A modified hexagonal boron nitride nanosheet, a modified hexagonal boron nitride grinding fluid and a preparation method thereof

Abstract

The invention discloses a modified hexagonal boron nitride nanosheet, a modified hexagonal boron nitride grinding fluid and a preparation method thereof. The modified hexagonal boron nitride nanosheet is a hydroxylated h-BN nanosheet prepared by an electrolytic method. The modified hexagonal boron nitride grinding fluid comprises the following components in percentage by mass: 60-80% deionized water; 5-15% surfactant II; 5-15% modified hexagonal boron nitride nanosheet; 5-15% grinding aid; and pH regulator II. The invention uses H 2 O 2 As a mild oxidant, hydroxyl groups can be introduced without destroying the basic structure of h‑BN; the electrolysis process not only promotes H 2 O 2 Decomposition produces active hydroxyl groups, which also help in the exfoliation of h-BN. The electrolytic method can produce a more uniform distribution of hydroxyl groups on the h-BN surface. Compared with the ball milling method, the electrolytic method can complete the hydroxylation and exfoliation process in a shorter time, avoiding mechanical damage during the ball milling process, maintaining the integrity of the h-BN nanosheets, and facilitating the expansion of production.

Description

Technical Field

[0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a modified hexagonal boron nitride nanosheet, a modified hexagonal boron nitride grinding fluid and a preparation method thereof. Background Art

[0002] At present, water-based grinding fluids basically have the defect of good cooling effect but poor lubrication effect, so improving the lubrication ability of water-based grinding fluids is the development bottleneck of water-based grinding fluids. Hexagonal boron nitride (BN), as a structural analogue of graphite, has better physical and chemical properties than graphite. During the grinding process, it can form a lubricating film on the surface of the product, which can reduce the stress impact of grinding force on ceramic products to a certain extent, which is of great help to the improvement of water-based grinding fluids.

[0003] Grinding fluid is prone to deterioration, which can cause corrosion to the product. This is a problem that most mainstream grinding fluids have. The main reasons are: the water quality of the grinding fluid is poor, the operator uses it improperly during the grinding fluid processing, which makes the grinding fluid contaminated, and improper storage methods can easily allow bacteria in the air to enter the grinding fluid. Current preventive measures include: using pure water to prepare high-quality and stable grinding fluids, filtering the grinding fluid regularly to prevent pollution, and strengthening anti-corrosion measures between supply and demand.

[0004] There are few types of BN water-based grinding fluids, and they are still in the research and development experimental stage. The main reason is that BN has poor solubility in water and the dispersion effect in water is not ideal.

[0005] At present, the exfoliation and modification of hexagonal boron nitride mainly focus on chemical vapor deposition, hydroxide-assisted ball milling, plasma-assisted method, oxygen free radical functionalization, thermal exfoliation and functionalization, and water vapor treatment, but the operation steps of these methods are very complicated and require a lot of energy. Summary of the invention

[0006] In order to solve the technical problems existing in the prior art, the object of the present invention is to provide a modified hexagonal boron nitride nanosheet, a modified hexagonal boron nitride grinding fluid and a preparation method thereof.

[0007] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0008] A modified hexagonal boron nitride nanosheet is a hydroxylated h-BN nanosheet prepared by an electrolytic method.

[0009] The present invention also discloses a method for preparing a modified hexagonal boron nitride nanosheet, comprising the following steps:

[0010] 1) Design of electrolyte

[0011] The electrolyte includes a hydrogen peroxide solution;

[0012] 2) Prepare electrode materials;

[0013] 3) Setting electrolysis conditions and performing electrolysis;

[0014] 4) After the electrolysis is completed, post-processing is performed;

[0015] 5) Centrifugal separation;

[0016] 6) Wash several times with solvent;

[0017] 7) Freeze drying;

[0018] There is no particular order for step 1) and step 2).

[0019] Furthermore, in the preparation method of the modified hexagonal boron nitride nanosheets, the electrolyte also includes at least one of an auxiliary electrolyte, a surfactant I, and a pH adjuster I; the auxiliary electrolyte is an ammonium sulfate solution, the surfactant I is sodium dodecyl sulfate, and the pH adjuster I is dilute sulfuric acid.

