Cement-based composite phase change heat storage and temperature adjustment material based on mixed ester phase change microcapsules

Abstract

Relating to the field of phase change heat storage and temperature adjustment building materials, the invention discloses a cement-based composite phase change heat storage and temperature adjustmentmaterial based on mixed ester phase change microcapsules. According to the invention, the mixed ester phase change microcapsule with a double-layer shell structure is compounded with a cement-based material to obtain the composite phase change heat storage and temperature adjustment material, and the double-layer shell structure of the microcapsules can play a role in reducing the breakage of themicrocapsules in the mixing process, thereby facilitating the durability of the composite phase change material. The prepared cement-based composite phase change material based on mixed ester phase change microcapsules has the effects of heat storage and temperature adjustment, and has the possibility of application in energy-saving buildings.

Description

Technical field

[0001] The invention relates to the field of phase change heat storage and temperature adjustment building materials, and relates to a preparation method of a cement-based composite phase change heat storage and temperature adjustment material based on mixed ester phase change microcapsules. Background technique

[0002] Research shows that my country's building energy consumption accounts for about 24% of total energy consumption, of which heating and air conditioning energy consumption accounts for about 50% of building energy consumption. It can be seen that reducing heating and air conditioning energy consumption is of great significance to achieving building energy saving . Combining phase change materials with building materials to make composite phase change heat storage and temperature regulation building materials and apply them to building roofs, walls, floors and other enclosure structures can delay indoor temperature changes, reduce heating and air cond...

Examples

Embodiment 1

[0023] Mix deionized water, poly(ethylene-alt-maleic anhydride), urea, ammonium chloride and resorcinol at a mass ratio of 500:2.5:10:1:1, and use 0.1mol / L sodium hydroxide solution Adjust the pH to 3.50 as the water phase. Mix methyl palmitate and methyl stearate at a mass ratio of 9:1 as a mixed ester. Supraec 2644 is mixed with mixed ester as the oil phase, and the mass fraction of Supraec 2644 in the oil phase is 5%. The oil phase and the water phase are mixed and emulsified at 400 rpm to obtain an emulsion. The mass fraction of the oil phase in the emulsion is 16%. Then add a 37wt% formaldehyde solution with a mass 4 times the mass of urea in the water phase to the emulsion, increase the temperature to 55°C for 4 hours, wash the product with deionized water and ethanol three times, filter, and air dry to obtain mixed ester phase change microcapsules .

[0024] Mix 70% by mass of ordinary Portland cement (PO 42.5), 24.9% by mass of water, 5% by mass of mixed ester phase ch...

Embodiment 2

[0026] Mix deionized water, poly(ethylene-alt-maleic anhydride), urea, ammonium chloride and resorcinol at a mass ratio of 500:2.5:10:1:1, and use 0.01mol / L sodium hydroxide solution Adjust the pH to 3.50 as the water phase. Mix methyl palmitate and methyl stearate at a mass ratio of 9:1 as a mixed ester. Supraec 2644 is mixed with mixed ester as the oil phase, and the mass fraction of Supraec 2644 in the oil phase is 20%. The oil phase and the water phase are mixed and emulsified at 200 rpm to obtain an emulsion. The mass fraction of the oil phase in the emulsion is 18%. Then add 37wt% formaldehyde solution with a mass of 4 times the mass of urea in the water phase to the emulsion, raise the temperature to 55°C and keep it for 4 hours, wash the product with deionized water and ethanol three times, filter and air dry, to obtain mixed ester phase change microcapsules .

[0027] Mix 50% of ordinary Portland cement (PO 42.5), 24.95% of water, 25% of mixed ester phase change micro...

Embodiment 3

[0029] Mix deionized water, poly(ethylene-alt-maleic anhydride), urea, ammonium chloride and resorcinol at a mass ratio of 500:2.5:10:1:1, and use 0.5mol / L sodium hydroxide solution Adjust the pH to 3.50 as the water phase. Mix methyl palmitate and methyl stearate at a mass ratio of 9:1 as a mixed ester. The isophorone diisocyanate is mixed with the mixed ester as an oil phase, and the mass fraction of the isophorone diisocyanate in the oil phase is 10%. The oil phase and the water phase are mixed and emulsified at 600 rpm to obtain an emulsion. The mass fraction of the oil phase in the emulsion is 14%. Then add a 37wt% formaldehyde solution with a mass 4 times the mass of urea in the water phase to the emulsion, increase the temperature to 55°C and keep it for 4 hours, wash the product with deionized water and ethanol three times, filter and air dry to obtain mixed ester phase change microcapsules .

