A coated diamond composite abrasive and its preparation process

Abstract

The present invention discloses a coated diamond composite abrasive and its preparation process, which relates to the technical fields of abrasives and grinding tools. In order to improve the durability of diamond abrasives, the present invention conducts surface modification treatment on diamond abrasives. Molybdenum metal is mixed with diamond powder. Under the action of high-temperature salt bath, infiltration and carbonization will occur between molybdenum metal powder and diamond. And in this process, the tiny cracks of diamond will also be infiltrated and filled by molybdenum metal, thereby improving the mechanical properties of diamond particles. On this basis, the present invention introduces benzene ring, silane structure and epoxy group-terminated segments on the surface of diamond, so that the diamond abrasive can have good compatibility and bonding strength with epoxy resin-based consolidants, and can effectively reduce the phenomenon that diamond abrasives are easily detached due to heat generation during the use of diamond grinding tools, and further enhance the service life of diamond grinding tools.

Description

Technical Field

[0001] The present invention relates to the technical field of abrasives and grinding tools, and specifically to a coated diamond composite abrasive and its preparation process. Background Art

[0002] As the hardest known substance at present, diamond plays an important role in the abrasive and grinding tool industry. However, in some high-precision industries, such as the grinding process of silicon carbide wafers, although pure free diamond abrasives can also play a role in grinding and thinning, due to the inconsistent surface morphology of the free abrasives, they will show inconsistent distribution and movement during the grinding process. Therefore, when processing fine products, people often need to consolidate diamond into grinding tools before grinding the products.

[0003] However, diamond itself has poor wettability and often cannot be firmly combined with the consolidant and matrix. During use, diamond particles often peel off, resulting in a decrease in the grinding performance of the finally prepared grinding tool. Summary of the Invention

[0004] The purpose of the present invention is to provide a coated diamond composite abrasive and its preparation process to solve the problems raised in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A preparation process of a coated diamond composite abrasive, including the following steps:

[0006] S1. Disperse diamond powder into deionized water, heat it to boiling, stir and mix for 30 - 45 min, then filter. After washing the diamond powder with absolute ethanol again, heat it to 78 - 85 °C and dry it to constant weight. Then mix the dried diamond powder with molybdenum metal powder, and under a nitrogen atmosphere, ball mill and blend for 30 - 45 min. Then mix it with sodium chloride, protect it under an argon atmosphere, heat it to 810 - 980 °C, keep it warm for 30 - 90 min, cool it to room temperature, disperse the obtained product into deionized water, repeatedly wash to remove the sodium chloride therein, and dry the remaining product to constant weight to obtain heat-treated diamond powder.

[0007] S2. Disperse the heat-treated diamond powder into absolute ethanol, ultrasonic oscillate and disperse for 30 - 60 min, then add KH550 thereto, stir and mix evenly. Then add deionized water thereto, stir and react in the dark for 4 - 12 h, centrifuge to separate the precipitate, and dry it to constant weight to obtain amino-modified diamond powder.

[0008] S3. Under the protection of a nitrogen atmosphere, dissolve pyromellitic dianhydride in DMF, add p-chlorobenzenesulfonic acid thereto, continue to mix for 15 - 30 min, then add amino-modified diamond powder, ultrasonic disperse for 30 - 45 min, raise the temperature to 115 - 150 °C, stir and react for 1 - 4 h, centrifuge to separate the precipitate, wash the precipitate with DMF for 2 - 3 times, and dry to constant weight to obtain acid anhydride-modified diamond powder;

[0009] S4. Under the protection of a nitrogen atmosphere, disperse tris(oxiranylmethyl)benzene-1,3,5-tricarboxylate in DMF, add zinc chloride thereto, mix evenly, then add acid anhydride-modified diamond powder, ultrasonic disperse for 30 - 45 min, raise the temperature to 80 - 120 °C, stir and react for 4 - 8 h, centrifuge to separate the precipitate, wash with absolute ethanol for 3 - 5 times, and vacuum dry to constant weight to obtain coated diamond composite abrasive.

[0010] Further, in step S1, the particle size of the diamond powder is 1.5 - 30 μm; the particle size of the molybdenum metal powder is 1.5 - 10 μm.

[0011] Further, in step S1, by weight, the mass ratio of the diamond powder, molybdenum metal powder, and sodium chloride is 100:(0.8 - 1.5):(100 - 150).

