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Preparation of organic inorganic composite phase-change material

A technology of inorganic composite and phase change materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of the influence of the phase change potential of inorganic-organic composite phase change materials, the easy fragmentation of porous media, and the reduction of adsorption capacity , to achieve the effect of streamline operation and industrialized production, easy control of the operation process, and maintenance of integrity

Inactive Publication Date: 2009-01-21
贵州中益能新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the porous medium needs to be preheated first, the process becomes complicated. In addition, because the pressure in the reactor is directly reduced to the maximum negative pressure, the porous medium is easily broken during the stirring process under the maximum negative pressure, and the particle size The smaller the size, the lower the adsorption capacity of the porous medium to the organic material, which will affect the phase change potential of the obtained inorganic-organic composite phase change material

Method used

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  • Preparation of organic inorganic composite phase-change material
  • Preparation of organic inorganic composite phase-change material

Examples

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Embodiment 1

[0039] In this embodiment, the inorganic porous mineral carrier is expanded perlite with a particle size of 3-5mm; the organic phase-change material is paraffin (solid), its phase-change enthalpy is 180-220J / g, and its phase-change temperature is 25-30°C.

[0040] The preparation process is:

[0041] First, add 20 grams of expanded perlite of 3 to 5mm into the vacuum reactor. The temperature of the water bath in the vacuum reactor is controlled at about 80°C. Open the liquid feed valve and add 20 grams of paraffin (heat first to make it liquid) and stir; after 3 minutes, open the exhaust valve to pump the vacuum reactor to a negative pressure of 0.095MPa, and continue stirring to make the paraffin completely covered by the expanded perlite Adsorption; After 10 minutes, stop the reaction, close the pumping valve and open the inlet valve, wait until the reactor is under normal pressure and open the discharge valve to obtain 40 grams of the composite phase change material of expa...

Embodiment 2

[0051] In this embodiment, the inorganic porous mineral carrier is expanded perlite with a particle size of 3 to 5 mm; the organic phase change material is a mixed phase change material of liquid paraffin and octadecane (the weight ratio of liquid paraffin and octadecane is 1:8) , its phase change enthalpy is 178~204J / g, and the phase change temperature is 27~35°C.

[0052] The preparation process is:

[0053] First, add 20 grams of expanded perlite to the vacuum reactor. The temperature of the water bath in the vacuum reactor is controlled at about 80 ° C. Then, the vacuum reactor is evacuated to a negative pressure of 0.05 MPa, and the pumping valve is closed and the liquid feed valve is opened at the same time. Add a mixture of 35 grams of liquid paraffin and octadecane and stir; after 3 minutes, open the exhaust valve to pump the vacuum reactor to a negative pressure of 0.095MPa, and continue stirring to make the liquid paraffin and octadecane fully absorbed by the expande...

Embodiment 3

[0057] In this embodiment, the inorganic porous mineral carrier is sepiolite, with a particle size of 0.5-1 mm; the organic phase change material is a mixed phase change material of liquid paraffin and octadecane (the weight ratio of liquid paraffin and octadecane is 1:5) , its phase change enthalpy is 167~192J / g, and the phase change temperature is 25~35°C.

[0058] The preparation process of the composite material is the same as in Example 2.

[0059] The product of this example is detected with the same method as in Example 1, the result: observation and analysis under an optical microscope, the organic material (the mixture of liquid paraffin and octadecane) has completely entered the pores of the sepiolite particles, and the composite material particles The integrity is good, the particle size is 0.2-0.5mm, the particle size change rate is 20-40%, the adsorption amount of organic materials reaches 50% and the adsorption amount is stable, the phase change enthalpy is 80-10...

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Abstract

The invention relates to a method for preparing an organic and inorganic composite phase-transition material. The method comprises the following steps: firstly, inorganic porous minerals are added into a reaction kettle; and secondly, the reaction kettle is vacuumized and injected with an organic material and then pumped into the state of negative pressure, and the temperature and the stirring speed are required to be adequately controlled during the reaction process. The method takes the inorganic porous mineral materials as a carrier for vacsorb of organic phase-transition materials which accord with the phase-transition requirements; the composite phase-transition material product prepared has the characteristics of no leakage, inflaming retarding, high phase-transition potential, easily controllable phase-transition temperature and so on; and the preparation method has a simple technology and low cost, has no secondary pollution, and is suitable for flow production and industrial production.

Description

technical field [0001] The invention relates to the field of building energy-saving materials, in particular to an organic-inorganic composite phase-change material with a phase-change temperature-regulating function used in the building field and a preparation method thereof. Background technique [0002] In recent years, problems such as the depletion of mineral energy and environmental pollution have become more and more prominent. Improving energy efficiency and developing renewable energy have become important issues facing mankind. Phase change materials (Phase Change Materials, PCM) can absorb or release a large amount of latent heat during the phase change process, and can be widely used in the fields of heat storage and temperature control, and have developed rapidly in European and American countries in the past 20 years. Phase change energy storage composite material is a kind of thermal functional composite material, which can store energy in its carrier in the f...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 李海建冀志江王静侯国艳王晓燕王继梅丁楠
Owner 贵州中益能新材料科技有限公司
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