A method for coating the inner surface of a glass bottle

Abstract

The application relates to a glass bottle inner surface film coating method, characterized in that: (1) the glass bottle is cleaned and dried; (2) a silicon dioxide film is coated on the inner surface of the glass bottle by using a spraying method, and after being taken out, low-temperature drying is carried out; a copper oxide film is coated on the silicon dioxide film by using the spraying method, and after being taken out, low-temperature drying is carried out; a silicon dioxide film is coated on the copper oxide film by using the spraying method, and after being taken out, low-temperature drying is carried out; (3) laser solidification equipment is used for laser solidification, and after solidification is completed, cleaning is carried out, so that the glass bottle with the inner surface film coating is prepared. The application has the advantages that the copper oxide film layer is introduced into the composite structure film layer, the absorption efficiency of laser energy is improved, the laser solidification has the advantages of high efficiency, high energy utilization efficiency and direct heating of the film layer through the glass compared with the conventional high-temperature heating form, the temperature difference of the glass bottle before and after solidification is reduced, the glass bottle explosion is prevented, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of glass bottle coating technology, and specifically to a method for coating the inner surface of a glass bottle. Background Technology

[0002] Glass bottles are traditional packaging containers used for packaging beverages, alcoholic beverages, chemicals, pharmaceuticals, and more. They are chemically stable, possess excellent barrier and sealing properties, and effectively protect the contents from external environmental influences. Coating glass bottles involves applying a thin film of metal or other compounds to the glass surface to alter the bottle's optical, thermal, and electromagnetic properties to meet specific usage requirements.

[0003] Reagents used in the microelectronics industry have extremely high requirements for the leaching of metal ions and other impurities from packaging materials. Glass, with its excellent optical, mechanical, thermal, and chemical stability, is a superior material for storing and packaging these reagents. Microelectronics reagents readily react with alkali metals; therefore, their storage conditions place high demands on the leaching of metal ions from glass storage bottles. Surface treatment of glass bottles, such as coating the inner surface with a functional film, can enable the glass bottles to meet the performance requirements of the application environment and satisfy the storage conditions of the reagents. However, the large size, heavy weight, and special shapes of glass storage bottles (especially some irregularly shaped parts at the bottle neck) make coating difficult. Currently, industrial-scale coating of glass bottles uses spraying and immersion methods, but conventional curing processes have drawbacks such as low energy efficiency and low processing efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of low energy utilization efficiency and low processing efficiency in the existing glass coating process, and to provide a method for coating the inner surface of glass bottles.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for coating the inner surface of a glass bottle, characterized by comprising the following steps: (1) Clean and dry the glass bottle to make the inner surface of the glass bottle suitable for coating; (2) A silica film is coated on the inner surface of the glass bottle by spraying. After removal, it is dried at low temperature. A copper oxide film is coated on the silica film by spraying. After removal, it is dried at low temperature. Then, a silica film is coated on the copper oxide film by spraying. After removal, it is dried at low temperature. (3) The glass bottle with the inner surface coated with a multi-layer film structure is laser-cured using a laser curing device. After curing, it is cleaned to obtain the glass bottle with the inner surface coating.

[0006] Furthermore, the cleaning and drying process in step (1) is as follows: the glass bottle is ultrasonically cleaned in pure water, alkaline cleaning agent, acidic cleaning agent and pure water for 20~60 minutes respectively, and then placed in an oven at 75~85℃ to dry.

[0007] Furthermore, the alkaline cleaning agent comprises 1-3% potassium hydroxide, 1-10% ethylenediaminetetraacetic acid, 1-5% gluconic acid, 2-5% isopropanol, 75-90% deionized water, and 2-10% surfactant, wherein the surfactant is one of sodium α-alkenyl sulfonate, sodium dodecylbenzene sulfonate, stearic acid, etc.

