Microcapsule phase change cooling liquid and preparation method thereof

Abstract

The invention relates to microcapsule phase change cooling liquid and a preparation method thereof, and belongs to the technical field of high polymer materials. The microcapsule phase change cooling liquid comprises the following components in parts by weight: 40-55 parts of ethylene glycol, 30-45 parts of deionized water, 5-14 parts of a core material, 3-6 parts of a wall material, 0.1-0.4 part of a dispersion stabilizer, 0.1-0.4 part of a corrosion inhibitor and 0.1-0.4 part of a modified antirust agent, the microcapsule phase change cooling liquid prepared by the invention not only has a good cooling effect, but also has excellent rust-proof and flame-retardant effects.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high polymer materials, and particularly relates to a microcapsule phase change cooling liquid and a preparation method thereof. BACKGROUND

[0002] In recent years, with the rapid development of the electronic and semiconductor industries, the trend of high integration of electronic components is obvious. In order to solve the problem of the mismatch between time and space in the heat dissipation of high-power electronic components in a small space, the phase change cooling liquid can absorb or release energy in the form of latent heat by phase transition, but the phase change cooling liquid often flows during the phase change process. The microcapsulation of the phase change cooling liquid can have good application prospects in the fields of building energy saving and constant temperature clothing, and expand the application field of phase change materials.

[0003] However, the ordinary microcapsule phase change cooling liquid is prone to rust during use, which affects its service life and limits its use range. In addition, although the ordinary microcapsule phase change cooling liquid has certain flame retardancy, with the continuous improvement of actual application requirements, its flame retardancy is difficult to meet the current demand. Therefore, it is of important practical significance and application value to develop a microcapsule phase change cooling liquid with excellent performance. SUMMARY

[0004] In order to solve the above technical problems, the application provides a microcapsule phase change cooling liquid and a preparation method thereof.

[0005] The purpose of the application can be achieved by the following technical scheme: A microcapsule phase change cooling liquid and a preparation method thereof, comprising the following raw materials by weight: ethylene glycol 40-55 parts, deionized water 30-45 parts, core material 5-14 parts, wall material 3-6 parts, dispersion stabilizer 0.1-0.4 parts, corrosion inhibitor 0.1-0.4 parts, and modified anti-rust agent 0.1-0.4 parts. The core material is paraffin. The wall material is polymethyl methacrylate. The dispersion stabilizer is polyvinyl alcohol. The corrosion inhibitor is benzotriazole.

[0006] The modified anti-rust agent is prepared by the following method: Step A1: the nano-silicon dioxide is activated at 120 DEG C for 2.5h, then 3-(2, 3-epoxypropoxy) propyl trimethoxysilane, anhydrous ethanol and deionized water are added, ultrasonic dispersion is carried out for 10min, mechanical stirring is carried out for 20min, the pH of the system is adjusted to 5, reaction is carried out at 70 DEG C for 6h, after the reaction, centrifugation and filtration are carried out, and drying is carried out at 60 DEG C for 24h to obtain modified silicon dioxide; Further, the dosage ratio of nano-silica, 3-(2,3-epoxypropoxy) propyl trimethoxysilane, anhydrous ethanol and deionized water is 0.01-0.04 mol: 0.01-0.04 mol: 10-30 mL: 5-10 mL; Step A2: uniformly mix alanine and o-xylene, heat to 90°C, then slowly add tetraethylene pentamine, then heat to 150°C, react for 4h, then heat to 190°C, react for 4h, to obtain an intermediate product; Further, the dosage ratio of alanine, o-xylene and tetraethylene pentamine is 0.02-0.08 mol: 50 mL: 0.01-0.04 mol; Step A3: mix the intermediate product, 6-chloro-1-hexene and methanol, reflux for 12h, cool to room temperature, then add tetrahydrofuran, centrifuge at 4000r / min for 3min, then cool to room temperature, add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and N,N-dimethylformamide, stir at 145°C for 9h, filter, wash, and vacuum dry at 60°C for 24h, to obtain a pre-product; Further, the dosage ratio of the intermediate product, 6-chloro-1-hexene, methanol, tetrahydrofuran, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and N,N-dimethylformamide is 0.01-0.04 mol: 0.02-0.08 mol: 5-10 mL: 5-10 mL: 0.02-0.08 mol: 180-200 mL; Step A4: uniformly mix the pre-product, ethanol and modified silica, high-speed stir for 15min, react at 70°C for 1h, then ultrasonic oscillation for 30min, filter, wash, and dry, to obtain a modified anti-rust agent; Further, the dosage ratio of the pre-product, ethanol and modified silica is 0.01-0.04 mol: 20-30 mL: 0.02-0.08 mol.

