Water-based optical glass cleaning agent and preparation method thereof

Abstract

The present invention relates to the technical field of optical glass cleaning, and discloses a water-based optical glass cleaning agent and a preparation method thereof, the water-based optical glass cleaning agent comprises the following raw materials by weight: 12-22% of a surfactant, 0.5-3% of cyclodextrin or a derivative thereof, 2-6% of an aminocarboxylic acid complexing agent, 0.5-2% of a dispersant, 0.3-2.0% of a pH regulator, 0.05-0.3% of a preservative, and the balance of water. The problems that in the existing optical glass cleaning process, oil stain removal is not thorough, particulate matter is prone to secondary deposition, and water marks are prone to being left on the surface after cleaning are solved. The cleaning agent can efficiently remove cutting fluid, grinding powder, fingerprints and oil stains on the surfaces of optical glass and coated glass, has excellent rinsing performance and low-residue characteristics, and ensures the adhesive force and yield of a subsequent coating process.

Description

Technical Field

[0001] This invention relates to the field of optical glass cleaning technology, and in particular to a water-based optical glass cleaning agent and its preparation method. Background Technology

[0002] As a crucial material for optoelectronic devices and optical systems, the surface cleanliness of optical glass significantly impacts its optical performance and the quality of subsequent coatings. During the processing of optical glass, the glass surface typically retains a mixture of contaminants, including cutting fluid, polishing fluid, glass powder, metal particles, and oil and fingerprints generated during operation.

[0003] In existing technologies, cleaning methods for optical glass mainly include solvent-based cleaning and water-based cleaning. While solvent-based cleaning agents have some ability to remove oil stains, they suffer from problems such as flammability, volatility, and significant environmental pollution, making them difficult to meet the requirements of safe production and green manufacturing. In contrast, water-based cleaning agents have advantages such as high safety and environmental friendliness, but they still have the following shortcomings in practical applications:

[0004] On the one hand, water-based cleaning agents often struggle to balance cleaning efficiency and post-cleaning residue when faced with a coexistence of oil stains, grinding fluid residue, and particulate contaminants. This can easily result in residual film or watermarks on the glass surface after cleaning, which can affect the adhesion and uniformity of subsequent coating layers.

[0005] On the other hand, the abrasive powder and metal particles that are stripped off during the cleaning process are prone to secondary deposition on the glass surface, resulting in minor defects on the glass surface and thus affecting optical performance. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a water-based optical glass cleaning agent and its preparation method, solving the problems of incomplete oil removal, easy secondary deposition of particulate matter, and watermarks remaining on the surface after cleaning in existing optical glass cleaning processes. The cleaning agent can efficiently remove cutting fluid, grinding powder, fingerprints, and oil stains from the surface of optical glass and coated glass, while having excellent rinsing performance and low residue characteristics, ensuring the adhesion and yield of subsequent coating processes.

[0007] The present invention solves the above-mentioned technical problems through the following technical means:

[0008] In a first aspect, the present invention provides a water-based optical glass cleaning agent comprising the following raw materials by weight percentage: 12-22% surfactant, 0.5-3% cyclodextrin or its derivatives, 2-6% aminocarboxylic acid complexing agent, 0.5-2% dispersant, 0.3-2.0% pH adjuster, 0.05-0.3% preservative, and water as the balance.

[0009] Based on the aforementioned technical means, through the synergistic effect of surfactants, cyclodextrins, complexing agents, and dispersants, during cleaning, the high content of surfactants not only wets and emulsifies stubborn oil stains and fingerprints on the optical glass surface, but also reduces the surface tension of the cleaning fluid, facilitating penetration into the interior of tiny scratches. Combined with the unique cavity structure of cyclodextrins or their derivatives, they can encapsulate the detached hydrophobic oil molecules, preventing them from demulsifying and re-contaminating in the aqueous phase. Furthermore, through the action of aminocarboxylic acid complexing agents and dispersants, residual metal ions in the polishing fluid can be strongly chelated, and particulate matter such as glass powder can be dispersed and stabilized, thereby achieving thorough removal of complex contaminants.