[0008] Furthermore, the acidic cleaning agent comprises 5-15% citric acid, 10-25% acetic acid, 75-85% deionized water, and 2-10% nonionic surfactant, wherein the nonionic surfactant is one of alkyl glycosides, fatty acid glycerides, polyethylene glycol octylphenyl ether, etc.

[0009] Furthermore, the process of coating a thin film on the inner surface of the glass bottle by spraying in step (2) is as follows: the glass bottle is placed with the bottle mouth facing down, the silica coating liquid and copper oxide particle dispersion are atomized to obtain an atomized liquid, and then the atomized liquid is sprayed onto the inner surface of the glass bottle using a pressure nozzle device so that the inner surface is uniformly coated with a thin film.

[0010] Furthermore, the silica coating solution is composed of the following raw materials in mass percentage: 2-10% silica sol, 10-20% deionized water, and 75-85% alcohols, wherein the alcohols are one or a mixture of two or more of ethanol, ethylene glycol, and n-propanol.

[0011] Furthermore, the copper oxide particle dispersion is composed of the following raw materials in mass percentage: 5-10% nano-copper oxide particles, 20-30% stearic acid, 10-20% polyvinyl alcohol, 5-10% dimethylformamide, and 30-50% ethylene glycol.

[0012] Furthermore, the specific process of the spraying method in step (2) is as follows: the coating liquid is atomized at 0.2~0.8 MPa, and the pressure nozzle is a 360° omnidirectional rotating nozzle.

[0013] Furthermore, the conditions for laser curing in step (3) are: laser wavelength 1060nm and laser power 2W~8W.

[0014] The present invention has the following advantages: By introducing a copper oxide film layer into the composite structure film layer, the present invention improves the absorption efficiency of laser energy. Compared with conventional high-temperature heating, laser curing has the advantages of high efficiency, high energy utilization efficiency, and direct heating of the film layer through glass, reducing the temperature difference between the glass bottle before and after curing, preventing the glass bottle from cracking, and improving production efficiency. Attached Figure Description

[0015] Figure 1 The figures show the test results of gold impurity precipitation in Examples 1-4. Detailed Implementation

[0016] A method for coating the inner surface of a glass bottle, the specific implementation steps of which are as follows: The alkaline cleaning agents used in the following embodiments are composed of the following raw materials by weight percentage: potassium hydroxide 2%, ethylenediaminetetraacetic acid 5%, gluconic acid 3%, isopropanol 4%, deionized water 82%, sodium α-alkenyl sulfonate 4%; the acidic cleaning agents are composed of the following raw materials by weight percentage: citric acid 6%, acetic acid 16%, deionized water 76%, alkyl glycoside 2%. Example

[0017] (1) After ultrasonicating the glass bottle in pure water, alkaline cleaning agent, acidic cleaning agent and pure water for 20 minutes respectively, put it in an 80℃ oven to dry. (2) Spray the dried glass bottle with 0.2 MPa atomized acidic silica coating solution (composed of the following raw materials by mass percentage: silica sol 8%, deionized water 12%, ethanol 80%), and then place the bottle mouth down in an 80°C oven to dry. (3) Spray the dried glass bottle with a 0.2 MPa atomized copper oxide particle dispersion (composed of the following raw materials by mass percentage: 8% nano copper oxide particles, 22% stearic acid, 15% polyvinyl alcohol, 8% dimethylformamide, and 47% ethylene glycol), and then place the bottle mouth down in an 80°C oven to dry. (4) Spray the dried glass bottle with 0.2 MPa atomized acidic silica coating solution (composed of the following raw materials by mass percentage: silica sol 8%, deionized water 12%, ethanol 80%), and then place the bottle mouth down in an 80°C oven to dry. (5) Move the glass bottle into the infrared laser curing equipment, adjust the laser power to 2W and the laser wavelength to 1060nm to complete the curing of the composite film structure. Example