[0007] A preparation method of a microcapsule phase change cooling liquid, specifically comprising the following steps: S1, mix ethylene glycol and deionized water, stir at 450-550r / min for 1-2h, to obtain a cooling base liquid; S2, mix the core material, wall material and cooling base liquid, stir at 550-650r / min for 20-40min, then ultrasonic dispersion for 10-20min, to obtain a phase change microcapsule suspension; S3, the phase change microcapsule suspension, dispersion stabilizer, corrosion inhibitor and modified rust inhibitor are mixed uniformly, stirred at 250-350 r / min for 200-350 min, the pH of the system is adjusted to 9-11, and stirred at 180-220 r / min for 30-60 min, to obtain the microcapsule phase change cooling liquid.

[0008] The present application has the following advantages: The microcapsule phase change cooling liquid has good cooling effect, and also has excellent rust prevention and flame retardation effect, further prolonging the service life.

[0009] The modified rust inhibitor prepared in the present application is first modified by 3-(2,3-epoxypropoxy) propyl trimethoxysilane to prepare modified silicon dioxide; secondly, the carboxyl group of alanine and the amino group of tetraethylenepentamine are amidated to prepare an intermediate product containing bis-imidazoline; then, the chlorine atom of 6-chloro-1-hexene and the intermediate product undergo quaternary ammonium saltization reaction, and the carbon-carbon double bond of 6-chloro-1-hexene and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide react to generate a pre-product; finally, the amino group of the pre-product and the epoxy group of the modified silicon dioxide are reacted to prepare the modified rust inhibitor. The five-membered nitrogen-containing heterocyclic ring of the intermediate product containing bis-imidazoline is tightly adsorbed on the metal surface by electrostatic attraction and large pi bond to form a dense protective film, effectively isolating the water phase corrosion medium and significantly reducing the corrosion rate. The pre-product generated after the quaternization of the nitrogen atom combines with the negative charge on the metal surface through the positive charge, effectively inhibiting the anode reaction, covering the active sites on the metal surface, further enhancing the isolation effect, inhibiting the electron transfer process of the corrosion reaction, and significantly reducing the corrosion rate. Secondly, the nano-silicon dioxide has a very high specific surface area and surface energy, can form a uniform dispersion system with the phase change material, and uses the nanoparticle pores as a heat conduction bridge to reduce the heat conduction resistance, significantly improving the heat response speed of the cooling liquid and the overall heat conduction efficiency. In addition, the bis-imidazoline is coated in the microcapsule, which can significantly improve the slow-release rust prevention performance. The microcapsule controls the release rate to ensure that the metal surface is always covered with a protective film, prolongs the service life of the cooling liquid, realizes long-term rust prevention, and reduces the replacement frequency. In addition, the phosphorus-nitrogen flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, as a high-thermal-stability phosphaphenanthrene compound, promotes the formation of a dense and continuous carbon layer during combustion, effectively isolates oxygen, blocks the exchange of heat and combustible gas, and cooperates with the phosphorus-oxygen double bond to retard flame, prolonging the service life. DETAILED DESCRIPTION

