A high internal phase Pickering emulsion and its preparation method

Abstract

The present invention discloses a high internal phase Pickering emulsion and a preparation method thereof, relating to the technical field of emulsion preparation; the preparation method of the emulsion comprises the following steps: (1) soaking microcrystalline cellulose in deionized water for swelling, adding sodium periodate and sodium chloride under mechanical stirring conditions, reacting at room temperature, and washing to obtain oxidized microcrystalline cellulose OMCC; (2) homogenizing the oxidized microcrystalline cellulose in deionized water, adding sodium cyanoborohydride under mechanical stirring conditions, reacting in the dark at room temperature, washing and centrifuging to obtain colloidal redox microcrystalline cellulose RMCC; (3) diluting the colloidal redox microcrystalline cellulose with water to form a suspension, and using it as the aqueous phase, then mixing it with the oil phase, and homogenizing and emulsifying to obtain a high internal phase Pickering emulsion. The present invention effectively solves the problems of instability of high internal phase Pickering emulsion and large dosage of particles in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of emulsion preparation, and particularly relates to a high internal phase Pickering emulsion and a preparation method thereof. Background Art

[0002] High internal phase emulsions (HIPEs) are usually referred to as high-concentration emulsions or gel emulsions, in which the volume fraction of the dispersed phase exceeds 74%, the droplets are closely packed, and the stability is very high. In recent years, due to their potential application value, they have attracted much attention and research interest in the fields of food industry, medicine, cosmetics, materials science, etc. Traditional HIPEs need to use a large amount of low-molecular-weight surfactants for stabilization, but the ability of surfactants to reduce the interfacial tension is limited and weak, and the emulsion is prone to droplet aggregation or phase separation. Another method is to use solid colloidal particles instead of small-molecule surfactants. These particles can irreversibly adsorb at the oil-water interface and stabilize the emulsion through the Pickering mechanism, which is also called high internal phase Pickering emulsion (HIPPE). Compared with traditional emulsions, HIPPE without using surfactants has advantages such as high stability and environmental friendliness, and has a broader application prospect. Currently, commonly used solid particle stabilizers include inorganic colloidal particles such as silica and titanium dioxide, and organic colloidal particles such as starch nanocrystals, zein particles, gelatin nanoparticles, and cellulose nanocrystals.

[0003] Cellulose materials are the most abundant natural and renewable resources, and their advantages of being non-toxic, harmless, and low-cost have promoted their wide application. Microcrystalline cellulose is a cellulose derivative of natural origin, which is composed of a large number of glucose units connected by β-1,4-glycosidic bonds. It has a large number of hydroxyl groups (-OH) on the surface, and has excellent biocompatibility, environmental friendliness, and adjustable surface properties. However, the surface of microcrystalline cellulose is too hydrophilic, and its adsorption ability to the oil-water interface is limited, and the effect used in Pickering emulsions is not very ideal. Many studies have found that modifying or modifying it can change the surface hydrophilicity and charge properties, thereby enhancing its interaction and stability with oil droplets, and being used to prepare more stable Pickering emulsions. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a high internal phase Pickering emulsion and a preparation method thereof, effectively solving the problems of instability and large particle dosage of high internal phase Pickering emulsions in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: providing a preparation method of a high internal phase Pickering emulsion, comprising the following steps:

[0006] (1) Soak and swell microcrystalline cellulose with deionized water, add sodium periodate and sodium chloride under mechanical stirring, react at room temperature, and wash to obtain oxidized microcrystalline cellulose OMCC;

[0007] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in deionized water, add sodium cyanoborohydride under mechanical stirring, react in the dark at room temperature, wash and centrifuge to obtain colloidal redox microcrystalline cellulose RMCC;

[0008] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension, and use it as the water phase, then mix it with the oil phase and homogenize and emulsify to obtain a high internal phase Pickering emulsion.

[0009] Further, in step (1), the mass-volume ratio of microcrystalline cellulose, sodium periodate, sodium chloride and deionized water is 6 - 8 g: 9 - 10 g: 27 - 28 g: 700 mL.

