High-settleability water-based glass grinding fluid and preparation method thereof

Abstract

The invention discloses a high-settleability water-based glass grinding fluid and a preparation method thereof, and belongs to the technical field of grinding fluids. The water-based glass grinding fluid comprises the following components in percentage by mass: 1%-5% of monobasic acid, 1%-5% of binary acid, 0.5%-2% of a water-based copper corrosion inhibitor, 1%-5% of a cleaning penetrant, 5%-10% of triethanolamine, 6%-12% of hydroxyl polyether amine, 1%-3% of a polyether chelating agent, 5%-10% of polyethylene glycol, 10%-20% of glycerol, 1%-3% of a bactericide and the balance of water. And the balance of deionized water. The preparation method comprises the following steps: adding the monobasic acid, the binary acid, the water-based copper corrosion inhibitor and the triethanolamine into half of the deionized water, stirring until the solution is clear and transparent, then sequentially adding the hydroxyl polyether amine, the polyether chelating agent, the polyethylene glycol, the glycerol, the cleaning penetrating agent, the bactericide and the balance of water, stirring until the solution is uniform when one component is added, then adding the next component, and uniformly stirring until the solution is uniform. And after completely adding and mixing, standing to obtain the water-based glass grinding fluid. The glass grinding fluid provided by the invention has efficient settleability, excellent cooling and lubricating performance and antirust performance.

Description

Technical Field

[0001] This invention relates to the field of grinding fluid technology, and in particular to a high-settling water-based glass grinding fluid and its preparation method. Background Technology

[0002] With the increasing demands for surface quality and processing efficiency of brittle and hard materials such as quartz glass and ceramics in fields such as optoelectronics, semiconductors, and aerospace, precision glass grinding has become one of the key processes. Because this process generates a large amount of heat and fine glass powder in a very short time, the grinding fluid must simultaneously possess excellent cooling, lubrication, and cleaning properties to inhibit thermal cracking, reduce wheel wear, and prevent secondary scratches.

[0003] Currently, commercially available water-based glass grinding fluids mainly fall into three categories: ordinary water-based grinding fluids (such as patent CN118879389A): based on deionized water, with only a small amount of lubricant and rust inhibitor added. They offer excellent cooling performance, but insufficient lubrication film strength leads to low grinding efficiency and unstable, continuously slowing down the grinding rate. Grinding chips easily adhere to the workpiece surface, resulting in a short cycle life. Additive-containing water-based grinding fluids (such as patent CN107057802A): improve extreme pressure lubricity by introducing inorganic salts, but the salting-out effect exacerbates electrochemical corrosion of machine tools and pipelines, increasing maintenance costs. Composite water-based grinding fluids (such as patent CN106675749B): utilize high-molecular polymers (self-emulsifying esters, ternary polycarboxylic acids, etc.) to construct a multi-functional system of lubrication, rust prevention, and cleaning. However, the large molecular weight and poor chain segment flexibility of these polymers easily form a strong adsorption film on the grinding chips and grinding wheel surface, resulting in low grinding chip settling efficiency, difficulty in circulation and filtration, and the continued occurrence of scratches and abnormal tool wear after long-term use.

[0004] The above-mentioned systems generally have the following common problems during recycling: the density of fine glass powder is close to that of water, and traditional sedimentation or centrifugation methods are difficult to achieve rapid separation, resulting in the continuous suspension of grinding debris in the liquid tank; the suspended grinding debris re-enters the grinding zone with the liquid flow, causing scratches on the workpiece surface and clogging of the grinding wheel, resulting in a decrease in machining accuracy; in order to ensure machining quality, the grinding fluid needs to be replaced frequently, which increases the cost of waste liquid treatment and reduces the equipment uptime.

[0005] Therefore, developing a new type of water-based glass grinding fluid that combines excellent cooling and lubrication properties with efficient chip settling and long-term recycling has become a critical technical bottleneck that needs to be overcome in this field. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a water-based glass grinding fluid with high settling properties. Through a unique low steric hindrance composite formula design and the density difference of suspended solid particles, it achieves rapid settling and separation of grinding debris; significantly improves the recycling efficiency of the grinding fluid, and effectively extends the service life of the grinding fluid while ensuring excellent cooling and lubrication performance.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides a high-settling water-based glass grinding fluid, comprising the following components by mass percentage: monobasic acid: 1%-5%, dibasic acid: 1%-5%, water-based copper corrosion inhibitor: 0.5%-2%, cleaning and penetrating agent: 1-5%, triethanolamine: 5%-10%, hydroxyl polyetheramine: 6%-12%, polyether chelating agent: 1%-3%, polyethylene glycol: 5%-10%, glycerin: 10%-20%, bactericide: 1%-3%, and the balance being deionized water.

