JP5584749B2 - Lubricant composition - Google Patents

Description

The present invention relates to a lubricant composition that can be suitably used for sliding parts of, for example, a printing machine, a bookbinding machine, a paper processing machine, and peripheral devices associated therewith.

In order to prevent seizure, it is necessary to take some measures in the sliding portions of the printing machine, bookbinding machine, paper processing machine, and peripheral devices attached thereto. Conventionally, an oil-based lubricant (for example, Patent Document 1) has been applied to such a sliding portion for this purpose.

However, when an oil-based lubricant is used in this way, the lubricant may be scattered. When the lubricant scatters in this way, it is likely to cause a printing defect in a printing machine, for example. Therefore, fine adjustment of the coating amount, wiping with a waste cloth after application, installation of an oil receiver and the like are necessary, and there are inconveniences that it takes time and effort to take measures. Furthermore, such oil-based lubricants are liable to adhere to paper dust, and it has been necessary to frequently wash the sliding portions.
In addition, it is necessary to apply the lubricant again after cleaning.

As described above, the sliding part is seized if the troublesome application of the lubricant is not performed, and when the lubricant is applied, it scatters and causes a problem of conflict. And effective countermeasures have not been taken against such a current situation.
Japanese Patent Laid-Open No. 6-1000087

The present invention has been made in view of the above circumstances, and can be suitably used for a printing press, a bookbinding machine, a paper processing machine, and peripheral devices attached to these, and once applied, it is not necessary to clean the sliding portion. It is an object of the present invention to provide a glaze composition that can lubricate a sliding part without scattering.

In order to achieve the above object, the present invention provides a lubricant composition that includes only a solid or semi-solid oiliness improver (including only those that exhibit a liquid state when used in a sliding part) A diamond particle cluster having an average particle diameter of 15 nm, which is an aggregate of diamond particles having an average particle diameter of 5 nm coated with amorphous carbon, and a fatty acid ester A lubricant dispersed in a first dispersion solvent composed of an organic sulfur compound and a phosphate ester is dispersed in a second dispersion solvent composed of a hydrocarbon-based organic solvent and a lower alcohol, and aerosolized. (First embodiment).

The lubricant composition according to the present invention is a different form of a solid or semi-solid oiliness improver (including only those that exhibit a liquid state when used in a sliding part, and A diamond particle cluster having an average particle size of 15 nm, which is an aggregate of diamond particles having an average particle size of 5 nm and coated with amorphous carbon, a fatty acid ester, an organic sulfur compound, A lubricant dispersed in a first dispersion solvent composed of a phosphate ester, and an antiwear agent are dispersed in a second dispersion solvent composed of a hydrocarbon-based organic solvent and a lower alcohol, and aerosolized. It is characterized by being (2nd form).

According to the present invention, it can be suitably used for a printing machine, a bookbinding machine, a paper processing machine, and peripheral devices associated therewith, and once applied, the sliding part is not required to be washed and is not scattered. A lubricant composition capable of performing the above-described lubrication is provided. The lubricant composition according to the present invention has an advantage that the sliding portion is cleaned and the lubricant is applied only once. Therefore,
The work time can be expected to be greatly reduced, and the work burden is greatly reduced.

  Hereinafter, the lubricant composition according to the present invention will be described in more detail.

The lubricant composition according to the first aspect of the present invention is a solid or semi-solid oiliness improver (including only those that exhibit a liquid state when used in the sliding portion, and A diamond particle cluster having an average particle size of 15 nm, which is an aggregate of diamond particles having an average particle size of 5 nm and coated with amorphous carbon, a fatty acid ester, an organic sulfur compound, A lubricant dispersed in a first dispersion solvent composed of a phosphate ester is dispersed in a second dispersion solvent composed of a hydrocarbon organic solvent and a lower alcohol, and aerosolized.

