A glass stripping agent, its preparation method and application

Abstract

This invention provides a glass stripping agent, its preparation method, and its application. The glass stripping agent of this invention comprises sodium fluorophosphate, formamide, boric acid, glycerol, and water. This invention uses sodium fluorophosphate and formamide as dissolving components in the stripping agent under weakly acidic conditions, allowing it to dissolve the titanium dioxide coating layer on the glass surface at room temperature. Sodium fluorophosphate and formamide have a synergistic dissolving effect; when combined in a certain proportion, they significantly accelerate the dissolution of the titanium dioxide coating layer. This invention also provides a method for preparing the glass stripping agent and its application.

Description

Technical Field

[0001] This invention belongs to the field of special glass production technology, specifically relating to a glass stripping agent, its preparation method, and its application. Background Technology

[0002] Lithium-aluminum-silicon glass (LCS) is a special type of glass containing elements such as lithium, aluminum, and silicon in its chemical composition. This glass possesses excellent thermal, optical, and mechanical properties and is widely used in optical instruments, electronic equipment, aerospace, and other fields. A titanium dioxide coating is typically applied to LCS to improve its hardness, chemical stability, and optical properties. During the surface coating process, various process factors can lead to defective products. To reduce material costs, these defective products undergo a stripping process to achieve reuse.

[0003] Currently, commercially available stripping agents commonly use strong acids, and the stripping process is carried out under heated conditions. While these stripping agents have advantages such as good stripping effect and fast stripping speed, they can easily corrode lithium aluminum silicon glass, causing the glass to turn blue or become cloudy.

[0004] Therefore, it is necessary to develop a glass stripper that does not corrode lithium aluminum silicon glass and can remove the titanium dioxide coating layer on the glass surface. Summary of the Invention

[0005] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. To this end, the present invention provides a glass stripping agent that does not corrode lithium aluminum silicon glass and can remove the titanium dioxide coating layer from the glass surface.

[0006] The present invention also provides a method for preparing a glass stripping agent.

[0007] This invention also provides an application of a glass stripping agent.

[0008] The present invention also provides a method for removing titanium dioxide coating from a glass surface.

[0009] A first aspect of the present invention provides a glass stripping agent, comprising, by weight, the following components:

[0010] Sodium fluorophosphate: 3 to 5 parts

[0011] Formamide: 3 to 5 parts

[0012] Boric acid: 3 to 5 parts

[0013] Glycerin: 3 to 5 parts

[0014] Water: 80 to 88 parts.

[0015] One of the technical solutions of the present invention concerning glass stripping agents has at least the following beneficial effects:

[0016] This invention employs sodium fluorophosphate and formamide as dissolving components in a stripping agent under weakly acidic conditions, enabling the titanium dioxide coating on the glass surface to dissolve in the stripping agent at room temperature. Sodium fluorophosphate and formamide have a synergistic dissolving effect; when combined in a certain proportion, they significantly accelerate the dissolution of the titanium dioxide coating.

[0017] In the glass stripping agent of this invention, boric acid is a monobasic weak acid that has no corrosive effect on lithium aluminum silicon glass. Adding glycerol to the boric acid solution causes an addition reaction between the boric acid and glycerol, forming a more stable complex and thus enhancing the acidity of the boric acid. Sodium fluorophosphate and formamide exhibit better stripping effects in a more acidic environment.

[0018] Test results show that the glass stripping agent of the present invention can remove the titanium dioxide coating layer on the surface of lithium aluminum silicon glass at room temperature (around 25°C), and it does not corrode the lithium aluminum silicon glass, nor does it cause the glass to turn blue or become cloudy.

[0019] According to some embodiments of the present invention, the product comprises the following components in parts by weight:

[0020] Sodium fluorophosphate: 4 parts

[0021] Formamide: 4 parts

[0022] Boric acid: 4 parts

[0023] Glycerin: 4 parts

[0024] Water: 84 portions.

[0025] According to some embodiments of the present invention, the sodium fluorophosphate includes at least one of sodium monofluorophosphate and sodium hexafluorophosphate.

[0026] A second aspect of the present invention provides a method for preparing a glass stripping agent, wherein sodium fluorophosphate, formamide, boric acid and glycerol are added to water under stirring conditions.

[0027] One technical solution of the present invention relating to the preparation method of glass stripping agent has at least the following beneficial effects:

[0028] The preparation method of the present invention does not require expensive equipment and complex process control, the reaction conditions are not harsh, the raw materials are readily available, the production cost is low, and it is easy to industrialize.

