A polishing liquid for an aluminum-titanium composite material and a preparation method thereof

Abstract

The present invention relates to the technical field of polishing fluids, and specifically discloses a polishing fluid for aluminum-titanium composite materials and a preparation method thereof, comprising the following raw materials in parts by weight: 0.5-5 parts of diamond micropowder, 5-30 parts of silica sol, 0.5-2 parts of lubricant, 0.5-2 parts of surfactant, 0.1-5 parts of dispersant, 0.5-3 parts of modified silane coupling agent, and 50-90 parts of deionized water. The modified silane coupling agent has an alkyl long chain and a nitrogen heterocyclic group in its molecular structure, which together improve the properties such as suspension, polishing rate, and polishing quality of the polishing fluid for aluminum-titanium composite materials. The polishing fluid for aluminum-titanium composite materials prepared by the present invention can be widely used in the polishing treatment of the surface of aluminum-titanium composite materials and has broad application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of polishing liquid, and in particular to a polishing liquid for an aluminum-titanium composite material and a preparation method thereof. Background Art

[0002] Aluminum-titanium composite materials combine the lightweight properties of aluminum with the high strength and toughness of titanium, giving the material higher strength and toughness; in addition, it also has excellent corrosion resistance and wear resistance, and can maintain its performance stability in harsh environments. Therefore, it is widely used in aviation, aerospace, automobiles, and ships. However, these fields require aluminum-titanium composite materials to have good surface effects, and polishing is an important way to obtain excellent surface effects, eliminate surface defects, and increase service life. With the promotion and use of titanium-aluminum composite materials, various polishing liquids have also emerged.

[0003] The patent with publication number CN113136580B provides a reusable aluminum polishing liquid and its preparation method. The polishing liquid is composed of the following raw materials: 30-45% concentrated sulfuric acid, 35-45% concentrated phosphoric acid, 0.5-1.5% corrosion inhibitor, 1-3% tartaric acid, and the balance is water. The corrosion inhibitor is composed of carboxymethyl cellulose and sulfosalicylic acid. The polishing method used is: degreasing the aluminum alloy workpiece, washing the workpiece with water, and then placing it in the polishing liquid for polishing, then washing it with water, washing it with anhydrous ethanol, and then drying it to obtain the polished aluminum alloy workpiece. The aluminum alloy workpiece is polished with the polishing liquid of the application, and the surface roughness and glossiness of the aluminum alloy workpiece are both good; the weight loss rate of the aluminum alloy workpiece is low, and the size of the aluminum alloy workpiece is almost not affected; the used polishing liquid is chemically precipitated to remove aluminum ions, and the polishing liquid with aluminum ions removed can be reused again. However, the concentrated sulfuric acid and concentrated phosphoric acid contained in the polishing liquid have strong irritation and corrosion effects on human skin, eyes and other tissues. The acid mist or steam generated during the polishing process will damage the respiratory system of the operator. Moreover, if the waste liquid generated after the use of the polishing liquid is not properly handled, it will also pollute the environment. The patent with publication number CN117888111B provides a titanium alloy polishing liquid and a polishing method thereof. The titanium alloy polishing liquid is composed of the following components: a biological acid liquid with a mass fraction of 94-98% and coconut shell activated carbon particles with a diameter of 0.5 mm to make up the balance. The invention uses organic acids extracted from the pulp of the thorny yellow fruit to corrode and remove the oxide layer on the surface of the titanium alloy and reduce the roughness. Its own oxidizing property will form a passivation oxide film to avoid excessive corrosion; phenolic and ketone compounds with antioxidant properties extracted from tea leaves control the oxidation rate of organic acids while protecting the activity of organic acids extracted from the pulp of the thorny yellow fruit. In addition, biopolysaccharides such as cellulose in the biological acid liquid will act as a dispersant to improve the stability of the polishing liquid system. However, the biomass acid polishing liquid contains acidic substances, which will corrode the polishing equipment. This corrosiveness may cause equipment damage, shorten service life and reduce polishing quality.