[0018] (1) After ultrasonically cleaning the glass bottle in pure water, alkaline cleaning agent, acidic cleaning agent and pure water for 40 minutes respectively, put it in an 80℃ oven to dry. (2) Spray the dried glass bottle with 0.5 MPa atomized acidic silica coating solution (composed of the following raw materials by mass percentage: silica sol 3%, deionized water 17%, ethylene glycol 80%), and then place the bottle mouth down in an 80°C oven to dry. (3) Spray the dried glass bottle with a 0.5 MPa atomized copper oxide particle dispersion (composed of the following raw materials by mass percentage: 6% nano copper oxide particles, 24% stearic acid, 12% polyvinyl alcohol, 8% dimethylformamide, and 50% ethylene glycol), and then place the bottle mouth down in an 80°C oven to dry. (4) Spray the dried glass bottle with 0.5 MPa atomized acidic silica coating solution (composed of the following raw materials by mass percentage: silica sol 3%, deionized water 17%, ethylene glycol 80%), and then place the bottle mouth down in an 80°C oven to dry. (5) Move the glass bottle into the infrared laser curing equipment, adjust the laser power to 5W and the laser wavelength to 1060nm to complete the curing of the composite film structure. Example

[0019] (1) After ultrasonically cleaning the glass bottle in pure water, alkaline cleaning agent, acidic cleaning agent and pure water for 60 minutes respectively, put it in an 80℃ oven to dry. (2) Spray the dried glass bottle with 0.8 MPa atomized acidic silica coating solution (composed of the following raw materials by mass percentage: silica sol 5%, deionized water 18%, ethanol 77%), and then place the bottle mouth down in an 80°C oven to dry. (3) Spray the dried glass bottle with a 0.8 MPa atomized copper oxide particle dispersion (composed of the following raw materials by mass percentage: 10% nano copper oxide particles, 28% stearic acid, 18% polyvinyl alcohol, 9% dimethylformamide, and 35% ethylene glycol), and then place the bottle mouth down in an 80°C oven to dry. (4) Spray the dried glass bottle with 0.8 MPa atomized acidic silica coating solution (composed of the following raw materials by mass percentage: silica sol 5%, deionized water 18%, n-propanol 77%), and then place the bottle mouth down in an 80°C oven to dry. (5) Move the glass bottle into the infrared laser curing equipment, adjust the laser power to 8W and the laser wavelength to 1060nm to complete the curing of the composite film structure. Example

[0020] (1) After ultrasonicating the glass bottle in pure water, alkaline cleaning agent, acidic cleaning agent and pure water for 30 minutes respectively, put it in an 80℃ oven to dry. (2) Spray the dried glass bottle with 0.6 MPa atomized acidic silica coating solution (composed of the following raw materials by mass percentage: silica sol 7%, deionized water 17%, ethanol 36%, ethylene glycol 40%), and then place the bottle mouth down in an 80°C oven to dry. (3) Spray the dried glass bottle with a 0.6 MPa atomized copper oxide particle dispersion (composed of the following raw materials by mass percentage: 7% nano copper oxide particles, 21% stearic acid, 17% polyvinyl alcohol, 7% dimethylformamide, and 48% ethylene glycol), and then place the bottle mouth down in an 80°C oven to dry. (4) Spray the dried glass bottle with 0.6 MPa atomized acidic silica coating solution (composed of the following raw materials by mass percentage: silica sol 7%, deionized water 17%, ethanol 36%, ethylene glycol 40%), and then place the bottle mouth down in an 80°C oven to dry. (5) Move the glass bottle into the infrared laser curing equipment, adjust the laser power to 4W and the laser wavelength to 1060nm to complete the curing of the composite film structure.

