JPS6012393B2 - motor oil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor oil having colloidal boron nitride dispersed therein.

Motor oil is a lubricating oil for the cylinders of automobile gasoline engines or high-speed diesel engines, and is rated JIS, K Shigeru 1.
6, it is specified as a lubricating oil for land internal combustion engines.

The motor oil of the present invention is obtained by dispersing colloidal boron nitride in this JIS standard lubricating oil. In recent years, great concern has been placed on the fuel efficiency and engine durability of automobiles, and great efforts are being made to reduce fuel consumption and extend the life of the engines.

One example is the development of various additives. For example, motor oils in which molybdenum disulfide (MOS2) fine powder is added and dispersed are also commercially available. Although MoS2 is well known as a solid lubricant like boron nitride (BN), it differs from BN in various respects, such as being black in color and having a higher specific gravity than BN. This results in important differences in properties when added to motor oil. For example, there is a general belief that black motor oil is representative of deteriorated oil, and for this reason, black motor oil with MoS2 added not only reduces its commercial value, but also causes people to misjudge the timing of motor oil replacement. Also Mo
The high specific gravity of the S2 powder causes a problem of sedimentation if care is not taken when dispersing it in motor oil. 8N is a white crystal that usually has an LC crystallite size of several hundred to 1000A, and has a scale-like layered structure, and fine particles of about 1 micron can form many cleavage scales, so it has excellent lubrication performance. It has good extreme pressure properties at high temperatures, making it an excellent high-temperature solid lubricant.

However, when adding a solid lubricant to a lubricating oil, there are various restrictions depending on the purpose of use, conditions of use, etc., and it is not always effective in all cases.

That is, the solid lubricating oil must not alter the quality of the base lubricating oil, and it is also required to maintain fluidity at low temperatures without increasing the change in viscosity due to temperature. Furthermore, lubricating oil is oxidized during use, producing some organic acids and other sludge, but it is necessary that the solid lubricant added does not react with these components. Furthermore, lubricating oils contain various additives such as antioxidants, corrosion inhibitors, and detergents, and although there are various types of additives, solid lubricants must be stable against all of these additives. is necessary. In addition to motor oil, there are various lubricating oils such as turbine oil and machine oil. For example, even if adding a solid lubricant to turbine oil is effective, it is not necessarily effective for other lubricating oils. is not limited.

Lubricating oils have different physical and chemical properties depending on their purpose. For example, turbine oil is highly refined from paraffin-based crude oil, to which various additives are added, and its viscosity properties also have certain standards. Since these characteristics are unique to each lubricating oil, their effects are not the same when a solid lubricating oil is added thereto. Therefore, additives for turbine oil are not necessarily effective for motor oil. This indicates that the predictability of converting additives to pond lubricants is difficult. Even if lubricating oils are so stiff in their physical properties that no difference is discernible in their initial state, their performance may become quite noticeable after long-term use. Its performance is often confirmed only after long-term use tests are conducted under actual usage conditions. This long-term use test is especially necessary when a solid lubricant such as BN is added. For example, when motor oil containing solid lubricant is used as a cylinder lubricant for automobile gasoline engines, we comprehensively examine not only the lubrication performance but also whether there will be any problems with the oil circulation system during long-term use. There is a need to. In the present invention, colloidal BN is added and dispersed in motor oil. Motor oil is JIS
There are various kinds of motor oils as standardized by the Japanese government, but as a result of extensive practical tests on these motor oils, the present invention found that all of them with BN added have better lubrication performance and do not alter the quality of the motor oil. It was found to be stable even during use. Since BN is white and has a lower specific gravity than MoS2, it does not have the drawbacks associated with the addition of MoS2 as described above. The BN added in the present invention is colloidally dispersed in the motor oil, and the size of the BN particles is 1 micron or less, preferably 0.5 micron or less.

Further, the amount of BN added is preferably 0.1 to 5% by weight, but ~B
N is expensive, and the degree of its effect tends to decrease as the amount added increases. Considering these factors, it is particularly preferable to add 0.1 to 1% by weight. If the amount exceeds 5%, physical properties such as viscosity of the oil will be affected, and depending on the type of motor oil, usage conditions may be restricted, such as making it undesirable to use it at very low temperatures.

The first step to dispersing colloidal BN in motor oil is that most commercially available BN is around 1 to 5 microns in size.
Thoroughly grind this powder to a particle size of 1 micron or less, preferably 0.
．． Make it 5 microns or less.

Then, the pulverized BN powder is directly added to motor oil, and the dispersion state is almost stable even after a light shower.However, the most reliable method is to add BN powder and a nonionic surfactant to refined key oil. The method is to prepare a highly concentrated dispersion oil of 8N powder in advance, and then add this to motor oil to contain a predetermined amount of BN. The BN-dispersed motor oil according to the present invention spreads and adheres well to lubricating surfaces, forms a strong oil film, and has an extremely large lubrication effect.

In particular, its competitive properties against high loads are greater than motor oils containing graphite or molybdenum disulfide powder. Example Commercially available BN powder was thoroughly ground to a particle size of 0.6 microns or less, with an average particle size of 0.4#.

This was added to a commercially available motor oil (trade name: Nitsusan Motor Oil Super) along with a nonionic surfactant (manufactured by Daiichi Kogyo Seiyaku ■, trade name: Dyanol) to make a BN dispersion oil with the following composition. Ta. motor oil
9 parts by weight surfactant
2 BN powder 8
Next, this BN-dispersed oil was added to the motor oil to obtain a motor oil with a BN content shown in Table 1.

This motor oil was used as lubricating oil in the cylinder of an automobile gasoline engine, and its performance was tested.
Shown in the table.

The car used was a 1600cc sedan (4g hand type).
So, for 100 yen of fuel, the average speed is 80km/h on the expressway.
The test was conducted under the conditions of h. In addition, the 10-mode driving comparison test was repeated three times and the fuel ratio was measured. The Fujiko average values are also shown in Table 1. As is clear from the test results in Table 1, by dispersing BN powder in motor oil, fuel efficiency can be improved by approximately 10% to 15%.
% improvement was confirmed.

Claims (1)

[Claims] 1 Motor oil made of dispersed colloidal boron nitride with a particle size of 1 micron or less.