[0009] Furthermore, the cleaning penetrant is sodium alkylbenzene sulfonate.

[0010] Furthermore, the monocarboxylic acid is selected from one of p-toluenesulfonylaminocaproic acid, boric acid, and benzoic acid.

[0011] Furthermore, the dicarboxylic acid is selected from one or two of sebacic acid, straight-chain dodecanoic acid, azelaic acid, octanoic acid, or glutaric acid.

[0012] Furthermore, the aqueous copper corrosion inhibitor is benzotriazole.

[0013] Furthermore, the polyether chelating agent is selected from one of caprylic / capric acid, octanoic acid, isononanoic acid, and aminocaproic acid.

[0014] Furthermore, the bactericide is N'N-methylenebismorphine.

[0015] Furthermore, the polyethylene glycol has a molecular weight range of 400-600; the hydroxyl polyetheramine has a molecular weight range of 2000-7000.

[0016] The present invention also provides a method for preparing the high sedimentation water-based glass grinding fluid, comprising the following steps: adding a monobasic acid, a dibasic acid, a water-based copper corrosion inhibitor and triethanolamine to half of the deionized water, stirring until clear and transparent, and then sequentially adding hydroxyl polyetheramine, a polyether chelating agent, polyethylene glycol, glycerin, a cleaning and penetrating agent, a bactericide and the remaining deionized water, stirring evenly to obtain the high sedimentation water-based glass grinding fluid.

[0017] Furthermore, in the process of adding components sequentially, each component needs to be stirred until it is evenly mixed before adding the next component.

[0018] Furthermore, the preparation steps also include stirring until homogeneous and then letting it stand for 2-4 hours.

[0019] Furthermore, after all components have been added, the stirring time is 10-15 minutes.

[0020] The present invention also provides an application of the high sedimentation water-based glass grinding fluid in the precision grinding of quartz glass or ceramics.

[0021] The present invention discloses the following technical effects:

[0022] 1. Synergistic effect of lubrication and cooling: The water-based glass grinding fluid of this invention uses specific amine compounds and polyols as synergistic agents to quickly form a low-shear, high-load-bearing lubricating film at the glass-grinding wheel interface, keeping the abrasive grains self-sharpened, delaying passivation, and improving the thermal conductivity during the grinding process, reducing the grinding temperature rise and improving the processing efficiency.

[0023] 2. Significantly improved surface quality: The uniform lubricating film formed by the water-based glass grinding fluid of the present invention can inhibit the adhesion and wear between the workpiece and the grinding wheel, significantly reduce scratches and chipping, and make the surface roughness of the glass and other materials being ground stable.

[0024] 3. Environmental protection and occupational health: The water-based glass grinding fluid of this invention adopts a fully biodegradable formula, free of nitrites, heavy metals and irritating components, which improves the biological stability of the grinding fluid, reduces waste liquid load, and eliminates odor, ensuring operational safety and environmental friendliness during the grinding process.

[0025] 4. Composite rust prevention and protection: The water-based glass grinding fluid of this invention adds monobasic acid, dibasic acid, water-based copper corrosion inhibitor, and triethanolamine to form a synergistic rust prevention system on the metal surfaces of the machine tool, which provides long-term rust prevention and extends the equipment life.

[0026] 5. High-efficiency settling of grinding debris: The combination of cleaning penetrant, polyethylene glycol-400, and glycerin as low steric hindrance aids significantly improves the settling speed of glass powder, promotes rapid clarification of the bath solution, reduces the load on the circulating filtration, ensures continuous cleanliness of the processing interface, and avoids secondary scratches.

[0027] 6. Long-lasting anti-foaming performance: This invention uses low-foaming / foam-free raw materials to suppress foam generation from the source. The grinding fluid system does not require additional defoamers and remains low-foaming after repeated use, eliminating the "rebound" phenomenon.

