CN107760276A - A kind of preparation method of encapsulation phase-change thermal storage cellular board for green house of vegetables - Google Patents
A kind of preparation method of encapsulation phase-change thermal storage cellular board for green house of vegetables Download PDFInfo
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- CN107760276A CN107760276A CN201711148543.8A CN201711148543A CN107760276A CN 107760276 A CN107760276 A CN 107760276A CN 201711148543 A CN201711148543 A CN 201711148543A CN 107760276 A CN107760276 A CN 107760276A
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Abstract
The invention discloses a kind of preparation method of the composite phase-change heat-storage cellular board for green house of vegetables, the phase-change thermal storage cellular board is incorporated into common Wood honeycomb board after packaging phase change material is crushed using ternary aliphatic acid eutectic/lignin modification expanded vermiculite composite phase-change heat-storage material as phase change cells and prepares heat accumulation composite honeycomb board.It is organically-modified to expanded vermiculite progress using lignin, and carbonization treatment is carried out to it, nano-carbon layer expanded vermiculite is formed, heat conductivility greatly improves, and being packaged processing using ternary aliphatic acid eutectic afterwards prepares encapsulation phase-change heat-storage material.Ternary aliphatic acid eutectic has the stability of single fat acid, and overcomes the defects of single organic phase change material thermal conductivity is low, latent heat of phase change is low, phase transition temperature is not suitable for, easy seepage.Encapsulation phase-change thermal storage cellular board prepared by the method, the seepage, the utilization rate that solve current phase-changing energy storage material generally existing are low, thermal conductivity is low and key issues of poor durability.
Description
Technical field
The present invention relates to a kind of preparation method of phase-change thermal storage composite plate, specifically a kind of use equipped with phase-change heat-storage material
In the preparation method of the composite honeycomb board of green house of vegetables.
Technical background
With expanding economy, the environmental problem getting worse caused by energy shortage and fossil energy.Optimize the energy
The research of structure, energy-saving and emission-reduction and clean energy technology exploitation etc. is also valued by the people all the more.Wherein, solar energy is made
There is huge application prospect for a kind of cleaning, cheap, never exhaustion regenerative resource.Warmhouse booth is to utilize solar energy
To provide the temperature conditionss needed for plant growth.However, winter low temperature and day and night temperature limit greatly the growth of vegetables, make vegetable
Dish yield declines to a great extent.How the key problem that the higher soil moisture is warmhouse booth plantation is obtained in colder season.Too
It is positive can heat reservoir cost it is high, the intermittence supplied in the time and space the problems such as, limit its in green house of vegetables should
With.Heat-storage technology can be used for the contradiction for solving heat energy Supply and Demand mismatch, be to improve efficiency of energy utilization and environmental protection
Important technology.Phase-change material occupies critical role as a kind of effective latent heat heat accumulating in latent heat storage system.Phase transformation
Thermo store honeycomb plate is combined by aluminium honeycomb core, medium density fibre board (MDF) or the plates of solid wood of filling phase-change heat accumulation unit, is had
Phase transformation heat utilization efficiency is high, thermal conductivity is high, effectively encapsulation, light, intensity is high, processing flexibly, install convenient the features such as.By having
The expanded vermiculite heat conductivility of machine and carbonizing and modifying greatly improves, and largely meets the demand for storing heat.Polynary fat
Fat acid eutectic overcomes single fat acid the shortcomings that being used as phase-change heat-storage material, at the same it is cheap be readily available, at present
The structure type research of polyhydric aliphatic acid eutectic thermo store honeycomb plate is less.
The content of the invention
It is an object of the invention to provide a kind of preparation method of the encapsulation phase-change thermal storage cellular board for green house of vegetables, this is multiple
It is high to close the phase-change thermal storage cellular board storing discharging thermal efficiency, heat endurance is good, and physical and mechanical property meets honeycomb composite plate professional standard.
The purpose of the present invention is achieved through the following technical solutions：A kind of encapsulation phase-change thermal storage for green house of vegetables
The preparation of cellular board, it is comprised the following steps that：The phase-change thermal storage composite honeycomb board by phase-change heat-storage material, aluminum cellular board,
3mm thickness medium density fibre board (MDF) or plates of solid wood composition.Composite phase-change material is filled in aluminum cellular board, and every piece of 300mm ×
The optimum filling amount of composite is 77g in 300mm phase-change thermal storage cellular board.It is thick with 3mm using epoxy resin as binding agent
Medium density fibre board (MDF) or plates of solid wood are dash board, and 30min is cold-pressed under 20 DEG C, 4MPa and prepares phase-change thermal storage cellular board.