[0020] Furthermore, in the preparation method of the modified hexagonal boron nitride nanosheets, the electrode material includes an anode and a cathode, the anode is a high-purity hexagonal boron nitride bulk electrode, and the cathode is a platinum electrode or a graphite electrode.

[0021] Furthermore, in the preparation method of the modified hexagonal boron nitride nanosheets, the electrolysis conditions are:

[0022] Electrolysis voltage: 15~25V;

[0023] Current density: 30~50mA / cm 2 ;

[0024] Electrolysis temperature: 40~50℃;

[0025] Electrolysis time: 1~3h;

[0026] Stirring speed: 300~400rpm.

[0027] Furthermore, in the preparation method of the modified hexagonal boron nitride nanosheets, the post-treatment step is:

[0028] After the electrolysis, the solution was cooled to room temperature and ultrasonically treated for 20-30 min.

[0029] Furthermore, in the method for preparing the modified hexagonal boron nitride nanosheets, the centrifugal separation step is:

[0030] The first centrifugation: 3000±500rpm, 10~20min, to remove large particles;

[0031] Second centrifugation: 12000±500rpm, 30~40min, to collect hydroxylated h-BN nanosheets;

[0032] Centrifugation temperature: 4~10℃.

[0033] Furthermore, in the preparation method of the modified hexagonal boron nitride nanosheets, in step 7), the obtained nanosheets are placed in the freezer layer of a refrigerator for one night, and then placed in a freeze drying oven for 24 to 36 hours, and finally a dry white powder is obtained, which is the desired modified hexagonal boron nitride nanosheets.

[0034] The present invention also discloses a modified hexagonal boron nitride grinding fluid, wherein the modified hexagonal boron nitride grinding fluid comprises the following components in percentage by mass:

[0035] Deionized water 60~80%;

[0036] Surfactant II 5~15%;

[0037] Modified hexagonal boron nitride nanosheets 5~15%;

[0038] Grinding aid 5~15%;

[0039] Appropriate amount of pH adjuster II.

[0040] The present invention also discloses a method for preparing a modified hexagonal boron nitride grinding fluid, comprising the following steps:

[0041] (1) Prepare the base fluid

[0042] Add deionized water to the stirrer, turn on the stirrer to maintain uniform stirring, then add surfactant II and continue stirring for 20-30 minutes until it is completely dissolved;

[0043] (2) Gradually add pH adjuster II to the base solution to adjust the pH value to 7-10;

[0044] (3) Add the grinding aid to the base liquid and continue stirring for 30 to 60 minutes to ensure uniform dispersion;

[0045] (4) Slowly add the modified hexagonal boron nitride nanosheets as described above into the base liquid, ensuring that they are evenly dispersed during the stirring process, so as to obtain the desired modified hexagonal boron nitride grinding fluid, which is then stored in a sealed container to avoid light and pollution in order to maintain its performance.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] (1) Mild oxidation: Using H2O2 as a mild oxidant, hydroxyl groups can be introduced without destroying the basic structure of h-BN;

[0048] (2) Electrochemical promotion: The electrolysis process not only promotes the decomposition of H2O2 to produce active hydroxyl groups, but also helps the exfoliation of h-BN;

[0049] (3) Good uniformity: The electrolysis method can produce a more uniform hydroxyl distribution on the h-BN surface;

[0050] (4) High efficiency: Compared with the ball milling method, the electrolysis method can complete the hydroxylation and stripping process in a shorter time and is easy to expand production;

[0051] (5) Low damage: It avoids mechanical damage during ball milling and maintains the integrity of h-BN nanosheets;

[0052] (6) Environmentally friendly: The reagents used are relatively mild, reducing the impact of strong alkali on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is an electron microscope image of the present invention. DETAILED DESCRIPTION

[0054] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0055] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0056] In one aspect, the present invention discloses a modified hexagonal boron nitride nanosheet, which is a hydroxylated h-BN nanosheet prepared by an electrolytic method.

