CN114316906B - Novel phase change system of long-chain hydrocarbon and long-chain hydrocarbon-based polymer - Google Patents
Novel phase change system of long-chain hydrocarbon and long-chain hydrocarbon-based polymer Download PDFInfo
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- CN114316906B CN114316906B CN202111478524.8A CN202111478524A CN114316906B CN 114316906 B CN114316906 B CN 114316906B CN 202111478524 A CN202111478524 A CN 202111478524A CN 114316906 B CN114316906 B CN 114316906B
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- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 49
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 49
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 49
- 229920000642 polymer Polymers 0.000 title claims abstract description 19
- 239000012782 phase change material Substances 0.000 claims abstract description 61
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 238000009835 boiling Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 239000011261 inert gas Substances 0.000 claims abstract description 13
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 6
- CBFCDTFDPHXCNY-UHFFFAOYSA-N icosane Chemical compound CCCCCCCCCCCCCCCCCCCC CBFCDTFDPHXCNY-UHFFFAOYSA-N 0.000 claims description 12
- ZYURHZPYMFLWSH-UHFFFAOYSA-N octacosane Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCC ZYURHZPYMFLWSH-UHFFFAOYSA-N 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 claims 1
- 239000012071 phase Substances 0.000 abstract description 49
- 230000000694 effects Effects 0.000 abstract description 5
- 239000007791 liquid phase Substances 0.000 abstract description 2
- -1 aliphatic alcohols Chemical class 0.000 description 9
- 239000004698 Polyethylene Substances 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- YDLYQMBWCWFRAI-UHFFFAOYSA-N hexatriacontane Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC YDLYQMBWCWFRAI-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 2
- 238000012691 depolymerization reaction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012074 organic phase Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a novel phase change system of long-chain hydrocarbon and long-chain hydrocarbon-based polymer. The novel phase change system of the long-chain hydrocarbon and the long-chain hydrocarbon polymer consists of a phase change material and a phase building agent, wherein the phase change material is the long-chain hydrocarbon polymer or the long-chain hydrocarbon, the phase building agent is nitrogen, inert gas or liquid with the boiling point lower than 90 ℃, the volume of the phase change material accounts for 1/50-1/7 of the volume of the phase change system, the original heating rate of the phase change system is more than 10 ℃/min, and the initial pressure in the phase change system is 0.5-4 MPa. The novel phase change system of the long-chain hydrocarbon and long-chain hydrocarbon-based polymer provided by the invention realizes a severe self-exothermic effect based on liquid-liquid phase in a high-pressure atmosphere and a higher temperature interval, and the discovery of the effect has important significance for long-chain molecular phase change research and has potential application value in various fields.
Description
Technical Field
The invention relates to the technical field of phase change materials, in particular to a novel phase change system of long-chain hydrocarbon and long-chain hydrocarbon-based polymer.
Background
Phase change materials are a class of substances that can absorb or release heat to achieve energy storage using changes in their own structure. With the development of industrial civilization, phase change material driven thermal systems have important applications in thermal energy storage and thermal management systems. The organic phase change material has the advantages of good chemical stability, thermal stability, no corrosiveness and the like, and has great application potential in the aspects of building, solar energy, waste heat recycling and the like.
At present, common organic phase change materials comprise polymeric phase change materials and long-chain aliphatic hydrocarbons, higher aliphatic alcohols, higher fatty acids or higher aliphatic esters, and the melting temperatures of the phase change materials are different, so that the use requirements of partial occasions can be met; the application range is also limited in view of its low heat resistance temperature. In addition, studies on phase change materials have focused on the use of absorption or release of phase change latent heat, keeping the temperature of the material itself unchanged; examples of inducing a larger amplitude temperature change of the phase change system by the phase change process of the material itself are less visible. Therefore, the development of a novel phase change system of long-chain hydrocarbon and long-chain hydrocarbon-based polymer which is applicable at higher temperature and has strong heating/cooling effect has important significance.