Wherein, the phase-change heat-storage material is combined by ternary aliphatic acid eutectic and lignin modification expanded vermiculite,
Mass ratio shared by ternary aliphatic acid eutectic is 50%~60%, and optimum quality ratio is 58%.Machinery stirs after the two is mixed
Mix 20min, it is to be mixed uniformly after put it into -0.1MPa, handle 30min in 50 DEG C of vacuum drying chamber.Normal pressure adsorbs 3h,
After absorption terminates, encapsulating material is placed on filter paper, is put into progress seepage experiment in 80 DEG C of air dry ovens, and pass through seepage
Experiment determines maximal absorptive capacity.Room temperature is cooled to, that is, ternary aliphatic acid eutectic/lignin modification expanded vermiculite is made and answers
Close phase-change heat-storage material.
Wherein, used ternary aliphatic acid eutectic be by palmitic acid, capric acid, stearic acid under the conditions of 70 DEG C it is ultrasonic
Handle obtained by 12min distributed renderings.Palmitic acid-capric acid binary of fatty acids eutectic, capric acid mass fraction are wherein prepared first
80~90%, minimum binary eutectic is obtained during mass fraction 84%, minimum 26.73 DEG C of eutectic temperature, then adds stearic acid
Palmitic acid-capric acid-stearic acid ternary aliphatic acid eutectic is prepared, stearic acid mass fraction is no more than 10%, mass fraction 6%
When obtain minimum ternary eutectic thing, minimum 25.57 DEG C of eutectic temperature.
Wherein, used lignin modification expanded vermiculite is at 70 DEG C by expanded vermiculite using lignin quaternary solution
Water bath with thermostatic control in 5h stirred with 300r/min rotating speed, filter separation and be made；The lignin modification being prepared is expanded into leech
Stone is dried, and is put into Muffle furnace is carbonized afterwards, and temperature sets 600 DEG C in an inert atmosphere, processing time 3h, obtains
To nano-carbon layer expanded vermiculite.
Wherein, composite effectively shortens ternary aliphatic acid eutectic heat accumulation and Exotherm Time.Solves ternary fat
The problem of fat acid eutectic capacity of heat transmission difference, substantially increase the storing discharging thermal efficiency.In addition the addition of expanded vermiculite improves
The problem of ternary aliphatic acid eutectic heat release is uneven.
Wherein, the composite in phase-change thermal storage cellular board absorbs amount of heat when having solar irradiation daytime and stored,
Heat release when not having sunshine at night, heat is discharged, so as to ensure the constant of temperature in warmhouse booth.
Phase-change thermal storage composite honeycomb board is the storage and release that heat is carried out using the latent heat of phase change of phase-change material, and existing
Technology is compared, and the present invention has advantages below：
(1) present invention is modified phase-change heat-storage material using biological material lignin, is controlled by ion exchange principle
Load the content of lignin.The preferable Heat Conduction Material such as carbon black, Ran Houzai are adsorbed in research before by way of absorption mostly
Phase-change heat-storage material is encapsulated, but the carbon-coating content of absorption, position there may be the phenomenon of inequality, reduce to a certain extent
The encapsulation content of heat accumulating.The present invention utilizes the carbonization principle of lignin, can manual control expanded vermiculite interlayer in-situ preparation
The thickness of carbon-coating, obtain the heat conductivility for improving encapsulating material and the optimization matching of maximum encapsulation amount.
(2) leakage problems of phase-change material are efficiently solved.There is phase transformation seepage in aliphatic acid and thermal conductivity factor is low (stearic
Sour thermal conductivity factor 0.172W/mK) the shortcomings that, constrain its application.To solve the leakage problems of phase-change material, different envelopes
Package material is used, for example, microencapsulation, electrostatic spinning, sizing it is compound.The present invention is carried out using expanded vermiculite to aliphatic acid
Encapsulation process, seepage will not occur, and enhance thermal conductivity factor and store hot property.
