Ultra-small particle size nano bubble water and preparation method thereof

Abstract

The present invention discloses ultra-small particle size nanobubble water and its preparation method, belonging to the field of bubble water preparation technology. The method first purifies tap water through steps such as sand filtration, activated carbon filtration, and reverse osmosis, and then further fine filtration is performed using a nano-scale filter membrane to obtain pure water. After cooling, the water is placed in a pressurizing device, and high-pressure nitrogen is introduced and the pressure is released to form ultra-small particle size nanobubble water. Compared with the existing technology, the nanobubble water prepared by the present invention not only has a high bubble concentration but also exhibits excellent antioxidant capacity, which can be used to improve the quality of drinking water and enhance its health benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of bubble water preparation, and in particular to ultra-small particle size nano bubble water and a preparation method thereof. Background Art

[0002] With the development of society and the rise of people's health awareness, the demand for drinking water quality is becoming increasingly stringent. Sparkling water, as a new beverage, has gained popularity among consumers due to its potential health benefits, such as improved digestion, enhanced immunity, and antioxidant properties. However, existing sparkling water production technologies have several shortcomings, limiting the improvement of its quality and functionality.

[0003] Ultra-small nanobubbles are bubbles with a diameter less than 100 nanometers, typically ranging from 1 to 100 nanometers. These ultra-small nanobubbles possess unique physical and chemical properties, such as high specific surface area, surface energy, and excellent dispersibility and stability.

[0004] First, existing technologies for producing sparkling water often face the problem of uneven bubble size distribution, which affects the uniformity and taste of the sparkling water. Furthermore, poor bubble stability poses a challenge, as bubbles easily burst, making the storage and transportation of the sparkling water difficult. Second, existing sparkling water production processes fail to thoroughly remove impurities from the water, which not only affects the taste and appearance of the sparkling water but also potentially reduces its health benefits. Failure to effectively remove impurities such as dissolved solids, microorganisms, and other organic matter in the water can pose potential risks to consumer health. Furthermore, bubble formation and stability are affected by multiple factors, including the liquid's surface tension, viscosity, gas pressure, and temperature. Existing technologies have limitations in controlling these parameters to achieve ideal bubble size and stability, resulting in varying performance across sparkling water products. Finally, existing sparkling water production technologies also leave room for improvement in terms of environmental friendliness. Some traditional methods can consume high amounts of energy and generate significant amounts of waste, placing a burden on the environment.

[0005] Chinese patent publication number CN115893735A discloses a process for preparing micro-nano small molecule bubble water, which aims to solve the problems of uneven distribution and insufficient stability of micro-nano bubbles in the preparation process of bubble water. These problems may affect the overall quality of the bubble water and hinder the stable existence of bubbles in the water. The process includes the following steps: first, preparing pure water, then blending the pure water, then preparing pure air, then mixing the pure water and air, and finally treating the pure water with ultrasonic cavitation technology. Through the action of the ultrasonic generator and transducer, the bubbles in the pure water are quickly disintegrated, thereby generating micro-nano small molecule bubbles. Despite this, the micro-nano small molecule bubble water prepared by this patent still has room for improvement in terms of bubble concentration and antioxidant effect. In summary, the existing bubble water preparation technology has deficiencies in bubble size uniformity, stability, impurity removal efficiency and environmental impact. A new technology is urgently needed to overcome these challenges to meet the market demand for high-quality bubble water. Summary of the Invention

[0006] In order to address the deficiencies in the prior art, the present invention aims to provide an ultra-small particle size nano bubble water and a preparation method thereof.

[0007] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0008] A method for preparing ultra-small particle size nano bubble water is as follows:

[0009] Step 1: The raw water pump draws tap water, filters it through sand and activated carbon, and then processes it through a reverse osmosis membrane and nano-scale precision filter to obtain filtered water;

[0010] Step 2: Cool the filtered water and place it in a pressurizing device, introduce high-pressure nitrogen and then release the pressure to produce ultra-small particle size nanobubble water.

[0011] Preferably, the preparation method of the ultra-small particle size nano bubble water is as follows:

[0012] Step 1: Use a raw water pump to extract tap water and transport it to a sand filter. The tap water first passes through the sand filter and is retained by the sand layer. The water after the sand filter then flows into the activated carbon filter. The pressurized water is retained by the reverse osmosis membrane to produce pure water. The pure water then flows into the precision filter. The filter membrane of the precision filter is a nano-scale filter membrane to obtain filtered water.

