Film separating agent and preparation method thereof
By preparing a film separation agent containing inorganic alkali, chelating agent, buffer and penetrant, the problem of difficult rapid separation of film layers without damaging the substrate during the production process of coated products is solved, realizing rapid reuse of substrate and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-25
- Publication Date
- 2026-04-07
AI Technical Summary
In the existing technology, the coating layer is difficult to separate quickly without damaging the substrate during the production process, which makes it impossible to effectively reuse defective products and increases production costs.
A membrane separation agent is prepared by means of a combination of inorganic alkali, chelating agent, buffer, surfactant and penetrant through a specific ratio and stirring process, which is used to quickly separate membrane layers without damaging the substrate.
It achieves rapid separation of the membrane layer without damaging the substrate, improves the reusability of the substrate, reduces production costs, and maintains the performance of the substrate. The separating agent has a long service life and the preparation method is simple.
Smart Images
Figure CN121801641A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of membrane separation technology, and specifically to a membrane separation agent and its preparation method. Background Technology
[0002] With the rapid development of consumer electronics, the demand for touchscreens continues to rise. The demand is particularly significant in the personal consumer electronics sector, especially for smartphones, tablets, and wearable devices. Multi-touch technology has become a standard feature in touchscreen designs, and its adoption will further increase as display panel and processor performance improves. The high-definition touchscreen market is expected to experience explosive growth, offering better visual experiences and higher resolutions.
[0003] Since touchscreens in consumer electronics are primarily made of glass, a protective coating is applied to the glass surface to improve performance and extend its lifespan. This coating forms a hard and wear-resistant protective film on the touchscreen surface. This coating effectively protects the touchscreen from scratches and wear, making it more durable.
[0004] A coating is a layer applied to the screen of electronic products. Its main function is to reduce fingerprints and smudges on the screen and improve its ease of cleaning.
[0005] The principle of coating is to apply a layer of nano-chemical materials to the outer surface of glass, reducing the surface tension of the glass and decreasing the contact area between dust and the glass surface by 90%, thus providing strong hydrophobic, oil-resistant, and fingerprint-resistant capabilities. This coating allows the screen glass panel to maintain a clean and bright appearance for a long time. The product characteristics of coating include stain resistance, scratch resistance, thin film layer, and wear resistance. It is widely used in mobile phones, tablets, smart home touch screen all-in-one machines, and other products.
[0006] In the coating production process of consumer electronics, due to factors such as process environment and operation, products with substandard performance or appearance may be produced. Because the substrate cost is high, these defective products are often reused after the surface coating is separated using chemical agents. How to achieve rapid separation of the coating without damaging the substrate is a technical problem that existing technologies need to solve. Summary of the Invention
[0007] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a membrane separation agent and its preparation method, thereby solving the technical problem of how to achieve rapid separation of membranes without damaging the substrate in the prior art.
[0008] To achieve the above-mentioned technical objectives, the present invention provides a membrane separation agent, which, by mass percentage, comprises 30%-40% inorganic alkali, 1%-5% chelating agent, 5%-10% buffer, 0.5%-1% surfactant, 5%-10% permeater, and the balance being water.
[0009] In any embodiment, the inorganic base is one or both of potassium hydroxide and sodium hydroxide; the chelating agent is one or more of ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and hydroxyethylethylenediaminetriacetic acid.
[0010] In any embodiment, the buffer is one or more of potassium gluconate, sodium gluconate, potassium citrate, and sodium citrate.
[0011] In any embodiment, the penetrant is one or both of hydroxyethylidene diphosphonic acid and aminotrimethylene phosphonic acid; and / or, the surfactant is one or both of monoethanolamine and triethanolamine.
[0012] In any embodiment, the refractive index of the membrane separation agent is 45~50.
[0013] In any embodiment, the density of the membrane separation agent is 1.174-1.275 g / cm³. 3 .
[0014] Furthermore, the present invention also proposes a method for preparing the above-mentioned membrane separation agent, comprising the following steps: S1. Add a chelating agent to water and stir to obtain a chelation system; S2. Add surfactant, penetrant and buffer to water and stir until dissolved, then mix with the chelation system to obtain a mixed system; S3. Add an inorganic alkali to the mixture and stir to obtain the membrane separation agent.
[0015] In any embodiment, in step S1, the stirring time is 30-60 min and the stirring rate is 300-500 rpm.
[0016] In any embodiment, in step S2, the stirring rate is 300-500 rpm.
