Cutting fluid capable of improving cleaning performance and preparation method thereof

Abstract

The invention discloses a cutting fluid capable of improving cleaning performance. The cutting fluid comprises the following components in parts by weight: 20-45 parts of base oil; 10-25 parts of an antirust agent composite bag A; 5-8 parts of a lubricant; 0.1 to 0.5 part of a defoaming agent; 2-8 parts of an emulsifier; 5.1 to 21 parts of a PVP K90 solubilizer bag B; 5 to 10 parts of deionized water; the preparation method comprises the following steps: preparing the antirust complexing agent bag A, preparing the PVP K90 solubilizer bag B, heating and stirring all the raw materials, standing, cooling and filtering, sampling and detecting a finished product, and discharging, barreling and storing. The anti-rust property of the cutting fluid is improved by improving the film-forming property of the anti-rust cutting fluid on the metal surface.

Description

Technical Field

[0001] The invention belongs to the technical field of cutting fluids, and in particular relates to a cutting fluid with improved cleaning performance and a preparation method thereof. Background Art

[0002] There are many types of rust-proof cutting fluids commonly used in the metal processing industry, which are mainly divided into two categories: inorganic and organic. Inorganic rust inhibitors include inorganic salts such as sodium nitrite, molybdate, and borate. Their main mechanism of action is to form an insoluble passivation film on the metal surface to prevent the metal from rusting. However, the passivation film formed is usually not dense enough, and it often needs to be compounded with a film-forming agent to play a better anti-rust role. Although inorganic water-soluble rust inhibitors such as molybdate and tungstate have good anti-rust effects, they are relatively expensive. Low-priced rust inhibitors such as sodium nitrite, phosphate, and chromate are also restricted in use because they are prone to biological toxicity and environmental pollution. Organic water-soluble rust inhibitors mainly include alcoholamines, carboxylic acids, borates, amides, etc. It is mainly composed of hydrophilic polar groups and lipophilic non-polar hydrocarbon groups. Its mechanism of action is through electrostatic adsorption and chemical adsorption, so that the polar end of the rust inhibitor is adsorbed on the metal surface, and the non-polar end is then oriented to the side away from the metal surface, thereby forming a non-polar hydrophobic film on the metal surface, reducing the contact between the substances involved in corrosion and the electric charge and the metal surface, and slowing down the rate of rust.

[0003] The invention patent with application number CN201810749220.2 is an environmentally friendly water-based anti-rust cutting fluid and its preparation method, which includes the following raw materials: water, triethanolamine oleate, sodium alkyl sulfonate, polyethylene glycol, sodium polyacrylate, coconut oil diethanolamide, rust inhibitor, sodium lauryl alcohol polyether sulfate, vegetable oil, sulfonated oil. The anti-rust cutting fluid prepared by this invention can provide good protection for cutting during mechanical processing. It uses biodegradable vegetable oil substances instead of mineral oil as the base oil of the cutting fluid, which is more energy-saving and environmentally friendly; at the same time, by adding benzotriazole, sodium methyl silicate and dihydroxymethyl ether and assisting ultrasonic treatment, it plays a synergistic role, and is an environmentally friendly water-based cutting fluid.

[0004] The above patent belongs to one of the organic water-soluble rust inhibitors. It improves the environmental performance of the cutting fluid by replacing mineral oil with vegetable oil as the base oil, and has good lubrication performance. However, the physical properties of vegetable oil are affected by the structure and composition of fatty acids, are easily oxidized at high temperatures, and have a high pour point. Compared with mineral oil as the base oil, its high and low temperature performance are not ideal, and its film-forming property and sustainability after film formation are poor, which will reduce its rust prevention effect. It needs to be assisted by other methods, which greatly increases the production cost of the cutting fluid. Due to oxidation at high and low temperatures, the cleaning performance is poor, so a cutting fluid with good cleaning performance is needed. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a cutting fluid with improved cleaning performance, the components of which are as follows by weight: 20~45 parts of base oil; Rust inhibitor compound package A10~25 parts; 5~8 parts of lubricant; Defoaming agent 0.1~0.5 parts; Emulsifier 2~8 parts; PVP K90 solubilizer package B 5.1~21 parts; 5~10 parts of deionized water.