[0013] Step 2: Cool the filtered water, place the cooled water into a pressurizing device, introduce high-pressure nitrogen into the pressurizing device, maintain the pressure and then release it to normal pressure. During the entire preparation process, maintain the water temperature to obtain ultra-small particle size nanobubble water.

[0014] The filtered water is cooled to 0-5°C.

[0015] The pressure of the high-pressure nitrogen introduced in step 2 is controlled at 0.5-2 MPa.

[0016] The pressure maintenance time of the high-pressure nitrogen in step 2 is controlled to be 30 to 60 minutes.

[0017] In step 2, the water temperature is maintained at 0-5°C throughout the preparation process.

[0018] The preparation method of the nano-scale filtration membrane is as follows:

[0019] Polyethersulfone, dimethylformamide and a functional agent are mixed to form a mixed liquid; the mixed liquid is spread on a substrate to form a film, the film is treated with airflow, and the treated film is solidified in water. After the solidification is completed, the film is taken out and air-dried to form a nano-scale filtration membrane.

[0020] The functional agent consists of a fluorine-containing compound, a silicon-containing compound and polyethylene glycol.

[0021] Preferably, the preparation method of the nano-scale filtration membrane is as follows, in parts by weight:

[0022] 10-30 parts of polyethersulfone, 120-160 parts of dimethylformamide, and 20-40 parts of a functional agent are mixed evenly to obtain a mixed solution, and the mixed solution is evenly spread on a substrate to form a thin film with a thickness of 0.5-3 μm. In an environment with a temperature of 30-50°C, an airflow with an absolute humidity of 20-40 gH2O / kg is blown onto the surface of the film for treatment. The relative speed between the airflow and the film is 1-3 m / min, and the duration is 20-60 seconds. The treated film is immersed in water with a temperature of 1-6°C for curing for 20-60 seconds. After the curing is completed, the film is taken out of the water and air-dried to form a nano-scale filtration membrane.

[0023] The functional agent is composed of a fluorine-containing compound, a silicon-containing compound and polyethylene glycol in a mass ratio of 0.5-2:1-2:2-4.

[0024] The fluorine-containing compound is at least one of perfluoro-N, N-bis(perfluoroethyl)propylamine, 1-fluoroamine, perfluorotributylamine, and perfluoro-N-methylpiperidine.

[0025] The silicon-containing compound is at least one of trimethoxy-7-oxabicyclo[4.1.0]hept-3-ylsilane, [8-(epoxypropyloxy)-n-octyl]trimethoxysilane, and (tetrahydrofurfuryloxypropyl)triethoxysilane.

[0026] Ultra-small particle size nano bubble water is prepared by adopting the above-mentioned preparation method of ultra-small particle size nano bubble water.

[0027] In the present invention, the functions of each substance are as follows:

[0028] As one of the main components of nano-scale filtration membranes, polyethersulfone provides mechanical strength and chemical stability and is a key polymer in the formation of filtration membranes.

[0029] Dimethylformamide is used as a solvent. Dimethylformamide helps to dissolve polyethersulfone and other additives to form a uniform casting solution, which is convenient for subsequent film formation and processing.

[0030] The functional agent is composed of fluorine-containing compounds, silicon-containing compounds and polyethylene glycol. These substances improve the performance of the membrane during the preparation process and enhance the filtering effect of the membrane on molecules that may increase the viscosity of water.

[0031] High-pressure nitrogen is used in the pressurization step during the preparation of ultra-small particle size nanobubble water to help form nanobubbles.

[0032] Tap water is used as raw water, which goes through a series of filtration and treatment steps and is finally converted into ultra-small particle size nanobubble water.

[0033] These substances work together to form a nano-scale filtration membrane with excellent performance and a high-quality ultra-small particle size nano bubble water.

[0034] Compared with the existing technology, it has the following beneficial effects:

[0035] 1) The ultra-small nanobubble water of this invention exhibits a high bubble concentration and enhanced antioxidant properties. This is primarily due to the use of a nanoscale filtration membrane, which effectively filters out molecules that increase water viscosity and surface tension, thereby promoting the formation and stability of nanobubbles. Furthermore, the presence of ultra-small nanobubbles imparts a certain antioxidant capacity to the water, helping to protect substrates from oxidative damage caused by reactive oxygen species.

