A method for reducing the alkali ion content on the inner surface of a glass storage bottle

Abstract

This invention discloses a method for reducing the alkali ion content on the inner surface of glass storage bottles, belonging to the field of glass material dealkali removal technology. Compared with other methods for reducing alkali metal ions on the inner surface of glass storage bottles, this invention uses ferrous sulfate at high temperature to remove alkali from the glass storage bottles. This invention does not involve nitrogen and will not cause environmental pollution. This invention does not directly use sulfur dioxide, resulting in less damage to equipment. Ferrous sulfate slowly decomposes to generate sulfide gas, which can uniformly reduce the alkali metal ion content on the inner surface of the glass storage bottle. After cleaning, the glass storage bottle is treated with ferrous sulfate at 540℃~580℃ for 10~40 minutes, and the alkali metal ion content on the inner surface of the glass storage bottle can decrease by up to 60% compared with that before dealkali removal. This allows the glass storage bottle to meet the strict requirements for controlling the precipitation of metal ions when storing special liquids.

Description

Technical Field

[0001] This invention relates to the field of alkali removal technology for glass materials, specifically to a method for reducing the alkali ion content on the inner surface of glass storage bottles. Background Technology

[0002] Glass possesses excellent thermal stability, chemical stability, optical properties, and mechanical properties, making it a superior packaging and storage material. However, with the increasing application of glass storage materials, the performance of glass storage bottles can no longer meet the stringent storage requirements of some high-end materials (such as photoresists) regarding gold impurity precipitation and particle size, necessitating the treatment of the inner surface of glass storage bottles.

[0003] To improve the water resistance of the inner surface of glass storage bottles and control the precipitation of alkali metal ions, it is necessary to reduce the alkali metal ion content on the inner surface of the glass storage bottles. Currently, the main methods for reducing the alkali metal ion content on the inner surface of glass storage bottles include acid treatment and treatment with difluoroethane (DFE). Commonly used substances for acid treatment are sulfur dioxide (SO2) and ammonium sulfate ((NH4)2SO4). The former easily causes SO2 emissions during production, increasing production costs and causing significant environmental pollution; the latter emits large amounts of nitrogen-containing gases during production, impacting the ecosystem. Summary of the Invention

[0004] The purpose of this invention is to provide a method for reducing the content of alkali metal ions on the inner surface of glass storage bottles, which can achieve the purpose of "de-alkali" without causing environmental pollution during production.

[0005] The only gaseous product of the decomposition of ferrous sulfate is sulfide gas; no gas is released after the reaction is complete. The DSC test results for ferrous sulfate heptahydrate are as follows: Figure 1 As shown. The reaction occurs as follows:

[0006] FeSO4·(H2O)7→FeSO4·(H2O)4+3H2O

[0007] FeSO4·(H2O)4→FeSO4·(H2O)+3H2O

[0008] FeSO4·(H2O)→FeSO4+H2O

[0009] FeSO4→0.5Fe2SO3+0.5SO2+0.5SO3

[0010] DSC results show that ferrous sulfate begins to slowly decompose at 540℃, releasing sulfide gases, and this temperature range coincides with the dealkali removal temperature range of sulfur dioxide. The slow decomposition of ferrous sulfate to generate sulfide gases can uniformly reduce the alkali metal ion content on the inner surface of glass storage bottles.

[0011] The objective of this invention can be achieved through the following technical solutions:

[0012] A method for reducing the alkali ion content on the inner surface of a glass storage bottle includes the following steps:

[0013] Step 1: Clean and dry the inner surface of the glass storage bottle;

[0014] Step 2: Add ferrous sulfate to a glass storage bottle, seal the bottle opening, and then dealkalize at high temperature;

[0015] Step 3: After cooling, the glass bottle is added to deionized water and ultrasonically treated to complete the dealkalization of the glass storage bottle.

[0016] As a further aspect of the present invention: the ferrous sulfate added in step two is ferrous sulfate heptahydrate.

[0017] As a further aspect of the present invention: the ferrous sulfate added in step two is placed in a quartz tube and does not directly contact the glass storage bottle.

[0018] As a further aspect of the present invention: the ferrous sulfate added in step two is 2% to 3% of the glass storage bottle capacity.

[0019] As a further aspect of the present invention, the high-temperature dealkali removal method is as follows: after sealing the mouth of the glass storage bottle, dealkali removal is carried out at a temperature of 540℃~580℃.

[0020] As a further aspect of the present invention, the dealkali removal time is 10 to 40 minutes.