[0010] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0011] Embodiment 1: A preparation method of a microcapsule phase change cooling liquid, specifically comprising the following steps: S1, the raw materials are weighed according to the weight parts, 40 parts of ethylene glycol, 30 parts of deionized water, 5 parts of core material, 3 parts of wall material, 0.1 part of dispersion stabilizer, 0.1 part of corrosion inhibitor, 0.1 part of modified anti-rust agent (prepared by the present embodiment); ethylene glycol and deionized water are mixed, stirred at 450 r / min for 1 h, and a cooling base liquid is prepared; S2, the paraffin, polymethyl methacrylate and cooling base liquid are mixed, stirred at 550 r / min for 20 min, and then ultrasonically dispersed for 10 min to prepare a phase change microcapsule suspension; S3, the phase change microcapsule suspension, polyvinyl alcohol, benzotriazole and modified anti-rust agent are uniformly mixed, stirred at 250 r / min for 200 min, the pH of the system is adjusted to 9, and then stirred at 180 r / min for 30 min to prepare a microcapsule phase change cooling liquid; The modified anti-rust agent is prepared by the following method: Step A1: 0.01 mol of nano silicon dioxide is activated at 120℃ for 2.5 h, then 0.01 mol of 3-(2,3-epoxypropoxy) propyl trimethoxysilane, 10 mL of anhydrous ethanol and 5 mL of deionized water are added, ultrasonic dispersion is carried out for 10 min, then mechanical stirring is carried out for 20 min, the pH of the system is adjusted to 5, and reaction is carried out at 70℃ for 6 h. After the reaction is completed, centrifugation, filtration and drying at 60℃ for 24 h are carried out to prepare modified silicon dioxide; Step A2: 0.02 mol of alanine and 50 mL of o-xylene are uniformly mixed, heated to 90℃, then 0.01 mol of tetraethylenepentamine is slowly added, then heated to 150℃, reacted for 4 h, then heated to 190℃, reacted for 4 h to prepare an intermediate product; Step A3: 0.01 mol of the intermediate product, 0.02 mol of 6-chloro-1-hexene and 5 mL of methanol are mixed, refluxed for 12 h, then cooled to room temperature, 5 mL of tetrahydrofuran is added, centrifuged at a speed of 4000 r / min for 3 min, then cooled to room temperature, 0.02 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 180 mL of N,N-dimethylformamide are added, stirred at 145℃ for 9 h, filtered, washed and vacuum dried at 60℃ for 24 h to prepare a pre-product; Step A4: 0.01 mol of the pre-product, 20 mL of ethanol and 0.02 mol of modified silica were mixed uniformly, stirred at high speed for 15 min, reacted at 70°C for 1 h, and then ultrasonically oscillated for 30 min. After filtration, washing and drying, the modified rust inhibitor was prepared.

[0012] Example 2: A preparation method of a microcapsule phase change cooling liquid, specifically comprising the following steps: S1, the raw materials were weighed according to the weight parts, 45 parts of ethylene glycol, 35 parts of deionized water, 8 parts of core material, 4 parts of wall material, 0.2 parts of dispersion stabilizer, 0.2 parts of corrosion inhibitor, 0.2 parts of modified rust inhibitor (prepared by this embodiment); ethylene glycol and deionized water were mixed and stirred at 480 r / min for 1.3 h to prepare a cooling base liquid; S2, the paraffin, polymethyl methacrylate and cooling base liquid were mixed and stirred at 580 r / min for 27 min, and then ultrasonically dispersed for 13 min to prepare a phase change microcapsule suspension; S3, the phase change microcapsule suspension, polyvinyl alcohol, benzotriazole and modified rust inhibitor were mixed uniformly, stirred at 280 r / min for 250 min, the pH of the system was adjusted to 10, and then stirred at 200 r / min for 40 min to prepare a microcapsule phase change cooling liquid; The modified rust inhibitor was prepared by the following method: Step A1: 0.02 mol of nano-silica was activated at 120°C for 2.5 h, then 0.02 mol of 3-(2,3-epoxypropoxy) propyl trimethoxysilane, 17 mL of anhydrous ethanol and 7 mL of deionized water were mixed, ultrasonically dispersed for 10 min, then mechanically stirred for 20 min, the pH of the system was adjusted to 5, and reacted at 70°C for 6 h. After the reaction was completed, centrifugation, filtration and drying at 60°C for 24 h were performed to prepare modified silica; Step A2: 0.04 mol of alanine and 50 mL of o-xylene were mixed uniformly, heated to 90°C, then 0.02 mol of tetraethylenepentamine was slowly added, then heated to 150°C, reacted for 4 h, then heated to 190°C, reacted for 4 h to prepare an intermediate product; Step A3: 0.02 mol of the intermediate product, 0.04 mol of 6-chloro-1-hexene and 7 mL of methanol were mixed, refluxed for 12 h, cooled to room temperature, then 7 mL of tetrahydrofuran was added, centrifuged at 4000 r / min for 3 min, then cooled to room temperature, 0.04 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 187 mL of N,N-dimethylformamide were mixed, stirred at 145°C for 9 h, filtered, washed, and vacuum dried at 60°C for 24 h to prepare a pre-product; Step A4: 0.02 mol of the pre-product, 23 mL of ethanol and 0.04 mol of modified silica were mixed uniformly, stirred at high speed for 15 min, reacted at 70°C for 1 h, and then ultrasonically oscillated for 30 min. After filtration, washing and drying, the modified rust inhibitor was prepared.