As a diamond particle cluster constituting the solid lubricant, JP-A-2002-26
It is preferable to use those disclosed in No. 5968.
The diamond particle cluster is an aggregate of a plurality of unit particles and has an average particle size of about 1
5 nm ultrafine particles. The unit particle has a genuine diamond particle as a nucleus and has a carbonaceous material having a pseudo-diamond structure in the outer shell, and the outer shell is covered with amorphous carbon. Diamond particles including the outer shell of a pseudo diamond structure have an average particle diameter of about 5 nm and are composed of elements of approximately 86% C, 0.1% H, 2, 5% N, and 11.4% O. .

A diamond particle cluster having such a structure is obtained by exploding TNT explosives in a closed container, and at this time, diamond formed by free carbon from TNT generated at high pressure and high temperature is formed as a nucleus. . This diamond particle cluster is commercially available.

Examples of the oil improver include octanoic acid, nonanoic acid, decanoic acid, undecanoic acid,
Lauric acid, myristylic acid, palmitic acid, stearic acid, eicosanoic acid, behenic acid, tetracosanoic acid, petrothelic acid, oleic acid, elaidic acid, erucic acid, other fatty acids such as modified fatty acids, fatty acid esters, glycerin fatty acid esters, sorbitan fatty acid esters , Polyglycerin fatty acid ester, propylene glycol fatty acid ester, higher alcohol fatty acid ester, polyalcohol fatty acid ester, fatty acid amide, fatty acid nitrile, fatty acid amine, fatty acid alkanolamide, fatty acid derivatives such as these modified products, decyl alcohol, undecyl alcohol, Lauryl alcohol, tridecyl alcohol, myristyl alcohol, pentadecyl alcohol, cetyl alcohol, margaryl alcohol, stearyl alcohol, nonadeci Alcohol, eicosyl alcohol glyceryl alcohol, higher alcohols, and waxes obtained from petroleum solid or semi-solid at another normal temperature such as melissyl alcohol, can be used other compounds. These may be used singly or in combination of two or more unless they are contrary to the object of the present invention.
Moreover, unless it is contrary to the objective of this invention, an oiliness improver can mix and use one or both of a semi-solid thing and a solid thing. Moreover, what mixed the liquid oiliness improver into what mixed one or both of the semi-solid thing and the solid thing can also be used if it is a semi-solid thing.
Here, solid means that it is solid in use in the sliding portion. Normal temperature (20-2)
5), the melting point is 20 ° C. or more and less than 200 ° C. The melting point is preferably 20 ° C. or higher and lower than 150 ° C. The melting point is more preferably 30
It is not lower than 110 ° C. The most preferred solid oily improver is a fatty acid amide.
The semi-solid oiliness improver refers to an oiliness improver that does not exhibit a typical solid state when used in a sliding portion but exhibits a paste-like or soft wax state. In the present invention, a material containing only a liquid state in use in the sliding portion is not suitable as an oiliness improver. In other words, the oiliness improver employed in the present invention is excluded from a form including only those that exhibit a liquid state when used in the sliding portion. Of course, the thing which exhibits a gas state by the use condition in a sliding part is also excluded.

The first dispersion solvent functions to disperse diamond particle clusters at a nano level by using a highly polar fatty acid ester, an organic sulfur compound, and a phosphate ester. Also,
Organic sulfur compounds and phosphate esters also play a role of improving extreme pressure properties.

The oil dispersion improver and the first dispersion solvent in which the diamond particle cluster (solid lubricant) is dispersed are composed of a fatty acid ester, an organic sulfur compound, and a phosphate ester, which are (40 to 70) by weight ratio: ( 1-30): The thing formed by mix | blending by (10-40) is used.

As the fatty acid ester, fatty acids purified from natural animal oils and vegetable oils,
Fatty acid esters with mono- or polyhydric alcohols can be suitably used. Further preferred are fatty acid esters of fatty acids having 8 to 18 carbon atoms and polyhydric alcohols. Further, a more preferable one is a fatty acid ester of a fatty acid having 8 to 12 carbon atoms and trimethylolpropane.