Disclosure of Invention
The invention solves the problems in the prior art, and aims to provide a novel phase change system of long-chain hydrocarbon and long-chain hydrocarbon-based polymer, which realizes collapse phase change of macromolecular conformation of the long-chain hydrocarbon and long-chain hydrocarbon-based polymer in a limited space by controlling the quantity of phase change materials, the temperature rising rate of the phase change system and setting the temperature and the atmosphere pressure (or the quantity of low-boiling point liquid) of the phase change system, and realizes sudden rise or drop of the temperature of the phase change system under the condition of no external energy input.
In order to achieve the above purpose, the invention adopts the following technical scheme: the novel phase change system of the long-chain hydrocarbon and the long-chain hydrocarbon polymer consists of a phase change material and a phase building agent, wherein the phase change material is the long-chain hydrocarbon polymer or the long-chain hydrocarbon, the phase building agent is nitrogen, inert gas or liquid with the boiling point lower than 90 ℃, the volume of the phase change material accounts for 1/50-1/7 of the volume of the phase change system, the original heating rate of the phase change system is more than 10 ℃/min, and the initial pressure in the phase change system is 0.5-4 MPa. The nitrogen and inert gas in the phase building agent are high-pressure gas, and the purity of the gas is limited so as not to cause oxidation reaction deterioration of the phase change material.
The temperature change rule of the novel phase change system of the long-chain hydrocarbon and long-chain hydrocarbon-based polymer provided by the invention is as follows: (1) With the increase of the upper atmosphere pressure or the increase of the quantity of low boiling point liquid, the phase change material has higher self-heat release heating rate and higher peak temperature after reaching a critical point; (2) In the case of a low boiling point liquid as a phase building agent, the self-exothermic temperature rise rate and peak temperature of the phase change material after reaching the critical point decrease as the boiling point of the low boiling point liquid increases; (3) With the increase of the quantity of the phase change materials, the self-heat release heating rate and the peak temperature of the phase change materials after reaching the critical point show a trend of increasing and then decreasing; (4) As the early temperature rise rate increases, the self-exothermic temperature rise rate and peak temperature of the phase change material after reaching the critical point tend to increase.
Preferably, the long-chain hydrocarbon is a long-chain hydrocarbon with more than 18 carbon atoms. More preferably, the long-chain hydrocarbon is a C18-C36 long-chain hydrocarbon.
Further preferably, the phase change material is one selected from eicosane, octacosane, hexatriacontane, polyethylene, polypropylene and polystyrene.
Preferably, the volume of the phase change material accounts for 1/9 to 1/7 of the volume of the phase change system.
Preferably, the original heating rate of the phase change system is 15-30 ℃/min.
Preferably, the initial pressure of the nitrogen or the inert gas is 1-2 MPa, and the inert gas is argon or helium.
Preferably, the liquid with the boiling point lower than 90 ℃ is liquid hydrocarbon with the boiling point of C6-C10.
Compared with the prior art, the invention has the beneficial effects that:
1. the phase-change system has good thermal stability and can be repeatedly used under the decomposition temperature of long-chain hydrocarbon;
2. according to the invention, the type/chain length of long-chain hydrocarbon in the phase-change system, the upper pressure, the initial temperature or the heating rate and other condition parameters are adjusted according to the actual application requirements, different phase-change critical points, the self-heat release process temperature rise rate and the peak temperature can be obtained, and the use requirements of different occasions are met;
3. the phase building agent of the novel phase change system provided by the invention comprises high-pressure inert gas or low-boiling point liquid, can be selected according to the requirements of specific temperature rise rate and peak temperature, and has strong controllability and high safety;
4. the novel phase change system of the long-chain hydrocarbon and long-chain hydrocarbon-based polymer provided by the invention realizes a severe self-exothermic effect based on liquid-liquid phase in a high-pressure atmosphere and a higher temperature interval, and the discovery of the effect has important significance for long-chain molecular phase change research and has potential application value in various fields.
Drawings
FIG. 1 is a schematic structural diagram of a reaction vessel of a novel phase change system of long-chain hydrocarbon and long-chain hydrocarbon-based polymer according to the present invention;
reference numerals illustrate: 1. a phase change material; 2. phase building agents.
