Preparation method of paraffin-based phase change nanoemulsion

A nanoemulsion, paraffin-based technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of phase separation and poor stability, and achieve friendly properties, high stability, and low production energy consumption. Effect

Inactive Publication Date: 2018-07-24
THE HONG KONG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a production energy-saving, simple process, low cost and other defects such as poor stability of conventional phase change emulsions and possible phase separation after long-term storage or multiple thermal cycles. Preparation method of paraffin-based phase-change nanoemulsion with high emulsion stability

Method used

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  • Preparation method of paraffin-based phase change nanoemulsion
  • Preparation method of paraffin-based phase change nanoemulsion
  • Preparation method of paraffin-based phase change nanoemulsion

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preparation example Construction

[0023] The preparation method of a kind of paraffin-based phase-change nanoemulsion of the present invention comprises the following steps:

[0024] S1. Configure 10-50 parts by weight of paraffin phase change material, and then add 1-20 parts by weight of the first surfactant and no more than 5 parts by weight of co-surfactant as the first mixed solvent;

[0025] S2. Configure 25-85 parts by weight of deionized water or distilled water, and then add 1-20 parts by weight of a second surfactant as a second mixed solvent;

[0026] S3. At a temperature higher than the melting point of the paraffin phase change material but lower than 90° C. (emulsification temperature), respectively stir the first mixed solvent and the second mixed solvent to fully mix or dissolve;

[0027] S4. At the emulsification temperature in step S3, stir the first mixed solvent at a speed of 400-800 rpm, and at the same time slowly drop the second mixed solvent into the first mixed solvent to form a third ...

example 1

[0036] Weigh 9g of n-hexadecane, add 0.8g of Span 80, 3g of Brij L4, and 0.4g of n-butanol as the first mixed solvent. Weigh 16g of deionized water or distilled water, and add 0.8g of Tween 80 as the second mixed solvent. The above-mentioned first mixed solvent and second mixed solvent are fully mixed or dissolved respectively. Stir the first mixed solvent at 400rpm at a temperature of 70°C, and at the same time slowly drop the second mixed solvent into the first mixed solvent to obtain the third mixed solvent, and finally cool the third mixed solvent to 25°C to obtain the mass A phase change nanoemulsion with a fraction of 30% and a phase transition temperature of 17°C.

[0037] figure 1 It is a schematic diagram of the DSC curve of the phase-change nanoemulsion with a phase-change temperature of 16°C prepared in Example 1 using the preparation method of the present invention. The mass content of the paraffin phase change material is 30%, and the enthalpy change during the...

example 2

[0040] Weigh 18g of n-tetradecane, add 4.5g of Span 80 and 1g of n-butanol as the first mixed solvent. Weigh 35g of deionized water or distilled water, add 1.5g of Tween 80 as the second mixed solvent. The above-mentioned first mixed solvent and second mixed solvent are fully mixed or dissolved respectively. Stir the first mixed solvent at 400rpm at a temperature of 60°C, and at the same time slowly drop the second mixed solvent into the first mixed solvent to obtain the third mixed solvent, and finally cool the third mixed solvent to 0°C to obtain the mass A phase change nanoemulsion with a fraction of 30% and a phase transition temperature of 7°C.

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Abstract

The invention provides a preparation method of a paraffin-based phase change nanoemulsion. The preparation method comprises the following steps: preparing 10-50 parts of a paraffin phase change material, and then adding 1-20 parts of a first surfactant and smaller than or equal to 5 parts of a cosurfactant to obtain a first mixed solvent; preparing 25-85 parts of deionized or distilled water, andthen adding 1-20 parts of a second surfactant to obtain a second mixed solvent; at the emulsification temperature, stirring the first mixed solvent and the second mixed solvent respectively to sufficiently mix or dissolve the first mixed solvent and the second mixed solvent; at the emulsification temperature, stirring the first mixed solvent at the rotating speed of 400-800rpm, and slowly drippingthe second mixed solvent into the first mixed solvent to form a third mixed solvent; cooling the third mixed solvent to the temperature equal to the environmental temperature in an environment of 0-25 DEG C. By the preparation method, the production energy consumption is low, the technological process is simple, the cost is low, and the prepared nanoemulsion is high in stability.

Description

technical field [0001] The invention relates to a preparation method of a microemulsion with a phase change energy storage function, more specifically, a preparation method of a paraffin-based phase change nanoemulsion. Background technique [0002] Phase change material (Phase Change Material, PCM) means that in the process of its phase change, it can exchange energy with the external environment (absorb heat from the external environment or release heat to the external environment), so as to control the environmental temperature and utilize Materials for energy purposes. Phase change functional fluid (Phase Change Slurry, PCS) is a multiphase fluid composed of phase change material particles and single-phase heat transfer fluid water, because it can improve the fluidity, thermal conductivity and Volume change and other issues have become one of the research hotspots in the field of energy storage materials. [0003] Common phase change functional fluids include ice slurr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C09K5/06C09K5/063
Inventor 牛建磊吴建勇张希尧
Owner THE HONG KONG POLYTECHNIC UNIV
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