CN108822803A - A kind of 33-35 DEG C of Organic-inorganic composite shaping phase-change material and preparation method - Google Patents
A kind of 33-35 DEG C of Organic-inorganic composite shaping phase-change material and preparation method Download PDFInfo
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Abstract
The present invention provides a kind of 33-35 DEG C of Organic-inorganic composite shaping phase-change material and preparation method, belongs to energy storage and field of energy-saving technology.The present invention utilizes lauric acid, palmitinic acid, Na2HPO4·12H2O is that prepare fusing point be 28-34 DEG C to raw material, the phase-change material that latent heat of phase change is 150-160J/g is main energy storage material, using expanded graphite as skeleton encapsulating material, preparing fusing point is 33-35 DEG C, and latent heat of phase change is 140-150J/g Organic-inorganic composite shaping phase-change material.The mass percentage of composition is the lauric acid of 35-45%, the palmitinic acid of 15-25%, the Na of 20-30%2HPO4·12H2The activated alumina of O, 1-2%, the sodium carboxymethylcellulose of 1-3%, the expanded graphite of 8-10%.The phase-change material has good cyclical stability.It is applied to building and heating and is combined with peak-trough electricity and wind energy, solar energy etc., energy supply and demand can be solved and distribute uneven contradiction on space-time, there is good application prospect.
Description
Technical field
The present invention relates to energy storage and field of energy-saving technology, particularly relate to a kind of 33-35 DEG C of Organic-inorganic composite setting phase
Become material and preparation method.
Background technique
Building energy consumption and industrial consumption energy, traffic consume energy and claim China three big " big power consumer ".For 2015, the whole nation is built
Building total energy consumption is 8.57 hundred million tons of standard coals, accounts for the 19.93% of national total energy consumption.In building energy consumption, refrigeration
It is most with heating energy consumption accounting, account for about the 50%~70% of building total energy consumption.
Traditional consumption-reducing method is that consumption of the insulating to reduce cooling in summer amount and heat supply in winter amount is laid with outside wall
It dissipates.In recent years, exploitation has the New Building Materials of temperature control ability, it has also become the research hotspot of building energy saving field.By phase transformation
Energy storage material (PCMs) is added in construction material, and phase-changing energy-storing building materials are made, adjust room temperature with its hidden heat energy storage,
It can further improve the degree of power conservation of constructing operation.This shows three aspects：(1) storage heat release, balance electricity are carried out using peak-trough electricity
Net peak-trough electricity difference enhances grid stability, improves rational energy utilization rate；(2) it is combined with wind energy and solar power generation,
Electricity is stored in the form of thermal energy in power generation peak period, abandonment is reduced and abandons optical phenomenon, reduce heating energy consumption；(3) effectively resistance
Only room temperature fluctuates widely, and improves comfortable for living.
Sari et al. (Solar Energy Mater Solar Cells, 2009,93：571-576) be prepared for palmitinic acid/
Expanded graphite is formed PCMs for latent heat storage application.By Vacuum infusion techniques, palmitinic acid is adsorbed in the hole of expanded graphite
In gap.The phase transition temperature and latent heat of phase change for measuring the material are respectively 60.8 DEG C and 148.36J/g.Melt/coagulate through 3000 times
Gu thermal cycling test shows that the physicochemical properties variation of composite material is less.Li Yuntao et al. (material Leader B：A piece is studied,
2017,31 (2)：91-99) the capric acid (CA-LA-SA/EG composite shape-setting PCMs) prepared, phase transition temperature are 38.6 DEG C, phase transformation
Latent heat is 123J/g, and thermal coefficient is 3.57W/ (mK), and PCMs is uniformly dispersed, and grain diameter is smaller, with excellent hot
Energy and stability.Guo Jing et al. (composite material journal, 2016,33 (11)：2674-2681) select LA-PA preparation binary low total
Molten fatty acid is as energy storage material, the biology base SiO extracted with discarded straw and rice-straw ash2(b-SiO2) powder is as skeleton material
Material is prepared for LA-PA/b-SiO using melting method of impregnation2Be formed PCMs.LA-PA is bound b-SiO2In porous network.With b-
SiO2The increase of content, LA-PA/b-SiO2The crystallinity of compound PCMs reduces.LA-PA/b-SiO2Compound PCMs has good
Phase transition property and thermal stability, latent heat of phase change is between 67.3~146.0J/g.At this stage mostly using only organic phase change material
As main energy storage material, high expensive, and there are certain degree of supercoolings, influence storage exothermal efficiency.In organic phase change material, add
Entering part inorganic phase-changing material can be effectively reduced cost, and further decrease degree of supercooling.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of Organic-inorganic composite shaping phase-change material and preparation method,
Fusing point is prepared at 33-35 DEG C, Organic-inorganic composite shaping phase-change material of the latent heat of phase change in 140-150J/g.
