A tissue fluid based on an oil-based extender emulsifier, a preparation method and an application

Abstract

The present invention relates to a tissue fluid based on an oil-based extender emulsifier, a preparation method and an application thereof. The tissue fluid comprises, by mass percentage: Tween 20: 10% - 30%; Tween 80: 5% - 20%; an anionic surfactant: 1% - 10%; soy oil amide: 0.1% - 5%; deionized water: 50 - 70%. The manufacturing process technology of this tissue fluid realizes broadband coverage through the dielectric properties of oil-based materials. The flat dielectric constant change and low conductivity of soy oil amide make it an ideal broadband material, while the dielectric constant of water has a greater influence on frequency changes. Because of its low dielectric constant and high solubility, it can quickly reduce the dielectric constant of water to near the target value, thereby realizing broadband operability. The deviation of the relative dielectric constant and conductivity of the simulated fluid of the human tissue simulation fluid provided by the present invention from the standard values specified in the international standard is within the range of ±10% of the standard values.

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-based extended emulsifier, a preparation method and an application thereof. Background Art

[0002] In the current tissue fluid manufacturing technology, the common problem in the market is that it is impossible to produce a tissue fluid that covers a wide range of sub-6GHz demand frequency bands. Since the requirements for each frequency band are different, when users test the object to be measured, they must replace the tissue fluid multiple times according to the frequency band requirements, resulting in huge time costs. In response to this problem, the existing solutions fail to provide a tissue fluid technology applicable to multiple frequency bands, restricting the test efficiency and increasing the complexity and cost of operation. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a tissue fluid based on an oil-based extended emulsifier, a preparation method and an application thereof. It is a way to simplify production based on oil-based extensions, replacing the traditional method of using oil, water and surfactants. By mixing non-ionic surfactants, ionic surfactant water and emulsifiers in different proportions, a tissue fluid applicable to a wide frequency band can be obtained, and it meets the regulatory requirements of the sub-6GHz frequency band.

[0004] The above object of the present invention is achieved by the following technical solutions:

[0005] The first aspect of the present invention provides a tissue fluid based on an oil-based extended emulsifier, which, in terms of mass percentage content, comprises: Tween 20: 10%-30%; Tween 80: 5%-20%; anionic surfactant: 1%-10%; soy oil amide: 0.1%-5%; deionized water: 50-60%.

[0006] As a further technical solution of the present invention: in terms of mass percentage content, it comprises: Tween 20: 16%; Tween 80: 13%; anionic surfactant: 5%; soy oil amide: 4%; deionized water: 62%.

[0007] As a further technical solution of the present invention: the anionic surfactant is sodium lauryl polyether sulfate.

[0008] The second aspect of the present invention provides a preparation method of the tissue fluid based on an oil-based extended emulsifier described in the first aspect, comprising the following steps:

[0009] Step 1: Preparation of the basic solution. Add Tween 20 at 10 - 30% w / w and Tween 80 at 5 - 20% w / w in proportion to 50 - 70% w / w deionized water. Mix them with a magnetic stirrer at 800 rpm for 30 minutes at 25°C, and control the dielectric constant of the mixed solution to reach the range of 40 - 60 at a frequency of 1 kHz;

[0010] Step 2: Conductivity adjustment. Add 1 - 10% w / w anionic surfactant, and monitor it in real time with a conductivity meter. Adjust the solution conductivity to the range of 0.5 - 2.5 S / m at 25°C, and control the stirring speed at 500 rpm;

[0011] Step 3: Bandwidth optimization. Introduce 0.1% - 5% w / w soy oil amide as an emulsifier, and ultrasonically treat it in a 40°C water bath for 15 minutes with a power of 100 W and a frequency of 40 kHz, so that the fluctuation amplitude of the dielectric constant of the solution is less than ±5% in the frequency range of 1 - 100 MHz;

[0012] Step 4: pH value regulation. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate at 0.5 - 3% w / w, molar ratio 1:1), and monitor it with a pH meter to adjust the pH value of the solution to the range of 5.5 - 6.5. Keep the solution temperature at 25 ± 2°C during the adjustment process.

