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Process for producing stephanoporate composite inorganic phase-changing material

A technology of inorganic phase change materials and porous materials, which is applied in the field of preparation of porous material composite inorganic phase change materials, can solve difficult durability problems, limit the popularization and application of hydrated salt phase change materials, and reduce the phase change of phase change materials Enthalpy and other issues, to achieve the effect of reducing packaging technology, solving stability problems, and solving compatibility problems

Inactive Publication Date: 2008-10-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the analysis of previous research results found that although a lot of research has been done on the thermal stability technology of hydrated salt phase change materials, while improving its thermal stability, adding other substances reduces the phase change enthalpy of phase change materials, and the adopted Adsorption of porous materials is often difficult to solve their durability problems, which greatly limit the popularization and application of hydrated salt phase change materials

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0025] A preparation method of a porous composite inorganic phase change material, comprising the steps of:

[0026] 1) According to the mass ratio of hydrated salt phase change material: porous material: pore sealing agent = 15:10:1, select hydrated salt phase change material, porous material and pore sealing agent for use; wherein, the hydrated salt phase change The material is Na 2 SO 4 10H 2 O; the porous material is montmorillonite (Xinyang, Henan, expansion multiple 18-30, water content≤10%) in the range of 1-1000 nanometer scale; the pore sealing agent is the modulus M 0 Between 1.5-2.0, NaO and SiO in the system 2 The mass percentage of water glass should be greater than 4.5% and 9.5% respectively;

[0027] 2) Add the hydrated salt phase change material into water to make a saturated solution at 40°C, then add it to the porous material and stir for 1-5 hours, seal and age for 12-48 hours, add a pore sealing agent to fully stir for 4-8 hours, and air dry , crushing...

Embodiment 2

[0030] A preparation method of a porous composite inorganic phase change material, comprising the steps of:

[0031] 1) According to the mass ratio of hydrated salt phase change material: porous material: pore sealing agent = 15:10:1, select hydrated salt phase change material, porous material and pore sealing agent for use; wherein, the hydrated salt phase change The material is NaOAc·3H 2 O; the porous material is illite in the range of 1-1000 nanometers (Xinyang, Henan, expansion factor 25-30, water content≤10%); the pore sealing agent is the modulus M 0 Between 1.5-2.0, NaO and SiO in the system 2 The mass percentage of water glass should be greater than 4.5% and 9.5% respectively;

[0032] 2) Add the hydrated salt phase change material into water to make a saturated solution at 25°C, then add it to the porous material and stir for 1-5 hours, seal and age for 12-48 hours, add a pore sealing agent to fully stir for 4-8 hours, and air dry , crushing, that is, the porous c...

Embodiment 3

[0034] A preparation method of a porous composite inorganic phase change material, comprising the steps of:

[0035] 1) According to the mass ratio of hydrated salt phase change material: porous material: pore sealing agent = 10:5:1, select hydrated salt phase change material, porous material and pore sealing agent for use; wherein, the hydrated salt phase change The material is Na 2 SO 4 10H 2 O, the porous material is illite (Xinyang, Henan, expansion multiple 25-30, water content ≤ 10%), and the pore sealing agent is water glass;

[0036] 2) Add the hydrated salt phase change material into water to make a saturated solution at 25°C, then add it to the porous material and stir for 1 hour, age for 12 hours, add a pore sealing agent and stir for 4 hours, air-dry and crush to form a porous compound Inorganic phase change material products.

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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 [0001] The invention belongs to the field of building materials, and in particular relates to a preparation method of a porous material composite inorganic phase change material. Background technique [0002] Phase change materials have a wide range of applications in energy storage and utilization. Inorganic hydrated salt-based materials are an important class of room-temperature phase-change materials, which have broad application prospects due to their closeness to room temperature, although crystalline hydrated salts provide nearly 70 alternative PCMs with melting points ranging from 0°C to 100°C , and the price is cheap, the volume heat storage density is large, the heat of solution is large, the thermal conductivity is large, and neutral, but it has a huge impact on the durability of building materials. There have been a large number of research reports at home and abroad on the modification of hydrated salt phase change materials, and there are a larg...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 马保国蹇守卫金磊张琴朱艳超
Owner WUHAN UNIV OF TECH
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