Organic microcapsule temperature control material based on microfluidic technology and preparation method thereof

Abstract

The invention discloses an organic microcapsule temperature control material based on a microfluidic technology and a preparation method of the organic microcapsule temperature control material. The organic microcapsule temperature control material takes a capsule core as a center, and a silicon dioxide layer uniformly covers the surface of the capsule core by adopting a microfluidic method to serve as a capsule shell; the temperature control material is in a capsule shape, and the particle size of the temperature control material is 10-500 microns. The organic microcapsule temperature control material prepared by a microfluidic technology is uniform in particle size, and the error is within + / -10%; through the temperature control material forming the silicon dioxide / polyurethane composite material shell layer, the material has good stability and mechanical strength, material leakage can be effectively prevented, and meanwhile, the material form and performance cannot be obviously changed after the material is stored for several months at room temperature.

Description

Technical Field

[0001] The invention belongs to the technical field of temperature control materials, and specifically relates to an organic microcapsule temperature control material based on microfluidic technology and a preparation method thereof. Background Art

[0002] Globally, the rapid growth of energy consumption and the instability of energy supply have become an issue that cannot be ignored. With the advancement of industrialization and urbanization, energy demand continues to rise, especially in the fields of cold chain logistics, construction, transportation, and medical health. This growth not only increases the pressure on energy supply, but also brings many challenges; for example, with the rapid development of industries such as food and medicine, the demand for cold chain logistics is growing. Temperature control in low-temperature cold chain logistics is particularly critical to maintain a constant temperature of goods during transportation and reduce cargo loss; in the field of medical health, in the treatment of febrile diseases, the heat in the patient's body is absorbed or released in different ways, and precise temperature control is more conducive to the treatment and recovery of patients.

[0003] Existing temperature control capsule materials have the advantages of high latent heat, stable temperature control performance, and low toxicity and side effects, and are widely used in textiles, medical health, cold chain, aerospace and other fields. However, many phase change materials currently have adverse effects such as leakage and poor effect during actual application. Therefore, the study uses different methods to encapsulate temperature control materials to form stable and safe temperature control capsule materials to expand their application in different fields.

[0004] At present, the main technologies for preparing temperature control materials include in-situ polymerization, interfacial polymerization, emulsification-solvent evaporation, complex coacervation, etc. These methods can prepare temperature control materials with different sizes and shapes by controlling reaction conditions and process parameters. Among them, interfacial polymerization is widely used due to its advantages such as fast reaction speed and low requirements on monomer purity and ratio. However, it still lacks in terms of size uniformity and stability. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an organic microcapsule temperature control material based on microfluidic technology, which solves the problems of poor stability and poor temperature control effect of existing temperature control materials.

[0006] The present invention also aims to provide a method for preparing the above-mentioned organic microcapsule temperature control material.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present invention is implemented as follows: an organic microcapsule temperature control material based on microfluidic technology, the organic microcapsule temperature control material is centered on the capsule core, and a layer of silicon dioxide layer is evenly covered on the surface of the capsule core by microfluidic method as a capsule shell; the temperature control material is capsule-shaped and has a particle size of 10 to 500 μm.

[0008] Preferably, the core material is selected from at least one of long-chain alkanes, fatty acids, long-chain esters and fatty alcohols.

[0009] Preferably, the long-chain alkane is a long-chain alkane with a molecular weight of 150 to 1500, and is selected from at least one of paraffin, tetradecane, dodecane, and hexadecane; the fatty acid is at least one of caprylic acid, stearic acid, and palmitic acid; the long-chain ester is methyl laurate; and the fatty alcohol is at least one of n-octanol and n-decanol.

[0010] Another technical solution of the present invention is achieved as follows: a method for preparing an organic microcapsule temperature control material based on microfluidic technology, the method specifically comprising the following steps:

[0011] S1, preparing a microfluidic chip including a microchannel by using a microfluidic method;

[0012] S2, 1-10g of capsule core material, 50-500mL of the first solvent, amino-polydimethylsiloxane and tetraethyl orthosilicate are uniformly mixed, and then a surfactant is added, and the mixture is stirred and uniformly mixed to prepare a uniform and stable dispersion as an inner phase; wherein the mass of the amino-polydimethylsiloxane is 1%-5% of the capsule core material; the mass of the tetraethyl orthosilicate is 1%-5% of the capsule core material; and the surfactant is 0.1%-5% of the capsule core material;

[0013] S3, 0.5-5 g of silicon dioxide, 1-10 g of polyurethane and 50-500 mL of the second solvent are mixed and stirred evenly to prepare a capsule shell layer solution as an external phase;

[0014] S4, introducing the inner phase and the outer phase into the microchannel of the microfluidic chip respectively, adjusting the flow rate ratio to (1-10):1, to prepare a high inner phase emulsion;

[0015] S5, adding hydrochloric acid solution as a catalyst dropwise into the high internal phase emulsion to initiate polymerization to form a polymer;

[0016] S6. Add ethanol and ionized water to the polymer, wash it three times, and then dry it at room temperature or high temperature for 12 to 48 hours to obtain an organic microcapsule temperature control material.