[0021] Following the methods in Examples 1-4, glass bottles with composite film layers on the inner surface were obtained, and their performance was tested. The results of the gold impurity precipitation test are shown in [Figure 1]. Figure 1 : From the gold impurity precipitation tests in Examples 1-4, it can be seen that the precipitation of B, Na, K, Ca, and Mg elements is all less than 0.1 ppb, meeting the relevant requirements for storage bottles of reagents in the microelectronics industry (metal ion precipitation less than 0.1 ppb). Among them, the most critical alkali metal element Na precipitates very little, close to 0, making it suitable for storage bottles of reagents in the microelectronics industry. Therefore, it can be concluded that the spray coating method, with atomization at 0.2~0.8 MPa and curing conditions of a laser wavelength of 1060 nm and a laser power of 2W~8W, can achieve good film quality and reduce gold impurity precipitation.

[0022] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications 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 protection scope of the present invention.

Claims

1. A method for coating the inner surface of a glass bottle, characterized in that... Includes the following steps: (1) Clean and dry the glass bottles; (2) A silica film is coated on the inner surface of the glass bottle by spraying. After removal, it is dried at low temperature. A copper oxide film is coated on the silica film by spraying. After removal, it is dried at low temperature. Then, a silica film is coated on the copper oxide film by spraying. After removal, it is dried at low temperature. The process of coating the inner surface of the glass bottle by spraying is as follows: the glass bottle is placed with the mouth facing down. The silica coating liquid and the copper oxide particle dispersion are atomized to obtain an atomized liquid. Then, the atomized liquid is sprayed onto the inner surface of the glass bottle using a pressure nozzle device so that the inner surface is uniformly coated with a film. (3) The glass bottle with the inner surface coated with a multi-layer film structure is laser-cured using a laser curing device. After curing, it is cleaned to obtain the glass bottle with the inner surface coating.

2. The method for coating the inner surface of a glass bottle according to claim 1, characterized in that: The cleaning and drying process in step (1) is as follows: the glass bottle is ultrasonically cleaned in pure water, alkaline cleaning agent, acidic cleaning agent and pure water for 20-60 minutes respectively, and then placed in an oven at 75-85℃ to dry.

3. The method for coating the inner surface of a glass bottle according to claim 2, characterized in that: The alkaline cleaning agent is composed of the following raw materials in weight percentage: 1-3% potassium hydroxide, 1-10% ethylenediaminetetraacetic acid, 1-5% gluconic acid, 2-5% isopropanol, 75-90% deionized water, and 2-10% surfactant, wherein the surfactant is one of sodium α-alkenyl sulfonate, sodium dodecylbenzene sulfonate, and stearic acid.

4. The method for coating the inner surface of a glass bottle according to claim 2, characterized in that: The acidic cleaning agent is composed of the following raw materials by weight percentage: 5-15% citric acid, 10-25% acetic acid, 75-85% deionized water, and 2-10% nonionic surfactant, and the sum of all components is 100%; wherein the nonionic surfactant is one of alkyl glycoside, fatty acid glyceride, and polyethylene glycol octylphenyl ether.

5. The method for coating the inner surface of a glass bottle according to claim 1, characterized in that: The silica coating solution consists of the following raw materials in the indicated mass percentages. Composition: 2-10% silica sol, 10-20% deionized water, 75-85% alcohols, wherein the alcohols are one or a mixture of two or more of ethanol, ethylene glycol, and n-propanol.

6. The method for coating the inner surface of a glass bottle according to claim 1, characterized in that: The copper oxide particle dispersion is composed of the following raw materials in the following mass percentages: 5-10% nano copper oxide particles, 20-30% stearic acid, 10-20% polyvinyl alcohol, 5-10% dimethylformamide, and 30-50% ethylene glycol.

7. The method for coating the inner surface of a glass bottle according to claim 1, characterized in that: The specific process of the spraying method in step (2) is as follows: the coating liquid is atomized at 0.2~0.8 MPa, and the pressure nozzle is a 360° omnidirectional rotating nozzle.

8. A method for coating the inner surface of a glass bottle according to any one of claims 1-7, characterized in that: The conditions for laser curing in step (3) are: laser wavelength 1060nm and laser power 2W~8W.

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