[0030] Mix 65% by mass of ordinary Portland cement (PO 42.5), 19.94% by mas...

Technical field

[0001] The invention relates to the field of phase change heat storage and temperature adjustment building materials, and relates to a preparation method of a cement-based composite phase change heat storage and temperature adjustment material based on mixed ester phase change microcapsules. Background technique

[0002] Research shows that my country's building energy consumption accounts for about 24% of total energy consumption, of which heating and air conditioning energy consumption accounts for about 50% of building energy consumption. It can be seen that reducing heating and air conditioning energy consumption is of great significance to achieving building energy saving . Combining phase change materials with building materials to make composite phase change heat storage and temperature regulation building materials and apply them to building roofs, walls, floors and other enclosure structures can delay indoor temperature changes, reduce heating and air cond...

Examples

Embodiment 1

[0023] Mix deionized water, poly(ethylene-alt-maleic anhydride), urea, ammonium chloride and resorcinol at a mass ratio of 500:2.5:10:1:1, and use 0.1mol / L sodium hydroxide solution Adjust the pH to 3.50 as the water phase. Mix methyl palmitate and methyl stearate at a mass ratio of 9:1 as a mixed ester. Supraec 2644 is mixed with mixed ester as the oil phase, and the mass fraction of Supraec 2644 in the oil phase is 5%. The oil phase and the water phase are mixed and emulsified at 400 rpm to obtain an emulsion. The mass fraction of the oil phase in the emulsion is 16%. Then add a 37wt% formaldehyde solution with a mass 4 times the mass of urea in the water phase to the emulsion, increase the temperature to 55°C for 4 hours, wash the product with deionized water and ethanol three times, filter, and air dry to obtain mixed ester phase change microcapsules .

[0024] Mix 70% by mass of ordinary Portland cement (PO 42.5), 24.9% by mass of water, 5% by mass of mixed ester phase ch...

Embodiment 2

[0026] Mix deionized water, poly(ethylene-alt-maleic anhydride), urea, ammonium chloride and resorcinol at a mass ratio of 500:2.5:10:1:1, and use 0.01mol / L sodium hydroxide solution Adjust the pH to 3.50 as the water phase. Mix methyl palmitate and methyl stearate at a mass ratio of 9:1 as a mixed ester. Supraec 2644 is mixed with mixed ester as the oil phase, and the mass fraction of Supraec 2644 in the oil phase is 20%. The oil phase and the water phase are mixed and emulsified at 200 rpm to obtain an emulsion. The mass fraction of the oil phase in the emulsion is 18%. Then add 37wt% formaldehyde solution with a mass of 4 times the mass of urea in the water phase to the emulsion, raise the temperature to 55°C and keep it for 4 hours, wash the product with deionized water and ethanol three times, filter and air dry, to obtain mixed ester phase change microcapsules .

[0027] Mix 50% of ordinary Portland cement (PO 42.5), 24.95% of water, 25% of mixed ester phase change micro...

Embodiment 3

[0029] Mix deionized water, poly(ethylene-alt-maleic anhydride), urea, ammonium chloride and resorcinol at a mass ratio of 500:2.5:10:1:1, and use 0.5mol / L sodium hydroxide solution Adjust the pH to 3.50 as the water phase. Mix methyl palmitate and methyl stearate at a mass ratio of 9:1 as a mixed ester. The isophorone diisocyanate is mixed with the mixed ester as an oil phase, and the mass fraction of the isophorone diisocyanate in the oil phase is 10%. The oil phase and the water phase are mixed and emulsified at 600 rpm to obtain an emulsion. The mass fraction of the oil phase in the emulsion is 14%. Then add a 37wt% formaldehyde solution with a mass 4 times the mass of urea in the water phase to the emulsion, increase the temperature to 55°C and keep it for 4 hours, wash the product with deionized water and ethanol three times, filter and air dry to obtain mixed ester phase change microcapsules .

[0030] Mix 65% by mass of ordinary Portland cement (PO 42.5), 19.94% by mas...

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