Double shell microcapsule phase change material with paraffin compound as core and its preparing process

A technology of phase change materials and microcapsules, applied in the direction of microcapsule preparation, microsphere preparation, heat exchange materials, etc., can solve the problems of high price of pure linear alkanes, restrictions on large-scale use, strict compatibility requirements, etc. , to achieve the effects of dense packaging, increased service life, and increased use range

Inactive Publication Date: 2007-06-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has strict requirements on the compatibility of the core material with isocyanate, etc., and it is pointed out in the text that "the optional polyisocyanate and polypropylene glycol should all be solubl

Method used

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  • Double shell microcapsule phase change material with paraffin compound as core and its preparing process
  • Double shell microcapsule phase change material with paraffin compound as core and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Dissolve 0.3g of polypropylene glycol with a molecular weight of 2000 and 1.7g of TDI in 3.5g of cyclohexane, and dissolve with 20g of paraffin wax at 65°C.

[0040] 2. Add the above-mentioned core material solution into 60 g of deionized water containing 3.2 g of polyacrylic acid sodium salt with a molecular weight of 100,000, and emulsify for 15 minutes at 65° C. and 6,000 r / min to obtain a core material emulsion.

[0041] 3. Transfer the core material emulsion to a three-necked flask, add 10 g of an aqueous solution containing 0.8 g of ethylenediamine dropwise under the conditions of 65 ° C and 350 r / min, drop it in 20 minutes, and keep it warm for 1.5 hours.

[0042] 4. Add 2.4g of melamine and 4.2g of formaldehyde aqueous solution into deionized water, adjust the pH value to 7-8, raise the temperature to 70°C, and stir until the solution is transparent to obtain a melamine-formaldehyde prepolymer.

[0043] 5. Add the melamine-formaldehyde resin prepolymer into t...

Embodiment 2

[0046]1. Dissolve 0.3g of polypropylene glycol with a molecular weight of 2000 and 1.6g of HDI in 3.3g of cyclohexane, and dissolve with 20g of n-octadecane at 65°C.

[0047] 2. Add the above-mentioned core material solution into 60 g of deionized water containing 3.2 g of polyacrylic acid sodium salt with a molecular weight of 150,000, and emulsify for 15 minutes at 35° C. and 7,000 r / min to obtain a core material emulsion.

[0048] 3. Transfer the core material emulsion to a three-necked flask, add 10 g of an aqueous solution containing 0.8 g of ethylenediamine dropwise under the conditions of 35 ° C and 350 r / min, drop it in 20 minutes, and keep it warm for 1.5 hours.

[0049] 4. Add 2.4g of melamine and 4.2g of formaldehyde aqueous solution into deionized water, adjust the pH value to 7-8, raise the temperature to 70°C, and stir until the solution is transparent to obtain a melamine-formaldehyde prepolymer.

[0050] 5. Add the melamine-formaldehyde resin prepolymer into th...

Embodiment 3

[0053] 1. Dissolve 0.35g of polypropylene glycol with a molecular weight of 2500 and 1.8g of TDI in 3.5g of cyclohexane, and co-dissolve with 20g of n-nonadecane at 38°C.

[0054] 2. Add the above-mentioned core material solution to 60 g of deionized water containing 3.6 g of polystyrene-maleic anhydride sodium salt with a molecular weight of 2,000,000, and emulsify for 20 minutes at 38° C. and 6,000 r / min to obtain a core material emulsion.

[0055] 3. Transfer the core material emulsion to a three-necked flask, add 10 g of an aqueous solution containing 0.7 g of ethylenediamine dropwise under the conditions of 38 ° C and 350 r / min, drop it in 20 minutes, and keep it warm for 1.5 hours.

[0056] 4. Add 2.4 g of melamine and 4.2 g of formaldehyde aqueous solution into deionized water, adjust the pH value to 7-8, raise the temperature to 80° C., and stir until the solution is transparent to obtain a melamine-formaldehyde prepolymer.

[0057] 5. Add the melamine-formaldehyde res...

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Abstract

The present invention discloses double shell microcapsule phase change material with paraffin compound as core and its preparation process. The double shell microcapsule phase change material has core of phase change material paraffin or paraffin mixture with phase change temperature 20-70 deg.c and double polymer shell, including one inner shell of polyurea material formed through polymerizing polybasic amine, polyol and isocyanate or acyl chloride, and one outer shell formed through polymerizing melamine and formaldehyde. The double shell microcapsule phase change material has complete coating, low permeation and capacity of being used repeatedly, and may be used widely in textile, electronic industry and other fields.

Description

technical field [0001] The invention relates to a microcapsule phase-change material, in particular to a double-shell microcapsule phase-change material with paraffin compounds as core materials and a preparation method thereof. Background technique [0002] Phase change materials use the property of absorbing or releasing a large amount of heat when a substance undergoes a phase change to store heat. However, due to the solid-liquid phase transition of phase change materials during work, problems such as flow and leakage are likely to occur, which brings a lot of inconvenience to practical use. To solve these problems, microencapsulation of phase change materials is an effective method. Phase-change material microcapsules are tiny particles prepared by using polymers as wall materials and phase-change materials as core materials. It has the advantages of high heat storage temperature, small equipment size, convenient use, high thermal efficiency, and heat release is a con...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/02
Inventor 袁文辉刘都树李莉
Owner SOUTH CHINA UNIV OF TECH
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