Nano-based metal cutting fluid and preparation method thereof

Abstract

The invention relates to the technical field of metal cutting fluid, in particular to nano-based metal cutting fluid and a preparation method thereof. The nano-based metal cutting fluid is prepared from the following raw materials in parts by mass: 50-60 parts of base oil, 2-5 parts of modified nano titanium phosphate, 1-2 parts of modified nano silicon nitride, 2-3 parts of a defoaming agent and 10-20 parts of water. The cutting fluid prepared by the invention can be more easily and stably adsorbed on a metal surface to form a protective layer, has good thermal conductivity, lubricity and antibacterial property, prevents serious abrasion and adhesion phenomena in a cutting process, prevents deterioration and stinking of the cutting fluid, prolongs the service life of a cutter and a workpiece, and has a good application prospect. The use and storage stability of the cutting fluid is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal cutting fluids, and in particular to a nano-based metal cutting fluid and a preparation method thereof. Background Art

[0002] In the field of metal cutting, cutting fluid is a vital auxiliary material. It can not only cool and lubricate the cutting area, reduce tool wear, but also clean the workpiece surface and prevent rust. With the improvement of modern manufacturing industry's requirements for processing efficiency, quality and environmental protection, traditional cutting fluids can no longer meet the needs of high-performance processing. Especially in the process of high-speed cutting, micro-cutting and cutting of difficult-to-cut materials, the cooling and lubrication properties of cutting fluids are particularly important.

[0003] Nano-based cutting fluids have attracted the attention of researchers due to their unique physical and chemical properties. Nanoparticles have extremely high specific surface area and special surface effects, which can significantly improve the lubricity, cooling and extreme pressure properties of cutting fluids. These characteristics make nano-scale cutting fluids show great potential in improving cutting efficiency, reducing energy consumption and improving machining surface quality.

[0004] Although nano-based cutting fluids have many advantages, they still face some challenges in practical applications. For example, the stable dispersion of nanoparticles in liquid media is a technical problem, and the problem of easy agglomeration will affect the performance of cutting fluids. In addition, the environmental friendliness and safety of nanoparticles are also factors that need to be considered during the research and development process.

[0005] Although the existing nano-scale cutting fluid products and technologies on the market have made some progress, there is still room for improvement, especially in improving the overall performance of cutting fluids, simplifying the preparation process and enhancing environmental protection characteristics. Therefore, developing new nano-scale cutting fluids and their preparation methods to overcome the limitations of existing technologies is an important research direction in the field of metal cutting technology. Summary of the invention

[0006] The invention relates to a nano-based metal cutting fluid, which is characterized in that modified nano titanium phosphate is used as an additive to significantly improve the lubricity, cooling and corrosion resistance of the cutting fluid. The cutting fluid is suitable for high-speed and high-precision metal cutting processing, can effectively extend the tool life, reduce processing surface defects, and has good environmental friendliness.

[0007] In view of the problems of existing cutting fluids such as insufficient lubricity and wear resistance and easy deterioration, the present invention aims to provide a nano-based metal cutting fluid with modified nano-titanium phosphate as an additive to improve the comprehensive performance of the cutting fluid.

[0008] A nano-based metal cutting fluid is composed of the following raw materials in parts by mass: 50-60 parts of base oil, 2-5 parts of modified nano titanium phosphate, 1-2 parts of modified nano silicon nitride, 2-3 parts of defoaming agent and 10-20 parts of water.

[0009] Furthermore, the modified nano-titanium phosphate is prepared from nano-titanium phosphate, aminosilane and salicylaldehyde. The specific preparation method is: adding aminosilane to nano-titanium phosphate, stirring and reacting at 50-60°C for 5-6h, washing, filtering and drying to obtain amino nano-titanium phosphate; mixing amino nano-titanium phosphate, salicylaldehyde and anhydrous ethanol, stirring and reacting at 50-60°C for 10-14h to obtain modified nano-titanium phosphate.

[0010] Furthermore, the mass ratio of the aminosilane to the nano-titanium phosphate is 6 to 8:1.

[0011] Furthermore, the mass ratio of the amino nano-titanium phosphate to salicylaldehyde is 5:1-3.

[0012] Furthermore, the aminosilane is one or more of 4-anilinotriethoxysilane and 11-aminoundecyltriethoxysilane.

[0013] Furthermore, the particle size of the modified nano-titanium phosphate is controlled at 30-800 nm.

