Mobile phone ceramic cover plate mirror polishing cleaning agent and preparation method thereof

Abstract

This invention relates to a mirror polishing and cleaning agent for mobile phone ceramic cover plates and its preparation method, belonging to the technical field of cleaning agents. The cleaning agent comprises the following raw materials in parts by weight: 12-22 parts alkali, 7-14 parts surfactant, 5-8 parts polymeric additives, 6-8 parts chelating agent, 3-7 parts wetting agent, 2-4 parts corrosion inhibitor, 2-5 parts penetrant, 3-4 parts antistatic agent, 1-3 parts organic solvent, and 30-50 parts deionized water. This cleaning agent effectively reduces the adsorption force between the polishing liquid and the ceramic cover plate surface during cleaning. Utilizing the alkalinity, emulsification, and chelating properties of the cleaning agent, it can clean the ceramic cover plate surface, removing polishing liquids such as silicon oxide and diamond powder, ensuring the cleaning effect. Simultaneously, it will not corrode the mirror appearance of the ceramic cover plate after polishing, ensuring product quality. This cleaning agent has high cleaning efficiency, does not damage the mirror surface, and has good stability, making it suitable for cleaning processes after polishing high-end ceramic cover plates.

Description

Technical Field

[0001] This invention belongs to the field of cleaning agent technology, and relates to a mirror polishing cleaning agent for mobile phone ceramic cover plates and its preparation method. Background Technology

[0002] As smartphones and other electronic devices become increasingly sophisticated, ceramic cover plates are gaining popularity due to their superior wear resistance, smooth feel, and excellent signal penetration. However, ceramic cover plates require precise grinding and polishing to achieve a mirror finish. This process leaves behind a large amount of micron / submicron-sized abrasive particles (such as diamond and silicon dioxide), as well as a mixture of cutting fluid, fingerprints, and other contaminants that adhere to the product surface and are difficult to clean thoroughly. If these contaminants are not completely removed, they will severely impact the yield rate of subsequent processes such as coating and bonding.

[0003] Currently, while traditional alkaline cleaning agents can remove some organic residues, they lack the ability to disperse fine ceramic dust, easily leading to secondary adsorption. Cleaning agents containing strong acids can corrode ceramic surfaces, damaging their mirror-like gloss. Some cleaning agents lack targeted corrosion inhibition and anti-static designs, potentially causing micro-corrosion at the edges of the cover plate during cleaning, and leaving the surface prone to attracting dust and impurities due to static electricity after cleaning. Therefore, there is an urgent need for a specialized cleaning agent that can efficiently remove abrasive particles while possessing excellent corrosion resistance and anti-redeposition capabilities. Summary of the Invention

[0004] The purpose of this invention is to provide a mirror polishing and cleaning agent for mobile phone ceramic cover plates and its preparation method. This cleaning agent has the characteristics of high cleaning efficiency and effective prevention of secondary adsorption of particles.

[0005] The objective of this invention can be achieved through the following technical solutions: In a first aspect, the present invention provides a mirror polishing and cleaning agent for mobile phone ceramic cover plates, comprising the following raw materials in parts by weight: 12-22 parts alkali, 7-14 parts surfactant, 5-8 parts polymeric additive, 6-8 parts chelating agent, 3-7 parts wetting agent, 2-4 parts corrosion inhibitor, 2-5 parts penetrant, 3-4 parts antistatic agent, 1-3 parts organic solvent, and 30-50 parts deionized water.

[0006] Preferably, the alkali is at least one selected from sodium hydroxide, potassium hydroxide, sodium carbonate, and sodium phosphate. Its function is to provide the necessary alkaline environment, which serves two purposes: firstly, to saponify oily contaminants such as cutting fluid, and secondly, to weaken the electrostatic adsorption and van der Waals forces between the abrasive particles and the ceramic matrix, thus creating conditions for particle separation.

[0007] Preferably, the surfactant is at least one selected from secondary alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, and polyoxyethylene alkyl alcohol amide. Its core functions are emulsifying oil stains, dispersing suspended solid particles, and reducing the surface tension of the cleaning agent.

[0008] More preferably, the surfactant comprises isotridecyl alcohol polyoxyethylene ether.

