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Preparation method of phase change microcapsule with graphene-modified wall material

A graphene modification, phase change microcapsule technology, applied in microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problems of low thermal conductivity and high graphene permeability, and achieve low leakage rate , the effect of improving thermal conductivity

Inactive Publication Date: 2015-08-26
SOUTHWEAT UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these methods ideally use graphene to solve the current problems of high permeability and low thermal conductivity of phase change microcapsules.

Method used

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  • Preparation method of phase change microcapsule with graphene-modified wall material

Examples

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Effect test

Embodiment 1

[0032] Preparation of Unmodified Melamine Resin Phase Change Microcapsules

[0033] (1) Preparation of prepolymer

[0034] Weigh 4.0 g of melamine and 8.5 g of 37% formaldehyde solution, add 15 mL of distilled water, adjust the pH to 9 with triethanolamine, and stir for 50 min at 70° C. to obtain a melamine-formaldehyde resin prepolymer.

[0035] (2) Emulsification of phase change materials

[0036] Weigh 5.0 g of styrene-maleic anhydride copolymer (SMA) and 1.0 g of NaOH, add 250 mL of distilled water, heat to dissolve, and obtain an emulsifier solution. Add 40 g of paraffin with a melting point of 42° C., adjust the pH of the system to 4.5 with citric acid, and heat at 70° C. to melt the paraffin. Then emulsify in a high-shear emulsifier, the emulsification conditions are: rotation speed 3000r / min, emulsification time 10min, to obtain paraffin wax emulsion.

[0037] (3) Preparation of phase change microcapsules

[0038] Under the condition of stirring in a water bath at ...

Embodiment 2

[0040] Preparation of graphene-modified melamine resin phase change microcapsules

[0041] (1) Preparation of graphene oxide solution

[0042] Weigh 25.0 mg of graphite oxide, add 50.0 mL of deionized water, stir, and sonicate for 1 h to prepare a 0.5 mg / mL graphene oxide solution.

[0043] (2) Preparation of graphene modified wall material prepolymer

[0044] Weigh 4.0g of melamine and 8.5g of formaldehyde solution with a concentration of 37%, add 15mL of distilled water, adjust the pH to 9 with triethanolamine, stir and react at 70°C for 30min, then add 8mL of graphene oxide solution with a concentration of 0.5mg / mL (the added mass of graphene oxide accounts for 1‰ of the mass of melamine) to continue the reaction for 20 minutes to obtain a graphene-modified melamine-formaldehyde resin prepolymer.

[0045](3) Emulsification of phase change materials

[0046] Weigh 5.0 g of styrene-maleic anhydride copolymer (SMA) and 1.0 g of NaOH, add 250 mL of distilled water, heat to d...

Embodiment 3

[0050] Preparation of graphene-modified urea-formaldehyde resin phase change microcapsules

[0051] (1) Preparation of graphene oxide solution

[0052] Weigh 50.0 mg of graphite oxide, add 50 mL of deionized water, stir, and sonicate for 1 h to prepare a 1 mg / mL graphene oxide solution.

[0053] (2) Preparation of graphene modified wall material prepolymer

[0054] Weigh 4.5g of urea and 8.5g of formaldehyde solution with a concentration of 37%, add 15mL of distilled water, adjust the pH to 8 with triethanolamine, stir and react at 70°C for 20min, then add 22.5mL of graphene oxide solution with a concentration of 1mg / mL (The added mass of graphene oxide accounts for 5‰ of the mass of urea) to continue the reaction for 30 minutes to obtain a graphene-modified urea-formaldehyde resin prepolymer.

[0055] (3) Emulsification of phase change materials

[0056] Weigh 5 g of styrene-maleic anhydride copolymer (SMA) and 1.0 g of NaOH, add 250 mL of distilled water, and heat to diss...

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Abstract

The invention discloses a preparation method of a phase change microcapsule with a graphene-modified wall material. The preparation method comprises the following steps: preparing a graphene oxide solution; preparing a graphene-modified wall material pre-polymer; emulsifying a phase change material; preparing the phase change microcapsule with the graphene-modified wall material. A solid-liquid phase change material serves as a core material of the phase change microcapsule prepared by using an in-situ polymerization method, and a graphene-modified polymer serves as the wall material. Compared with the prior art in which graphene is not added for modification, the preparation method in which the graphene is added into the wall material has the advantages that the heat conductivity of the phase change microcapsule is improved, and the leakage rate is lower.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a method for preparing phase-change microcapsules of graphene-modified wall materials. Background technique [0002] Solid-liquid phase change materials absorb or release heat through the transition between solid and liquid phases in a specific temperature range, so as to realize the storage and release of heat energy. Solid-liquid organic phase change materials have been widely used in phase change materials because of their good chemical stability, large latent heat of phase change, no supercooling and phase separation, wide range of sources, and low price. However, such materials are easy to flow during the phase change process, which limits their practical application, and microencapsulation of phase change materials is one of the effective methods to solve this problem. [0003] The phase change microcapsule is prepared by using the phase change mat...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/18C08G12/32C08G12/12C08G8/10C08G12/38
Inventor 杨文彬张凯张丽吴菊英范敬辉
Owner SOUTHWEAT UNIV OF SCI & TECH
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