Detailed Description
The following examples are further illustrative of the invention and are not intended to be limiting thereof. The equipment and reagents used in the present invention are conventional commercially available products in the art, unless specifically indicated.
As shown in fig. 1, the phase change material 1 is disposed at the bottom of the phase change system reaction vessel, and the phase building agent 2 is disposed at the top.
The new phase change system consists of phase change material and phase constructing agent, the phase change material is long chain hydrocarbon polymer or long chain hydrocarbon, the phase constructing agent is nitrogen, inert gas or liquid with boiling point lower than 90 deg.c, the volume of the phase change material accounts for 1/50-1/7 of the volume of the phase change system, the original temperature raising rate of the phase change system is greater than 10 deg.c/min, and the initial pressure inside the phase change system is 0.5-4 MPa. The nitrogen and inert gas in the phase building agent are high-pressure gas, and the purity of the gas is limited so as not to cause oxidation reaction deterioration of the phase change material.
The long-chain hydrocarbon is a long-chain hydrocarbon with more than 18 carbon atoms, and in the following embodiments, the phase change material is one selected from eicosane, octacosane, hexatriacontane, polyethylene, polypropylene and polystyrene.
In the following examples, it is preferred that the volume of the phase change material is 1/9 to 1/7 of the volume of the phase change system. The original heating rate of the phase-change system is 15-30 ℃/min.
The initial pressure of nitrogen or inert gas is 1-2 MPa, and the inert gas is argon or helium. The liquid with the boiling point lower than 90 ℃ is liquid hydrocarbon with the boiling point of C6-C10.
Example 1
The container volume of the phase-change system is 100mL, the phase-change material is eicosane, the volume of the phase-change material accounts for 1/8 of the volume of the phase-change system, the phase-building agent is nitrogen, the initial pressure of the nitrogen is 1MPa, the initial temperature rising rate is 15 ℃/min, and the set temperature is 230 ℃. When the temperature of the phase-change system is increased to 230 ℃, external heat supply is stopped, and the phase-change material is heated to the peak temperature of 310 ℃ at a heating rate of about 120 ℃/min because the phase-change material collapses and releases heat.
Comparative example 1
The container volume of the phase-change system is 100mL, the phase-change material is eicosane, the volume of the phase-change material accounts for 1/4 of the volume of the phase-change system, the phase-building agent is nitrogen, the initial pressure of the nitrogen is 1MPa, the initial temperature rising rate is 15 ℃/min, and the set temperature is 230 ℃. When the temperature of the phase-change system is increased to 230 ℃, external heat supply is stopped, and the phase-change material does not generate self-heat.
Comparative example 2
The container volume of the phase-change system is 100mL, the phase-change material is eicosane, the volume of the phase-change material accounts for 1/8 of the volume of the phase-change system, the upper atmosphere pressure is provided by nitrogen, the initial pressure of the nitrogen is 1MPa, the original heating rate is 2 ℃/min, and the set temperature is 230 ℃. When the temperature of the phase-change system is increased to 230 ℃, external heat supply is stopped, and the phase-change material does not generate self-heat.
Comparative example 3
The container volume of the phase-change system is 100mL, the phase-change material is decane, the volume of the phase-change material accounts for 1/8 of the volume of the phase-change system, the upper atmosphere pressure is provided by nitrogen, the initial pressure of the nitrogen is 1MPa, the initial temperature rising rate is 15 ℃/min, and the set temperature is 230 ℃. When the temperature of the phase-change system is increased to 230 ℃, external heat supply is stopped, and the phase-change material does not generate self-heat.
In comparison with comparative examples 1-3, example 1 exhibited a self-exothermic phenomenon, indicating that the phase change material fill rate, the system temperature rise rate, and the phase change material chain length were sufficient conditions to achieve the self-exothermic phenomenon.
