Ternary fatty acid/modified expanded vermiculite composite phase-change energy storage material

[0027] (1) Mix capric acid, lauric acid, and myristic acid evenly in a weight ratio of 55.1:30.4:14.5, put it in a constant temperature water bath at 45°C, heat and stir for 30 minutes, and take it out to cool to room temperature after ultrasonication for 5 minutes; use differential scanning The phase transition temperature of capric acid / lauric acid / myristic acid ternary eutectic mixture measured by calorimetry is 16.43℃, and the latent heat of phase transition is 153.4J / g;

[0028] (2) Weigh 30g of expanded vermiculite and add it to 600g of distilled water, place it in a 60°C constant temperature water bath and stir vigorously for 40min, then add 105g of cetyltrimethylammonium bromide aqueous solution with a mass fraction of 1%, 70 Stir at constant temperature at ℃ for 2 hours, then keep warm in a water bath at 80℃ for 12h, stand at room temperature for 12h, then dry at 70℃ for 24h, then raise the temperature to 600℃ at a rate of 3℃ / min in a reducing atmosphere, and keep

[0031] (1) Mix capric acid, myristic acid, and stearic acid evenly in a weight ratio of 72.5:22.5:5.0, heat and stir in a constant temperature water bath at 70°C for 30 minutes, take it out and cool it to room temperature after ultrasonication for 5 minutes; The phase transition temperature of capric acid / myristic acid / stearic acid ternary eutectic mixture was determined by thermal method to be 24.02°C, and the latent heat of phase transition was 156.3J / g.

[0032](2) Weigh 30g of expanded vermiculite and add it to 600g of distilled water, place it in a constant temperature water bath at 70°C and stir vigorously for 60min, then add 105g of cetyltrimethylammonium bromide aqueous solution with a mass fraction of 5%, 60 Stir at constant temperature at ℃ for 4 hours, keep warm in a water bath at 85°C for 10 hours, let stand at room temperature for 15 hours, then dry at 80°C for 48 hours, then raise the temperature to 700°C at a rate of 1°C / min under a reducing atmosphere, and

[0035] (1) Mix myristic acid, palmitic acid, and stearic acid evenly in a weight ratio of 51.3:33.2:15.5, put them in a constant temperature water bath at 65°C, heat and stir for 30 minutes, and take them out to cool to room temperature after ultrasonication for 5 minutes; The phase transition temperature of myristic acid / palmitic acid / stearic acid ternary eutectic mixture was determined by scanning calorimetry to be 39.62°C, and the latent heat of phase transition was 177.5J / g.

[0036] (2) Weigh 30g of expanded vermiculite and add it to 600g of distilled water, place it in a constant temperature water bath at 80°C and stir vigorously for 20min, then add 105g of cetyltrimethylammonium bromide aqueous solution with a mass fraction of 10%, 80 Stir at a constant temperature of ℃ for 2 hours, keep warm in a water bath at 90 ℃ for 8 hours, let stand at room temperature for 10 hours, then dry at 70 ℃ for 72 hours, then raise the temperature to 800 ℃ at a rate of 5 ℃ / min under a