Tissue fluid based on oil extension emulsifier, preparation method and application

Abstract

The invention relates to a tissue fluid based on an oil extension emulsifier, and a preparation method and application thereof. The tissue fluid comprises the following components in percentage by mass: 10-30% of Tween 20; 5%-20% of Tween 80; 1%-10% of an anionic surfactant; 0.1%-5% of soybean oil amide; and 50-70% of deionized water. According to the tissue fluid processing technology, broadband coverage is achieved through the dielectric property of an oily material in the working principle. The flat dielectric constant change and low conductivity of the soybean oil amide make the soybean oil amide become an ideal broadband material, and the dielectric constant of water has great influence on frequency change. Due to low dielectric constant and high solubility, the dielectric constant of water can be quickly lowered to be close to a target value, so that broadband operability is realized. The deviation between the relative dielectric constant and the electric conductivity of the human tissue simulation liquid provided by the invention and the standard value specified in the international standard is within the range of + / -10% of the standard value.

Description

Technical Field

[0001] The present invention relates to the technical field of human tissue simulation fluid, and in particular to a tissue fluid based on an oil-extended emulsifier, a preparation method and an application thereof. Background Art

[0002] In the current tissue fluid process technology, a common problem in the market is that it is impossible to produce a tissue fluid that covers a wide range of sub-6GHz required frequency bands. Since the requirements of each frequency band are different, users must change the tissue fluid multiple times according to the frequency band requirements when testing the object to be tested, resulting in huge time costs. In response to this problem, the existing solutions fail to provide tissue fluid technology suitable for multiple frequency bands, which limits the test efficiency and increases the complexity and cost of the operation. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a tissue fluid based on an oil-extended emulsifier, a preparation method and an application, which is a method of simplifying production based on oil extensions, replacing the traditional method of mixing oil with water and surfactants. By mixing non-ionic surfactants, ionic surfactants, water and emulsifiers in different proportions, a tissue fluid suitable for a wide band is obtained, and it meets the regulatory requirements of the sub-6GHz frequency band.

[0004] The above-mentioned object of the present invention is achieved through the following technical solutions: The first aspect of the present invention provides an tissue fluid based on an oil-extending emulsifier, which comprises, by weight percentage: Tween 20: 10%-30%; Tween 80: 5%-20%; anionic surfactant: 1%-10%; soybean oil amide: 0.1%-5%; and deionized water: 50-60%.

[0005] As a further technical solution of the present invention: calculated by mass percentage, it comprises: Tween 20: 16%; Tween 80: 13%; anionic surfactant: 5%; soybean oil amide: 4%; and deionized water: 62%.

[0006] As a further technical solution of the present invention: the anionic surfactant is sodium laureth sulfate.

[0007] The second aspect of the present invention provides a method for preparing an interstitial fluid based on an oil-extended emulsifier according to the first aspect, comprising the following steps: Step 1: preparing a basic solution, adding 10-30% w / w Tween 20 and 5-20% w / w Tween 80 in proportion to 50-70% w / w deionized water, mixing at 800 rpm for 30 minutes with a magnetic stirrer at 25°C, and controlling the dielectric constant of the mixed solution to reach a range of 40-60 at a frequency of 1 kHz; Step 2: Conductivity adjustment: add 1-10% w / w of anionic surfactant, use a conductivity meter for real-time monitoring, adjust the solution conductivity to 0.5-2.5S / m at 25°C, and control the stirring speed at 500rpm; Step 3: Bandwidth optimization, introducing 0.1%-5% w / w soybean oil amide as an emulsifier, ultrasonically treating in a 40°C water bath for 15 minutes, with a power of 100 W and a frequency of 40 kHz, so that the dielectric constant fluctuation of the solution in the frequency range of 1-100 MHz is less than ±5%; Step 4: pH value control. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing 0.5-3% w / w of a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1). The pH value of the solution is adjusted to the range of 5.5-6.5 by monitoring with a pH meter. During the adjustment process, the solution temperature is maintained at 25±2°C.

[0008] The third aspect of the present invention provides the use of the tissue fluid based on oil-type extended emulsifier described in the first aspect in the electromagnetic wave energy specific absorption rate test of mobile communication equipment.

[0009] As a further technical solution of the present invention: the tissue fluid is used to support the electromagnetic wave energy absorption rate test of 5G NRSub-6GHz mobile communication equipment.

[0010] As a further technical solution of the present invention: the tissue fluid is used for testing the electromagnetic wave energy specific absorption rate of mobile communication equipment within a frequency range of 600 MHz to 10000 MHz.

