A jelly-like gel-type composite low-temperature phase-change cold storage material and its preparation method

A technology of low-temperature phase change and cold storage materials, applied in the field of phase change materials, can solve the problem of low temperature phase change cold storage materials, etc., achieve low phase change temperature, stable phase change process, and prevent leakage

Active Publication Date: 2020-06-23
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, there are relatively few studies on low-temperature phase-change cool storage agents, especially the phase-change temperature between -60°C and 0°C.

Method used

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  • A jelly-like gel-type composite low-temperature phase-change cold storage material and its preparation method
  • A jelly-like gel-type composite low-temperature phase-change cold storage material and its preparation method
  • A jelly-like gel-type composite low-temperature phase-change cold storage material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] At room temperature, when configuring, add distilled water with a mass fraction of 66% to the beaker, stir with a magnetic stirrer, and add 22% sodium formate and 12% potassium chloride in sequence during the stirring process; during the process of adding materials, after the sodium formate is completely dissolved Then add potassium chloride, continue to stir until the potassium chloride is completely dissolved and become a transparent solution, and place it at room temperature.

[0029] Through the NETZSCH DSC 200F3 instrument test, the DSC test curve is as follows figure 1 , the phase change temperature of the phase change cold storage material is -23.5°C, and the latent heat of phase change is 223.4J / g. Such as image 3 As shown by the T-t curve of the phase change cold storage material, the chemical properties of the phase change material are stable, and the phase change process is stable, but there is a large degree of supercooling. The cold storage process and c...

Embodiment 2

[0031] At room temperature, when configuring, add distilled water with a mass fraction of 65.6% to the beaker, stir with a magnetic stirrer, and add 22% sodium formate and 12% potassium chloride in turn during the stirring process; during the process of adding materials, after the sodium formate is completely dissolved Then add potassium chloride and continue to stir until the potassium chloride is completely dissolved and becomes a transparent solution. Then in the stirring process, adding mass fraction in batches is 0.4% xanthan gum, stirring until xanthan gum is completely dissolved in the solution and becomes a uniformly mixed state, the solution is a milky yellow solution, and after standing for 6 hours, the obtained Milky yellow transparent jelly-like gel cooling agent.

[0032] Through the NETZSCH DSC 200F3 instrument test, the DSC test curve is as follows image 3 , the phase change temperature of the phase change cold storage material is -23.8°C, and the latent heat ...

Embodiment 3

[0034] At room temperature, when configuring, weigh 22% sodium formate, 12% potassium chloride, 65.35% distilled water, 0.4% xanthan gum, 0.13% sodium lauryl sulfate, and 0.12% titanium dioxide according to the required mass ratio. Put the weighed sodium lauryl sulfate in the beaker, add the weighed distilled water to it, stir with a magnetic stirrer, add sodium formate, potassium chloride, and nano-titanium dioxide in sequence during the stirring process, when adding materials The operation requires one material to be completely dissolved before adding the next material, and continue to stir until all the materials are fully mixed and distributed evenly, then ultrasonically vibrate for 60 minutes; then add the weighed yellow powder in batches during the stirring process. Raw gum (the first batch of xanthan gum is added, after stirring until the xanthan gum is completely uniformly dissolved, then add the second batch), stir until the solution becomes a white gel-like liquid mix...

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Abstract

The invention provides a jelly-like gel type composite low-temperature phase-change cold storage material. The jelly-like gel type composite low-temperature phase-change cold storage material is prepared from the following components in percentage by mass: 22 to 23 percent of sodium formate, 12 percent of potassium chloride, 0.4 percent of xanthan gum, 0.12 percent of nanometer titanium dioxide, 0.13 percent of lauryl sodium sulfate and the balance of distilled water. The invention also provides a preparation method of the low-temperature phase-change cold storage material. The phase change temperature of the material is -23.5 to -23.8 DEG C, and the latent heat is 220.7 to 235.7J / g. The jelly-like gel type composite low-temperature phase-change cold storage material is reversible in a phase change process, is in the form of jelly-like gel at room temperature, and can be prevented from leaking; required raw materials are stable in chemical properties, can be used for a long time, and are non-toxic, harmless, wide in sources and lower in cost, so that the cold storage material can be widely applied to the low temperature field.

Description

technical field [0001] The invention belongs to the field of phase change materials, and relates to a multi-component composite gel cold storage agent, specifically a jelly-like gel-type composite low-temperature phase change cold storage material and a preparation method thereof. Background technique [0002] The limited energy reserves can no longer meet the rapidly growing energy demand of human beings, and the use of traditional fossil energy generally produces greenhouse gases such as carbon dioxide that lead to global climate change, which makes cold storage technology get attention and development. Cold storage technology is to use materials to release sensible heat and latent heat in the process of phase change to accumulate cold energy into the storage medium, and then release it when needed. It can overcome the problem of space-time matching error in the process of energy utilization and effectively save energy. new energy-saving technology. [0003] The cold stor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/066Y02E60/14
Inventor 陆威王昊
Owner UNIV OF SHANGHAI FOR SCI & TECH
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