Nanocomposite phase change energy storage material with high cycle life and preparation method thereof
A technology of phase change energy storage materials and cycle life, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of supercooling, phase change crystallization instability, phase stratification, etc., and achieve long cycle life and phase Variable temperature stability and good thermal stability
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[0033] Another embodiment of the present invention proposes a kind of preparation method of the nanocomposite phase change energy storage material with high cycle life, it comprises the following steps:
[0034] (1) heating sodium acetate trihydrate to complete melting, adding nano-dispersant, viscosity regulator and nucleating agent, stirring to obtain heterogeneous colloidal dispersion;
[0035] (2) Add the water-retaining agent into soft water, and sonicate until the water-retaining agent is saturated with water to obtain a mixture;
[0036] (3) adding the mixture into the heterogeneous colloidal dispersion system, stirring and reacting at 70-100°C for 60-90 minutes, cooling and crystallizing to obtain a nanocomposite phase-change energy storage material with high cycle life;
[0037] Wherein, the weight ratio of sodium acetate trihydrate, nano-dispersant, viscosity regulator, nucleating agent, water-holding agent and soft water is 80-90:0.05-5:1-4:0.1-5:0.5- 10: 1-10; the...
Embodiment 1
[0047] (1) Heat 80g of sodium acetate trihydrate at 85°C until completely melted, add 3g of nano-zirconia with a particle size of 7nm, 4g of hydroxyethyl cellulose with a particle size of 380 mesh and 1g of disodium hydrogen phosphate dodecahydrate, and stir , to obtain heterogeneous colloidal dispersion system;
[0048] (2) Add 2 g of polyurethane sponge crumbs to 10 g of soft water, and ultrasonicate for 30 minutes until the polyurethane sponge crumbs are saturated with water to obtain a mixture;
[0049] (3) Add the mixture into the heterogeneous heterogeneous colloidal dispersion system, stir and react at 80° C. for 60 minutes, cool and crystallize, and obtain a nanocomposite phase change energy storage material with high cycle life.
[0050] The phase change crystallization T-t curve of the phase change energy storage material of the present embodiment is as follows figure 1 shown by figure 1 It can be seen that the phase change temperature of the phase change energy st...
Embodiment 2
[0052] In the present invention, the phase change energy storage material can be prepared by replacing sodium acetate trihydrate with a mixture of anhydrous sodium acetate and soft water, wherein the specific preparation method of anhydrous sodium acetate and soft water is as follows:
[0053] Add 2g of bentonite and 1g of diatomaceous earth into 40g of soft water, and ultrasonicate for 30 minutes to make the bentonite and diatomite fully saturated with water, and the surface is completely wetted to obtain a mixture. Add 51g of anhydrous sodium acetate and heat Stir, continue to add 3g of nano-titanium dioxide with a particle size of 40nm, 1g of sodium formate and 3g of hydroxyethyl cellulose with a particle size of 420 mesh, heat and stir at 78°C for 60min, cool and crystallize, and obtain a nanocomposite phase change energy storage with high cycle life Material.
[0054] The phase change crystallization T-t curve of the phase change energy storage material of the present emb...
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