Nanometer bubble water with ultra-small particle size and preparation method thereof

Abstract

The invention discloses nano bubble water with ultra-small particle size and a preparation method thereof, and belongs to the technical field of bubble water preparation, and the method comprises the following steps: firstly purifying tap water through the steps of sand filtration, activated carbon filtration, reverse osmosis and the like, and then carrying out further refined filtration by using a nanoscale filter membrane to obtain purified water. After cooling, the water is placed in a pressurizing device, high-pressure nitrogen is introduced, pressure is released, and the nano bubble water with the ultra-small particle size is formed. Compared with the prior art, the nano-bubble water prepared by the invention not only has high bubble concentration, but also shows excellent oxidation resistance, and can be used for improving the quality of drinking water and enhancing the health benefits of the drinking water.

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 improvement of people's health awareness, the requirements for drinking water quality are becoming increasingly stringent. As a new type of beverage, sparkling water is favored by consumers due to its potential health benefits, such as promoting digestion, enhancing immunity and anti-oxidation. However, the existing sparkling water preparation technology has several shortcomings, which limits the improvement of sparkling water quality and functionality.

[0003] Ultra-small nanobubbles refer to bubbles with a diameter less than 100 nanometers, and their particle size range is usually between 1 nanometer and 100 nanometers. Such ultra-small nanobubbles have unique physical and chemical properties, such as high specific surface area, surface energy, good dispersibility and stability.

[0004] First, the existing technology usually faces the problem of uneven bubble size distribution when preparing sparkling water, which affects the uniformity and taste of the sparkling water. In addition, the poor stability of bubbles is also a challenge. The bubbles are easy to break, which makes the storage and transportation of sparkling water difficult. Secondly, the removal of impurities in the water during the existing sparkling water preparation process is not thorough enough, which not only affects the taste and appearance of the sparkling water, but also may reduce its health benefits. If impurities such as soluble solids, microorganisms and other organic matter in the water are not effectively removed, they may pose potential risks to consumers' health. Furthermore, the generation and stability of bubbles are affected by multiple factors such as the surface tension, viscosity, gas pressure and temperature of the liquid. The existing technology has limitations in controlling these parameters to achieve the ideal bubble size and stability, resulting in uneven performance of sparkling water products. Finally, the existing sparkling water preparation technology also needs to be improved in terms of environmental friendliness. Some traditional methods may consume more energy, generate more waste, and burden 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 of micro-nano bubbles and insufficient stability in the preparation process of bubble water, which may affect the overall quality of bubble water and hinder the stable existence of bubbles in water. The process includes the following steps: first, prepare pure water, then mix the pure water, then prepare pure air, then mix the pure water and air, and finally treat the pure water using ultrasonic cavitation technology. Through the action of ultrasonic generator and transducer, the bubbles in the pure water are quickly disintegrated to generate 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 terms of bubble size uniformity, stability, impurity removal efficiency and environmental impact, and 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 solve 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, which is filtered through sand and activated carbon, and then processed through a reverse osmosis membrane and a nano-scale precision filter to obtain filtered water;

[0010] Step 2: Cool the filtered water and put it into a pressurizing device, introduce high-pressure nitrogen and then release the pressure to obtain ultra-small particle size nano bubble 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 that has passed the sand filter 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. The filter membrane of the precision filter is a nano-scale filter membrane to obtain filtered water.

[0013] Step 2: Cool the filtered water, put 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, the water temperature is maintained to obtain ultra-small particle size nano bubble 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 introduced in step 2 is controlled to be 30 to 60 minutes.

[0017] In step 2, the water temperature is maintained at 0-5° C. during the entire 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 thin film, the thin film is treated with airflow, and the treated thin film is solidified in water. After the solidification is completed, the thin 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 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 s. The treated film is immersed in water with a temperature of 1-6°C for curing, and the duration is 20-60 s. 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 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 filter membrane on molecules that may increase the viscosity of water.

[0031] High-pressure nitrogen gas During the preparation of ultra-small particle size nanobubble water, high-pressure nitrogen gas is used in the pressurization step 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 prior art, it has the following beneficial effects:

[0035] 1) The ultra-small particle size nano bubble water of the present invention shows a higher bubble concentration and a stronger antioxidant effect. This is mainly due to the use of a nano-scale filtration membrane, which can effectively filter out molecules that increase the viscosity and surface tension of water, thereby promoting the formation and stability of nano bubbles. In addition, the presence of ultra-small particle size nano bubbles makes the water have a certain antioxidant capacity, which helps to protect the substrate from damage caused by reactive oxygen oxidation.

[0036] 2) The ultra-small nanobubble water of the present invention has a higher bubble concentration, and 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, making it have a better taste and biocompatibility, but also may have a positive impact on human health, such as promoting digestion, enhancing immunity, etc.