[0011] In summary, the present invention includes at least one of the following beneficial technical effects: The present invention discloses a tissue fluid based on an oil-extended emulsifier, a preparation method and an application. In terms of the working principle, this tissue fluid process technology replaces traditional mineral oil with oil derivatives, and its dielectric properties achieve broadband coverage. An anionic surfactant (such as sodium lauryl polyether sulfate) with specific conductive properties is introduced as a conductivity regulator, and the dielectric constant of water has a greater effect on frequency changes. The synergistic effect of these three mechanisms ultimately forms a broadband simulated tissue fluid system with excellent frequency response characteristics, thereby achieving broadband operability. The tissue fluid finally obtained can cover a frequency range of 600MHz to 10000MHz, greatly improving the efficiency of the test and reducing the number of tissue fluid changes. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0013] Embodiment 1: A method for preparing tissue fluid based on oil-based extended emulsifier comprises the following steps: Step 1: Preparation of a basic solution: 10% w / w Tween 20 and 20% w / w Tween 80 were added to 60% w / w deionized water in proportion, and mixed at 800 rpm for 30 minutes using a magnetic stirrer at 25°C, and the dielectric constant of the mixed solution was controlled to be in the range of 40-60 at a frequency of 1 kHz; Step 2: Conductivity adjustment: add 5% w / w anionic surfactant, use a conductivity meter for real-time monitoring, adjust the solution conductivity to 0.5-2.5 S / m at 25°C, and control the stirring speed at 500 rpm; Step 3: bandwidth optimization, introducing 5% w / w soybean oil amide as an emulsifier, ultrasonic treatment in a 40°C water bath for 15 minutes, power 100 W, frequency 40 kHz, so that the dielectric constant fluctuation range of the solution in the frequency range of 1-100 MHz is less than ±5%; Step 4: pH value control. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing 0.5-3% w / w of a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1). The pH value of the solution is adjusted to the range of 5.5-6.5 by monitoring with a pH meter. During the adjustment process, the solution temperature is maintained at 25±2°C.

[0014] The above tissue fluid was placed in a container, and the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured using SPEAG's DAK dielectric probe kit and conductivity meter. After 6 months, the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured again. The measurement results are shown in Table 1: Table 1 Embodiment 2: A method for preparing tissue fluid based on oil-based extended emulsifier comprises the following steps: Step 1: Preparation of a basic solution: 20% w / w Tween 20 and 5% w / w Tween 80 were added to 69.9% w / w deionized water in proportion, and mixed at 800 rpm for 30 minutes using a magnetic stirrer at 25°C, and the dielectric constant of the mixed solution was controlled to be in the range of 40-60 at a frequency of 1 kHz; Step 2: Conductivity adjustment: add 5% w / w anionic surfactant, use a conductivity meter for real-time monitoring, adjust the solution conductivity to 0.5-2.5 S / m at 25°C, and control the stirring speed at 500 rpm; Step 3: bandwidth optimization, introducing 0.1% w / w soybean oil amide as an emulsifier, ultrasonic treatment in a 40°C water bath for 15 minutes, power 100 W, frequency 40 kHz, so that the dielectric constant fluctuation range of the solution in the frequency range of 1-100 MHz is less than ±5%; Step 4: pH value control. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing 0.5-3% w / w of a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1). The pH value of the solution is adjusted to the range of 5.5-6.5 by monitoring with a pH meter. During the adjustment process, the solution temperature is maintained at 25±2°C.

[0015] The tissue fluid was placed in a container, and the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured using SPEAG's DAK dielectric probe kit and conductivity meter. After 6 months, the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured again. The measurement results are shown in Table 2: Table 2 Embodiment three: A method for preparing tissue fluid based on oil-based extended emulsifier comprises the following steps: Step 1: Preparation of a basic solution: 30% w / w Tween 20 and 13% w / w Tween 80 were added to 52% w / w deionized water in proportion, and mixed at 800 rpm for 30 minutes using a magnetic stirrer at 25°C, and the dielectric constant of the mixed solution was controlled to be in the range of 40-60 at a frequency of 1 kHz; Step 2: Conductivity adjustment: add 3% w / w anionic surfactant, use a conductivity meter for real-time monitoring, adjust the solution conductivity to 0.5-2.5 S / m at 25°C, and control the stirring speed at 500 rpm; Step 3: bandwidth optimization, introducing 2% w / w soybean oil amide as an emulsifier, ultrasonic treatment in a 40°C water bath for 15 minutes, power 100 W, frequency 40 kHz, so that the dielectric constant fluctuation range of the solution in the frequency range of 1-100 MHz is less than ±5%; Step 4: pH value control. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing 0.5-3% w / w of a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1). The pH value of the solution is adjusted to the range of 5.5-6.5 by monitoring with a pH meter. During the adjustment process, the solution temperature is maintained at 25±2°C.

