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Aqueous polyurethane micro-encapsulated phase change energy storage material and preparation thereof

A phase-change energy storage material, water-based polyurethane technology, applied in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of complex operation procedures, fragile microcapsules, phase separation and other problems

Active Publication Date: 2009-08-12
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a metal ion cross-linked water-based polyurethane microencapsulated phase change energy storage material and its preparation method to improve the leakage, phase separation, volume expansion, There are problems such as corrosiveness and poor thermal stability, and at the same time overcome the shortcomings of the prior art such as complex operation procedures and easy breakage of microcapsules

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In a reaction kettle equipped with a stirring and reflux device, add 150ml of deionized water, 50g of paraffin and 1g of alkylphenol polyoxyethylene ether, heat to 45°C and melt, stir vigorously at 2000rpm for 10 minutes, add heavy Average molecular weight is 17 grams of waterborne polyurethane (solid content is 30wt%, pH value is 7.5) of 20000, stirs 10 minutes, then adds the saturated aqueous solution that contains 9.56 grams of aluminum nitrate, continues to stir 1.5 hours, then is down to room temperature, filters, and The filter cake was dried at 80°C for 4 hours to obtain 47 g of product.

[0015] The latent heat of phase change of the product obtained is 138.5.4J / g, which is much lower than the latent heat of phase change (225.9J / g) of paraffin; the average particle diameter of the product obtained is 5.2 μm; -1 The characteristic peak of polyurethane is shown, and the metal ion complexation peak also appears at the same time, and the characteristic peak of paraf...

Embodiment 2

[0017] Add 150ml of deionized water, 50g of paraffin and 0.5g of alkylphenol polyoxyethylene ether into a reaction kettle equipped with a stirring and reflux device. After heating to 45°C and melting, stir vigorously at 2000rpm for 10 minutes, then add heavy Average molecular weight is 17 grams of waterborne polyurethane (solid content is 30wt%, pH value is 7.5) of 20000, stirs 10 minutes, then adds the saturated aqueous solution that contains 9.56 grams of aluminum nitrate, continues to stir 1.5 hours, then is down to room temperature, filters, and The filter cake was dried at 80°C for 4 hours to yield 46.9 g of product.

[0018] The latent heat of phase change of the product obtained is 140.3J / g, which is much lower than the latent heat of phase change (225.9J / g) of paraffin; the average particle diameter of the product obtained is 8.1 μ m; -1 The characteristic peak of polyurethane is shown, and the metal ion complexation peak also appears at the same time, and the characte...

Embodiment 3

[0021] Add 150ml of deionized water, 50g of paraffin and 0.5g of alkylphenol polyoxyethylene ether into a reaction kettle equipped with a stirring and reflux device. After heating to 45°C and melting, stir vigorously at 2000rpm for 10 minutes, then add heavy Average molecular weight is 20000 waterborne polyurethane (solid content is 30wt%, pH value is 7.5) 17 grams, stirs 10 minutes, then adds the saturated aqueous solution that contains 9.56 grams of aluminum nitrates, slowly warms up to 90 ℃ and stirs 1.5 hours, then cools down to room temperature , filtered, and the filter cake was dried at 80° C. for 4 hours to obtain 44.8 g of the product.

[0022] The latent heat of phase change of the product obtained is 137.6J / g, which is much lower than the latent heat of phase change (225.9J / g) of paraffin; the average particle diameter of the product obtained is 6.8 μm; -1 The characteristic peak of polyurethane is shown, and the metal ion complexation peak also appears at the same ...

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Abstract

The invention discloses a metal ion crosslinked aqueous polyurethane microencapsulated phase change energy storage material and a preparation method thereof. The preparation method is characterized by comprising the following steps: melting a phase change energy storage material in deionized water at a temperature of between 30 and 90 DEG C, adding a nonionic surfactant which accounts for 0.5 to 10 percent of the weight of the phase change energy storage material, emulsifying under high-speed stirring, then adding aqueous polyurethane with the polyurethane content which accounts for 0.5 to 20 percent of the phase change energy storage material and metal salt water solution with the metal ion weight which accounts for 0.1 to 10 percent of the polyurethane in the aqueous polyurethane, reacting for 0.5 to 4 hours, and cooling, filtering and drying to obtain a phase change energy storage material micro-capsule which takes the phase change energy storage material as a capsule core and metal ion crosslinked aqueous polyurethane as a capsule wall, wherein the weight ratio of the phase change energy storage material to the aqueous polyurethane is 0.5-20: 1. The product has the average particle size not obviously increased, good free mobility of particles and compact and even capsule wall.

Description

Technical field: [0001] The invention belongs to the technical field of functional composite materials, in particular to a metal ion crosslinked waterborne polyurethane microencapsulated phase change energy storage material and a preparation method thereof. Background technique: [0002] According to the Dutch "Energy Conversion and Management" (Energy Conversion and Management, 2004, 45(2): 263), microencapsulated phase change energy storage materials are solid-liquid phase change materials made of polymer materials or Inorganic compounds are coated with physical or chemical methods to make stable solid particles. Microencapsulated phase change energy storage materials can not only effectively increase the heat conduction area, reduce the reaction between phase change energy storage materials and the external environment, but also can Control the volume change of the material when the phase change occurs, and improve the leakage, phase separation, volume expansion, corrosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/14
Inventor 胡源倪健雄宋磊
Owner UNIV OF SCI & TECH OF CHINA
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