Phase change cold storage material with double phase change points and preparation method thereof

Abstract

The invention discloses a phase change cold storage material with double phase change points and a preparation method thereof. The phase change cold storage material with double phase change points is prepared from the following raw materials in percentage by weight: 0 to 60 percent of inorganic salts, 5 to 60 percent of organic phase change materials, 20 to 95 percent of de-ionized water, 0.1 to 2 percent of surfactants, 1 to 5 percent of thickening agents and 1 to 5 percent of nucleating agents. The phase change cold storage material provided by the invention has double phase change points; the temperature can be controlled between the double phase change point temperatures in the material distribution process; the freezing and cold storage effect is achieved; the proper unfreezing effect can also be achieved; in addition, the material has high phrase change latent heat enthalpy value (greater than 220kJ / kg); the more efficient and faster temperature reduction effect is achieved; in addition, the temperature can be permanently maintained in a specific temperature range.

Description

technical field

[0001] The invention relates to the technical field of phase change materials, in particular to a phase change cold storage material with double phase change points and a preparation method. Background technique

[0002] With the rapid development of China's economy, people's pace of life has increased, their quality of life has increased, and their requirements for the taste of food have gradually increased. Therefore, there are high-quality requirements for food preservation, especially in the process of cold chain logistics. The same chemical and pharmaceutical cold chain logistics fields also have a strong demand for low temperature ranges. In the existing cold chain system, related phase change materials have emerged one after another, and many research institutions and enterprises have carried out a lot of research and development work.

[0003] In today’s market, there is a relatively short supply of phase change materials at 0-15°C. Refrigerators are...

Examples

Embodiment 1

[0024] A phase change thermal storage material with multiple phase transition points, prepared using the following quality material-level steps: 30g xylitol, 20g potassium chloride, 43g deionized water, 1.8g spar, 3g carboxymethyl cellulose, borax 2.2g. First, dissolve sodium chloride in deionized water to form a sodium chloride salt solution, then add xylitol, stir quickly until completely dissolved, then add Span and carboxymethyl cellulose, and stir rapidly at a stirring speed of 800r / min To a viscous state, finally add borax, stir for 1 hour and then take a sample to measure DSC.

[0025] Use differential calorimetry scanner (DSC) to test its phase transition temperature, get as follows figure 1 A phase change material with two phase change temperature points, the peak temperatures of the two phase change temperature points are 13°C and -10°C respectively, and the overall latent heat of phase change is 225kJ / kg, which can be effectively applied to the whole process of foo...

Embodiment 2

[0027] A phase change thermal storage material with multiple phase transition points is prepared using the following high-quality material-level steps: 28 g of sorbitol, 67 g of deionized water, 0.8 g of fatty alcohol polyoxyethylene ether, 2 g of gelatin, and 2.2 g of copper sulfide. First, add sorbitol into deionized water and stir quickly to melt completely to form an organic solution, then add fatty alcohol polyoxyethylene ether and gelatin, stir quickly at a stirring speed of 800r / min until viscous, finally add copper sulfide, and stir for 1 hour Afterwards, samples were taken to determine DSC.

[0028] Use the differential calorimetry scanner (DSC) to test its phase transition temperature, and obtain a phase change material with two phase transition temperature points. The peak temperatures of the two phase transition temperature points are 10°C and -1°C respectively. The overall phase transition The latent heat is 230kJ / kg, which can effectively control the temperature ...

Embodiment 3

[0030] A phase change thermal storage material with multiple phase transition points, prepared using the following quality material-level steps: erythritol 40g, sodium chloride 20g, deionized water 35g, sodium lauryl sulfate 1.2g, fumed silica 2g , calcium oxide 1.8g. First, dissolve 20g of potassium chloride in deionized water to form a potassium chloride salt solution, then add erythritol, stir rapidly until it is completely dissolved, then add fumed silica and sodium lauric acid sulfate, at 800r / min Stir rapidly at the stirring speed until it becomes viscous, finally add calcium oxide, and take a sample to measure DSC after stirring for 1 hour.

[0031] Use the differential calorimetry scanner (DSC) to test its phase transition temperature, and obtain a phase change material with two phase transition temperature points. The peak temperatures of the two phase transition temperature points are 20°C and -20°C respectively. The overall phase transition The latent heat is 230kJ...

technical field

[0001] The invention relates to the technical field of phase change materials, in particular to a phase change cold storage material with double phase change points and a preparation method. Background technique

[0002] With the rapid development of China's economy, people's pace of life has increased, their quality of life has increased, and their requirements for the taste of food have gradually increased. Therefore, there are high-quality requirements for food preservation, especially in the process of cold chain logistics. The same chemical and pharmaceutical cold chain logistics fields also have a strong demand for low temperature ranges. In the existing cold chain system, related phase change materials have emerged one after another, and many research institutions and enterprises have carried out a lot of research and development work.

[0003] In today’s market, there is a relatively short supply of phase change materials at 0-15°C. Refrigerators are...

Examples

Embodiment 1

[0024] A phase change thermal storage material with multiple phase transition points, prepared using the following quality material-level steps: 30g xylitol, 20g potassium chloride, 43g deionized water, 1.8g spar, 3g carboxymethyl cellulose, borax 2.2g. First, dissolve sodium chloride in deionized water to form a sodium chloride salt solution, then add xylitol, stir quickly until completely dissolved, then add Span and carboxymethyl cellulose, and stir rapidly at a stirring speed of 800r / min To a viscous state, finally add borax, stir for 1 hour and then take a sample to measure DSC.

[0025] Use differential calorimetry scanner (DSC) to test its phase transition temperature, get as follows figure 1 A phase change material with two phase change temperature points, the peak temperatures of the two phase change temperature points are 13°C and -10°C respectively, and the overall latent heat of phase change is 225kJ / kg, which can be effectively applied to the whole process of foo...

Embodiment 2

[0027] A phase change thermal storage material with multiple phase transition points is prepared using the following high-quality material-level steps: 28 g of sorbitol, 67 g of deionized water, 0.8 g of fatty alcohol polyoxyethylene ether, 2 g of gelatin, and 2.2 g of copper sulfide. First, add sorbitol into deionized water and stir quickly to melt completely to form an organic solution, then add fatty alcohol polyoxyethylene ether and gelatin, stir quickly at a stirring speed of 800r / min until viscous, finally add copper sulfide, and stir for 1 hour Afterwards, samples were taken to determine DSC.

[0028] Use the differential calorimetry scanner (DSC) to test its phase transition temperature, and obtain a phase change material with two phase transition temperature points. The peak temperatures of the two phase transition temperature points are 10°C and -1°C respectively. The overall phase transition The latent heat is 230kJ / kg, which can effectively control the temperature ...

Embodiment 3

[0030] A phase change thermal storage material with multiple phase transition points, prepared using the following quality material-level steps: erythritol 40g, sodium chloride 20g, deionized water 35g, sodium lauryl sulfate 1.2g, fumed silica 2g , calcium oxide 1.8g. First, dissolve 20g of potassium chloride in deionized water to form a potassium chloride salt solution, then add erythritol, stir rapidly until it is completely dissolved, then add fumed silica and sodium lauric acid sulfate, at 800r / min Stir rapidly at the stirring speed until it becomes viscous, finally add calcium oxide, and take a sample to measure DSC after stirring for 1 hour.

[0031] Use the differential calorimetry scanner (DSC) to test its phase transition temperature, and obtain a phase change material with two phase transition temperature points. The peak temperatures of the two phase transition temperature points are 20°C and -20°C respectively. The overall phase transition The latent heat is 230kJ...

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