JP2013241368A - Platinum aqueous solution and water soluble cutting liquid cleaning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a low-priced cleaning apparatus utilizing the high antibacterial properties and high deodorant properties of platinum nanoparticles.SOLUTION: The drip of a platinum aqueous solution with high antibacterial properties and deodorant properties obtained by diluting the undiluted solution of a platinum aqueous solution in which platinum nanoparticles are dissolved with water of 1L with water of a volume in any magnification of 400 times, 800 times and 1,500 times is stuck to the surface of ceramic balls 3. The high antibacterial properties and deodorant properties of the platinum nanoparticles dissolved into the platinum aqueous solution are utilized. The water soluble cutting liquid as the cooling water of a cutting machine septic in a storage tank 1 successively passes through a nonwoven filter 6 and a porous filter 5, is filtered, and is thereafter allowed to flow into the ceramic ball layer 3. The platinum nanoparticles dissolved into the platinum aqueous solution stuck in a drip shape to the respective surfaces of many ceramic balls 4 shut off an odor source and kill bacteria or the like by the exhibition of the antibacterial performance and deodorant performance thereof. The aqueous cutting liquid returned under circulation is cleaned to the respective steps.

Description

The present invention provides a platinum nanoparticle solution (hereinafter referred to as a “platinum aqueous solution”) that exhibits antibacterial and antibacterial performance and can be reduced in cost, and a cutting machine (lathe, milling machine, drilling machine, etc.) that uses the platinum aqueous solution. The present invention relates to an apparatus for purifying water-soluble cutting fluid.

  In a cutting machine used in a conventional machine factory, cutting oil is used to cool heat generated between a cutting tool such as a cutting tool and a metal to be cut during operation.

US Pat. No. 6,239,064

  In recent cutting machines, from the viewpoint of further improving the production efficiency and further reducing the machining cost of the workpiece, a chuck (rotating mechanism) that supports and rotates the workpiece as in a lathe. ), Or the rotational speed of a rotating mechanism that rotates while supporting a cutting tool, such as a milling machine, is set to an extremely high value.

For this reason, extremely high-temperature heat is generated in the cutting part due to contact between the workpiece and the cutting tool, and simply flowing the conventional cutting oil through the cutting part suppresses the high heat generated during the machining operation and The cutting part of the workpiece cannot be cooled. As a result, the workpiece at the time of finishing the processing is extremely thermally expanded, and the dimension of the workpiece at that time is the same as the normal temperature due to the shrinkage effect generated in the subsequent cooling process by air. This greatly differs from the dimensions of the workpiece to be cut.

  In order to avoid such processing size wrinkles, water (water-soluble cutting fluid) is used as a coolant in place of oil in current cutting machines.

  However, the constant flow of cooling water during cutting work requires a large amount of cooling water to be used during cutting work. From the viewpoint of reducing work costs, The cooling water used in the tank is circulated through a water-soluble cutting fluid storage tank installed in the machine factory, and the storage tank is cleaned and replaced throughout the storage tank. It does n’t go.

Therefore, due to the decay or precipitation of cooling water, the odor source particles that give off malodorous drift in the air in the machine factory enter the cooling water, and the odorous particles are absorbed into the indoor air humidity and room temperature. It grows according to the working environment.

Furthermore, bacteria that are harmful to the human body, such as yellow staphylococci or bacteria that are odorous in the air, can invade and grow in the cooling water.

Due to the existence of various odor sources that emit such bad odors and the presence of bacteria that harm human health, abnormal odors are constantly generated in machine factories that use cutting machines. . If the worker inhales such a bad odor at all times or bathes cooling water containing bacteria on a part of the body, the operability of the worker is deteriorated or the health of the worker's body is impaired. The environmental problem of obtaining has arisen.

  The present invention has been made to improve the current state of the working environment in the field of such cutting work. Its main purpose is to effectively remove, kill, and reduce various odor sources and bacteria from the water-soluble cutting fluid for cooling during cutting, thereby purifying the air in the machine factory and improving the environment. It is in point to plan.

A water-soluble cutting fluid purifying apparatus according to the subject of the present invention is a solution of a platinum aqueous solution containing platinum nanoparticles having a particle size of nano-size dissolved in 1 liter of water and having a volume of water up to 1500 times. The water-soluble cutting in a storage tank storing a water-soluble cutting fluid used in a machine factory by a ceramic ball layer in which a plurality of ceramic balls having a surface to which a drip of a platinum aqueous solution diluted by an aqueous solution is attached It is characterized by purifying the liquid.

