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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, smooth and dense surface, and thermal stability sex good effect

Active Publication Date: 2011-05-18
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 of n-hexadecane and 1g of toluene-2,4-diisocyanate thoroughly and add them to a conical flask containing 70g of deionized water, 0.6g of sodium lauryl sulfate and 0.5g of OP emulsifier, at 50°C Next, emulsify on a high-shear emulsifier with a rotating speed of 10000r / min for 15min to make a hexadecane emulsion and move it into a 250ml three-necked bottle;

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

[0043] Add 10g of melamine into 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 triethanolamine, stir at 200r / min at 70°C until transparent and viscous liquid to obtain a melamine resin prepolymer.

[0044] At a stirr...

Embodiment 2

[0046] After fully mixing 10g n-hexadecane and 1.5g toluene-2,4-diisocyanate, add it to the conical flask filled with 70g deionized water, 0.5g sodium lauryl sulfate and 0.5g OP emulsifier, 50 Emulsify on a high-shear emulsifier at a speed of 8000r / min for 10min at ℃ to make a hexadecane emulsion and transfer it into a 250ml three-necked bottle;

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

[0048] Add 10g of melamine into 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 triethanolamine, stir at 100r / min at 70°C until transparent and viscous liquid to obtain a melamine resin prepolymer.

[0049] At a stirring speed ...

Embodiment 3

[0051] After fully mixing 10g n-hexadecane and 1.3g toluene-2,4-diisocyanate, add in the conical flask filled with 70g deionized water, 0.55g sodium lauryl sulfate and 0.45g OP emulsifier, 50 Emulsify on a high-shear emulsifier at a speed of 9000r / min for 12 minutes at ℃ to make a hexadecane emulsion and transfer it into a 250ml three-necked bottle;

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

[0053] Add 10g of melamine into 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 triethanolamine, stir at 100r / min at 70°C until transparent and viscous liquid to obtain a melamine resin prepolymer.

[0054] At a stirring speed of 220r / min...

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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, in particular to a preparation method of phase change material microcapsules with composite wall materials. Background technique [0002] Phase change materials refer to materials 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 generate liquid during the solid-liquid phase transition process, and many types of phase change materials have problems such as poor thermal conductivity and large volume changes during phase transitions. Therefore, phase change materials must be packaged to be more effective. Take advantage of it. Phase change material micro...

Claims

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Application Information

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