JP5517232B2 - Storage method of flame retardant grease composition - Google Patents

Description

The present invention relates to a storage method for a flame retardant grease composition used in a sliding part of a mechanical device and a bearing that requires flame resistance, rust prevention, and load resistance in various industrial machines.

  In recent years, the demand for lubrication environment has been very strict in various facilities such as steel manufacturing facilities, and the grease composition for lubrication has various performances such as excellent rust prevention, extreme pressure, water resistance and heat resistance. It is requested. In various types of equipment such as iron making equipment, mechanical devices equipped with bearings using lubricating grease are installed. If the environment in which the machine is operated is a high-temperature environment such as a steelmaking facility, the grease will ignite if the high-temperature scale of the machine or processed material scatters on the grease leaked from the bearing of the machine. In some cases, a fire may occur. For these reasons, there is a demand for a lubricating grease having excellent performance as described above as a grease composition and having excellent flame retardancy that is difficult to ignite even when a high-temperature scale is mixed in the grease. .

  Conventionally, grease compositions using potassium or calcium oxides, carbonates, hydrogen carbonates, and sulfates as additives are known in order to add flame retardancy to grease compositions. The grease composition comprises a lubricating base oil, a thickener selected from lithium soap, calcium soap, sodium soap or mixtures thereof, and 1 to 7% by weight oxidation based on the grease composition. And a flame retardant additive of a mixture containing 1 to 7% by weight of a potassium compound based on a grease composition selected from calcium and potassium carbonate, potassium hydrogen carbonate and potassium sulfate (for example, patent literature) 1).

In addition, greases that are self-extinguishing after ignition are known. The self-extinguishing grease composition has a self-extinguishing property with a self-extinguishing time of 5 minutes or less in an ointment can combustion test, and the flash point of the liquid component of the grease composition is 270 ° C. or higher. The self-extinguishing grease composition described above is a lubricating grease composition having excellent flame retardancy that is difficult to ignite even when the accumulated lubricating grease composition is exposed to a high temperature or a high-temperature scale is scattered. It can be used for a scale-intensive lubrication system (see, for example, Patent Document 2).
Japanese Patent No. 2999953 JP 2004-67843 A

  However, with conventional grease compositions, in order to make the grease difficult to ignite, a powder additive such as potassium carbonate is added to the grease, so that plugging occurs in piping in the centralized lubrication system. There was a fear. In addition, in sliding bearings, wear of parts was accelerated by the additive powder, which could shorten the equipment life. In addition, even self-extinguishing lubricating grease does not have sufficient self-extinguishing properties and cannot prevent ignition. In particular, the addition of an extreme pressure additive or the like to provide extreme pressure properties makes it easier to ignite. there were.

  Furthermore, the grease having some of the excellent performances as described above has a problem in flame retardancy when hot scales are scattered in steelmaking facilities. That is, grease with excellent flame retardancy or self-extinguishing properties cannot satisfy various performances such as rust prevention, extreme pressure, water resistance, and heat resistance. The flame retardancy when hot scales are scattered cannot be satisfied.

The object of the present invention is to solve the above-mentioned problems, and even when used in various industrial equipment applications, it can exhibit particularly flame retardancy among various performances. For example, when used in steelmaking equipment, etc. Even when heated scales are scattered, they can exhibit flame retardancy that is difficult to be ignited by a fire type such as the scale. In order to exhibit flame retardancy, a calcium sulfonate complex is used as a thickener. It is an object of the present invention to provide a method for storing a grease composition excellent in flame retardancy, characterized in that oil is mixed with water.

The present invention, formulations mineral oils, synthetic hydrocarbon oils, ether oils, esters, the thickener is calcium sulphonate complex soap mixture consisting of base oil and water comprising at least one selected from glycols The flame retardant grease composition is a storage method for a flame retardant grease composition, wherein the water content in the grease comprising the base oil and the thickener is 10 wt% to 60 wt%. When an object is stored in a drum can, a pail can, or a container of a greasing tank, in order to suppress the evaporation of the water, the exposed surface where the flame retardant grease composition in the container comes into contact with air is lubricated. And / or a method for storing a flame retardant grease composition, which is covered with a plate or film made of a resin material and sealed .