[0029] A third aspect of the present invention provides the application of a glass stripping agent in the stripping of titanium dioxide coatings on glass surfaces.

[0030] The present invention relates to the application of a glass stripping agent in the stripping of titanium dioxide coatings on glass surfaces, and has at least the following beneficial effects:

[0031] The stripping agent removes titanium dioxide without corroding the lithium aluminum silicon glass. This preserves the glass's fundamental properties, ensuring other performance characteristics remain unaffected and helping to maintain its original transparency and optical properties.

[0032] Because this stripping agent has no adverse effects on glass, it will not cause the glass to turn blue or become cloudy during use. This is very important for applications that require a high level of glass surface finish, such as display technology or optical devices.

[0033] The stripping agent works at room temperature (around 25°C), which helps simplify the process and reduce energy consumption. Compared to some processes that require high-temperature treatment, it improves production efficiency and energy saving.

[0034] Depending on the formulation, the proportions of each component can be adjusted to meet different process and application requirements. This adjustability helps to adapt to different types of lithium aluminum silicon glass and titanium dioxide coatings.

[0035] The fourth aspect of the present invention provides a method for removing a titanium dioxide coating layer on a glass surface, comprising the following steps: immersing the glass to be removed in a glass stripping agent.

[0036] The present invention provides a method for removing titanium dioxide coatings from glass surfaces that does not require expensive equipment or complex process control, has undemanding reaction conditions, and is easy to operate.

[0037] According to some embodiments of the present invention, the temperature of the soaking treatment is 20°C to 35°C.

[0038] According to some embodiments of the present invention, the soaking time is 5 min to 10 min.

[0039] According to some embodiments of the present invention, the glass to be decoated comprises lithium aluminum silicon glass.

[0040] According to some embodiments of the present invention, the method further includes rinsing and drying the glass after the soaking treatment. Detailed Implementation

[0041] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the embodiments, but the present invention is not limited to these embodiments.

[0042] In some embodiments of the present invention, a glass stripping agent is provided, comprising the following components by weight:

[0043] Sodium fluorophosphate: 3 to 5 parts

[0044] Formamide: 3 to 5 parts

[0045] Boric acid: 3 to 5 parts

[0046] Glycerin: 3 to 5 parts

[0047] Water: 80 to 88 parts.

[0048] It is understood that this invention uses sodium fluorophosphate and formamide as dissolving components in the stripping agent under weakly acidic conditions, enabling the titanium dioxide coating layer on the glass surface to dissolve in the stripping agent at room temperature. Sodium fluorophosphate and formamide have a synergistic dissolving effect; when combined in a certain proportion, they can significantly accelerate the dissolution of the titanium dioxide coating layer.

[0049] In the glass stripping agent of this invention, boric acid is a monobasic weak acid that has no corrosive effect on lithium aluminum silicon glass. Adding glycerol to the boric acid solution causes an addition reaction between the boric acid and glycerol, forming a more stable complex and thus enhancing the acidity of the boric acid. Sodium fluorophosphate and formamide exhibit better stripping effects in a more acidic environment.

[0050] Test results show that the glass stripping agent of the present invention can remove the titanium dioxide coating layer on the surface of lithium aluminum silicon glass at room temperature (around 25°C), and it does not corrode the lithium aluminum silicon glass, nor does it cause the glass to turn blue or become cloudy.

[0051] In some embodiments of the present invention, the components are included by weight as follows:

[0052] Sodium fluorophosphate: 4 parts

[0053] Formamide: 4 parts

[0054] Boric acid: 4 parts

[0055] Glycerin: 4 parts

[0056] Water: 84 portions.

[0057] In some embodiments of the present invention, sodium fluorophosphate includes at least one of sodium monofluorophosphate and sodium hexafluorophosphate.

[0058] In other embodiments of the present invention, a method for preparing a glass stripping agent is provided, wherein sodium fluorophosphate, formamide, boric acid and glycerin are added to water under stirring conditions.

[0059] It is understood that the preparation method of the present invention does not require expensive equipment and complex process control, the reaction conditions are not harsh, the raw materials are readily available, the production cost is low, and it is easy to industrialize.

[0060] In other embodiments of the present invention, the application of a glass stripping agent in the stripping of titanium dioxide coatings on glass surfaces is provided.

[0061] It is understandable that the stripping agent, while removing titanium dioxide, does not corrode the lithium aluminum silicon glass. This preserves the glass's fundamental properties, ensuring that other properties remain unaffected and helping to maintain the glass's original transparency and optical performance.