[0012] Further, in step S2, by weight, the mass ratio of the heat-treated diamond powder, absolute ethanol, and KH550 is 1:(70 - 90):(8 - 30).

[0013] Further, in step S2, by weight, the mass ratio of the heat-treated diamond powder and deionized water is 1:(20 - 40).

[0014] Further, in step S3, by weight, the mass ratio of pyromellitic dianhydride, p-chlorobenzenesulfonic acid, and amino-modified diamond powder is (10 - 80):(0.005 - 0.01):1.

[0015] Further, in step S4, by weight, the mass ratio of tris(oxiranylmethyl)benzene-1,3,5-tricarboxylate, zinc chloride, and acid anhydride-modified diamond powder is (5 - 50):(0.001 - 0.15):1.

[0016] Further, a coated diamond composite abrasive is prepared by the above method.

[0017] Further, the coated diamond composite abrasive is applicable to diamond tools consolidated with epoxy resin.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In order to improve the durability of diamond abrasives, the present invention performs surface modification treatment on diamond abrasives. Since there are requirements for the particle size during the preparation of diamond abrasives, they are often obtained by crushing large diamond particles during the preparation process. This process often damages the microstructure of diamonds, resulting in a large number of tiny pores and cracks in diamond particles, causing the fragmentation and peeling of diamond particles during the grinding process. Therefore, the present invention first uses molybdenum metal powder to treat diamond powder. Under the action of high-temperature salt bath, molybdenum metal powder and diamond will infiltrate and carbonize. During this process, the tiny cracks in the diamond will also be infiltrated and filled by molybdenum metal, thereby improving the mechanical properties of diamond particles and avoiding fragmentation during the grinding process;

[0020] On this basis, the present invention also introduces aminosilane on the surface of diamond particles by hydrolyzing KH550. Then, the present invention further reacts pyromellitic dianhydride containing a large number of benzene ring structures with amino-modified diamond powder. After grafting segments containing both extremely heat-resistant benzene rings and silane structures on the diamond surface, it is reacted with tris(2,3-epoxypropyl)benzene-1,3,5-tricarboxylate with terminal epoxy groups, so that the surface of the diamond abrasives prepared by the present invention contains a large number of epoxy groups, which has good compatibility and bonding strength with epoxy resin-based consolidants, effectively improving the defect that diamond abrasives are prone to detachment after being prepared into grinding tools. And the benzene ring and silane structures introduced in this process can also effectively reduce the phenomenon that diamond abrasives are prone to detachment due to heat generation during the use of diamond grinding tools, further enhancing the service life of diamond grinding tools. Detailed implementation manners

[0021] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] The particle size of the diamond powder used in the examples and comparative examples of this application is 5 - 10 μm;

[0023] Example 1. A preparation process for coated diamond composite abrasives, comprising the following steps:

[0024] S1. By weight, disperse 1 part of diamond powder into 100 parts of deionized water. After heating to boiling and stirring for 30 min for mixing treatment, filter it. Then, wash the diamond powder with absolute ethanol again. After drying it to constant weight at 85 °C, mix the dried diamond powder with 0.008 part of molybdenum metal powder. Under a nitrogen atmosphere, ball-mill and blend for 30 min, then mix it with 100 parts of sodium chloride. Under the protection of an argon atmosphere, heat it to 850 °C, keep it warm for 60 min, and then cool it to room temperature. Disperse the obtained product into deionized water, wash it repeatedly to remove the sodium chloride therein, and then dry the remaining product to constant weight to obtain heat-treated diamond powder;

[0025] S2. By weight, disperse 1 part of heat-treated diamond powder into 80 parts of absolute ethanol. After ultrasonic dispersion for 60 min, add 10 parts of KH550 thereto. After stirring and mixing evenly, add 20 parts of deionized water thereto. After stirring and reacting in the dark for 8 h, centrifuge to separate the precipitate, and dry it to constant weight to obtain amino-modified diamond powder;

[0026] S3. Under the protection of a nitrogen atmosphere, by weight, dissolve 10 parts of pyromellitic dianhydride in DMF, add 0.01 part of p-chlorobenzenesulfonic acid thereto, continue to mix for 30 min, then add 1 part of amino-modified diamond powder thereto. After ultrasonic dispersion for 45 min, heat it to 130 °C, stir and react for 2 h, centrifuge to separate the precipitate, wash the precipitate with DMF three times, and then dry it to constant weight to obtain acid anhydride-modified diamond powder;

[0027] S4. Under the protection of a nitrogen atmosphere, by weight, disperse 5 parts of tris(oxiranylmethyl)benzene-1,3,5-tricarboxylate into DMF, add 0.1 part of zinc chloride thereto, mix evenly, add 1 part of acid anhydride-modified diamond powder thereto. After ultrasonic dispersion for 45 min, heat it to 85 °C, stir and react for 4 h, centrifuge to separate the precipitate, then wash it with absolute ethanol five times, and vacuum dry it to constant weight to obtain coated diamond composite abrasive.

