JPH05132682A - Diesel fuel additive composition and its usage - Google Patents

Abstract

PURPOSE:To obtain the subject composition capable of improving starting properties, noise after the starting, exhaust gases and warming properties of a diesel car or a diesel engine by blending a low-temperature fluidity improver with a cetane number improver, a cleaning agent for preventing fuel injection nozzles from fouling and a solvent in a specified proportion. CONSTITUTION:The objective composition is composed of 100 pts. total of (A) 2-15 pts. low-temperature fluidity improver such as an ethylene vinyl acetate copolymer-based additive with (B) 5-25 pts. cetane number improver such as a 6-8C alkyl nitrate, (C) 1-10 pts. cleaning agent such as an imide-based additive for preventing fuel injection nozzles from fouling and the remainder as a solvent. The composition is capable of preventing the fuel injection nozzles from fouling. Furthermore, the composition is introduced into a fuel tank of a diesel car or a diesel engine and used together with the fuel in the tank or preadded to the fuel for use. Thereby, starting properties, noise after the starting, exhaust gases and warming properties of the diesel car or diesel engine are improved.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an additive composition for improving the startability of a diesel vehicle or diesel engine, noise after starting, exhaust gas and warm-up property, and preventing fouling of a fuel injection nozzle. Regarding how to use it.

[0002]

2. Description of the Related Art Diesel diesel fuel in Japan is superior in quality to major countries in Europe and the United States, and the fuel cost is lower than gasoline vehicles. In order to improve startability especially in regions with low temperatures in the major European and American countries where the quality of diesel oil is inferior,
Although a cetane number improver of 0.1% by volume or more has been added to diesel gas oil, the cetane number of diesel oil is high in Japan, and it was not necessary to add a cetane number improver. ..

Also, regarding low temperature fluidity, sufficient quality is imparted by making JIS the clogging point, and there is no particular problem. Furthermore, it is considered that there is no particular need for a detergent to prevent contamination of the diesel fuel injection nozzle,
Since 1987, additives of this kind, which have been added to premium gas oils in Europe, were not accepted in Japan.

[0004]

[Problems to be Solved by the Invention] From the results of a questionnaire survey of drivers of 380 diesel vehicles carried out in Tokyo, Sendai, Sapporo and Asahikawa, the diesel vehicles have startability, noise after starting, exhaust gas and warm-up characteristics. It became clear that the lower the temperature, the more remarkable this problem was. Also,
Although low temperature fluidity is provided, it has been observed that light oil does not flow when an unexpected cold wave strikes.

Further, in trucks used for long-distance transportation, it is often found that the engine is idling for a long time to move the air conditioning equipment due to nap. During this period, the fuel injection nozzle becomes dirty and exhaust gas is exhausted. It was also revealed that the gas would deteriorate. Therefore, until now, the problem of diesel vehicles, which has not been considered due to the superior quality of diesel diesel oil in Japan, is attracting attention due to changes in automobile design methods and usage methods.

[0006]

[Means for Solving the Problems] Startability of a diesel vehicle or diesel engine, noise and exhaust gas after starting,
In order to improve the warm-up property and the fouling of the fuel injection nozzle as a whole, it is necessary to improve the low temperature fluidity and compression ignitability of diesel fuel, and at the same time prevent the fouling of the fuel injection nozzle. As a means for solving this, we have earnestly studied to add a mixture of a low temperature fluidity improver, a cetane number improver and a detergent for preventing contamination of a fuel injection nozzle to diesel fuel, and have invented a means for achieving this. It was

The composition of the present invention comprises 2 to 15 parts of a low temperature fluidity improver (ethylene vinyl acetate copolymer type additive) and a cetane number improver (alkyl nitrate having 6 or 8 carbon atoms).
5 to 25 parts, a detergent for preventing stains on the fuel injection nozzle (imide-based additive) from 1 to 10 parts, and the remainder as a solvent, totaling 1
The additive composition composed of 00 parts is put into a fuel tank of a diesel vehicle or a diesel engine, or is added to a fuel in advance and used. In addition, the amount of addition to the fuel is 80 to 600 ppm of the low temperature fluidity improver,
The cetane number improver is 200 to 1000 ppm, and the detergent for preventing stains on the fuel injection nozzle is 40 to 400 ppm.

[0008]

Example 1 The effect of adding the additive composition of the present invention to the fuel tank of a diesel vehicle or a diesel engine, or adding it to the fuel in advance and using it is shown in Example 1.
It is shown in Comparative Examples 1 to 3 that the effect is difficult to be recognized when each of the additives constituting the additive composition of the present invention is used alone.

(Example 1) 5 parts of a low temperature fluidity improver, 25 parts of a cetane number improver, 1 part of a cleaning agent for preventing contamination of a fuel injection nozzle and 1 part of a balance were added as a solvent, and a total of 100 parts was added. The agent composition was used in an amount of 200 ml per 50 liters of fuel. Two 2.5-ton small diesel trucks that are difficult to start at an air temperature of -10 ° C were used. After adding the additive composition to these fuel tanks, JIS No. 2 diesel oil is FULL.
It was filled up to and stopped after running for about 15 minutes. The next morning, it started without problems even at a minimum temperature of -10 ° C. Compared to the case where no additive was used, the idling noise after 1 to 3 minutes after starting was reduced by about 60%, and the black exhaust smoke was reduced by 15 and 20%. 5 per hour
After running 5 km at 0 km, the engine oil temperature was further increased by 3 to 5 ° C and the cooling water temperature was further increased by 10 to 20 ° C.