[0014] Furthermore, the modified nano silicon nitride is prepared by modifying nano silicon nitride with 4-phenylbutyltrimethoxysilane, and the specific steps are as follows: adding 4-phenylbutyltrimethoxysilane to the modified nano silicon nitride, stirring and reacting at 50-60° C. for 5-6 hours, washing, filtering and drying to obtain the modified nano silicon nitride.

[0015] Furthermore, the mass ratio of the 4-phenylbutyltrimethoxysilane to the nano silicon nitride is 6 to 8:1.

[0016] Furthermore, the base oil includes mineral oil, vegetable oil or synthetic oil.

[0017] Furthermore, the defoamer is a polyether defoamer.

[0018] The preparation method of the nano-based metal cutting fluid comprises the following steps:

[0019] (1) mixing base oil, modified nano titanium phosphate, modified nano silicon nitride, defoamer and water in proportion to form a base fluid of cutting fluid;

[0020] (2) Filter the dispersed cutting fluid through a filter to remove large particle impurities to obtain a nano-based metal cutting fluid.

[0021] The beneficial effects of the present invention are:

[0022] The present invention uses modified nano titanium phosphate as a nano additive, and the modified nano titanium phosphate is prepared by modifying nano titanium phosphate with aminosilane and salicylaldehyde. After being modified with aminosilane, the nano titanium phosphate reacts with salicylaldehyde to form a Schiff base structure. Under the synergistic effect of the Pi-O-Ti structure, the Schiff base structure and the aldehyde group, the modified nano titanium phosphate can be more easily and stably adsorbed on the metal surface to form a protective layer, thereby preventing serious wear and adhesion during the cutting process, and extending the service life of the tool and the workpiece. In addition, the modified nano titanium phosphate has antibacterial properties and good thermal stability, thereby preventing the deterioration and odor of the cutting fluid. At the same time, under the action of long side chains and benzene rings, the modified nano titanium phosphate can be stably dispersed in the base oil, thereby improving the stability of the cutting fluid in use and storage.

[0023] The present invention adds a trace amount of modified nano silicon nitride, and the modified nano silicon nitride is prepared by modifying nano silicon nitride with 4-phenylbutyltrimethoxysilane. Under the action of long side chains and benzene rings, the modified nano silicon nitride can be stably dispersed in the base oil, and the modified nano silicon nitride has good thermal conductivity, and the thermal conductivity of the cutting fluid helps to quickly remove the heat generated in the cutting area, further control the cutting temperature, and prevent the titanium alloy from hardening due to high temperature or other adverse heat treatment effects. By optimizing the dosage relationship of modified nano silicon nitride and modified nano titanium phosphate, the lubricity of the cutting fluid can be further improved, the friction coefficient and wear rate can be reduced, the tool wear can be reduced, the tool life can be extended, and the quality of the cutting surface can be improved, thereby improving the stability of the use and storage of the cutting fluid. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the embodiments, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention belong to the protection scope of the present invention.

[0025] Example 1

[0026] (1) Add 6 g of 4-phenylbutyltrimethoxysilane to 1 g of nano silicon nitride (SuperTai DK-Si3N4-02), stir and react at 50°C for 5 h, wash with water, filter and dry to obtain modified nano silicon nitride.

[0027] (2) Add 8 g of 4-anilinotriethoxysilane to 1 g of nano titanium phosphate (Xinyuhong 15578-51-5, ground, sieved, and the particle size is controlled at 30-800 nm), stir and react at 50°C for 5 h, wash, filter, and dry to obtain amino nano titanium phosphate; mix 5 g of amino nano titanium phosphate, 1 g of salicylaldehyde, and 10 mL of anhydrous ethanol, stir and react at 50°C for 10 h to obtain modified nano titanium phosphate.

[0028] (3) Weigh the raw materials according to the following mass proportions: 50 parts of base oil (complex polyol ester PE-25), 2 parts of modified nano titanium phosphate, 1 part of modified nano silicon nitride, 2 parts of defoaming agent (Shengsheng polyether defoaming agent SDF-928) and 10 parts of water, mix them evenly to form a base liquid for cutting fluid, filter through a filter to remove large particles of impurities, and obtain a nano-based metal cutting fluid.

[0029] Example 2

[0030] (1) Add 7 g of 4-phenylbutyltrimethoxysilane to 1 g of nano silicon nitride, stir and react at 60° C. for 6 h, wash with water, filter and dry to obtain modified nano silicon nitride.