[0017] Preferably, in S1, the microchannel structure is a T-shaped structure with a width of 10 to 500 μm and a depth of 10 to 200 μm.

[0018] Preferably, in S2, the temperature during the stirring and mixing is 30-50°C.

[0019] Preferably, in S2, the capsule core material is made of at least one material selected from long-chain alkanes with a molecular weight of 150 to 1500, fatty acids, long-chain esters, and fatty alcohols; and the first solvent is at least one of ethanol, glycerol, ethylene glycol, propylene glycol, polyethylene glycol, acetone, ethyl acetate, and water.

[0020] Preferably, in S2, the surfactant is at least one of polyvinyl alcohol, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sulfated fatty acid ester, polyvinyl alcohol, polyethylene glycol octyl ether, and lecithin.

[0021] Preferably, in S3, the second solvent is at least one of ethanol, glycerol, ethylene glycol, propylene glycol, polyethylene glycol, acetone, ethyl acetate and water.

[0022] Preferably, in S6, the high temperature does not exceed 60°C.

[0023] Preferably, in S6, the organic microcapsule temperature control material is in capsule shape, and has a particle size of 10 to 500 μm.

[0024] Compared with the prior art, the organic microcapsule temperature control material prepared by the microfluidic technology of the present invention has uniform particle size and an error within ±10%; the temperature control material of the present invention forms a silica / polyurethane composite material shell layer, so that it has good stability and mechanical strength, can effectively prevent material leakage, and at the same time, the material morphology and performance will not change significantly when stored at room temperature for several months.

[0025] By adopting the preparation method of the present invention to prepare organic microcapsule temperature control materials, the yield can reach more than 60% to 80%; in addition, the process of the present invention is simple, easy to operate, and suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a flow chart for preparing the organic microcapsule-type temperature control material obtained in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the long-chain alkane microcapsule temperature control material obtained in Example 1 of the present invention; wherein 1 represents the capsule core, and 2 represents the capsule shell;

[0028] Figure 3 This is a physical picture of the long-chain alkane microcapsule temperature control material obtained in Example 1 of the present invention;

[0029] Figure 4 This is a DSC (differential scanning calorimetry) graph of the long-chain alkane capsule temperature control material obtained in Examples 1-3 of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] An embodiment of the present invention provides an organic microcapsule temperature control material based on microfluidic technology. The organic microcapsule temperature control material is centered on a capsule core, and a layer of silicon dioxide is evenly covered on the surface of the capsule core by a microfluidic method as a capsule shell; the temperature control material is capsule-shaped, and the particle size is 10 to 500 μm.

[0032] Among them, the core material is selected from at least one of long-chain alkanes, fatty acids, long-chain esters, and fatty alcohols; the long-chain alkanes are long-chain alkanes with a molecular weight of 150 to 1500, and are selected from at least one of paraffin, tetradecane, dodecane, and hexadecane; the fatty acid is at least one of caprylic acid, stearic acid, and palmitic acid; the long-chain esters are methyl laurate; and the fatty alcohol is at least one of n-octanol and n-decanol.

[0033] The embodiment of the present invention also provides a method for preparing the above-mentioned organic microcapsule temperature control material based on microfluidic technology, which specifically comprises the following steps:

[0034] S1. A microfluidic chip comprising a microchannel is prepared by a microfluidic method; the microchannel structure is a T-shaped structure, and the width is 10 to 500 μm and the depth is 10 to 200 μm;

[0035] S2, 1-10g of capsule core material, 50-500mL of the first solvent, amino-polydimethylsiloxane and tetraethyl orthosilicate are uniformly mixed, and then a surfactant is added, and the mixture is stirred and mixed uniformly at 30-50°C to prepare a uniform and stable dispersion as an inner phase; wherein the mass of the amino-polydimethylsiloxane is 1%-5% of the capsule core material; the mass of the tetraethyl orthosilicate is 1%-5% of the capsule core material; and the surfactant is 0.1%-5% of the capsule core material;

