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Preparation method of modified aerosil-based composite phase-change material

A technology of composite phase change materials and silica, applied in chemical instruments and methods, heat exchange materials, colloid chemistry, etc., can solve problems such as limited practical application and high cost, and achieve improved load capacity, service life, and cycle time Short, simple process effect

Inactive Publication Date: 2015-12-30
南京逸柔蒂雯新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional silica aerogels usually require supercritical methods to dry, which is expensive and limits their practical applications.

Method used

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  • Preparation method of modified aerosil-based composite phase-change material
  • Preparation method of modified aerosil-based composite phase-change material
  • Preparation method of modified aerosil-based composite phase-change material

Examples

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Effect test

Embodiment 1

[0027] 3-aminopropyltrimethoxysilane, terephthalaldehyde, 0.2molL -1 The hydrochloric acid solution and absolute ethanol were mixed at a molar ratio of 1:0.33:20:0.4, stirred at room temperature for 20 minutes to mix evenly, and the above solution was sealed and stored at 40°C for 12 hours to form a gel. Then, the excess ethanol / water mixture was removed from the obtained gel, soaked in an appropriate amount of absolute ethanol, and kept at 40° C. for 24 hours to remove residual chemical substances. Repeat this 2 times. Then, the temperature was raised to 80° C. under a program with a heating rate of 1° C. / min, and the modified nanoporous silica airgel was obtained after drying under normal pressure for 36 hours.

[0028] Dissolve 0.5 g of PEG2000 in 30 mL of absolute ethanol, dissolve it completely under stirring, and stir at 80° C. for 3 h to obtain a homogeneous solution. 0.125 g of the modified nanoporous silica airgel was vacuumed at 100° C. for 4 hours to completely op...

Embodiment 2

[0031] 3-aminopropyldimethylethoxysilane, 4,4'-biphenyldicarbaldehyde, 0.1molL -1 Nitric acid and anhydrous methanol were mixed at a molar ratio of 1:0.2:30:0.06, stirred at room temperature for 10 minutes to mix evenly, and the above solution was sealed and stored at 80°C for 6 hours to form a gel. Then, the excess ethanol / water mixture was removed from the obtained gel, soaked in an appropriate amount of absolute ethanol, and kept at 20° C. for 10 h to remove residual chemical substances. Repeat this 1 time. Then, the temperature was raised to 120° C. under a program with a heating rate of 2.5° C. / min, and the modified nanoporous silica airgel was obtained after drying at normal pressure for 24 hours.

[0032]Dissolve 0.5 g of stearic acid in 30 mL of absolute ethanol, dissolve it completely under stirring, and stir at 10° C. for 1 h to obtain a uniform solution. 0.125 g of the modified nanoporous silica airgel was vacuumed at 40° C. for 2 hours to completely open the pore...

Embodiment 3

[0034] 3-aminopropyltriethoxysilane, 2 amino-terephthalaldehyde, 0.5molL -1 Formic acid and n-hexane were mixed at a molar ratio of 1:1:15:0.6, stirred at room temperature for 30 minutes to mix evenly, and the above solution was sealed and stored at 20°C for 36 hours to form a gel. Then, the excess ethanol / water mixture was removed from the obtained gel, soaked in an appropriate amount of absolute ethanol, and kept at 70° C. for 24 hours to remove residual chemical substances. Repeat this 4 times. Then, the temperature was raised to 60° C. under a program with a heating rate of 5° C. / min, and the modified nanoporous silica airgel was obtained after drying at normal pressure for 120 hours.

[0035] Dissolve 0.5 g of paraffin in 30 mL of absolute ethanol, dissolve it completely under stirring, and stir at 120° C. for 5 h to obtain a homogeneous solution. Vacuumize 0.125g of modified silica airgel at 200°C for 10h to completely open the pores of the matrix. Then disperse the v...

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Abstract

The invention discloses a preparation method of a modified aerosil-based composite phase-change material. The preparation method includes the steps that a modified aerosil carrier material is prepared first, prepared modified aerosil is placed into a prepared phase-change material solution after being subjected to vacuum drying, a phase-change core material is adsorbed based on the large specific area and the nanopore structure of the modified aerosil carrier material, and after drying, the modified aerosil-based composite phase-change material with a shaping effect is obtained. The preparation method has the advantages that the novel modified aerosil-based composite phase-change material is developed; the prepared modified aerosil-based composite phase-change material can effectively prevent leakage, corrosion and other problems, the loading capacity of the porous phase-change material can be improved, and the service life of the porous phase-change can be prolonged; the method just needs mild reaction conditions and is simple in process, short in period and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of composite phase-change materials, and in particular relates to a preparation method of a modified silica airgel-based composite phase-change material. Background technique [0002] With the increasingly severe energy crisis and environmental pollution, how to improve energy efficiency and protect the environment has become an important topic in recent decades. Phase change heat storage / energy storage technology can store discontinuous and highly random energy in an appropriate medium and release it when needed, so as to realize efficient use of energy and solve the mismatch between energy supply and demand in time and space The problem. Phase change materials (PCMs) are a class of high-tech materials developed in recent years. The endothermic and exothermic effects generated during the phase change process can be used for thermal energy storage and temperature regulation. At present, phase change materials have b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00C09K5/06
CPCY02P20/141
Inventor 高鸿毅冯妍卉周孝飞
Owner 南京逸柔蒂雯新材料科技有限公司
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