[0062] Because this stripping agent has no adverse effects on glass, it will not cause the glass to turn blue or become cloudy during use. This is very important for applications that require a high level of glass surface finish, such as display technology or optical devices.

[0063] The stripping agent works at room temperature (around 25°C), which helps simplify the process and reduce energy consumption. Compared to some processes that require high-temperature treatment, it improves production efficiency and energy saving.

[0064] Depending on the formulation, the proportions of each component can be adjusted to meet different process and application requirements. This adjustability helps to adapt to different types of lithium aluminum silicon glass and titanium dioxide coatings.

[0065] In some other embodiments of the present invention, a method for removing titanium dioxide coating from a glass surface is provided, comprising the following steps: immersing the glass to be removed in a glass stripping agent.

[0066] The present invention provides a method for removing titanium dioxide coatings from glass surfaces that does not require expensive equipment or complex process control, has undemanding reaction conditions, and is easy to operate.

[0067] In some embodiments of the present invention, the soaking temperature is 20°C to 35°C.

[0068] In some embodiments of the present invention, the soaking time is 5 min to 10 min.

[0069] In some embodiments of the present invention, the glass to be stripped includes lithium aluminum silicon glass.

[0070] In some embodiments of the present invention, the steps of rinsing and drying the glass after the immersion treatment are also included.

[0071] The technical solution of the present invention will be better understood below with reference to specific embodiments.

[0072] It should be noted that all reagents used in the examples were obtained from commercially available sources.

[0073] Example 1

[0074] A glass stripping agent, by weight, comprises:

[0075] 4 parts of sodium monofluorophosphate

[0076] 4 parts of formamide

[0077] 4 parts boric acid

[0078] 4 parts glycerin

[0079] 84 portions of water.

[0080] The pH value of this plating stripper is 5.2.

[0081] The preparation method of the above glass stripping agent is as follows: first add water, then add sodium monofluorophosphate, formamide, boric acid and glycerin under stirring conditions, and stir evenly to obtain the glass stripping agent of this embodiment.

[0082] The results of the plating removal test are shown in Table 1.

[0083] Example 2

[0084] A glass stripping agent, by weight, comprises:

[0085] 3 parts sodium monofluorophosphate

[0086] 5 parts formamide

[0087] 4 parts boric acid

[0088] 4 parts glycerin

[0089] 84 portions of water.

[0090] The pH value of this plating stripper is 5.1.

[0091] The preparation method of the above glass stripping agent is as follows: first add water, then add sodium monofluorophosphate, formamide, boric acid and glycerin under stirring conditions, and stir evenly to obtain the glass stripping agent of this embodiment.

[0092] The results of the plating removal test are shown in Table 1.

[0093] Example 3

[0094] A glass stripping agent, by weight, comprises:

[0095] 5 parts of sodium monofluorophosphate

[0096] 3 parts formamide

[0097] 4 parts boric acid

[0098] 4 parts glycerin

[0099] 86 portions of water.

[0100] The pH value of this plating stripper is 5.3.

[0101] The preparation method of the above glass stripping agent is as follows: first add water, then add sodium monofluorophosphate, formamide, boric acid and glycerin under stirring conditions, and stir evenly to obtain the glass stripping agent of this embodiment.

[0102] The results of the plating removal test are shown in Table 1.

[0103] Comparative Example 1

[0104] A glass stripping agent, by weight, comprises:

[0105] 8 parts of formamide

[0106] 4 parts boric acid

[0107] 4 parts glycerin

[0108] 84 portions of water.

[0109] The pH value of this plating stripper is 5.0.

[0110] The preparation method of the above glass stripping agent is as follows: first add water, then add formamide, boric acid, glycerin and water under stirring conditions, and stir evenly to obtain the glass stripping agent of this comparative example.

[0111] The results of the comparative sample plating removal test are shown in Table 1.

[0112] Comparative Example 2

[0113] A glass stripping agent, by weight, comprises:

[0114] 8 parts of sodium monofluorophosphate

[0115] 4 parts boric acid

[0116] 4 parts glycerin

[0117] 84 portions of water.

[0118] The pH value of this plating stripper is 5.3.

[0119] The preparation method of the above glass stripping agent is as follows: first add water, then add sodium monofluorophosphate, boric acid, glycerin and water under stirring conditions, and stir evenly to obtain the glass stripping agent of this comparative example.

[0120] The results of the comparative sample plating removal test are shown in Table 1.

[0121] Comparative Example 3

[0122] A glass stripping agent, by weight, comprises:

[0123] 4 parts of sodium monofluorophosphate

[0124] 4 parts of formamide

[0125] 4 parts glycerin

[0126] 84 portions of water.

