Glass low-alkalinity 3A film stripping solution with silk-screen printing ink and preparation method of glass low-alkalinity 3A film stripping solution

Abstract

The invention provides a glass low-alkalinity 3A (AR, AF and AG) film stripping solution with silk-screen printing ink and a preparation method of the glass low-alkalinity 3A (AR, AF and AG) film stripping solution, and belongs to the technical field of glass surface treatment. The printing ink comprises the following components in percentage by weight: 15%-20% of a chelating agent, 2%-5% of a dispersing agent, 0.1%-0.5% of a printing ink protective agent, 0.5%-1% of an antistatic agent, 0.5%-1% of a low-foam wetting agent, 1%-1.5% of a penetrating agent and 5%-10% of a pH buffering agent, the pH (Potential of Hydrogen) is 12.0 to 13.0; wherein the chelating agent is a chelating system formed by organic acid salt and organic acid; the printing ink protective agent is any one or more of alkyl acrylate, polyacrylamide and sodium carboxymethyl cellulose. The glass low-alkalinity 3A film stripping solution with the silk-screen printing ink has the advantages that 3A (AR, AF and AG) films are stripped, a glass substrate and the silk-screen printing ink are not damaged, and the glass low-alkalinity 3A film stripping solution is high in cleaning capacity and easy to rinse after glass surface stripping, and is suitable for stainless steel tank body soaking treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of glass surface treatment, and more particularly to a low-alkalinity 3A film stripping solution for glass with silk-screen ink and a preparation method thereof. Background Art

[0002] Glass 3A (AG, AR, AF) coating technology, as a commonly used application technology for glass surface processing today, AG spraying usually refers to the process of spraying an anti-glare (Anti-Glare) spray liquid on the glass surface to form an anti-glare coating. The AG spray liquid is mainly composed of inorganic metal oxides, photoinitiators, leveling agents and solvents mixed in a certain proportion. It is widely used in electronic equipment screens, optical lenses, car displays and other fields; AR stands for anti-reflective film, also known as anti-reflective film, which is an optical film that can reduce or eliminate the reflected light on the optical surface. It is mainly composed of calcium fluoride, oxide It is composed of silicon, silicon nitride, magnesium fluoride, titanium dioxide, aluminum oxide, zirconium dioxide and ZnS ceramics, which can improve the transmittance of light and reduce the reflectivity. By coating one or more layers of thin films with different refractive indices on the surface of optical glass elements, the principle of light interference is used to make the light waves reflected from the front and back surfaces of the film interfere with each other, thereby effectively reducing the reflected light and increasing the transmittance of light. AF stands for high-transmittance anti-fingerprint AF film, which is a fluorine-containing coating formulated with a specially structured fluorosilicone resin. It can effectively prevent fingerprints, oil and dust, and has a very high light transmittance, without the foggy feeling of frosted film.

[0003] Since the glass surface has a variety of film layers, including silk screen ink, AF, AG, AR and other film layers, it determines the difference from the traditional glass stripping and deinking process, and needs to take into account a variety of requirements, including protecting silk screen ink, quickly and thoroughly stripping the 3A (AG, AR, AF) film layer on the glass surface. For example, Chinese patent CN110453224A reports a process of stripping in sequence using a variety of stripping solutions. In general, silk screen ink has properties such as alkali resistance and solvent resistance, and stripping 3A (AG, AR, AF) film layers generally requires high-strength alkali and high chelating properties to achieve the stripping effect. Conventional stripping solutions use sodium hydroxide and potassium hydroxide as alkali donors, which are highly aggressive to the relevant film layers and silk screen inks. EDTA-4Na, sodium citrate, potassium sodium tartrate, sodium gluconate are used as chelating agents and are compounded with organic ammonium salts such as monoethanolamine / triethanolamine as the main raw materials. The alkalinity is generally maintained at 15 % (calculated as potassium hydroxide) or more, but has the following drawbacks in glass surface treatment applications: 1. Due to its high alkalinity, stripping screen inks from glass surfaces can easily damage the ink, and prolonged soaking can cause the ink to fall off. 2. Under high alkalinity conditions, the high chelating agent content can easily corrode, scratch, and cause a bluish discoloration on the glass surface. 3. High alkalinity and high chelating agent content require high temperatures (preferably ≤ 85°C) and short soaking times (preferably ≤ 10 minutes), otherwise the glass can be severely scratched. Chinese patent CN109796138A describes an acidic stripping solution that can completely remove NCVM films at room temperature, but it can still damage screen inks. Summary of the Invention