(3) durability of phase-change heat-storage material and applicability are higher.Phase-change heat-storage material is packaged in cellular board by the present invention
In, encapsulation process is convenient, and technological process is simple, and cost is relatively low, and avoids the influence of encapsulating material aging, durable in use, fits
It is strong with property.
Embodiment
Embodiment 1
The ternary aliphatic acid eutectic of 53% mass ratio is mixed with lignin modification expanded vermiculite, mixture is carried out
Mechanical agitation 20min, it is to be mixed uniformly after put it into -0.1MPa, handled 30 minutes in 50 DEG C of vacuum drying chamber.Normal pressure
Absorption 3 hours.After absorption terminates, encapsulating material is placed on filter paper, is put into progress seepage experiment in 80 DEG C of air dry ovens,
And tested by seepage and determine maximal absorptive capacity.Room temperature is cooled to, that is, ternary aliphatic acid eutectic/lignin modification is made
Expanded vermiculite composite phase-change heat-storage material.Seepage does not occur, there is good packaging effect.The composite of preparation melt and
It is respectively 26.01 DEG C and 27.23 DEG C to solidify phase transition temperature；Melt and solidification latent heat of phase change is respectively 139.8J/g and 138.9/
g.Surveyed in sheet surface layer and uniformly smear epoxy resin, aluminum honeycombed sheet core is laid on glue-line.Composite phase-change material is uniform
Mat formation in honeycomb core (77g/300mm × 300mm), and upper table laminate is covered after clearing up surface.Obtain prefabricated slab.Using
Intelligent control experiment press is cold-pressed, and temperature of colding pressing is at 20 DEG C or so, cold pressing pressure 4MPa.The phase-change accumulation energy honeybee of preparation
Nest plate Exotherm Time extends 80%.
Embodiment 2
The ternary aliphatic acid eutectic of 58% mass ratio is mixed with lignin modification expanded vermiculite, mixture is carried out
Mechanical agitation 20min, it is to be mixed uniformly after put it into -0.1MPa, handled 30 minutes in 50 DEG C of vacuum drying chamber.Normal pressure
Absorption 3 hours.After absorption terminates, encapsulating material is placed on filter paper, is put into progress seepage experiment in 80 DEG C of air dry ovens,
And tested by seepage and determine maximal absorptive capacity.Room temperature is cooled to, that is, ternary aliphatic acid eutectic/lignin modification is made
Expanded vermiculite composite phase-change heat-storage material.Seepage does not occur, there is good packaging effect.The composite of preparation melt and
It is respectively 26.63 DEG C and 27.97 DEG C to solidify phase transition temperature；Melt and solidification latent heat of phase change is respectively 142.6J/g and 140.9/
g.Surveyed in sheet surface layer and uniformly smear epoxy resin, aluminum honeycombed sheet core is laid on glue-line.Composite phase-change material is uniform
Mat formation in honeycomb core (77g/300mm × 300mm), and upper table laminate is covered after clearing up surface.Obtain prefabricated slab.Using
Intelligent control experiment press is cold-pressed, and temperature of colding pressing is at 20 DEG C or so, cold pressing pressure 4MPa.The phase-change accumulation energy honeybee of preparation
Nest plate Exotherm Time extends 83%.
Embodiment 3
The ternary aliphatic acid eutectic of 63% mass ratio is mixed with lignin modification expanded vermiculite, mixture is carried out
Mechanical agitation 20min, it is to be mixed uniformly after put it into -0.1MPa, handled 30 minutes in 50 DEG C of vacuum drying chamber.Normal pressure
Absorption 3 hours.After absorption terminates, encapsulating material is placed on filter paper, is put into progress seepage experiment in 80 DEG C of air dry ovens,
And tested by seepage and determine maximal absorptive capacity.Room temperature is cooled to, that is, ternary aliphatic acid eutectic/lignin modification is made
Expanded vermiculite composite phase-change heat-storage material.Seepage occurs for composite.