The present invention prepares a kind of phase-changing energy storage material that can be applied to architectural exterior-protecting construction.Organic PCMs and inorganic PCMs by
In material nature difference, mutual compatibility is poor, it is difficult to form the compound PCMs of stable homogeneous.Therefore by addition nucleating agent, reduce
The degree of supercooling of inorganic hydrous salt phase transition material enables organic PCMs and inorganic PCMs to reach crystalline state simultaneously.Pass through addition
The mixture state that thickener can make phase-change material keep stable homogeneous sticky in liquid under the action of magnetic agitation, prevents phase
Segregation phenomenon.It can make LA-PA and Na by ultrasonic oscillation effect2HPO4·12H2O mixing is more uniform, and it is small to form crystal grain
Crystal structure, further decrease supercooling degree.Using expanded graphite by LA-PA-Na2HPO4·12H2O is packaged, can be effective
The leakage in phase transition process is reduced, while improving the thermal conductivity of phase-change material.
The lauric acid (LA) that the mass percentage of composite shape-setting phase-change material composition is 35-45%, the palm fibre of 15-25%
Palmitic acid acid (PA), the Na of 20-30%2HPO4·12H2The activated alumina of O, 1-2%, the sodium carboxymethylcellulose (CMC) of 1-3%,
The expanded graphite of 8-10%.
The preparation method of 33-35 DEG C of the Organic-inorganic composite shaping phase-change material, including steps are as follows：
(1) taking mass percentage is the lauric acid of 35-45%, and the palmitinic acid of 15-25% is heated to melting completely, magnetic
Power stirs 2min, the low mixture of preparation LA-PA；
(2) taking mass percentage is the Na of 20-30%2HPO4·12H2The activated alumina of O, 1-2%, have been heated to
It is complete to melt, it stirs evenly, is recrystallized under room temperature, prepare modified Na2HPO4·12H2O；
(3) two kinds of materials made from taking in step (1) and step (2) and mass percentage are 1-3% carboxymethyl cellulose
Plain sodium is added in magnetic stirring apparatus simultaneously, is kept for 50 DEG C, prepares uniformly mixed composite phase-change material after magnetic agitation 5min,
The composite phase-change material being prepared is put into ultrasonic vibration 2min in 50 DEG C of ultrasound bath pot, becomes uniform viscous fluid
Body to get arrive LA-PA-Na2HPO4·12H2O composite phase-change material, fusing point are 28-34 DEG C, latent heat of phase change 150-160J/
g；
(4) expanded graphite that mass percentage is 8-10% is added into composite phase-change material obtained in step (3),
Kept for 50 DEG C, LA-PA-Na is prepared in vacuum suction 2h2HPO4·12H2O/EG composite shape-setting phase-change material, fusing point are
33-35 DEG C, latent heat of phase change 140-150J/g.
Above-mentioned technical proposal of the invention has the beneficial effect that：
The present invention is prepared for fusing point at 33-35 DEG C, Organic-inorganic composite phase-change material of the latent heat of phase change in 150-160J/g
As main heat accumulating, it is packaged using the micro-pore of expanded graphite, solves the leakage problems of phase-change material.Through
Phase transition temperature latent heat of phase change still keeps stable after 1000 circulations, has good cyclical stability.The present invention is by LA-PA-
Na2HPO4·12H2It is 2.53g/cm that O/EG, which prepares bulk density,3.It is 17 DEG C in environment temperature and has carried out thermal conductivity test,
Test result is 1.2-1.3W/mK.With LA-PA-Na2HPO4·12H2The thermal conductivity 0.22W/mK of O is compared, and is about promoted to
Originally 6 times, greatly improve suction exothermal efficiency.