[0036] 2) Because the ultra-small nanobubble water of this invention has a high bubble concentration, these bubbles provide more active oxygen in the water, thereby enhancing the physiological functions and health benefits of the water. This water is not only suitable for improving the quality of drinking water, improving its taste and biocompatibility, but also has the potential to have positive effects on human health, such as improving digestion and enhancing immunity.

[0037] 3) This invention provides an innovative technology for producing ultra-small nanobubble water. Through a precisely controlled water treatment and pressurization process, including sand filtration, activated carbon filtration, reverse osmosis, and nano-scale precision filtration, followed by cooling and high-pressure nitrogen pressurization, it produces ultra-small nanobubbles with high concentration and stability. This method not only improves production efficiency but also ensures product quality, making it a safer, healthier, and more efficient choice for drinking purified water. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a photo of the actual object after the test of the inhibitory effect on copper sheet oxidation in Test Example 2. DETAILED DESCRIPTION

[0039] Main sources of substances:

[0040] Polyethersulfone, brand: E2010, manufacturer (origin): BASF, Germany.

[0041] Polyethylene glycol, product number: PEG400, brand: Lotte, South Korea.

[0042] The remaining raw materials in the examples and comparative examples of the present invention are all commercially available products.

[0043] The gas flow referred to in the embodiment can be air, oxygen, or nitrogen.

[0044] The design concept of this invention is to develop an innovative ultra-small nanobubble water production technology. This technology aims to produce ultra-small nanobubbles with high concentration and stability through a precisely controlled water treatment and pressurization process, including sand filtration, activated carbon filtration, reverse osmosis, and nano-scale precision filtration, followed by cooling and high-pressure nitrogen pressurization. This nanobubble water not only improves the quality of drinking water, enhancing its taste and biocompatibility, but also exhibits significant antioxidant effects, helping to enhance the physiological functions and health benefits of water, thereby providing consumers with a safer, healthier, and more efficient drinking water option.

[0045] Example 1

[0046] A method for preparing ultra-small particle size nano bubble water is as follows:

[0047] Step 1: Use a raw water pump to extract tap water and transport it to a sand filter. The tap water first passes through the sand filter. When the water passes through the sand layer, large particles of suspended matter and impurities are intercepted by the sand and gravel. The water that has passed the sand filter then flows into the activated carbon filter. The activated carbon absorbs impurities in the water. The pressurized water then passes through the reverse osmosis membrane. Dissolved solids and microorganisms are intercepted to produce pure water. The purified water then flows into the precision filter to further remove finer particles and microorganisms. The filter membrane of the precision filter is a nano-scale filter membrane to obtain filtered water.

[0048] Step 2: Cool the filtered water to 1°C, place the cooled water into a pressurizing device, introduce high-pressure nitrogen into the pressurizing device, control the pressure at 0.8 MPa, maintain the time at 40 minutes, and then release the pressure to normal pressure. During the entire preparation process, maintain the water temperature at 1°C to obtain ultra-small particle size nanobubble water.

[0049] The preparation method of the nano-scale filtration membrane is as follows:

[0050] 20 g of polyethersulfone, 140 g of dimethylformamide, and 30 g of a functional agent are mixed uniformly to obtain a mixed liquid; the mixed liquid is evenly spread on a substrate to form a thin film with a thickness of 1.5 μm; an airflow with an absolute humidity of 30 g H2O / kg is blown onto the surface of the film at a temperature of 40°C for treatment; the relative speed between the airflow and the film is 2 m / min, and the duration is 40 seconds; the treated film is immersed in water at a temperature of 5°C for curing for 40 seconds; after the curing is completed, the film is removed from the water and air-dried to form a nano-scale filtration membrane.

[0051] The functional agent is composed of perfluorotributylamine, (tetrahydrofurfuryloxypropyl)triethoxysilane and polyethylene glycol in a mass ratio of 1:1.5:3.

[0052] Example 2

[0053] The preparation method of ultra-small particle size nano bubble water is basically the same as that of Example 1, the only difference being the preparation method of the nanoscale filtration membrane.