[0013] Example 3: A preparation method of a microcapsule phase change cooling liquid, specifically comprising the following steps: S1: The raw materials were weighed according to the weight parts, 50 parts of ethylene glycol, 40 parts of deionized water, 11 parts of core material, 5 parts of wall material, 0.3 parts of dispersion stabilizer, 0.3 parts of corrosion inhibitor and 0.3 parts of modified rust inhibitor (prepared by the present embodiment) were mixed. Ethylene glycol and deionized water were mixed and stirred at 510 r / min for 1.6 h to prepare a cooling base liquid; S2: The paraffin, polymethyl methacrylate and cooling base liquid were mixed and stirred at 610 r / min for 34 min, and then ultrasonically dispersed for 16 min to prepare a phase change microcapsule suspension; S3: The phase change microcapsule suspension, polyvinyl alcohol, benzotriazole and modified rust inhibitor were mixed uniformly, stirred at 310 r / min for 300 min, the pH of the system was adjusted to 10, and then stirred at 200 r / min for 50 min to prepare a microcapsule phase change cooling liquid; The modified rust inhibitor was prepared by the following method: Step A1: 0.03 mol of nano-silica was activated at 120°C for 2.5 h, and then 0.03 mol of 3-(2,3-epoxypropoxy) propyl trimethoxysilane, 24 mL of anhydrous ethanol and 9 mL of deionized water were mixed. After ultrasonic dispersion for 10 min, mechanical stirring was performed for 20 min, the pH of the system was adjusted to 5, and reaction was performed at 70°C for 6 h. After the reaction was completed, centrifugation, filtration and drying at 60°C for 24 h were performed to prepare modified silica; Step A2: 0.06 mol of alanine and 50 mL of o-xylene were mixed uniformly, heated to 90°C, and then 0.03 mol of tetraethylenepentamine was slowly added. After being heated to 150°C, reaction was performed for 4 h, and then after being heated to 190°C, reaction was performed for 4 h to prepare an intermediate product; Step A3: 0.03 mol of the intermediate product, 0.06 mol of 6-chloro-1-hexene and 9 mL of methanol were mixed, and reflux reaction was performed for 12 h. After being cooled to room temperature, 9 mL of tetrahydrofuran was added, centrifugation was performed at a speed of 4000 r / min for 3 min, and then after being cooled to room temperature, 0.06 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 194 mL of N,N-dimethylformamide were mixed, stirring was performed at 145°C for 9 h, and then filtration, washing and vacuum drying at 60°C for 24 h were performed to prepare a pre-product; Step A4: 0.03 mol of the pre-product, 26 mL of ethanol and 0.06 mol of modified silica were mixed uniformly, stirred at high speed for 15 min, reacted at 70°C for 1 h, and then ultrasonically oscillated for 30 min. After filtration, washing and drying, the modified rust inhibitor was prepared.