The method for storing a flame retardant grease composition according to the present invention is configured as described above, and since the exposed surface of the grease is covered and sealed with a plate or film made of a lubricating oil and / or resin material. The water mixed and mixed in is prevented from evaporating from the grease, and the flame retardancy can be maintained for a long time.

In addition, this flame-retardant grease composition has excellent flame retardancy, so it was installed in mechanical equipment with severe lubrication environments, for example, steelmaking equipment installed in severe working environments in which high-temperature scales are scattered. It can be applied to bearings incorporated in sliding parts and rotating parts, and even if high-temperature substances such as high-temperature scales enter or enter the lubricating grease, it is difficult for the grease to ignite. Can be improved. Furthermore, this flame retardant grease composition can be made into a property having excellent low temperature performance and excellent flame resistance by using a base oil having good low temperature performance. In addition, this flame retardant grease composition can substantially reduce the amount of grease used and has environmentally friendly characteristics.

The method of storing a flame retardant grease composition according to the present invention solves the above-mentioned problems of the prior art, and is particularly excellent in flame retardancy by containing water. Further, if necessary, an oxidizing agent can be used as an additive. It can be applied to any additive to which inhibitors, rust inhibitors, extreme pressure agents, thickeners, pour point depressants, preservatives, or antifoaming agents are added as appropriate. , It can be adapted to those having water resistance and heat resistance.

  This flame retardant grease composition is mainly characterized in that a thickener is blended in a mixture of a base oil and water. In particular, as the base oil, mineral oil, synthetic hydrocarbon oil, diphenyl ether oil, What consists of at least 1 sort (s) selected from ester and glycols is used, Furthermore, calcium sulfonate complex soap is used as said thickener. Specifically, the water content is adjusted to 10 to 60% by weight based on the grease composed of the base oil and the thickener. This flame retardant grease composition has sufficient performance for industrial equipment applications by using a mixture of base oil and water, and in particular, a grease composition that is excellent in flame retardancy by containing water. Can be.

Also, the storage method of the flame retardant grease composition according to the invention, drums, when stored in a container pail, or Kyuaburatan click, the exposed surface of the grease touching its air, for example, lubricating oil an upper surface By covering and sealing with and / or sealing with a plate or film made of a resin material, evaporation of water from the flame-retardant grease can be suppressed, and flame retardancy can be maintained over a long period of time.

With respect to this flame retardant grease composition, samples of Examples 1 to 8 were prepared, and these flame retardant tests were performed. The base oil A, which is a mineral oil with a kinematic viscosity of 10.2 mm ² / s at 100 ° C., was used as the base oil, and the calcium sulfonate complex soap was used as the thickener. .
In Example 1, Sample 1 was prepared by mixing base oil A: 65.0% by weight, thickener: 30.0% by weight, and water: 5.0% by weight. Sample 1 had a blending degree of 334.
In Example 2, Sample 2 was prepared by mixing base oil A: 61.0% by weight, thickener: 29.0% by weight, and water: 10.0% by weight. Sample 2 had a miscibility of 330.
In Example 3, Sample 3 was prepared by mixing base oil A: 48.0% by weight, thickener: 22.0% by weight, and water: 30.0% by weight. Sample 3 had a penetration of 323.
In Example 4, Sample 4 was prepared by mixing base oil A: 35.0% by weight, thickener: 15.0% by weight, and water: 50.0% by weight. Sample 4 had a penetration degree of 312.
In Example 5, Sample 5 was prepared by mixing base oil A: 27.0% by weight, thickener: 13.0% by weight, and water: 60.0% by weight. Sample 5 had a blending degree of 315.
In Example 6, Sample 6 was prepared by mixing base oil A: 15.0% by weight, thickener: 15.0% by weight, and water: 70.0% by weight. Sample 6 was not greased because the water content in the grease was too high.
In Example 7, Sample 7 was prepared by mixing base oil A: 55.0% by weight, thickener: 15.0% by weight, and water: 30.0% by weight. Sample 7 had a blending degree of 371.
In Example 8, Sample 8 was prepared by mixing base oil A: 40.0% by weight, thickener: 30.0% by weight, and water: 30.0% by weight. Sample 8 had a penetration degree of 274.