[0009] Preferably, the polymeric additive is a compound of nonionic or anionic polyacrylamide and sodium carboxymethyl cellulose, with a mass ratio of 1:0.5-1. Polyacrylamide, through its long-chain structure, adsorbs and bridges dirt particles, while sodium carboxymethyl cellulose provides steric hindrance and electrostatic repulsion, preventing secondary adsorption of particles. Together, they achieve efficient particle suspension and removal. Based on this mechanism of action, and through experimental verification, it was found that when the mass ratio is within the range of 1:0.5-1, the cleaning agent achieves an optimal balance between particle suspension, cleaning efficiency, and solution viscosity.

[0010] Preferably, the chelating agent is at least one selected from sodium EDTA-4 (ethylenediaminetetraacetic acid tetrasodium), sodium HEDP-4 (hydroxyethylidene diphosphonate tetrasodium), sodium ethylenediamine di-o-hydroxyphenylacetate, and potassium sodium tartrate. It is used to chelate metal ions in water and those stripped from the surface, disrupt the fouling structure, and prevent the deposition of insoluble salts.

[0011] More preferably, the chelating agent is sodium HEDP-4, and the mass ratio of the isotridecyl alcohol polyoxyethylene ether to sodium HEDP-4 is 0.5:1 to 1.5:1.

[0012] Preferably, the corrosion inhibitor is an organophosphate corrosion inhibitor. It can form a protective film on the surface of the ceramic substrate in a strongly alkaline environment, providing corrosion inhibition and protection during cleaning, and preventing damage to the surface gloss of the ceramic cover.

[0013] In this invention, surfactants, wetting agents, and penetrants achieve synergistic cleaning through complementary functions: the wetting agent instantly reduces surface tension, ensuring the cleaning solution can quickly spread and cover the entire ceramic mirror surface, penetrating to microscopic crevices. The penetrant is at least one of fatty alcohol polyoxyethylene ether (JFC series) and sodium succinate sulfonate, its function being to enhance penetration into the microscopic crevices between particles and the matrix, assisting in breaking their bonding forces and making them easier to peel off. The three agents have different functional focuses, working synergistically to achieve rapid penetration, effective peeling, and thorough cleaning.

[0014] Preferably, the antistatic agent is at least one of ethanol, isopropanol, sodium nitrate, and urea, which eliminates static charge through rapid volatilization or ionic action, fundamentally reducing secondary adsorption of particles caused by electrostatic attraction.

[0015] Preferably, the organic solvent is at least one of ethylene glycol monobutyl ether, tetrahydrofurfuryl alcohol, and propylene glycol methyl ether, used to solubilize and dissolve organic dirt, and to produce a synergistic detergency effect with surfactants.

[0016] Secondly, the present invention provides a method for preparing a mirror polishing and cleaning agent for mobile phone ceramic cover plates, comprising the following steps: (1) Add about two-thirds of the total amount of deionized water to the reactor, then add the alkali and chelating agent in sequence and stir to dissolve; then add the polymer auxiliary agent solution that has been dissolved in the remaining deionized water in advance and stir for 20-30 minutes. (2) Add surfactant, wetting agent, penetrant, organic solvent and antistatic agent to the solution obtained in step (1) in sequence. After the addition is complete, stir for 30-50 minutes. (3) Add corrosion inhibitor to the mixture obtained in step (2) and continue stirring for 10-20 minutes; (4) Sampling and testing, material feeding and packaging.

[0017] The beneficial effects of this invention are: This invention utilizes the synergistic effect of alkali and chelating agents to efficiently saponify grease and break down the structure of abrasive pastes. Through the combined action of surfactants, wetting agents, and penetrants, it achieves rapid penetration, effective stripping, and emulsification dispersion of oil and particles. In particular, the specific ratio of nonionic / anionic polyacrylamide and sodium carboxymethyl cellulose allows polyacrylamide to adsorb and bridge dirt particles through its long-chain structure, while sodium carboxymethyl cellulose provides steric hindrance and electrostatic repulsion, preventing secondary adsorption of particles. Together, they achieve efficient suspension and removal of particles. Simultaneously, the organophosphate corrosion inhibitor provides excellent protection for the ceramic matrix in a strongly alkaline environment, ensuring efficient cleaning without damaging the mirror-like gloss of the ceramic cover. The antistatic agent in the formula effectively eliminates surface static charge, further guaranteeing the cleanliness after cleaning. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the present invention are described in detail below with reference to embodiments. Obviously, the described embodiments are merely some embodiments of the present invention.