Examples of the organic sulfur compound include natural animal oils, vegetable oils and fish oils and fats added or crosslinked, natural animal oils, vegetable oils and fish oils and fatty acids obtained by purifying fatty acids and alcohols. At least one selected from the group consisting of a fatty acid ester reacted with sulfur and a mineral oil or synthetic hydrocarbon oil reacted with sulfur is preferred. The reaction for reacting sulfur is preferably an addition reaction or a crosslinking reaction.
Of these organic sulfur compounds, the most preferred are sulfur crosslinked polymer esters.

As said phosphate ester, what substituted all the hydrogen of the hydroxyl group of phosphoric acid with the hydrocarbon group can be used suitably. Among these, a more preferable one is a phosphate ester whose hydrocarbon group is an aromatic hydrocarbon group.

When the first dispersion solvent is prepared by blending a fatty acid ester having 8 to 12 carbon atoms and a fatty acid ester of trimethylolpropane, a sulfur crosslinked ester polymer, and a phosphate ester of an aromatic hydrocarbon group, these three components are added. (55-65) :( 10-20) :( 20-3)
0) is preferred. With this formulation, the dispersion of the oiliness improver and the diamond particle cluster (solid lubricant) is particularly good.

As a second dispersion solvent for dispersing a lubricant obtained by dispersing an oiliness improver and diamond particle clusters in the first dispersion solvent, a second dispersion comprising a hydrocarbon-based organic solvent and a lower alcohol is used. Use solvent.
The second dispersion solvent is a weight ratio of the hydrocarbon-based organic solvent and the lower alcohol (100 to 1).
: (1 to 100).

Examples of the hydrocarbon-based organic solvent that can be used include paraffin, isoparaffin, naphthene, aroma, and mixtures and modified products thereof having a boiling range of 0 to less than 250 ° C. As the hydrocarbon organic solvent, those having a boiling range of less than 50 to 250 ° C. are more preferable. More preferably, the hydrocarbon-based organic solvent has a boiling point range of 80 to 15.
It is less than 0 ° C.

Examples of the lower alcohol that can be used include methanol, ethanol, isopropyl alcohol, normal propyl alcohol, butanol, and mixtures and modified products thereof.

The hydrocarbon solvent is most preferably isoparaffin having a boiling range of 110 to 140 ° C., and the lower alcohol is most preferably normal propanol-modified ethanol. When these two components are blended to prepare the second dispersion solvent, these two components are mixed in a weight ratio (
90-50): (10-45) is preferred.

The lubricant composition according to the first embodiment can be obtained by aerosolizing an oiliness improver dispersed in a solvent and a solid lubricant.
As the filler for aerosolization, LPG (liquefied propane gas) or DME (dimethyl ether) is suitable.

Aerosolization is performed by filling the above-mentioned solid oily improver, solid lubricant, and solvent mixture into a dedicated pressure vessel, sealing with a valve, and using a compressed air from the valve nozzle, a propellant of LPG or DME (filler). It can be carried out by filling. When a solid lubricant or the like is included in the component, it is desirable to put a spherical glass ball, a resin ball, an iron ball or the like having a diameter of about 1 cm in a dedicated pressure resistant container in order to improve dispersibility.

The diamond particle cluster is an ultrafine particle and is extremely physically and chemically stable. Therefore, even if other solid lubricants are employed, there is no adverse effect. In particular, when used in combination with other solid lubricants, it exhibits a synergistic effect with the performance of each lubricant. Other solid lubricants that can be used include PTFE, graphite, molybdenum disulfide, boron nitride, melamine cyanurate, and metal oxides such as ZnO.

In the first embodiment, generally, 0.01 to 5 parts by weight of oiliness improver is 0.01 to 5 parts by weight.
1 part by weight of the diamond particle cluster is blended, and 5 to 20 parts by weight of the first dispersion solvent is added to 1 to 6 parts by weight of these combined. Then, 10 to 50 parts by weight of the second dispersion solvent is added to 6 to 26 parts by weight of these. Furthermore, 16-526 which combined these
In aerosolizing parts by weight, 160 to 526 parts by weight (stock solution) and propellant gas (L
PG or DME) is optimally adjusted by weight ratio between stock solution: propellant gas = 7: 3 to 5: 5.