[0004] To address the aforementioned technical issues in the prior art, the present invention aims to provide a low-alkalinity stripping solution for 3A (AR, AF, AG) films on glass with screen-printed inks, and its preparation method. This solution utilizes a chelating system composed of an organic acid salt and an organic acid in a specific mass ratio, with sodium carbonate and / or potassium carbonate used as pH buffers to create a low-alkalinity environment with a pH of 12-13. The stripping process is conducted at 80-85°C, enabling efficient stripping of 3A (AR, AF, AG) films without damaging the screen-printed ink. The present invention utilizes multiple low-foaming polyether surfactants as active agents, achieving environmentally friendly, mild, and low-foaming properties while maintaining film surface wetting without compromising stripping performance.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A stripping solution for a low-alkalinity 3A film layer on glass with silk-screen ink comprises the following components, calculated by weight percentage: 15%-20% of a chelating agent, 2%-5% of a dispersant, 0.1%-0.5% of an ink protective agent, 0.5%-1% of an antistatic agent, 0.5%-1% of a low-foaming wetting agent, 1%-1.5% of a penetrant, and 5%-10% of a pH buffer; the pH value is 12.0-13.0; wherein the chelating agent is a chelate system formed by an organic acid salt and an organic acid, and the ink protective agent is any one or more of alkyl acrylate, polyacrylamide, and sodium carboxymethyl cellulose.

[0007] Furthermore, the organic acid includes any one or more of EDTA and citric acid.

[0008] Furthermore, the organic acid salt includes any one or more of EDTA-4Na, NTA-3Na, potassium sodium tartrate, potassium gluconate, and potassium citrate.

[0009] Furthermore, the dispersant includes at least one of sodium polyacrylates and acrylic acid-acrylate-sulfonate terpolymers.

[0010] The specific model of the sodium polyacrylate dispersant is not limited, and may be, for example, PAAS and PA25CL.

[0011] Furthermore, the antistatic agent includes at least one of polyethylene glycol and ethoxylated lauryl amide. The polyethylene glycol may be PEG-400 or PEG-600.

[0012] Furthermore, the low-foam wetting agent includes at least one of trans polyether RPE series 1740, fatty alcohol EO-PO block polyether EP2584, propylene glycol block polyether L-64, silicone modified polyether 5840, and fatty alcohol polyether LF-901.

[0013] Furthermore, the penetrant includes at least one of fatty alcohol polyoxyethylene ether JFC series and isomeric alcohol polyoxyethylene ether XL series.

[0014] Furthermore, the ink protecting agent includes at least one of alkyl acrylate, polyacrylamide, and sodium carboxymethyl cellulose.

[0015] Furthermore, the pH buffer includes at least one of potassium carbonate and sodium carbonate.

[0016] Furthermore, the pH of the low-alkalinity stripping solution for 3A (AR, AF, AG) film layer of the glass with silk-screen ink is 12.0-13.0.

[0017] The method for preparing the above-mentioned stripping solution for the low-alkalinity 3A film layer of glass with silk-screen ink comprises the following steps:

[0018] Add chelating agent and organic acid to water and stir to fully react until colorless and transparent, continue stirring, add dispersant, ink protective agent, antistatic agent, low foaming wetting agent, penetrant, pH buffer in turn, stir evenly and fully dissolve to obtain.