[0004] Therefore, it is of great significance to develop an aluminum-titanium composite polishing liquid with excellent dispersibility, polishing rate and polishing effect. Summary of the invention

[0005] The purpose of the present invention is to provide a polishing liquid for aluminum-titanium composite materials and a preparation method thereof in view of the deficiencies in the prior art. The polishing liquid for aluminum-titanium composite materials prepared by the present invention has excellent polishing efficiency and polishing effect and has good dispersibility.

[0006] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0007] A polishing liquid for aluminum-titanium composite material comprises the following raw materials in parts by weight: 0.5-5 parts of diamond micropowder, 5-30 parts of silica sol, 0.5-2 parts of lubricant, 0.5-2 parts of surfactant, 0.1-5 parts of dispersant, 0.5-3 parts of modified silane coupling agent, and 50-90 parts of deionized water. The preparation method of the modified silane coupling agent is as follows:

[0008] Step S1, adding silane coupling agent KH-560, stearic acid and chromium isooctanoate to toluene at 70-80° C. with stirring, reacting for 3-5 hours, cooling to room temperature, and purifying to obtain an intermediate;

[0009] Step S2, adding the intermediate obtained in step S1, aluminum chloride and 5-carboxybenzotriazole to N,N-dimethylformamide at 100-110° C. with stirring, reacting for 4-6 hours, cooling to room temperature, and purifying to obtain a modified silane coupling agent;

[0010] The synthetic route of modified silane coupling agent is as follows:

[0011] ;

[0012] .

[0013] Furthermore, the lubricant is one or more of propylene glycol, glycerol, diethylene glycol, and ethylene glycol.

[0014] Furthermore, the surfactant is one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium N-oleoyl-N-methyl taurate, and polyethylene glycol.

[0015] Furthermore, the dispersant is one or more of sodium metasilicate, sodium hexametaphosphate, sodium oleate, sodium citrate, and polyvinyl alcohol.

[0016] Furthermore, in step S1, the mass ratio of the silane coupling agent KH-560, stearic acid and chromium isooctanoate is 1:1-1.5:0.03-0.06, and the amount of the silane coupling agent KH-560 added to toluene is 0.05-0.07 g / mL.

[0017] Furthermore, in step S2, the mass ratio of the intermediate, aluminum chloride and 5-carboxybenzotriazole is 1:0.2-0.4:0.01-0.03, and the amount of the intermediate added to N,N-dimethylformamide is 0.02-0.05 g / mL.

[0018] The present invention also provides a method for preparing a polishing liquid for an aluminum-titanium composite material, comprising the following steps:

[0019] (1) At room temperature, add diamond powder to part of deionized water, then add dispersant, and ultrasonicate for 0.5-1h at a power of 500w to obtain an abrasive solution;

[0020] (2) Add the remaining deionized water, lubricant, surfactant, modified silane coupling agent and silica sol to the abrasive solution obtained in step (1) in sequence, and stir for 1-3 hours to obtain the product.

[0021] Furthermore, in step (1), the mass ratio of diamond to partially deionized water is 1:5-10.

[0022] The present invention selects diamond as the main component of the polishing liquid for aluminum-titanium composite materials. Diamond polishing liquid is widely used in the grinding and polishing process of various hard materials, such as sapphire, optical crystal, hard glass, superhard ceramics, alloy, chip, etc. These materials have broad application prospects in the fields of electronics, optics, aerospace, etc., and diamond polishing liquid is an important auxiliary material in the processing of these materials, which is of great significance for improving product quality and processing efficiency. The abrasive of diamond polishing liquid is mainly diamond micropowder, and diamond micropowder sometimes has a poor dispersion stability, resulting in easy agglomeration and precipitation of particles, which will affect the uniformity and polishing effect of the polishing liquid. It is necessary to fully stir and disperse during use to ensure that the polishing liquid can act evenly on the workpiece surface. Therefore, improving the dispersibility of diamond polishing liquid is of great significance for improving polishing efficiency, optimizing polishing surface quality, extending the service life of polishing liquid, and widening the application field, and when preparing the polishing liquid for aluminum-titanium composite materials, it is necessary to avoid introducing elements such as sulfur, phosphorus, and chlorine to reduce the harm to the environment.