(Example 2) 10 parts of a low temperature fluidity improver,
An additive composition composed of 20 parts of a cetane number improver, 5 parts of a detergent for preventing contamination of a fuel injection nozzle and 5 parts of the rest, and a total of 100 parts was used in an amount of 200 ml per 50 liters of fuel. For a total of 174 commercial vehicles and private vehicles, the additive composition was added to the fuel tank of the vehicle immediately before refueling the light oil from the underground tank, and a questionnaire survey was conducted on the situation up to the next refueling compared with before addition (recovery 94%). The minimum temperature in the survey area was -2 to -7 ° C. As a result, 60% answered that the startability was improved, 47% answered that the black exhaust smoke had decreased after the start, and 52% answered that the warm-up property was improved and the acceleration was improved. ..

(Example 3) A low temperature fluidity improver (2 parts), a cetane number improver (15 parts), a fuel injection nozzle stain preventing detergent (10 parts) and a balance (solvent) were added in a total amount of 100 parts. The agent composition was used in an amount of 200 ml per 50 liters of fuel. Using a light oil obtained by adding an additive composition to a 4WD box type diesel van and a 2 ton small diesel truck, the concentration of particulate matter contained in exhaust gas was continuously measured after engine start and compared with that before addition. The particulate matter concentration increased with time, but the concentration decreased intermittently, and this interval was more frequent than before the addition. When the fuel injection nozzle was observed with a scanning electron microscope after the engine was stopped, it was found that the nozzle fouling at the time when the concentration of the particulate matter decreased intermittently was considerably smaller than that before the addition. The outside air temperature was 2 ° C, and JIS No. 1 light oil was used.

(Example 4) A low temperature fluidity improver of 2 parts, a cetane number improver of 10 parts, a fuel injection nozzle stain preventing detergent of 10 parts, and a balance of a solvent were added in a total amount of 100 parts. The agent composition was used in an amount of 200 ml per 50 liters of fuel. A 10-ton heavy-duty diesel truck used for long-distance transportation was idling, and after 4 hours, the bad smell of the exhaust gas became so bad that the engine was overhauled and a considerable amount of sediment was deposited on the fuel injection nozzle and combustion chamber. Was recognized. After cleaning the sediment, the engine was installed, and the fuel oil was filled with the additive composition into the fuel tank to carry out the idling operation. 5
Three people smelled the bad odor of the exhaust gas until the passage of time, and confirmed that it was sufficiently improved. The outside air temperature is 6 ° C and JI
S special No. 1 light oil was used.

Comparative Example 1 A low temperature fluidity improver (ethylene vinyl acetate copolymer-based additive) was added to JIS No. 2 diesel oil.
Addition of 00ppm, indoor temperature of diesel passenger car -10 ℃
Used in. Although there was no problem in startability, the engine oil and engine cooling water temperatures 20 minutes after start-up were 3 and 10 ° C. lower than in the case where the additive composition of the present invention was added, and the warm-up property was inferior. Do you get it.

(Comparative Example 2) A cetane number improver (alkyl nitrate having 6 or 8 carbon atoms) was added to JIS No. 3 diesel oil as 1 part.
200ppm was added and used in a 2.5 ton small diesel truck at an indoor temperature of -20 ° C. Although there was no problem in startability, the engine stopped 10 minutes after starting. The cause of the stop was because the fuel pipe of the automobile was blocked by the deposited wax. Further, the 10% residual carbon content of the fuel in the tank is 0.
At 11% by weight, this fuel was found to be off JIS K2204. On the other hand, no particular problem occurred when the additive composition of the present invention was added.

(Comparative Example 3) 400 ppm of a detergent (imide type additive) was added to JIS No. 1 diesel oil and used in a 2 ton small diesel engine at an indoor temperature of -5 ° C. The engine was started, but engine noise was found to be 30% higher than with the additive composition of the present invention.

[0016]

EFFECTS OF THE INVENTION In order to improve the low temperature fluidity and compression ignitability of diesel fuel, and at the same time prevent fouling of the fuel injection nozzle, a low temperature fluidity improver, a cetane number improver, and a fuel injection nozzle fouling preventive agent. By adding a mixture of detergents to diesel fuel, the startability of diesel cars or diesel engines, noise and exhaust gas after starting,
It was confirmed that the warm-up performance and the overall effect on the contamination of the fuel injection nozzle were exhibited.

Claims (2)

[Claims] 1. A low-temperature fluidity improver (ethylene vinyl acetate copolymer-based additive) in an amount of 2 to 15 parts, and a cetane number improver (an alkyl nitrate having 6 or 8 carbon atoms) in an amount of 5 to 2 parts.
An additive composition comprising 5 parts, 1 to 10 parts of a detergent for preventing stains on the fuel injection nozzle (imide-based additive), and the remainder being a solvent, and a total of 100 parts. 2. A method of introducing the additive composition according to claim 1 into a fuel tank of a diesel vehicle or a diesel engine and using the fuel in the tank, or a method of using a fuel to which an additive mixture has been added in advance.