CN101294064A - Process for producing stephanoporate composite inorganic phase-changing material - Google Patents
Process for producing stephanoporate composite inorganic phase-changing material Download PDFInfo
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- CN101294064A CN101294064A CNA2008100481595A CN200810048159A CN101294064A CN 101294064 A CN101294064 A CN 101294064A CN A2008100481595 A CNA2008100481595 A CN A2008100481595A CN 200810048159 A CN200810048159 A CN 200810048159A CN 101294064 A CN101294064 A CN 101294064A
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Abstract
The invention relates to the preparation method of a composite porous inorganic phase-change material. The preparation method of the composite porous inorganic phase-change material is characterized in that the method comprises the following steps: (1) selecting a hydrate phase-change material, a porous material and a hole sealing agent in a weight ratio of (10 to 15):(5 to 10):1 for later use, wherein the hydrate phase-change material is an inorganic material with hydrate crystals, and the porous material has micropores within the range of 1 to 1,000 nm; and (2) adding the hydrate phase-change material into water to obtain saturated solution, adding into the porous material, stirring, aging for 12 to 48 h, adding the hole sealing agent, stirring completely for 4 to 8 h, air-drying, and crushing to obtain the porous inorganic phase-change material. The method solves the stability problem of the phase-change material as well as the problem in compatibility of the phase-change material with other construction materials, and has the advantages of simple process and low cost.
Description
Technical field
The invention belongs to building material field, be specifically related to a kind of preparation method of porous mass composite inorganic phase-changing material.
Background technology
Phase change material has widely in the energy storage and aspect utilizing to be used.Inorganic hydrated salt class material is the important normal temperature phase change material of a class, because itself and room temperature are approaching, thereby have broad application prospects, although crystalline hydrate salt provides the nearly 70 kinds of alternative PCM from 0 ℃ to 100 ℃ of fusing points, and low price, the volume storage density is big, solution heat is big, thermal conductivity is big, neutral, but because it has caused tremendous influence to the weather resistance of material of construction.About the study on the modification of hydration salt phase change material, existing big both at home and abroad quantity research report, and lot of documents is arranged:
Major technique content in these documents is:
The technology of preparing of hydration salt phase change material, for the mistake of controlling phase change material cold with problem such as crystallization, add material similar usually, or nucleator or anti-phase separation agent etc. with it; The ubiquitous subject matter of crystalline hydrate salt was the cold-peace crystallization.In the phase transition process, also non-crystallizable when material is cooled to zero pour, be called " cold excessively " and need be cooled to just begin below the zero pour crystalline phenomenon.It is caused by the relatively poor nucleation performance of crystalline hydrate salt crossing cold, and the way of solution is to add nucleator or adopt so-called " cold finger " method, and promptly the retaining part solid phase change material does not melt, and makes it to become nucleator.Crystallization is when crystalline hydrate salt is heated to the above temperature of fusing point, and the salt of generation can not be dissolved in the water fully and be deposited in the phenomenon of container bottom.Crystallization can make crystalline hydrate salt be separated in heating-process of cooling, and heat storage performance descends thereupon.The way that solves generally has: add thickening material; Add crystalline structure and change agent; The container of splendid attire phase change material adopts laminate structure; In process of cooling, rock or stir.
Hydration salt phase change material is mainly used in porous material absorption, as utilizes cellular concrete absorption Na2SO410H2O to prepare phase change material material of construction etc.
But analyzing previous finding finds, though the thermally-stabilised technology of hydration salt phase change material has big quantity research, but when improving its thermostability, add other material and reduced the enthalpy of phase change of phase change material, and the porous material that adopts absorption often is difficult to solve its endurance issues, and these problems have limited applying of hydration salt phase change material greatly.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of stephanoporate composite inorganic phase-changing material, the phase change material of this method preparation has Heat stability is good, characteristics with low cost, and this method technology is simple.