Detailed description of the invention
Fig. 1 is in the embodiment of the present invention with the transformation curve of differential scanning calorimeter (DSC) measurement；
Fig. 2 is phase transition temperature and latent heat of phase change variation diagram during recycling in the embodiment of the present invention 1000 times.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
The present invention provides a kind of 33-35 DEG C of Organic-inorganic composite shaping phase-change material and preparation method.
The lauric acid that the mass percentage of composite shape-setting phase-change material composition is 35-45%, the palm of 15-25%
Acid, the Na of 20-30%2HPO4·12H2The activated alumina of O, 1-2%, the sodium carboxymethylcellulose of 1-3%, 8-10%'s is swollen
Swollen graphite.
The preparation method of the material is：
(1) taking mass percentage is the lauric acid of 35-45%, and the palmitinic acid of 15-25% is heated to melting completely, magnetic
Power stirs 2min, the low mixture of preparation LA-PA；
(2) taking mass percentage is the Na of 20-30%2HPO4·12H2The activated alumina of O, 1-2%, have been heated to
It is complete to melt, it stirs evenly, is recrystallized under room temperature, prepare modified Na2HPO4·12H2O；
(3) two kinds of materials made from taking in step (1) and step (2) and mass percentage are 1-3% carboxymethyl cellulose
Plain sodium is added in magnetic stirring apparatus simultaneously, is kept for 50 DEG C, prepares uniformly mixed composite phase-change material after magnetic agitation 5min,
The composite phase-change material being prepared is put into ultrasonic vibration 2min in 50 DEG C of ultrasound bath pot, becomes uniform viscous fluid
Body to get arrive LA-PA-Na2HPO4·12H2O composite phase-change material, fusing point are 28-34 DEG C, latent heat of phase change 150-160J/
g；
(4) expanded graphite that mass percentage is 8-10% is added into composite phase-change material obtained in step (3),
Kept for 50 DEG C, LA-PA-Na is prepared in vacuum suction 2h2HPO4·12H2O/EG composite shape-setting phase-change material, fusing point are
33-35 DEG C, latent heat of phase change 140-150J/g.
Embodiment
Take quality for the lauric acid of 4.22g, the palmitinic acid of 1.81g, heating and melting utilizes magnetic agitation, stirs 2min system
The standby low mixture of LA-PA, taking quality is the Na of 2.58g2HPO4·12H2The activated alumina of O and 0.14g is uniformly mixed,
It is heated to melting completely, stir evenly, recrystallized under room temperature, prepare modified Na2HPO4·12H2O.It and with quality is 0.25g
CMC is slowly added in magnetic stirring apparatus simultaneously, is kept for 50 DEG C, is prepared uniformly mixed composite phase-change material after magnetic agitation 5min
The composite phase-change material being prepared, is put into ultrasonic vibration 2min in 50 DEG C of ultrasound bath pot by material, becomes uniformly sticky
Liquid to get arrive LA-PA-Na2HPO4·12H2O composite phase-change material.1g expanded graphite is added, is kept for 50 DEG C, vacuum suction
2h prepares LA-PA-Na2HPO4·12H2O/EG composite setting phase-change material.Material is tested using DSC, result table
Bright, the phase-change material fusing point is at 33-35 DEG C, and latent heat of phase change is in 142.8J/g.Using Hot Disk heat conduction coefficient tester to it
Thermal conductivity is tested, test result 1.36W/mK.With LA-PA-Na2HPO4·12H2The thermal conductivity 0.22W/mK of O
It compares, is about promoted to original 6.18 times, greatly improves suction exothermal efficiency.As shown in Figure 1, differential scanning calorimeter (DSC)
Ordinate is heat flow value herein in the transformation curve of measurement, and upward phase transformation peak area is the heat discharged when solidification, to
Under phase transformation peak area be the heat that absorbs when melting.It melts and the starting point of solidification is fusion temperature or setting temperature.It utilizes
Accelerate thermocycling experiment, as shown in Fig. 2, circulation 1000 times the result shows that, phase transition temperature and latent heat of phase change be not in cyclic process
There is larger fluctuation, the phase-change material is with good stability.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of 33-35 DEG C of Organic-inorganic composite shaping phase-change material, it is characterised in that：The mass percentage of composition is
The lauric acid of 35-45%, the palmitinic acid of 15-25%, the Na of 20-30%2HPO4·12H2The activated alumina of O, 1-2%, 1-
3% sodium carboxymethylcellulose, the expanded graphite of 8-10%.