[0010] Preferably, the surfactant is one or more of the following: cocamidopropyl betaine, dodecyl dimethyl betaine, dodecyl dimethylamine oxide, and sodium lauroylamphoacetate.

[0011] More preferably, the surfactant is a mixture of cocamidopropyl betaine and dodecyl dimethylamine oxide.

[0012] More preferably, the mass ratio of cocamidopropyl betaine to dodecyl dimethylamine oxide is (2-3):1.

[0013] Based on the aforementioned technical methods, cocamidopropyl betaine possesses excellent emulsifying and detergency properties and low irritation, but at high concentrations, it may have the problem of foam that is difficult to dissipate quickly. Dodecyl dimethylamine oxide, as a special amphoteric surfactant, exhibits nonionic properties under weakly alkaline conditions, possessing excellent foam stabilizing and solubilizing effects. By controlling the mass ratio of the two to betaine within the range of (2-3):1, strong hydrophobic interactions are generated between their molecules, significantly reducing the critical micelle concentration (CMC) of the mixed system. This allows the cleaning agent to achieve saturated adsorption at a lower concentration, greatly improving the degreasing efficiency. Simultaneously, the addition of amine oxide improves the hydrophilic-lipophilic balance (HLB value) of betaine, making it easier for the foam after cleaning to be carried away by water. This not only increases the rinsing speed but also further reduces the risk of surfactant residue on the glass surface, solving the problems of "white fog" or "watermarks."

[0014] Preferably, the cyclodextrin or its derivative is one or more combinations of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin or their water-soluble derivatives.

[0015] More preferably, the cyclodextrin or its derivative is a combination of β-cyclodextrin and methyl-β-cyclodextrin.

[0016] More preferably, the mass ratio of β-cyclodextrin to methyl-β-cyclodextrin is 1:(1-2).

[0017] Based on the aforementioned techniques, while ordinary β-cyclodextrin exhibits excellent inclusion specificity for aromatic compounds (such as certain oily components in fingerprints), its water solubility is relatively low (only about 1.85 g / 100 ml at room temperature), limiting its capture capacity. Methyl-β-cyclodextrin, however, undergoes methylation modification, disrupting intramolecular cyclic hydrogen bonds and significantly improving its water solubility (>50 g / 100 ml). Using the aforementioned ratio, methyl-β-cyclodextrin acts as a "cosolvent," utilizing its high solubility to stably disperse β-cyclodextrin in the system, preventing crystallization at low temperatures. Simultaneously, the coexistence of two cyclodextrins with different degrees of substitution enriches the hydrophobic cavity microenvironment, enabling "broad-spectrum inclusion" of oil molecules of different sizes and polarities (such as straight-chain alkanes and aromatic hydrocarbons). This significantly increases the cleaning agent's capacity to accommodate complex contaminants and its ability to prevent anti-fouling.

[0018] Preferably, the aminocarboxylic acid complexing agent is one or a combination of methylglycine diacetic acid, glutamic acid diacetic acid, and hydroxyethyl ethylenediamine triacetic acid.

[0019] More preferably, the aminocarboxylic acid complexing agent is methylglycine diacetic acid.

[0020] Based on the above technical means, novel green chelating agents such as methylglycine diacetic acid are selected. These agents not only have extremely strong chelating ability for calcium, magnesium and transition metal ions, effectively destroying the metal ion "bridging" effect between dirt and substrate and promoting dirt dissociation; but also have good biodegradability, which meets the increasingly stringent environmental emission standards of the optical glass cleaning industry.

[0021] Preferably, the dispersant is one or more combinations of polyacrylic acid and its salts, polymethacrylic acid and its salts, polyacrylic acid-maleic acid copolymer, polyaspartic acid and its salts, and polyvinylpyrrolidone.