[0019] The polymeric additive compound of the present invention can be prepared by physical mixing methods known in the art. For example, polyacrylamide and sodium carboxymethyl cellulose can be prepared into aqueous solutions separately and then mixed in proportion; or, their powders can be added to water sequentially and stirred until completely dissolved.

[0020] This invention does not impose any particular limitations on the molecular weight and degree of substitution of the polyacrylamide and sodium carboxymethyl cellulose; those skilled in the art can select the appropriate ratio based on the desired solution viscosity and suspension capacity. The mass ratio is 1:0.5-1; within this range, the synergistic effect can be effectively established, thereby achieving efficient suspension and removal of particles. Examples of this invention employ combinations of different molecular weights and degrees of substitution, and the results all confirm the superior effect within this preferred ratio range.

[0021] Example 1 A mirror polishing and cleaning agent for mobile phone ceramic cover plates is prepared through the following steps: Raw materials (by weight): Deionized water: 50 parts Alkali: 18 parts potassium hydroxide Chelating agent: 7 parts of HEDP-4 sodium Polymer additives: 5 parts nonionic polyacrylamide (molecular weight approximately 8 million), 2.5 parts sodium carboxymethyl cellulose (degree of substitution 0.7) (mass ratio 1:0.5) Surfactant: 4 parts isomeric tridecyl alcohol polyoxyethylene ether, 3 parts secondary alcohol polyoxyethylene ether Wetting agent: 4 parts of 2,4,7,9-tetramethyl-5-decyn-4,7-diol Penetrant: 3 parts fatty alcohol polyoxyethylene ether (such as JFC-3) Organic solvent: 2 parts ethylene glycol monobutyl ether Antistatic agent: 3 parts isopropanol Corrosion inhibitor: 3 parts of (2-ethylhexyl)polyoxyethylene(4) ether phosphate monoester Preparation method: (1) Add 35 parts of deionized water to the reactor, and add the alkali and chelating agent in sequence at room temperature, stirring until completely dissolved. In another container, dissolve the polymer additive with the remaining 15 parts of deionized water to prepare a uniform and transparent adhesive solution, and then add it to the reactor and stir continuously for 25 minutes.

[0022] (2) Add surfactant, wetting agent, penetrant, organic solvent and antistatic agent to the solution obtained in step (1) in sequence. After the addition is complete, stir at 40°C for 40 minutes.

[0023] (3) Add corrosion inhibitor to the mixture obtained in step (2) and continue to stir gently for 15 minutes.

[0024] (4) Sampling and testing, and after meeting the internal control standards, the material is released and packaged.

[0025] Example 2 A mirror polishing and cleaning agent for mobile phone ceramic cover plates is prepared through the following steps: Raw material composition (by weight): Deionized water: 40 parts Alkali: 10 parts sodium hydroxide, 4 parts sodium carbonate Chelating agent: 5 parts sodium EDTA-4, 2 parts sodium potassium tartrate Polymer additives: 4 parts anionic polyacrylamide (molecular weight approximately 12 million), 4 parts sodium carboxymethyl cellulose (degree of substitution 0.9) (mass ratio 1:1) Surfactant: 5 parts isotridecyl alcohol polyoxyethylene ether, 3 parts polyoxyethylene alkylolamide Wetting agent: Fatty alcohol polyoxyethylene ether (such as AEO-9) 3 parts Penetrant: Sodium succinate sulfonate (e.g., AOT) 2 parts Organic solvent: 2 parts propylene glycol methyl ether Antistatic agent: 2 parts ethanol, 1 part urea Corrosion inhibitor: 2 parts lauryl alcohol polyoxyethylene (4) ether phosphate monoester Preparation method: (1) Add 30 parts of deionized water to the reactor, and add the alkali and chelating agent in sequence at room temperature, stirring until completely dissolved. In another container, dissolve the polymer additive with the remaining 10 parts of deionized water to prepare a homogeneous adhesive solution, and then add it to the reactor and stir continuously for 20 minutes.

[0026] (2) Add surfactant, wetting agent, penetrant, organic solvent and antistatic agent to the solution obtained in step (1) in sequence. After the addition is complete, stir at 35°C for 50 minutes.