[0013] The third aspect of the present invention provides an application of the tissue fluid based on an oil-based extender emulsifier described in the first aspect in the electromagnetic wave specific absorption rate test of mobile communication devices.

[0014] As a further technical solution of the present invention: The tissue fluid is used to support the electromagnetic wave specific absorption rate test of mobile communication devices for 5G NR Sub-6GHz.

[0015] As a further technical solution of the present invention: The tissue fluid is used for the electromagnetic wave specific absorption rate test of mobile communication devices in the frequency range of 600 MHz to 10000 MHz.

[0016] In summary, the present invention includes at least one of the following beneficial technical effects:

[0017] The present invention discloses a tissue fluid based on an oil-based extended emulsifier, a preparation method and an application. The manufacturing technology of this tissue fluid uses oil derivatives to replace traditional mineral oil in terms of working principle, and its dielectric properties are used to achieve broadband coverage. An anionic surfactant with specific conductive properties (such as sodium lauryl polyether sulfate) is introduced as a conductivity regulator, and the dielectric constant of water has a greater impact on frequency changes. The synergistic effect of these three mechanisms ultimately forms a broadband analog tissue fluid system with excellent frequency response characteristics, thereby achieving broadband operability. The finally obtained tissue fluid can cover a frequency range of 600 MHz to 10,000 MHz, greatly improving the test efficiency and reducing the number of times of tissue fluid replacement. Detailed implementation manners

[0018] 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; it is obvious that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative work shall fall within the protection scope of the present application.

[0019] Example 1:

[0020] A preparation method of a tissue fluid based on an oil-based extended emulsifier, comprising the following steps:

[0021] Step 1: Preparation of the basic solution. Add 10% w / w of Tween 20 and 20% w / w of Tween 80 to 60% w / w of deionized water in proportion, and mix them for 30 minutes at 800 rpm by a magnetic stirrer at 25 °C, and control the dielectric constant of the mixed solution to reach the range of 40 - 60 at a frequency of 1 kHz;

[0022] Step 2: Conductivity adjustment. Add 5% w / w of an anionic surfactant, and monitor it in real time with a conductivity meter. Adjust the conductivity of the solution to the range of 0.5 - 2.5 S / m at 25 °C, and control the stirring speed at 500 rpm;

[0023] Step 3: Bandwidth optimization. Introduce 5% w / w of soy oil amide as an emulsifier, and ultrasonically treat it in a 40 °C water bath for 15 minutes, with a power of 100 W and a frequency of 40 kHz, so that the fluctuation range of the dielectric constant of the solution within the frequency range of 1 - 100 MHz is less than ±5%;

[0024] Step 4: pH value regulation. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing a mixture of 0.5 - 3% w / w of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1), and monitor it with a pH meter to adjust the pH value of the solution to the range of 5.5 - 6.5, and keep the solution temperature at 25 ± 2 °C during the adjustment process.

[0025] Put the above-mentioned tissue fluid into a container, and use the DAK medium probe kit of SPEAG and a conductivity meter to measure the relative permittivity ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz. After 6 months, measure the relative permittivity ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz again. The measurement results are shown in Table 1:

[0026] Table 1

[0027]

[0028] Example 2:

[0029] A preparation method of tissue fluid based on an oil-based extender emulsifier, comprising the following steps:

[0030] Step 1: Preparation of the basic solution. Add 20% w / w of Tween 20 and 5% w / w of Tween 80 to 69.9% w / w of deionized water in proportion, and mix them for 30 minutes at 800 rpm by a magnetic stirrer at 25 °C, and control the dielectric constant of the mixed solution to reach the range of 40 - 60 at a frequency of 1 kHz;