[0057] On the other hand, the present invention also discloses a method for preparing modified hexagonal boron nitride nanosheets, comprising the following steps:

[0058] 1) Design of electrolyte

[0059] Main ingredients: 0.1M hydrogen peroxide (H2O2) aqueous solution;

[0060] Auxiliary electrolyte: 0.05M ammonium sulfate solution;

[0061] Surfactant I: 0.01 M sodium dodecyl sulfate;

[0062] pH regulator Ⅰ: dilute sulfuric acid, used to adjust the pH to 5~6;

[0063] 2) Prepare electrode materials

[0064] Anode: high purity hexagonal boron nitride bulk electrode;

[0065] Cathode: platinum electrode or graphite electrode;

[0066] 3) Set electrolysis conditions

[0067] Electrolysis voltage: 15~25V;

[0068] Current density: 30~50mA / cm 2 ;

[0069] Electrolysis temperature: 40~50℃, slightly heated to promote the reaction;

[0070] Electrolysis time: 1~3h;

[0071] Stirring speed: 300~400rpm;

[0072] Start electrolysis. During the electrolysis process, H2O2 will decompose on the electrode surface to produce hydroxyl radicals, which will attack the surface of high-purity hexagonal boron nitride to form Figure 1 The hydroxylated h-BN nanosheets shown, while the electrolysis process promotes the exfoliation of hexagonal boron nitride;

[0073] 4) Post-processing

[0074] After the electrolysis, the solution was cooled to room temperature and ultrasonically treated for 20–30 min to further disperse the nanosheets;

[0075] 5) Centrifugal separation

[0076] The first centrifugation: 3000±500rpm, 10~20min, to remove large particles;

[0077] Second centrifugation: 12000±500rpm, 30~40min, to collect hydroxylated h-BN nanosheets;

[0078] Centrifugation temperature: 4~10℃;

[0079] 6) Wash with deionized water and ethanol alternately 3 to 5 times;

[0080] 7) Freeze drying

[0081] The obtained nanosheets are placed in the freezer layer of a refrigerator for one night, and then placed in a freeze drying oven for 24 to 36 hours, and finally a dry white powder is obtained, which is the desired modified hexagonal boron nitride nanosheets, which can be used to prepare grinding fluid;

[0082] There is no particular order for step 1) and step 2).

[0083] Advantages of the hydroxylation method described above include:

[0084] (1) Mild oxidation: Using H2O2 as a mild oxidant, hydroxyl groups can be introduced without destroying the basic structure of h-BN;

[0085] (2) Electrochemical promotion: The electrolysis process not only promotes the decomposition of H2O2 to produce active hydroxyl groups, but also helps the exfoliation of h-BN;

[0086] (3) Good uniformity: The electrolysis method can produce a more uniform hydroxyl distribution on the h-BN surface;

[0087] (4) High efficiency: Compared with the ball milling method, the electrolysis method can complete the hydroxylation and stripping process in a shorter time;

[0088] (5) Low damage: It avoids mechanical damage during ball milling and maintains the integrity of h-BN nanosheets;

[0089] (6) Environmentally friendly: The reagents used are relatively mild, reducing the impact of strong alkali on the environment.

[0090] The present invention also discloses a modified hexagonal boron nitride grinding fluid, comprising the following components in percentage by mass:

[0091] Deionized water 60~80%;

[0092] Surfactant II 5~15%: polyvinyl pyrrolidone (PVP), sodium dodecylbenzene sulfonate (SDBS), etc.

[0093] Grinding aids 5~15%: polypropylene alcohol, sodium polyacrylate, etc.

[0094] Modified hexagonal boron nitride nanosheets 5~15%;

[0095] pH adjuster II: sodium hydroxide, hydrochloric acid, etc., used to adjust the pH of the solution to 7~10.

[0096] The present invention also discloses a method for preparing a modified hexagonal boron nitride grinding fluid, comprising the following steps:

[0097] (1) Prepare the base liquid. Add deionized water to the stirrer, turn on the stirrer to maintain uniform stirring, then add surfactant II and continue stirring for 20 to 30 minutes until it is completely dissolved;

[0098] (2) pH adjustment. Gradually add pH adjuster II to the base solution to adjust the pH value to the range of 7 to 10;

[0099] (3) Add grinding aid. Add the grinding aid to the base liquid and continue stirring for 30 to 60 minutes to ensure uniform dispersion;

[0100] (4) Add modified hexagonal boron nitride nanosheet powder. Slowly add the modified hexagonal boron nitride nanosheet powder into the base fluid, ensuring that it is evenly dispersed during the stirring process. The desired modified hexagonal boron nitride grinding fluid can be obtained and stored in a sealed container to avoid light and pollution to maintain its performance.