[0028] 7. Strong process adaptability: The water-based glass grinding fluid of the present invention is suitable for precision grinding of brittle and hard materials such as quartz glass, microcrystalline glass, sapphire, and ceramics. It is a single fluid with multiple uses, significantly extends the fluid change cycle, and reduces the overall cost. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 Image a is a picture of the supernatant of the water-based glass grinding fluid prepared in Comparative Example 2 after three days of continuous use and overnight standing. Image b is a picture of the supernatant of the water-based glass grinding fluid prepared in Example 1 after three days of continuous use and overnight standing.

[0031] Figure 2 The image shows the process of grinding a quartz disc with water-based glass grinding fluid in Example 1 (a) and the disc surface after grinding (b).

[0032] Figure 3 This is a picture of the supernatant in the grinding tank after the water-based glass grinding fluid prepared in Example 2 has been used continuously and left to stand overnight. Detailed Implementation

[0033] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0034] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0035] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0036] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be readily apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0037] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0038] This invention provides a high-settling water-based glass grinding fluid, comprising the following components by mass percentage: monobasic acid: 1%-5%, dibasic acid: 1%-5%, water-based copper corrosion inhibitor: 0.5%-2%, cleaning and penetrating agent: 1-5%, triethanolamine: 5%-10%, hydroxyl polyetheramine: 6%-12%, polyether chelating agent: 1%-3%, polyethylene glycol: 5%-10%, glycerin: 10%-20%, bactericide: 1%-3%, and the balance being deionized water.

[0039] In water-based glass grinding fluid, triethanolamine and hydroxyl polyetheramine synergistically form a weakly alkaline environment, which appropriately corrodes the surface substrate, promotes the exposure and renewal of abrasive particles, and forms a certain degree of diamond pad self-sharpening, ensuring stable and efficient grinding results. Polyether chelating agents and cleaning penetrants synergistically reduce the surface charge of grinding debris and wet the particles, achieving efficient sedimentation. Meanwhile, monobasic acid, dibasic acid, and water-based copper corrosion inhibitors work synergistically as rust inhibitors to form a carboxylate passivation film on the metal surface, achieving comprehensive rust prevention.

[0040] The main function of polyether chelating agents is to lower the cloud point and improve lubrication and compatibilization.

[0041] In some embodiments of the present invention, the polyethylene glycol is PEG-400.

[0042] PEG-400 has low viscosity and low steric hindrance, and has weak adhesion to glass surfaces, which can effectively suppress the adhesion of abrasives during the cycling process.

[0043] In some embodiments of the present invention, the cleaning penetrant is sodium alkylbenzene sulfonate.

[0044] Sodium alkylbenzene sulfonate is a low-foaming nonionic surfactant that can reduce interfacial tension, quickly wet the grinding debris and workpiece surface, promote powder detachment and accelerate sedimentation.

[0045] In some embodiments of the present invention, the monocarboxylic acid is selected from p-toluenesulfonylaminocaproic acid, boric acid, and benzoic acid.

[0046] In some embodiments of the present invention, the dicarboxylic acid is selected from one or two of sebacic acid, straight-chain dodecanoic acid, azelaic acid, octanoic acid, or glutaric acid.

[0047] In some embodiments of the present invention, the aqueous copper corrosion inhibitor is benzotriazole.

[0048] In some embodiments of the present invention, the polyether chelating agent is selected from one of caprylic / capric acid, n-capric acid, isononanoic acid, and aminocaproic acid.

[0049] In some embodiments of the present invention, the bactericide is N'N-methylenebismorphine.

[0050] In some embodiments of the present invention, the molecular weight of the polyethylene glycol is in the range of 400-600; and the molecular weight of the hydroxyl polyetheramine is in the range of 2000-7000.

[0051] This invention also provides a method for preparing the high-sedimentation water-based glass grinding fluid, comprising the following steps: adding a monobasic acid, a dibasic acid, a water-based copper corrosion inhibitor, and triethanolamine to half of the deionized water, stirring until clear and transparent, then sequentially adding hydroxyl polyetheramine, a polyether chelating agent, polyethylene glycol, glycerin, a cleaning and penetrating agent, a bactericide, and the remaining deionized water, stirring evenly to obtain the high-sedimentation water-based glass grinding fluid.