[0006] Preferably, the anti-rust compound package A comprises: 0.1~5 parts of boric acid; 1-10 parts of monoethanolamine; 1-10 parts of triethanolamine; Sebacic acid 0.1-5 parts; 10 parts of deionized water.

[0007] Preferably, the PVP K90 solubilizer package B comprises: PVP K90 0.1~1 part; 5~20 parts of deionized water.

[0008] Preferably, the base oil is spindle oil; the lubricant is chlorinated paraffin and propylene glycol dioleate; and the defoaming agent is polydimethylsiloxane.

[0009] Preferably, the emulsifier comprises a main emulsifier and a co-emulsifier, the main emulsifier is a boron-containing emulsifier, and the co-emulsifier is hydroxyethyl hexahydrotriazine.

[0010] Preferably, the PVP K90 is polyvinyl pyrrolidone.

[0011] A method for preparing a cutting fluid with improved cleaning performance comprises the following steps: S1. Add 10 parts of deionized water, 0.1 to 5 parts of boric acid, 1 to 10 parts of monoethanolamine, 1 to 10 parts of triethanolamine, 0.1 to 5 parts of sebacic acid into the reactor, stir to obtain a rust inhibitor composite package A, and set aside; S2. Add 5 to 20 parts of deionized water and 0.1 to 1 part of PVP K90 to the reactor, stir to obtain PVP solubilizer package B, and set aside for later use; S3. Add 10-25 parts of the rust inhibitor composite package A mixed in step S1, 5.1-21 parts of the PVP K90 solubilizer package B mixed in step S2, 20-45 parts of base oil, 5-8 parts of lubricant, 0.1-0.5 parts of defoamer, 2-8 parts of emulsifier and 5-10 parts of deionized water into a reactor, heat to 60°C and maintain the temperature for mechanical stirring and pulse stirring, the mechanical stirring time is 25 minutes, and the pulse stirring time is 5 minutes; S4. After the stirred solution is allowed to stand and cool naturally, the solution is filtered to remove the incompletely dissolved precipitate; S5. extracting the filtered solution sample for film forming property testing; S6. After confirming that the sample has passed the test, the solution is discharged into barrels for storage.

[0012] The present invention has the following beneficial effects: 1. The base oil is spindle oil commonly used in the mechanical field to reduce the production cost of the cutting fluid itself. At the same time, the film-forming agent polyvinyl pyrrolidone (PVP for short) is added to the anti-rust cutting fluid. Since PVP has good film-forming and adsorption properties, it itself does not help metal rust prevention, but the rust inhibitor can be quickly dissolved in PVP, so that it can quickly form a dense passivation film on the metal surface, which has an anti-rust effect on the metal; and since the spindle oil itself has a high stability, it can still maintain film-forming properties in high and low temperature environments, ensuring that the film-forming speed of the cutting fluid is accelerated and the film-forming durability is extended; 2. The ingredients in the rust inhibitor have been improved, so that the rust inhibitor and the film-forming agent are integrated with each other, the solubilization and auxiliary film-forming effects of the cutting fluid are improved, and the use of rust inhibitor ingredients such as sodium nitrite, phosphate, chromate, etc. that are prone to produce biological toxicity and cause environmental pollution is avoided, so that the cutting fluid can be quickly biodegraded and play a role in protecting the environment. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the tables in the embodiments of the present invention.

