Efficient environment-friendly low-temperature composite phase change cold accumulating agent, as well as preparation method and application thereof

A composite phase change and cold storage agent technology, which is applied in the fields of application, chemical instruments and methods, food preservation, etc., can solve the problems of less research on phase change cold storage agents, achieve large latent heat of phase change, simple preparation process, and supercooling degree small effect

Active Publication Date: 2015-06-24
南京久鼎环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the phase change temperature of the low-temperature phase change cool storage agent is mostly at 0~-10°C, and there are few studies on the phase change cool storage agent with lower phase change temperature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A high-efficiency and environment-friendly low-temperature composite phase-change cold storage agent is composed of the following components by mass percentage: 5% potassium chloride, 10% sodium chloride, 0.3% citric acid, 1.25% sodium tetraborate, 1% guar gum, water 82.45%.

[0021] The preparation method of high-efficiency and environment-friendly low-temperature composite phase-change cold storage agent comprises the following steps:

[0022] 1) According to the mass percentage, prepare potassium chloride 5g, sodium chloride 10g, guar gum 1g, citric acid 0.3g, sodium tetraborate 1.25g, water 82.45g;

[0023] 2) Mix potassium chloride, sodium chloride, guar gum, citric acid, and sodium tetraborate and grind them thoroughly to obtain a mixture;

[0024] 3) Add the mixture in step 2) to water, heat it in a water bath to keep its temperature at 55°C, turn on high-speed stirring, and stir for 90 minutes to fully dissolve and disperse the solid matter in the water;

[00...

Embodiment 2

[0028] In this embodiment, calculated by weight percentage, it includes 10% potassium chloride, 15% sodium chloride, 0.3% citric acid, 1.25% sodium tetraborate, 1% guar gum, and 72.45% water.

[0029] 1. Prepare 10g of potassium chloride, 15g of sodium chloride, 1g of guar gum, 0.3g of citric acid, 1.25g of sodium tetraborate, and 72.45g of water according to the mass percentage;

[0030] 2. Mix all the above solid substances and grind them thoroughly;

[0031] 3. Add the weighed water into the solid, heat it in a water bath to keep the temperature at 50°C, turn on the high-speed stirring, and stir for 120 minutes to fully dissolve and disperse the solid in the water.

[0032] 4. Turn off the stirring, and let the material obtained after stirring stand for 24 hours to obtain the cooling agent.

[0033] Experiments have proved that its phase transition temperature is -22.3°C, and its latent heat of phase transition is about 310kJ / kg.

Embodiment 3

[0035] In this embodiment, calculated by weight percentage, it includes 11% potassium chloride, 15% sodium chloride, 0.3% citric acid, 1.25% sodium tetraborate, 2% guar gum, and 71.45% water.

[0036] 1. Prepare 11g of potassium chloride, 15g of sodium chloride, 1g of guar gum, 0.3g of citric acid, 1.25g of sodium tetraborate, and 71.45g of water according to the mass percentage;

[0037] 2. Mix all the above solid substances and grind them thoroughly;

[0038] 3. Add the weighed water into the solid, heat in a water bath to keep the temperature at 60°C, turn on high-speed stirring, and stir for 110 minutes to fully dissolve and disperse the solid in the water.

[0039] 4. Turn off the stirring, and let the material obtained after stirring stand for 24 hours to obtain the cooling agent.

[0040] It has been proved by experiments that the phase transition temperature is -21.3°C and the latent heat of phase transition is about 315kJ / kg.

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Abstract

The invention discloses an efficient environment-friendly low-temperature composite phase change cold accumulating agent. The cold accumulating agent is prepared from the following components in percentage by mass: 5-11 percent of potassium chloride, 10-15 percent of sodium chloride, 0.1-0.6 percent of citric acid, 1-1.5 percent of sodium tetraborate, 0.5-2 percent of guar gum and 70-83.4 percent of water. The invention further discloses a method for preparing the efficient environment-friendly low-temperature composite phase change cold accumulating agent, and application of the efficient environment-friendly low-temperature composite phase change cold accumulating agent in the field of storage and fresh preservation. Compared with a traditional cold accumulating agent preparation process, the process has the characteristics of convenience and rapidness, the prepared cold accumulating agent is transparent or translucent gel, and has the characteristics of safety, no pollution, efficiency, large latent heat of phase change and small condensate depression. Experiments prove that the phase-change temperature is between minus 21 and minus 24 DEG C, and the latent heat of phase change is 280-320kJ/kg.

Description

technical field [0001] The invention relates to the field of preparation of cold storage agents, in particular to a high-efficiency and environment-friendly low-temperature composite phase-change cold storage agent and its preparation method and application. Background technique [0002] Cold storage technology is a technology that uses a series of effective means to store cold energy in the cold storage agent and release the cold energy when needed. Cold storage technology began in the 1970s. Since then, people have made a lot of explorations on cold storage technology, and the application range of cold storage technology has become more and more extensive. In cold storage technology, the choice of cold storage agent is very important. At present, the commonly used cold storage agent is a phase change cold storage agent, which absorbs or releases heat by phase change, and can be reused. [0003] According to the composition, the phase change cool storage agent can be divi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06A23L3/37
CPCA23L3/37C09K5/06Y02E60/14
Inventor 周荣辉赵东华刘飞云高海素
Owner 南京久鼎环境科技股份有限公司
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