[0016] The above tissue fluid was placed in a container, and the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured using SPEAG's DAK dielectric probe kit and conductivity meter. After 6 months, the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured again. The measurement results are shown in Table 3: Table 3 Embodiment 4: A method for preparing tissue fluid based on oil-based extended emulsifier comprises the following steps: Step 1: Preparation of a basic solution: 10% w / w Tween 20 and 20% w / w Tween 80 were added to 55% w / w deionized water in proportion, and mixed at 800 rpm for 30 minutes using a magnetic stirrer at 25°C, and the dielectric constant of the mixed solution was controlled to be in the range of 40-60 at a frequency of 1 kHz; Step 2: Conductivity adjustment: add 10% w / w anionic surfactant, use a conductivity meter for real-time monitoring, adjust the solution conductivity to 0.5-2.5 S / m at 25°C, and control the stirring speed at 500 rpm; Step 3: bandwidth optimization, introducing 5% w / w soybean oil amide as an emulsifier, ultrasonic treatment in a 40°C water bath for 15 minutes, power 100 W, frequency 40 kHz, so that the dielectric constant fluctuation range of the solution in the frequency range of 1-100 MHz is less than ±5%; Step 4: pH value control. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing 0.5-3% w / w of a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1). The pH value of the solution is adjusted to the range of 5.5-6.5 by monitoring with a pH meter. During the adjustment process, the solution temperature is maintained at 25±2°C.

[0017] The above tissue fluid was placed in a container, and the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured using SPEAG's DAK dielectric probe kit and conductivity meter. After 6 months, the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured again. The measurement results are shown in Table 4: Table 4 Embodiment five: A method for preparing tissue fluid based on oil-based extended emulsifier comprises the following steps: Step 1: Preparation of a basic solution: 18% w / w Tween 20 and 12% w / w Tween 80 were added to 64% w / w deionized water in proportion, and mixed at 800 rpm for 30 minutes using a magnetic stirrer at 25°C, and the dielectric constant of the mixed solution was controlled to be in the range of 40-60 at a frequency of 1 kHz; Step 2: Conductivity adjustment: add 1% w / w anionic surfactant, use a conductivity meter for real-time monitoring, adjust the solution conductivity to 0.5-2.5 S / m at 25°C, and control the stirring speed at 500 rpm; Step 3: bandwidth optimization, introducing 5% w / w soybean oil amide as an emulsifier, ultrasonic treatment in a 40°C water bath for 15 minutes, power 100 W, frequency 40 kHz, so that the dielectric constant fluctuation range of the solution in the frequency range of 1-100 MHz is less than ±5%; Step 4: pH value control. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing 0.5-3% w / w of a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1). The pH value of the solution is adjusted to the range of 5.5-6.5 by monitoring with a pH meter. During the adjustment process, the solution temperature is maintained at 25±2°C.

[0018] The above tissue fluid was placed in a container, and the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured using SPEAG's DAK dielectric probe kit and conductivity meter. After 6 months, the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured again. The measurement results are shown in Table 5: Table 5 Embodiment six: A method for preparing tissue fluid based on oil-based extended emulsifier comprises the following steps: Step 1: Preparation of a basic solution: 22% w / w Tween 20 and 20% w / w Tween 80 were added to 50% w / w deionized water in proportion, and mixed at 800 rpm for 30 minutes using a magnetic stirrer at 25°C, and the dielectric constant of the mixed solution was controlled to be in the range of 40-60 at a frequency of 1 kHz; Step 2: Conductivity adjustment: add 4% w / w anionic surfactant, use a conductivity meter for real-time monitoring, adjust the solution conductivity to 0.5-2.5 S / m at 25°C, and control the stirring speed at 500 rpm; Step 3: bandwidth optimization, introducing 4% w / w soybean oil amide as an emulsifier, ultrasonic treatment in a 40°C water bath for 15 minutes, power 100 W, frequency 40 kHz, so that the dielectric constant fluctuation range of the solution in the frequency range of 1-100 MHz is less than ±5%; Step 4: pH value control. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing 0.5-3% w / w of a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1). The pH value of the solution is adjusted to the range of 5.5-6.5 by monitoring with a pH meter. During the adjustment process, the solution temperature is maintained at 25±2°C.

