A kind of porous alumina composite shaped phase change material and its preparation method
A technology of porous alumina and phase change materials, applied in chemical instruments and methods, botanical equipment and methods, heat exchange materials, etc., can solve the problems of difficult to ensure plant growth temperature, large thermal conductivity, phase stratification and liquid phase Leakage and other problems, to achieve the effect of enhancing heat storage and discharge function, large specific surface area, and improving temperature regulation
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example 1
[0049] Raw material ratio: Na 2 SO 4 10H 2 O 70wt%, porous alumina 30wt%; preparation steps are as follows ( Figure 4 ):
[0050] First, weigh 20g Na with an electronic balance 2 SO 4 10H 2 O, put it in a beaker, seal the beaker with plastic wrap, place it in a constant temperature water bath at 50°C and heat it for 1 hour to obtain a molten sample.
[0051] Then take out the beaker, uncover the plastic wrap, add porous alumina to the molten sample, cover the plastic wrap and continue to stir and mix at 50°C for 2 hours to make the raw materials evenly stirred. Finally, peel off the plastic wrap, put the beaker into a vacuum drying oven, use a vacuum pump to remove the air in the drying oven until the pressure of the vacuum drying oven is 40kpa, and vacuum physical adsorption for 4 hours at room temperature to prepare a porous alumina composite shaped phase transition Material( Figure 6 ).
[0052] The step cooling curve (see image 3 ) and the DSC curve at a heati...
example 2
[0054] Raw material ratio: Na 2 SO 4 10H 2 O 80wt%, porous alumina 20wt%; The preparation steps are as follows ( Figure 4 ):
[0055] First, weigh 20g Na with an electronic balance 2 SO 4 10H 2 O, put it in a beaker, seal the beaker with plastic wrap, place it in a constant temperature water bath at 50°C and heat it for 1 hour to obtain a molten sample.
[0056] Then take out the beaker, uncover the plastic wrap, add porous alumina to the molten sample, cover the plastic wrap and continue to stir and mix at 50°C for 2 hours to make the raw materials evenly stirred. Finally, peel off the plastic wrap, put the beaker into a vacuum drying oven, use a vacuum pump to remove the air in the drying oven until the pressure of the vacuum drying oven is 40kpa, and vacuum physical adsorption for 4 hours at room temperature to prepare a porous alumina composite shaped phase transition Material.
[0057] The step cooling curve of the obtained composite shaped phase change material ...
example 3
[0059] Raw material ratio: Na 2 SO 4 10H 2 O 90wt%, porous alumina 10wt%; preparation steps are as follows ( Figure 4 ):
[0060] First, weigh 20g Na with an electronic balance 2 SO 4 10H 2 O, put it in a beaker, seal the beaker with plastic wrap, place it in a constant temperature water bath at 50°C and heat it for 1 hour to obtain a molten sample.
[0061] Then take out the beaker, uncover the plastic wrap, add porous alumina to the molten sample, cover the plastic wrap and continue to stir and mix at 50°C for 2 hours to make the raw materials evenly stirred. Finally, peel off the plastic wrap, put the beaker in a vacuum drying oven, use a vacuum pump to remove the air in the drying oven until the pressure of the vacuum drying oven is 35kpa, and vacuum physical adsorption for 4 hours at room temperature to prepare a porous alumina composite shaped phase transition Material.
[0062] The step cooling curve of the obtained composite shaped phase change material at a c...
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