[0023] The present invention has the following beneficial effects:

[0024] The present invention adopts a chemical modification method to prepare a modified silane coupling agent, and then compound the modified silane coupling agent with raw materials such as diamond micropowder to obtain a polishing liquid for aluminum-titanium composite materials with excellent performance. The synthesis of the modified silane coupling agent first introduces a long-chain alkyl group of stearic acid through a ring-opening reaction between the carboxyl group of stearic acid and the epoxy group of the silane coupling agent KH-560, thereby obtaining an intermediate containing a hydroxyl group; and then obtains a modified silane coupling agent through an esterification reaction between the hydroxyl group of the intermediate and the carboxyl group of 5-carboxybenzotriazole, wherein the modified silane coupling agent contains a long-chain alkyl group and a nitrogen heterocyclic group in its structure. The long-chain alkyl group will form a steric hindrance layer around abrasive particles such as diamond micropowder, which enables the silane coupling agent to effectively prevent the agglomeration phenomenon between abrasive particles, helps to ensure that the polishing liquid maintains stable performance during the polishing process, and thus improves the consistency and uniformity of the polishing. In addition, the long-chain alkyl group also has a certain lipophilicity, which enables the modified silane coupling agent to effectively remove oil and impurities on the surface of the aluminum-titanium composite material during the polishing process, ensuring that the surface of the aluminum-titanium composite material is cleaner, thereby improving the polishing quality; in addition, the nitrogen heterocyclic group contains nitrogen-nitrogen bonds, which are easy to combine with free electrons on the surfaces of metals such as aluminum and titanium to form metal complexes, so that the modified silane coupling agent can eliminate oxides on the metal surface, fill the pits and flaws on the surface, and then make the surface of the aluminum-titanium composite material smoother; the nitrogen heterocyclic compound can also form a hydrophobic immersion layer on the metal surface, which can block the small holes and slits originally existing on the surface of the aluminum-titanium composite material, reduce the friction of the surface, and thus improve the surface finish of the aluminum-titanium composite material, and the modified silane coupling agent containing the nitrogen heterocyclic group also has a synergistic effect with the dispersant, lubricant and other components in the polishing liquid, thereby enhancing the polishing rate and polishing quality of the polishing liquid.

[0025] The present invention compounds raw materials such as diamond micropowder, silica sol, lubricant, surfactant, dispersant, modified silane coupling agent, etc. to obtain polishing liquid for aluminum-titanium composite materials, wherein the modified silane coupling agent can improve the compatibility of polishing liquid abrasives such as diamond micropowder and organic additives, and it can build a bridge between inorganic materials and organic materials, so that they can better combine and interact with each other, thereby improving the overall performance of the polishing liquid, improving the stability and dispersibility of the polishing liquid, and ensuring that the polishing liquid can act on the material surface uniformly and stably during use. The polishing liquid for aluminum-titanium composite materials prepared by the present invention has good dispersibility, is not easy to agglomerate, is helpful to extend the service life of the polishing liquid, and has excellent polishing rate and polishing quality, so that the polishing liquid has a wide range of application prospects. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] The raw materials used in the following examples are all common commercial products. Diamond powder is polycrystalline diamond powder with a particle size of 40-60 nm; the particle size of silica sol in silica sol is 10-150 nm, and the solid content is 20%-50%; polyethylene glycol is PEG-600; the degree of polymerization of polyvinyl alcohol is 120000-150000, and the degree of alcoholysis is 87-89%.