[0019] The above tissue fluid was placed in a container, and the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured using SPEAG's DAK dielectric probe kit and conductivity meter. After 6 months, the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured again. The measurement results are shown in Table 6: Table 6 Embodiment seven: A method for preparing tissue fluid based on oil-based extended emulsifier comprises the following steps: Step 1: Preparation of a basic solution: 10% w / w Tween 20 and 5% w / w Tween 80 were added to 70% w / w deionized water in proportion, and mixed at 800 rpm for 30 minutes using a magnetic stirrer at 25°C, and the dielectric constant of the mixed solution was controlled to be in the range of 40-60 at a frequency of 1 kHz; Step 2: Conductivity adjustment: add 10% w / w anionic surfactant, use a conductivity meter for real-time monitoring, adjust the solution conductivity to 0.5-2.5 S / m at 25°C, and control the stirring speed at 500 rpm; Step 3: bandwidth optimization, introducing 5% w / w soybean oil amide as an emulsifier, ultrasonic treatment in a 40°C water bath for 15 minutes, power 100 W, frequency 40 kHz, so that the dielectric constant fluctuation range of the solution in the frequency range of 1-100 MHz is less than ±5%; Step 4: pH value control. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing 0.5-3% w / w of a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1). The pH value of the solution is adjusted to the range of 5.5-6.5 by monitoring with a pH meter. During the adjustment process, the solution temperature is maintained at 25±2°C.

[0020] The tissue fluid was placed in a container, and the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured using SPEAG's DAK dielectric probe kit and conductivity meter. After 6 months, the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured again. The measurement results are shown in Table 7: Table 7 Embodiment eight: A method for preparing tissue fluid based on oil-based extended emulsifier comprises the following steps: Step 1: Preparation of a basic solution: 16% w / w Tween 20 and 13% w / w Tween 80 were added to 62% w / w deionized water in proportion, and mixed at 800 rpm for 30 minutes using a magnetic stirrer at 25°C, and the dielectric constant of the mixed solution was controlled to be in the range of 40-60 at a frequency of 1 kHz; Step 2: Conductivity adjustment: add 5% w / w anionic surfactant, use a conductivity meter for real-time monitoring, adjust the solution conductivity to 0.5-2.5 S / m at 25°C, and control the stirring speed at 500 rpm; Step 3: bandwidth optimization, introducing 4% w / w soybean oil amide as an emulsifier, ultrasonic treatment in a 40°C water bath for 15 minutes, power 100 W, frequency 40 kHz, so that the dielectric constant fluctuation range of the solution in the frequency range of 1-100 MHz is less than ±5%; Step 4: pH value control. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing 0.5-3% w / w of a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1). The pH value of the solution is adjusted to the range of 5.5-6.5 by monitoring with a pH meter. During the adjustment process, the solution temperature is maintained at 25±2°C.

[0021] The above tissue fluid was placed in a container, and the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured using SPEAG's DAK dielectric probe kit and conductivity meter. After 6 months, the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600MHz to 10000MHz were measured again. The measurement results are shown in Table 8: Table 8 As shown in Tables 1 to 8, the tissue fluid provided by the present invention meets the following requirements: 1. Dielectric constant test: The stability of the dielectric constant was tested in the frequency band from 600MHz to 10000MHz, showing a low rate of change of tissue fluid in a wide band.

[0022] 2. Stability test: Long-term stability test to confirm that the liquid phase stability can be maintained for at least 6 months.

[0023] 3. Conductivity test: Test the conductivity at different frequency bands to ensure that the tissue fluid can still maintain low conductivity in the high frequency band to meet various test requirements.

[0024] In the technical solution of the present invention, the main ingredients used include Tween 20, Tween 80, sodium laureth sulfate, soybean oil amide, deionized water and the like.

[0025] Soybean amide: plays an important role in the oil phase, helping to maintain consistent dielectric properties over a wide bandwidth due to its low conductivity and flat dielectric constant variation.

[0026] Surfactants (Tween 80, Tween 20): They can quickly reduce the dielectric constant of the solution and have good solubility. Water is a high dielectric material, and using non-ionic surfactants to reduce the dielectric constant is an effective way.

[0027] Deionized water: As the main component of the water phase, the dielectric constant of water is controlled by appropriate mixing ratio to achieve a broadband operating range.

[0028] The present invention proposes an innovative method, avoiding the traditional method of directly using oil, water and emulsifiers, and instead using substances with water-soluble properties and derived from oils. We found that such substances have a relatively flat dielectric constant difference curve, so soybean amide is used in this application without utilizing its thickening properties. Soybean amide is a multi-purpose surfactant and can also be used as a thickener in daily chemical products. However, the solubility of such substances is generally low and cannot significantly reduce the dielectric constant of water, so we use other non-ionic surfactants, such as Tween 20 and Tween 80. These two non-ionic surfactants have good water solubility, while Triton-X100 may produce a milky white liquid, and the stability is difficult to control.