[0028] Example 2. A preparation process of coated diamond composite abrasive, including the following steps:

[0029] Compared with Example 1, the addition amount of molybdenum metal powder in step S1 is increased in this example;

[0030] S1. By weight, disperse 1 part of diamond powder into 100 parts of deionized water. After heating to boiling and stirring for 30 min, filter it. Then wash the diamond powder with absolute ethanol again. After drying it to constant weight at 85 °C, mix the dried diamond powder with 0.015 parts of molybdenum metal powder. Under nitrogen atmosphere, ball-mill and blend for 30 min, then mix it with 100 parts of sodium chloride. Under argon atmosphere protection, heat it to 850 °C, hold for 60 min, and then cool it to room temperature. Disperse the obtained product into deionized water, wash it repeatedly to remove sodium chloride, and then dry the remaining product to constant weight to obtain heat-treated diamond powder;

[0031] S2. By weight, disperse 1 part of heat-treated diamond powder into 80 parts of absolute ethanol. After ultrasonic dispersion for 60 min, add 10 parts of KH550, stir and mix evenly, then add 20 parts of deionized water. After stirring and reacting for 8 h in the dark, centrifuge to separate the precipitate, and dry it to constant weight to obtain amino-modified diamond powder;

[0032] S3. Under nitrogen atmosphere protection, dissolve 10 parts of pyromellitic dianhydride in DMF, add 0.01 part of p-chlorobenzenesulfonic acid, continue to mix for 30 min, then add 1 part of amino-modified diamond powder. After ultrasonic dispersion for 45 min, heat it to 130 °C, stir and react for 2 h, centrifuge to separate the precipitate, wash the precipitate with DMF 3 times, and then dry it to constant weight to obtain acid anhydride-modified diamond powder;

[0033] S4. Under nitrogen atmosphere protection, by weight, disperse 5 parts of tris(oxiranylmethyl)benzene-1,3,5-tricarboxylate into DMF, add 0.1 part of zinc chloride, mix evenly, then add 1 part of acid anhydride-modified diamond powder. After ultrasonic dispersion for 45 min, heat it to 85 °C, stir and react for 4 h, centrifuge to separate the precipitate, wash it with absolute ethanol 5 times, and then vacuum dry it to constant weight to obtain coated diamond composite abrasive.

[0034] Example 3. A preparation process of coated diamond composite abrasive, comprising the following steps:

[0035] Compared with Example 2, the addition amount of KH550 in step S2 is increased in this example;

[0036] S1. By weight, disperse 1 part of diamond powder into 100 parts of deionized water. After heating to boiling and stirring for 30 min for mixing treatment, filter it. Then wash the diamond powder with anhydrous ethanol again. After drying it to constant weight at 85 °C, mix the dried diamond powder with 0.015 part of molybdenum metal powder. Under nitrogen atmosphere, ball-mill and blend for 30 min, then mix it with 100 parts of sodium chloride. Under argon atmosphere protection, heat it to 850 °C, keep it warm for 60 min, and then cool it to room temperature. Disperse the obtained product into deionized water, wash it repeatedly to remove the sodium chloride therein, and then dry the remaining product to constant weight to obtain heat-treated diamond powder;

[0037] S2. By weight, disperse 1 part of heat-treated diamond powder into 80 parts of anhydrous ethanol. After ultrasonic dispersion for 60 min, add 30 parts of KH550 thereto. After stirring and mixing evenly, add 20 parts of deionized water thereto. After stirring and reacting in the dark for 8 h, centrifuge to separate the precipitate and dry it to constant weight to obtain amino-modified diamond powder;

[0038] S3. By weight, under nitrogen atmosphere protection, dissolve 10 parts of pyromellitic dianhydride in DMF, add 0.01 part of p-chlorobenzenesulfonic acid thereto, continue to mix for 30 min, then add 1 part of amino-modified diamond powder thereto. After ultrasonic dispersion for 45 min, heat it to 130 °C, stir and react for 2 h, centrifuge to separate the precipitate, wash the precipitate with DMF for 3 times, and then dry it to constant weight to obtain acid anhydride-modified diamond powder;