  According to the subject matter of the present invention, a low-cost platinum aqueous solution that can exhibit the high antibacterial / disinfecting performance of platinum nanoparticles at a similar level after dilution with water (purified water or pure) is used. By applying it to the purification device, it is possible to dissipate abnormal malodors in the cutting work place (machine factory) and to kill harmful bacteria in the water-soluble cutting fluid.

In this case, the adhesion of platinum nanoparticles to the surface of the ceramic ball is realized using a low-cost platinum aqueous solution obtained by diluting the stock solution with water such as purified water, so cutting is relatively inexpensive. It is possible to provide a purification device that can improve the environment of the processing workshop.

  Hereinafter, various embodiments of the present invention will be described in detail along with the effects and advantages thereof with reference to the accompanying drawings.

It is a figure which shows typically the process of diluting the stock solution of platinum aqueous solution with water (purified water etc.). It is a figure which shows typically the structure of the purification apparatus of the water-soluble cutting fluid which applied the platinum aqueous solution which concerns on Embodiment 1. FIG.

  (Embodiment 1)

  <Development of low-priced platinum aqueous solution (platinum nanoparticle solution)>

  Nano-sized platinum particles (hereinafter referred to as “platinum nanoparticles”) are noble metal particles that exhibit antibacterial and antiviral properties with extremely high killing ability. There is a demand for the realization of an inexpensive aqueous solution (platinum nanoparticle aqueous solution) in which platinum nanoparticles are dissolved that can exhibit the antibacterial and antiviral properties of the platinum nanoparticles.

  An aqueous solution (platinum nanoparticle aqueous solution) containing platinum nanoparticles dissolved in 1 liter of water (purified water or pure water, etc.) that can continuously exhibit the above-mentioned high antibacterial / deodorant performance over time. Is a commodity available from the market. Hereinafter, the “platinum aqueous solution” dissolved in 1 liter of purified water or the like is referred to as “platinum aqueous solution”.

The “platinum solution stock solution” that can be purchased from the above market exhibits antibacterial properties against bacteria such as Escherichia coli, and is also antiviral against various viruses such as norovirus, avian influenza virus, thirs virus or AIDS virus. It is demonstrated by the test results that it also exerts sex. In addition, it has been proved by tests that the stock solution of the present platinum aqueous solution can also exhibit deodorizing properties against ammonia and the like.

However, platinum is a rare noble metal to use this “platinum aqueous solution” as it is to realize an air purifier or humidifier or an air purifier with a humidifier. Since it is expensive, there is a problem that the cost of the stock solution of the platinum aqueous solution increases. That is, as the platinum aqueous solution used in the filter of the air cleaner described in the second embodiment to be described later, the above platinum aqueous solution is used every time the filter is replaced at the replacement time. When the stock solution is used and it is examined from the viewpoint of practical use, it is not suitable for practical use in terms of cost.

  Therefore, as schematically shown in FIG. 1, the inventor of the present application further adds the above-mentioned water HL to a stock solution OPL of a platinum aqueous solution obtained by dissolving platinum nanoparticles with 1 liter of water (purified water or pure water). Is diluted by dissolving platinum nanoparticles with x (x> 1) liters of water by diluting the stock solution OPL to further reduce the concentration value of platinum dissolved in the aqueous solution. A platinum aqueous solution PSL was prepared. And if the antibacterial and deodorant properties of the platinum aqueous solution PSL diluted x-fold with respect to the stock solution OPL are set to any value of x, even after the stock solution OPL is diluted regardless of the passage of time It was tested whether it was kept.

  Tables 1 and 2 below show the results of the antibacterial test of platinum aqueous solution PSL having a value of x of 400, that is, diluted with water 400 times that of stock solution OPL.

  The antibacterial test is a test conducted by the present inventor submitting the platinum aqueous solution PSL and entrusting the antibacterial test to the general incorporated foundation, Boken Quality Evaluation Organization. And the test method applies JIS1902: 2008 quantitative test (bacterial liquid absorption method) mutatis mutandis, and the measuring method of the number of viable bacteria depends on the pour plate culture method. In addition, the test method in each antibacterial test and the method for measuring the number of viable bacteria are the same as described above. The test strain in the antibacterial test shown in Table 1 and Table 2 is MRSA (methicillin resistant Staphylococcus aureus) known as a nosocomial pathogen.