[0054] The preparation method of the nano-scale filtration membrane is as follows:

[0055] 20 g of polyethersulfone, 140 g of dimethylformamide, and 30 g of a functional agent are mixed uniformly to obtain a mixed liquid; the mixed liquid is evenly spread on a substrate to form a thin film with a thickness of 1.5 μm; an airflow with an absolute humidity of 30 g H2O / kg is blown onto the surface of the film at a temperature of 40°C for treatment; the relative speed between the airflow and the film is 2 m / min, and the duration is 40 seconds; the treated film is immersed in water at a temperature of 5°C for curing for 40 seconds; after the curing is completed, the film is removed from the water and air-dried to form a nano-scale filtration membrane.

[0056] The functional agent is composed of 1-fluoroamine, (tetrahydrofurfuryloxypropyl)triethoxysilane and polyethylene glycol in a mass ratio of 1:1.5:3.

[0057] Example 3

[0058] The preparation method of ultra-small particle size nano bubble water is basically the same as that of Example 1, the only difference being the preparation method of the nanoscale filtration membrane.

[0059] The preparation method of the nano-scale filtration membrane is as follows:

[0060] 20 g of polyethersulfone, 140 g of dimethylformamide, and 30 g of a functional agent are mixed uniformly to obtain a mixed liquid; the mixed liquid is evenly spread on a substrate to form a thin film with a thickness of 1.5 μm; an airflow with an absolute humidity of 30 g H2O / kg is blown onto the surface of the film at a temperature of 40°C for treatment; the relative speed between the airflow and the film is 2 m / min, and the duration is 40 seconds; the treated film is immersed in water at a temperature of 5°C for curing for 40 seconds; after the curing is completed, the film is removed from the water and air-dried to form a nano-scale filtration membrane.

[0061] The functional agent is composed of perfluoro-N, N-bis(perfluoroethyl)propylamine, (tetrahydrofurfuryloxypropyl)triethoxysilane and polyethylene glycol in a mass ratio of 1:1.5:3.

[0062] Example 4

[0063] The preparation method of ultra-small particle size nano bubble water is basically the same as that of Example 1, the only difference being the preparation method of the nanoscale filtration membrane.

[0064] The preparation method of the nano-scale filtration membrane is as follows:

[0065] 20 g of polyethersulfone, 140 g of dimethylformamide, and 30 g of a functional agent are mixed uniformly to obtain a mixed liquid; the mixed liquid is evenly spread on a substrate to form a thin film with a thickness of 1.5 μm; an airflow with an absolute humidity of 30 g H2O / kg is blown onto the surface of the film at a temperature of 40°C for treatment; the relative speed between the airflow and the film is 2 m / min, and the duration is 40 seconds; the treated film is immersed in water at a temperature of 5°C for curing for 40 seconds; after the curing is completed, the film is removed from the water and air-dried to form a nano-scale filtration membrane.

[0066] The functional agent is composed of perfluorotributylamine, [8-(epoxypropyloxy)-n-octyl]trimethoxysilane and polyethylene glycol in a mass ratio of 1:1.5:3.

[0067] Example 5

[0068] The preparation method of ultra-small particle size nano bubble water is basically the same as that of Example 1, the only difference being the preparation method of the nanoscale filtration membrane.

[0069] The preparation method of the nano-scale filtration membrane is as follows:

[0070] 20 g of polyethersulfone, 140 g of dimethylformamide, and 30 g of a functional agent are mixed uniformly to obtain a mixed liquid; the mixed liquid is evenly spread on a substrate to form a thin film with a thickness of 1.5 μm; an airflow with an absolute humidity of 30 g H2O / kg is blown onto the surface of the film at a temperature of 40°C for treatment; the relative speed between the airflow and the film is 2 m / min, and the duration is 40 seconds; the treated film is immersed in water at a temperature of 5°C for curing for 40 seconds; after the curing is completed, the film is removed from the water and air-dried to form a nano-scale filtration membrane.

[0071] The functional agent is composed of perfluorotributylamine, trimethoxy-7-oxabicyclo[4.1.0]hept-3-ylsilane and polyethylene glycol in a mass ratio of 1:1.5:3.

[0072] Example 6

[0073] The preparation method of ultra-small particle size nano bubble water is basically the same as that of Example 1, the only difference being the preparation method of the nanoscale filtration membrane.