[0010] Further, in step (1), the mass-volume ratio of microcrystalline cellulose, sodium periodate, sodium chloride and deionized water is 7.0 g: 9.24 g: 27.09 g: 700 mL.

[0011] Further, in step (1), soak and swell for 24 h, carry out the oxidation reaction at 21 - 27 °C for 72 h, and wash with deionized water 2 - 4 times.

[0012] Further, in step (2), the mass-volume ratio of sodium cyanoborohydride and deionized water is 3 - 4 g: 400 mL.

[0013] Further, in step (2), the mass-volume ratio of sodium cyanoborohydride and deionized water is 3.5 g: 400 mL.

[0014] Further, in step (2), wash with deionized water 2 - 4 times, centrifuge at 4000 rpm for 2 - 4 min, and remove the supernatant.

[0015] Further, in step (3), in the suspension, the volume fraction of colloidal redox microcrystalline cellulose is 10 - 30 vt%, and the proportion of the oil phase is 72.5 - 85 vt%.

[0016] Further, in step (3), the oil phase is at least one of white oil, isooctane and liquid paraffin.

[0017] Further, in step (3), homogenize and emulsify at 10000 - 12000 rpm for 15 - 30 s.

[0018] The present invention also provides a high internal phase Pickering emulsion prepared by the preparation method of the above-mentioned high internal phase Pickering emulsion.

[0019] The present invention has the following beneficial effects:

[0020] 1. There are a large number of hydroxyl groups on the surface of microcrystalline cellulose, showing a certain hydrophilicity. In the present invention, the ring structure of microcrystalline cellulose is opened by a redox reaction to generate hydroxyl groups, changing its surface properties and correspondingly changing its emulsifying properties.

[0021] 2. The high internal phase Pickering emulsion provided by the present invention uses a small amount of colloidal redox microcrystalline cellulose as an emulsifier, avoiding the use of surfactants, which is safe and environmentally friendly. Moreover, the colloidal redox microcrystalline cellulose can stably adsorb on the oil-water interface to form a stable interfacial layer, effectively preventing the coalescence of droplets, and the emulsion has high stability.

[0022] 3. The preparation process of the method involved in the present invention is simple, the dosage of colloidal redox microcrystalline cellulose is small, the stable emulsion has a high oil-water ratio and stable properties. Description of the Drawings

[0023] Figure 1 It is a scanning electron microscope photograph of the colloidal redox microcrystalline cellulose obtained in Example 1; (a) is a scanning electron microscope image magnified 500 times; (b) is a scanning electron microscope image magnified 1000 times; (c) is a scanning electron microscope image magnified 3000 times;

[0024] Figure 2 It is a Raman spectrum diagram of microcrystalline cellulose, oxidized microcrystalline cellulose and colloidal redox microcrystalline cellulose in Example 1;

[0025] Figure 3 It is an appearance diagram of the colloidal redox microcrystalline cellulose suspension in Examples 1-5; among them, 10%, 15%, 20%, 25% and 30% correspond to Example 2, Example 3, Example 1, Example 4 and Example 5 respectively;

[0026] Figure 4 It is an appearance diagram of the high internal phase Pickering emulsion obtained in Examples 1-5; (a) is the appearance diagram of the emulsion when it is prepared; (b) is the inverted appearance diagram of the emulsion when it is prepared; (c) is the appearance diagram of the emulsion after 24 h; (d) is the inverted appearance diagram of the emulsion after 24 h; among them, 10%, 15%, 20%, 25% and 30% correspond to Example 2, Example 3, Example 1, Example 4 and Example 5 respectively;

[0027] Figure 5Appearance diagrams of the high internal phase Pickering emulsions obtained in Example 1 and Examples 6 - 10; (a) Diagram shows the appearance of the emulsion when placed upright; (b) Diagram shows the appearance of the emulsion when inverted; among them, 72.5%, 75%, 77.5%, 80%, 82.5% and 85% correspond to Example 6, Example 1, Example 7, Example 8, Example 9 and Example 10 respectively. Detailed implementation methods