[0014] Example 1 A cutting fluid with improved cleaning performance, the specific preparation process of which is: 10 parts of deionized water, 3 parts of boric acid, 4 parts of monoethanolamine, 5 parts of triethanolamine, and 3 parts of sebacic acid are placed in a reactor and stirred evenly to obtain a rust inhibitor composite package A, which is retained for standby use; after the reactor is cleaned, 10 parts of deionized water and 0.5 parts of PVP K90 polyvinyl pyrrolidone are added to the reactor, first heated at 40°C for 30 minutes, with a stirring device rotating speed of 200 r / min to fully swell the PVP K90 polyvinyl pyrrolidone, then heated to 75°C, with a stirring device rotating speed of 300 r / min and stirred for 1 hour to fully dissolve the PVP K90 polyvinyl pyrrolidone, to obtain a PVP K90 solubilizer package B, which is retained for standby use. 25 parts of the mixed rust inhibitor compound package A, 10.5 parts of the mixed PVP K90 solubilizer package B, 45 parts of spindle oil, 4 parts of chlorinated paraffin and propylene glycol dioleate in the lubricant, 0.1 part of defoaming agent polydimethylsiloxane, 5 parts of boron-containing emulsifier, 3 parts of co-emulsifier hydroxyethyl hexahydrotriazine and 8 parts of deionized water were added to the reactor, heated to 60°C and maintained at this temperature for mechanical stirring and pulse stirring. The mechanical stirring time was 25 minutes and the pulse stirring time was 5 minutes to ensure complete mixing.

[0015] After the stirred solution is left to cool naturally, it is filtered to remove the incompletely dissolved precipitate, and a sample of the filtered solution is extracted for film-forming property testing. After the sample is confirmed to be qualified, the solution is discharged and barreled for storage.

[0016] Example 2 A cutting fluid with improved cleaning performance, the specific preparation process of which is: 10 parts of deionized water, 3 parts of boric acid, 4 parts of monoethanolamine, 5 parts of triethanolamine, and 3 parts of sebacic acid are placed in a reactor and stirred evenly to obtain a rust inhibitor composite package A, which is retained for standby use; after the reactor is cleaned, 10 parts of deionized water and 1 part of PVP K90 polyvinyl pyrrolidone are added to the reactor, first heated at 40°C for 30 minutes, with a stirring device rotating speed of 200 r / min to fully swell the PVP K90 polyvinyl pyrrolidone, then heated to 75°C, with a stirring device rotating speed of 300 r / min and stirred for 1 hour to fully dissolve the PVP K90 polyvinyl pyrrolidone, to obtain a PVP K90 solubilizer package B, which is retained for standby use. 25 parts of the mixed rust inhibitor compound package A, 10.5 parts of the mixed PVPK90 solubilizer package B, 45 parts of spindle oil, 4 parts of chlorinated paraffin and propylene glycol dioleate in the lubricant, 0.1 part of defoaming agent polydimethylsiloxane, 5 parts of boron-containing emulsifier, 3 parts of co-emulsifier hydroxyethyl hexahydrotriazine and 8 parts of deionized water were added to the reactor, heated to 60°C and maintained at this temperature for mechanical stirring and pulse stirring. The mechanical stirring time is 25 minutes and the pulse stirring time is 5 minutes to ensure complete mixing.

[0017] After the stirred solution is left to cool naturally, it is filtered to remove the incompletely dissolved precipitate, and a sample of the filtered solution is extracted for film-forming property testing. After the sample is confirmed to be qualified, the solution is discharged and barreled for storage.

[0018] Comparative Example 1 A cutting fluid, which is different from the embodiment 1-2 in that the base oil is sesame oil. The specific preparation process is as follows: 10 parts of deionized water, 3 parts of boric acid, 4 parts of monoethanolamine, 5 parts of triethanolamine, and 3 parts of sebacic acid are placed in a reactor and stirred evenly to obtain a rust inhibitor composite package A, which is retained for standby use; after the reactor is cleaned, 10 parts of deionized water and 0.5 parts of PVP K90 polyvinyl pyrrolidone are added to the reactor, first heated at 40°C for 30 minutes, the stirring device speed is 200r / min, the PVP K90 polyvinyl pyrrolidone is fully swollen, then the temperature is raised to 75°C, the stirring device speed is increased to 300r / min, and stirred for 1h to fully dissolve the PVP K90 polyvinyl pyrrolidone, to obtain a PVP K90 solubilizer package B, which is retained for standby use. Add 25 parts of the mixed rust inhibitor compound package A, 10.5 parts of the mixed PVP K90 solubilizer package B, 45 parts of sesame oil, 4 parts of chlorinated paraffin and propylene glycol dioleate in the lubricant, 0.1 parts of defoaming agent polydimethylsiloxane, 5 parts of boron-containing emulsifier, 3 parts of co-emulsifier hydroxyethyl hexahydrotriazine and 8 parts of deionized water into the reactor, heat to 60°C and maintain the temperature for mechanical stirring and pulse stirring. The mechanical stirring time is 25 minutes and the pulse stirring time is 5 minutes to ensure complete mixing. After the stirred solution is naturally cooled, the solution is filtered to screen out the incompletely dissolved precipitate, and the film-forming property of the filtered solution sample is extracted for testing.