[0074] The preparation method of the nano-scale filtration membrane is as follows:

[0075] 20 g of polyethersulfone, 140 g of dimethylformamide, and 30 g of a functional agent are mixed uniformly to obtain a mixed liquid; the mixed liquid is evenly spread on a substrate to form a thin film with a thickness of 1.5 μm; an airflow with an absolute humidity of 30 g H2O / kg is blown onto the surface of the film at a temperature of 40°C for treatment; the relative speed between the airflow and the film is 2 m / min, and the duration is 40 seconds; the treated film is immersed in water at a temperature of 5°C for curing for 40 seconds; after the curing is completed, the film is removed from the water and air-dried to form a nano-scale filtration membrane.

[0076] The functional agent is composed of perfluoro-N-methylpiperidine, (tetrahydrofurfuryloxypropyl)triethoxysilane and polyethylene glycol in a mass ratio of 1:1.5:3.

[0077] Comparative Example 1

[0078] The preparation method of ultra-small particle size nano bubble water is basically the same as that of Example 1, the only difference being the preparation method of the nanoscale filtration membrane.

[0079] The preparation method of the nano-scale filtration membrane is as follows:

[0080] 20 g of polyethersulfone, 140 g of dimethylformamide, and 30 g of a functional agent are mixed uniformly to obtain a mixed liquid; the mixed liquid is evenly spread on a substrate to form a thin film with a thickness of 1.5 μm; an airflow with an absolute humidity of 30 g H2O / kg is blown onto the surface of the film at a temperature of 40°C for treatment; the relative speed between the airflow and the film is 2 m / min, and the duration is 40 seconds; the treated film is immersed in water at a temperature of 5°C for curing for 40 seconds; after the curing is completed, the film is removed from the water and air-dried to form a nano-scale filtration membrane.

[0081] The functional agent is composed of perfluorotriethylamine, (tetrahydrofurfuryloxypropyl)triethoxysilane and polyethylene glycol in a mass ratio of 1:1.5:3.

[0082] Comparative Example 2

[0083] The preparation method of ultra-small particle size nano bubble water is basically the same as that of Example 1, the only difference being the preparation method of the nanoscale filtration membrane.

[0084] The preparation method of the nano-scale filtration membrane is as follows:

[0085] 20 g of polyethersulfone, 140 g of dimethylformamide, and 30 g of a functional agent are mixed uniformly to obtain a mixed liquid; the mixed liquid is evenly spread on a substrate to form a thin film with a thickness of 1.5 μm; an airflow with an absolute humidity of 30 g H2O / kg is blown onto the surface of the film at a temperature of 40°C for treatment; the relative speed between the airflow and the film is 2 m / min, and the duration is 40 seconds; the treated film is immersed in water at a temperature of 5°C for curing for 40 seconds; after the curing is completed, the film is removed from the water and air-dried to form a nano-scale filtration membrane.

[0086] The functional agent is composed of perfluorotributylamine, 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane and polyethylene glycol in a mass ratio of 1:1.5:3.

[0087] Comparative Example 3

[0088] A method for preparing ultra-small particle size nano bubble water is as follows:

[0089] Step 1: Use a raw water pump to extract tap water and transport it to a sand filter. The tap water first passes through the sand filter. As the water passes through the sand layer, large particles of suspended matter and impurities are intercepted by the sand and gravel. The water that has passed through the sand filter then flows into the activated carbon filter. The activated carbon absorbs impurities in the water. The pressurized water then passes through the reverse osmosis membrane, where dissolved solids and microorganisms are intercepted, producing pure water.

[0090] Step 2: Cool the purified water to 1°C, place the cooled water into a pressurizing device, introduce high-pressure nitrogen into the pressurizing device, control the pressure at 0.8 MPa, maintain the pressure for 40 minutes, and then release the pressure to normal pressure. During the entire preparation process, maintain the water temperature at 1°C to obtain ultra-small particle size nanobubble water.

