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Silicon dioxide gel micro-encapsulated phase change energy storage material and preparation thereof

A phase change energy storage material, silicon dioxide technology, applied in microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problems of solid-liquid phase change energy storage material leakage, phase separation, easy agglomeration, etc.

Inactive 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

[0004] The purpose of the present invention is to provide a silica gel microencapsulated phase-change energy storage material and its preparation method to improve the leakage, phase separation, volume expansion, and corrosion of the solid-liquid phase-change energy storage material during use. Poor resistance and thermal stability, etc., while overcoming the disadvantages of complex operation procedures, poor weather resistance, irregular shape and easy agglomeration of microcapsules in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 50ml of deionized water and 150ml of ethanol to the reaction kettle equipped with a stirring and reflux device. After stirring evenly, add 50g of paraffin, heat and melt at 45°C, stir vigorously at 2000rpm for 10 minutes, and add concentrated ammonia water to make the reaction The pH value of the system is 9-10, then slowly add 5g of organosilicon oxide compound dropwise at a rate of 3ml / min, stir and react for 150min, then lower the reaction kettle to room temperature, filter, wash, and put the filter cake under the conditions of 120°C and 30mmHg Drying under the hood to obtain 51.9 g of a product with good fluidity.

[0016] The latent heat of phase change of the product obtained is 98.7J / 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 13.8 μm; -1 The characteristic peaks of silica gel are shown, while the characteristic peaks of paraffin basically disappear. This shows t...

Embodiment 2

[0019] Add 50ml of deionized water and 150ml of ethanol to the reaction kettle equipped with a stirring and reflux device. After stirring evenly, add 50g of paraffin, heat and melt at 45°C, stir vigorously at 2000rpm for 10 minutes, and add concentrated ammonia water to make the reaction The pH value of the system is 10-11, then slowly add 5g of organosilicon oxide compound dropwise at a rate of 8ml / min, stir and react for 150min, then lower the reaction kettle to room temperature, filter and wash the filter cake at 120°C and 30mmHg Drying under the hood to obtain 52.6 g of a product with good fluidity.

[0020] The latent heat of phase change of the product obtained is 103.4J / 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 19.4 μm; -1 The characteristic peaks of silica gel are shown, while the characteristic peaks of paraffin basically disappear. This shows that the product obtained ...

Embodiment 3

[0022] Add 50ml of deionized water and 150ml of ethanol to a reaction kettle equipped with a stirring and reflux device. After stirring evenly, add 100g of paraffin, heat and melt at 45°C, stir vigorously at 2000rpm for 10 minutes, and add concentrated ammonia water to make the reaction The pH value of the system is 8-9, then slowly add 10g of organosilicon oxide compound dropwise at a rate of 5ml / min, stir and react for 150min, then lower the reaction kettle to room temperature, filter, wash, and put the filter cake under the conditions of 120°C and 30mmHg Drying at 8°C gave the product 103.6 with good flowability.

[0023]The latent heat of phase change of the product obtained is 110.6J / 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 30.4 μm; -1 The characteristic peaks of silica gel are shown, while the characteristic peaks of paraffin basically disappear. This shows that the produ...

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Abstract

The invention discloses a silicon dioxide gel 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 ethanol water solution at a temperature of between 30 and 90 DEG C, emulsifying under high-speed stirring, adding alkaline solution to ensure that the pH value of a reaction system is between 8 and 12, dropwise adding organic silicon oxide which accounts for 5 to 30 percent of the weight of the phase change energy storage material at a speed of between 1.5 and 8ml / m, reacting for 2 to 4 hours, and cooling, filtering and drying to obtain a micro-capsule which takes silicon dioxide gel produced by the organic silicon oxide under alkaline condition as a capsule wall and the emulsified phase change energy storage material as a capsule core, wherein the weight ratio of the phase change energy storage material to the organic silicon oxide is 2.3-19: 1. The obtained product has the average particle size not obviously increased, good free mobility of particles and compact and even capsule wall, and can be applied in the fields of energy utilization, heat exchange and temperature control.

Description

Technical field: [0001] The invention belongs to the technical field of functional composite materials, in particular to a silica gel microencapsulated phase change energy storage material and a preparation method thereof. Background technique: [0002] According to the Dutch "Solar Energy" (Solar Energy, 2006, 80(12): 1561-1567.), microencapsulated phase change materials are the use of microencapsulation technology to combine solid-liquid phase change materials with synthetic polymer materials or inorganic compounds. Or chemically coated solid particles that are stable under normal conditions. This kind of solid particles can absorb or release considerable latent heat of phase change within a narrow temperature range, and has a more significant heat storage and temperature regulation function. By selecting an appropriate capsule The material can effectively improve the problems of leakage, phase separation, volume expansion, corrosiveness, and poor thermal stability of phas...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/02
Inventor 胡源倪健雄宋磊
Owner UNIV OF SCI & TECH OF CHINA
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