[0029] In terms of conductivity control, this application uses sodium laureth sulfate (also known as coconut oil foaming agent in some areas because its ingredients can be extracted from coconuts). The conductivity of zwitterionic surfactants is far from the target value and lacks an effective control mechanism. Therefore, this application selects common anionic surfactants as a control method, which is the core point of the present invention.

[0030] The control mechanism of this application is as follows: The substrate is water, which has a dielectric constant of about 80.

[0031] A nonionic surfactant was used for coarse adjustment to reduce the dielectric constant to the range of 40-50, at which point the dielectric constant had a difference of approximately ±15% at the operating frequency.

[0032] The dielectric constant difference was further adjusted to ±10% by soy amide.

[0033] Finally, anionic surfactant was added to adjust the conductivity to the target value.

[0034] This method not only improves the stability of the liquid, but also simplifies the process and avoids potential problems of traditional oil-water emulsion systems.

[0035] The implementation principle of the present invention is as follows: the present invention discloses a tissue fluid based on an oil-extended emulsifier, a preparation method and an application. In terms of the working principle, this tissue fluid process technology achieves broadband coverage through the dielectric properties of the emulsifier material of the oil derivative. The flat dielectric constant change and low conductivity of soybean oil amide make it an ideal broadband material, while the dielectric constant of water has a greater impact on frequency changes. Non-ionic surfactants are used for coarse adjustment of the dielectric constant, and soybean oil amide is used for fine adjustment, thereby achieving broadband operability. Since the selected materials are all stable solutions that can be formed in water, the stability of the human tissue simulation fluid is greatly improved. The tissue fluid finally obtained can cover a frequency range of 600MHz to 10000MHz, which greatly improves the efficiency of the test and reduces the number of tissue fluid replacements.

[0036] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil-based extended emulsifier tissue fluid, characterized in that In terms of mass percentage, it includes: Tween 20: 10%-30%; Tween 80: 5%-20%; Anionic surfactant: 1%-10%; Soybean amide: 0.1%-5%; Deionized water: 50-70%.

2. The tissue fluid based on oil-extending emulsifier according to claim 1, characterized in that: In terms of mass percentage, it includes: Tween 20: 16%; Tween 80: 13%; Anionic surfactant: 5%; Soybean amide: 4%; Deionized water: 62%.

3. The tissue fluid based on oil-extended emulsifier according to any one of claims 1 to 2, characterized in that: The anionic surfactant is sodium laureth sulfate.

4. A method for preparing tissue fluid based on oil-based extended emulsifier, characterized in that: The following steps are involved: Step 1: preparing a basic solution, adding 10-30% w / w Tween 20 and 5-20% w / w Tween 80 in proportion to 50-70% w / w deionized water, mixing at 800 rpm for 30 minutes with a magnetic stirrer at 25°C, and controlling the dielectric constant of the mixed solution to reach a range of 40-60 at a frequency of 1 kHz; Step 2: Conductivity adjustment: add 1-10% w / w of anionic surfactant, use a conductivity meter for real-time monitoring, adjust the solution conductivity to 0.5-2.5S / m at 25°C, and control the stirring speed at 500rpm; Step 3: Bandwidth optimization, introducing 0.1%-5% w / w soybean oil amide as an emulsifier, ultrasonic treatment in a 40°C water bath for 15 minutes, power 100W, frequency 40kHz, so that the dielectric constant fluctuation range of the solution in the frequency range of 1-100MHz is less than ±5%; Step 4: pH value regulation. When the pH value of the solution is between 4 and 7, add phosphate buffer and adjust the pH value of the solution to the range of 5.5-6.5 by monitoring with a pH meter. During the adjustment process, keep the solution temperature at 25±2°C.

5. Application of the tissue fluid based on oil-based emulsifier as described in any one of claims 1 to 2 in electromagnetic wave energy specific absorption rate testing of mobile communication equipment.

6. The use of an oil-based extended emulsifier-based tissue fluid in electromagnetic wave energy specific absorption rate testing of mobile communication equipment according to claim 5, characterized in that: The tissue fluid is used to support the electromagnetic wave energy specific absorption rate test of 5G NRSub-6GHz mobile communication equipment.

7. The use of an oil-based extended emulsifier-based tissue fluid in electromagnetic wave energy specific absorption rate testing of mobile communication equipment according to claim 5, characterized in that: The tissue fluid is used for testing the electromagnetic wave energy specific absorption rate of mobile communication equipment within a frequency range of 600 MHz to 10000 MHz.

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