A grinding fluid, its preparation method and application

Abstract

This invention discloses a polishing slurry, its preparation method, and its application. The raw materials for preparation include: an organic acid, an abrasive, an abrasive protectant, and a matting agent. The organic acid includes at least one selected from sulfosalicylic acid and sulfosuccinic acid. The abrasive includes plate-shaped alumina. The abrasive protectant includes at least one selected from acetylated distarch phosphate and hydroxypropyl distarch phosphate. The matting agent includes at least one selected from N,N'-methylenebismorpholine and 4,4'-(1,2-ethylidene)bismorpholine. This invention provides a polishing slurry that results in a uniform matte finish on the surface of polished aluminum alloys.

Description

Technical Field

[0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a grinding liquid and a preparation method and application thereof. Background Art

[0002] In the process of aluminum alloy processing, in order to obtain the frosted texture of the aluminum alloy surface, the aluminum alloy surface is usually matte treated. Matt surface treatment is mainly a surface treatment process that forms a rough, dark black layer on the aluminum alloy surface without visible texture effects by grinding. The grinding fluid used in conventional grinding cannot obtain an aluminum alloy surface with uniform color and matte effect.

[0003] Therefore, it is urgent to develop an aluminum alloy matte surface grinding liquid that makes the aluminum alloy after grinding present a uniform matte surface effect. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a method for preparing a grinding liquid and an application thereof, so that the surface of the aluminum alloy after grinding presents a uniform matte effect.

[0005] The second aspect of the present invention provides a method for preparing the above-mentioned grinding liquid.

[0006] The third aspect of the present invention provides a use of the above-mentioned grinding liquid in the surface treatment of aluminum alloy.

[0007] According to a first aspect of the present invention, a grinding liquid is prepared by raw materials including: organic acid, abrasive, abrasive protective agent and matte agent;

[0008] The organic acid comprises at least one of sulfosalicylic acid and sulfosuccinic acid;

[0009] The abrasive material includes plate-like aluminum oxide;

[0010] The abrasive protective agent comprises at least one of acetylated distarch phosphate and hydroxypropyl distarch phosphate;

[0011] The matte agent includes at least one of N,N'-methylenebismorpholine and 4,4'-(1,2-ethylene)bismorpholine.

[0012] The embodiments of the first aspect of the present invention have at least the following beneficial effects:

[0013] The sulfosalicylic acid and sulfosuccinic acid of the present invention contain sulfonic acid groups and carboxylic acid groups, so that the grinding liquid has a strong chemical corrosion effect on the aluminum alloy, and does not cause pitting, so that the surface morphology of the aluminum alloy after grinding is uniform and has a matte effect. The abrasive in the present invention adopts plate-shaped aluminum oxide, which is different from the equal-area or spherical shape of traditional abrasives, but is in the shape of a round cake. This shape makes the abrasive particles parallel to the surface of the workpiece being processed during the grinding movement, producing a sliding grinding effect, rather than the rolling grinding of traditional abrasives, so it is not easy to cause random scratches on the surface of the workpiece.

[0014] The function of the abrasive protective agent is to prevent the corrosion of the plate-like aluminum oxide by organic acids during the storage of the grinding liquid, while not affecting the corrosion of the aluminum substrate surface by organic acids. The acetylated distarch phosphate or hydroxypropyl distarch phosphate used in the present invention forms a dense protective film invisible to the naked eye on the surface of the plate-like aluminum oxide, thereby preventing the abrasive from being corroded by organic acids.

[0015] The function of matte agent is to make the surface of aluminum alloy after grinding appear dark black. Without adding matte agent, the surface of aluminum alloy after grinding appears white mist, so there is no matte frosted texture.

[0016] According to some embodiments of the present invention, the particle size D50 of the abrasive is 15-35 um.

[0017] Grinding is a processing technology that combines chemical corrosion and mechanical removal. The size of the abrasive directly affects the mechanical removal effect. If it is too coarse, the processed surface will be scratched, and if it is too fine, the removal efficiency will be affected.

[0018] According to some embodiments of the present invention, the grinding liquid includes 0.5 to 2 parts of the organic acid and 10 to 30 parts of the abrasive.

[0019] According to some embodiments of the present invention, the grinding liquid includes 0.5 to 2 parts of the organic acid and 0.5 to 2 parts of the abrasive protective agent.

[0020] According to some embodiments of the present invention, the polishing liquid includes 0.5 to 2 parts of the organic acid and 1 to 3 parts of the matte agent.

