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Phase change cold storage material for freshness retaining of partial-frozen chilled food and preparation method

A technology of phase change cold storage and food preservation, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of reducing the latent heat value and loss of phase change, achieve excellent phase change heat storage performance, simple equipment, easy to reduce The cost effect of mass production

Inactive Publication Date: 2019-07-12
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there have been related researches on adding additives to improve the thermal conductivity, but the results will greatly reduce the value of the latent heat of phase change, and make up for other deficiencies by losing a part of the latent heat of phase change

Method used

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  • Phase change cold storage material for freshness retaining of partial-frozen chilled food and preparation method
  • Phase change cold storage material for freshness retaining of partial-frozen chilled food and preparation method
  • Phase change cold storage material for freshness retaining of partial-frozen chilled food and preparation method

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Embodiment 1

[0059] According to theoretical calculation, the minimum eutectic point ratio of decanoic acid and dodecanol is 0.762:0238. In order to verify the accuracy of the theoretical value, the molar mass ratios of 74:26, 75:25, 75:25, and 76:24, 77:23, 78:22 decanol-dodecanol composite phase change materials were verified experimentally. A certain mass of experimental samples was weighed with a precision electronic balance, and the mass of each group of samples was 50 g, which were placed in a beaker with a volume of 100 mL. Put the beaker containing the decyl alcohol-dodecanol mixed solution on a magnetic stirrer, stir for 20mins at a heating temperature of 35°C and a speed of 300r / min to ensure that the two are evenly mixed, and then cool the mixture naturally to room temperature to obtain decano Binary phase transition system of alcohol-dodecanol. From Figure 4 It can be seen from the step cooling curve that the freezing point temperature is the lowest when the mass fraction ra...

Embodiment 2

[0061] Weigh 30g of DA-LA with a mass ratio of 76:24 as the base liquid, and then successively weigh 0.002 parts, 0.004 parts, 0.006 parts, 0.008 parts, and 0.01 parts of hydroxylated multi-walled carbon nanotubes and add them to decanol / dodecanol solution. Ultrasonic dispersion is carried out on the prepared materials. Set the parameters of the ultrasonic disperser, the ultrasonic device oscillates 360 times, a cycle of ultrasonic work for 5 seconds, pause for 5 seconds, the upper temperature limit is set to 45 °C, and the ultrasonic power is 300W. Take out the homogeneously dispersed material by ultrasonic and let it stand at room temperature for later use. The prepared nanocomposite phase change material was left standing at room temperature for 48 hours, and its sedimentation phenomenon was observed. It was found that the five groups of solutions were evenly dispersed and no significant sedimentation occurred. When the nanomaterials are added to a certain mass fraction...

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Abstract

The invention provides a phase change cold storage material for freshness retaining of partial-frozen chilled food and a preparation method. The phase change cold storage material for partial-frozen fruits and vegetables uses a mixed solution of decyl alcohol and dodecyl alcohol as main base liquid and uses hydroxylated multi-wall carbon nanotubes and sodium dodecylbenzenesulfonate as additives toimprove the thermal conductivity of the phase change cold storage material. The phase change temperature of the phase change cold storage material is -3.2 DEG C; and the latent heat of phase change is 171 J / g and the thermal conductivity is 0.3462 W / (m.K). After low and high temperatures are circulated for 100 times, the composite phase change cold storage material still has excellent thermal stability. The obtained phase change cold storage material can be applied to freshness retaining of foods such as meat and vegetables. The invention further provides a preparation method of a composite phase change cold storage material.

Description

[0001] Technical field: [0002] The invention relates to a phase-change cold storage material for slightly frozen and refrigerated food preservation, in particular to a phase-change cold storage material suitable for providing cold storage and freshness for meat, vegetables and other foods. [0003] Background technique: [0004] In recent years, with the rapid development of economy, energy shortage and environmental problems have become increasingly serious. Therefore, improving energy utilization efficiency and protecting the environment is an important issue. Energy storage is a key technology to solve the crisis. Storing energy from renewable sources such as solar and wind, especially when generated off-peak, is critical to the widespread adoption of renewable energy technologies. TES (Thermal Energy Storage) is one of the effective methods to solve the contradiction between the supply and demand of energy in space and time. This technology is considered as a potential...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/066Y02E60/14
Inventor 赵祎章学来纪珺徐笑锋张时华张宇迪王迎辉刘璐郑钦月刘彪
Owner SHANGHAI MARITIME UNIVERSITY
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