Samples 1 to 8 were subjected to a flame retardancy evaluation test. The flame retardant evaluation method is shown below.
The grease compositions of Sample 1 to Sample 8 are placed in crucibles having an inner diameter of 40 mm and a depth of 36 mm, respectively, and a rectangular parallelepiped having a size of 10 mm in length, 15 mm in width, and 10 mm in height as a high-temperature scale is preliminarily 1000 ° C. The high-temperature rectangular parallelepiped iron piece was placed in a crucible containing the grease composition, and the presence or absence of ignition of the grease composition was confirmed.
The flame retardancy evaluation tests of Examples 1 to 8 are shown in Table 1.

As can be seen from Table 1, in Sample 1 of Example 1, the content of water with respect to the grease was 5.0% by weight, and the content of water was too small, so that Sample 1 ignited. In addition, each of the samples 2 to 5 of Examples 2 to 5 is all greased, and the water content is 10% to 60.0% by weight. Samples 2 to 5 are not ignited and difficult. It turns out that it is rich in flammability. In sample 6 of Example 6, the water content with respect to the grease was 70.0% by weight and could not be made into grease, so the ignition test was not performed.
In Examples 7 and 8, the water content in the grease is 30.0% by weight, in Example 7, the thickener is 15.0% by weight, and in Example 8, the thickener is 30%. It was found that Sample 7 and Sample 8 were not ignited and rich in flame retardancy.
As described above, from the flame retardancy test results of Examples 1 to 8, the blending ratio of the base oil and the thickener differs in the blending degree, but does not affect the flame retardancy and is difficult. The degree of flammability was found to be affected by the water content in the grease. As can be seen from Table 1, the amount of water in the grease consisting of the base oil and the thickener is in the range of 10.0% to 60.0% by weight and can exhibit flame retardancy. I understood.

Next, Sample 9 to Sample 14 of Example 9 to Example 14 were prepared, and these flame retardancy tests were performed. In Samples 9 to 14, calcium sulfonate complex soap was used as a thickener, and different base oils A to G were used as base oils, and the blending amount of the thickener was changed. In Samples 9 to 11, the water content was 30.0% by weight, and in Samples 12 to 14, the water content was 50.0% by weight.
In Example 9, Sample 9 was prepared by mixing base oil B: 45.0% by weight, thickener: 25.0% by weight, and water: 30.0% by weight. Sample 9 had a penetration degree of 333.
In Example 10, Sample 10 was prepared by mixing base oil C: 42.0% by weight, thickener: 28.0% by weight, and water: 30.0% by weight. The blending degree of Sample 10 was 339. In Example 11, Sample 11 was prepared by mixing Base Oil A: 45.0 wt%, Base Oil D: 5.0 wt%, Thickener: 20.0 wt%, and Water: 30.0 wt%. did. The blending degree of Sample 11 was 320.
In Example 12, Sample 12 was prepared by mixing base oil E: 38.0% by weight, thickener: 12.0% by weight, and water: 50.0% by weight. Sample 12 had a penetration degree of 305. In Example 13, Sample 13 was prepared by mixing base oil F: 36.0% by weight, thickener: 14.0% by weight, and water: 50.0% by weight. Sample 13 had a blending degree of 311. In Example 14, Sample 14 was prepared by mixing base oil G: 33.0% by weight, thickener: 17.0% by weight, and water: 50.0% by weight. Sample 14 had a penetration of 301.

Base oil A: mineral oil, kinematic viscosity at 100 ° C. 10.2 mm ² / s
Base oil B: mineral oil, kinematic viscosity at 100 ° C. 29.8 mm ² / s
Base oil C: synthetic hydrocarbon, kinematic viscosity at 100 ° C. 4.8 mm ² / s
Base oil D: Ethylene glycol Base oil E: Polyalkylene glycol, kinematic viscosity at 100 ° C. 20.2 mm ² / s
Base oil F: alkyl diphenyl ether, kinematic viscosity at 100 ° C. 11.8 mm ² / s
Base oil G: polyol ester, kinematic viscosity at 100 ° C. 10.0 mm ² / s

Samples 9 to 14 were subjected to a flame retardancy evaluation test. The flame retardant evaluation method is shown below. Similarly to the flame retardancy evaluation method of Sample 1 to Sample 8, the grease compositions of Sample 9 to Sample 14 were put in the same crucible as above, and the above high-temperature rectangular parallelepiped iron pieces were put into the grease composition. It was placed in a crucible and the presence or absence of ignition of the grease composition at this time was confirmed.
Table 2 shows the flame retardancy evaluation tests of Examples 9 to 14.