[0028] Example 1

[0029] A polishing liquid for aluminum-titanium composite material, comprising the following raw materials in parts by weight: 0.5 parts of diamond micropowder, 30 parts of silica sol, 0.5 parts of lubricant, 0.5 parts of surfactant, 5 parts of dispersant, 0.5 parts of modified silane coupling agent, and 50 parts of deionized water;

[0030] The lubricant is propylene glycol, the surfactant is sodium lauryl sulfate, and the dispersant is sodium metasilicate;

[0031] The preparation method of the modified silane coupling agent is as follows:

[0032] Step S1, adding 1 g of silane coupling agent KH-560, 1 g of stearic acid and 0.03 g of chromium isooctanoate to 20 mL of toluene at 70° C. with stirring, reacting for 5 h, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate to remove toluene at a temperature of 60° C., a rotation rate of 120 rpm and a vacuum degree of -0.08-0.1 MPa to obtain an intermediate;

[0033] Step S2, adding 1 g of the intermediate obtained in step S1, 0.2 g of aluminum chloride and 0.01 g of 5-carboxybenzotriazole to 50 mL of N,N-dimethylformamide at 100° C. with stirring, reacting for 6 h, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate at a temperature of 80° C., a rotation rate of 120 rpm and a vacuum degree of 25-50 mbar to remove N,N-dimethylformamide to obtain a modified silane coupling agent;

[0034] The synthetic route of modified silane coupling agent is as follows:

[0035] ;

[0036] .

[0037] The NMR results of the modified silane coupling agent are: 1 H NMR (300MHz, acetone-d6) δ 16.16 (s, 1H), 8.71 (s, 1H), 8.18 (s, 1H), 8.07 (s, 1H), 5.46 (s, 1H), 4.36-4.61 (m, 2H), 3.65-3.9 (m, 2H), 3.55 (s, 9 H), 3.35 (t, 2H), 2.32 (t, 2H), 1.58-1.69 (m, 2H), 1.33-1.42 (m, 4H), 1.26-1.30 (m, 26H), 0.88 (t, 3H), 0.56 (t, 2H).

[0038] A method for preparing a polishing liquid for an aluminum-titanium composite material comprises the following steps:

[0039] (1) At room temperature, add diamond powder to part of deionized water, then add dispersant, and ultrasonicate for 0.5 h at a power of 500 W to obtain an abrasive solution with a mass ratio of diamond to deionized water of 1:10;

[0040] (2) Add the remaining deionized water, lubricant, surfactant, modified silane coupling agent and silica sol to the abrasive solution obtained in step (1) in sequence, and stir for 1 hour to obtain the product.

[0041] Example 2

[0042] A polishing liquid for aluminum-titanium composite material, comprising the following raw materials in parts by weight: 5 parts of diamond micropowder, 5 parts of silica sol, 2 parts of lubricant, 2 parts of surfactant, 0.1 parts of dispersant, 3 parts of modified silane coupling agent, and 90 parts of deionized water;

[0043] The lubricant is glycerol, the surfactant is sodium dodecylbenzene sulfonate, and the dispersant is sodium hexametaphosphate;

[0044] The preparation method of the modified silane coupling agent is as follows:

[0045] Step S1, adding 1 g of silane coupling agent KH-560, 1.5 g of stearic acid and 0.06 g of chromium isooctanoate to 14.29 mL of toluene at 80° C. with stirring, reacting for 3 h, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate to remove toluene at a temperature of 60° C., a rotation rate of 120 rpm and a vacuum degree of -0.08-0.1 MPa to obtain an intermediate;

[0046] Step S2, adding 1 g of the intermediate obtained in step S1, 0.4 g of aluminum chloride and 0.03 g of 5-carboxybenzotriazole to 20 mL of N,N-dimethylformamide at 110° C. with stirring, reacting for 4 h, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate at a temperature of 80° C., a rotation rate of 120 rpm and a vacuum degree of 25-50 mbar to remove N,N-dimethylformamide to obtain a modified silane coupling agent;