[0022] More preferably, the dispersant is a polyaspartic acid salt.

[0023] More preferably, the polyaspartic acid salt is sodium polyaspartic acid.

[0024] Based on the above-mentioned technical means, polymeric dispersants such as polyaspartate can be adsorbed on the surface of solid particles such as glass powder and grinding powder. By utilizing the steric hindrance effect and electrostatic repulsion, the particles are stably suspended in water, preventing them from agglomerating and sinking or redepositing on the clean glass surface. This is crucial for reducing the number of particles (LPC) on the glass surface after cleaning.

[0025] Preferably, the pH adjuster is one or a combination of organic amines and alkali metal salts.

[0026] More preferably, the organic amine is one or a combination of triethanolamine, monoethanolamine, and diethanolamine; and the alkali metal salt is one or a combination of sodium carbonate, sodium bicarbonate, and potassium carbonate.

[0027] More preferably, the pH adjuster is a mixture of triethanolamine and sodium carbonate.

[0028] More preferably, the mass ratio of triethanolamine to sodium carbonate is (1-2):1.

[0029] Based on the above technical means, on the one hand, by selecting triethanolamine and sodium carbonate to form an inorganic buffer pair using sodium carbonate / sodium bicarbonate (generated by the reaction), a stable alkaline environment (pH 8.2-8.8) can be provided, and acidic grease and dirt introduced during the cleaning process can be effectively neutralized to prevent drastic pH fluctuations. On the other hand, triethanolamine, as an organic base, not only regulates the pH value but also functions as a corrosion inhibitor. The nitrogen atoms in its molecule can form hydrogen bonds with the silanol groups on the glass surface, forming an extremely thin protective film on the glass surface. This effectively inhibits the corrosion of sensitive optical glass (such as lead-containing or phosphate glass) by alkaline components (i.e., prevents "mold" or "white spots"), solving the problem that traditional strong alkaline cleaning agents easily damage the substrate.

[0030] Preferably, the preservative is one or a combination of 1,2-benzisothiazolin-3-one, 2-methyl-4-isothiazolin-3-one.

[0031] More preferably, the preservative is 1,2-benzisothiazolin-3-one.

[0032] Based on the above technical means, the preservative has excellent chemical stability in a weakly alkaline buffer system with a pH of 8.2-8.8, and has a broad-spectrum bactericidal efficiency. Only a very low addition amount (0.05%-0.3%) is needed to effectively inhibit the growth of bacteria and mold and prevent the cleaning agent from deteriorating and becoming smelly. At the same time, because it has excellent water solubility and does not contain hydrophobic chains with strong surface activity, it is very easy to rinse away with water after cleaning and will not form "watermarks" on the surface of optical glass or interfere with subsequent coating processes.

[0033] Secondly, the present invention provides a method for preparing a water-based optical glass cleaning agent, the method comprising:

[0034] A pH adjuster is added to water to adjust the pH value and form a buffer system; then an aminocarboxylic acid complexing agent and a dispersant are added and mixed evenly; cyclodextrin or its derivatives are added and mixed evenly; a surfactant and a preservative are added and stirred evenly to obtain a mixture; the mixture is filtered and defoamed to obtain the water-based optical glass cleaning agent.

[0035] Preferably, adjusting the pH value means adjusting the pH to 8.2 to 8.8.

[0036] Based on the above technical means, controlling the pH in the weakly alkaline range of 8.2 to 8.8 is the optimal range for balancing cleaning efficiency and substrate safety, which can effectively remove oil stains without damaging the coating layer or sensitive glass materials.

[0037] Preferably, the filtration is a precision filtration process with a filter membrane pore size of 0.1 μm to 0.45 μm.

[0038] Based on the above-mentioned technical means, the precise filtration of microporous membranes can intercept mechanical impurities and insoluble particles brought in by the raw materials, ensuring the extremely high cleanliness of the finished cleaning agent, which is a prerequisite for meeting the requirements of high-precision optical cleaning.