[0014] Example 4: A preparation method of a microcapsule phase change cooling liquid, specifically comprising the following steps: S1, the raw materials were weighed according to the weight parts, 55 parts of ethylene glycol, 45 parts of deionized water, 14 parts of core material, 6 parts of wall material, 0.4 parts of dispersion stabilizer, 0.4 parts of corrosion inhibitor, and 0.4 parts of modified rust inhibitor (prepared by the present embodiment); ethylene glycol and deionized water were mixed and stirred at 550 r / min for 2 h to prepare a cooling base liquid; S2, the paraffin, polymethyl methacrylate and cooling base liquid were mixed, stirred at 650 r / min for 40 min, and then ultrasonically dispersed for 20 min to prepare a phase change microcapsule suspension; S3, the phase change microcapsule suspension, polyvinyl alcohol, benzotriazole and modified rust inhibitor were mixed uniformly, stirred at 350 r / min for 350 min, the pH of the system was adjusted to 11, and then stirred at 220 r / min for 60 min to prepare a microcapsule phase change cooling liquid; The modified rust inhibitor was prepared by the following method: Step A1: 0.04 mol of nano-silica was activated at 120°C for 2.5 h, then 0.04 mol of 3-(2,3-epoxypropoxy) propyl trimethoxysilane, 30 mL of anhydrous ethanol and 10 mL of deionized water were mixed, ultrasonically dispersed for 10 min, then mechanically stirred for 20 min, the pH of the system was adjusted to 5, and reacted at 70°C for 6 h. After the reaction was completed, centrifugation, filtration and drying at 60°C for 24 h were performed to prepare modified silica; Step A2: 0.08 mol of alanine and 50 mL of o-xylene were mixed uniformly, heated to 90°C, then 0.04 mol of tetraethylenepentamine was slowly added, then heated to 150°C, reacted for 4 h, then heated to 190°C, reacted for 4 h to prepare an intermediate product; Step A3: 0.04 mol of the intermediate product, 0.08 mol of 6-chloro-1-hexene and 10 mL of methanol were mixed, refluxed for 12 h, cooled to room temperature, then 10 mL of tetrahydrofuran was added, centrifuged at 4000 r / min for 3 min, then cooled to room temperature, 0.08 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 200 mL of N,N-dimethylformamide were mixed, stirred at 145°C for 9 h, filtered, washed, and vacuum dried at 60°C for 24 h to prepare a pre-product; Step A4: 0.04 mol of the pre-product, 30 mL of ethanol and 0.08 mol of modified silica were mixed uniformly, stirred at high speed for 15 min, reacted at 70°C for 1 h, and then after ultrasonic oscillation for 30 min, filtration, washing and drying were performed to obtain the modified rust inhibitor.

[0015] Comparative Example 1: The comparative example is a microcapsule phase change cooling liquid, which is different from Example 3 in that an equal amount of sodium methylsilicate is used to replace the modified rust inhibitor prepared in Example 3, and the rest is the same.

[0016] Comparative Example 2: The comparative example is a microcapsule phase change cooling liquid, which is different from Example 3 in that the modified rust inhibitor does not add modified nano-silicon dioxide, and the rest is the same.

[0017] Performance test: The microcapsule phase change cooling liquids prepared in Examples 1-4 and Comparative Examples were made into standard test sizes, a heat source power of 28 W was used to heat the microcapsule phase change cooling liquid, and the heat balance time of the phase change cooling liquid was measured by a thermocouple; a salt spray test method was used, iron pieces coated with the microcapsule phase change cooling liquid were placed in a salt spray test box, and the test conditions were set as temperature 35°C, relative humidity 95%, sodium oxide solution concentration 5%, and continuous spraying for 48 h, and the rusting condition of the surface of the test piece was observed; through the oil pool fire test, a 10×10×5 cm 3 oil pool basin was used as a combustion container, 5 mL of n-heptane was used as an ignition agent, and the combustion phenomenon of the oil was observed; the test results are shown in Table 1: Table 1

[0018] As can be seen from the data in Table 1, the microcapsule phase change cooling liquid prepared by the present application has good cooling effect, and as can be seen from Table 1, the microcapsule phase change cooling liquid prepared by the present application has excellent rust prevention and flame retardant effect, and prolongs the service life.

[0019] The above content is only an example and description of the concept of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the concept of the present application or exceed the scope defined by the present claims, and they should belong to the protection scope of the present application.

Claims

1. A method for preparing a microcapsulated phase change cooling fluid, characterized in that, Specifically comprising the following steps: S1, the raw materials are weighed, and ethylene glycol 40-55 parts and deionized water 30-45 parts are mixed and stirred to prepare a cooling base liquid; S2, 5-14 parts of core material, 3-6 parts of wall material and the cooling base liquid are mixed and stirred, and then ultrasonic dispersion is carried out to prepare a phase change microcapsule suspension; S3, the phase change microcapsule suspension, 0.1-0.4 parts of a dispersion stabilizer, 0.1-0.4 parts of an inhibitor and 0.1-0.4 parts of a modified rust inhibitor are uniformly mixed and stirred, the pH of the system is adjusted to 9-11, and then stirring is carried out to prepare a microcapsule phase change cooling liquid; The modified rust inhibitor is prepared by the reaction of the amino group of a pre-product and the epoxy group of modified silicon dioxide, the pre-product is prepared by the reaction of 6-chloro-1-hexene and an intermediate product quaternary ammonium salt, and then reacted with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, the intermediate product is prepared by the reaction of the carboxyl group of alanine and the amino group of tetraethylenepentamine, and the modified silicon dioxide is prepared by modifying nano silicon dioxide with 3-(2, 3-epoxypropoxy) propyl trimethoxysilane.