[0037] 3) The present invention provides an innovative ultra-small particle size nano bubble water preparation technology, which produces ultra-small particle size nano bubbles with high concentration and high stability by precisely controlling the water treatment and pressurization process, including sand filtration, activated carbon filtration, reverse osmosis and nano-level precision filtration, and subsequent cooling and high-pressure nitrogen pressurization treatment. This method not only improves production efficiency, but also ensures product quality, making it a safer, healthier and more efficient choice for drinking pure water. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a real picture after the test of the inhibitory effect of test example 2 on copper sheet oxidation. 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 embodiments may be air, oxygen or nitrogen.

[0044] The design idea of ​​the present invention is to develop an innovative ultra-small particle size nano bubble water preparation technology, which aims to produce ultra-small particle size nano bubbles with high concentration and high stability through precise control of water treatment and pressurization process, including sand filtration, activated carbon filtration, reverse osmosis and nano-level precision filtration, and subsequent cooling and high-pressure nitrogen pressurization treatment. This nano bubble water is not only suitable for improving the quality of drinking water, making it have better taste and biocompatibility, but also has a significant antioxidant effect, which helps to enhance the physiological functions and health benefits of water, thereby providing consumers with a safer, healthier and more efficient drinking pure 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 solids and impurities are intercepted by sand and gravel. The water that has passed through the sand filter then flows into the activated carbon filter. The activated carbon adsorbs impurities in the water. Then the pressurized water passes through the reverse osmosis membrane. Dissolved solids and microorganisms are intercepted to produce pure water. The pure 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, put the cooled water into a pressurizing device, introduce high-pressure nitrogen into the pressurizing device, control the pressure at 0.8MPa, 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 nano bubble 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 functional agent are mixed evenly to obtain a mixed solution; the mixed solution 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 s; the treated film is immersed in water at a temperature of 5°C for curing for 40 s; after the curing is completed, the film is taken out of 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 method for preparing ultra-small particle size nano bubble water is basically the same as that in Example 1, the only difference being that the method for preparing the nanoscale filtration membrane is different.

[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 functional agent are mixed evenly to obtain a mixed solution; the mixed solution 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 s; the treated film is immersed in water at a temperature of 5°C for curing for 40 s; after the curing is completed, the film is taken out of 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 method for preparing ultra-small particle size nano bubble water is basically the same as that in Example 1, the only difference being that the method for preparing the nanoscale filtration membrane is different.

[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 functional agent are mixed evenly to obtain a mixed solution; the mixed solution 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 s; the treated film is immersed in water at a temperature of 5°C for curing for 40 s; after the curing is completed, the film is taken out of 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 method for preparing ultra-small particle size nano bubble water is basically the same as that in Example 1, the only difference being that the method for preparing the nanoscale filtration membrane is different.

[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 functional agent are mixed evenly to obtain a mixed solution; the mixed solution 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 s; the treated film is immersed in water at a temperature of 5°C for curing for 40 s; after the curing is completed, the film is taken out of 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 method for preparing ultra-small particle size nano bubble water is basically the same as that in Example 1, the only difference being that the method for preparing the nanoscale filtration membrane is different.

[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 functional agent are mixed evenly to obtain a mixed solution; the mixed solution 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 s; the treated film is immersed in water at a temperature of 5°C for curing for 40 s; after the curing is completed, the film is taken out of 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 method for preparing ultra-small particle size nano bubble water is basically the same as that in Example 1, the only difference being that the method for preparing the nanoscale filtration membrane is different.

[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 functional agent are mixed evenly to obtain a mixed solution; the mixed solution 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 s; the treated film is immersed in water at a temperature of 5°C for curing for 40 s; after the curing is completed, the film is taken out of 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 method for preparing ultra-small particle size nano bubble water is basically the same as that in Example 1, the only difference being that the method for preparing the nanoscale filtration membrane is different.

[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 functional agent are mixed evenly to obtain a mixed solution; the mixed solution 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 s; the treated film is immersed in water at a temperature of 5°C for curing for 40 s; after the curing is completed, the film is taken out of 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 method for preparing ultra-small particle size nano bubble water is basically the same as that in Example 1, the only difference being that the method for preparing the nanoscale filtration membrane is different.

[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 functional agent are mixed evenly to obtain a mixed solution; the mixed solution 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 s; the treated film is immersed in water at a temperature of 5°C for curing for 40 s; after the curing is completed, the film is taken out of 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. When the water passes through the sand layer, large particles of suspended solids and impurities are intercepted by 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. Then, the pressurized water passes through a reverse osmosis membrane, and dissolved solids and microorganisms are intercepted to produce pure water.

[0090] Step 2: Cool the purified water to 1°C, put the cooled water into a pressurizing device, introduce high-pressure nitrogen into the pressurizing device, control the pressure at 0.8MPa, 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 nano bubble water.

