Method of preparing phase-change energy-accumulation material microemulsion

A phase change energy storage material and technology of energy storage material, which are applied in the field of preparation of phase change energy storage material microemulsion, can solve the problems of thermodynamic instability, phase separation, demulsification, etc. Specific heat capacity, the effect of broad application prospects

Inactive Publication Date: 2009-08-19
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional emulsion is a thermodynamically unstable system, and the stability of the emulsion is poor. After multiple phase transitions of PCMS (such as 15 times), it is easy to produce demulsification and phase separation, float out in the water phase, and the energy storage performance decreases or even lost application value

Method used

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  • Method of preparing phase-change energy-accumulation material microemulsion
  • Method of preparing phase-change energy-accumulation material microemulsion
  • Method of preparing phase-change energy-accumulation material microemulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At 40°C, add 6g of 20 to a 250ml three-neck flask # Phase-change paraffin, 0.82g Span80, 1.32gTween80, 1.54g n-butanol, 0.48g NaCl, 50g distilled water, stirred at 400rpm for 5min, left to stand until the bubbles were completely eliminated (about 15min), and the product was completely transparent light yellow O / W type microemulsion. Phase change energy storage material (20 in this example) in the microemulsion # The content of phase change paraffin) is 10wt%.

Embodiment 2

[0027] At 50°C, add 6g of 30 to a 250ml three-neck flask # Phase change paraffin, 0.75g Span20, 1.25g emulsifier OP10, 1.62g n-butanol, 0.42g NaCl, 50g distilled water, stir at 500rpm for 5min, let it stand until the bubbles are completely eliminated (about 15min), the product is completely transparent shallow Yellow O / W microemulsion. Phase change energy storage material (30 in this example) in the microemulsion # The content of phase change paraffin) is 10wt%.

Embodiment 3

[0029] At 30°C, add 12g tetradecane, 0.9g Span65, 1.55g Pingpingjia, 1.62g n-pentanol, 0.52g NaCl, 56g deionized water into a 250ml three-necked flask, stir at 400rpm for 15min, and let it stand until the bubbles are completely Elimination (about 15min), the product is a completely transparent colorless O / W microemulsion. The content of the phase change energy storage material (tetradecane in this example) in the microemulsion is 20wt%.

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Abstract

The invention relates to a method for preparing phase change energy storage material microemulsion, comprising the steps: first, 10 parts by weight of organic phase change energy storage material can be prepared; 1-4 parts by weight of surface active agent, 1-3 parts by weight of cosurfactant, 0.3-1.5 parts by weight of inorganic salt and 10-100 parts by weight of de-ionized water or distilled water are added into the organic phase change energy storage material; after that, the mixed solution is evenly stirred and mixed at a certain temperature and then stands still; finally, the microemulsion is obtained until bubbles are completely removed; wherein, the surface active agent is compound of surface active agent A and surface active agent B, the HLB values of which are respectively 1-10 and 11-20; the weight ratio between the surface active agent A and the surface active agent B is 1:1.5-4.5, and the HLB value is 8-18 after being compounded. The obtained microemulsion is a stable system of thermodynamics, has transparent appearance, and does not have the phenomenon of phase splitting and emulsion breaking caused by a plurality of times of phase transition process due to the actions such as a plurality of times of freeze thawing, centrifugal separation and the like, thereby fundamentally overcoming the defect of poor stability of conventional emulsion and being long in service life.

Description

technical field [0001] The invention relates to a method for preparing a microemulsion with a phase change energy storage function. The microemulsion prepared by the method is an oil-in-water (O / W) microemulsion, and the oil phase is an organic phase change energy storage material. Background technique [0002] Phase Change Materials (Phase Change Materials, PCMS) is a special functional material, which can change the phase state of matter at a specific temperature or temperature range (phase change temperature), and absorb or release energy along with the phase change process. A large amount of latent heat of phase change, so it can be used for heat storage or cold storage. Compared with sensible heat energy storage, phase change energy storage has the characteristics of high energy storage density, approximately isothermal energy storage and discharge, and easy control of the process, which is very suitable for solving the problem of imbalance between energy supply and dem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 马素德唐国翌
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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