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Preparation method of elastic phase change microcapsules

A phase-change microcapsule and elasticity technology, applied in microcapsule preparation, microsphere preparation and other directions, can solve the problems of high brittleness, poor structural strength and low glass transition temperature of microcapsules, and achieve controllable size and coating rate, The effect of avoiding breakage and easy operation

Inactive Publication Date: 2014-07-23
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the late 1970s, General Electric added phase-change microcapsules to thermal fluids to increase the heat transfer and storage properties of thermal fluids, but ended in failure due to the high brittleness and poor structural strength of the microcapsules.
At present, there are few reports on the preparation of phase-change microcapsules by microfluidic technology; silicone rubber has a low glass transition temperature, low elastic modulus, and high elasticity, and phase-change microcapsules using high-elastic silicone rubber as the shell material have never been seen. to report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of elastic phase change microcapsules of the present invention, the steps are:

[0020] (1) For the coaxial annular tube microchannel, the pre-coated phase change material is C 12 ~C 48 The linear alkanes or halogenated linear alkanes are used as the innermost phase, a certain proportion of vinyl silicone oil, hydrogen-containing silicone oil and self-made Pt catalyst mixture is used as the middle phase, and the outermost phase is a certain concentration of polyacrylic acid aqueous solution.

[0021] (2) Measure the density and viscosity of the phase change material described in step (1), vinyl silicone oil and polyacrylic acid aqueous solution at different temperatures, and determine the temperature for the preparation and curing reaction of the double emulsion.

[0022] (3) Mix a certain proportion of vinyl silicone oil, hydrogen-containing silicone oil and Pt catalyst evenly as the pre-reactant of the microcapsule shell.

[0023] (4) Through ...

Embodiment 1

[0036] (1) Take 2mL of hexadecane bromide with a 5mL syringe, take 50mL of 0.15% polyacrylic acid aqueous solution with a 50mL syringe, fix the syringe on the micro-syringe pump, and connect the innermost phase and the Outermost channel connection.

[0037] (2) Take 2mL of vinyl silicone oil, 0.05mL of hydrogen-containing silicone oil and 0.0025mL of Pt catalyst in a small beaker, and stir rapidly with magnetic force for 1 minute. Then take 1.5mL with a 5mL syringe and fix it in a micro-syringe pump and connect it with the interphase channel of the coaxial ring tube microchannel.

[0038] (3) Adjust the flow rate of the coaxial ring tube microchannel to 15 、15 , 833 . Open the outermost phase first, then open the middle phase, and finally open the innermost phase.

[0039] (4) Use a beaker to receive the double emulsion from the microchannel of the coaxial ring tube, place it at 20°C for one hour, and keep the temperature at 50°C for three hours to cure the silicon...

Embodiment 2

[0042] Steps (1), (2), and (4) are the same as in Example 1.

[0043] Step (3) Adjust the flow rate of the coaxial ring tube microchannel to 10 、10 , 833 . Open the outermost phase first, then open the middle phase, and finally open the innermost phase.

[0044] Step (5) is the same as in Example 1, but the outer diameter of the obtained microcapsules is about 446 μm, and the inner diameter is about 254 μm.

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Abstract

The invention provides a preparation method of elastic phase change microcapsules, and particularly relates to phase change microcapsules in which a shell material prepared by using a microfluidic technology is used as an elastic material, and a preparation method of the phase change microcapsules. The shell material of the microcapsules has the elastic property, so that a certain range of pressure change can be overcome by the microcapsules in the phase change or application process, and the shell material is avoided being damaged. The sizes and the coating rates of the elastic phase change microcapsules prepared by adopting the method can be controlled, and the elastic phase change microcapsules have the monodispersity. By adopting the microfluidic technology, the method is simple in equipment, easy to operate and relatively low in waste of organic solvent, and an outmost phase solution can be repeatedly utilized, so that the effects of saving energy, reducing consumption and protecting environments can be achieved; and therefore, the method is suitable for being used in industrial promotion.

Description

technical field [0001] The invention belongs to the technical field of phase change microcapsule material preparation. Specifically relates to a preparation method of elastic phase change microcapsules. Background technique [0002] Phase change materials use the phase change heat absorbed or released when a substance undergoes a phase change to store and supply energy, while phase change microcapsules use microcapsule technology to coat phase change materials in capsules to form a core-shell structure. Tiny particles. Due to the microencapsulation of phase change materials, the shape change and material loss of phase change materials are not easy to occur during the phase change process; the phase change materials are isolated from the external environment due to being coated, and their physical and chemical properties can be preserved; Fixing the phase change material in the microcapsule can also increase the specific surface area of ​​the phase change material, thereby...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
Inventor 李波付真金张占文杨睿戆苏琳李洁李婧刘一杨
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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