[0091] Test Example 1

[0092] Nanobubble size distribution and concentration test:

[0093] Samples of the ultra-small nanobubble water prepared in the Examples and Comparative Examples were removed and transferred to suitable containers. The samples were analyzed using a nanoparticle tracer analyzer (NS300, Malvern) and a dynamic light scattering instrument (nano-ZS90, Malvern) under controlled environmental conditions (relative humidity 30±5%, temperature 25°C±5°C). The size distribution and concentration of the nanobubbles were measured and recorded. Specifically, large-sized nanobubbles (50-350 nm) and small-sized nanobubbles (less than 10 nm) were quantitatively analyzed. The measurement was repeated five times for each sample to ensure data accuracy. The test results are shown in Table 1.

[0094] Table 1

[0095] Experimental plan 50-350nm bubble concentration (pieces / mL) Bubble concentration less than 10nm (pieces / mL) Example 1 <![CDATA[7.8×10 7 ]]> <![CDATA[1.3×10 8 ]]> Example 2 <![CDATA[7.4×10 7 ]]> <![CDATA[1.1×10 8 ]]> Example 3 <![CDATA[7.3×10 7 ]]> <![CDATA[1.0×10 8 ]]> Example 4 <![CDATA[7.5×10 7 ]]> <![CDATA[1.2×10 8 ]]> Example 5 <![CDATA[7.3×10 7 ]]> <![CDATA[1.1×10 8 ]]> Example 6 <![CDATA[8.0×10 7 ]]> <![CDATA[1.5×10 8 ]]> Comparative Example 1 <![CDATA[7.2×10 7 ]]> <![CDATA[9.4×10 7 <!-- 6 -->]]> Comparative Example 2 <![CDATA[7.1×10 7 ]]> <![CDATA[9.3×10 7 ]]> Comparative Example 3 <![CDATA[6.8×10 7 ]]> <![CDATA[8.7×10 7 ]]>

[0096] Test Example 2

[0097] Test on the inhibitory effect on copper sheet oxidation:

[0098] First, the ultra-small particle size nanobubble water prepared in the examples and comparative examples was used as samples, and ultrapure water and commercially available purified water were used as controls, respectively. The samples were placed in sealed containers to maintain their purity. Next, a copper sheet was immersed in the sample and placed in an environment with controlled relative humidity (30±5%) and temperature (25°C±5°C) for 16 hours. Subsequently, a microplate reader (such as a VERSAmax microplate reader) was used to monitor the degree of oxidation of the copper sheet at different time points, recording the changes in the copper sheet surface caused by oxidation. The inhibitory effect on copper sheet oxidation was evaluated by comparison with a control group without sample addition. Throughout the testing process, consistency and repeatability of the operation must be ensured to improve the accuracy and reliability of the test results. The test results are shown in Table 2.

[0099] Table 2

[0100] Experimental plan Degree of substrate oxidation (absorption value) Example 1 0.75 Example 2 0.84 Example 3 0.85 Example 4 0.82 Example 5 0.88 Example 6 0.71 Comparative Example 1 0.95 Comparative Example 2 0.98 Comparative Example 3 1.21 Ultrapure water 2.73 Commercially available purified water 1.95

[0101] If the copper sheet remains substantially intact in the ultra-small particle size nanobubble water of the present invention, it indicates that the sample has significant antioxidant capacity.

[0102] It can be seen from the test results that the ultra-small particle size nanobubble water prepared in Example 1 of the present invention has a higher bubble concentration and a better inhibitory effect on the oxidation of the copper sheet.

[0103] The increase in nanobubbles is related to multiple factors, including the liquid's surface tension, viscosity, gas pressure, temperature, and the size of the bubble nucleus. Lower surface tension facilitates bubble formation and stability, as surface tension is a force that hinders bubble formation and growth. Liquid viscosity also affects bubble formation and growth: higher viscosity makes bubble formation more difficult, while lower viscosity accelerates bubble formation. Furthermore, changes in gas pressure and temperature affect the solubility of the gas in the liquid, which in turn affects bubble formation. The size of the bubble nucleus also influences bubble formation: smaller nuclei promote the formation of more nanobubbles. By controlling these factors during the preparation of nanobubble water, the number of nanobubbles can be effectively increased.