Example 2
The volume of the container of the phase-change system is 100mL, the phase-change material is octacosane, the volume of the phase-change material accounts for 1/9 of the volume of the phase-change system, the upper atmosphere pressure is provided by nitrogen, the initial pressure of the nitrogen is 1MPa, the initial temperature rising rate is 15 ℃/min, and the set temperature is 250 ℃. When the temperature of the phase-change system is raised to 250 ℃, external heat supply is stopped, and the phase-change material is raised to the peak temperature of 340 ℃ at a temperature-raising rate of about 150 ℃/min due to heat release of the phase-change material due to collapse phase change occurring in the phase-change material.
Example 3
The volume of the container of the phase-change system is 100mL, the phase-change material is polyethylene, the volume of the phase-change material accounts for 1/7 of the volume of the phase-change system, the upper atmosphere pressure is provided by nitrogen, the initial pressure of the nitrogen is 1MPa, the initial temperature rising rate is 15 ℃/min, and the set temperature is 340 ℃. When the phase-change system is heated to 340 ℃, external heat supply is stopped, the phase-change material is heated to the peak temperature of 410 ℃ at a heating rate of about 110 ℃/min due to heat release of collapse phase change occurring in the phase-change material, but the self-heat release phenomenon of the same degree does not exist in the second heating process due to depolymerization reaction of polyethylene at the temperature.
Example 4
The volume of the container of the phase-change system is 100mL, the phase-change material is polyethylene, the volume of the phase-change material accounts for 1/7 of the volume of the phase-change system, the upper atmosphere pressure is provided by nitrogen, the initial pressure of the nitrogen is 2MPa, the initial temperature rising rate is 30 ℃/min, and the set temperature is 340 ℃. When the phase-change system is heated to 340 ℃, external heat supply is stopped, the phase-change material is heated to 430 ℃ at a peak temperature at a heating rate of about 110 ℃/min due to heat release of the collapse phase-change generated in the phase-change material, but the self-heat release phenomenon of the same degree does not exist in the second heating process due to depolymerization reaction of the polyethylene at the temperature.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (4)
1. The novel phase change system is characterized by comprising a phase change material and a phase building agent, wherein the phase change material is one of eicosane, octacosane and tricetyl alkane, the phase building agent is nitrogen, inert gas or liquid with a boiling point lower than 90 ℃, the volume of the phase change material accounts for 1/50-1/7 of the volume of the phase change system, the original heating rate of the phase change system is more than 10 ℃/min, and the initial pressure in the phase change system is 0.5-4 MPa; the volume of the phase change material accounts for 1/9-1/7 of the volume of the phase change system.
2. The phase change system of long chain hydrocarbon and long chain hydrocarbon based polymer according to claim 1, wherein the initial pressure of the nitrogen or inert gas is 1-2 MPa, and the inert gas is argon or helium.
3. The novel phase change system of long chain hydrocarbon and long chain hydrocarbon based polymer according to claim 1, wherein the original temperature rising rate of the phase change system is 15-30 ℃/min.
4. The phase change system of long chain hydrocarbon and long chain hydrocarbon based polymer according to claim 1, wherein the liquid with boiling point lower than 90 ℃ is a liquid hydrocarbon of C6-C10.
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| CN114316906B true CN114316906B (en) | 2023-11-14 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007291359A (en) * | 2006-03-29 | 2007-11-08 | Kawamura Inst Of Chem Res | Hollow polymer particle, colored hollow polymer particle and method for producing the same |
| CN113429994A (en) * | 2021-06-15 | 2021-09-24 | 佛山市科恒博环保技术有限公司 | Self-heat-release phase-change thermal cracking process for polyolefin waste plastics |
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- 2021-12-06 CN CN202111478524.8A patent/CN114316906B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007291359A (en) * | 2006-03-29 | 2007-11-08 | Kawamura Inst Of Chem Res | Hollow polymer particle, colored hollow polymer particle and method for producing the same |
| CN113429994A (en) * | 2021-06-15 | 2021-09-24 | 佛山市科恒博环保技术有限公司 | Self-heat-release phase-change thermal cracking process for polyolefin waste plastics |
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