[0019] Comparative Example 2 A cutting fluid, which differs from Example 1 in that: PVP K90 polyvinyl pyrrolidone is not added. The specific preparation process is: 10 parts of deionized water, 3 parts of boric acid, 4 parts of monoethanolamine, 5 parts of triethanolamine, and 3 parts of sebacic acid are placed in a reactor and stirred evenly to obtain a rust inhibitor composite package A, which is retained for standby use; 25 parts of the mixed rust inhibitor composite package A, 10.5 parts of the mixed PVP K90 solubilizer package B, 45 parts of spindle oil, 4 parts of chlorinated paraffin and propylene glycol dioleate in the lubricant, 0.1 parts of defoaming agent polydimethylsiloxane, 5 parts of boron-containing emulsifier, 3 parts of co-emulsifier hydroxyethyl hexahydrotriazine and 8 parts of deionized water are added to the reactor, heated to 60°C, and then maintained at this temperature for mechanical stirring and pulse stirring, the mechanical stirring time is 25 minutes, and the pulse stirring time is 5 minutes to ensure complete mixing.

[0020] After the stirred solution is left to cool naturally, it is filtered to remove the incompletely dissolved precipitate, and a sample of the filtered solution is extracted to test its film-forming property.

[0021] Four portions of solution were extracted from the finished cutting fluids in the above-mentioned Examples 1-2 and Comparative Examples 1-2, respectively, and film-forming speed test, antibacterial property test, wetting property test and anti-rust property test were respectively carried out.

[0022] (1) Film forming speed test: Clean the glass plate and scraper and keep them consistent with the cutting fluid temperature. Pour the cutting fluid on one end of the glass plate and use a scraper to form a uniform liquid film. Shake the glass plate every 1 minute or so to observe the fluidity of the liquid film until all the liquid films have no fluidity. Record the film-forming time of each sample in Table 1.

[0023] (2) Antibacterial performance test Add 900 ml of the cutting fluid samples prepared in Example 1-2 and Comparative Example 1-2 to 4 1L beakers, then add 100 ml of the cultured bacterial antibacterial agent, 10 g of iron filings, corn starch, cheese and other nutrients required for microbial growth, stir evenly, and place the beakers in 30°C warm water for water bath insulation. During this period, the samples should avoid ventilation to prevent impurities and other variables in the air from affecting the growth of colonies. The pH value of the samples was measured every 10 days, and the number of bacterial colonies and fungal colonies in the samples was detected, and whether there was any odor. The duration was 3 months, and the total number of fungal colonies reached 102cfu / ml or more and the total number of bacterial colonies reached 102cfu / ml or more. cfu / ml or above was used as a sample deterioration indicator, and the time data of each sample starting to deteriorate was recorded in Table 1.

[0024] (3) Wetting performance test The wetting performance test is to measure the tension on the surface of the cutting fluid sample. The lower the tension value, the higher the lubricity. The test results are recorded in Table 1.

[0025] (4) Anti-rust performance test Drop equal amounts of cutting fluid samples on four clean iron sheets of the same size and thickness. The amount of cutting fluid here is the amount of liquid that comes out after squeezing the glass dropper. Place the iron sheet in a constant temperature box for 24 hours, and then observe the rust every 1 hour until rust appears. The time when the sample rusts is recorded in Table 1.