[0039] S4. Under nitrogen atmosphere protection, by weight, disperse 5 parts of tris(oxiranylmethyl)benzene-1,3,5-tricarboxylate into DMF, add 0.1 part of zinc chloride thereto, mix evenly, add 1 part of acid anhydride-modified diamond powder thereto. After ultrasonic dispersion for 45 min, heat it to 85 °C, stir and react for 4 h, centrifuge to separate the precipitate, then wash it with anhydrous ethanol for 5 times, and vacuum dry it to constant weight to obtain coated diamond composite abrasive.

[0040] Example 4. A preparation process of coated diamond composite abrasive, comprising the following steps:

[0041] Compared with Example 3, the addition amount of pyromellitic anhydride in step S3 is increased in this example;

[0042] S1. By weight, disperse 1 part of diamond powder into 100 parts of deionized water. After heating to boiling and stirring for 30 min, filter it. Then wash the diamond powder with anhydrous ethanol again. After drying it to constant weight at 85 °C, mix the dried diamond powder with 0.015 parts of molybdenum metal powder. Under a nitrogen atmosphere, ball-mill and blend for 30 min, then mix it with 100 parts of sodium chloride. Under the protection of an argon atmosphere, heat it to 850 °C, hold for 60 min, and then cool it to room temperature. Disperse the obtained product into deionized water, wash it repeatedly to remove the sodium chloride, and then dry the remaining product to constant weight to obtain heat-treated diamond powder;

[0043] S2. By weight, disperse 1 part of heat-treated diamond powder into 80 parts of anhydrous ethanol. After ultrasonic dispersion for 60 min, add 30 parts of KH550, stir and mix evenly, then add 20 parts of deionized water, stir and react in the dark for 8 h, centrifuge to separate the precipitate, and dry it to constant weight to obtain amino-modified diamond powder;

[0044] S3. Under the protection of a nitrogen atmosphere, by weight, dissolve 80 parts of pyromellitic dianhydride in DMF, add 0.01 part of p-chlorobenzenesulfonic acid, continue to mix for 30 min, then add 1 part of amino-modified diamond powder, ultrasonic disperse for 45 min, heat to 130 °C, stir and react for 2 h, centrifuge to separate the precipitate, wash the precipitate with DMF 3 times, and dry it to constant weight to obtain acid anhydride-modified diamond powder;

[0045] S4. Under the protection of a nitrogen atmosphere, by weight, disperse 5 parts of tris(oxiranylmethyl)-1,3,5-benzenetricarboxylate in DMF, add 0.1 part of zinc chloride, mix evenly, add 1 part of acid anhydride-modified diamond powder, ultrasonic disperse for 45 min, heat to 85 °C, stir and react for 4 h, centrifuge to separate the precipitate, wash it with anhydrous ethanol 5 times, and vacuum dry it to constant weight to obtain coated diamond composite abrasive.

[0046] Example 5. A preparation process of coated diamond composite abrasive, including the following steps:

[0047] Compared with Example 4, this example increases the addition amount of tris(oxiranylmethyl)-1,3,5-benzenetricarboxylate in step S4;

[0048] S1. Disperse 1 part of diamond powder in 100 parts of deionized water by weight. After heating to boiling, stir and mix for 30 min, then filter. After washing the diamond powder with anhydrous ethanol again, heat it to 85 °C and dry it to constant weight. After that, mix the dried diamond powder with 0.015 parts of molybdenum metal powder. Under a nitrogen atmosphere, ball-mill and blend for 30 min, then mix it with 100 parts of sodium chloride. Under the protection of an argon atmosphere, heat it to 850 °C, keep it warm for 60 min, then cool it to room temperature. Disperse the obtained product in deionized water, repeatedly wash to remove the sodium chloride therein, and then dry the remaining product to constant weight to obtain heat-treated diamond powder;

[0049] S2. Disperse 1 part of heat-treated diamond powder in 80 parts of anhydrous ethanol by weight. After ultrasonic oscillation dispersion for 60 min, add 30 parts of KH550 thereto, stir and mix evenly, then add 20 parts of deionized water thereto. After stirring and reacting in the dark for 8 h, centrifuge to separate the precipitate, and dry it to constant weight to obtain amino-modified diamond powder;

