CN103194183A - Preparation method of alkanol self-temperature control phase change material - Google Patents
Preparation method of alkanol self-temperature control phase change material Download PDFInfo
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- CN103194183A CN103194183A CN2013101434677A CN201310143467A CN103194183A CN 103194183 A CN103194183 A CN 103194183A CN 2013101434677 A CN2013101434677 A CN 2013101434677A CN 201310143467 A CN201310143467 A CN 201310143467A CN 103194183 A CN103194183 A CN 103194183A
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Abstract
The invention discloses a preparation method of a phase change material. The preparation method is that dodecanol serving as a main phase change agent and paraffin serving as a secondary phase change agent are adopted for preparing a low-temperature phase change material. The low-temperature phase change material has phase change temperature about 22 DEG C, is relatively high in phase change enthalpy value which is about 180J/g, has stable performance, excellent phase change reversibility and little change in size during the phase change, and is safe, nontoxic and non-corrosive.
Description
Technical field
The present invention relates to a kind of preparation method of phase change material, particularly a kind of transformation temperature is the phase change material about 25 ℃.
Background technology
In recent years, phase-changing energy storage material (phase change material, PCM) become the focus of domestic and international energy utilization and the research of Materials science aspect, phase change energy storage technology can solve energy supply and demand unmatched contradiction on time and space, is the effective means that improves energy utilization rate.Phase change material in its thing phase change process, heat (cold) amount that can absorbing environmental, and emit heat (cold) amount to environment when needed, thus reach the purpose of control ambient temperature.Utilizing the latent heat of phase change of phase change material to carry out storage and the application of energy, is to be subjected to the extensively problem of attention in recent years.
As typical case's representative of crystalline hydrate salt, calcium chloride hexahydrate has following characteristics: at 29.9 ℃ solid-liquid phase change takes place, melting heat is 170kJ/kg.Because melting heat is bigger, temperature is moderate, and chemical property is stable, raw material sources extensively and low price, so calcium chloride hexahydrate is put into the market as phase-change heat-storage material, is widely used as heating, refrigeration, air-conditioning.
But, this class inorganic phase-changing material exists two problems usually: the one, and surfusion, be material when condensing to " condensation point " and non-crystallizable, and must begin crystallization to the certain temperature time side below " condensation point ", present terms of settlement is that the adding nucleator is to promote its crystallization.Another problem is to occur being separated, and when namely heating made saline mixture become inorganic salt, some salt had part to be not dissolved in crystal water and is sunken to the bottom, also is not combined with crystal water during cooling, thereby forms layering, and solution is to add thickening material usually.
At present, having developed with calcium chloride hexahydrate is that main heat-storage agent, xanthan gum are thickening material, SrO
2Be the phase change material system of nucleator, its most application all is that the fusing point according to calcium chloride hexahydrate drops into suitable occasion, does not mention the problem that reduces transformation temperature.For the phase change material that is applied in the suit, regulate the body temperature balance of cosmonaut under working aloft, air-tight state in order to reach, its transformation temperature must be lower, belongs to cold-storage body system.Therefore, produce big, with low cost, the nontoxic non-corrosiveness of a kind of latent heat of phase change, stability better and the phase change material of transformation temperature about 22 ℃ has great significance.
Summary of the invention
According to background technology, the object of the present invention is to provide big, with low cost, the nontoxic non-corrosiveness of a kind of latent heat of phase change, stability better and the phase change material of transformation temperature about 25 ℃.
The nontoxic non-corrosiveness of this phase change material, 23～27 ℃ of transformation temperatures, enthalpy of phase change 160～230kJ/kg, good thermal stability; And the preparation method is simple, and raw material is easy to get, and cost is low, can satisfy the requirement that a kind of protective clothing is used the cooling phase-change material.
Technical scheme is as follows:
A kind of preparation method of phase change material is characterized in that C
6~ C
20Alkanol master phase transition agent and contain C
10~ C
50The auxilliary phase transition agent of paraffins mixture is according to the mixed of mol ratio 1:2 ~ 10, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 ℃ from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, cool off at normal temperature, perhaps obtain required goods in the normal temperature cooling, freezing 15 ~ 72h obtains 23～27 ℃ of transformation temperatures, the phase change material of enthalpy of phase change 160～230kJ/kg;
Preferably, C
6~ C
20Alkanol master phase transition agent and contain C
10~ C
50The auxilliary phase transition agent of paraffins mixture is respectively lauryl alcohol and paraffin;
Preferred, the mol ratio of lauryl alcohol and paraffin is 1:4 ~ 7.