[0039] Preferably, the degassing treatment employs one or a combination of vacuum degassing and ultrasonic degassing.

[0040] According to the above-mentioned technical means, degassing treatment can remove tiny air bubbles entrained in the mixture, preventing uneven micro-area cleaning or interference with the cavitation effect of ultrasonic cleaning equipment due to bubble rupture during cleaning.

[0041] The beneficial effects of this invention are:

[0042] (1) This invention uses a high content of cocamidopropyl betaine and dodecyl dimethylamine oxide, which utilizes its low surface tension and excellent solubilizing effect under weakly alkaline conditions to quickly penetrate into the micro-scratches and fingerprints on the optical glass surface for emulsification; combined with the "broad-spectrum" host-guest inclusion system formed by β-cyclodextrin and methyl-β-cyclodextrin, the hydrophobic oil molecules and organic impurities stripped from the emulsion can be permanently locked in the cavities of the cyclodextrin. This dual mechanism of "emulsification-inclusion" fundamentally blocks the path of oil stains being re-adsorbed onto the hydrophilic glass surface after demulsification, effectively solving the common problems of "white fog" and "oil spots" residue in precision cleaning.

[0043] (2) This invention introduces green and efficient complexing agents such as methylglycine diacetic acid, which can strongly chelate calcium, magnesium and transition metal ions in the cleaning water and dirt, and destroy the "metal bridge" connection between the dirt and the glass substrate; at the same time, with the electrostatic repulsion and steric hindrance effect of polymeric dispersants such as polyaspartate, the submicron-sized glass powder and abrasive particles that are peeled off are stably suspended in the water, preventing them from agglomerating or secondary deposition. This compound system is particularly suitable for ultrasonic cleaning before coating, and can significantly improve the adhesion and optical uniformity of the subsequent coating layer.

[0044] (3) The present invention utilizes triethanolamine and sodium carbonate to precisely lock the pH value of the cleaning agent within a mild range of 8.2 to 8.8, forming a stable buffer pair that can effectively neutralize pH fluctuations caused by acidic dirt and maintain the optimal activity of each additive. At the same time, triethanolamine molecules can adsorb onto the glass surface to form a monomolecular protective film, effectively inhibiting the corrosion of sensitive optical glass containing lead or phosphate by alkaline components, thus solving the technical problem that traditional alkaline cleaning agents easily cause glass to "mold" or produce corrosion spots.

[0045] (4) The preparation process of this invention is rigorous, and the product has high cleanliness, meeting the stringent requirements of optical-grade precision cleaning. This invention specifically introduces a precision filtration process of 0.1μm to 0.45μm and a vacuum / ultrasonic degassing step during the preparation process, strictly controlling the initial particle size and gas content of the cleaning agent itself. This not only avoids secondary pollution caused by impurities in the cleaning agent itself, but also eliminates the interference of microbubbles on the ultrasonic cavitation effect, ensuring the consistency and yield of the cleaning process, making it particularly suitable for the industrial cleaning of high-precision optical lenses and display modules. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] A water-based optical glass cleaning agent according to an embodiment of this application comprises the following raw materials:

[0048] Surfactant: A mixture of cocamidopropyl betaine and dodecyl dimethylamine oxide in a mass ratio of (2-3):1;

[0049] Cyclodextrin or its derivatives: a combination of β-cyclodextrin and methyl-β-cyclodextrin in a mass ratio of 1:(1-2);

[0050] Aminocarboxylic acid complexing agents: methylglycine diacetic acid;

[0051] Dispersant: Sodium polyaspartate;

[0052] pH adjuster: a mixture of triethanolamine and sodium carbonate in a mass ratio of (1-2):1;

[0053] Preservative: 1,2-benzisothiazolin-3-one;

[0054] And the remaining water volume.