  As shown in Table 1, on the standard cotton fabric to be compared in the test, MRSA bacteria grew as indicated by the growth value 2.6 after 18 hours from the inoculation. Yes. In contrast, Table 2 shows that after a platinum aqueous solution of 0.4 g collected from a platinum aqueous solution PSL diluted 400 times with respect to the stock solution OPL was soaked in a cotton cloth to be tested, It is a measurement result in case 0.2 ml of MRSA bacterial solution is inoculated on the cotton cloth.

As shown in the results of Table 2, the common logarithm of the number of MRSA inhabiting on cotton cloth 18 hours after the inoculation of MRSA is 1.3 or less, which is compared with the case of Table 1. And it is confirmed that the number of viable bacteria is decreasing at each stage. According to the criteria defined in the JIS standard, the “bacteriostatic activity value” displayed in Table 2 is used to determine whether the liquid sample to be tested has “antibacterial” properties. If the “bacteriostatic activity value” is 2.0 or more, it is judged to be “passing antibacterial”. In the test of Table 2, the “bacteriostatic activity value” is a value of 5.7 or more, far exceeding 2.0, which is a threshold for determination of acceptance.

Therefore, even if the present inventors adopted a platinum aqueous solution PSL having a dilution of 400 times adopted as the value x times that in FIG. 1, the platinum aqueous solution PSL has sufficient antibacterial properties against MRSA bacteria. It has been proved from the test results.

This is because the platinum aqueous solution PSL diluted at a 400-fold dilution with respect to the stock solution OPL eliminates MRSA, which is known as a cause of nosocomial infection, in the hospital, and is therefore a low feasible amount. It means that it can be applied as a cost antibacterial agent.

  In addition, the inventor of the present application has reported that the platinum aqueous solution PSL diluted with the 400-fold dilution described above has a performance (antibacterial property) against “Staphylococcus aureus” (Bacteria). The performance test was commissioned. The test results are the results shown in Table 3 and Table 4 below. As is known, “Staphylococcus aureus” is a causative bacterium of epidermic infection or food poisoning, or an infectious disease such as pneumonia, meningitis, and sepsis.

In this antibacterial test, as in the case of the antibacterial test of Tables 1 and 2, 0.4 g of platinum aqueous solution was collected from the above platinum aqueous solution PSL, and 0.2 ml of “Staphylococcus aureus” Is inoculated on the cotton cloth to be tested.

If the test results in Table 4 are referred to in comparison with the results in Table 3, as a clear result, the platinum aqueous solution PSL diluted with 400 times water is still effective against “Staphylococcus aureus”. It is understood that it has “sex”. In Table 4, as in the case of Table 2, the “bacteriostatic activity value” is 5.9 or more, and the “antibacterial activity” of the platinum aqueous solution PSL diluted with 400 times water is sufficiently acceptable. It is determined that

Furthermore, the inventor of the present application has said that the platinum aqueous solution PSL diluted with the 400-fold dilution described above is “antibacterial” against “Bacteria pneumoniae (Klebsiella pneumoniae)”. We commissioned a test to determine whether or not The test results are the results shown in Table 5 and Table 6 below. As is known, “Klebsiella pneumoniae” is an attenuated bacterium that causes respiratory infections, urinary tract infections, and the like.

Also in the antibacterial test, as in the case of the antibacterial test of Tables 1 and 2, 0.4 g of platinum aqueous solution was collected from the above platinum aqueous solution PSL, and 0.2 ml of “Klebsiella pneumoniae” Is inoculated on the cotton cloth to be tested.

If the test results in Table 6 are referred to in comparison with the results in Table 5, the common logarithm of the number of viable bacteria after 18 hours is markedly reduced to 1.3 or less, and “bacteriostatic activity value” As for "", a value that is 6.4 or higher and sufficiently high to make a pass determination is detected. Therefore, it is understood that the platinum aqueous solution PSL diluted at a dilution of 400 times described above has sufficient “antibacterial activity” against “Klebsiella pneumoniae”.

The platinum aqueous solution PSL diluted at a dilution of 400 times can exhibit relatively high deodorizing performance with respect to particles that cause malodor such as ammonia, acetic acid, or isovaleric acid.

  According to the above test results, when the dilution of the platinum aqueous solution with water (purified water, pure, etc.) is 400 times, the “bacteriostatic activity value” is sufficiently higher than the threshold value 2.0 for the pass judgment. The platinum aqueous solution diluted with the dilution of 400 times still has high “antibacterial performance”. Further, a platinum aqueous solution diluted with 400 times water (purified water, pure, etc.) also exhibits sufficiently high “deodorizing performance”.