[0028] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention. For those not specified in the examples, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. For reagents or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0029] Example 1:

[0030] A high internal phase Pickering emulsion, the preparation method of which comprises the following steps:

[0031] (1) Soak 7.0 g of microcrystalline cellulose in 700 mL of deionized water for 24 h to swell, add 9.24 g of sodium periodate and 27.09 g of sodium chloride under mechanical stirring conditions, carry out an oxidation reaction at 25 °C for 72 h, wash with deionized water 3 times, collect the suspension to obtain oxidized microcrystalline cellulose OMCC;

[0032] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in 400 mL of deionized water, add 3.5 g of sodium cyanoborohydride under mechanical stirring conditions, carry out a light - avoiding reaction at 25 °C, wash with deionized water 3 times, centrifuge at 4000 rpm for 3 min, remove the supernatant to obtain colloidal redox microcrystalline cellulose RMCC;

[0033] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension (20 vt%), and use it as the aqueous phase, then mix it with the oil phase (white oil) at a volume ratio of 1:3 to make the volume fraction of the oil phase 75%, and homogenize and emulsify at 10000 rpm for 20 s to obtain a high internal phase Pickering emulsion.

[0034] Example 2:

[0035] A high internal phase Pickering emulsion, the preparation method of which comprises the following steps:

[0036] (1) Soak 7.0 g of microcrystalline cellulose in 700 mL of deionized water for 24 h to swell it. Add 9.24 g of sodium periodate and 27.09 g of sodium chloride under mechanical stirring conditions, and carry out an oxidation reaction at 25 °C for 72 h. Wash it three times with deionized water, collect the suspension, and obtain oxidized microcrystalline cellulose OMCC;

[0037] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in 400 mL of deionized water. Add 3.5 g of sodium cyanoborohydride under mechanical stirring conditions, and carry out a reaction in the dark at 25 °C. Wash it three times with deionized water, centrifuge at 4000 rpm for 3 min, and remove the supernatant to obtain colloidal redox microcrystalline cellulose RMCC;

[0038] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension (10 vt%), and use it as the aqueous phase. Then mix it with the oil phase (white oil) at a volume ratio of 1:3, and homogenize and emulsify it at 10000 rpm for 20 s to obtain a high internal phase Pickering emulsion.

[0039] Example 3:

[0040] A high internal phase Pickering emulsion, and its preparation method includes the following steps:

[0041] (1) Soak 7.0 g of microcrystalline cellulose in 700 mL of deionized water for 24 h to swell it. Add 9.24 g of sodium periodate and 27.09 g of sodium chloride under mechanical stirring conditions, and carry out an oxidation reaction at 25 °C for 72 h. Wash it three times with deionized water, collect the suspension, and obtain oxidized microcrystalline cellulose OMCC;

[0042] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in 400 mL of deionized water. Add 3.5 g of sodium cyanoborohydride under mechanical stirring conditions, and carry out a reaction in the dark at 25 °C. Wash it three times with deionized water, centrifuge at 4000 rpm for 3 min, and remove the supernatant to obtain colloidal redox microcrystalline cellulose RMCC;

[0043] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension (15 vt%), and use it as the aqueous phase. Then mix it with the oil phase (white oil) at a volume ratio of 1:3, and homogenize and emulsify it at 10000 rpm for 20 s to obtain a high internal phase Pickering emulsion.

[0044] Example 4:

[0045] A high internal phase Pickering emulsion, and its preparation method includes the following steps:

[0046] (1) Soak 7.0 g of microcrystalline cellulose in 700 mL of deionized water for 24 h to swell it. Under mechanical stirring conditions, add 9.24 g of sodium periodate and 27.09 g of sodium chloride, and carry out an oxidation reaction at 25 °C for 72 h. Wash it 3 times with deionized water, collect the suspension, and obtain oxidized microcrystalline cellulose OMCC;

[0047] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in 400 mL of deionized water. Under mechanical stirring conditions, add 3.5 g of sodium cyanoborohydride, and carry out a reaction in the dark at 25 °C. Wash it 3 times with deionized water, centrifuge at 4000 rpm for 3 min, and remove the supernatant to obtain colloidal redox microcrystalline cellulose RMCC;

[0048] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension (25 vt%), and use it as the aqueous phase. Then mix it with the oil phase (white oil) at a volume ratio of 1:3, and homogenize and emulsify it at 10000 rpm for 20 s to obtain a high internal phase Pickering emulsion.

