Nano TiO2-containing cellulose-based low-temperature phase change energy storage microcapsule and preparation method thereof

A cellulose-based, low-temperature phase change technology, applied in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of high rigidity, easily broken core material, and poor mechanical properties of thermosetting resins, and achieve excellent performance. , The effect of good film formation and good toughness

Active Publication Date: 2016-07-13
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of obtaining the capsule wall through direct polymerization of monomers is complicated. On the one hand, it is difficult to form a dense organic polymer film on the surface of the core material, and it is difficult to prevent the leakage of the core material; Brittle, poor mechanical properties, easy to break and make the core material easy to leak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add the compound emulsifier formed by mixing 3g of Span80 and 2g of Tween80 into a solution consisting of 2.5g of ethylene glycol and 25mL of distilled water, heat and stir in a 40°C water bath to form a uniform solution 1; raise the temperature to 50°C, and adjust the stirring speed to 2000r / min, add 5mL of n-dodecane dropwise into solution 1 at a rate of 2mL / min, and continue stirring for 15min after complete addition to form a stable O / W emulsion 2; dissolve 2g of carboxymethyl cellulose in 100mL Form solution 3 in distilled water; add emulsion 2, 6g of tetrabutyl titanate and 25mg of γ-aminopropylethoxysilane into solution 3, place it in a water bath at 80°C for 3 hours, and then age at room temperature for 6 hours , placed in a vacuum freeze dryer at 10Pa and -10°C for 30 hours, thawed, filtered, and dried in turn to obtain nano-TiO 2 Cellulose-based low-temperature phase-change energy storage microcapsules. The average particle diameter of the microcapsule is 8 μ...

Embodiment 2

[0036]Add the compound emulsifier formed by mixing 1.5g Span80 and 0.5g Tween80 into a solution consisting of 1.5g ethylene glycol and 15mL distilled water, heat and stir in a water bath at 40°C to form a uniform solution 1; Adjust to 4000r / min, add 4mL n-dodecane and 1mL n-tetradecane dropwise into solution 1 at a rate of 2mL / min, and continue stirring for 15min after complete addition to form a stable O / W emulsion 2; Carboxymethyl cellulose was dissolved in 100 mL of distilled water to form solution three; emulsion two, 10 g of tetrabutyl titanate and 50 mg of N-(β-aminoethyl)-γ-aminopropyldimethoxysilane were added to solution three , placed in a water bath at 80°C for heating for 3 hours, then aged at room temperature for 6 hours, placed in a vacuum freeze dryer at 10 Pa and -10°C for 24 hours, thawed, filtered, and dried in sequence to obtain nano-TiO 2 Cellulose-based low-temperature phase-change energy storage microcapsules. The average particle diameter of the microca...

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Abstract

The invention discloses a nano TiO2-containing cellulose-based low-temperature phase change energy storage microcapsule and a preparation method thereof; the low-temperature phase change energy storage microcapsule comprises a capsule core and a capsule wall, wherein the capsule core is a core-shell structure composite phase change material formed by wrapping the surface of paraffin with ethylene glycol, and the capsule wall is formed by a carboxymethyl cellulose membrane doped with nano TiO2 particles; the preparation method comprises the steps of firstly, preparing a composite phase change material by using an aqueous phase ethylene glycol solution and oil phase liquid paraffin through a micro-emulsion method; then, preparing the capsule wall by using a carboxymethyl cellulose water solution containing tetrabutyl titanate and a silane coupling agent through a sol-gel reaction to obtain the microcapsule; the microcapsule has average particle size of 3-10 microns, phase-transition temperature of minus 12 to 5 DEG C and an enthalpy value of 170-200J/g; furthermore, the microcapsule also has good heat-conducting property; the microcapsule is simple in preparation technology and easy in large-scale production, and products of the preparation method do not contain inorganic salt and an organic solvent which can easily corrode a container, so that the preparation method is green and environment-friendly.

Description

technical field [0001] The invention relates to a nano-TiO-containing 2 The invention discloses a cellulose-based low-temperature phase change energy storage microcapsule and a preparation method thereof; it belongs to the technical field of phase change energy storage materials. Background technique [0002] Phase-change air-conditioning cold storage technology is to use phase-change energy storage materials to absorb or release a large amount of heat during the phase change process, so as to store cold energy during low power consumption and use it when power consumption peaks, solving the problem of energy supply and demand in time. And the contradiction of unbalanced spatial distribution, improve energy utilization rate, and achieve the purpose of "shaving peaks and filling valleys" of the power grid. Phase-change air-conditioning cold storage technology, as a successful peak-shaving means of power load, has been valued by countries all over the world, and has become a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/06
CPCB01J13/06C09K5/063
Inventor 罗武生喻胜飞廖曙光
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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