[0101] Example 1

[0102] A modified hexagonal boron nitride nanosheet is a hydroxylated h-BN nanosheet prepared by an electrolytic method.

[0103] A method for preparing modified hexagonal boron nitride nanosheets comprises the following steps:

[0104] 1) Design of electrolyte

[0105] Main ingredients: 0.1M hydrogen peroxide (H2O2) aqueous solution;

[0106] Auxiliary electrolyte: 0.05M ammonium sulfate solution;

[0107] Surfactant I: 0.01 M sodium dodecyl sulfate;

[0108] pH regulator Ⅰ: dilute sulfuric acid, adjust pH to 6;

[0109] 2) Prepare electrode materials

[0110] Anode: high purity hexagonal boron nitride bulk electrode;

[0111] Cathode: platinum electrode or graphite electrode;

[0112] 3) Set electrolysis conditions

[0113] Electrolysis voltage: 20V;

[0114] Current density: 45mA / cm 2 ;

[0115] Electrolysis temperature: 48°C;

[0116] Electrolysis time: 2h;

[0117] Stirring speed: 300 rpm;

[0118] Start electrolysis. During the electrolysis process, H2O2 will decompose on the electrode surface to produce hydroxyl radicals, which will attack the surface of high-purity hexagonal boron nitride to form Figure 1 The hydroxylated h-BN nanosheets shown, while the electrolysis process promotes the exfoliation of hexagonal boron nitride;

[0119] 4) Post-processing

[0120] After the electrolysis, the solution was cooled to room temperature and ultrasonicated for 20 min to further disperse the nanosheets;

[0121] 5) Centrifugal separation

[0122] The first centrifugation: 3000 rpm, 15 min, to remove large particles;

[0123] The second centrifugation: 12000 rpm, 30 min, to collect hydroxylated h-BN nanosheets;

[0124] Centrifugation temperature: 4°C;

[0125] 6) Wash with deionized water and ethanol alternately for 3 times;

[0126] 7) Freeze drying

[0127] The obtained nanosheets were placed in the freezer layer of a refrigerator and frozen overnight, and then placed in a freeze drying oven for 24 hours to obtain a dry white powder, which can be used to prepare a grinding fluid;

[0128] There is no particular order for step 1) and step 2).

[0129] A modified hexagonal boron nitride grinding fluid comprises the following components in percentage by mass:

[0130] Deionized water 60%;

[0131] Surfactant II 13%: polyvinyl pyrrolidone (PVP) 10%, sodium dodecylbenzene sulfonate (SDBS) 3%;

[0132] Polypropylene alcohol grinding aid 10%:

[0133] Modified hexagonal boron nitride nanosheets 5%;

[0134] pH adjuster II: Sodium hydroxide, used to adjust the pH of the solution to 7.

[0135] A method for preparing a modified hexagonal boron nitride grinding fluid comprises the following steps:

[0136] (1) Prepare the base liquid. Add deionized water to the stirrer, turn on the stirrer to maintain uniform stirring, then add surfactant II and continue stirring for 20 minutes until it is completely dissolved;

[0137] (2) pH adjustment. Gradually add pH adjuster II to the base solution to adjust the pH value to 7;

[0138] (3) Add grinding aid. Add the grinding aid to the base liquid and continue stirring for 30 minutes to ensure uniform dispersion;

[0139] (4) Add modified hexagonal boron nitride nanosheet powder. Slowly add the modified hexagonal boron nitride nanosheet powder into the base fluid, ensuring that it is evenly dispersed during the stirring process. The desired modified hexagonal boron nitride grinding fluid can be obtained and stored in a sealed container to avoid light and pollution to maintain its performance.

[0140] Example 2

[0141] A modified hexagonal boron nitride nanosheet is a hydroxylated h-BN nanosheet prepared by an electrolytic method.