To achieve these goals, technical scheme of the present invention is: a kind of preparation method of stephanoporate composite inorganic phase-changing material is characterized in that it comprises the steps:
1) by hydration salt phase change material: porous material: the mass ratio=10-15 of hole encapsulant: 5-10: 1, choose hydration salt phase change material, porous material and hole encapsulant, standby; Wherein, hydration salt phase change material is for having the crystal-like inorganic substance of salt hydrate, and porous material is for having the porous material of micropore in 1-1000 nanoscale scope, and the hole encapsulant is inorganic materials or organic one-tenth film material based on sal;
2) hydration salt phase change material added make saturated solution in the entry, join then in the porous material stir, ageing 12-48h, add the hand-hole encapsulant and fully stir 4-8h, air-dry, broken, promptly get the stephanoporate composite inorganic phase-changing material product.
Described hydration salt phase change material is Na
2SO
410H
2O, CaCl
26H
2O, Na
2HPO
46H
2O or NaOAc3H
2O etc.
Described porous material is the material that illite, montmorillonite or pearlstone etc. have porous character.
Described hole encapsulant is water glass or small molecules ether of cellulose etc.
The invention has the beneficial effects as follows:
1) adopts porous material that hydration salt phase change material is adsorbed, seal the crystallization problem that can prevent phase change material with the hole encapsulant simultaneously and take place, help keeping the thermostability of material system;
2) porous material of Cai Yonging and hydration salt phase change material have chemical 'inertia', can not react and reduce its chemical stability;
3) the hole encapsulant of Cai Yonging can form with porous material surface and have the material of certain intensity, and can not enter the porous material interlayer.
4), compare with other inorganic hydrated salt class phase change materials, can solve its thermal stability problems, providing for the mass-producing utilization of this type of phase change material may;
5), owing to adopt the composite system of porous material+hole encapsulant, the possibility that the thermal property of having avoided employing to prevent that cryogen and anti-nucleator caused reduces;
6), since phase change material of the present invention have stable profile, reduced the encapsulation technology of phase change material, solved the compatibility problem of material and other material of construction simultaneously;
7), this phase change material preparation technology is simple, cost is lower.
The present invention has the stability problem that has both solved phase change material, has solved the compatibility problem of phase change material and other material of construction simultaneously again, and technology advantage simple, with low cost.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
A kind of preparation method of stephanoporate composite inorganic phase-changing material, it comprises the steps:
1) by hydration salt phase change material: porous material: the mass ratio of hole encapsulant=15: 10: 1, choose hydration salt phase change material, porous material and hole encapsulant, standby; Wherein, hydration salt phase change material is Na
2SO
410H
2O; Porous material is at the montmorillonite of 1-1000 nanoscale scope (Xinyang, Henan, expansion multiple 18-30, water content≤10%); The hole encapsulant is modulus M
0Between 1.5-2.0, NaO and SiO in the system
2Mass percent should be respectively greater than 4.5% and 9.5% water glass;
2) hydration salt phase change material is added in the entry under 40 ℃, make saturated solution, join then and stir 1-5h in the porous material, sealing ageing 12-48h adds the hand-hole encapsulant and fully stirs 4-8h, air-dry, broken, promptly get the stephanoporate composite inorganic phase-changing material product.
Prepared stephanoporate composite inorganic phase-changing material after tested, its transformation temperature is 32-75 ℃, enthalpy of phase change 1088kJ/kg, through thermodynamic cycle, its thermostability satisfies actual service requirements.
Embodiment 2:
A kind of preparation method of stephanoporate composite inorganic phase-changing material, it comprises the steps:
1) by hydration salt phase change material: porous material: the mass ratio of hole encapsulant=15: 10: 1, choose hydration salt phase change material, porous material and hole encapsulant, standby; Wherein, hydration salt phase change material is NaOAc3H
2O; Porous material is at the illite of 1-1000 nanoscale scope (Xinyang, Henan, expansion multiple 25-30, water content≤10%); The hole encapsulant is modulus M
0Between 1.5-2.0, NaO and SiO in the system
2Mass percent should be respectively greater than 4.5% and 9.5% water glass;
2) hydration salt phase change material is added in the entry under 25 ℃, make saturated solution, join then and stir 1-5h in the porous material, sealing ageing 12-48h adds the hand-hole encapsulant and fully stirs 4-8h, air-dry, broken, promptly get the stephanoporate composite inorganic phase-changing material product.