[0036] The capsule core material is a long-chain alkane selected from at least one of long-chain alkanes, fatty acids, long-chain esters, and fatty alcohols; the long-chain alkane is a long-chain alkane with a molecular weight of 150 to 1500, and is selected from at least one of paraffin, tetradecane, dodecane, and hexadecane; the fatty acid is at least one of octanoic acid, stearic acid, and palmitic acid; the long-chain ester is methyl laurate; the fatty alcohol is at least one of n-octanol and n-decanol; the first solvent is at least one of ethanol, glycerol, ethylene glycol, propylene glycol, polyethylene glycol, acetone, ethyl acetate, and water; the surfactant is at least one of polyvinyl alcohol, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sulfated fatty acid esters, polyvinyl alcohol, polyethylene glycol octyl ether, and lecithin;

[0037] S3, 0.5-5g of silicon dioxide, 1-10g of polyurethane and 50-500mL of a second solvent are mixed and stirred evenly to prepare a capsule shell solution as an external phase; the second solvent is at least one of ethanol, glycerol, ethylene glycol, propylene glycol, polyethylene glycol, acetone, ethyl acetate and water;

[0038] S4, introducing the inner phase and the outer phase into the microchannel of the microfluidic chip respectively, adjusting the flow rate ratio to (1-10):1, to prepare a high inner phase emulsion;

[0039] S5, adding hydrochloric acid solution as a catalyst dropwise into the high internal phase emulsion to initiate polymerization to form a polymer;

[0040] S6. Add ethanol and ionized water to the polymer, wash three times, and then dry at room temperature or high temperature not exceeding 60° C. for 12 to 48 hours to obtain an organic microcapsule temperature control material. The long-chain alkane capsule-type temperature control material is capsule-shaped and has a uniform particle size of 10 to 500 μm.

[0041] The following are specific embodiments

[0042] The microfluidic chips in the following embodiments are all prepared in the same manner, specifically: the microfluidic chips are prepared using photolithography and soft photolithography techniques, and the microchannel structure is T-shaped, with a width of 100 μm and a depth of 50 μm.

[0043] Example 1

[0044] The long-chain alkane microcapsule temperature control material provided in Example 1 of the present invention is obtained by the following method:

[0045] S1. A microfluidic chip having a T-shaped structure and a microchannel with a width of 100 μm and a depth of 50 μm was prepared by a microfluidic method;

[0046] S2, dispersing 1g of a long-chain alkane with a molecular weight of 150 to 1500 in 1% amino-polydimethylsiloxane and ethyl orthosilicate by weight of the long-chain alkane, adding 50mL of ethanol and 0.1% of the surfactant polyvinyl alcohol by weight of the long-chain alkane, and stirring for 30 minutes to obtain a stable dispersion of the temperature-control material as the internal phase;

[0047] S3, dissolving 0.5 g of silicon dioxide and 1 g of polyurethane in 50 mL of ethanol, stirring evenly to obtain a uniform capsule shell layer solution as the external phase;

[0048] S4, introducing the temperature control material dispersion and the capsule shell layer solution into the microchannel of the microfluidic chip respectively, and adjusting the flow rate ratio of the temperature control material dispersion and the capsule shell layer solution to 1:1 (specifically, the flow rate of the core material dispersion is 0.011 mL / min, and the flow rate of the shell layer solution is 0.011 mL / min) to prepare a high internal phase emulsion;

[0049] S5, adding 50 mL of hydrochloric acid solution as a catalyst dropwise into the high internal phase emulsion to initiate polymerization, thereby generating a capsule-type polymer with a particle size of 10 μm and uniform particle size;

[0050] S6. Add ethanol and ionized water to the capsule-type polymer, wash three times, and then dry at room temperature or high temperature not exceeding 60° C. for 30 h to obtain a long-chain alkane microcapsule temperature control material with a particle size of 20 μm and uniform particle size.

[0051] The core of the long-chain alkane microcapsule temperature control material obtained in this Example 1 is selected from long-chain alkanes with a molecular weight of 150 to 1500, and the shell layer is a silica / polyurethane composite material. The temperature control material is prepared by microfluidic technology. This temperature control material has good stability, uniform size, low equipment requirements, and has broad application prospects.