[0021] According to some embodiments of the present invention, the raw materials for preparing the grinding liquid also include water.

[0022] According to some embodiments of the present invention, the polishing liquid includes, by weight, 0.5 to 2 parts of the organic acid, 10 to 30 parts of the abrasive, 0.5 to 2 parts of the abrasive protective agent, 1 to 3 parts of the matte agent and 65 to 85 parts of water.

[0023] According to a second aspect of the present invention, an embodiment provides a method for preparing the grinding liquid, comprising dispersing the organic acid, the abrasive protective agent and the matte agent, and then adding the abrasive to mix.

[0024] According to some embodiments of the present invention, the dispersion temperature is 25-35°C.

[0025] According to some embodiments of the present invention, the dispersing includes dispersing by stirring.

[0026] According to some embodiments of the present invention, the dispersion time is 20-30 minutes.

[0027] According to some embodiments of the present invention, the stirring rate of the stirring and dispersing is 40-60 r / min.

[0028] According to some embodiments of the present invention, the mixing temperature is 25-35°C.

[0029] According to some embodiments of the present invention, the mixing includes stirring and mixing.

[0030] According to some embodiments of the present invention, the mixing time is 20-30 minutes.

[0031] According to some embodiments of the present invention, the stirring rate of the stirring mixing is 40-60 r / min.

[0032] According to some embodiments of the present invention, the method for preparing the polishing liquid comprises adding the organic acid, the abrasive protective agent and the matte agent into water, and after dissolving them, adding the abrasive and mixing.

[0033] According to a third aspect of the present invention, an embodiment provides a use of the grinding liquid in aluminum alloy surface treatment.

[0034] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the concept of the present invention and the technical effects produced in combination with the embodiments, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. The test methods used in the embodiments are conventional methods unless otherwise specified; the materials, reagents, etc. used, unless otherwise specified, can be reagents and materials obtained from commercial channels. Unless otherwise specified, the same components of each embodiment and comparative example are purchased from the same batch of the same manufacturer; the corresponding parameters are the same as those in Example 1 unless otherwise specified.

[0036] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0037] Example 1

[0038] This embodiment provides an aluminum alloy matte surface polishing liquid, which is composed of the following components by weight:

[0039]

[0040] The plate-like alumina (particle size D50 is 25 um) is a plate-like alumina produced by Wuxi Zhongjing Material Technology Co., Ltd., and the specific brand is TWA25, the same below.

[0041] Example 2

[0042] This embodiment provides a method for preparing an aluminum alloy matte surface polishing liquid, and the specific steps are as follows:

[0043] According to the weight components in Example 1, sulfosalicylic acid, acetylated distarch phosphate and N,N'-methylenebismorpholine were added to water, stirred at room temperature for 25 minutes at a stirring rate of 40 r / min to fully dissolve them. Then, plate-like aluminum oxide was added, and stirring was continued for 25 minutes at a stirring rate of 40 r / min to obtain an aluminum alloy matte surface polishing liquid of the present invention.

[0044] Example 3

[0045] This embodiment provides an aluminum alloy matte surface polishing liquid, which is composed of the following components by weight:

[0046]

[0047]

[0048] Example 4

[0049] This embodiment provides a method for preparing an aluminum alloy matte polishing liquid. The difference between this embodiment and Example 2 is that the preparation is carried out according to the weight of each component in Example 3, and other conditions are the same.

[0050] Comparative Example 1

[0051] This comparative example provides a grinding liquid. The difference between this comparative example and Example 1 is that salicylic acid is used instead of the sulfosalicylic acid in Example 1, and other conditions are the same.

[0052] Comparative Example 2

[0053] This comparative example provides a grinding liquid. The difference between this comparative example and Example 1 is that 4-hydroxybenzenesulfonic acid is used instead of the sulfosalicylic acid in Example 1, and the other conditions are the same.

[0054] Comparative Example 3

[0055] This comparative example provides a grinding liquid. The difference between this comparative example and Example 1 is that conventional alumina powder (particle size D50 is 25um) is used to replace the plate-like alumina (particle size D50 is 25um) in Example 1, and other conditions are the same.

[0056] Comparative Example 4

[0057] This comparative example provides a grinding liquid. The difference between this comparative example and Example 1 is that the acetylated distarch phosphate in Example 1 is not included, and the other conditions are the same.

[0058] Comparative Example 5

[0059] This comparative example provides a grinding liquid. The difference between this comparative example and Example 1 is that the N,N'-methylenebismorpholine in Example 1 is not included, and the other conditions are the same.