2. The method of claim 1, wherein the microencapsulated phase change cooling fluid is prepared by the steps of: In step S1, the stirring speed is 450-550 r / min, and the stirring time is 1-2 h; in step S2, the stirring speed is 550-650 r / min, the stirring time is 20-40 min, and the ultrasonic time is 10-20 min.

3. The method for preparing a microcapsule phase change coolant according to claim 1, characterized in that, In step S3, the stirring speed is 250-350 r / min, the stirring time is 200-350 min, the stirring speed is 180-220 r / min, and the stirring time is 30-60 min.

4. The method of claim 1, wherein the microencapsulated phase change cooling fluid is prepared by the steps of: The modified rust inhibitor is prepared by the following method: Step A1: nano silicon dioxide is activated at 120℃ for 2.5 h, then 3-(2, 3-epoxypropoxy) propyl trimethoxysilane, anhydrous ethanol and deionized water are added and mixed, ultrasonic dispersion is carried out for 10 min, then mechanical stirring is carried out for 20 min, the pH of the system is adjusted to 5, reaction is carried out at 70℃ for 6 h, after the reaction is completed, centrifugation, filtration and drying at 60℃ for 24 h are carried out to prepare modified silicon dioxide; Step A2: alanine and o-xylene are uniformly mixed, heated to 90℃, then tetraethylenepentamine is slowly added, then heated to 150℃, reacted for 4 h, then heated to 190℃, reacted for 4 h to prepare an intermediate product; Step A3: the intermediate product, 6-chloro-1-hexene and methanol are mixed, refluxed for 12 h, then cooled to room temperature, mixed with tetrahydrofuran, centrifuged at a speed of 4000 r / min for 3 min, then cooled to room temperature, mixed with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and N, N-dimethylformamide, stirred at 145℃ for 9 h, filtered, washed, vacuum dried at 60℃ for 24 h to prepare a pre-product; Step A4: the pre-product, ethanol and modified silicon dioxide are uniformly mixed, high-speed stirring is carried out for 15 min, reaction is carried out at 70℃ for 1 h, then ultrasonic oscillation is carried out for 30 min, then filtration, washing and drying are carried out to prepare a modified rust inhibitor.

5. The method of claim 4, wherein the microencapsulated phase change cooling fluid is prepared by the steps of: The ratio of the amount of nano-silica, 3-(2,3-epoxypropoxy) propyl trimethoxysilane, anhydrous ethanol and deionized water in step A1 is 0.01-0.04 mol: 0.01-0.04 mol: 10-30 mL: 5-10 mL.

6. The method of claim 4, wherein the microencapsulated phase change cooling fluid is prepared by the steps of: The ratio of the amount of alanine, o-xylene and tetraethylenepentamine in step A2 is 0.02-0.08 mol: 50 mL: 0.01-0.04 mol.

7. The method of claim 4, wherein the microencapsulated phase change cooling fluid is prepared by the steps of: The ratio of the amount of intermediate product, 6-chloro-1-hexene, methanol, tetrahydrofuran, 9,10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide and N,N-dimethylformamide in step A3 is 0.01-0.04 mol: 0.02-0.08 mol: 5-10 mL: 5-10 mL: 0.02-0.08 mol: 180-200 mL.

8. The method of claim 4, wherein the microencapsulated phase change cooling fluid is prepared by the steps of: The ratio of the amount of pre-product, ethanol and modified silica in step A4 is 0.01-0.04 mol: 20-30 mL: 0.02-0.08 mol.

9. The method for preparing a microcapsule phase change coolant according to claim 1, characterized in that, The core material is paraffin wax, the wall material is polymethyl methacrylate, the dispersion stabilizer is polyvinyl alcohol and the corrosion inhibitor is benzotriazole.

10. A microencapsulated phase change cooling fluid, characterized in that, Prepared according to the preparation method in any one of claims 1-9. Prepared according to the preparation method in any one of claims 1-9.

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