Method for preparing micron-order phase-change microemulsion

A phase change microemulsion and micron-scale technology, which is applied in the field of preparation of micron-scale phase change microemulsion, can solve the problems of improving the supercooling phenomenon of non-microemulsion, and achieve the effects of overcoming poor stability, reducing volume and reducing supercooling.

Active Publication Date: 2015-02-25
杭州鲁尔新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of phase change materials in the microemulsion prepared by this method is generally not higher than 30%, and the energy storage density is relatively limited.
In addition, the undercooling degree of nanoscale phase change microemulsions generally exceeds 15K, and the phase change microemulsions prepared by this method have not improved the supercooling phenomenon of microemulsions.

Method used

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  • Method for preparing micron-order phase-change microemulsion
  • Method for preparing micron-order phase-change microemulsion
  • Method for preparing micron-order phase-change microemulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 1.5 g of paraffin wax with a melting point of 35° C. into 15 g of n-tetradecane, heat to 50° C. and stir to completely melt the solid matter to form a dispersed phase. Add 1.5 g of polyoxyethylene sorbitan monooleate 40 (Tween40) into a mixture of 26 g of propylene glycol (antifreeze) and 56 g of water, heat to 50° C. and stir to form a continuous phase. The dispersed phase is added to the continuous phase with constant stirring to form a pre-emulsion. Stir the pre-emulsion with a high-speed homogenizer, and emulsify it for 8 minutes at a speed of 20,000 rpm. The product is an opaque milky white phase-change microemulsion, wherein the weight ratio of the phase-change material is 15%.

Embodiment 2

[0038]Add 0.5 g of zinc oxide nanoparticles (average particle size of 0.1 μm) into 35 g of n-tetradecane, heat to 40° C. and stir to completely melt the solid matter to form a dispersed phase. Add 3.5 g of didodecyldimethylammonium bromide (DDAB) into a mixture of 15 g of ethanol (antifreeze) and 46 g of water, heat to 40° C. and stir to form a continuous phase. The dispersed phase is added to the continuous phase with constant stirring to form a pre-emulsion. Use a high-speed homogenizer to stir the pre-emulsion, and emulsify for 10 minutes at a speed of 22000 rpm. The product is an opaque milky white phase-change microemulsion, wherein the weight ratio of the phase-change material is 35%.

Embodiment 3

[0040] Add 2 g of stearic acid into 50 g of n-pentadecane, heat to 80° C. and stir to completely melt the solid matter to form a dispersed phase. Add 3.5 g of sodium dodecyl sulfate (SDS) to 44.5 g of water, heat to 80° C. and stir to form a continuous phase. The dispersed phase is added to the continuous phase with constant stirring to form a pre-emulsion. Use a high-speed homogenizer to stir the pre-emulsion, and emulsify it at a speed of 25000 rpm for 10 minutes. The product is an opaque milky white phase-change microemulsion, wherein the weight ratio of the phase-change material is 50%.

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Abstract

The invention discloses a method for preparing a micron-order phase-change microemulsion. The method comprises the following steps of: adding a nucleating agent into a phase-change material with a melting point of 0-20 DEG C, and heating and mixing the obtained mixture, so that the phase-change material is completely liquefied and the nucleating agent is dissolved in the liquefied phase-change material so as to form transparent liquid; adding a surfactant into water or a liquid mixture of water and an anti-freezing agent, heating the obtained mixture until the temperature of the mixture is same as the temperature of a dispersed phase, and stirring the mixture, so that the surfactant is dissolved in the water or the liquid mixture of water and the anti-freezing agent so as to form transparent liquid; adding the dispersed phase into a continuous phase while persistently stirring so as to form a preformed emulsion; and stirring the preformed emulsion by using a high-speed homogenizer, so that the micron-order phase-change microemulsion disclosed by the invention can be obtained. The preparation method disclosed by the invention is simple in steps and low in cost, and the prepared micron-order phase-change microemulsion is high in energy storage density, stable in performance and small in degree of super-cooling, can be pumped and can be used as a heat storage medium and a heat transfer medium for refrigeration systems.

Description

technical field [0001] The invention relates to a preparation method of a phase change energy storage material, in particular to a preparation method of a micron-scale phase change microemulsion. Background technique [0002] Traditional air conditioning systems use water as a heat storage carrier and heat transfer medium. Water has a large specific heat. As a sensible heat energy storage material, water absorbs and releases heat by the induction of the surrounding environment. Generally, the temperature difference between the outlet water and return water of chilled water is not much, generally only 6K to 12K, and the energy storage density is low. Therefore, the water flow in the chilled water circulation system is often high during the heat transfer and storage process. The commonly used cold water storage system It requires a large volume. [0003] The use of phase change materials as energy storage carriers and heat transfer media can greatly increase the energy densi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
Inventor 黄莉
Owner 杭州鲁尔新材料科技有限公司
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