[0031] Step 2: Conductivity adjustment. Add 5% w / w of an anionic surfactant, and monitor it in real time with a conductivity meter. Adjust the conductivity of the solution to the range of 0.5 - 2.5 S / m at 25 °C, and control the stirring speed at 500 rpm;

[0032] Step 3: Bandwidth optimization. Introduce 0.1% w / w of soyamide as an emulsifier, and ultrasonically treat it in a 40 °C water bath for 15 minutes, with a power of 100 W and a frequency of 40 kHz, so that the fluctuation range of the dielectric constant of the solution is less than ±5% in the frequency range of 1 - 100 MHz;

[0033] Step 4: pH value regulation. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing a mixture of 0.5 - 3% w / w of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1), and monitor it with a pH meter to adjust the pH value of the solution to the range of 5.5 - 6.5, and keep the solution temperature at 25 ± 2 °C during the adjustment process.

[0034] Put the above-mentioned tissue fluid into a container, and use the DAK medium probe kit of SPEAG and a conductivity meter to measure the relative permittivity ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz. After 6 months, measure the relative permittivity ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz again. The measurement results are shown in Table 2:

[0035] Table 2

[0036]

[0037] Example 3:

[0038] A preparation method of tissue fluid based on an oil-based extended emulsifier, comprising the following steps:

[0039] Step 1: Preparation of the basic solution. Add 30% w / w of Tween 20 and 13% w / w of Tween 80 to 52% w / w of deionized water in proportion, and mix them for 30 minutes at 800 rpm by a magnetic stirrer under the condition of 25 °C, and control the dielectric constant of the mixed solution to reach the range of 40 - 60 at a frequency of 1 kHz;

[0040] Step 2: Conductivity adjustment. Add 3% w / w of an anionic surfactant, and monitor it in real time with a conductivity meter. Adjust the solution conductivity to the range of 0.5 - 2.5 S / m at 25 °C, and control the stirring speed at 500 rpm;

[0041] Step 3: Bandwidth optimization. Introduce 2% w / w of soyamide as an emulsifier, and ultrasonically treat it in a 40 °C water bath for 15 minutes, with a power of 100 W and a frequency of 40 kHz, so that the fluctuation range of the dielectric constant of the solution is less than ±5% in the frequency range of 1 - 100 MHz;

[0042] Step 4: pH value regulation. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing a mixture of 0.5 - 3% w / w of disodium hydrogen phosphate and potassium dihydrogen phosphate, with a molar ratio of 1:1), and monitor and adjust the pH value of the solution to the range of 5.5 - 6.5 through a pH meter. Keep the solution temperature at 25 ± 2 °C during the adjustment process.

[0043] Put the above-mentioned tissue fluid into a container, and measure the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz respectively by using the DAK medium probe kit of SPEAG and a conductivity meter. After 6 months, measure the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz again. The measurement results are shown in Table 3:

[0044] Table 3

[0045]

[0046] Example 4:

[0047] A preparation method of tissue fluid based on an oil-based extended emulsifier, comprising the following steps:

[0048] Step 1: Preparation of the basic solution. Add Tween 20 at 10% w / w and Tween 80 at 20% w / w to 55% w / w deionized water in proportion. Mix them for 30 minutes at 800 rpm using a magnetic stirrer at 25°C, and control the dielectric constant of the mixed solution to reach the range of 40 - 60 at a frequency of 1 kHz;

[0049] Step 2: Conductivity adjustment. Add an anionic surfactant at 10% w / w and monitor it in real-time with a conductivity meter. Adjust the solution conductivity to the range of 0.5 - 2.5 S / m at 25°C, and control the stirring speed at 500 rpm;

[0050] Step 3: Bandwidth optimization. Introduce soybean oil amide at 5% w / w as an emulsifier and ultrasonically treat it in a 40°C water bath for 15 minutes with a power of 100 W and a frequency of 40 kHz, so that the fluctuation amplitude of the dielectric constant of the solution is less than ±5% in the frequency range of 1 - 100 MHz;

[0051] Step 4: pH value regulation. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate at 0.5 - 3% w / w, with a molar ratio of 1:1), and monitor it with a pH meter to adjust the pH value of the solution to the range of 5.5 - 6.5, and keep the solution temperature at 25 ± 2°C during the adjustment process.