Claims (5)
- A kind of 1. encapsulation phase-change thermal storage cellular board for green house of vegetables, it is characterised in that：The phase-change heat-storage material by stearic acid, The low blending ternary aliphatic acid of palmitic acid, capric acid and expanded vermiculite are combined；The preparation of the phase-change heat-storage material is to use first Lignin is organically-modified to expanded vermiculite progress, and then carries out carbonization treatment to lignin modification expanded vermiculite, obtains nano-sized carbon Layer expanded vermiculite, finally completes the encapsulation of phase-change material using vacuum immersion method；A certain amount of encapsulating material is put into cellular board In cellular aluminium core, by the preparation method of legacy cellular plate, plate is hot pressed into.
- A kind of 2. encapsulation phase-change thermal storage cellular board for green house of vegetables according to claim 1, it is characterised in that：Made Ternary aliphatic acid eutectic is that 12min distributed renderings are ultrasonically treated under the conditions of 70 DEG C by palmitic acid, capric acid, stearic acid Gained；Palmitic acid-capric acid binary of fatty acids eutectic, capric acid mass fraction 80~90%, mass fraction are wherein prepared first It is minimum binary eutectic when 84%, minimum 26.73 DEG C of eutectic temperature, then adds stearic acid and prepare palmitic acid-capric acid-tristearin Sour ternary aliphatic acid eutectic, stearic acid mass fraction are no more than 10%, are minimum ternary eutectic thing during mass fraction 6%, most 25.57 DEG C of eutectic point.
- A kind of 3. encapsulation phase-change thermal storage cellular board for green house of vegetables according to claim 1, it is characterised in that：Made Expanded vermiculite needs to be modified twice：Organically-modified and carbonizing and modifying；With biological material lignin to phase-change thermal storage Material progress is organically-modified, passes through the content that ion exchange principle controls load lignin；Carbonizing and modifying is carried out in Muffle furnace, Temperature sets 600 DEG C in an inert atmosphere, processing time 3h.
- A kind of 4. encapsulation phase-change thermal storage cellular board for green house of vegetables according to claim 1, it is characterised in that：The phase Change heat storage material is combined by ternary aliphatic acid eutectic and carbonizing and modifying expanded vermiculite, wherein the eutectic of ternary aliphatic acid Mass ratio shared by thing is 50~60%, and optimum quality ratio is 58%.
- A kind of 5. encapsulation phase-change thermal storage cellular board for green house of vegetables according to claim 1, it is characterised in that：Ternary Aliphatic acid eutectic overcomes the defects of single fat acid latent heat of phase change is low, phase transition temperature is high；Carbonizing and modifying expanded vermiculite is made Solve the problems, such as that the ternary aliphatic acid eutectic capacity of heat transmission is poor, easy seepage for encapsulating material, substantially increase storing discharging heat Efficiency；Composite shortens 58.3% compared to the heat accumulation time of ternary aliphatic acid eutectic, and Exotherm Time shortens 56.2%；In addition lignin carbonized product intercalation expanded vermiculite improves that ternary aliphatic acid eutectic heat release is uneven to ask Topic.
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Cited By (3)
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| CN109097003A (en) * | 2018-08-27 | 2018-12-28 | 上海交通大学 | With infiltrative heat chemistry heat accumulation shaped granule of optimization and preparation method thereof |
| CN110157387A (en) * | 2019-06-18 | 2019-08-23 | 福州大学 | High extinction, fatty acid/nano-complex PERFORMANCE OF MODIFIED VERMICULITE composite phase-change energy storage material of high thermal conductivity and preparation method thereof |
| CN110527494A (en) * | 2019-07-04 | 2019-12-03 | 浙江海洋大学 | A kind of preparation method of the mesoporous compound organic phase change material of silicon substrate high thermal conductivity |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109097003A (en) * | 2018-08-27 | 2018-12-28 | 上海交通大学 | With infiltrative heat chemistry heat accumulation shaped granule of optimization and preparation method thereof |
| CN109097003B (en) * | 2018-08-27 | 2020-06-09 | 上海交通大学 | Thermochemical heat storage molded particle with optimized permeability and preparation method thereof |
| CN110157387A (en) * | 2019-06-18 | 2019-08-23 | 福州大学 | High extinction, fatty acid/nano-complex PERFORMANCE OF MODIFIED VERMICULITE composite phase-change energy storage material of high thermal conductivity and preparation method thereof |
| CN110527494A (en) * | 2019-07-04 | 2019-12-03 | 浙江海洋大学 | A kind of preparation method of the mesoporous compound organic phase change material of silicon substrate high thermal conductivity |
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