Furthermore, specifically, (1-5) :( 5-15) is suitable for the weight ratio of the combination of the above-described solid oiliness improver and diamond particle cluster to the first dispersion solvent. . The weight ratio of the total of the first dispersion solvent and the second dispersion solvent is (5 to 30):
(70-95) is preferred.

In addition, in the lubricant composition of this Embodiment, another additive can be mix | blended unless it is contrary to the objective. For example, as a means for improving the dispersibility of the lubricant composition inside the aerosol can and the wettability (leveling property) during coating, a fluorosurfactant, an acetylene glycol surfactant, or an anionic surfactant 0.04 parts by weight per 100 parts by weight of the dispersion solvent.
1-1 weight part can be mix | blended.

When the lubricant composition according to the first embodiment is sprayed on, for example, a sliding portion of a printing press,
First, the dirt adhering to the sliding portion is washed away by the synergistic effect of the hydrocarbon-based organic solvent, which is the dispersion solvent in the second dispersion solvent, and the lower alcohol.

The dirt on the sliding part and its periphery is mixed with grease, oil, paper powder, dust, and anti-adhesion powder that have exuded from the machine. This is dissolved with a hydrocarbon-based organic solvent and a lower alcohol, and the dirt is removed by a synergistic effect by the spray pressure of the aerosol. Since a hydrocarbon organic solvent and a lower alcohol are used as components of the second dispersion solvent, the viscosity is low and the penetrating power is high. For this reason, the lubricant composition according to the present invention can easily enter a sliding portion having a clearance of 20 μm or less and wash out dirt.

Then, the lower alcohol and the hydrocarbon-based organic solvent quickly volatilize, and a lubricating film is formed on the sliding portion.
Since the formed lubricating film contains a semi-solid or solid oily improver, it has the effect of forming a liquid or semi-solid lubricating film and holding the diamond particle clusters on the lubricating surface. Due to the crystallinity of the semi-solid or solid oily improver, there is no oozing or excessive penetration like conventional oily lubricants.

After forming the lubricating film, the diamond particle cluster fills the sliding portion and flattens it to improve lubricity. The semi-solid or solid oiliness improver, the first dispersion solvent has the role of holding the diamond particle clusters in the sliding part, and when the lubrication partly becomes boundary lubrication and metal contact occurs and generates heat, the metal surface It forms a reaction film and has the role of producing extreme pressure.

Furthermore, the diamond particle cluster can act as a micro bearing on the sliding surface and exhibit lubricity.
The semi-solid or solid oil improver is dissolved in the first dispersion solvent, the second dispersion solvent, and a filler such as LPG as described above in order to uniformly disperse the diamond particle clusters in nm units. Must. Furthermore, when part of the lubrication becomes boundary lubrication and heat is generated due to metal contact, the liquid or semi-solid film has a melting point of the solid oily improver in the above-mentioned range, preferably 30 ° C. or more and 110 ° C. Since it is less than ° C., it is completely dissolved and the kinematic viscosity is lowered, so that it can penetrate into the metal contact portion together with the diamond particles and prevent the metal from being accidentally worn.

In addition, the concentration of the lubricating component in the dispersion solvent can be made small, and even if applied excessively, it does not cause stickiness and does not scatter or adhere to paper dust.
Furthermore, in the first embodiment, it takes the form of an aerosol, and further has a diameter of 1 cm.
Since spherical glass spheres, resin spheres, iron spheres and the like are contained, redispersion is easy even if diamond particle clusters partially aggregate inside the aerosol can.

Lubricant composition according to the second embodiment The lubricant composition according to the second embodiment of the present invention further includes an antiwear agent added to the lubricant composition of the first embodiment.
As the antiwear agent, zinc dithiophosphate obtained by reacting alcohol or phenol, phosphorus pentasulfide and zinc oxide (JP-A-10-45771, JP-A-11-32277).
Can be suitably used.