[0019] The chelating agent of the present invention is a chelating system formed by an organic acid salt and an organic acid. At least one of sodium carbonate and potassium carbonate serves as a pH buffer. In the system, two reversible chemical reactions, molecular ionization and ion hydrolysis, are used to stabilize the pH of the deplating solution at 12-13. The dispersant quickly disperses and separates the detached 3A (AR, AF, AG) film layer on the glass surface and embeds it into the deplating solution. The antistatic agent weakens the charge of the adsorbed and detached film fragments so that the film fragments have no ability to adsorb on the glass surface. The low-foaming wetting agent wets the 3A (AR, AF, AG) film layer on the glass surface and reduces the surface tension, so that the 3A (AR, AF, AG) film layer quickly swells and pulverizes and embeds it into the deplating solution. The penetrant acts on the glass surface to enable the deplating solution to quickly penetrate into the interior of the 3A (AR, AF, AG) film layer. The ink protective agent protects the screen printing ink on the glass surface. During deplating, the screen printing ink is not corroded by the deplating solution, thereby achieving the effect of deplating without damaging the ink.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention relates to a low-alkalinity 3A (AR, AF, AG) film stripping solution with a pH of 12.0-13.0. Compared to the potassium hydroxide system in the prior art, the pH is lower and can effectively protect the screen printing ink.

[0022] 2. The present invention uses biodegradable raw materials, which are mild to the environment and do not cause environmental pollution.

[0023] 3. The present invention has the effect of quickly and thoroughly stripping 3A (AR, AF, AG) film layers in a low alkalinity environment, and can effectively strip 3A (AR, AF, AG) film layers on glass surfaces.

[0024] 4. The low-alkalinity 3A (AR, AF, AG) film stripping solution of the present invention is friendly to glass and silk-screen ink on the surface of silk-screen glass, does not corrode and destroy the silk-screen ink on the glass surface, and does not damage the glass surface when immersed at working temperature for a long time.

[0025] 5. The low-alkalinity 3A (AR, AF, AG) film stripping solution of the present invention contains a pH buffer, which stabilizes the pH working environment of the 3A (AR, AF, AG) film stripping solution, avoids long-term stripping, and causes large fluctuations in the entire stripping environment, thereby affecting the basic properties of the silk-screen ink on the glass surface and the glass surface (such as corrosion and scratching of the glass surface). DETAILED DESCRIPTION

[0026] The following description sets forth numerous specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific implementations disclosed below.

[0027] A stripping solution for a low-alkalinity 3A film layer on glass with silk-screen ink comprises the following components, calculated by weight percentage: 15%-20% of a chelating agent, 2%-5% of a dispersant, 0.1%-0.5% of an ink protective agent, 0.5%-1% of an antistatic agent, 0.5%-1% of a low-foaming wetting agent, 1%-1.5% of a penetrant, and 5%-10% of a pH buffer; the pH value is 12.0-13.0; wherein the chelating agent is a chelate system formed by an organic acid salt and an organic acid, and the ink protective agent is any one or more of alkyl acrylate, polyacrylamide, and sodium carboxymethyl cellulose.

[0028] Furthermore, the organic acid salt includes a mixture of one or more of EDTA-4Na, NTA-3Na, potassium sodium tartrate, potassium gluconate, and potassium citrate.

[0029] Furthermore, the organic acid includes any one or more of citric acid and EDTA.

[0030] Furthermore, the dispersant includes at least one of sodium polyacrylate and acrylic acid-acrylate-sulfonate terpolymer, wherein the specific model of the sodium polyacrylate dispersant is not limited, for example, it can be PAAS and PA25CL.

[0031] Furthermore, the ink protecting agent includes at least one of alkyl acrylate, polyacrylamide, and sodium carboxymethyl cellulose.

