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Preparation method of polyurethane (PU) nano-encapsulated phase-change material (NEPCM)

A technology of phase change materials and nanocapsules, which is applied in the field of preparation of polyurethane nanocapsule phase change materials, can solve the problems of suspension rheological interference, dilution stability and poor redispersibility, and achieve good elasticity and mechanical strength, good weight The effect of dispersibility and simple preparation process

Inactive Publication Date: 2011-09-28
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Nanocapsules can be obtained by combining in-situ polymerization, interfacial polymerization with miniemulsion or high-speed shear technology, but these preparation methods have some shortcomings, and all need to add emulsifiers to be stably dispersed in water, dilution stability and heavy weight. The dispersibility is poor, and the small molecule emulsifier will also cause some interference to the rheology of the suspension

Method used

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  • Preparation method of polyurethane (PU) nano-encapsulated phase-change material (NEPCM)
  • Preparation method of polyurethane (PU) nano-encapsulated phase-change material (NEPCM)

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1. Preparation of amphiphilic polyurethane.

[0026] Mix a certain amount of toluene diisocyanate, polytetrahydrofuran diol and organotin catalyst dibutyltin dilaurate, react at a certain temperature for a period of time, add dimethylol propionic acid, and finally add β-hydroxyethyl methacrylate to seal end, resulting in amphiphilic polyurethane. The reaction is carried out in a nitrogen atmosphere, and the raw material composition mass fraction of amphiphilic polyurethane is as follows:

[0027] Toluene diisocyanate 100

[0028] Polytetrahydrofuran diol 77

[0029] Dimethylolpropionic acid 44

[0030] β-Hydroxyethyl Methacrylate 58

[0031] Dibutyltin dilaurate 0.4

[0032] Second, the preparation of emulsion.

[0033] A certain amount of amphiphilic polyurethane is taken, and a certain amount of phase change material polytetrahydrofuran (molecular weight greater than 2000) and deionized water are added in proportion. Use a high-shear dispersing emulsifier at 10...

Embodiment 2

[0041] 1. Preparation of amphiphilic polyurethane.

[0042] Mix a certain amount of toluene diisocyanate, glycerol allyl ether and dibutyltin dilaurate, react at a certain temperature for a period of time, add dimethylol butyric acid / acetone solution, and finally add 1-dodecanol After the reaction, the acetone was distilled off to obtain amphiphilic polyurethane. The reaction is carried out in a nitrogen atmosphere, and the raw material composition mass fraction of amphiphilic polyurethane is as follows:

[0043] Toluene diisocyanate 100

[0044] Glycerol Allyl Ether 25

[0045] Dimethylolbutyrate 52

[0046] 1-Dodecanol 58

[0047] Dibutyltin dilaurate 0.3

[0048] Second, the preparation of emulsion.

[0049] Take a certain amount of amphiphilic polyurethane, add a certain amount of solid paraffin and tripropylene glycol acrylate in proportion, heat and mix, and then add deionized water. Use a high-shear dispersing emulsifier at 10000r / min to emulsify to obtain a unif...

Embodiment 3

[0058] 1. Preparation of amphiphilic polyurethane.

[0059] Mix a certain amount of toluene diisocyanate, glycerol allyl ether and dibutyltin dilaurate, react at a certain temperature for a period of time, add dimethylol butyric acid / acetone solution, and finally add 1-dodecanol After the reaction, the acetone was distilled off to obtain amphiphilic polyurethane. The reaction is carried out in a nitrogen atmosphere, and the raw material composition mass fraction of amphiphilic polyurethane is as follows:

[0060] Toluene diisocyanate 100

[0061] Glycerol Allyl Ether 23

[0062] Dimethylolbutyrate 46

[0063] 1-Dodecanol 58

[0064] Dibutyltin dilaurate 0.3

[0065] Second, the preparation of emulsion.

[0066] Take a certain amount of amphiphilic polyurethane, add a certain amount of methyl stearate and tripropylene glycol acrylate in proportion, heat and mix, and then add deionized water. Use a high-shear dispersing emulsifier at 10000r / min to emulsify to obtain a unifo...

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Abstract

The invention relates to a method for preparing nano-encapsulated phase-change material (NEPCM) by taking amphiphilic polyurethane (PU) or a composite amphiphilic PU material as a capsule wall without adding an emulsifier. The method comprises the following steps: dispersing PCM and a small quantity of vinyl monomers by utilizing the amphiphilic PU; and then chemically cross-linking the PU capsule wall through emulsion polymerization initiated by free radicals to finally obtain the NEPCM. By utilizing the novel method for preparing the NEPCM provided by the invention, the obtained nano-capsules have good dispersion stability and good re-dispersibility and average particle size of 50nm-800nm, wherein a core material accounts for 1%-80% of the weight of one capsule. In addition, the NEPCM can be used in latent functionally thermal fluid in the form of suspension, and can be compounded with other materials in the form of powder so as to achieve a thermoregulation function.

Description

technical field [0001] The invention relates to a preparation method of a nanocapsule phase change material with amphiphilic polyurethane and its composite material as the capsule wall. The suspension can be used as a functional thermal fluid, and the powder can be compounded with other materials to make it have Temperature adjustment function. Background technique [0002] Microcapsules and nanocapsules wrapped with phase change materials are called nanocapsule phase change materials and microcapsule phase change materials. The particle size of microcapsules is usually between 1 and 1000 μm, and capsules smaller than 1 μm are called nanocapsules. The shells of nanocapsule phase change materials and microcapsule phase change materials are mostly polymer materials, such as urea-formaldehyde resin, melamine-formaldehyde resin, polyurea, polyurethane, polystyrene, polymethacrylate, etc. It can be applied in the form of water or silicone oil emulsion or suspension, such as: lat...

Claims

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Application Information

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IPC IPC(8): B01J13/14C08L75/04C08L51/08
Inventor 魏燕彦
Owner QINGDAO UNIV OF SCI & TECH
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