[0049] Example 5:

[0050] A high internal phase Pickering emulsion, and its preparation method includes the following steps:

[0051] (1) Soak 7.0 g of microcrystalline cellulose in 700 mL of deionized water for 24 h to swell it. Under mechanical stirring conditions, add 9.24 g of sodium periodate and 27.09 g of sodium chloride, and carry out an oxidation reaction at 25 °C for 72 h. Wash it 3 times with deionized water, collect the suspension, and obtain oxidized microcrystalline cellulose OMCC;

[0052] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in 400 mL of deionized water. Under mechanical stirring conditions, add 3.5 g of sodium cyanoborohydride, and carry out a reaction in the dark at 25 °C. Wash it 3 times with deionized water, centrifuge at 4000 rpm for 3 min, and remove the supernatant to obtain colloidal redox microcrystalline cellulose RMCC;

[0053] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension (30 vt%), and use it as the aqueous phase. Then mix it with the oil phase (white oil) at a volume ratio of 1:3, and homogenize and emulsify it at 10000 rpm for 20 s to obtain a high internal phase Pickering emulsion.

[0054] Example 6:

[0055] A high internal phase Pickering emulsion, and its preparation method includes the following steps:

[0056] (1) Soak 7.0 g of microcrystalline cellulose in 700 mL of deionized water for 24 h to swell. Add 9.24 g of sodium periodate and 27.09 g of sodium chloride under mechanical stirring conditions, and carry out an oxidation reaction at 25 °C for 72 h. Wash with deionized water three times, collect the suspension, and obtain oxidized microcrystalline cellulose OMCC;

[0057] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in 400 mL of deionized water. Add 3.5 g of sodium cyanoborohydride under mechanical stirring conditions, and carry out a reaction in the dark at 25 °C. Wash with deionized water three times, centrifuge at 4000 rpm for 3 min, and remove the supernatant to obtain colloidal redox microcrystalline cellulose RMCC;

[0058] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension, and use it as the aqueous phase. Then mix it with the oil phase (white oil) at a volume ratio of 1.1:2.9, so that the volume fraction of the oil phase is 72.5%. Homogenize and emulsify at 10000 rpm for 20 s to obtain a high internal phase Pickering emulsion.

[0059] Example 7:

[0060] A high internal phase Pickering emulsion, and its preparation method includes the following steps:

[0061] (1) Soak 7.0 g of microcrystalline cellulose in 700 mL of deionized water for 24 h to swell. Add 9.24 g of sodium periodate and 27.09 g of sodium chloride under mechanical stirring conditions, and carry out an oxidation reaction at 25 °C for 72 h. Wash with deionized water three times, collect the suspension, and obtain oxidized microcrystalline cellulose OMCC;

[0062] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in 400 mL of deionized water. Add 3.5 g of sodium cyanoborohydride under mechanical stirring conditions, and carry out a reaction in the dark at 25 °C. Wash with deionized water three times, centrifuge at 4000 rpm for 3 min, and remove the supernatant to obtain colloidal redox microcrystalline cellulose RMCC;

[0063] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension, and use it as the aqueous phase. Then mix it with the oil phase (white oil) at a volume ratio of 0.9:3.1, so that the volume fraction of the oil phase is 77.5%. Homogenize and emulsify at 10000 rpm for 20 s to obtain a high internal phase Pickering emulsion.