[0032] Furthermore, the antistatic agent includes at least one of polyethylene glycol and ethoxycinnamic amide. The polyethylene glycol can be PEG-400 or PEG-600.

[0033] Furthermore, the low-foam wetting agent includes at least one of trans polyether RPE series 1740, fatty alcohol EO-PO block polyether EP2584, propylene glycol block polyether L-64, silicone modified polyether 5840, and fatty alcohol polyether LF-901.

[0034] Furthermore, the penetrant includes at least one of JFC and XL-80.

[0035] Furthermore, the pH buffer includes at least one of sodium carbonate and potassium carbonate.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] It should be noted that the raw materials, instruments, etc. involved in the present invention are all common commercially available products.

[0038] Table 1 Formulations of Examples 1-5 and Comparative Examples 1-5

[0039]

[0040]

[0041] Comparative Example 4

[0042] The formula is the same as that of Example 4. The preparation method is as follows: add a chelating agent, a dispersant, an ink protective agent, an antistatic agent, a low-foaming wetting agent, a penetrant, and a pH buffer into water, stir evenly and fully dissolve to obtain the product.

[0043] The preparation methods of the remaining embodiments and comparative examples are as follows:

[0044] Add the chelating agent to water according to the amount in Table 1 and stir to fully react until it becomes colorless and transparent. Continue stirring, and add the dispersant, ink protective agent, antistatic agent, low-foaming wetting agent, penetrant, and pH buffer in sequence, stir evenly and fully dissolve.

[0045] The performance of the deplating solutions prepared in the above examples and comparative examples was tested as follows:

[0046] pH value detection: data detection through digital pH meter

[0047] The stripping effect of low alkalinity 3A (AR, AF, AG) film layer: Through the laboratory constant temperature water bath, immersion stripping test, stripping process temperature: 80-85℃, stripping time: 20-25min, stripping concentration: original solution, glass surface haze, transmittance, water drop angle test film peeling situation.

[0048] Water drop angle test: contact angle meter (SDC-200S).

[0049] Safety test of silk screen ink: The silk screen ink changes in 100 grids, and the shedding of 100 grids of silk screen ink is observed under a mirror microscope to determine the safety of the ink.

[0050] Haze and transmittance test: haze meter (YJD-3500B).

[0051] Glass material: Data comparison of clear glass and coated glass (Kunlun Microcrystalline, Chongqing Xinjing Special Glass Co., Ltd.) is shown in Table 2.

[0052] Table 2

[0053]

[0054] The experimental comparison results are shown in Table 3.

[0055] Table 3

[0056]

[0057] As can be seen from the data in Table 3, Example 4 has the best stripping effect, in which the 100-grid ink is intact, with a water drop angle of 9°, a transmittance of 91.16, and a haze of 0.15, which are consistent with the data for white glass pieces. The other examples can also achieve good stripping effects. In Comparative Example 4, the content of the penetrant is reduced, and the changes in various data, including a significant increase in haze, indicate that the stripping effect is affected by the penetration rate of the stripping solution into the film layer. By comparing the data of Examples 1 and 2 and Comparative Examples 1 and 2, alkyl acrylate and sodium carboxymethyl cellulose protect the ink slightly better. Replacing alkyl acrylate with sodium carboxymethyl cellulose causes significant damage to the 100-grid ink. By comparing Example 1 and Comparative Example 1, it is found that EDTA-4Na and NTA-3Na have an effect on stripping. The haze and transmittance of Example 1 are significantly lower than those of the Comparative Example. In Example 5 and Comparative Example 5, the effects of potassium carbonate and sodium carbonate on the stripping effect are analyzed. From the haze and transmittance data, the data of Example 5 is smaller than that of Comparative Example 5, so the stripping effect of Example 5 is better. It was found that through the control experiment of Example 4 and Comparative Example 6, when no ink protective agent was added, obvious ink damage occurred in the ink 100-grid test on the glass surface.

