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Magnetic phase transition microcapsule and preparation method thereof

A magnetic phase transition and microcapsule technology, which is applied in the direction of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problems of fluid flow control, non-magnetism, and inability to solve local overheating, so as to save energy and cost The effect of low cost and simple preparation method

Inactive Publication Date: 2011-09-21
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the microcapsules prepared by them are not magnetic, when the microcapsules are applied to the latent heat functional fluid, the flow of the fluid cannot be controlled by an external magnetic field, and the problem of local overheating cannot be solved.

Method used

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  • Magnetic phase transition microcapsule and preparation method thereof
  • Magnetic phase transition microcapsule and preparation method thereof
  • Magnetic phase transition microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. First weigh 13.6940 grams of solid paraffin, then weigh 7.8251 grams of urea and 15.8618 grams of 37% formaldehyde solution according to the formula.

[0021] 2. Add urea to the formaldehyde solution in batches within 5 minutes, adjust the pH value to 8-9 with triethanolamine, and react at a constant temperature of 70°C for 1 hour under stirring with an electric mixer to obtain a urea-formaldehyde prepolymer solution. Add 0.2076 g of nano-iron powder to the polymer solution, and disperse it ultrasonically for 1.5 hours;

[0022] 3. Dissolve 0.2068 g of sodium dodecylsulfonate in 200 mL of deionized water, adjust the pH to 2 to 3 with citric acid, add solid paraffin to mix and melt, and stir vigorously with an electric mixer for 1 hour to make a paraffin wax emulsion;

[0023] 4. Mix the paraffin emulsion with the ultrasonically dispersed prepolymer, and stir evenly with an electric mixer;

[0024] 5. Stir the reactants with a motor, react at a constant temperature o...

Embodiment 2

[0026] 1. First weigh 12.8564 grams of n-octadecane, then weigh 3.6216 grams of urea, 3.8025 grams of melamine and 14.6820 grams of 37% formaldehyde solution according to the formula.

[0027] 2. Add urea into the formaldehyde solution in batches within 5 minutes, add melamine after the urea is completely dissolved, adjust the pH value to 8-9 with triethanolamine, and react at a constant temperature of 75°C for 1.25 hours under stirring with an electric mixer to obtain urea— Melamine-formaldehyde prepolymer solution, add 0.6435 gram nano-iron powder to the prepolymer solution, and ultrasonically disperse for 1 hour;

[0028] 3. Dissolve 0.1949 g of Tween 60 in 200 mL of deionized water, adjust the pH to 2 to 3 with citric acid, add n-octadecane to melt, stir vigorously with an electric mixer for 1 hour, and make n-octadecane emulsion;

[0029] 4. Mix the n-octadecane emulsion with the ultrasonically dispersed prepolymer, and stir evenly with an electric mixer;

[0030] 5. Sti...

Embodiment 3

[0032] 1. First weigh 14.5396 grams of n-tetradecane, and then weigh 8.4797 grams of melamine and 16.3708 grams of 37% formaldehyde solution according to the formula.

[0033] 2. Add melamine to the formaldehyde solution, adjust the pH value to 8-9 with triethanolamine, and react at a constant temperature of 65°C for 45 minutes under stirring with an electric mixer to obtain a melamine-formaldehyde prepolymer solution. Add 0.4362 gram nanometer ferric oxide, and ultrasonically dispersed for 0.5 hours;

[0034] 3. Dissolve 0.2181 g of sodium dodecylbenzenesulfonate in deionized water, adjust the pH value to 2 to 3 with citric acid, add n-tetradecane to melt, stir vigorously with an electric mixer for 1 hour, and make positive ten Tetrane emulsion;

[0035] 4. Mix the n-tetradecane emulsion with the ultrasonically dispersed prepolymer, and stir evenly with an electric mixer;

[0036] 5. Stir the reactants with a motor, react at a constant temperature of 85°C for 3 to 6 hours, ...

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Abstract

The invention discloses a magnetic phase transition microcapsule and a preparation method thereof. Nanometer magnetic powder is filled in a microcapsule material to form a shell, and a core material is wrapped in the shell. The magnetic phase transition microcapsule is prepared by the following steps: firstly, adding urea to a formaldehyde solution to dissolve or adding melamine to the formaldehyde solution, or adding the urea to the formaldehyde solution and adding melamine after fully dissolving the urea; then, reacting under stirring at a constant temperature to obtain a prepolymer solution; adding the nanometer magnetic powder to the prepolymer solution and dispersing the solution under ultrasound; dissolving an emulsifying agent in the water, adding an organic phase transition material and cutting and emulsifying the organic phase transition material at a high speed to prepare an emulsion; and uniformly mixing the emulsion and the prepolymer solution after ultrasonic dispersion and reacting under stirring at the constant temperature to obtain the magnetic phase transition microcapsule. The magnetic phase transition microcapsule has magnetism and can reach specific parts underthe guide of an external magnetic field while the magnetic phase transition microcapsule is applied to a latent heat type functional fluid so as to control the flow of the fluid.

Description

technical field [0001] The invention belongs to the preparation technology of phase-change microcapsules, in particular to a magnetic phase-change microcapsule and a preparation method thereof. Background technique [0002] Phase change microcapsules are composite phase change materials with a core-shell structure formed by coating the surface of solid-liquid phase change material particles with a stable film using microencapsulation technology. Microencapsulating the phase change material can not only effectively increase the heat conduction area, reduce the contact and reaction between the phase change material and the external environment, but also control the volume change of the material when the phase change occurs. Due to these excellent characteristics of phase change microcapsules, it can be used in textiles, latent heat functional fluids, buildings, military affairs, agriculture and other fields. Therefore, phase-change microcapsules have broad application prospec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/14C09K5/02
Inventor 宣益民李强黄勇
Owner NANJING UNIV OF SCI & TECH