[0027] (3) Add corrosion inhibitor to the mixture obtained in step (2) and continue stirring for 10 minutes.

[0028] (4) Sampling and testing, and packaging after passing the test.

[0029] Example 3 A mirror polishing and cleaning agent for mobile phone ceramic cover plates is prepared through the following steps: Raw material composition (by weight): Deionized water: 45 parts Alkali: 15 parts potassium hydroxide Chelating agent: 6.5 parts of HEDP-4 sodium Polymer additives: 3.3 parts nonionic polyacrylamide, 2.7 parts sodium carboxymethyl cellulose (mass ratio 1:0.82) Surfactant: 9 parts of isomeric tridecyl alcohol polyoxyethylene ether Wetting agent: (comprising surfactants and penetrants) Penetrant: Fatty alcohol polyoxyethylene ether (JFC-3) 5 parts Organic solvent: 1.5 parts diethylene glycol butyl ether Antistatic agent: 3 parts isopropanol Corrosion inhibitor: 2.5 parts tetraethylene glycol monodecyl ether phosphate Preparation method: (1) Add 30 parts of deionized water to the reactor, and add the alkali and chelating agent in sequence at room temperature, stirring until completely dissolved. In another container, dissolve the polymer additive with the remaining 15 parts of deionized water, prepare a homogeneous adhesive solution, add it to the reactor, and stir for 30 minutes.

[0030] (2) Add surfactant, penetrant, organic solvent and antistatic agent in sequence. After the addition is complete, stir at 30°C for 45 minutes.

[0031] (3) Add corrosion inhibitor and continue stirring for 15 minutes.

[0032] (4) Sampling and testing, and packaging after passing the test.

[0033] Example 4 A mirror polishing and cleaning agent for mobile phone ceramic cover plates is prepared through the following steps: The difference from Example 3 is that the chelating agent, sodium HEDP-4 (6.5 parts), is replaced with an equal amount of sodium EDTA-4 (6.5 parts). The remaining components and preparation methods are the same as in Example 3.

[0034] The above description is merely a specific embodiment of the present invention and is not intended to limit the invention. Those skilled in the art will recognize that the components can be flexibly adjusted based on the formulation concept of the present invention. For example, in some specific embodiments of the present invention, the selected surfactant or penetrant itself can also provide good wetting properties. When a fatty alcohol polyoxyethylene ether substance with good water solubility is selected as a penetrant, it also functions as a wetting agent. In this case, the amount of independent wetting agent added can be reduced accordingly to achieve a better balance between cost and performance.

[0035] Comparative Example 1 The difference from Example 1 is that only 5 parts of nonionic polyacrylamide were used as the polymeric additive, and sodium carboxymethyl cellulose was not added. The remaining components and preparation methods are the same as in Example 1.

[0036] Comparative Example 2 The difference from Example 1 is that the mass ratio of polyacrylamide to sodium carboxymethyl cellulose in the polymeric additives is 1:1.2. The remaining components and preparation methods are the same as in Example 1.

[0037] Comparative Example 3 The difference from Example 1 is that the mass ratio of polyacrylamide to sodium carboxymethyl cellulose in the polymeric additives is 1:0.3. The remaining components and preparation methods are the same as in Example 1.

[0038] Comparative Example 4 The difference from Example 1 is that the isooctanol polyoxyethylene ether phosphate corrosion inhibitor is replaced with an equal amount of benzotriazole. The remaining components and preparation methods are the same as in Example 1.

[0039] Performance testing: 1. Cleaning rate test Mass analysis was used for determination. Using a precision analytical balance, the mass of the zirconia ceramic cover plate after treatment with diamond polishing fluid and drying was weighed before and after cleaning. The cleaning rate (%) was calculated using the formula: Cleaning rate (%) = [(mass before cleaning - mass after cleaning) / mass of attached dirt] × 100%.

[0040] 2. Secondary adsorption test of particles The optical particle counting method was used for determination. A particle size analyzer equipped with automated analysis software was used to perform a full-area scan of the cleaned and dried ceramic cover plate mirror surface, counting the number of particles larger than 0.5 μm per unit area (cm²). This value directly characterizes the effectiveness of the cleaning agent in preventing secondary particle adsorption.