[0031] (2) Add 7 g of aminosilane to 1 g of nano-titanium phosphate, stir and react at 60 ° C for 6 h, wash, filter and dry to obtain amino nano-titanium phosphate; mix 5 g of amino nano-titanium phosphate, 2 g of salicylaldehyde and 20 mL of anhydrous ethanol, stir and react at 60 ° C for 14 h to obtain modified nano-titanium phosphate.

[0032] (3) Weigh the following raw materials in the following mass proportions: 60 parts of base oil, 4 parts of modified nano titanium phosphate, 2 parts of modified nano silicon nitride, 2 parts of defoaming agent and 10 parts of water, mix them evenly to form a base liquid of cutting fluid, filter through a filter to remove large particles of impurities, and obtain a nano-based metal cutting fluid.

[0033] Example 3

[0034] (1) Same as Example 2.

[0035] (2) Same as Example 2.

[0036] (3) Weigh the following raw materials in the following mass proportions: 60 parts of base oil, 4 parts of modified nano titanium phosphate, 1 part of modified nano silicon nitride, 2 parts of defoaming agent and 10 parts of water, mix them evenly to form a base liquid of cutting fluid, filter through a filter to remove large particles of impurities, and obtain a nano-based metal cutting fluid.

[0037] Example 4

[0038] (1) Same as Example 2.

[0039] (2) Same as Example 2.

[0040] (3) Weigh the following raw materials in the following mass proportions: 60 parts of base oil, 2 parts of modified nano titanium phosphate, 2 parts of modified nano silicon nitride, 2 parts of defoaming agent and 10 parts of water, mix them evenly to form a base liquid of cutting fluid, filter through a filter to remove large particles of impurities, and obtain a nano-based metal cutting fluid.

[0041] Example 5

[0042] (1) Same as Example 2.

[0043] (2) Same as Example 2.

[0044] (3) Weigh the following raw materials in the following mass proportions: 60 parts of base oil, 3 parts of modified nano titanium phosphate, 2 parts of modified nano silicon nitride, 2 parts of defoaming agent and 10 parts of water, mix them evenly to form a base liquid of cutting fluid, filter through a filter to remove large particles of impurities, and obtain a nano-based metal cutting fluid.

[0045] Example 6

[0046] (1) Same as Example 2.

[0047] (2) Same as Example 2.

[0048] (3) Weigh the following raw materials in the following mass proportions: 60 parts of base oil, 5 parts of modified nano titanium phosphate, 2 parts of modified nano silicon nitride, 2 parts of defoaming agent and 10 parts of water, mix them evenly to form a base liquid of cutting fluid, filter through a filter to remove large particles of impurities, and obtain a nano-based metal cutting fluid.

[0049] Example 7

[0050] (1) Same as Example 2.

[0051] (2) Add 7 g of 11-aminoundecyltriethoxysilane to 1 g of nano-titanium phosphate, stir and react at 60° C. for 6 h, wash, filter and dry to obtain amino nano-titanium phosphate; mix 5 g of amino nano-titanium phosphate, 2 g of salicylaldehyde and 20 mL of anhydrous ethanol, stir and react at 60° C. for 14 h to obtain modified nano-titanium phosphate.

[0052] (3) Same as Example 2.

[0053] Comparative Example 1

[0054] Weigh the following raw materials in the following mass proportions: 60 parts of base oil, 4 parts of nano titanium phosphate, 2 parts of nano silicon nitride, 2 parts of defoaming agent and 10 parts of water, mix them evenly to form a base liquid of cutting fluid, filter through a filter to remove large particle impurities, and obtain a nano-based metal cutting fluid.

[0055] Comparative Example 2

[0056] (1) Add 7 g of 4-phenylbutyltrimethoxysilane to 1 g of nano silicon nitride, stir and react at 60° C. for 6 h, wash with water, filter and dry to obtain modified nano silicon nitride.

[0057] (2) Weigh the following raw materials in the following mass proportions: 60 parts of base oil, 4 parts of nano titanium phosphate, 2 parts of modified nano silicon nitride, 2 parts of defoaming agent and 10 parts of water, mix them evenly to form a base liquid of cutting fluid, filter through a filter to remove large particles of impurities, and obtain a nano-based metal cutting fluid.

[0058] Comparative Example 3

[0059] (1) Add 7 g of 4-phenylbutyltrimethoxysilane to 1 g of nano silicon nitride, stir and react at 60° C. for 6 h, wash with water, filter and dry to obtain modified nano silicon nitride.