[0060] Test Example 1

[0061] The grinding liquids in the above embodiments and comparative examples were tested, wherein the specific test methods are as follows:

[0062] (1) Corrosiveness to abrasives

[0063] By testing the free acid value of the grinding liquid just prepared and after being placed for one month, it can be judged whether the organic acid is corrosive to the abrasive. Since organic acids are corrosive to abrasives, their free acid value will inevitably decrease. Judging whether it is corrosive by the decrease in free acid value has a high degree of accuracy. The specific free acid test process is as follows: take 10g of the grinding liquid sample, dilute it with 100g of deionized water, add 2-3 drops of bromophenol blue indicator, titrate with 0.1N sodium hydroxide solution, record the volume of sodium hydroxide solution consumed when the solution changes from yellow to blue, and calculate the free acid value based on the acid-base neutralization ratio. The relevant test results are shown in Table 1:

[0064] (2) Grinding performance

[0065] Take 10 aluminum alloy camera bracket workpieces and grind them with a flat grinder, where the grinding time is 12 minutes, the pressure is 20kg, and the speed is 52r / min. After the camera bracket workpieces are cleaned and dried, the thickness of the thinning is tested with a height gauge, and the surface is observed to see if it has a matte effect. The relevant test results are shown in Table 1:

[0066] Table 1 Test results

[0067]

[0068] It can be seen from Example 1 and Example 3 in Table 1 that the free acid of the aluminum alloy matte grinding liquid of the present invention is reduced very little after being placed for 1 month, so it does not corrode the abrasive, and can grind to obtain a matte effect. It can be seen from Example 1 and Comparative Examples 1 and 2 that the organic acid containing both sulfonic acid group and carboxylic acid group in the present invention can obtain an aluminum alloy surface with a matte effect relative to single-group salicylic acid and 4-hydroxybenzenesulfonic acid. In Comparative Example 1, the carboxylic acid group has weak chemical corrosion ability, so the plate aluminum oxide mainly plays a polishing effect during the grinding process, so the aluminum alloy after grinding has high gloss and no matte effect. In Comparative Example 2, pitting occurs, resulting in uneven surface color and no matte effect. Comparing Example 1 and Comparative Example 3, plate-like aluminum oxide can significantly avoid scratches on the workpiece surface relative to conventional aluminum oxide. Comparing Example 1 and Comparative Example 4, acetylated distarch phosphate can prevent the sulfosalicylic acid in the grinding liquid from corroding the plate-like aluminum oxide after the grinding liquid is placed for a long time. Comparing Example 1 and Comparative Example 5, the matte agent can make the surface of the workpiece after grinding appear dark black and have a matte effect.

[0069] The above description is only a specific embodiment of the present invention, and the scope of protection of the present invention cannot be limited by this. Any non-substantial changes made by using the present invention, changes in certain process technologies derived from the concept and specific embodiments of the present invention, or non-substantial changes such as replacement of related technologies, or direct or indirect application in other related technical fields, all fall within the scope of protection required by the present invention.

Claims

1. A polishing liquid, characterized in that: The raw materials are prepared, in parts by weight, including: 0.5-2 parts of organic acid, 10-30 parts of abrasive, 0.5-2 parts of abrasive protective agent and 1-3 parts of matte agent; The organic acid comprises at least one of sulfosalicylic acid and sulfosuccinic acid; The abrasive material includes plate-like aluminum oxide; The abrasive protective agent comprises at least one of acetylated distarch phosphate and hydroxypropyl distarch phosphate; The matte agent includes at least one of N,N'-methylenebismorpholine and 4,4'-(1,2-ethylene)bismorpholine; The particle size D50 of the abrasive is 15-35um.

2. The polishing liquid according to claim 1, characterized in that The raw materials for preparing the grinding liquid also include water.

3. The polishing liquid according to claim 2, characterized in that: In parts by weight, the grinding liquid includes 0.5-2 parts of the organic acid, 10-30 parts of the abrasive, 0.5-2 parts of the abrasive protective agent, 1-3 parts of the matte agent and 65-85 parts of water.

4. The method for preparing the polishing liquid according to any one of claims 1 to 3, characterized in that: Including After the organic acid, the abrasive protective agent and the matte agent are dispersed, the abrasive is added and mixed.

5. The method for preparing the grinding liquid according to claim 4, characterized in that: The mixing temperature is 25-35°C.

6. Use of the grinding liquid as described in any one of claims 1 to 3 in the surface treatment of aluminum alloy.

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