[0064] Example 8:

[0065] A high internal phase Pickering emulsion, and its preparation method includes the following steps:

[0066] (1) Soak 7.0 g of microcrystalline cellulose in 700 mL of deionized water for 24 h to swell it. Add 9.24 g of sodium periodate and 27.09 g of sodium chloride under mechanical stirring conditions, and carry out an oxidation reaction at 25 °C for 72 h. Wash it 3 times with deionized water, collect the suspension, and obtain oxidized microcrystalline cellulose OMCC;

[0067] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in 400 mL of deionized water. Add 3.5 g of sodium cyanoborohydride under mechanical stirring conditions, carry out a reaction in the dark at 25 °C, wash it 3 times with deionized water, centrifuge it at 4000 rpm for 3 min, and remove the supernatant to obtain colloidal redox microcrystalline cellulose RMCC;

[0068] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension, and use it as the aqueous phase. Then mix it with the oil phase (white oil) at a volume ratio of 0.8:3.2 to make the volume fraction of the oil phase 80%. Homogenize and emulsify it at 10000 rpm for 20 s to obtain a high internal phase Pickering emulsion.

[0069] Example 9:

[0070] A high internal phase Pickering emulsion, and its preparation method includes the following steps:

[0071] (1) Soak 7.0 g of microcrystalline cellulose in 700 mL of deionized water for 24 h to swell it. Add 9.24 g of sodium periodate and 27.09 g of sodium chloride under mechanical stirring conditions, and carry out an oxidation reaction at 25 °C for 72 h. Wash it 3 times with deionized water, collect the suspension, and obtain oxidized microcrystalline cellulose OMCC;

[0072] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in 400 mL of deionized water. Add 3.5 g of sodium cyanoborohydride under mechanical stirring conditions, carry out a reaction in the dark at 25 °C, wash it 3 times with deionized water, centrifuge it at 4000 rpm for 3 min, and remove the supernatant to obtain colloidal redox microcrystalline cellulose RMCC;

[0073] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension, and use it as the aqueous phase. Then mix it with the oil phase (white oil) at a volume ratio of 0.7:3.3 to make the volume fraction of the oil phase 82.5%. Homogenize and emulsify it at 10000 rpm for 20 s to obtain a high internal phase Pickering emulsion.

[0074] Example 10:

[0075] A high internal phase Pickering emulsion, and its preparation method includes the following steps:

[0076] (1) Soak 7.0 g of microcrystalline cellulose in 700 mL of deionized water for 24 h to swell it. Add 9.24 g of sodium periodate and 27.09 g of sodium chloride under mechanical stirring conditions, and carry out an oxidation reaction at 25 °C for 72 h. Wash it three times with deionized water, collect the suspension to obtain oxidized microcrystalline cellulose OMCC;

[0077] (2) Homogenize the oxidized microcrystalline cellulose obtained in step (1) in 400 mL of deionized water. Add 3.5 g of sodium cyanoborohydride under mechanical stirring conditions, and carry out a reaction in the dark at 25 °C. Wash it three times with deionized water, and centrifuge it at 4000 rpm for 3 min to remove the supernatant to obtain colloidal redox microcrystalline cellulose RMCC;

[0078] (3) Dilute the colloidal redox microcrystalline cellulose obtained in step (2) with water to form a suspension, and use it as the aqueous phase. Then mix it with the oil phase (white oil) at a volume ratio of 0.6:3.4 to make the volume fraction of the oil phase 85%. Homogenize and emulsify it at 10000 rpm for 20 s to obtain a high internal phase Pickering emulsion.

[0079] Test example:

[0080] 1. Obtain the scanning electron microscope photos of the colloidal redox microcrystalline cellulose obtained in Example 1, as shown in Figure 1 shown; and obtain the Raman spectra of the microcrystalline cellulose MCC, oxidized microcrystalline cellulose OMCC, and colloidal redox microcrystalline cellulose RMCC of Example 1, as shown in Figure 2 shown.

[0081] It can be seen from Figure 1 that the colloidal redox microcrystalline cellulose is in the form of filamentous sheet aggregates.

[0082] It can be seen from Figure 2 that there are obvious differences in the spectra of microcrystalline cellulose before and after the redox reaction, and its structure has changed.