[0021] As a further embodiment of the present invention, the glass bottle is made of the following raw materials in the indicated mass percentages: SiO2 60-70%, Al2O3 1-3%, B2O3 0.1-1%, Na2O 7-15%, K2O 0.1-1%, MgO 1-5%, CaO 7-15%, BaO 0.1%-1%, Fe2O3 0.1-1%.

[0022] The beneficial effects of this invention are:

[0023] 1. This invention uses ferrous sulfate to reduce the content of alkali metal ions on the inner surface of glass storage bottles. It does not directly use sulfur dioxide and nitrogen-containing substances in the production process, thus having a small impact on the ecological environment.

[0024] 2. This invention uses ferrous sulfate for dealkalization, which greatly reduces the percentage of alkali metal ions on the inner surface of the glass bottle after dealkalization, thus meeting the strict requirements for controlling the precipitation of metal ions in glass storage bottles.

[0025] 3. The present invention uses ferrous sulfate for dealkalization, which can uniformly reduce the content of alkali metal ions on the inner surface of the glass storage bottle. Attached Figure Description

[0026] The invention will now be further described with reference to the accompanying drawings.

[0027] Figure 1 This is a DSC test result for ferrous sulfate heptahydrate. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1 As shown, the specifications of the glass storage bottle used in this invention are as follows: the glass bottle has a capacity of 4L, a bottle mouth diameter of 35mm, and a height of 340mm. Its composition by mass percentage is as follows: SiO2 67%, Al2O3 2%, B2O3 0.5%, Na2O 10%, K2O 1%, MgO 2.5%, CaO 10%, BaO 1%, Fe2O3 1%.

[0030] In Embodiment 1 of the present invention, no processing is performed.

[0031] Examples 2-5 of the present invention were prepared by the following method:

[0032] Weigh 2%–4% of the glass bottle's volume of ferrous sulfate heptahydrate using an electronic balance and place it into a quartz tube with a side opening. Insert the quartz tube into the glass storage bottle and suspend it in the middle of the glass storage bottle. Place the sealed glass bottle into a muffle furnace at a temperature of T0 (540℃≤T0≤580℃) for 10, 20, 30, and 40 minutes, respectively.

[0033] After the glass storage bottle has cooled to room temperature, it is ultrasonically cleaned with deionized water for 30 minutes to remove the solid products scattered at the bottom of the bottle and the alkali metal ion compounds such as sodium sulfate precipitated during the dealkalization process. After drying, the performance is tested.

[0034] X-ray energy dispersive spectroscopy (EDS) was performed on the shoulder, body, and bottom of the treated glass storage bottle. The results of the alkali metal ion content (taking Na2O content as an example) on the inner surface are shown in Table 1.

[0035] Table 1. Na2O content on the inner surface of different parts after different treatment times.

[0036]

[0037] Table 1 shows that the alkali metal ion content on the inner surface of the treated glass storage bottles decreased significantly. The decrease in alkali metal ion content gradually increased with increasing treatment time, reaching a significant level at 30 minutes. Further extending the treatment time reduced the decrease in alkali metal ion content. EDS testing indicated that the optimal treatment time for reducing the alkali metal ion content on the inner surface of glass storage bottles using ferrous sulfate was 30 minutes.

[0038] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A method for reducing the alkali ion content on the inner surface of a glass storage bottle, characterized in that, Includes the following steps: Step 1: Clean and dry the inner surface of the glass storage bottle; Step 2: Add ferrous sulfate to a glass storage bottle, seal the bottle opening, and then dealkalize at high temperature; Step 3: After cooling, the glass bottle is added to deionized water and ultrasonically treated to complete the dealkalization of the glass storage bottle.

2. The method for reducing the alkali ion content on the inner surface of a glass storage bottle according to claim 1, characterized in that, The ferrous sulfate added in step two is ferrous sulfate heptahydrate.

3. The method for reducing the alkali ion content on the inner surface of a glass storage bottle according to claim 1, characterized in that, The ferrous sulfate added in step two is placed in a quartz tube and does not come into direct contact with the glass storage bottle.

4. The method for reducing the alkali ion content on the inner surface of a glass storage bottle according to claim 1, characterized in that, In step two, the amount of ferrous sulfate added is 2%-3% of the glass storage bottle's capacity.

5. A method for reducing the alkali ion content on the inner surface of a glass storage bottle according to claim 4, characterized in that, The high-temperature dealkali removal method is as follows: after sealing the mouth of the glass storage bottle, dealkali removal is carried out at a temperature of 540℃-580℃.

6. The method for reducing the alkali ion content on the inner surface of a glass storage bottle according to claim 5, characterized in that, The dealkali removal time is 10-40 minutes.

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