[0017] Compared with existing technologies, the beneficial effects of this invention include: the coating process requires high adhesion, and most of the film materials are stable materials such as silicon and carbon, making film separation relatively difficult. Commercially available film separation agents have the following problems with the peeling effect on ultra-hard or multi-layered products: low efficiency (8~10 hours), unclean film glass, and damage to the substrate (product flatness exceeds tolerance: requirement <200um). The film separation agent proposed in this invention, through the combined action of alkali, chelating agents, and other components, rapidly separates the film glass without damaging the substrate or affecting its performance, thus enabling substrate reuse and significantly reducing industry costs. It achieves a film peeling rate of 1.5 hours / cycle without damaging the substrate (glass), realizing rapid film separation without damaging the substrate. The film separation agent also has the advantages of long service life, simple preparation method, and low cost. Attached Figure Description
[0018] Figure 1 This is a photograph of a mobile phone glass screen after treatment with the film separation agent according to Embodiment 6 of the present invention.
[0019] Figure 2 This is a photograph of a mobile phone glass screen after treatment with the film separation agent according to Embodiment 1 of the present invention.
[0020] Figure 3 This is a photograph of a mobile phone glass screen after treatment with the film separation agent according to Example 9 of the present invention. Detailed Implementation
[0021] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60~120 and 80~110 are listed for a specific parameter, it is also expected that ranges of 60~110 and 80~120 are also included. Furthermore, if minimum range values of 1 and 2 are listed, and if maximum range values of 3, 4, and 5 are listed, then the following ranges are all expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this application, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0~5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.
[0022] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.
[0023] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).
[0024] This specific embodiment provides a membrane separation agent, which, by mass percentage, comprises 30%-40% inorganic base, 1%-5% chelating agent, 5%-10% buffer, 0.5%-1% surfactant, 5%-10% permeate, and the balance being water; the buffer is one or more of potassium gluconate, sodium gluconate, potassium citrate, and sodium citrate; the inorganic base is one or two of potassium hydroxide and sodium hydroxide; the chelating agent is one or more of ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and hydroxyethylethylenediaminetriacetic acid; the permeate is one or two of hydroxyethylidene diphosphonic acid and aminotrimethylenephosphonic acid; the surfactant is one or two of monoethanolamine and triethanolamine; the refractive index of the membrane separation agent is 45-50; and the density of the membrane separation agent is 1.174-1.275 g / cm³. 3 .
[0025] In some embodiments, the membrane separation agent, calculated by mass percentage, includes 40% potassium hydroxide, 5% potassium citrate, 5% potassium gluconate, 5% ethylenediaminetetraacetic acid, 8-10% hydroxyethylidene diphosphonic acid, 0.5-1% monoethanolamine, and 0.5-1% triethanolamine.
[0026] Furthermore, this specific embodiment also proposes a method for preparing the above-mentioned membrane separation agent, including the following steps: S1. Add chelating agent to water and stir for 30-60 minutes at a stirring speed of 300-500 rpm to obtain a chelated system; S2. Add surfactant, penetrant and buffer to water and stir until dissolved, then mix with the chelation system to obtain a mixed system; the stirring speed is 300-500 rpm; S3. Add an inorganic alkali to the mixture and stir to obtain the membrane separation agent. The stirring speed is 1200-1400 rpm.
[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0028] In this invention, the terms "some embodiments," "this embodiment," and examples are used to describe a subset of all possible embodiments. However, it is understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.
[0029] If the application documents contain similar descriptions such as "first / second", the following explanation shall be added: In the following description, the terms "first / second / third" are used only to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.
[0030] In this embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.
[0031] The following describes embodiments of this application. The embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all conventional products that can be obtained commercially.
[0032] The following embodiments provide a membrane separation agent, which, by mass percentage, comprises 30%-40% inorganic base, 1%-5% chelating agent, 5%-10% buffer, 0.5%-1% surfactant, 5%-10% permeate, and the balance being water; the buffer is one or more of potassium gluconate, sodium gluconate, potassium citrate, and sodium citrate; the inorganic base is one or two of potassium hydroxide and sodium hydroxide; the chelating agent is one or more of ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and hydroxyethylethylenediaminetriacetic acid; the permeate is one or two of hydroxyethylidene diphosphonic acid and aminotrimethylenephosphonic acid; the surfactant is one or two of monoethanolamine and triethanolamine; the refractive index of the membrane separation agent is 45-50; and the density of the membrane separation agent is 1.174-1.275 g / cm³.3 .
[0033] Furthermore, the following embodiments also provide a method for preparing the above-mentioned membrane separation agent, comprising the following steps: S1. Add chelating agent to water and stir for 40 min at a stirring speed of 400 rpm to obtain a chelated system; S2. Add surfactant, penetrant and buffer to water and stir until dissolved, then mix with the chelation system to obtain a mixed system; the stirring speed is 400 rpm; S3. Add an inorganic alkali to the mixture and stir to obtain the membrane separation agent. The stirring speed is 1300 rpm.