[0104] In Example 1 of the present invention, perfluorotributylamine is used as the functional agent of nano-scale filtration membrane. Compared with the different functional agents used in other embodiments, it helps to prepare ultra-small particle size nano bubble water with higher nano bubble concentration and stronger antioxidant effect. This may be related to the unique chemical properties of perfluorotributylamine. The nano-scale filtration membrane made with perfluorotributylamine may more effectively filter out those molecules that increase water viscosity and tension, thereby promoting the formation and stability of nano bubbles. Lower surface tension is conducive to the generation and stable existence of bubbles, while lower water viscosity accelerates the generation speed of bubbles. Therefore, the use of perfluorotributylamine may optimize the pore structure of nano-scale filtration membrane, obtain water molecules with lower surface tension and viscosity, make in the preparation of ultra-small particle size nano bubble water, the generation of bubbles is more efficient, and then improve the antioxidant capacity of bubble water.

[0105] In Example 1 of the present invention, (tetrahydrofurfuryloxypropyl)triethoxysilane was used as the raw material for the nanoscale filter membrane. Compared with the different silane compounds used in other embodiments, it can more effectively reduce the surface tension of water and filter out molecules that may increase water viscosity. These characteristics jointly promote the formation and stability of nanobubbles. The smaller pore size ensures the selectivity of the filter membrane, allowing smaller particles to pass through while trapping macromolecules that may increase water viscosity. Therefore, the nanoscale filter membrane prepared using (tetrahydrofurfuryloxypropyl)triethoxysilane not only increases the concentration of bubbles in the preparation process of ultra-small particle size nanobubble water, but also enhances the inhibitory effect on copper sheet oxidation.

[0106] In Example 6, the cyclic structure of perfluoro-N-methylpiperidine helps improve the selectivity of the nanofiltration membrane, preferentially filtering out macromolecules that could increase water viscosity, further reducing the viscosity and tension of the water. Because lower surface tension promotes the formation and stability of bubbles, while reducing water viscosity accelerates bubble generation, the nanofiltration membrane prepared using this functional agent can increase bubble concentration and enhance its antioxidant properties when preparing ultra-small particle size nanobubble water.

Claims

1. A method for preparing ultra-small particle size nano bubble water, characterized in that: Here’s how: Step 1: Use a raw water pump to extract tap water and transport it to a sand filter. The tap water first passes through the sand filter and is retained by the sand layer. The sand-filtered water then flows into an activated carbon filter. The pressurized water is retained by a reverse osmosis membrane to produce pure water. The pure water then flows into a precision filter, whose membrane is a nano-scale filter membrane, to obtain filtered water. Step 2: Cool the filtered water, place the cooled water into a pressurizing device, introduce high-pressure nitrogen into the pressurizing device, maintain the pressure and then release it to normal pressure. During the entire preparation process, maintain the water temperature at 0-5°C to obtain ultra-small particle size nanobubble water; The preparation method of the nano-scale filtration membrane is as follows, in parts by weight: 10-30 parts of polyethersulfone, 120-160 parts of dimethylformamide, and 20-40 parts of a functional agent are mixed uniformly to obtain a mixed solution, and the mixed solution is evenly spread on a substrate to form a thin film with a thickness of 0.5-3 μm. At a temperature of 30-50°C, an airflow with an absolute humidity of 20-40 g H2O / kg is blown onto the surface of the film for treatment. The relative speed between the airflow and the film is 1-3 m / min, and the duration is 20-60 seconds. The treated film is immersed in water at a temperature of 1-6°C for curing for 20-60 seconds. After the curing is completed, the film is removed from the water and air-dried to form a nano-scale filtration membrane. The functional agent is composed of a fluorine-containing compound, a silicon-containing compound and polyethylene glycol in a mass ratio of 0.5-2:1-2:2-4; The fluorine-containing compound is perfluoro-N-methylpiperidine; The silicon-containing compound is (tetrahydrofurfuryloxypropyl)triethoxysilane.

2. The method for preparing ultra-small particle size nano bubble water according to claim 1, wherein: In the step 2, the filtered water is cooled to 0-5°C.

3. The method for preparing ultra-small particle size nano bubble water according to claim 1, wherein: The pressure of the high-pressure nitrogen introduced in step 2 is controlled at 0.5-2 MPa.

4. The method for preparing ultra-small particle size nano bubble water according to claim 1, wherein: The pressure maintenance time of the high-pressure nitrogen in step 2 is controlled to be 30 to 60 minutes.

5. An ultra-small particle size nano bubble water, characterized in that: The method is as described in any one of claims 1 to 4.

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