Polyurea-melamin resin double-wall material cetane microcapsule and preparation method thereof

A technology of melamine resin and hexadecane, which is applied in the field of preparation of microcapsules of phase change materials, can solve the problems of insufficient density and strength of microcapsule wall materials, and achieve enhanced impermeability, good thermal stability, and encapsulation high degree of performance

Active Publication Date: 2009-10-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The present invention aims at the disadvantages of insufficient compactness and strength of microcapsule wall materials existing in the prior art, and provides a preparation method of polyurea-melamine resin double-wall material hexadecane microcapsules, and the prepared microcapsules are dense Good resistance, high strength, high core material content, good particle size distribution

Method used

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  • Polyurea-melamin resin double-wall material cetane microcapsule and preparation method thereof
  • Polyurea-melamin resin double-wall material cetane microcapsule and preparation method thereof
  • Polyurea-melamin resin double-wall material cetane microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Mix 10g n-hexadecane and 1g toluene-2,4-diisocyanate thoroughly and add them to an Erlenmeyer flask containing 70g deionized water, 0.6g sodium lauryl sulfate and 0.5g OP emulsifier, at 50°C Next, emulsify on a high-shear emulsifier at a speed of 10000r / min for 15min to make a hexadecane emulsion and transfer it into a 250ml three-necked bottle;

[0042] 1.5g of ethylenediamine was prepared into a 10%wt solution, and added dropwise to the hexadecane emulsion at a rate of 0.4ml / min in a water bath at a stirring speed of 300r / min and 50°C. The reaction was carried out at ℃ for 2h to obtain a suspension of hexadecane microcapsules with a single-layer shell material.

[0043] Add 10g of melamine to a three-necked bottle containing 20g of 37%wt formaldehyde solution and 40g of distilled water, adjust the pH to 8-9 with 10%wt of triethanolamine, and stir at 200r / min at 70℃ until transparent and viscous Like liquid to obtain melamine resin prepolymer.

[0044] At a stirring speed ...

Embodiment 2

[0046] Mix 10g n-hexadecane and 1.5g toluene-2,4-diisocyanate thoroughly and add them to an Erlenmeyer flask containing 70g of deionized water, 0.5g of sodium lauryl sulfate and 0.5g of OP emulsifier. Emulsify on a high-shear emulsifier at 8000r / min for 10min to make a hexadecane emulsion and transfer it into a 250ml three-necked bottle;

[0047] Prepare 2.0g ethylenediamine into a 10%wt solution, add it dropwise to the hexadecane emulsion at a rate of 0.3ml / min in a water bath at a stirring speed of 400r / min and 50°C. The reaction was carried out at ℃ for 2h to obtain a suspension of hexadecane microcapsules with a single-layer polyurea shell material.

[0048] Add 10g of melamine to a three-necked flask containing 20g of 37%wt formaldehyde solution and 40g of distilled water, adjust the pH to 8-9 with 10%wt of triethanolamine, and stir at 100r / min at 70℃ until transparent and viscous Like liquid to obtain melamine resin prepolymer.

[0049] Under a stirring speed of 200r / min, 18...

Embodiment 3

[0051] Mix 10g n-hexadecane and 1.3g toluene-2,4-diisocyanate thoroughly and add them to an Erlenmeyer flask containing 70g of deionized water, 0.55g of sodium lauryl sulfate and 0.45g of OP emulsifier. Emulsify on a high-shear emulsifier at a temperature of 9000r / min for 12min to make a hexadecane emulsion and transfer it into a 250ml three-necked bottle;

[0052] 1.7g of ethylenediamine was formulated into a 10%wt solution, and added dropwise to the hexadecane emulsion at a rate of 0.3ml / min in a water bath at a stirring speed of 350r / min and 50℃. The reaction was carried out at ℃ for 2h to obtain a suspension of hexadecane microcapsules with a single-layer shell material.

[0053] Add 10g of melamine to a three-necked flask containing 20g of 37%wt formaldehyde solution and 40g of distilled water, adjust the pH to 8-9 with 10%wt of triethanolamine, and stir at 100r / min at 70℃ until transparent and viscous Like liquid to obtain melamine resin prepolymer.

[0054] Under a stirring...

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Abstract

The invention provides a method for preparing polyurea-melamin resin double-wall material cetane microcapsule, which comprises: first, toluene-2, 4- vulcabond and quadrol are adopted to synthesize inner layer shell material of the cetane microcapsule by an interfacial polymerization method, and then melamin resin performed polymer is adopted to synthesize outer layer shell material of the cetane microcapsule by an in-situ polymerization method, so that the polyurea-melamin resin double-wall material cetane microcapsule can be prepared. More particularly, the method comprises: hexadecane and the toluene-2, 4- vulcabond are fully mixed together and then added into the mixture of de-ionized water, sodium dodecyl sulfate and polyethylene glycol nonylphenyl ether to be emulsified to obtain cetane emulsified liquid; then, the mixed quadrol solution is dripped into the cetane emulsified liquid to react to obtain polyurea monolayer shell material microcapsule; finally, the polyurea monolayer shell material microcapsule reacts with the melamin resin performed polymer to obtain the polyurea-melamin resin double-wall material cetane microcapsule. The prepared microcapsule has good compactness, high strength and core content and excellent particle size distribution.

Description

Technical field [0001] The invention belongs to the field of material preparation, and particularly relates to a method for preparing a phase change material microcapsule with a composite wall material. Background technique [0002] Phase change material refers to a material that can absorb or release a large amount of heat during the phase change process and maintain a relatively stable temperature during the process. Due to the high latent heat of the phase change material, the temperature change is small during the phase change process, so this feature can be used to control the change of the surrounding environment temperature. However, phase change materials produce liquids in the process of solid-liquid phase change, and many types of phase change materials have problems such as poor thermal conductivity and large volume changes during phase change. Therefore, phase change materials must be encapsulated in order to be more effective. Take advantage of it. The phase change m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02C08G18/76C08G18/32
Inventor 钱春香高桂波
Owner SOUTHEAST UNIV
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