[0142] A method for preparing modified hexagonal boron nitride nanosheets comprises the following steps:

[0143] 1) Design of electrolyte

[0144] Main ingredients: 0.1M hydrogen peroxide (H2O2) aqueous solution;

[0145] Auxiliary electrolyte: 0.05M ammonium sulfate solution;

[0146] Surfactant I: 0.01 M sodium dodecyl sulfate;

[0147] pH regulator Ⅰ: dilute sulfuric acid, adjust pH to 5;

[0148] 2) Prepare electrode materials

[0149] Anode: high purity hexagonal boron nitride bulk electrode;

[0150] Cathode: platinum electrode or graphite electrode;

[0151] 3) Set electrolysis conditions

[0152] Electrolysis voltage: 20V;

[0153] Current density: 45mA / cm 2 ;

[0154] Electrolysis temperature: 48°C, slightly heated to promote the reaction;

[0155] Electrolysis time: 2h;

[0156] Stirring speed: 300 rpm;

[0157] Start electrolysis. During the electrolysis process, H2O2 will decompose on the electrode surface to produce hydroxyl radicals, which will attack the surface of high-purity hexagonal boron nitride to form Figure 1 The hydroxylated h-BN nanosheets shown, while the electrolysis process promotes the exfoliation of hexagonal boron nitride;

[0158] 4) Post-processing

[0159] After the electrolysis, the solution was cooled to room temperature and ultrasonicated for 20 min to further disperse the nanosheets;

[0160] 5) Centrifugal separation

[0161] The first centrifugation: 3000 rpm, 15 min, to remove large particles;

[0162] The second centrifugation: 12000 rpm, 30 min, to collect hydroxylated h-BN nanosheets;

[0163] Centrifugation temperature: 10°C;

[0164] 6) Wash with deionized water and ethanol alternately 4 times;

[0165] 7) Freeze drying

[0166] The obtained nanosheets were placed in the freezer layer of a refrigerator and frozen overnight, and then placed in a freeze drying oven for 24 hours to obtain a dry white powder, which can be used to prepare a grinding fluid;

[0167] There is no particular order for step 1) and step 2).

[0168] A modified hexagonal boron nitride grinding fluid comprises the following components in percentage by mass:

[0169] Deionized water 60%;

[0170] Surfactant II 13%: polyvinyl pyrrolidone (PVP) 10%, sodium dodecylbenzene sulfonate (SDBS) 3%;

[0171] Polypropylene alcohol grinding aid 10%;

[0172] Modified hexagonal boron nitride nanosheets 10%;

[0173] pH adjuster II: Sodium hydroxide, used to adjust the pH of the solution to 10.

[0174] A method for preparing a modified hexagonal boron nitride grinding fluid comprises the following steps:

[0175] (1) Prepare the base liquid. Add deionized water to the stirrer, turn on the stirrer to maintain uniform stirring, then add surfactant II and continue stirring for 30 minutes until it is completely dissolved;

[0176] (2) pH adjustment. Gradually add pH adjuster II to the base solution to adjust the pH value to 10;

[0177] (3) Add grinding aid. Add the grinding aid to the base liquid and continue stirring for 30 minutes to ensure uniform dispersion;

[0178] (4) Add modified hexagonal boron nitride nanosheet powder. Slowly add the modified hexagonal boron nitride nanosheet powder into the base fluid, ensuring that it is evenly dispersed during the stirring process. The desired modified hexagonal boron nitride grinding fluid can be obtained and stored in a sealed container to avoid light and pollution to maintain its performance.

[0179] The rest is the same as in Example 1.

[0180] Comparative Example 1

[0181] The difference between this comparative example and Example 1 is that this comparative example uses commercially available grinding fluid to replace the modified hexagonal boron nitride grinding fluid in Example 1, and the rest is the same as Example 1.

[0182] The grinding fluid used in this comparative example is ceramic cutting fluid SH-826, material code TPR-003215, purchased from Hubei Daopu New Materials Co., Ltd.

[0183] Comparative Example 2

[0184] The difference between this comparative example and Example 1 is that this comparative example does not contain modified hexagonal boron nitride nanosheets.

[0185] The hexagonal boron nitride grinding fluid of this comparative example includes the following components in percentage by mass:

[0186] Deionized water 60%;

[0187] Surfactant II 13%: polyvinyl pyrrolidone (PVP) 10%, sodium dodecylbenzene sulfonate (SDBS) 3%;

[0188] Polypropylene alcohol grinding aid 10%:

[0189] pH adjuster II: Sodium hydroxide, used to adjust the pH of the solution to 7.

[0190] The rest is the same as in Example 1.