[0052] In some embodiments of the present invention, during the sequential addition of each component, each component needs to be stirred until it is evenly mixed before adding the next component.

[0053] In some embodiments of the present invention, after all components are added and stirred evenly, a step of standing for 2-4 hours is also included.

[0054] In some embodiments of the present invention, the stirring time is 10-15 minutes after all components have been added.

[0055] This invention also provides an application of the high sedimentation water-based glass grinding fluid in the precision grinding of quartz glass or ceramics.

[0056] Example 1

[0057] A highly settling water-based glass grinding fluid comprises, by mass percentage: boric acid: 1%; sebacic acid: 1%; benzotriazole: 0.5%; sodium alkylbenzene sulfonate: 1%; triethanolamine: 5%; hydroxyl polyetheramine: 8%; caprylic / capric acid: 1%; PEG-400: 5%; glycerol: 10%; N'N-methylenebismorphine: 1%; deionized water: 66.5%.

[0058] The preparation method of the high sedimentation water-based glass grinding fluid is as follows:

[0059] 1) Weigh the above components according to the above mass percentages;

[0060] 2) Add half of the deionized water weighed in step 1) to a stirrer, then add boric acid, sebacic acid, benzotriazole and triethanolamine, and stir until clear and transparent;

[0061] 3) Add hydroxy polyetheramine, caprylic / capric acid, PEG-400, glycerin, sodium alkylbenzene sulfonate, N'N-methylenebismorphine and the remaining water to step 2) in sequence. After each component is added, stir until it is evenly mixed before adding the next component. After all components are added, stir for 10 minutes to mix evenly, let stand for 2 hours, filter and dispense.

[0062] Example 2

[0063] A highly settling water-based glass grinding fluid comprises, by mass percentage: p-toluenesulfonylaminocaproic acid: 2%; linear dodecanoic acid: 2%; benzotriazole: 1%; sodium alkylbenzenesulfonate: 1%; triethanolamine: 8%; hydroxyl polyetheramine: 10%; octanoic acid: 2%; PEG-400: 8%; glycerol: 15%; N'N-methylenebismorphine: 2%; and deionized water: 49%.

[0064] The preparation method is the same as in Example 1.

[0065] Example 3

[0066] A highly settling water-based glass grinding fluid comprises, by mass percentage: boric acid: 2%; sebacic acid: 2%; benzotriazole: 1%; sodium alkylbenzene sulfonate: 2%; triethanolamine: 10%; hydroxyl polyetheramine: 12%; n-octanoic acid: 3%; PEG-400: 10%; glycerol: 20%; N'N-methylenebismorphine: 3%; deionized water: 35%.

[0067] The preparation method is the same as in Example 1.

[0068] Comparative Example 1

[0069] The difference from Example 1 is that no hydroxyl polyetheramine was added, and the amount of deionized water was 74.5%. The preparation method was the same as in Example 1.

[0070] Comparative Example 2

[0071] The difference from Example 1 is that no polyether chelating agent is added, the amount of deionized water is 67.5%, and the preparation method is the same as in Example 1.

[0072] Comparative Example 3

[0073] The difference from Example 1 is that no monobasic acid or dibasic acid is added, the amount of deionized water is 68.5%, and the preparation method is the same as in Example 1.

[0074] Test standard: Place the quartz discs on a D9 diamond pad and apply a pressure of 100g / cm per disc. 2 The material was diluted at a ratio of 1:8 and then rotated for grinding. The amount of material removed during grinding was recorded every 30 minutes, which is the removal rate. The removal rate is calculated as (initial thickness - thickness after grinding) / 30 minutes. Figure 2 Images (a) and (b) of the quartz disc after grinding, showing the process of using water-based glass grinding fluid in Example 1 of the quartz disc grinding test.

[0075] Removal rate data are shown in Table 1:

[0076] Table 1 Removal Rate

[0077]

[0078] According to the data in Table 1, the grinding rate of quartz plates was faster after using the water-based glass grinding fluid in Examples 1, 2 and Comparative Example 3, indicating that hydroxyl polyetheramine and polyether chelating agent have the effect of promoting the grinding rate, while monobasic acid and dibasic acid have no effect on the grinding rate.