[0055] Example 1

[0056] This embodiment provides a water-based optical glass cleaning agent and its preparation method. The water-based optical glass cleaning agent, by mass percentage, comprises: a mixture of 12% cocamidopropyl betaine and dodecyl dimethylamine oxide (mass ratio 2:1), a combination of 0.5% β-cyclodextrin and methyl-β-cyclodextrin (mass ratio 1:1), 2% methylglycine diacetic acid, 0.5% sodium polyaspartate, a mixture of 0.3% triethanolamine and sodium carbonate (mass ratio 1:1), 0.05% 1,2-benzisothiazolin-3-one, and the balance being water.

[0057] The preparation method is as follows: A mixture of triethanolamine and sodium carbonate is added to water to adjust the pH to 8.2 and form a buffer system; then methylglycine diacetic acid and sodium polyaspartate are added and mixed evenly; a combination of β-cyclodextrin and methyl-β-cyclodextrin is added and mixed evenly; a mixture of cocamidopropyl betaine and dodecyl dimethylamine oxide and 1,2-benzisothiazolin-3-one are added and stirred evenly to obtain a mixed solution; the mixed solution is filtered and defoamed to obtain a water-based optical glass cleaning agent. The filtration is performed using a precision filter with a filter membrane pore size of 0.1 μm. The defoaming treatment is performed using vacuum defoaming.

[0058] Example 2

[0059] This embodiment provides a water-based optical glass cleaning agent and its preparation method. The water-based optical glass cleaning agent, by mass percentage, comprises: a mixture of 17% cocamidopropyl betaine and dodecyl dimethylamine oxide (mass ratio 2:1), a combination of 1.75% β-cyclodextrin and methyl-β-cyclodextrin (mass ratio 1:1), 4% methylglycine diacetic acid, 1.25% sodium polyaspartate, a mixture of 1.15% triethanolamine and sodium carbonate (mass ratio 1:1), 0.175% 1,2-benzisothiazolin-3-one, and the balance being water.

[0060] The preparation method is as follows: A mixture of triethanolamine and sodium carbonate is added to water to adjust the pH to 8.5 and form a buffer system; then methylglycine diacetic acid and sodium polyaspartate are added and mixed evenly; a combination of β-cyclodextrin and methyl-β-cyclodextrin is added and mixed evenly; a mixture of cocamidopropyl betaine and dodecyl dimethylamine oxide and 1,2-benzisothiazolin-3-one are added and stirred evenly to obtain a mixed solution; the mixed solution is filtered and defoamed to obtain a water-based optical glass cleaning agent. The filtration is performed using a precision filter with a filter membrane pore size of 0.28 μm. The defoaming treatment is performed using vacuum defoaming.

[0061] Example 3

[0062] This embodiment provides a water-based optical glass cleaning agent and its preparation method. The water-based optical glass cleaning agent comprises, by mass percentage: 22% of a mixture of cocamidopropyl betaine and dodecyl dimethylamine oxide (mass ratio 2:1), 3% of a combination of β-cyclodextrin and methyl-β-cyclodextrin (mass ratio 1:1), 6% of methylglycine diacetic acid, 2% of sodium polyaspartate glutamate, 2.0% of a mixture of triethanolamine and sodium carbonate (mass ratio 1:1), 0.3% of 1,2-benzisothiazolin-3-one, and the balance being water.

[0063] The preparation method is as follows: A mixture of triethanolamine and sodium carbonate is added to water to adjust the pH to 8.8 and form a buffer system; then methylglycine diacetic acid and sodium polyaspartate are added and mixed evenly; a combination of β-cyclodextrin and methyl-β-cyclodextrin is added and mixed evenly; a mixture of cocamidopropyl betaine and dodecyl dimethylamine oxide and 1,2-benzisothiazolin-3-one are added and stirred evenly to obtain a mixed solution; the mixed solution is filtered and defoamed to obtain a water-based optical glass cleaning agent. The filtration uses a precision filter with a filter membrane pore size of 0.45 μm. The defoaming treatment uses vacuum defoaming.