[0052] Example 2

[0053] The fatty acid microcapsule temperature control material provided in Example 2 of the present invention is obtained by the following method:

[0054] S1. A microfluidic chip having a T-shaped structure and a microchannel with a width of 100 μm and a depth of 50 μm was prepared by a microfluidic method;

[0055] S2, dispersing 1g of fatty acid in amino-polydimethylsiloxane and ethyl orthosilicate accounting for 1% of the mass of long-chain alkanes, adding 50mL of ethanol and a surfactant polyvinyl alcohol accounting for 0.1% of the mass of long-chain alkanes, and stirring for 30min to obtain a stable dispersion of temperature-controlling material as the internal phase;

[0056] S3, dissolving 0.5 g of silicon dioxide and 1 g of polyurethane in 50 mL of ethanol, stirring evenly to obtain a uniform capsule shell layer solution as the external phase;

[0057] S4, introducing the temperature control material dispersion and the capsule shell layer solution into the microchannel of the microfluidic chip respectively, and adjusting the flow rate ratio of the temperature control material dispersion and the capsule shell layer solution to 1:1 (specifically, the flow rate of the core material dispersion is 0.011 mL / min, and the flow rate of the shell layer solution is 0.011 mL / min) to prepare a high internal phase emulsion;

[0058] S5, adding 50 mL of hydrochloric acid solution as a catalyst dropwise into the high internal phase emulsion to initiate polymerization, thereby generating a capsule-type polymer with a particle size of 10 μm and uniform particle size;

[0059] S6. Add ethanol and ionized water to the capsule-type polymer, wash three times, and then dry at room temperature or high temperature not exceeding 60° C. for 30 h to obtain a fatty acid microcapsule temperature control material with a particle size of 20 μm and uniform particle size.

[0060] Example 3

[0061] The long-chain ester microcapsule temperature control material provided in Example 3 of the present invention is obtained by the following method:

[0062] S1. A microfluidic chip having a T-shaped structure and a microchannel with a width of 100 μm and a depth of 50 μm was prepared by a microfluidic method;

[0063] S2, dispersing 1g of long-chain esters in 1% amino-polydimethylsiloxane and ethyl orthosilicate by weight of the long-chain alkanes, adding 50mL of ethanol and 0.1% of the surfactant polyvinyl alcohol by weight of the long-chain alkanes, and stirring for 30min to obtain a stable dispersion of the temperature-control material as the internal phase;

[0064] S3, dissolving 0.5 g of silicon dioxide and 1 g of polyurethane in 50 mL of ethanol, stirring evenly to obtain a uniform capsule shell layer solution as the external phase;

[0065] S4, introducing the temperature control material dispersion and the capsule shell layer solution into the microchannel of the microfluidic chip respectively, and adjusting the flow rate ratio of the temperature control material dispersion and the capsule shell layer solution to 1:1 (specifically, the flow rate of the core material dispersion is 0.011 mL / min, and the flow rate of the shell layer solution is 0.011 mL / min) to prepare a high internal phase emulsion;

[0066] S5, adding 50 mL of hydrochloric acid solution as a catalyst dropwise into the high internal phase emulsion to initiate polymerization, thereby generating a capsule-type polymer with a particle size of 10 μm and uniform particle size;

[0067] S6. Add ethanol and ionized water to the capsule-type polymer, wash three times, and then dry at room temperature or high temperature not exceeding 60° C. for 30 h to obtain a long-chain ester microcapsule temperature control material with a particle size of 20 μm and uniform particle size.

[0068] Example 4

[0069] The fatty alcohol microcapsule temperature control material provided in Example 4 of the present invention is obtained by the following method:

[0070] S1. A microfluidic chip having a T-shaped structure and a microchannel with a width of 100 μm and a depth of 50 μm was prepared by a microfluidic method;

[0071] S2, dispersing 1g of fatty alcohol in amino-polydimethylsiloxane and ethyl orthosilicate accounting for 1% of the mass of long-chain alkanes, and then adding 50mL of ethanol and a surfactant polyvinyl alcohol accounting for 0.1% of the mass of long-chain alkanes, and stirring for 30min to obtain a stable dispersion of temperature-controlling material as the internal phase;

[0072] S3, dissolving 0.5 g of silicon dioxide and 1 g of polyurethane in 50 mL of ethanol, stirring evenly to obtain a uniform capsule shell layer solution as the external phase;