Since the lubricant composition according to the second embodiment is blended with the antiwear agent in this manner, the reaction film is decomposed at a low temperature on the metal surface in the boundary lubrication in the same manner as the lubricant composition according to the first embodiment. Form and improve lubricity.
Other additives such as organic molybdenum can also be used here, but they may produce solid lubricants after the reaction, and may corrode and alter metals, especially copper alloys. Since the effect may be hindered, it is necessary to determine whether it is contrary to the object of the present invention.

And since the lubricating film formed with the antiwear agent contains a semi-solid or solid oily improver, the effect of forming a liquid or semi-solid lubricating film and holding the diamond particle clusters on the lubricating surface There is. Due to the crystallinity of the semi-solid or solid oily improver, there is no oozing or excessive penetration like conventional oily lubricants.

In the second embodiment, generally, 0.01 to 1 to 1 to 5 parts by weight of oiliness improver.
Mixing 1 part by weight of diamond particle clusters and combining these parts,
Add 5-20 parts by weight of the first dispersion solvent. And 0.1 to 2 parts by weight of antiwear agent is added to 6 to 26 parts by weight of these, and 10 to 500 parts by weight of the second dispersion solvent is added to 16 to 28 parts by weight of these combined. . Further, when aerosolizing 16 to 528 parts by weight of these together, 16 to 528 parts by weight (stock solution) and propellant gas (LPG or DME) in a weight ratio, stock solution: spray gas = 7: 3 to 5: 5 It is best to adjust between.

More specifically, (1-5) :( 5-15) is suitable for the weight ratio of the combination of the solid oiliness improver and the diamond particle cluster to the first dispersion solvent. The weight ratio of the combination of the first dispersion solvent and the antiwear agent is (1-10) :( 10
100) is preferred. The total weight ratio of the anti-wear agent and the second dispersion solvent is:
(5-30): (70-95) is preferred.

In addition, in the lubricant composition of this Embodiment, another additive can be mix | blended unless it is contrary to the objective. For example, as a means for improving the dispersibility of the lubricant composition inside the aerosol can and the wettability (leveling property) during coating, a fluorosurfactant, an acetylene glycol surfactant, or an anionic surfactant 0.04 parts by weight per 100 parts by weight of the dispersion solvent.
1-1 weight part can be mix | blended.

3.3 g of a mixture of a fatty acid amide using a fatty acid having 18 carbon atoms and a monoglyceride using a fatty acid having 18 carbon atoms as an oiliness improver was blended, and a diamond particle cluster (average of Toyo Dry Lube Co., Ltd.) was used as a solid lubricant. 0.11 g of a particle size of about 15 nm) was blended. Further, as the first dispersion solvent, 17.8 g of a mixture of a fatty acid ester of caprylic acid and trimethylolpropane and a fatty acid ester of capric acid and trimethylolpropane has a kinematic viscosity at 40 ° C. of about 2000 mm ² / A mixture prepared by blending 3.4 g of the sulfur cross-linked ester polymer of s and 7 g of a mixture of triphenyl phosphate ester and triarylisopropyl phosphate ester was added. Furthermore, as a second dispersion solvent, 96 g of Isopar E (hydrocarbon organic solvent) manufactured by ExxonMobil Co., Ltd., which contains a plurality of hydrocarbon organic solvents having boiling points in the range of 110 to 140 ° C., sold in Japan alcohol What was prepared by blending 36 g of Solmix AP-7 (lower alcohol) manufactured by Co., Ltd. was added. And it aerosolized using 116g of 0.34Mpa and LPG as a filler.

A nail catch test was performed using the obtained aerosol lubricant.
This test was performed using parts actually used for a Mitsubishi printing press (claw shaft and claw holder and its peripheral parts) and setting the lubrication status to an actual machine of 18000 rpm / hour. The power used was an electric motor capable of reproducing the situation.