[0191] For the ZTA ceramic splitter, grinding was performed using the grinding fluids obtained in Example 1-2 and Comparative Example 1-2, respectively. The experimental results are as follows:

[0192] The grinding speed of comparative example 1 is 10s / pcs, and the surface roughness of the product is Ra=0.9μm.

[0193] The product of Comparative Example 2 is easy to break during the grinding process, and the surface roughness of the product is greater than 0.9 μm.

[0194] The grinding speed of Example 1 is increased by 2s / pcs compared with Comparative Example 1, and the surface roughness of the product Ra=0.8μm.

[0195] The grinding speed of Example 2 is increased by 3s / pcs compared with Comparative Example 1, and the surface roughness of the product Ra=0.5μm.

[0196] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0197] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing modified hexagonal boron nitride nanosheets, characterized in that: The modified hexagonal boron nitride nanosheets are hydroxylated h-BN nanosheets prepared by electrolysis; The preparation method of the modified hexagonal boron nitride nanosheets comprises the following steps: 1) Design of electrolyte The electrolyte includes a hydrogen peroxide solution; 2) Prepare electrode materials; 3) Setting electrolysis conditions and performing electrolysis; 4) After the electrolysis is completed, post-processing is performed; 5) Centrifugal separation; 6) Wash several times with solvent; 7) Freeze drying; Step 1) and step 2) are not prioritized; The electrode material includes an anode and a cathode, wherein the anode is a high-purity hexagonal boron nitride block electrode, and the cathode is a platinum electrode or a graphite electrode; The electrolysis conditions are: Electrolysis voltage: 15~25V; Current density: 30~50mA / cm 2 ; Electrolysis temperature: 40~50℃; Electrolysis time: 1~3h; Stirring speed: 300~400rpm; The post-processing steps are: After the electrolysis, the solution was cooled to room temperature and ultrasonically treated for 20-30 min.

2. The method for preparing a modified hexagonal boron nitride nanosheet according to claim 1, characterized in that: The electrolyte also includes at least one of an auxiliary electrolyte, a surfactant I, and a pH adjuster I; the auxiliary electrolyte is an ammonium sulfate solution, the surfactant I is sodium dodecyl sulfate, and the pH adjuster I is dilute sulfuric acid.

3. The method for preparing a modified hexagonal boron nitride nanosheet according to claim 1, characterized in that: The steps of centrifugation are: The first centrifugation: 3000±500rpm, 10~20min, to remove large particles; Second centrifugation: 12000±500rpm, 30~40min, to collect hydroxylated h-BN nanosheets; Centrifugation temperature: 4~10℃.

4. The method for preparing a modified hexagonal boron nitride nanosheet according to claim 1, characterized in that: In step 7), the obtained nanosheets are placed in the freezer layer of a refrigerator for one night, and then placed in a freeze drying oven for drying for 24 to 36 hours, and finally a dry white powder is obtained, which is the desired modified hexagonal boron nitride nanosheets.

5. A modified hexagonal boron nitride grinding fluid, characterized in that: The modified hexagonal boron nitride grinding fluid comprises the following components in percentage by mass: Deionized water 60~80%; Surfactant II 5~15%; 5-15% of the modified hexagonal boron nitride nanosheets prepared by the method for preparing modified hexagonal boron nitride nanosheets according to claim 1; Grinding aid 5~15%; Appropriate amount of pH adjuster II.

6. A method for preparing a modified hexagonal boron nitride grinding fluid, characterized in that: The following steps are involved: (1) Prepare the base fluid Add deionized water to the stirrer, turn on the stirrer to maintain uniform stirring, then add surfactant II and continue stirring for 20-30 minutes until it is completely dissolved; (2) Gradually add pH adjuster II to the base solution to adjust the pH value to 7-10; (3) Add the grinding aid to the base liquid and continue stirring for 30 to 60 minutes to ensure uniform dispersion; (4) Slowly add the modified hexagonal boron nitride nanosheets prepared by the preparation method of a modified hexagonal boron nitride nanosheet as described in claim 1 into the base liquid, ensuring that they are evenly dispersed during the stirring process, and the desired modified hexagonal boron nitride grinding fluid can be obtained. The fluid is stored in a sealed container to avoid light and pollution to maintain its performance.

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