[0083] 2. The appearance diagrams of the suspensions (colloidal redox microcrystalline cellulose) obtained in step (3) of Examples 1 - 5 are as shown in Figure 3 shown; the appearance diagrams of the high internal phase Pickering emulsions obtained in Examples 1 - 5 are as shown in Figure 4 shown.

[0084] It can be seen from Figure 3 that as the volume fraction of the colloidal redox microcrystalline cellulose increases, the color of the suspension becomes whiter.

[0085] It can be seen from Figure 4It can be seen that the emulsions prepared in Example 2 and Example 3 are unstable after 24 h, and water precipitates, indicating that the concentration of colloidal redox microcrystalline cellulose particles is too low to stabilize the emulsion. If an emulsion needs to be stabilized, the volume fraction of RMCC should be greater than 15%.

[0086] 3. The appearance diagrams of the high internal phase Pickering emulsions obtained in Example 1 and Examples 6-10 are as Figure 5 shown.

[0087] From Figure 5 it can be seen that the emulsions with an oil phase volume fraction in the range of 72.5%-82.5% are very stable. However, at 85%, due to limited particles, more oil phase cannot be carried, and the emulsion effect is poor.

[0088] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for preparing a high internal phase Pickering emulsion, characterized in that: The following steps are involved: (1) soaking microcrystalline cellulose in deionized water to swell it, adding sodium periodate and sodium chloride under mechanical stirring conditions, reacting at room temperature, and washing to obtain oxidized microcrystalline cellulose; (2) homogenizing the oxidized microcrystalline cellulose obtained in step (1) in deionized water, adding sodium cyanoborohydride under mechanical stirring, reacting at room temperature in the dark, washing and centrifuging to obtain colloidal oxidized-reduced microcrystalline cellulose; (3) The colloidal oxidized-reduced microcrystalline cellulose obtained in step (2) is diluted with water to form a suspension, and used as the aqueous phase, which is then mixed with the oil phase, homogenized and emulsified to obtain a high internal phase Pickering emulsion.

2. The method for preparing a high internal phase Pickering emulsion according to claim 1, wherein In step (1), the mass volume ratio of microcrystalline cellulose, sodium periodate, sodium chloride and deionized water is 6-8 g: 9-10 g: 27-28 g: 700 mL.

3. The method for preparing a high internal phase Pickering emulsion according to claim 1 or 2, characterized in that: In step (1), the mass volume ratio of microcrystalline cellulose, sodium periodate, sodium chloride and deionized water is 7.0 g:9.24 g:27.09 g:700 mL.

4. The method for preparing a high internal phase Pickering emulsion according to claim 1, characterized in that: In step (1), the swellable surface is soaked for 24 h, the oxidation reaction is carried out at a temperature of 21-27 °C for 72 h, and the swellable surface is washed with deionized water for 2-4 times.

5. The method for preparing a high internal phase Pickering emulsion according to claim 1, characterized in that: In step (2), the mass volume ratio of sodium cyanoborohydride and deionized water is 3-4 g:400 mL.

6. The method for preparing a high internal phase Pickering emulsion according to claim 1, characterized in that: In step (2), the sample was washed with deionized water for 2-4 times, centrifuged at 4000 rpm for 2-4 min, and the supernatant was removed.

7. The method for preparing a high internal phase Pickering emulsion according to claim 1, characterized in that: In step (3), in the suspension, the volume fraction of colloidal redox microcrystalline cellulose is 10-30 vt%, and the oil phase accounts for 72.5-85 vt%.

8. The method for preparing a high internal phase Pickering emulsion according to claim 1, characterized in that: In step (3), the oil phase is at least one of white oil, isooctane and liquid paraffin.

9. The method for preparing a high internal phase Pickering emulsion according to claim 1, characterized in that: In step (3), homogenize and emulsify at 10000-12000 rpm for 15-30 s.

10. The high internal phase Pickering emulsion prepared by the method for preparing the high internal phase Pickering emulsion according to any one of claims 1 to 9.

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