If so, a platinum aqueous solution diluted 400 times with respect to a platinum aqueous solution in which platinum nanoparticles are dissolved in 1 liter of water has a relatively high antibacterial property. I can say that. Or it is thought that the platinum aqueous solution diluted with the dilution within the range within 400 times (for example, 200 times, 300 times) has relatively high “antibacterial properties”. Moreover, it is thought that the platinum aqueous solution diluted with the dilution within the range of 400 times or more also has “deodorizing performance”.

  Here, Table 7 below shows the antibacterial performance of the platinum aqueous solution PSL diluted and diluted by 400 times with respect to the platinum aqueous solution OPL developed and put into practical use by the present inventors, and the products of each company. It is a test result which shows a comparison result. The strain used for the test is Staphylococcus aureus, and the method of the antibacterial test is the same as the test method described in Tables 1 and 2. The common logarithm of the number of viable bacteria on the standard cotton cloth is 4.4 immediately after inoculation with the test strain, 7.2 after 18 hours, and the growth value is 2.8. is there. The comparative test was also commissioned to the Boken Quality Evaluation Organization.

  In Table 7, sample (1) is a fine particle ion generated from moisture in the air, developed by Company A, and is one sterilization method in an air cleaner (releases fine ions in the air. And a method for decomposing and removing airborne viruses.) Sample (2) is an ion developed by company B and, like sample (1), is applied to the ion used in the sterilization method in the air cleaner. Sample (3) is a product for a deodorizer from Company C. Sample (4) is a dough naturally dried after being immersed in the diluted platinum aqueous solution developed by the inventors of the present application.

  As shown in Table 7, the values of the “bacteriostatic activity value” of each of the samples (1), (2) and (3) are 0.3, 0.3 and 0.2, which are low values across the board. On the other hand, the “bacteriostatic activity value” of the sample (4) is 5.0, which is a prominent high value compared to the values of the other samples (1), (2) and (3). ing.

As is clear from the results of this comparative test, it is understood that the platinum aqueous solution PSL diluted at a dilution of 400 times the stock solution OPL has extremely high antibacterial performance. In addition, the platinum aqueous solution PSL is an aqueous solution obtained by diluting a stock solution OPL obtained by dissolving platinum as nano-sized particles with 1 liter of water with 400 times the volume of water. The point that the cost can be reduced while maintaining a certain level of antibacterial performance is extremely effective and useful from the viewpoint of practical application.

The “bactericidal activity value” and “bacteriostatic activity value” shown in the above Tables 2, 4, 6, and 7 are calculated by the following equations. That is, “bactericidal activity value” = Ma−Mc, “bacteriostatic activity value” = (Mb−Ma) − (Mc−Mo). Here, Ma is the common logarithm of the number of viable bacteria immediately after inoculation of the test strain on the standard cotton cloth, and Mb is the viable bacteria after 18 hours have passed since the inoculation of the test strain on the standard cotton cloth. It is the common logarithm of numbers. In contrast, Mo is a common logarithm of the number of viable bacteria immediately after inoculation of the test strain to the test sample, and Mc is 18 hours after the inoculation of the test strain to the test sample. It is a common logarithm of the number of viable bacteria. This also applies to Table 10 described later.

Furthermore, in order to reduce the cost of a further platinum aqueous solution, the inventor of the present application is diluted with water that is 800 times the value of x, which is twice 400, that is, 800 times that of the stock solution OPL. A platinum aqueous solution PSL was prepared, and its extinction test was performed. The breathability test was also commissioned to the Boken Quality Evaluation Organization. The test results are shown in Table 8 below.

  The test method and conditions in this respiration performance test are based on the application of the renewal processed fiber product certification standard of the Fiber Evaluation Technology Council. Regarding the initial gas concentration in the present performance test, ammonia is 1000 ppm (10 ml), acetic acid is 50 ppm (10 ml), and isovaleric acid is about 38 ppm (10 ml). The measurement time is 2 hours after the start of the test. In addition, the result whose deodorizing effect reduction rate is 75% or more is a pass result.

  When Table 8 is taken into consideration, the reduction rates of ammonia, acetic acid, and isovaleric acid are reported to be 87%, 98%, and 99% or more, respectively. From these results, it was confirmed that the platinum aqueous solution PSL diluted with water 800 times that of the stock solution OPL still maintains a sufficient “dissipation performance” that is not inferior to the stock solution OPL. It was.