[0064] Example 4

[0065] The difference from Example 2 is that the mass ratio of the mixture of cocamidopropyl betaine and dodecyl dimethylamine oxide is 3:1.

[0066] Example 5

[0067] The difference from Example 2 is that the mass ratio of the combination of β-cyclodextrin and methyl-β-cyclodextrin is 1:2.

[0068] Example 6

[0069] The difference from Example 2 is that the mass ratio of triethanolamine to sodium carbonate is 2:1.

[0070] Comparative Example 1

[0071] The difference from Example 2 is that β-cyclodextrin and methyl-β-cyclodextrin are not added.

[0072] Comparative Example 2

[0073] The difference from Example 2 is that sodium polyaspartate is not added.

[0074] Comparative Example 3

[0075] The difference from Example 2 is that only sodium carbonate was used to adjust the pH to 10.5, and triethanolamine was not added.

[0076] Comparative Example 4

[0077] The difference from Example 2 is that β-cyclodextrin and methyl-β-cyclodextrin were removed and replaced with 2.0% propylene glycol.

[0078] Comparative Example 5

[0079] The difference from Example 2 is that only 1.5% β-cyclodextrin was used.

[0080] Performance testing

[0081] 1. Sample Design

[0082] Sample: AR-coated optical glass (50mm×50mm), n=3 per group.

[0083] Preparation of composite contaminants (mass ratio): Sebum-simulating oil (mineral oil mixture): Polishing slurry (glass powder particles, D50≈0.8μm): Metal ion solution (Ca 2+ / Mg 2+ / Fe 3+ (Mixed) = 6:3:1.

[0084] Contamination method: Apply 0.20g / sheet evenly and let stand at 60℃ for 30 minutes to cure.

[0085] 2. Cleaning method

[0086] Cleaning solution: The cleaning agents of each example / comparative example were diluted with 3% (w / w) deionized water.

[0087] Cleaning method: Ultrasonic cleaning (40kHz), 40℃, 5min.

[0088] Rinse: Rinse with deionized water (flow rate 1L / min) until “no visible foam and continuous water film”, and record the rinsing time.

[0089] Drying: Nitrogen blowing + drying at 60℃ for 10 min.

[0090] 3. Test Indicators and Methods

[0091] (1) Oil removal rate R (%)

[0092] Using the quality difference before and after contamination:

[0093]

[0094] Where m0 is the initial mass of the pollutant and m1 is the mass of the residual pollutant after cleaning.

[0095] (2) Particle residue (LPC, ≥0.5μm, particles / cm) 2 )

[0096] The average value was calculated from five fields of view using a microscope or a surface particle counter.

[0097] (3) Rinsing time (s)

[0098] Record the time from the start of rinsing until a "continuous water film without foam" appears on the glass surface.

[0099] (4) Surface white fog / water marks (grade)

[0100] Visual and transillumination observation, grade 0-3: 0 = none; 1 = slight; 2 = obvious; 3 = serious.

[0101] (5) Coating adhesion (grade)

[0102] After cleaning and drying, perform a cross-cut adhesion test (0 is the best, 5 is the worst).

[0103] 4. Experimental Data

[0104] The data are represented as the average value for n=3, as shown in Table 1.

[0105] Table 1

[0106]

[0107] As shown in Table 1, the oil removal rate of Comparative Example 1 decreased significantly and the rinsing time was significantly prolonged, while the white fog / water mark level increased. This indicates that under the condition of high surfactant stripping of oil, if there is a lack of cyclodextrin inclusion and carrying effect, the stripped oil is more prone to back-fogging, leading to residual film and water mark problems.

[0108] Comparative Example 2 still showed a high oil removal rate, but the residual particulate matter (LPC) increased significantly, proving that complexing agents alone are insufficient to inhibit secondary particle deposition.

[0109] Although Comparative Example 3 still maintained a high decontamination rate, the white fog / watermarks and adhesion level deteriorated significantly, indicating that strong alkaline conditions have an adverse effect on optical glass / coating.