Description of drawings
Fig. 1 is example 1,2,3,4 DSC graphic representation;
Fig. 2 is example 5,6,7,8,9,10 DSC graphic representation.
Embodiment
Used raw material among the present invention: lauryl alcohol, analytical pure, Beijing lean chemical preparations company limited; Paraffin, Tianjin good fortune chemical reagent in morning factory.
Weighing paraffin and lauryl alcohol sample are poured in the beaker by a certain percentage, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling.
The transformation temperature of phase change material and enthalpy of phase change adopt differential scanning calorimeter (DSC) to measure.
The invention will be further described below in conjunction with embodiment.
Embodiment 1
In paraffin: lauryl alcohol=1:4 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling.
The phase change material transformation temperature that makes is 24.45 ℃, and enthalpy of phase change is 162.7091 kJ/kg, sees accompanying drawing 1.
Embodiment 2
In paraffin: lauryl alcohol=1:5 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling.
The phase change material transformation temperature that makes is 24.97 ℃, and enthalpy of phase change is 187.5993 kJ/kg, sees accompanying drawing 1.
Embodiment 3
In paraffin: lauryl alcohol=1:6 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling.The phase change material transformation temperature that makes is 26.38 ℃, and enthalpy of phase change is 161.04 kJ/kg, sees accompanying drawing 1.
Embodiment 4
In paraffin: lauryl alcohol=1:7 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling.
The phase change material transformation temperature that makes is 23.8 ℃, and enthalpy of phase change is 161.4374 kJ/kg, sees accompanying drawing 1.
Embodiment 5
In paraffin: lauryl alcohol=1:5 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling, without freezing, directly survey its transformation temperature and enthalpy of phase change.
The phase change material transformation temperature that makes is 23.77 ℃, and enthalpy of phase change is 189.2743 kJ/kg, sees accompanying drawing 2.
Embodiment 6
In paraffin: lauryl alcohol=1:5 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling, freezing 15h surveys its transformation temperature and enthalpy of phase change.
The phase change material transformation temperature that makes is 23.41 ℃, and enthalpy of phase change is 227.122 kJ/kg, sees accompanying drawing 2.
Embodiment 7
In paraffin: lauryl alcohol=1:5 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling, freezing 20h surveys its transformation temperature and enthalpy of phase change.
The phase change material transformation temperature that makes is 23.70 ℃, and enthalpy of phase change is 210.041 kJ/kg, sees accompanying drawing 2.
In paraffin: lauryl alcohol=1:5 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling, freezing 24h surveys its transformation temperature and enthalpy of phase change.
The phase change material transformation temperature that makes is 24.31 ℃, and enthalpy of phase change is 216.36 kJ/kg, sees accompanying drawing 2.
In paraffin: lauryl alcohol=1:5 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling, freezing 50h surveys its transformation temperature and enthalpy of phase change.
The phase change material transformation temperature that makes is 23.29 ℃, and enthalpy of phase change is 201.65 kJ/kg, sees accompanying drawing 2.
In paraffin: lauryl alcohol=1:5 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 degree from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling, freezing 72h surveys its transformation temperature and enthalpy of phase change.
The phase change material transformation temperature that makes is 24.03 ℃, and enthalpy of phase change is 207.87 kJ/kg, sees accompanying drawing 2.
Claims (5)
1. an alkanols self-temperature-adjusting phase change preparation methods is characterized in that: with C
6~ C
20Alkanol master phase transition agent and contain C
10~ C
50The auxilliary phase transition agent of paraffins mixture is according to the mixed of mol ratio 1:2 ~ 10, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 ℃ from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, cool off at normal temperature, perhaps obtain required goods in the normal temperature cooling, freezing 15 ~ 72h obtains 23～27 ℃ of transformation temperatures, the phase change material of enthalpy of phase change 160～230kJ/kg.
2. alkanols self-temperature-adjusting phase change preparation methods according to claim 1 is characterized in that: with C
6~ C
20Alkanol master phase transition agent and contain C
10~ C
50The auxilliary phase transition agent of paraffins mixture is respectively lauryl alcohol and paraffin.