Furthermore, in order to further reduce the cost of the platinum aqueous solution, the inventor of the present application creates a platinum aqueous solution PSL in which the value of x is diluted 1500 times, that is, diluted with water 1500 times that of the stock solution OPL. Then, the antibacterial performance test was conducted. The antibacterial performance test was also commissioned to the Boken Quality Evaluation Organization. The test results are shown in Table 9 and Table 10 below.

The antibacterial performance test is a test for determining whether or not the platinum aqueous solution PSL diluted by a factor of 1500 with respect to the stock solution OPL exhibits "antibacterial activity" against "S. aureus". Tables 1 and 2 As in the case of the antibacterial property test, 0.4 g of platinum aqueous solution was collected from the above platinum aqueous solution PSL, and 0.2 ml of “S. aureus” bacterial solution was inoculated on the cotton cloth to be tested. . If the test result of Table 9 is referred to in comparison with the result of Table 8, the common logarithm of the viable cell count after 18 hours is 1.3 or less, and it is markedly reduced as in Table 2. In addition, the “bacteriostatic activity value” is a result value of 5.9 or more, and this value is sufficiently high to make a pass determination of “antibacterial”. Therefore, it is understood that the platinum aqueous solution PSL diluted to a dilution of 1500 times still has sufficient “antibacterial performance” against “S. aureus”.

Furthermore, the inventor of the present application also conducted an extinction test on a platinum aqueous solution PSL that was diluted with water 1500 times as much as the stock solution OPL. The breathability test was also commissioned to the Boken Quality Evaluation Organization. The test results are shown in Table 11 below.

  The test method and conditions in this respiration performance test are based on the application of the renewal processed fiber product certification standard of the Fiber Evaluation Technology Council. Regarding the initial gas concentration in the present performance test, ammonia is 1000 ppm (10 ml), acetic acid is 50 ppm (10 ml), and isovaleric acid is about 38 ppm (10 ml). The measurement time is 2 hours after the start of the test. As in the case of the 800-fold dilution, the result that the deodorizing effect reduction rate is 75% or more is a pass result.

  Taking Table 11 into consideration, the respective reduction rates of ammonia, acetic acid and isovaleric acid are reported to be 88%, 99% or more and 99% or more, respectively. From these results, it is found that the platinum aqueous solution PSL diluted with 1500 times the volume of water with respect to the stock solution OPL still maintains sufficient “dissipation performance” that cannot be inferior to the stock solution OPL. ,confirmed.

  According to each test result above, when the dilution of the platinum aqueous solution with water (purified water, pure, sterilized ion-exchanged water, etc.) is 400 times or 1500 times, the “bacteriostatic activity value” is determined to be acceptable. The platinum aqueous solution which is sufficiently higher than the threshold value 2.0 of the above and diluted with a dilution of 400 times or 1500 times still has high “antibacterial performance”. Further, an aqueous platinum solution diluted with 800 times or 1500 times water (purified water, pure, sterilized ion-exchanged water, etc.) exhibits sufficiently high “dissipating performance”. If so, an aqueous platinum solution diluted 400-fold, 800-fold, or 1500-fold with respect to a stock solution of an aqueous platinum solution in which platinum nanoparticles are dissolved in 1 liter of water is relatively high. It can be said that it has antibacterial properties and antiseptic performance. Alternatively, it was confirmed that platinum aqueous solutions diluted at 400-fold and 1500-fold dilutions had high “antibacterial performance”, and were diluted at dilutions within the range of up to 1500-fold. It is thought that an aqueous platinum solution has a relatively high “antibacterial property”. From the same point of view, it is considered that an aqueous platinum solution diluted with a dilution within the range of up to 1500 times also has a relatively high “quiet performance”.

  From the above, the inventor of the present application, from the “pure solution of platinum nanoparticle aqueous solution” having antibacterial properties, deodorant properties, and antiviral properties, from the level of practicality while still retaining various performances of the stock solution. As a result, it was possible to develop and realize a diluted platinum aqueous solution that can reduce costs at each stage. The significance of this point is found in that it can be applied to a purification apparatus for water-soluble cutting fluid, which is a use invention described in the second embodiment below.

(Embodiment 2)
<Application invention: Purifier for water-soluble cutting fluid>

  FIG. 2 is diluted with water (purified water, etc.) at a dilution of 400 times, 800 times, or 1500 times with respect to the stock solution OPL of FIG. 1, or at a dilution up to 1500 times. It is a figure which shows typically the structure of the purification apparatus 2 at the time of applying the platinum aqueous solution PSL to purification of cooling water. In addition, the hatching display in FIG. 2 is for convenience, and does not indicate a longitudinal section.