[0110] Comparative Example 4 shows that even with the addition of conventional solubilizers, it is difficult to achieve rinsing and residue control effects comparable to those of the cyclodextrin system. This indicates that the present invention is not "substitutable by any solubilization", but rather relies on the inclusion effect of cyclodextrin to achieve low residue and anti-recontamination.

[0111] Comparative Example 5 showed worse rinsing time and white fog level compared to Example 2, indicating that the optimization of solubility and inclusion microenvironment brought about by the combination of β-CD and methyl-β-CD contributes to the overall performance.

[0112] In Example 2, under the synergistic effect of complexing and dispersing agents, LPC was significantly reduced, demonstrating the targeted solution to the complex contamination of "grinding fluid + particles". Superior surface condition and adhesion were observed within the weakly alkaline pH range of 8.2–8.8, proving that the pH window set in this invention has the combined advantages of "cleaning efficiency and substrate safety".

[0113] The above provides a detailed description of a water-based optical glass cleaning agent and its preparation method provided by the present invention. The specific embodiments are provided only to aid in understanding the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0114] It should be noted that: for experimental steps or conditions not specified in the examples, the procedures and conditions described in conventional experimental procedures in the literature of this art can be followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0115] The above examples are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by anyone under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the scope of protection of the present invention.

Claims

1. A water-based optical glass cleaning agent, characterized in that, The raw materials include the following weight percentages: 12-22% surfactant, 0.5-3% cyclodextrin or its derivatives, 2-6% aminocarboxylic acid complexing agent, 0.5-2% dispersant, 0.3-2.0% pH adjuster, 0.05-0.3% preservative, and water as the balance.

2. The water-based optical glass cleaning agent according to claim 1, characterized in that, The surfactant is one or more of the following: cocamidopropyl betaine, dodecyl dimethyl betaine, dodecyl dimethylamine oxide, and sodium lauroylamphoacetate.

3. The water-based optical glass cleaning agent according to claim 1, characterized in that, The cyclodextrin or its derivatives are one or more combinations of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin or their water-soluble derivatives.

4. The water-based optical glass cleaning agent according to claim 1, characterized in that, The aminocarboxylic acid complexing agent is one or more combinations of methylglycine diacetic acid, glutamic acid diacetic acid, and hydroxyethyl ethylenediamine triacetic acid.

5. The water-based optical glass cleaning agent according to claim 1, characterized in that, The dispersant is one or more combinations of polyacrylic acid and its salts, polymethacrylic acid and its salts, polyacrylic acid-maleic acid copolymer, polyaspartic acid and its salts, and polyvinylpyrrolidone.

6. The water-based optical glass cleaning agent according to claim 1, characterized in that, The pH adjuster is one or more combinations of organic amines and alkali metal salts.

7. The water-based optical glass cleaning agent according to claim 1, characterized in that, The preservative is one or a combination of 1,2-benzisothiazolin-3-one, 2-methyl-4-isothiazolin-3-one.

8. A method for preparing a water-based optical glass cleaning agent, used to prepare the water-based optical glass cleaning agent according to any one of claims 1-7, characterized in that, The preparation method includes: A pH adjuster is added to water to adjust the pH value and form a buffer system; then an aminocarboxylic acid complexing agent and a dispersant are added and mixed evenly; cyclodextrin or its derivatives are added and mixed evenly; a surfactant and a preservative are added and stirred evenly to obtain a mixture; the mixture is filtered and defoamed to obtain the water-based optical glass cleaning agent.

9. The method for preparing the water-based optical glass cleaning agent according to claim 8, characterized in that, The pH adjustment refers to adjusting the pH to 8.2–8.

8.

10. The method for preparing the water-based optical glass cleaning agent according to claim 8, characterized in that, The filtration process employs precision filtration with a filter membrane pore size of 0.1μm to 0.45μm, and the degassing treatment employs one or a combination of vacuum degassing and ultrasonic degassing.

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