Test conditions:
Initial coating: The nail holder was loosened, moved sideways, applied to the nail shaft, and then the nail holder was returned to its original position and crimped.
Operating conditions: Continuous operation (however, the force required to apply the lubricant and move the claw shaft (kgf
) Stopped during measurement. ]
Rotational speed: 18,000 rpm / hour Slide amount: 1 mm (measured under the nail)
Application interval: No lubrication (however, if torque value is increased)
Application amount: Sprayed 0.5 seconds each from the caulked part of the nail holder and from the left and right.
Blank (no application from the beginning)

The coated surface was in the form of a thin film, and the touch with the finger was in a semi-dry state. There is no lubrication even after 2 months, the movement of the claw holder is smooth, and no increase in torque value is seen. Blank burns in 1 hour,
Although the conventional product was not burned out, bleeding and scattering from the nail plate were observed. After the test, the nail receiving metal part and the nail shaft surface were visually observed and observed with an LSM (scanning confocal laser microscope), but no corrosion or discoloration was observed.

3.3 g of a mixture of a fatty acid amide using a fatty acid having 18 carbon atoms as an oiliness improver and a monoglyceride using a fatty acid having 18 carbon atoms, and 1.7 g of zinc dithiophosphate as an antiwear agent
To this, 0.11 g of a diamond particle cluster (average particle size of about 15 nm) manufactured by Toyo Dry Lube Co., Ltd. was blended as a solid lubricant. Further, as the first dispersion solvent, 17.8 g of a mixture of a fatty acid ester of caprylic acid and trimethylolpropane and a fatty acid ester of capric acid and trimethylolpropane has a kinematic viscosity at 40 ° C. of about 2000 mm ² / A mixture prepared by blending 3.4 g of the sulfur cross-linked ester polymer of s and 7 g of a mixture of triphenyl phosphate ester and triarylisopropyl phosphate ester was added. Furthermore, as a second dispersion solvent, 96 g of Isopar E (hydrocarbon organic solvent) manufactured by ExxonMobil Co., Ltd., which contains a plurality of hydrocarbon organic solvents having boiling points in the range of 110 to 140 ° C., sold in Japan alcohol What was prepared by blending 36 g of Solmix AP-7 (lower alcohol) manufactured by Co., Ltd. was added. And 116 g of 0.
Aerosolization was performed using 34 Mpa and LPG.

Using the obtained aerosol lubricant, the nail receiving test described above was performed.
The coated surface was in the form of a thin film, and the touch with the finger was in a semi-dry state. There is no lubrication even after 2 months, the movement of the claw holder is smooth, and no increase in torque value is seen. Blank burns in 1 hour,
Although the conventional product was not burned out, bleeding and scattering from the nail plate were observed. After the test, the nail receiving metal part and the nail shaft surface were visually observed and observed with an LSM (scanning confocal laser microscope), but no corrosion or discoloration was observed.

The lubricant composition according to the present invention can be employed in sliding parts of printing machines, bookbinding machines, paper processing machines, and peripheral devices associated therewith.

Claims (2)

  Solid or semi-solid oiliness improver (excluding those that only show a liquid state when used in sliding parts and those that show a gas state when used in sliding parts) and amorphous A diamond particle cluster having an average particle diameter of 15 nm, which is an aggregate of diamond particles having an average particle diameter of 5 nm coated with carbon, is dispersed in a first dispersion solvent composed of a fatty acid ester, an organic sulfur compound, and a phosphate ester. A lubricant composition obtained by dispersing the resulting lubricant in a second dispersion solvent comprising a hydrocarbon-based organic solvent and a lower alcohol, and forming an aerosol.   Solid or semi-solid oiliness improver (excluding those that only show a liquid state when used in sliding parts and those that show a gas state when used in sliding parts) and amorphous A diamond particle cluster having an average particle diameter of 15 nm, which is an aggregate of diamond particles having an average particle diameter of 5 nm coated with carbon, is dispersed in a first dispersion solvent composed of a fatty acid ester, an organic sulfur compound, and a phosphate ester. The lubricant composition obtained by dispersing the lubricant and the antiwear agent in a second dispersion solvent composed of a hydrocarbon-based organic solvent and a lower alcohol and forming an aerosol.