JP2909650B2 - Lubricating oil composition for chainsaws - Google Patents

Description

The present invention relates to a vegetable oil-based lubricating oil composition for chainsaws.

(Problems to be solved by the prior art and invention) Lubricating oil for chainsaws has oxidation stability, heat stability,
It is desired that the material has good mechanical suitability and the like and has little change under severe conditions such as a change in viscosity during use, load capacity, frictional resistance, and air contact. If these properties are insufficient during operation, it causes seizure, wear and the like of the machine.

Conventional lubricating oils for chainsaws are mainly based on hydrocarbon-based components such as grease and liquid paraffin, but have the disadvantage that the viscosity change is large and the load-carrying capacity is small.

The present inventors have made intensive studies with the aim of solving the above-mentioned drawbacks using a highly safe vegetable oil, and as a result, have reached the present invention.

(Means for Solving the Problems) The present invention is based on vegetable oils, so-called triglycerides, and adds a small amount of natural waxes and an emulsifier.

Vegetable oil used in the present invention is rapeseed oil, rice oil, soybean oil, olive oil, sunflower oil, safflower oil, cottonseed oil,
It is a corn oil, a castor oil or the like, and is a liquid oil having a solid fat content (SFC) at 5 ° C of 5% or less and / or an iodine value of 80 or more. When the SFC at 5 ° C. is 5% or more, the crystals of fats and oils increase, causing trouble.

Vegetable oils may be further hydrogenated to increase the oxidative stability of the fats and oils, and liquid oils fractionated at 5 ° C or lower may be used. Good.

The natural wax used in the present invention is candelilla wax, carnauba wax, rice wax, beeswax, wood wax, lanolin, etc., and 0.01 to 5.0% by weight (hereinafter simply abbreviated as%) in vegetable oil, preferably 0.01 to 3.0%. Add%.

As the emulsifier, acetylated sucrose fatty acid ester, sucrose fatty acid ester, polyglycerin condensed ricinoleate, or the like is used, and functions as an inhibitor of crystallization of fats and oils. The sucrose fatty acid ester preferably has 12 or less carbon atoms in the saturated type, and the unsaturated type has a stronger effect than the saturated type. The amount of the emulsifier used is 0.1-5.0%, preferably 0.2-4.0%.

To suppress the oxidation of fats and oils, tocopherol, BH
Antioxidants such as T, BHA, citric acid, ascorbic acid, and synergist can be used.

It is desirable that the composition obtained as described above has a viscosity at 5 ° C. of 500 cp or less and is in a fluid state.

(Examples) Next, the present invention will be specifically described with reference to examples.

Example 1 1% rice wax in refined rapeseed oil having an iodine value of 118,
A lubricating oil composition was obtained by adding 0.2% of acetylated sucrose fatty acid ester. Its SFC at 5 ℃ is 0
%, And the fluidity after 5 days at 5 ° C. was good. The oil and fat crystals precipitated under the same conditions were dense and did not cause clogging of the chain saw nozzle. SFC value is 0%
Even after 30 days at 5 ° C, crystals of fats and oils precipitate during storage. Indicates that the crystal is dense. Also, a crystal that causes clogging is represented as sparse.

Table 1 shows the formulations of Examples and Comparative Examples and the test results.
Example 2 is an example in which only the rice wax of Example 1 was increased,
Example 3 is an example in which the amount of rice wax was further increased and polyglycerin condensed ricinoleate was used in combination as an emulsifier.

Example 4 Refined rapeseed oil having an iodine value of 118 was hydrogenated to an iodine value of 9
After lowering to 5, the mixture was separated at 5 ° C. to obtain a separated liquid oil having an iodine value of 96. 0.1% of beeswax and 0.2% of polyglycerin condensed ricinoleate were added thereto. 5 of this one
SFC at 2 ℃ is 2%, and fluidity after 30 days at 5 ℃ is good. Was. The oil and fat crystals precipitated under the same conditions were dense.

Example 5 is an example in which corn oil is used, beeswax and wood wax are used in combination, and sucrose fatty acid ester is used.

Example 6 A refined safflower oil having an iodine value of 145 was hydrogenated to lower the iodine value to 118, and then fractionated at 5 ° C to obtain a separated liquid oil having an iodine value of 120. To this, 1% of carnauba wax and 0.5% of acetylated sucrose fatty acid ester were added. The SFC at 5 ° C. was 3%, and the fluidity after 5 days at 5 ° C. was good. The fat crystals precipitated under the same conditions were honey.

The viscosities, friction coefficients, and load bearing capacity of the lubricating oil compositions of Examples 1 and 4 and liquid paraffins A and B generally used in chainsaws were measured.

(A) Viscosity A viscometer made by Rion was used for the viscometer.

(Unit cp) In Examples, the viscosity is lower than that of liquid paraffin below 40 ° C., and the difference is small and higher above 60 ° C. in some cases.

The examples show that there is little change in viscosity with respect to temperature, and that even when the temperature rises due to the application of frictional heat on the sliding surface, there is little sudden drop in viscosity and stable.

(B) Friction coefficient Measured by a Soda pendulum type friction tester.

The higher the value, the poorer the lubricity and the lower the better. Liquid paraffin is high even at 20 ° C, but lubricity deteriorates due to temperature rise. The embodiment is good because no change due to temperature rise is observed.

(C) Load capacity 0.5 kg / cm at 200 rpm using Soda-type four-ball testing machine
^The measurement was performed at room temperature under a pressure of ² / min.

The numerical values of the examples are high and good.

(Effects of the Invention) In the present invention, by adding a natural wax and an emulsifier to a vegetable oil, a lubricating oil composition for chainsaws having excellent fluidity and hardly causing deterioration such as oxidation and polymerization was able to be obtained.

The liquid paraffin used in chainsaws is compared with the physical properties (viscosity, coefficient of friction, load bearing capacity) required for lubrication, and these values are useful because the compositions of the present invention are all excellent. It is considered a lubricating oil composition.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ identification code FI C10N 30:06 40:10 40:32 (58) Investigated field (Int.Cl. ⁶ , DB name) C10M 101/04 C10M 129 / 74 C10M 159/06-159/08 C10N 30:00 C10N 40:10 C10N 40:32 WPI / L (QUESTEL)

Claims (2)

(57) [Claims] 1. Candelilla wax, carnauba wax, rice wax based on vegetable oil (excluding hardened oil),
1 selected from the group consisting of beeswax, water wax and lanolin
One or more emulsifiers selected from the group consisting of acetylated sucrose fatty acid esters, sucrose fatty acid esters, and polyglycerin condensed ricinoleate containing 0.01 to 5.0% by weight of one or more natural waxes To 0.
A lubricating oil composition for chainsaws containing 1 to 5.0% by weight. 2. The vegetable oil has a solid fat content (SFC) at 5 ° C.
2. The fluid chain saw according to claim 1, which is a liquid oil having a hydrogen content of 5% or less and / or an iodine value of 80 or more or a hydrogenated liquid oil and fractionated at 5 ° C. or less. Lubricating oil composition.