. m is an integer of 2 to 8.) In the formula, R" is hydrogen or a lower alkyl group, preferably Methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, octyl group, and R'' is a lower alkylene group, preferably ethylene group (-CH, -C112-)
, propylene group (-CH(CH3)-[:It2-),
Butylene group (CI((C2H5)-CH2)) is preferred.

These polyoxyalkylene glycols or derivatives thereof have a molecular weight of 500 to 5000, preferably 1000 to 5000.
It is best to use one with a molecular weight of 3,000. If the molecular weight is less than 500, the effect of preventing deposits from adhering will be significantly reduced, and if it exceeds 5,000, the fluidity on the intake valve surface will decrease, which may itself be the cause of deposits. This is not desirable because it becomes a substance.

The polyoxyalkylene glycol or its derivative is preferably added in an amount of 10 ppm to 5000 ppm based on the total amount of gasoline.

In the gasoline additive composition of the present invention, the alkylamine adheres to the intake valve surface together with polyoxyalkylene glycol or its derivative, thereby exhibiting an effect of preventing deposits from adhering to the intake valve.

Furthermore, in the gasoline additive composition of the present invention, a lubricating oil fraction is added as a carrier oil, and the lubricating oil fraction has good compatibility with alkylamines, polyoxyalkylene glycols, or derivatives thereof, and It has the function of increasing the fluidity and solubility of alkylamine, polyoxyalkylene glycol, or their derivatives in gasoline after gasoline evaporates on the valve surface, and preventing the deposition of deposits.

Such a lubricating oil fraction is 3 mm2/s to 35
There are lubricating oil fractions with a viscosity of mm2/s (100°C), for example, raffinate obtained by extracting vacuum distillate oil with a solvent such as phenol, furfural, N-methylpyrrolidone, etc. Hydrocarbon distillate oil obtained after solvent derailment treatment with a solvent of A mixture with residual oils subjected to solvent extraction, solvent derailing and solvent deasphalting treatments can be used. Also, contact derailment treatment may be performed instead of solvent derailment treatment.

These refined mineral oils are lubricating oil fractions that are either paraffinic, naphthenic, etc., singly, or a mixture of these.

If the viscosity of the lubricating oil fraction is less than 3 mm2/s, it will evaporate together with gasoline and will no longer function as a carrier oil, and if it exceeds 35 mm2/s, the fluidity will decrease and the lubricating oil fraction itself will become a part of the deposits. This is not desirable because it becomes a causative substance.

The lubricating oil fraction is 0 parts by weight of the total amount of alkylamines, polyoxyalkylene glycols or derivatives thereof.
．． It is advisable to use 1 to 5 parts by weight.

The gasoline to which the composition of the present invention is added includes straight-run naphtha,
It is a common automotive fuel with a gasoline boiling range obtained from polymerized gasoline, natural gasoline, or catalytically cracked or thermally cracked or catalytically reformed feedstocks.

In addition to the composition of the present invention, for example, methyl tert
- octane improvers such as butyl ether (MTBE),
Antistatic agents, corrosion inhibitors, antioxidants, anti-icing agents, dyes, etc. may be added.

[Action and effect of invention]

The gasoline additive composition of the present invention has thermal stability due to its main components being an alkylamine, a polyoxyalkylene glycol or a derivative thereof, and a lubricating oil fraction having a viscosity of 3 mm2/s to 35 mm2/s (100°C). In addition to having excellent properties, additives such as alkylamines, polyoxyalkylene glycols, or their derivatives exhibit a deposit adhesion prevention effect, and the lubricating oil fraction functions as a carrier oil for the additives, making them effective for dispersion in gasoline. Excellent in
This can effectively prevent deposits from adhering to metal surfaces such as intake valves.

The gasoline additive composition of the present invention will be explained below with reference to Examples.

[Example 1] Density 0. 7528/cm2 (15°C), Reid vapor pressure 0. 750Kgf/cm2 (37.8℃), aromatic content 402%, olefin content 19.6%, 10% distillation temperature 4
6.5°C, 50% distillation temperature 99.0°C, 90% distillation temperature 147.0°C. Weight ppm ■, polyoxypropylene glycol (molecular weight 1000) is 100 weight ppm1 ■ based on the total amount of gasoline, viscosity is 4. 7mm2/s (100℃) lubricating oil (150 neutral oil) per total amount of gasoline
00 ppm by weight was added to gasoline to prepare sample oil 1.

Using this sample oil 1 and a multigrade oil (SAE engine oil viscosity number 10W30) as an engine oil, a deposit accumulation test on an intake valve was conducted using an actual machine.

For this test, a Toyota IGFE engine (inline 6 cylinder 4 valve system) connected to a dynamometer was used, and after operating for 100 hours under specified conditions, the engine was disassembled, the intake valves were taken out, and deposits were removed. The condition was visually evaluated based on the evaluation criteria of the CRC method using a 10-point scale ranging from score 1 for the maximum amount of deposits to score 10 for no deposits. In addition, the weight of the deposit was determined by direct measurement. The number of samples (intake valves) was n-12.

The results are shown in the table below.

[Example 2] In place of the polyoxypropylene glycol in Example 1, the same amount of polyoxypropylene glycol monobutyl ether (molecular weight 1100) was added to prepare sample oil 2.

Using this sample oil 2, the same test as in Example 1 was conducted, and the results are also shown in the table.

[Example 3] In place of the polyoxypropylene glycol in Example 1, the same amount of polyoxypropylene glycol acetate (molecular weight 1100) was added to prepare sample oil 3.

Using this sample oil 3, the same test as in Example 1 was conducted, and the results are also shown in the table.

[Example 4] In place of the polyoxypropylene glycol in Example 1, an ester of polyoxyisobutylene glycol monobutyl ether and 3-aminopropionic acid (
Molecular weight 1000. Sample oil 4 was prepared by adding the same amount of decomposition start temperature 320°C).

Using this sample oil 4, the same test as in Example 1 was conducted, and the results are also shown in the table.

[Comparative Example 1] Comparative oil 1 was prepared using only gasoline without adding any additives in Example 1, and the same tests as in Example 1 were conducted. The results are also shown in the table.

”’ CRC method

Claims (1)

[Claims] (1) Alkylamine with a molecular weight of 500 to 5,000 whose alkyl group component is a polyolefin polymer, polyoxyalkylene glycol or its derivatives with a molecular weight of 500 to 5,000, and a viscosity of 3 mm^2/s to 35 mm^2
/s (100°C) A gasoline additive composition whose main component is a lubricating oil fraction.