  In FIG. 2, the water-soluble cutting fluid used as the cooling water during the cutting operation of the cutting machine is stored in the storage tank 1 installed in the machine factory.

  The purification device 2 in FIG. 2 is connected to the storage tank 1 via a pipe PA, and the water-soluble cutting fluid in the storage tank 1 flows into the purification device 2 by opening the valve of the pipe PA.

  The purification device 2 includes a nonwoven fabric filter 6, a porous filter 5 made of polyurethane, and a ceramic ball layer 3 sequentially from the storage tank 1 side.

  The nonwoven fabric filter 6 filters large impurities that are not filtered by a “filtering device” currently installed in the storage tank 1.

  The porous filter 5 is a filter that removes bacteria and ultrafine precipitates lurking in the water-soluble cutting fluid.

  Further, the ceramic ball layer 3 that forms the core of the purification device 2 has a large number of ceramic balls 4. On the surface of each of these ceramic balls 4, the drip of the platinum aqueous solution PSL diluted with water described in the first embodiment is attached. Therefore, when a water-soluble cutting fluid flows into the ceramic ball layer 3, the platinum nanoparticles dissolved in the platinum aqueous solution adhering to the surface of each ceramic ball 4 are converted into the “high antibacterial performance” and “ The action of “odor performance” removes and kills harmful and odorous bacteria such as bacteria and odor source particles that are propagated in the water-soluble cutting fluid. As a result, the water-soluble cutting fluid that has passed through the ceramic ball layer 3 is purified at a relatively high level, and then flows into the storage tank 1 through the pipe PB. In this case, the arrows A1, A2, A3, A4, and A5 sequentially indicate the flow of the water-soluble cutting fluid that is purified by the antibacterial / deodorizing action, for example, a pump (not shown). By the operation, the water-soluble cutting fluid in the storage tank 1 is highly purified and circulated through the purification device 2 under the action of both “antibacterial” and “deodorizing” at a high level. By continuously performing such a circulation action, as a result, the water-soluble cutting fluid in the storage tank 1 has no bad odor source, and bacteria harmful to the body such as bacteria are also killed. It becomes a cleaned aqueous solution. As a result of cutting by the cutting machine using the water-soluble cutting fluid in the storage tank 1 after such cleaning, the environment in the machine factory is exceptionally cleaned and is clean and free from odors. Become.

(Appendix)
In the embodiment of the present invention, a diluted platinum aqueous solution in which platinum nanoparticles are dissolved in water is used to purify a water-soluble cutting fluid in a storage tank installed in a machine factory. An example of applying to is described. However, instead of platinum, it is also possible to realize a purification device by using an aqueous solution obtained by further dissolving a stock solution of metal nanoparticles such as gold, silver, or palladium with water.

  While the embodiments of the present invention have been disclosed and described in detail above, the above description exemplifies aspects to which the present invention can be applied, and the present invention is not limited thereto. That is, various modifications and / or variations on the described aspects can be considered without departing from the scope of the invention.

  The present invention is suitable for a cutting fluid purifying apparatus to which a diluted platinum aqueous solution having high deodorant / antibacterial performance is applied.

OPL Stock solution of platinum aqueous solution HL Water PSL such as purified water Platinum aqueous solution CM diluted x times Cutting machine 1 Storage tank 2 Purification device 3 Ceramic ball layer 4 Ceramic ball 5 Porous filter 6 Non-woven filter

Claims (4)

A platinum aqueous solution obtained by diluting a stock solution of a platinum aqueous solution containing platinum nanoparticles having a particle size of nano-size dissolved in 1 liter of water with a volume of water in a range of up to 1500 times. The platinum aqueous solution according to claim 1,
A platinum aqueous solution obtained by diluting the stock solution of the platinum aqueous solution with water having a volume of any one of 400 times, 800 times, and 1500 times. A device for purifying the water-soluble cutting fluid in a storage tank storing water-soluble cutting fluid used in a machine factory,
A water-soluble cutting fluid purifying apparatus, comprising a ceramic ball layer in which a plurality of ceramic balls having a surface to which the infusion of the platinum aqueous solution according to claim 1 or 2 is attached. The water-soluble cutting fluid purification device according to claim 3,
An apparatus for purifying water-soluble cutting fluid, further comprising a porous filter disposed in a previous stage of the ceramic ball layer.

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