[0047] A method for preparing a polishing liquid for an aluminum-titanium composite material comprises the following steps:

[0048] (1) At room temperature, add diamond powder to part of deionized water, then add dispersant, and ultrasonicate for 1 hour at a power of 500 W to obtain an abrasive solution with a mass ratio of diamond to deionized water of 1:5;

[0049] (2) Add the remaining deionized water, lubricant, surfactant, modified silane coupling agent and silica sol to the abrasive solution obtained in step (1) in sequence, and stir for 3 hours to obtain the product.

[0050] Example 3

[0051] A polishing liquid for aluminum-titanium composite material, comprising the following raw materials in parts by weight: 2 parts of diamond micropowder, 20 parts of silica sol, 1 part of lubricant, 1 part of surfactant, 3 parts of dispersant, 2 parts of modified silane coupling agent, and 70 parts of deionized water;

[0052] The lubricant is ethylene glycol, the surfactant is polyethylene glycol, and the dispersant is polyvinyl alcohol;

[0053] The preparation method of the modified silane coupling agent is as follows:

[0054] Step S1, adding 1 g of silane coupling agent KH-560, 1.3 g of stearic acid and 0.05 g of chromium isooctanoate to 16.67 mL of toluene at 75° C. with stirring, reacting for 4 h, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate to remove toluene at a temperature of 60° C., a rotation rate of 120 rpm and a vacuum degree of -0.08-0.1 MPa to obtain an intermediate;

[0055] Step S2, adding 1 g of the intermediate obtained in step S1, 0.3 g of aluminum chloride and 0.02 g of 5-carboxybenzotriazole to 25 mL of N,N-dimethylformamide at 105° C. with stirring, reacting for 5 h, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate at a temperature of 80° C., a rotation rate of 120 rpm and a vacuum degree of 25-50 mbar to remove N,N-dimethylformamide to obtain a modified silane coupling agent;

[0056] A method for preparing a polishing liquid for an aluminum-titanium composite material comprises the following steps:

[0057] (1) At room temperature, add diamond powder to part of deionized water, then add dispersant, and ultrasonicate for 0.7 h at a power of 500 W to obtain an abrasive solution with a mass ratio of diamond to deionized water of 1:8;

[0058] (2) Add the remaining deionized water, lubricant, surfactant, modified silane coupling agent and silica sol to the abrasive solution obtained in step (1) in sequence, and stir for 2 hours to obtain the product.

[0059] Comparative Example 1

[0060] A polishing liquid for aluminum-titanium composite material, comprising the following raw materials in parts by weight: 0.4 parts of diamond micropowder, 20 parts of silica sol, 0.5 parts of lubricant, 0.1 parts of surfactant, 0.1 parts of dispersant, 2 parts of modified silane coupling agent, and 70 parts of deionized water;

[0061] The lubricant is ethylene glycol, the surfactant is polyethylene glycol, and the dispersant is polyvinyl alcohol;

[0062] The preparation method of the modified silane coupling agent is as follows: 1 g of silane coupling agent KH-560, 1.3 g of stearic acid and 0.05 g of chromium isooctanoate are added to 16.67 mL of toluene at 75° C. under stirring conditions, reacting for 4 hours, cooling to room temperature and filtering to obtain a filtrate, then rotary evaporating the filtrate to remove toluene at a temperature of 60° C., a rotation rate of 120 rpm and a vacuum degree of -0.08-0.1 MPa to obtain a modified silane coupling agent;

[0063] A method for preparing a polishing liquid for an aluminum-titanium composite material comprises the following steps:

[0064] (1) At room temperature, add diamond powder to part of deionized water, then add dispersant, and ultrasonicate for 0.7 h at a power of 500 W to obtain an abrasive solution with a mass ratio of diamond to deionized water of 1:8;

[0065] (2) Add the remaining deionized water, lubricant, surfactant, modified silane coupling agent and silica sol to the abrasive solution obtained in step (1) in sequence, and stir for 2 hours to obtain the product.