[0058] The deplating effect of different types of coated glass pieces was compared using the deplating solution of Example 4, as shown in Table 4.

[0059] Table 4

[0060]

[0061] The data of each substrate glass after stripping are shown in Table 5.

[0062] Table 5

[0063]

[0064]

[0065] Using Example 4, various types of coated glass were tested for 3A stripping. The data are shown in Table 5. As can be seen, the stripping effect met the requirements and had no effect on ink damage. This demonstrates that the stripping solution provided by the present invention has excellent stripping effects and is suitable for stripping various types of 3A coatings, with a wide range of applications.

[0066] The present invention adopts biodegradable raw materials, is mild to the environment and does not cause environmental pollution.

[0067] The present invention has the effect of quickly and thoroughly stripping the 3A (AR, AF, AG) film layer in a low-alkalinity environment, and can well be used for stripping the 3A (AR, AF, AG) film layer on the glass surface.

[0068] The low-alkalinity 3A (AR, AF, AG) film stripping solution of the present invention is friendly to glass and silk-screen ink on the surface of silk-screen glass, does not corrode and destroy the silk-screen ink on the glass surface, and does not damage the glass surface when immersed at working temperature for a long time.

[0069] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A low alkalinity 3A film stripping solution for glass with screen printing ink, characterized in that: The invention comprises the following components by weight percentage: 15%-20% of a chelating agent, 2%-5% of a dispersant, 0.1%-0.5% of an ink protective agent, 0.5%-1% of an antistatic agent, 0.5%-1% of a low-foaming wetting agent, 1%-1.5% of a penetrant, and 5%-10% of a pH buffer; the pH value is 12.0-13.0; wherein the chelating agent is a chelate system formed by an organic acid salt and an organic acid; and the ink protective agent is any one or more of alkyl acrylate, polyacrylamide, and sodium carboxymethyl cellulose.

2. The low alkalinity 3A film stripping solution for glass with screen printing ink according to claim 1, characterized in that: The organic acid salt includes one or more of EDTA-4Na, NTA-3Na, potassium sodium tartrate, potassium gluconate, and potassium citrate.

3. The low alkalinity 3A film stripping solution for glass with screen printing ink according to claim 1, characterized in that: The organic acid includes any one or more of EDTA and citric acid.

4. The low alkalinity 3A film stripping solution for glass with screen printing ink according to claim 1, characterized in that: The dispersant includes at least one of sodium polyacrylates and acrylic acid-acrylate-sulfonate terpolymers.

5. The low alkalinity 3A film stripping solution for glass with screen printing ink according to claim 1, characterized in that: The antistatic agent includes at least one of polyethylene glycol and ethoxylated lauryl amide.

6. The low alkalinity 3A film stripping solution for glass with silk screen ink according to claim 1, characterized in that: The low-foam wetting agent includes at least one of trans polyether RPE series 1740, fatty alcohol EO-PO block polyether EP2584, propylene glycol block polyether L-64, silicone modified polyether 5840, and fatty alcohol polyether LF-901.

7. The low alkalinity 3A film stripping solution for glass with screen printing ink according to claim 1, characterized in that: The penetrant includes at least one of fatty alcohol polyoxyethylene ether JFC series and isomeric alcohol polyoxyethylene ether XL series.

8. The low alkalinity 3A film stripping solution for glass with screen printing ink according to claim 1, characterized in that: The pH buffer comprises at least one of potassium carbonate and sodium carbonate.

9. The method for preparing a stripping solution for a low-alkalinity 3A film layer on glass with screen printing ink according to any one of claims 1 to 8, comprising the following steps: Add organic acid salt and organic acid into water, stir and react thoroughly until colorless and transparent, continue stirring, add dispersant, ink protective agent, antistatic agent, low foaming wetting agent, penetrant, pH buffer in sequence, stir evenly and fully dissolve to obtain the product.

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