[0127] The pH value of this stripping agent is 7.0.

[0128] The preparation method of the above glass stripping agent is as follows: first add water, then add sodium monofluorophosphate, formamide, glycerin and water under stirring conditions, and stir evenly to obtain the glass stripping agent of this comparative example.

[0129] The results of the comparative sample plating removal test are shown in Table 1.

[0130] Comparative Example 4

[0131] A glass stripping agent, by weight, comprises:

[0132] 4 parts of sodium monofluorophosphate

[0133] 4 parts of formamide

[0134] 4 parts boric acid

[0135] 84 portions of water.

[0136] The pH value of this plating stripper is 6.1.

[0137] The preparation method of the above glass stripping agent is as follows: first add water, then add sodium monofluorophosphate, formamide, boric acid and water under stirring conditions, and stir evenly to obtain the glass stripping agent of this comparative example.

[0138] The results of the comparative sample plating removal test are shown in Table 1.

[0139] Plating stripping effect test:

[0140] Test method: Take one piece of lithium aluminum silicon glass with the same titanium dioxide coating on the surface and put it into a beaker containing 1000g of the stripping agent of Examples 1 to 3 and Comparative Examples 1 to 4 respectively, and immerse it at room temperature (25°C).

[0141] The dissolution time of the coating was observed and recorded every 2 minutes, and the total immersion time was no more than 60 minutes.

[0142] Next, remove the glass from which the surface coating has been completely dissolved, rinse it twice with pure water, dry it, and observe whether the glass turns blue or becomes cloudy.

[0143] Table 1 Comparison of Test Results

[0144] Examples and Comparative Examples Coating dissolution time / min Does the glass appear bluish or cloudy? Example 1 6 none Example 2 8 none Example 3 8 none Comparative Example 1 26 none Comparative Example 2 28 none Comparative Example 3 The coating does not dissolve / Comparative Example 4 16 none

[0145] As can be seen from Table 1, Examples 1, 2, and 3 can effectively dissolve the coating and the glass will not turn blue or become cloudy.

[0146] Comparing Example 1 with Comparative Examples 1 and 2, it can be found that sodium monofluorophosphate and formamide have a synergistic effect in dissolving the coating in the formulation, and the combination of the two in a certain proportion can significantly improve the stripping speed.

[0147] Comparing Example 1 and Comparative Example 3, the coating could only be dissolved under weakly acidic conditions. Under completely neutral conditions, sodium monofluorophosphate and formamide could not dissolve the coating either.

[0148] Comparing Example 1 and Comparative Example 4, glycerol can effectively accelerate the dissolution of the titanium dioxide coating on the surface of lithium aluminum silicon glass workpieces.

[0149] The glass stripping agent of this invention can completely remove the titanium dioxide coating layer on the surface of lithium aluminum silicon glass in a short time at room temperature, and has high practical application value.

[0150] The present invention has been described in detail above with reference to the embodiments. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A glass stripping agent, characterized by, by weight, comprising: fluorophosphonate sodium: 3 to 5 parts, formamide: 3 to 5 parts, boric acid: 3 to 5 parts, glycerol: 3 to 5 parts, water: 80 to 88 parts.

2. The glass striping agent of claim 1, wherein by weight, comprising: fluorophosphonate sodium: 4 parts, formamide: 4 parts, boric acid: 4 parts, glycerol: 4 parts, water: 84 parts.

3. The glass stripping agent according to claim 1 or 2, characterized by, The fluorophosphonate sodium comprises at least one of monofluorophosphonate sodium and hexafluorophosphonate sodium.

4. A method of making the glass striping agent of any one of claims 1 to 3, characterized in that, The fluorophosphonate sodium, the formamide, the boric acid and the glycerol are added into the water under stirring.

5. Use of the glass stripping agent according to any one of claims 1 to 3 in stripping a titanium dioxide coating layer on a glass surface.

6. A method for stripping a glass surface titanium dioxide coating, characterized by, comprising the steps of: immersing the glass to be stripped in the glass stripping agent according to any one of claims 1 to 3.

7. The method of claim 6, wherein, The temperature of the immersion treatment is 20 to 35 °C.

8. The method of claim 6, wherein, The time of the immersion treatment is 5 to 10 min.

9. The method of claim 6, wherein, The glass to be stripped comprises lithium-aluminum-silicon glass.

10. The method of claim 6, wherein, The process further comprises the steps of rinsing and drying the glass after the immersion treatment.