[0052] Put the above tissue fluid into a container, and measure the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz respectively using the DAK medium probe kit of SPEAG and a conductivity meter. After 6 months, measure the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz again. The measurement results are shown in Table 4:

[0053] Table 4

[0054]

[0055] Example 5:

[0056] A preparation method of tissue fluid based on an oil-based extender emulsifier, comprising the following steps:

[0057] Step 1: Preparation of the basic solution. Add Tween 20 at 18% w / w and Tween 80 at 12% w / w to 64% w / w deionized water in proportion. Mix them for 30 minutes at 800 rpm using a magnetic stirrer at 25°C, and control the dielectric constant of the mixed solution to reach the range of 40 - 60 at a frequency of 1 kHz;

[0058] Step 2: Conductivity adjustment. Add 1% w / w anionic surfactant and monitor it in real time with a conductivity meter. Adjust the solution conductivity to the range of 0.5 - 2.5 S / m at 25 °C, and control the stirring speed at 500 rpm.

[0059] Step 3: Bandwidth optimization. Introduce 5% w / w soyamide as an emulsifier and ultrasonically treat it 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 amplitude of the solution is less than ±5% in the frequency range of 1 - 100 MHz.

[0060] Step 4: pH value regulation. When the solution pH value is between 4 - 7, add a phosphate buffer (containing a mixture of 0.5 - 3% w / w disodium hydrogen phosphate and potassium dihydrogen phosphate with a molar ratio of 1:1), and monitor and adjust the solution pH value to the range of 5.5 - 6.5 with a pH meter, and keep the solution temperature at 25 ± 2 °C during the adjustment process.

[0061] Put the above-mentioned tissue fluid into a container, and measure the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz respectively using the DAK medium probe kit of SPEAG and a conductivity meter. After 6 months, measure the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz again. The measurement results are shown in Table 5:

[0062] Table 5

[0063]

[0064] Example 6:

[0065] A preparation method of tissue fluid based on an oil-based extender emulsifier, comprising the following steps:

[0066] Step 1: Preparation of the basic solution. Add 22% w / w Tween 20 and 20% w / w Tween 80 to 50% w / w deionized water in proportion, and mix them with a magnetic stirrer at 800 rpm for 30 minutes at 25 °C, and control the dielectric constant of the mixed solution to reach the range of 40 - 60 at 1 kHz frequency.

[0067] Step 2: Conductivity adjustment. Add 4% w / w anionic surfactant and monitor it in real time with a conductivity meter. Adjust the solution conductivity to the range of 0.5 - 2.5 S / m at 25 °C, and control the stirring speed at 500 rpm.

[0068] Step 3: Bandwidth optimization. Introduce 4% w / w soyamide as an emulsifier, and ultrasonically treat it 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 amplitude of the solution is less than ±5% in the frequency range of 1 - 100 MHz;

[0069] Step 4: pH value regulation. When the solution pH value is between 4 - 7, add a phosphate buffer (containing a mixture of 0.5 - 3% w / w disodium hydrogen phosphate and potassium dihydrogen phosphate with a molar ratio of 1:1), and adjust the solution pH value to the range of 5.5 - 6.5 through monitoring with a pH meter, and keep the solution temperature at 25 ± 2°C during the adjustment process.