[0041] 3. Corrosion test The gloss change rate method was used for evaluation. A specular gloss meter with an incident angle of 60° was used to measure the gloss value at the same position on the ceramic cover before and after cleaning. The gloss retention rate (%) was calculated using the formula: Gloss retention rate (%) = (Gloss value after cleaning / Gloss value before cleaning) × 100% to accurately evaluate the protective performance of the cleaning agent on the product's appearance.

[0042] 4. Suspension stability test The static observation method was used for evaluation. The freshly prepared cleaning agent sample was placed in a 50 mL stoppered colorimetric tube and left to stand at 25°C for 24 hours. The suspension stability was determined by visually observing and recording whether the sample showed stratification or precipitation.

[0043] Performance test results

[0044] All embodiments of this invention exhibit superior and balanced performance in terms of cleaning efficiency, prevention of secondary particle adsorption (low particle residue), gloss protection (non-destructive corrosion), and suspension stability. All performance indicators are significantly better than the comparative examples. This invention develops a mirror-polishing cleaning agent for mobile phone ceramic cover plates, which, through innovative formulation design, balances cleaning efficiency with substrate protection.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A mirror polishing and cleaning agent for mobile phone ceramic cover plates, characterized in that, The raw materials include the following parts by weight: 12-22 parts alkali, 7-14 parts surfactant, 5-8 parts polymeric additive, 6-8 parts chelating agent, 3-7 parts wetting agent, 2-4 parts corrosion inhibitor, 2-5 parts penetrant, 3-4 parts antistatic agent, 1-3 parts organic solvent, and 30-50 parts deionized water.

2. The mobile phone ceramic cover plate mirror polishing and cleaning agent according to claim 1, characterized in that, The alkali is at least one selected from sodium hydroxide, potassium hydroxide, sodium carbonate, and sodium phosphate.

3. The mirror polishing and cleaning agent for mobile phone ceramic cover plates according to claim 1, characterized in that, The surfactant is at least one of secondary alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, and polyoxyethylene alkyl alcohol amide.

4. The mirror polishing and cleaning agent for mobile phone ceramic cover plates according to claim 1, characterized in that, The polymeric additive is a compound of nonionic or anionic polyacrylamide and sodium carboxymethyl cellulose, with a mass ratio of 1:0.5-1.

5. The mobile phone ceramic cover plate mirror polishing and cleaning agent according to claim 1, characterized in that, The chelating agent is at least one selected from sodium EDTA-4, sodium HEDP-4, sodium ethylenediamine di-o-hydroxyphenylacetate, and sodium potassium tartrate.

6. The mobile phone ceramic cover plate mirror polishing and cleaning agent according to claim 1, characterized in that, The corrosion inhibitor is an organophosphate corrosion inhibitor.

7. The mobile phone ceramic cover plate mirror polishing and cleaning agent according to claim 1, characterized in that, The antistatic agent is at least one of ethanol, isopropanol, sodium nitrate, and urea.

8. The mirror polishing and cleaning agent for mobile phone ceramic cover plates according to claim 1, characterized in that, The organic solvent is at least one of ethylene glycol monobutyl ether, tetrahydrofurfuryl alcohol, and propylene glycol methyl ether.

9. The mirror polishing and cleaning agent for mobile phone ceramic cover plates according to claim 1, characterized in that, The surfactant comprises isotretinoin polyoxyethylene ether, the chelating agent is sodium HEDP-4, and the mass ratio of isotretinoin polyoxyethylene ether to sodium HEDP-4 is 0.5:1 to 1.5:

1.

10. A method for preparing the mirror polishing and cleaning agent for mobile phone ceramic cover plates as described in any one of claims 1-9, characterized in that, Includes the following steps: (1) Add two-thirds of the total amount of deionized water to the reactor, then add the alkali and chelating agent in sequence and stir to dissolve; then add the polymer auxiliary agent solution that has been dissolved in the remaining deionized water in advance and stir for 20-30 minutes. (2) Add surfactant, wetting agent, penetrant, organic solvent and antistatic agent to the solution obtained in step (1) in sequence. After the addition is complete, stir for 30-50 minutes. (3) Add corrosion inhibitor to the mixture obtained in step (2) and continue stirring for 10-20 minutes; (4) Sampling and testing, material feeding and packaging.

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