[0066] Comparative Example 2

[0067] A polishing liquid for an aluminum-titanium composite material comprises the following raw materials in parts by weight: 2 parts of diamond micropowder, 3 parts of silica sol, 1 part of lubricant, 3 parts of surfactant, 0.1 part of dispersant, 2 parts of silane coupling agent KH-560, and 70 parts of deionized water;

[0068] The lubricant is ethylene glycol, the surfactant is polyethylene glycol, and the dispersant is polyvinyl alcohol;

[0069] A method for preparing a polishing liquid for an aluminum-titanium composite material comprises the following steps:

[0070] (1) At room temperature, add diamond powder to part of deionized water, then add dispersant, and ultrasonicate for 0.7 h at a power of 500 W to obtain an abrasive solution with a mass ratio of diamond to deionized water of 1:8;

[0071] (2) Add the remaining deionized water, lubricant, surfactant, silane coupling agent KH-560 and silica sol to the abrasive solution obtained in step (1) in sequence, and stir for 2 hours to obtain the product.

[0072] Comparative Example 3

[0073] A polishing liquid for aluminum-titanium composite material, comprising the following raw materials in parts by weight: 2 parts of diamond micropowder, 10 parts of silica sol, 1 part of lubricant, 0.5 parts of surfactant, 1 part of dispersant, and 70 parts of deionized water;

[0074] The lubricant is ethylene glycol, the surfactant is polyethylene glycol, and the dispersant is polyvinyl alcohol;

[0075] A method for preparing a polishing liquid for an aluminum-titanium composite material comprises the following steps:

[0076] (1) At room temperature, add diamond powder to part of deionized water, then add dispersant, and ultrasonicate for 0.7 h at a power of 500 W to obtain an abrasive solution with a mass ratio of diamond to deionized water of 1:8;

[0077] (2) Add the remaining deionized water, lubricant, surfactant and silica sol to the abrasive solution obtained in step (1) in sequence, and stir for 2 hours to obtain the product.

[0078] The performance of the polishing liquid for the aluminum-titanium composite material prepared in Examples 1-3 and Comparative Examples 1-3 was tested. The test method is as follows. The test results are shown in Table 1 below.

[0079] The aluminum-titanium composite material was polished using the polishing liquids prepared in Examples 1-3 and Comparative Examples 1-3, respectively. During the polishing process, the pressure was 300 g / cm, the polishing disc speed was 70 r / min, the polishing liquid flow rate was 4 mL / min, the temperature was 25-30°C, and the time was 60 min.

[0080] (1) Polishing rate

[0081] The polishing rate is tested by a wafer tester, that is, polishing rate = removal amount before and after polishing / polishing time, and the removal amount before and after polishing is the mass difference of the aluminum-titanium composite material before and after polishing.

[0082] (2) Surface roughness

[0083] A total of 5 points were selected, including the periphery and center of the aluminum-titanium composite material polished with the polishing liquid prepared in each embodiment and comparative example, and tested using a surface roughness meter. The roughness of the 5 points was tested separately, and each point was measured 3 times to take the average roughness value.

[0084] (3) Suspension stability

[0085] The polishing liquid for aluminum-titanium composite material was stored at room temperature away from light, and the stratification of the polishing liquid for aluminum-titanium composite material prepared in each embodiment and comparative example was examined respectively, so as to examine its suspension stability.

[0086] (4) Scratching degree

[0087] The number of scratches was observed under a microscope at a magnification of five times, and five locations around and in the center of the polished aluminum-titanium composite material were selected for observation, and the average number was finally taken.