[0050] S3. Under the protection of a nitrogen atmosphere, dissolve 80 parts of pyromellitic dianhydride in DMF by weight. After adding 0.01 part of p-chlorobenzenesulfonic acid thereto, continue to mix for 30 min, then add 1 part of amino-modified diamond powder thereto. After ultrasonic dispersion for 45 min, heat it to 130 °C, stir and react for 2 h, then centrifuge to separate the precipitate, wash the precipitate with DMF 3 times, and dry it to constant weight to obtain acid anhydride-modified diamond powder;

[0051] S4. Under the protection of a nitrogen atmosphere, disperse 50 parts of tris(oxiranylmethyl)benzene-1,3,5-tricarboxylate in DMF by weight. After adding 0.1 part of zinc chloride thereto and mixing evenly, add 1 part of acid anhydride-modified diamond powder thereto. After ultrasonic dispersion for 45 min, heat it to 85 °C, stir and react for 4 h, then centrifuge to separate the precipitate, wash it with anhydrous ethanol 5 times, and vacuum dry it to constant weight to obtain coated diamond composite abrasive.

[0052] Comparative Example 1. A preparation process of coated diamond composite abrasive includes the following steps:

[0053] Compared with Example 1, in this comparative example, only the diamond powder was boiled and washed in step S1;

[0054] S1. Disperse 1 part of diamond powder in 100 parts of deionized water by weight. After heating to boiling, stir and mix for 30 min, then filter. After washing the diamond powder with anhydrous ethanol again, heat it to 85 °C and dry it to constant weight to obtain heat-treated diamond powder;

[0055] S2. Disperse 1 part of heat-treated diamond powder into 80 parts of absolute ethanol by weight. After ultrasonic dispersion for 60 min, add 10 parts of KH550 thereto. After stirring and mixing evenly, add 20 parts of deionized water thereto. After stirring and reacting for 8 h in the dark, centrifuge to separate the precipitate. After drying to constant weight, amino-modified diamond powder is obtained.

[0056] S3. Under the protection of nitrogen atmosphere, dissolve 10 parts of pyromellitic dianhydride in DMF by weight. After adding 0.01 part of p-chlorobenzenesulfonic acid thereto, continue to mix for 30 min. Then add 1 part of amino-modified diamond powder thereto. After ultrasonic dispersion for 45 min, raise the temperature to 130 °C. After stirring and reacting for 2 h, centrifuge to separate the precipitate. Wash the precipitate 3 times with DMF and then dry to constant weight to obtain acid anhydride-modified diamond powder.

[0057] S4. Under the protection of nitrogen atmosphere, disperse 5 parts of tris(oxiranylmethyl)benzene-1,3,5-tricarboxylate into DMF by weight. Add 0.1 part of zinc chloride thereto. After mixing evenly, add 1 part of acid anhydride-modified diamond powder thereto. After ultrasonic dispersion for 45 min, raise the temperature to 85 °C. After stirring and reacting for 4 h, centrifuge to separate the precipitate. Wash the precipitate 5 times with absolute ethanol and then vacuum dry to constant weight to obtain coated diamond composite abrasive.

[0058] Comparative Example 2. A preparation process of coated diamond composite abrasive includes the following steps:

[0059] Compared with Example 1, only step S1 is carried out in this comparative example.

[0060] S1. Disperse 1 part of diamond powder into 100 parts of deionized water by weight. After raising the temperature to boiling, stir and mix for 30 min and then filter. After washing the diamond powder with absolute ethanol again, raise its temperature to 85 °C and dry to constant weight. Then mix the dried diamond powder with 0.008 part of molybdenum metal powder. Under nitrogen atmosphere, ball mill and blend for 30 min. Then mix it with 100 parts of sodium chloride. Under the protection of argon atmosphere, raise the temperature to 850 °C, keep the temperature for 60 min, and then cool to room temperature. Disperse the obtained product into deionized water, repeatedly wash to remove the sodium chloride therein, and then dry the remaining product to constant weight to obtain coated diamond composite abrasive.