[0091] Test Example 1

[0092] Nanobubble size distribution and concentration test:

[0093] Samples were taken from the ultra-small particle size nanobubble water prepared in the examples and comparative examples, transferred to suitable containers, and 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), and the size distribution and concentration of the nanobubbles were measured and recorded; specifically, large particle size nanobubbles (50-350nm) and small particle size nanobubbles (less than 10nm) were quantitatively analyzed, and each sample was measured 5 times to ensure the accuracy of the data; the test results are shown in Table 1.

[0094] Table 1

[0095] Experimental protocol 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 embodiment and the comparative example was taken as a sample, and ultrapure water and commercially available pure water were used as the control group, respectively, and the sample was placed in a sealed container to keep it pure. Next, the copper sheet was immersed in the sample, and the sample was placed in an environment with controlled relative humidity (30±5%) and temperature (25°C±5°C) for 16 hours. Subsequently, an ELISA reader (such as VERSAmax microplate reader) was used to monitor the degree of oxidation of the copper sheet at different time points, and the changes in the surface of the copper sheet due to oxidation were recorded. The inhibitory effect on the oxidation of the copper sheet was evaluated by comparing with the control group without adding the sample. During the entire test process, the 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 protocol Substrate oxidation degree (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 nano bubble 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 nano bubble 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 surface tension, viscosity, gas pressure, temperature and size of the bubble nucleus of the liquid. Lower surface tension helps the formation and stability of bubbles, because surface tension is a force that hinders the formation and growth of bubbles. The viscosity of the liquid will also affect the generation and growth of bubbles. When the viscosity is higher, it is more difficult to generate bubbles, while when the viscosity is lower, the bubble generation speed is faster. In addition, changes in gas pressure and temperature will affect the solubility of the gas in the liquid, thereby affecting the formation of bubbles. The size of the bubble nucleus will also affect the formation of bubbles. Smaller bubble nuclei help to generate more nanobubbles. In the process of preparing nanobubble water, by controlling these factors, the number of nanobubbles can be effectively increased.

[0104] In embodiment 1 of the present invention, perfluorotributylamine is used as the functional agent of nanometer filter membrane, and 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 nanometer filter membrane made of 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 nanometer filter membrane, obtain water molecules with lower surface tension and viscosity, make the generation of bubbles more efficient in the preparation of ultra-small particle size nano bubble water, and then improve the antioxidant capacity of bubble water.

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

[0106] In Example 6, the ring structure of perfluoro-N-methylpiperidine helps to improve the selectivity of the nanofiltration membrane, preferentially filters out macromolecules that may increase the viscosity of water, and further reduces the viscosity and tension of water. Since 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 the bubble concentration and enhance its antioxidant properties when preparing ultra-small particle size nano bubble water.

Claims

1. A method for preparing ultra-small particle size nano bubble water, characterized in that: Here’s how: Step 1: The raw water pump draws tap water, which is filtered through sand and activated carbon, and then processed through a reverse osmosis membrane and a precision filter with a nano-scale filter membrane to obtain filtered water; Step 2: Cool the filtered water and put it into a pressurizing device, introduce high-pressure nitrogen and then release the pressure to obtain ultra-small particle size nano bubble water; The preparation method of the nano-scale filtration membrane is as follows: The polyethersulfone, dimethylformamide and a functional agent are mixed to form a mixed liquid; the mixed liquid is spread on a substrate to form a thin film, the thin film is treated with airflow, and the treated thin film is solidified in water. After the solidification is completed, the thin film is taken out and air-dried to form a nano-scale filtration membrane; The functional agent consists of a fluorine-containing compound, a silicon-containing compound and polyethylene glycol.

2. The method for preparing ultra-small particle size nano bubble water according to claim 1, 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 water that has passed the sand filter 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. The filter membrane of the precision filter is a nano-scale filter membrane to obtain filtered water. Step 2: Cool the filtered water, put 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, keep the water temperature at 0-5°C to obtain ultra-small particle size nano bubble water.

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

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

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

6. The method for preparing ultra-small particle size nano bubble water according to claim 1 or 2, characterized in that: 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 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 20-40g H2O / kg is blown onto the surface of the film for treatment. The relative speed between the airflow and the film is 1-3m / min, and the duration is 20-60s. The treated film is immersed in water with a temperature of 1-6°C for curing for 20-60s. After the curing is completed, the film is taken out of the water and air-dried to form a nano-scale filtration membrane.

7. The method for preparing ultra-small particle size nano bubble water according to claim 6, characterized in that: 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.

8. The method for preparing ultra-small particle size nano bubble water according to claim 7, characterized in that: The fluorine-containing compound is at least one of perfluoro-N, N-bis(perfluoroethyl)propylamine, 1-fluoroamine, perfluorotributylamine, and perfluoro-N-methylpiperidine.

9. The method for preparing ultra-small particle size nano bubble water according to claim 7, characterized in that: 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.

10. An ultra-small particle size nano bubble water, characterized in that: The method is prepared by the preparation method according to any one of claims 1 to 9.

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