[0060] (2) Add 7 g of 4-anilinotriethoxysilane to 1 g of nano-titanium phosphate, stir and react at 60° C. for 6 h, wash with water, filter and dry to obtain amino nano-titanium phosphate.

[0061] (3) Weigh the following raw materials in the following mass proportions: 60 parts of base oil, 4 parts of amino nano-titanium phosphate, 2 parts of modified nano-silicon nitride, 2 parts of defoaming agent and 10 parts of water, mix them evenly to form a base liquid of cutting fluid, filter through a filter to remove large particles of impurities, and obtain a nano-based metal cutting fluid.

[0062] Comparative Example 4

[0063] (1) Same as Example 2.

[0064] (2) Same as Example 2.

[0065] (3) Weigh the following raw materials in the following mass proportions: 60 parts of base oil, 4 parts of modified nano titanium phosphate, 3 parts of modified nano silicon nitride, 2 parts of defoaming agent and 10 parts of water, mix them evenly to form a base liquid of cutting fluid, filter through a filter to remove large particles of impurities, and obtain a nano-based metal cutting fluid.

[0066] The test results of lubrication performance, stability and cooling performance of the nano metal cutting fluids prepared in the examples and comparative examples are shown in Table 1.

[0067] Table 1

[0068]

[0069]

[0070] It can be seen from the comparison of Example 2 and Comparative Examples 1-3 that the modified nano silicon nitride and nano titanium phosphate can significantly improve the lubrication performance and stability of the cutting fluid.

[0071] By comparing Example 2, Example 3, and Comparative Example 4, it can be seen that under the appropriate amount of modified nano-silicon nitride added, the cutting fluid has good lubrication properties, while the addition of excessive modified nano-silicon nitride will lead to a decrease in the lubricity of the cutting fluid (maximum no-seizure load PB value). This may be because too much modified nano-silicon nitride affects the bonding of modified nano-titanium phosphate with the matrix, thereby leading to increased wear.

[0072] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A nano-based metal cutting fluid, characterized in that: The invention is composed of the following raw materials in parts by weight: 50-60 parts of base oil, 2-5 parts of modified nano titanium phosphate, 1-2 parts of modified nano silicon nitride, 2-3 parts of defoaming agent and 10-20 parts of water; The modified nano titanium phosphate is prepared from nano titanium phosphate, aminosilane and salicylaldehyde.

2. The nano-based metal cutting fluid according to claim 1, characterized in that: The aminosilane is one or more of 4-anilinotriethoxysilane and 11-aminoundecyltriethoxysilane.

3. The nano-based metal cutting fluid according to claim 1, characterized in that: The modified nano silicon nitride is prepared by modifying nano silicon nitride with 4-phenylbutyltrimethoxysilane.

4. The nano-based metal cutting fluid according to claim 1, characterized in that: The base oil includes mineral oil, vegetable oil or synthetic oil; The defoamer is a polyether defoamer.

5. A method for preparing a nano-based metal cutting fluid, characterized in that: The steps include: (1) mixing base oil, modified nano titanium phosphate, modified nano silicon nitride, defoamer and water in proportion to form a base fluid of cutting fluid; (2) Filter the dispersed cutting fluid through a filter to remove large particle impurities to obtain a nano-based metal cutting fluid.

6. The method for preparing a nano-based metal cutting fluid as claimed in claim 5, characterized in that: The preparation method of the modified nano titanium phosphate comprises the following steps: adding aminosilane to nano titanium phosphate, stirring and reacting at 50-60°C for 5-6h, washing, filtering and drying to obtain amino nano titanium phosphate; mixing amino nano titanium phosphate, salicylaldehyde and anhydrous ethanol, stirring and reacting at 50-60°C for 10-14h to obtain modified nano titanium phosphate; The mass ratio of aminosilane to nano-titanium phosphate is 6 to 8:1; The mass ratio of the amino nano-titanium phosphate to salicylaldehyde is 5:1-3.

7. The method for preparing a nano-based metal cutting fluid as claimed in claim 5, characterized in that: The preparation method of the modified nano silicon nitride comprises the following specific steps: adding 4-phenylbutyltrimethoxysilane to the modified nano silicon nitride, stirring and reacting at 50-60° C. for 5-6 hours, washing with water, filtering and drying to obtain the modified nano silicon nitride; The mass ratio of the 4-phenylbutyltrimethoxysilane to the nano silicon nitride is 6 to 8:1.

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