[0070] Put the above-mentioned tissue fluid into a container, and measure the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz respectively using the DAK medium probe kit of SPEAG and a conductivity meter. After 6 months, measure the relative dielectric constant ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz again. The measurement results are shown in Table VI:

[0071] Table VI

[0072]

[0073] Example VII:

[0074] A preparation method of tissue fluid based on an oil-based extender emulsifier, comprising the following steps:

[0075] Step 1: Preparation of the basic solution. Add 10% w / w Tween 20 and 5% w / w Tween 80 to 70% w / w deionized water in proportion, and mix them with a magnetic stirrer at 800 rpm for 30 minutes at 25°C, and control the dielectric constant of the mixed solution to reach the range of 40 - 60 at 1 kHz frequency;

[0076] Step 2: Conductivity adjustment. Add 10% w / w anionic surfactant, and monitor it in real time with a conductivity meter. Adjust the solution conductivity to the range of 0.5 - 2.5 S / m at 25°C, and control the stirring speed at 500 rpm;

[0077] Step 3: Bandwidth optimization. Introduce 5% w / w soyamide as an emulsifier, and ultrasonically treat it 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 amplitude of the solution is less than ±5% in the frequency range of 1 - 100 MHz;

[0078] Step 4: pH value regulation. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate at 0.5 - 3% w / w, molar ratio 1:1), and adjust the pH value of the solution to the range of 5.5 - 6.5 by monitoring with a pH meter. Keep the solution temperature at 25 ± 2 °C during the adjustment process.

[0079] Put the above-mentioned tissue fluid into a container, and measure the relative permittivity ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz respectively using the DAK medium probe kit of SPEAG and a conductivity meter. After 6 months, measure the relative permittivity ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz again. The measurement results are shown in Table VII:

[0080] Table VII

[0081]

[0082] Example VIII:

[0083] A preparation method of tissue fluid based on an oil-based extender emulsifier, comprising the following steps:

[0084] Step 1: Preparation of the basic solution. Add 16% w / w of Tween 20 and 13% w / w of Tween 80 to 62% w / w of deionized water in proportion, and mix them for 30 minutes at 800 rpm with a magnetic stirrer under the condition of 25 °C, and control the relative permittivity of the mixed solution to reach the range of 40 - 60 at a frequency of 1 kHz;

[0085] Step 2: Conductivity adjustment. Add 5% w / w of an anionic surfactant, and adjust the conductivity of the solution to the range of 0.5 - 2.5 S / m in real-time monitoring with a conductivity meter under the condition of 25 °C, and control the stirring speed at 500 rpm;

[0086] Step 3: Bandwidth optimization. Introduce 4% w / w of soyamide as an emulsifier, and ultrasonically treat it in a 40 °C water bath for 15 minutes, with a power of 100 W and a frequency of 40 kHz, so that the fluctuation range of the relative permittivity of the solution in the frequency range of 1 - 100 MHz is less than ±5%;

[0087] Step 4: pH value regulation. When the pH value of the solution is between 4 and 7, add a phosphate buffer (containing a mixture of disodium hydrogen phosphate and potassium dihydrogen phosphate at 0.5 - 3% w / w, molar ratio 1:1), and adjust the pH value of the solution to the range of 5.5 - 6.5 by monitoring with a pH meter. Keep the solution temperature at 25 ± 2 °C during the adjustment process.

[0088] Put the above-mentioned tissue fluid into a container, and use the DAK medium probe kit of SPEAG and a conductivity meter to measure the relative permittivity ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz. After 6 months, measure the relative permittivity ε and conductivity σ of the tissue fluid in the frequency range of 600 MHz to 10,000 MHz again. The measurement results are shown in Table VIII:

[0089] Table VIII

[0090]

[0091] As shown in Tables I to VIII, the tissue fluid provided by the present invention meets the following requirements:

[0092] 1. Dielectric constant test: Test the stability of the dielectric constant in the frequency band of 600 MHz to 10,000 MHz, showing a low change rate of the tissue fluid in the wide frequency band.