  As can be seen from Table 2, for any of the base oil A to the base oil G, the content of water with respect to the grease is 30.0 within a predetermined range, that is, within a range of 10.0 wt% to 60.0 wt%. Since it was 5% by weight and 50.0% by weight, it was found that it was a requirement to exhibit flame retardancy. The mixing ratio of the thickener to the base oil is different in the blending degree, but it does not affect the flame retardancy performance. It was. Therefore, this flame retardant grease composition can be used by adjusting the blending ratio of the thickener according to the application and adapting to the application.

In order to compare the flame retardancy characteristics of Examples 1 to 14, it was difficult to use Comparative Examples 1 and 2 and commercially available flame retardant greases A to D in which water was not mixed with the grease. A flammability evaluation test was conducted.
Comparative Example 1 and Comparative Example 2 contain 40.0% by weight of calcium sulfonate complex soap as a thickener, Comparative Example 1 is 60.0% by weight of base oil A, and Comparative Example 2 is base oil B. 60.0% by weight was used.
Commercially available flame retardant greases A, B and C use lithium soap as a thickener, and commercially available flame retardant grease D uses aluminum soap as a thickener.
Table 3 shows the flame retardancy evaluation tests of Comparative Examples 1 and 2 and commercially available flame retardant greases A to D.

  As can be seen from Table 3, Comparative Examples 1 and 2 and the commercially available flame retardant greases A to D were all ignited and found to have no flame retardancy. It was found that this flame retardant grease composition improves the flame retardancy by mixing a predetermined amount of water with the grease. It can also be seen that this flame retardant grease composition may be prepared according to the application using the water content in the grease and the blending amount of the thickener in the base oil. This flame-retardant grease composition is difficult to ignite even when high-temperature substances are scattered in the lubricating grease, and can improve the safety of the work site. In addition, this flame retardant grease composition can substantially reduce the amount of grease used and is environmentally friendly.

Further, the flame retardant grease composition This, drums, when simply placed in storage in a container pail, or Kyuaburatan click, the shape of the container and lid for use, or an environment that put the container is at a high temperature by Coto like, mixed water evaporates into the grease was found that you can not maintain the properties of the flame retardant. Therefore, the storage method of the flame retardant grease composition according to the present invention prevents the evaporation of water in the flame retardant grease by covering and sealing the air contact surface of the flame retardant grease composition contained in a container. It was found that flame retardancy can be maintained. Therefore, the flame retardant grease composition, when stored, the exposed surface of the flame-retardant greases touch with air, for example, sealed over the top surface with a lubricating oil, and / or a plate or film made of a resin material It was found that by covering and sealing, evaporation of water from the flame retardant grease can be suppressed, and the flame retardancy of the flame retardant grease can be maintained over a long period of time.

The method of storing a flame retardant grease composition according to the present invention is applicable to various equipment, industrial machines, vehicles such as automobiles and freight cars, home appliances, etc., particularly for rust prevention, extreme pressure, water resistance and heat resistance. It is preferably applied to store a flame retardant grease composition containing water for use in bearings or sliding parts that require flammability.

Claims (1)

Mineral oil, synthetic hydrocarbon oil, ether oil, ester, flame retardant blended thickener is calcium sulphonate complex soap mixture consisting of base oil and water comprising at least one selected from glycols A method of storing a grease composition, wherein the flame retardant grease composition in which the water content in the grease comprising the base oil and the thickener is blended in an amount of 10 wt% to 60 wt% is added to a drum can In order to suppress the evaporation of the water when stored in a container of a can, a pail can or a greasing tank, the exposed surface where the flame retardant grease composition in the container comes into contact with air is lubricated with oil and / or resin. A method for storing a flame retardant grease composition, which is covered with a plate or film made of a material and sealed .