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Micro-capsulation method of phase-change material and obtained microcapsule and uses thereof

A technology of phase change materials and microcapsules, applied in microcapsule preparations, chemical instruments and methods, colloid chemistry, etc., and can solve the problem of not granting patents, etc.

Inactive Publication Date: 2009-05-20
UNIV DE CASTILLA LA MANCHA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This PCM encapsulation method has not previously been described in the literature nor patented

Method used

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  • Micro-capsulation method of phase-change material and obtained microcapsule and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Microencapsulated paraffin wax with polystyrene

[0088] Paraffin-containing polystyrene microcapsules were prepared using the following reactants in the following ratios:

[0089] Formulation of the continuous phase (reaction vessel)

[0090] Polyvinylpyrrolidone 7.4g

[0091] Water (MIIIi-Q) 754g

[0092] Formulation of the discontinuous phase (bath II)

[0093] Paraffin 54g

[0094] Dibenzoyl peroxide 2.5g

[0095] Styrene 156g

[0096] program

[0097] 1. Prepare the continuous phase in a reaction vessel by adding water and stabilizer in the prescribed proportions. Stir gently (200 rpm) for 10 minutes.

[0098] 2. Prepare the discontinuous phase by adding styrene, paraffin and initiator in bath II.

[0099] 3. Disperse Bath II in the reaction vessel at 100°C under vigorous stirring.

[0100] 4. During all reactions the reaction vessel had to be inerted and the reaction was carried out for 6 hours.

[0101] Microscopic observation of the samples showed ...

Embodiment 2

[0104] Paraffin wax was microencapsulated with poly(styrene-co-methyl methacrylate).

[0105] Paraffin-containing poly(styrene-co-methyl methacrylate) microcapsules were prepared using the following reactants in the following ratios:

[0106] Formulation of the continuous phase (reaction vessel)

[0107] Polyvinylpyrrolidone 7.4g

[0108] Water (MIIIi-Q) 754g

[0109] Formulation of the discontinuous phase (bath II)

[0110] Paraffin 78g

[0111] Dibenzoyl peroxide 2.5g

[0112] Styrene 45g

[0113] Methyl methacrylate 189g

[0114] program

[0115] 1. Prepare the continuous phase in a reaction vessel by adding water and stabilizer in the prescribed proportions. Stir gently (200 rpm) for 10 minutes.

[0116] 2. Prepare the discontinuous phase by adding styrene, methyl methacrylate, paraffin and initiator in bath II.

[0117] 3. Disperse Bath II in the reaction vessel at 100°C under vigorous stirring.

[0118] 4. During all reactions the reaction vessel had to ...

Embodiment 3

[0122] Polyethylene glycol microencapsulated with polystyrene

[0123] Polystyrene microcapsules containing polyethylene glycol (PEG600, freezing point 20-25° C.) were prepared using the following reactants in the following proportions:

[0124] Formulation of the continuous phase (reaction vessel)

[0125] Polyvinylpyrrolidone 7.4g

[0126] Water (Milli-Q) 754g

[0127] Formulation of the discontinuous phase (bath II)

[0128] PEG 600 54g

[0129] Dibenzoyl peroxide 2.5g

[0130] Styrene 156g

[0131] program

[0132] 1. Prepare the continuous phase in a reaction vessel by adding water and stabilizer in the prescribed proportions. Stir gently (200 rpm) for 10 minutes.

[0133] 2. Prepare the discontinuous phase by adding styrene, polyethylene glycol and initiator in bath II.

[0134] 3. Disperse Bath II in the reaction vessel at 110°C under vigorous stirring.

[0135] 4. During all reactions the reaction vessel had to be inerted and the reaction was carried ou...

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Abstract

The invention relates to a process for microencapsulation of phase change materials based on free radicals polymerization comprising: a) the preparation of i) a solution with, at least, a hydrophilic liquid and a stabilizer (continuous phase) and ii) a solution with, at least, a phase change material, a free radical initiator and a polymerizable material (discontinuous phase); b) the preparation of an emulsion by dispersing the discontinuous phase in the continuous phase under vigorous stirring; and c) the polymerization of monomers until the phase change material becomes microencapsulated. This process is simple and effective and avoids the use of hazardous compounds. The invention also relates to microcapsules obtainable by said process and to the use thereof in the thermal protection and storage of heat.

Description

technical field [0001] The present invention relates to microencapsulation of phase change materials. More particularly, it relates to a method of microencapsulating phase change materials based on free radical polymerization and the resulting microcapsules. Background technique [0002] The active agent deposited inside the microcapsules is a phase change material (also called PCM) and it is the main player in thermal energy storage. PCM is a material with a high heat of fusion. They can absorb or release latent heat when the temperature of the material undergoes or passes through a phase transition temperature. The thermal properties of the various phase change materials available are well known, these materials are already available in the market (hydrated salts, paraffins or waxes, organic, inorganic and fatty acids) and they can be encapsulated by a polymeric covering. [0003] The storage media employed hitherto in latent heat storage systems are generally substance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/24F28D20/02B01J13/00C09K5/00
CPCC08F2/20B01J13/14C09K5/063C08F2/24
Inventor J·F·罗德里格斯罗梅罗M·L·桑切斯席尔瓦P·桑切斯帕雷德斯A·德卢卡斯马丁内斯M·L·托里斯巴雷托
Owner UNIV DE CASTILLA LA MANCHA
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