[0034] The specific components and dosages of each embodiment are shown in Tables 1 and 2.
[0035] For example, Example 1 proposes a membrane separation agent, which, by mass percentage, comprises 15% potassium hydroxide, 15% sodium hydroxide, 2% ethylenediaminetetraacetic acid, 3% hydroxyethylethylenediaminetriacetic acid, 2% potassium citrate, 3% sodium gluconate, 0.5% monoethanolamine, 0.5% triethanolamine, 8% hydroxyethylidene diphosphonic acid, and the balance being water.
[0036] Table 1. Content of some components of the membrane separation agent in Examples 1-9
[0037] Table 2 Content of some components of the membrane separation agent in Examples 1-9
[0038] Experimental results of the membrane separation agent: The test was conducted by heating and immersion in a laboratory constant temperature water bath. The test process temperature was 70-80℃, the treatment time was 1.5-2 hours, and the test concentration was the original solution. The peeling of the ultra-hard membrane was tested by observing the haze, transmittance, and appearance (visual inspection) of the glass surface.
[0039] Haze and transmittance testing: Haze meter (YJD-3500B).
[0040] Glass material: Ultra-hard coated mobile phone glass screen. Each set of examples processed 20 mobile phone glass screens. The results are shown in Table 3.
[0041] Table 3 shows the experimental comparison results.
[0042] Table 3 shows that Example 6 achieved the best peeling effect, with a transmittance of 91.89%, haze of 0.15, no unremoved residue, no blue or discoloration, and a 100% appearance. Other examples also achieved good film separation, but with slightly higher haze, transmittance, and appearance yield. In Examples 1-5, the alkaline system was progressively strengthened, shortening the time and significantly improving the peeling effect, but this resulted in blue or discoloration of the microcrystalline glass, leading to poor appearance. Example 6 further optimized the process by using potassium hydroxide as the strong etchant and incorporating potassium-ion-containing buffers in the overall separator system. This allowed the separator to provide potassium ions during use, thus improving the stability of the strong alkali peeling effect on the ultra-hard film layer. This resulted in no damage to the product and no blue or discoloration issues, demonstrating that using only potassium hydroxide can avoid the blue or discoloration problem. Examples 6-9 all showed better peeling effects. Example 7 had 2% less buffer content than Example 8, resulting in a lower appearance yield, indicating that the same peeling time affected the peeling speed. Example 9 used 2% less penetrant than Example 8, resulting in higher haze and lower yield, indicating that the same amount of time affected the peeling speed in terms of peeling effect. Figure 1-3 It can also be seen that the product treated in Example 6 did not turn blue or colored, while the product treated in Example 1 had the problem of turning blue or colored; the product in Example 9 had the problem of not being completely removed.
[0043] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A membrane separation agent, characterized in that, The composition, calculated by mass percentage, includes 30%-40% inorganic alkali, 1%-5% chelating agent, 5%-10% buffer, 0.5%-1% surfactant, 5%-10% penetrant, and the remainder is water.
2. The membrane separation agent according to claim 1, characterized in that, The inorganic base is one or both of potassium hydroxide and sodium hydroxide; the chelating agent is one or more of ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and hydroxyethylethylenediaminetriacetic acid.
3. The membrane separation agent according to claim 1, characterized in that, The buffer is one or more of potassium gluconate, sodium gluconate, potassium citrate, and sodium citrate.
4. The membrane separation agent according to claim 1, characterized in that, The penetrant is one or both of hydroxyethylidene diphosphonic acid and aminotrimethylene phosphonic acid; and / or, the surfactant is one or both of monoethanolamine and triethanolamine.
5. The membrane separation agent according to claim 1, characterized in that, The refractive index of the membrane separation agent is 45~50.
6. The membrane separation agent according to claim 1, characterized in that, The density of the membrane separation agent is 1.174-1.275 g / cm³. 3 .
7. A method for preparing the membrane separation agent according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Add a chelating agent to water and stir to obtain a chelation system; S2. Add surfactant, penetrant and buffer to water and stir until dissolved, then mix with the chelation system to obtain a mixed system; S3. Add an inorganic alkali to the mixture and stir to obtain the membrane separation agent.
8. The method for preparing the membrane separation agent according to claim 7, characterized in that, In step S1, the stirring time is 30-60 min and the stirring speed is 300-500 rpm.
9. The method for preparing the membrane separation agent according to claim 7, characterized in that, In step S2, the stirring rate is 300-500 rpm.
10. The method for preparing the membrane separation agent according to claim 7, characterized in that, In step S3, the stirring rate is 1200-1400 rpm.