3. alkanols self-temperature-adjusting phase change preparation methods according to claim 2, it is characterized in that: the mol ratio of described lauryl alcohol and paraffin is 1:4 ~ 7.
4. alkanols self-temperature-adjusting phase change preparation methods according to claim 1, it is characterized in that: in paraffin: lauryl alcohol=1:4 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 ℃ from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling, the phase change material transformation temperature that makes is 24.45 ℃, and enthalpy of phase change is 162.7091 kJ/kg.
5. alkanols self-temperature-adjusting phase change preparation methods according to claim 1, it is characterized in that: in paraffin: lauryl alcohol=1:5 ratio weighing sample, pour in the beaker, put into thermostatic bath then, regulate temperature, make thermostatic bath begin to warm to 70 ℃ from room temperature, observe the sample form, when treating that sample becomes the transparence liquid state fully, take out sample, obtain required goods in the normal temperature cooling, freezing 50h, survey its transformation temperature and enthalpy of phase change, the phase change material transformation temperature that makes is 23.29 ℃, and enthalpy of phase change is 201.65 kJ/kg.
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Cited By (8)
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| CN103468222A (en) * | 2013-09-24 | 2013-12-25 | 冶艳 | Preparation method of low-temperature phase-change micro-capsule |
| CN104650816A (en) * | 2015-02-06 | 2015-05-27 | 桂林电子科技大学 | Low-temperature phase-change energy storage microcapsule and preparation method thereof |
| CN104650815A (en) * | 2015-02-06 | 2015-05-27 | 桂林电子科技大学 | Composite figuration phase change cold-storage material and preparation method thereof |
| CN105647481A (en) * | 2016-01-18 | 2016-06-08 | 北京理工大学 | Medium-low temperature phase change cold storage material and preparation method thereof |
| CN105969316A (en) * | 2016-06-03 | 2016-09-28 | 宁海德宝立新材料有限公司 | Phase-change heat-storage composite material for hot compress |
| CN111647389A (en) * | 2020-06-17 | 2020-09-11 | 塔里木大学 | Preparation method and product of phase change coolant |
| CN111795992A (en) * | 2019-04-08 | 2020-10-20 | 江苏和成显示科技有限公司 | Method for determining low-temperature stability of nematic phase of liquid crystal composition |
| CN112368355A (en) * | 2018-06-28 | 2021-02-12 | 株式会社钟化 | Heat storage material composition and use thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468222A (en) * | 2013-09-24 | 2013-12-25 | 冶艳 | Preparation method of low-temperature phase-change micro-capsule |
| CN104650816A (en) * | 2015-02-06 | 2015-05-27 | 桂林电子科技大学 | Low-temperature phase-change energy storage microcapsule and preparation method thereof |
| CN104650815A (en) * | 2015-02-06 | 2015-05-27 | 桂林电子科技大学 | Composite figuration phase change cold-storage material and preparation method thereof |
| CN104650815B (en) * | 2015-02-06 | 2018-01-30 | 桂林电子科技大学 | A kind of composite shape-setting cooling storage material and preparation method thereof |
| CN105647481A (en) * | 2016-01-18 | 2016-06-08 | 北京理工大学 | Medium-low temperature phase change cold storage material and preparation method thereof |
| CN105647481B (en) * | 2016-01-18 | 2019-04-12 | 北京理工大学 | A kind of middle low temperature phase change cold storage material and preparation method thereof |
| CN105969316A (en) * | 2016-06-03 | 2016-09-28 | 宁海德宝立新材料有限公司 | Phase-change heat-storage composite material for hot compress |
| CN112368355A (en) * | 2018-06-28 | 2021-02-12 | 株式会社钟化 | Heat storage material composition and use thereof |
| CN111795992A (en) * | 2019-04-08 | 2020-10-20 | 江苏和成显示科技有限公司 | Method for determining low-temperature stability of nematic phase of liquid crystal composition |
| CN111795992B (en) * | 2019-04-08 | 2023-08-18 | 江苏和成显示科技有限公司 | Method for determining low-temperature stability of nematic phase of liquid crystal composition |
| CN111647389A (en) * | 2020-06-17 | 2020-09-11 | 塔里木大学 | Preparation method and product of phase change coolant |
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