[0088] Table 1 Application performance test of each polishing liquid

[0089]

[0090] It can be seen from the data in Table 1 that the polishing liquid for aluminum-titanium composite materials prepared in Examples 1-3 has good dispersibility, and the particles are not easy to aggregate into agglomerates, and are not easy to precipitate after long-term storage, so the service life of the polishing liquid can be extended, thereby reducing the waste and replacement frequency of the polishing liquid; the aluminum-titanium composite material polishing liquid prepared in Examples 1-3 and Comparative Examples 1-3 is used to polish the aluminum-titanium composite material, and it can be seen from Table 1 that the polishing liquid prepared in Examples 1-3 has a high polishing efficiency, which can reduce the polishing cost and improve the product quality; the surface roughness of the material obtained after the polishing treatment is low, the number of scratches is small, and the quality of the polished surface is effectively improved, the overall aesthetics and durability of the material are improved, and surface scratches are avoided while improving the polishing efficiency. In addition, the polishing liquid does not contain elements such as sulfur, phosphorus, and chlorine, which helps to improve air quality, protect water resources and soil health, etc.

[0091] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0092] Although the embodiments of the present application 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 application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A polishing liquid for aluminum-titanium composite material, characterized in that: The raw materials include the following parts by weight: 0.5-5 parts of diamond powder, 5-30 parts of silica sol, 0.5-2 parts of lubricant, 0.5-2 parts of surfactant, 0.1-5 parts of dispersant, 0.5-3 parts of modified silane coupling agent, and 50-90 parts of deionized water. The preparation method of the modified silane coupling agent is as follows: Step S1, adding silane coupling agent KH-560, stearic acid and chromium isooctanoate to toluene at 70-80° C. with stirring, reacting for 3-5 hours, cooling to room temperature, and purifying to obtain an intermediate, the structural formula of the intermediate is: ； Step S2, adding the intermediate obtained in step S1, aluminum chloride and 5-carboxybenzotriazole to N,N-dimethylformamide at 100-110° C. with stirring, reacting for 4-6 hours, cooling to room temperature, and purifying to obtain a modified silane coupling agent, the structural formula of the modified silane coupling agent is: 。 2. The polishing liquid for aluminum-titanium composite material according to claim 1, characterized in that: The lubricant is one or more of propylene glycol, glycerol, diethylene glycol and ethylene glycol.

3. The polishing liquid for aluminum-titanium composite material according to claim 1, characterized in that: The surfactant is one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium N-oleoyl-N-methyl taurate, and polyethylene glycol.

4. The polishing liquid for aluminum-titanium composite material according to claim 1, characterized in that: The dispersant is one or more of sodium metasilicate, sodium hexametaphosphate, sodium oleate, sodium citrate and polyvinyl alcohol.

5. The polishing liquid for aluminum-titanium composite material according to claim 1, characterized in that: The mass ratio of the silane coupling agent KH-560, stearic acid and chromium isooctanoate in step S1 is 1:1-1.5:0.03-0.06, and the amount of the silane coupling agent KH-560 added to toluene is 0.05-0.07 g / mL.

6. The polishing liquid for aluminum-titanium composite material according to claim 1, characterized in that: The mass ratio of the intermediate, aluminum chloride and 5-carboxybenzotriazole in step S2 is 1:0.2-0.4:0.01-0.03, and the amount of the intermediate added to N,N-dimethylformamide is 0.02-0.05 g / mL.

7. The method for preparing a polishing liquid for an aluminum-titanium composite material according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) At room temperature, add diamond powder to part of deionized water, then add dispersant, and ultrasonicate for 0.5-1h at a power of 500w to obtain an abrasive solution; (2) Add the remaining deionized water, lubricant, surfactant, modified silane coupling agent and silica sol to the abrasive solution obtained in step (1) in sequence, and stir for 1-3 hours to obtain the product.

8. The method for preparing a polishing liquid for an aluminum-titanium composite material according to claim 7, characterized in that: In step (1), the mass ratio of diamond to part of deionized water is 1:5-10.

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