[0073] S4, introducing the temperature control material dispersion and the capsule shell layer solution into the microchannel of the microfluidic chip respectively, and adjusting the flow rate ratio of the temperature control material dispersion and the capsule shell layer solution to 1:1 (specifically, the flow rate of the core material dispersion is 0.011 mL / min, and the flow rate of the shell layer solution is 0.011 mL / min) to prepare a high internal phase emulsion;

[0074] S5, adding 50 mL of hydrochloric acid solution as a catalyst dropwise into the high internal phase emulsion to initiate polymerization, thereby generating a capsule-type polymer with a particle size of 10 μm and uniform particle size;

[0075] S6. Add ethanol and ionized water to the capsule-type polymer, wash three times, and then dry at room temperature or high temperature not exceeding 60° C. for 30 h to obtain a fatty alcohol microcapsule temperature control material with a particle size of 20 μm and uniform particle size.

[0076] The following are specific embodiments

[0077] According to the method of the above-mentioned Example 1, by adjusting the type of long-chain alkane selected for the core of the microcapsule temperature control material and the capsule particle size, and keeping other process parameters unchanged, the long-chain alkane microcapsule temperature control materials of Examples 1-1 to 1-8 as shown in Table 1 below were obtained.

[0078] Table 1 Related parameters of long-chain alkane microcapsule temperature control materials obtained in Examples 1-1 to 1-8

[0079] Example Long-chain alkanes used as microcapsule cores Average particle size of microcapsules (μm) 1-1 Dodecane 20 1-2 Tetradecane 30 1-3 Hexadecane 40 1-4 paraffin 50 1-5 Dodecane 60 1-6 Tetradecane 100 1-7 Hexadecane 150 1-8 paraffin 200

[0080] Furthermore, according to the method of the above-mentioned Example 2, by adjusting the type of fatty acid selected for the core of the microcapsule temperature control material and the capsule particle size, and keeping other process parameters unchanged, the fatty acid microcapsule temperature control materials of Examples 1-1 to 1-8 as shown in Table 2 below were obtained.

[0081] Table 2 Related parameters of fatty acid microcapsule temperature control materials obtained in Examples 2-1 to 2-3

[0082] Example Fatty acids used in microcapsule core Average particle size of microcapsules (μm) 2-1 bitter 30 2-2 Stearic acid 40 2-3 Palmitic acid 50

[0083] Furthermore, according to the method of the above-mentioned Example 3, by adjusting the type of long-chain esters selected for the core of the microcapsule temperature control material and the capsule particle size, and keeping other process parameters unchanged, the long-chain ester microcapsule temperature control material of Example 3-1 as shown in Table 3 below was obtained.

[0084] Table 3 Related parameters of the long-chain ester microcapsule temperature control material obtained in Example 3-1

[0085] Example Long-chain esters selected for microcapsule core Average particle size of microcapsules (μm) 3-1 Methyl laurate 45

[0086] Furthermore, according to the method of the above-mentioned Example 4, by adjusting the type of fatty alcohol selected for the core of the microcapsule temperature control material and the capsule particle size, and keeping other process parameters unchanged, the fatty alcohol microcapsule temperature control material of Example 3-1 as shown in Table 4 below was obtained.

[0087] Table 4 Related parameters of fatty alcohol microcapsule temperature control materials obtained from Example 4-1 to Example 4-2

[0088] Example Fatty alcohol selected for microcapsule core Average particle size of microcapsules (μm) 4-1 n-Octanol 45 4-2 n-Decanol 50

[0089] In combination with the above specific embodiments, in order to verify the organic microcapsule temperature control material obtained in the embodiments of the present invention, the latent heat performance of the microcapsule temperature control materials prepared in Examples 1-1 to 1-4, 2-1 to 2-3, 3-1, and 4-1 to 4-3 was tested by differential scanning calorimetry. The test results are shown in Table 5 below.

[0090] Table 5 Performance test results of temperature control materials obtained in some specific examples above

[0091]

[0092]

[0093] Figure 4 Schematic diagram of the latent heat performance test of the tetradecane capsule temperature control material prepared in Example 1-3 (DSC diagram); Figure 4 It can be seen that the temperature control temperature of the tetradecane capsule temperature control material obtained in Example 1-2 of the present invention is 9.3° C., and the heat absorbed or released is 115 J / g.

[0094] From Table 5 and Figure 4 It can be seen from the data in that the organic capsule-type temperature control material obtained in the embodiment of the present invention has a temperature control temperature of above 9.2° C., absorbs or releases heat of above 92 J / g, and has a yield of 60% to 80%.