[0079] Table 2 shows the performance comparison results of the grinding fluids of Examples 1-3 and Comparative Examples 1-3 diluted at a ratio of 1:8.

[0080] Table 2 Comparison of grinding fluid performance between Examples 1-3 and Comparative Examples 1-3

[0081]

[0082] As shown in Table 2, the water-based glass grinding fluids of Examples 1, 2, and 3 and Comparative Examples 1, 2, and 3 all have good rust prevention properties. The water-based glass grinding fluids of Examples 1, 2, and 3 can effectively reduce the roughness of quartz glass after grinding, resulting in smoother quartz glass. This indicates that the uniform lubricating film formed by the water-based glass grinding fluid of the present invention can inhibit the adhesion and wear between the workpiece and the grinding wheel, significantly reduce scratches and chipping, and stabilize the surface roughness.

[0083] Figure 1 Figure a shows the supernatant of the water-based glass grinding fluid prepared in Comparative Example 2 after it has been used and left to stand overnight. Figure 1 Figure b shows the supernatant of the water-based glass grinding fluid prepared in Example 1 after it has been used and left to stand overnight. It can be seen that the supernatant of Comparative Example 2 is turbid, while the supernatant of Example 1 is completely clear and transparent. This indicates that the water-based glass grinding fluid of Example 1 has good sedimentation performance, and the synergistic addition of low-resistance additives can achieve efficient sedimentation of the grinding fluid.

[0084] Figure 3 The image shows the supernatant in the grinding tank after the water-based glass grinding fluid prepared in Example 2 has been left to stand for one day. It can be seen that the supernatant is completely clear, indicating that the water-based grinding fluid prepared in Example 2 has high sedimentation performance.

[0085] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A water-based glass grinding fluid with high settling properties, characterized in that, The product comprises the following components by weight percentage: monobasic acid: 1%-5%, dibasic acid: 1%-5%, water-based copper corrosion inhibitor: 0.5%-2%, cleaning and penetrating agent: 1-5%, triethanolamine: 5%-10%, hydroxyl polyetheramine: 6%-12%, polyether chelating agent: 1%-3%, polyethylene glycol: 5%-10%, glycerin: 10%-20%, bactericide: 1%-3%, and the balance being deionized water.

2. The high-sedimentation water-based glass grinding fluid according to claim 1, characterized in that, The cleaning penetrant is sodium alkylbenzene sulfonate.

3. The high sedimentation water-based glass grinding fluid according to claim 1, characterized in that, The monocarboxylic acid is selected from one of p-toluenesulfonylaminocaproic acid, boric acid, and benzoic acid.

4. The high-sedimentation water-based glass grinding fluid according to claim 1, characterized in that, The dicarboxylic acid is selected from one or two of sebacic acid, straight-chain dodecanoic acid, azelaic acid, octanoic acid, and glutaric acid.

5. The high-sedimentation water-based glass grinding fluid according to claim 1, characterized in that, The aqueous copper corrosion inhibitor is benzotriazole.

6. A method for preparing the high-sedimentation water-based glass grinding fluid according to claim 1, characterized in that, Includes the following steps: Add monobasic acid, dibasic acid, water-based copper corrosion inhibitor, and triethanolamine to half of the deionized water, stir until clear and transparent, then add hydroxyl polyetheramine, polyether chelating agent, polyethylene glycol, glycerin, cleaning penetrant, bactericide, and the remaining deionized water in sequence, stir evenly to obtain a high sedimentation water-based glass grinding fluid.

7. The method for preparing the high-sedimentation water-based glass grinding fluid according to claim 6, characterized in that, During the process of adding each component in sequence, each component needs to be stirred until it is evenly mixed before adding the next component.

8. The method for preparing the high-sedimentation water-based glass grinding fluid according to claim 6, characterized in that, The process of mixing the ingredients thoroughly also includes a step of letting the mixture stand for 2-4 hours.

9. The method for preparing the high-sedimentation water-based glass grinding fluid according to claim 6, characterized in that, After all components have been added, stir for 10-15 minutes.

10. The application of the high-sedimentation water-based glass grinding fluid according to any one of claims 1-5 in the precision grinding of quartz glass or ceramics.

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