[0061] Detection: By weight parts, 50 parts of bisphenol AE51 epoxy resin, 28 parts of thermosetting phenolic resin 2127, and 6 g of alumina auxiliary abrasive are mixed. After adding acetone to adjust the viscosity of the mixture to 90 mPa·s, after grouping, the coated diamond composite abrasives prepared in Examples 1-5 and Comparative Examples 1-2 are added thereto at an addition amount of 25 ct / mL, mixed evenly, and subjected to vacuum defoaming treatment. Then it is coated on a copper-plated high-carbon steel wire, heated to 300 °C and cured for 3 h to obtain a diamond wire saw for detection;

[0062] The diamond wire saws for detection prepared in Examples 1-5 and Comparative Examples 1-2 are respectively loaded onto an STX-402 cutting machine. Using a 3-inch silicon rod as the detection medium, controlling the effective cutting length of the wire saw to be 2.5 m and the cutting speed to be 2.5 m / s, the cutting speed of the silicon rod and the diamond detachment rate when a single wire saw breaks are respectively detected. The detection results are shown in the following table;

[0063]

[0064] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A process for preparing coated diamond composite abrasive, characterized in that: The following steps are involved: S1. The diamond powder is dispersed in deionized water, heated to boiling, stirred and mixed for 30-45 minutes, filtered, and washed with anhydrous ethanol again. The diamond powder is heated to 78-85 ° C and dried to constant weight. The dried diamond powder is mixed with molybdenum metal powder, ball-milled for 30-45 minutes under a nitrogen atmosphere, and then mixed with sodium chloride. The mixture is protected by an argon atmosphere and heated to 810-980 ° C. After holding for 30-90 minutes, the mixture is cooled to room temperature and the resulting product is dispersed in deionized water. After repeated washing to remove the sodium chloride, the remaining product is dried to constant weight to obtain a heat-treated diamond powder. S2. The heat-treated diamond powder was dispersed in anhydrous ethanol and ultrasonically dispersed for 30-60 min. Then, aminosilane KH550 was added thereto and mixed evenly. Deionized water was added thereto. The mixture was stirred in the dark for 4-12 h, and the precipitate was centrifuged and dried to constant weight to obtain amino-modified diamond powder. S3. Under nitrogen atmosphere, pyromellitic dianhydride was dissolved in DMF, p-chlorobenzenesulfonic acid was added thereto, and mixing was continued for 15-30 minutes. Then, amino-modified diamond powder was added thereto, and ultrasonic dispersion was performed for 30-45 minutes. The temperature was raised to 115-150°C, and the reaction was stirred for 1-4 hours. The precipitate was separated by centrifugation, washed with DMF 2-3 times, and dried to constant weight to obtain anhydride-modified diamond powder; S4. Under nitrogen atmosphere protection, tri(oxiranylmethyl)benzene-1,3,5-tricarboxylate was dispersed in DMF, zinc chloride was added thereto, and after mixing evenly, anhydride-modified diamond powder was added. After ultrasonic dispersion for 30-45 minutes, the temperature was raised to 80-120°C, and the reaction was stirred for 4-8 hours. After centrifugation and precipitation, the mixture was washed with anhydrous ethanol for 3-5 times and vacuum dried to constant weight to obtain a coated diamond composite abrasive.

2. The process for preparing a coated diamond composite abrasive according to claim 1, wherein: In step S1, the particle size of the diamond powder is 1.5-30 μm; the particle size of the molybdenum metal powder is 1.5-10 μm.

3. The process for preparing a coated diamond composite abrasive according to claim 1, wherein: In step S1, the mass ratio of the diamond powder to the molybdenum metal powder and the sodium chloride is 100:(0.8-1.5):(100-150) in parts by weight.

4. The process for preparing a coated diamond composite abrasive according to claim 1, wherein: In step S2, the mass ratio of the heat-treated diamond powder, anhydrous ethanol, and KH550 is 1:(70-90):(8-30) in parts by weight.

5. The process for preparing a coated diamond composite abrasive according to claim 1, characterized in that: In step S2, the mass ratio of the heat-treated diamond powder to deionized water is 1:(20-40) in parts by weight.

6. The process for preparing a coated diamond composite abrasive according to claim 1, wherein: In step S3, the mass ratio of the pyromellitic dianhydride, p-chlorobenzenesulfonic acid, and amino-modified diamond powder is (10-80): (0.005-0.01):1 in parts by weight.

7. The process for preparing a coated diamond composite abrasive according to claim 1, wherein: In step S4, the mass ratio of tri(oxiranylmethyl)benzene-1,3,5-tricarboxylate, zinc chloride, and anhydride-modified diamond powder is (5-50):(0.001-0.15):1 in parts by weight.

8. A coated diamond composite abrasive prepared by the preparation process according to any one of claims 1 to 7.

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