[0095] In summary, the temperature control material prepared by the microfluidic technology of the present invention has uniform particle size and an error within ±10%; the temperature control material of the present invention forms a silica / polyurethane composite material shell layer, so that it has good stability and mechanical strength, can effectively prevent material leakage, and at the same time, the material morphology and performance will not change significantly when stored at room temperature for several months; in addition, by adopting the preparation method of the present invention to prepare the temperature control material, the yield can reach more than 60% to 80%; in addition, the process of the present invention is simple, easy to operate, and suitable for large-scale production.

[0096] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An organic microcapsule temperature control material based on microfluidic technology, characterized in that: The organic microcapsule temperature control material takes the capsule core as the center, and adopts a microfluidic method to evenly cover a layer of silicon dioxide layer on the surface of the capsule core as a capsule shell; the temperature control material is capsule-shaped, and the particle size is 10-500 μm.

2. The organic microcapsule temperature control material based on microfluidic technology according to claim 1, characterized in that: The core material is selected from at least one of long-chain alkanes, fatty acids, long-chain esters and fatty alcohols.

3. The organic microcapsule temperature control material based on microfluidic technology according to claim 2, characterized in that: The long-chain alkane is a long-chain alkane with a molecular weight of 150 to 1500, and is selected from at least one of paraffin, tetradecane, dodecane, and hexadecane; the fatty acid is at least one of caprylic acid, stearic acid, and palmitic acid; the long-chain ester is methyl laurate; and the fatty alcohol is at least one of n-octanol and n-decanol.

4. The method for preparing an organic microcapsule temperature control material based on microfluidic technology according to any one of claims 1 to 3, characterized in that: The method specifically comprises the following steps: S1, preparing a microfluidic chip including a microchannel by using a microfluidic method; S2, 1-10g of capsule core material, 50-500mL of the first solvent, amino-polydimethylsiloxane and tetraethyl orthosilicate are uniformly mixed, and then a surfactant is added, and the mixture is stirred and uniformly mixed to prepare a uniform and stable dispersion as an inner phase; wherein the mass of the amino-polydimethylsiloxane is 1%-5% of the capsule core material; the mass of the tetraethyl orthosilicate is 1%-5% of the capsule core material; and the surfactant is 0.1%-5% of the capsule core material; S3, 0.5-5 g of silicon dioxide, 1-10 g of polyurethane and 50-500 mL of the second solvent are mixed and stirred evenly to prepare a capsule shell layer solution as an external phase; S4, introducing the inner phase and the outer phase into the microchannel of the microfluidic chip respectively, adjusting the flow rate ratio to (1-10):1, to prepare a high inner phase emulsion; S5, adding hydrochloric acid solution as a catalyst dropwise into the high internal phase emulsion to initiate polymerization to form a polymer; S6. Add ethanol and ionized water to the polymer, wash it three times, and then dry it at room temperature or high temperature for 12 to 48 hours to obtain an organic microcapsule temperature control material.

5. The method for preparing an organic microcapsule temperature control material based on microfluidic technology according to claim 4, characterized in that: In S1, the microchannel structure is a T-shaped structure with a width of 10 to 500 μm and a depth of 10 to 200 μm.

6. The method for preparing an organic microcapsule temperature control material based on microfluidic technology according to claim 5, characterized in that: In the above S2, the temperature during the stirring and mixing is 30 to 50°C.

7. The method for preparing an organic microcapsule temperature control material based on microfluidic technology according to claim 6, characterized in that: In S2, the capsule core is made of at least one material selected from long-chain alkanes with a molecular weight of 150 to 1500, fatty acids, long-chain esters, and fatty alcohols; the first solvent is at least one of ethanol, glycerol, ethylene glycol, propylene glycol, polyethylene glycol, acetone, ethyl acetate, and water.

8. The method for preparing an organic microcapsule temperature control material based on microfluidic technology according to claim 6 or 7, characterized in that: In S2, the surfactant is at least one of polyvinyl alcohol, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sulfated fatty acid ester, polyvinyl alcohol, polyethylene glycol octyl ether, and lecithin.

9. The method for preparing an organic microcapsule temperature control material based on microfluidic technology according to claim 4, characterized in that: In S3, the second solvent is at least one of ethanol, glycerol, ethylene glycol, propylene glycol, polyethylene glycol, acetone, ethyl acetate, and water.

10. The method for preparing an organic microcapsule temperature control material based on microfluidic technology according to claim 4, characterized in that: In S6, the high temperature does not exceed 60°C.

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