[0093] 2. Stability test: Long-term stability test to confirm that the liquid phase stability can be maintained for at least 6 months.

[0094] 3. Conductivity test: Test the conductivity at different frequency bands to ensure that the tissue fluid can still maintain a low conductivity in the high-frequency band to meet various test requirements.

[0095] In the technical solution of the present invention, the main components used include Tween 20, Tween 80, sodium lauryl polyether sulfate, soyamide, deionized water, etc.

[0096] Soyamide: Plays an important role in the oil phase. Due to its low conductivity and flat dielectric constant change, it helps to maintain consistent dielectric properties in a relatively wide frequency range.

[0097] Surfactants (Tween 80, Tween 20): Rapidly reduce the dielectric constant of the solution and have good solubility. Water is a high-dielectric material, and it is an efficient way to reduce the dielectric constant through non-ionic surfactants.

[0098] Deionized water: As the main component of the water phase, by appropriate mixing ratios, control the change of the dielectric constant of water to achieve a wide operating range.

[0099] The present invention proposes an innovative method that avoids the traditional way of directly using oil, water, and emulsifiers, and instead uses substances with water-soluble characteristics and derived from oils. We found that such substances have a relatively flat dielectric constant difference curve. Therefore, in this application, soyamide is used without utilizing its thickening property. Soyamide is a versatile surfactant and can also be used as a thickener in daily chemical products. However, the solubility of such substances is usually low and cannot significantly reduce the dielectric constant of water. Therefore, we paired it with 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 liquid and its stability is difficult to control.

[0100] In terms of conductivity regulation, this application uses sodium lauryl ether sulfate (also known as coconut oil foaming agent in some regions because its ingredients can be extracted from coconuts). The conductivity of zwitterionic surfactants has a large gap from the target value and lacks an effective regulation mechanism. Therefore, this application selects common anionic surfactants as the regulation means, which is the core point of the present invention.

[0101] The regulation mechanism of this application is as follows:

[0102] The base is water, and its dielectric constant is about 80.

[0103] Coarse adjustment is carried out using non-ionic surfactants to reduce the dielectric constant to the range of 40 - 50. At this time, the difference in dielectric constant at the operating frequency is about ±15%.

[0104] The dielectric constant difference is further adjusted to ±10% through soyamide.

[0105] Finally, an anionic surfactant is added to adjust the conductivity to the target value.

[0106] 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.

[0107] The implementation principle of the present invention is as follows: The present invention discloses a tissue fluid based on an oil-based extender emulsifier, a preparation method and an application. This tissue fluid manufacturing technology achieves broadband coverage through the dielectric properties of the emulsifier material of oil derivatives. The flat dielectric constant change and low conductivity of soyamide make it an ideal broadband material, while the dielectric constant of water is more affected by frequency changes. A non-ionic surfactant is used for rough adjustment of the dielectric constant, and soyamide is used for fine adjustment, thereby achieving broadband operability. Since all the selected materials can form stable solutions in water, the stability of the human tissue simulation fluid is greatly improved. The finally obtained tissue fluid can cover a frequency range of 600 MHz to 10,000 MHz, greatly improving the test efficiency and reducing the number of times of tissue fluid replacement.

[0108] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. An oil-based tissue fluid emulsifier, 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%; The anionic surfactant is sodium laureth sulfate; The method for preparing the tissue fluid based on the oil-extending emulsifier comprises the following steps: Step 1: Preparation of a basic solution: 16% by weight of Tween 20 and 13% by weight of Tween 80 were added to 62% by weight of 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% by weight 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 4% by mass of 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.

2. Application of the tissue fluid based on oil-based emulsifier as claimed in claim 1 in electromagnetic wave energy specific absorption rate testing of mobile communication equipment.

3. The use of an oil-based emulsifier-based tissue fluid in electromagnetic wave energy specific absorption rate testing of mobile communication equipment according to claim 2, 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.

4. 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 2, 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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