2. the preparation method of 33-35 DEG C according to claim 1 of Organic-inorganic composite shaping phase-change material, feature
It is：Including steps are as follows：
(1) taking mass percentage is the lauric acid of 35-45%, and the palmitinic acid of 15-25% is heated to melting completely, and magnetic force stirs
Mix 2min, the low mixture of preparation LA-PA；
(2) taking mass percentage is the Na of 20-30%2HPO4·12H2The activated alumina of O, 1-2% are heated to melting completely
Change, stir evenly, recrystallized under room temperature, prepares modified Na2HPO4·12H2O；
(3) two kinds of materials made from taking in step (1) and step (2) and mass percentage are 1-3% sodium carboxymethylcellulose
It is added in magnetic stirring apparatus simultaneously, is kept for 50 DEG C, prepare uniformly mixed composite phase-change material after magnetic agitation 5min, will make
Standby obtained composite phase-change material is put into ultrasonic vibration 2min in 50 DEG C of ultrasound bath pot, becomes uniform thick liquid, i.e.,
Obtain LA-PA-Na2HPO4·12H2O composite phase-change material；
(4) expanded graphite that mass percentage is 8-10% is added into composite phase-change material obtained in step (3), keeps
50 DEG C, LA-PA-Na is prepared in vacuum suction 2h2HPO4·12H2O/EG composite shape-setting phase-change material.
3. the preparation method of 33-35 DEG C according to claim 2 of Organic-inorganic composite shaping phase-change material, feature
It is：LA-PA-Na obtained in the step (3)2HPO4·12H2O composite phase-change material fusing point is 28-34 DEG C, latent heat of phase change
For 150-160J/g.
4. the preparation method of 33-35 DEG C according to claim 2 of Organic-inorganic composite shaping phase-change material, feature
It is：LA-PA-Na obtained in the step (4)2HPO4·12H2O/EG composite shape-setting phase-change material fusing point is 33-35 DEG C,
Latent heat of phase change is 140-150J/g.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110819310A (en) * | 2019-11-13 | 2020-02-21 | 江西理工大学 | Composite phase change material and preparation method and application thereof |
| CN111793474A (en) * | 2020-07-24 | 2020-10-20 | 中国科学院上海应用物理研究所 | Assembling method of expanded graphite enhanced heat conduction ceramic matrix-shaped high-temperature phase change heat storage element and heat storage element formed by same |
| WO2021174040A1 (en) * | 2020-02-28 | 2021-09-02 | Phase Change Energy Solutions, Inc. | Compositions containing phase change materials and systems including the same |
| CN113881403A (en) * | 2021-09-13 | 2022-01-04 | 华南理工大学 | Composite phase change material and preparation method and application thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110819310A (en) * | 2019-11-13 | 2020-02-21 | 江西理工大学 | Composite phase change material and preparation method and application thereof |
| WO2021174040A1 (en) * | 2020-02-28 | 2021-09-02 | Phase Change Energy Solutions, Inc. | Compositions containing phase change materials and systems including the same |
| CN111793474A (en) * | 2020-07-24 | 2020-10-20 | 中国科学院上海应用物理研究所 | Assembling method of expanded graphite enhanced heat conduction ceramic matrix-shaped high-temperature phase change heat storage element and heat storage element formed by same |
| CN113881403A (en) * | 2021-09-13 | 2022-01-04 | 华南理工大学 | Composite phase change material and preparation method and application thereof |
| CN113881403B (en) * | 2021-09-13 | 2023-01-06 | 华南理工大学 | Composite phase change material and preparation method and application thereof |
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Application publication date: 20181116 |