[0026] Table 1, performance test table: Combining Examples 1-2, Comparative Example 1 and Table 1, it can be seen that the stability and antibacterial properties of the cutting fluid using spindle oil as the base oil are significantly better than those of the cutting fluid using vegetable oil as the base oil. Since a trace amount of PVP K90 polyvinyl pyrrolidone is added in Examples 1-2 and Comparative Example 1, and PVP K90 polyvinyl pyrrolidone is not added in Comparative Example 2, it can be clearly seen from Table 1 that the film forming time and rust prevention performance of Comparative Example 2 are not as good as those of Examples 1-2, which is a huge gap in the actual production and processing process, because PVP K90 polyvinyl pyrrolidone itself improves the solubilization and auxiliary film formation properties of the rust inhibitor, so that the rust inhibitor components in the cutting fluid can be fully adsorbed on the workpiece surface, maximizing the rust prevention performance of the cutting fluid.

[0027] The difference between Example 1 and Example 2 is that the PVP K90 polyvinyl pyrrolidone in Example 2 is twice that in Example 1, and the test data in Table 1 has not doubled. Therefore, considering the cost performance and the actual use requirements in production, Example 1 is the most preferred.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cutting fluid with improved cleaning performance, characterized in that: The components are in proportion by weight: 20~45 parts of base oil; Rust inhibitor compound package A10~25 parts; 5~8 parts of lubricant; Defoaming agent 0.1~0.5 parts; Emulsifier 2~8 parts; PVP K90 solubilizer package B 5.1~21 parts; 5~10 parts of deionized water.

2. The cutting fluid with improved cleaning performance according to claim 1, characterized in that: The anti-rust compound package A comprises: 0.1~5 parts of boric acid; 1-10 parts of monoethanolamine; 1-10 parts of triethanolamine; Sebacic acid 0.1-5 parts; 10 parts of deionized water.

3. The cutting fluid with improved cleaning performance according to claim 1, characterized in that: The PVP K90 solubilizer package B contains: PVP K90 0.1~1 part; 5~20 parts of deionized water.

4. The cutting fluid with improved cleaning performance according to claim 1, characterized in that: The base oil is spindle oil; the lubricant is chlorinated paraffin and propylene glycol dioleate; and the defoaming agent is polydimethylsiloxane.

5. The cutting fluid with improved cleaning performance according to claim 1, characterized in that: The emulsifier comprises a main emulsifier and a co-emulsifier, wherein the main emulsifier is a boron-containing emulsifier and the co-emulsifier is hydroxyethyl hexahydrotriazine.

6. The cutting fluid with improved cleaning performance according to claim 3, characterized in that: The PVP K90 is polyvinyl pyrrolidone.

7. A method for preparing a cutting fluid with improved cleaning performance, characterized in that: The following steps are involved: S1. Add 10 parts of deionized water, 0.1 to 5 parts of boric acid, 1 to 10 parts of monoethanolamine, 1 to 10 parts of triethanolamine, 0.1 to 5 parts of sebacic acid into the reactor, stir to obtain a rust inhibitor composite package A, and set aside; S2. Add 5 to 20 parts of deionized water and 0.1 to 1 part of PVP K90 to the reactor, stir to obtain PVP solubilizer package B, and set aside for later use; S3. Add 10-25 parts of the rust inhibitor composite package A mixed in step S1, 0.1-10 parts of the PVP K90 solubilizer package B mixed in step S2, 20-45 parts of base oil, 5-8 parts of lubricant, 0.1-0.5 parts of defoamer, 2-8 parts of emulsifier and 5-10 parts of deionized water into a reactor, heat to 60°C and maintain the temperature for mechanical stirring and pulse stirring, the mechanical stirring time is 25 minutes, and the pulse stirring time is 5 minutes; S4. After the stirred solution is allowed to stand and cool naturally, the solution is filtered to remove the incompletely dissolved precipitate; S5. extracting the filtered solution sample for film forming property testing; S6. After confirming that the sample has passed the test, the solution is discharged into barrels for storage.

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