Embodiment 3:
A kind of preparation method of stephanoporate composite inorganic phase-changing material, it comprises the steps:
1) by hydration salt phase change material: porous material: the mass ratio of hole encapsulant=10: 5: 1, choose hydration salt phase change material, porous material and hole encapsulant, standby; Wherein, hydration salt phase change material is Na
2SO
410H
2O, porous material are illite (Xinyang, Henan, expansion multiple 25-30, water content≤10%), and the hole encapsulant is a water glass;
2) hydration salt phase change material is added in the entry under 25 ℃, make saturated solution, join then and stir 1h, ageing 12h in the porous material, add the hand-hole encapsulant and fully stir 4h, air-dry, broken, promptly get the stephanoporate composite inorganic phase-changing material product.
Embodiment 4:
A kind of preparation method of stephanoporate composite inorganic phase-changing material, it comprises the steps:
1) by hydration salt phase change material: porous material: the mass ratio of hole encapsulant=12: 8: 1, choose hydration salt phase change material, porous material and hole encapsulant, standby; Wherein, hydration salt phase change material is CaCl
26H
2O, porous material are pearlstone (Xinyang, Henan, acceptable end product), and the hole encapsulant is commercially available small molecules ether of cellulose;
2) hydration salt phase change material is added make saturated solution in the entry, join then and stir 2h, ageing 24h in the porous material, add the hand-hole encapsulant and fully stir 5h, air-dry, broken, promptly get the stephanoporate composite inorganic phase-changing material product.
Embodiment 5:
A kind of preparation method of stephanoporate composite inorganic phase-changing material, it comprises the steps:
1) by hydration salt phase change material: porous material: the mass ratio of hole encapsulant=15: 10: 1, choose hydration salt phase change material, porous material and hole encapsulant, standby; Wherein, hydration salt phase change material is Na
2HPO
46H
2O, porous material are pearlstone (Xinyang, Henan, acceptable end product), and the hole encapsulant is commercially available small molecules ether of cellulose;
2) hydration salt phase change material is added make saturated solution in the entry, join then and stir 5h, ageing 48h in the porous material, add the hand-hole encapsulant and fully stir 8h, air-dry, broken, promptly get the stephanoporate composite inorganic phase-changing material product.
Claims (4)
1. the preparation method of a stephanoporate composite inorganic phase-changing material is characterized in that it comprises the steps:
1) by hydration salt phase change material: porous material: the mass ratio=10-15 of hole encapsulant: 5-10: 1, choose hydration salt phase change material, porous material and hole encapsulant, standby; Wherein, hydration salt phase change material is for having the crystal-like inorganic substance of salt hydrate, and porous material is for having the porous material of micropore in 1-1000 nanoscale scope, and the hole encapsulant is inorganic materials or organic one-tenth film material based on sal;
2) hydration salt phase change material added make saturated solution in the entry, join then in the porous material stir, ageing 12-48h, add the hand-hole encapsulant and fully stir 4-8h, air-dry, broken, promptly get the stephanoporate composite inorganic phase-changing material product.
2. the preparation method of a kind of stephanoporate composite inorganic phase-changing material according to claim 1, it is characterized in that: described hydration salt phase change material is Na
2SO
410H
2O, CaCl
26H
2O, Na
2HPO
46H
2O or NaOAc3H
2O.
3. the preparation method of a kind of stephanoporate composite inorganic phase-changing material according to claim 1, it is characterized in that: described porous material is illite, montmorillonite or pearlstone.
4. the preparation method of a kind of stephanoporate composite inorganic phase-changing material according to claim 1, it is characterized in that: described hole encapsulant is water glass or small molecules ether of cellulose.
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| CN101967857A (en) * | 2010-10-11 | 2011-02-09 | 盐城工学院 | Phase change thermal storage board, preparation method thereof and thermal storage device using the phase change thermal storage board |
| CN101974313A (en) * | 2010-09-26 | 2011-02-16 | 李宙确 | Phase change thermal storage material and manufacturing method thereof |
| CN102337105A (en) * | 2010-07-26 | 2012-02-01 | 李宙确 | Phase-change thermal storage material |
| CN101760182B (en) * | 2009-05-14 | 2012-06-27 | 肖吕明 | Phase-change constant-temperature material |
| CN103194179A (en) * | 2013-04-01 | 2013-07-10 | 河南理工大学 | Composite phase change heat storage material and preparation method thereof |
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