Low temperature phase change cool storage agent and preparation method thereof

A low-temperature phase transition and cooling agent technology, applied in the field of energy storage, can solve the problems of inability to achieve low temperature, high phase transition temperature, and inability to popularize, and achieve the effects of easy production, low phase transition temperature, and no latent heat value decay.

Active Publication Date: 2013-02-27
SHANGHAI CHUANGSHI MEDICAL TECH (GRP) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic cold storage agents generally have defects such as high phase transition temperature and low latent heat value. CN101921578 discloses a cold storage agent, which is composed of polymers and water, and its phase transition temperature is 0°C, which cannot reach low temperatures; the patent number is CN90109434. The cold storage agent of X is composed of potassium chloride and water, which has a high decay rate due to phase separation; foreign low-temperature cold storage agents are expensive and cannot be popularized

Method used

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  • Low temperature phase change cool storage agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 19kg of ammonium chloride, 400g of dipotassium hydrogen phosphate, and 100g of nano-titanium dioxide (with a particle size of 20nm) into 80kg of deionized water, heat it to 70°C in a stainless steel heating furnace, and stir it evenly after melting. Slowly add 500 g of sodium hydroxyethyl cellulose with a viscosity of 40,000 s under stirring, and stir while adding until the sodium hydroxyethyl cellulose is uniformly dispersed, stir for 4 hours, and cool to 25°C to obtain the product. Take 200g of low-temperature phase-change cool storage agent and pretreat it at -30°C for 12 hours, and compare the temperature rise curve at room temperature of 27°C as shown in figure 1 shown by figure 1 It can be seen that the phase transition temperature of the cold storage agent prepared in this way is -15.2°C, and the latent heat value is 300KJ / Kg.

Embodiment 2

[0027] Add 13kg of ammonium chloride, 1kg of dipotassium hydrogen phosphate, and 75g of nano-titanium dioxide (with a particle size of 30nm) into 85.1kg of deionized water, heat it to 75°C in a stainless steel heating furnace, and stir it evenly after melting. Slowly add 750g of sodium hydroxyethyl cellulose with a viscosity of 30,000s under high-speed stirring, and stir while adding until the sodium hydroxyethyl cellulose is uniformly dispersed, stir for 3 hours, and cool to 25°C to obtain the product. Take 200g of low-temperature phase-change cool storage agent and pretreat it at -30°C for 12 hours, and compare the temperature rise curve at room temperature of 27°C as shown in figure 1 shown by figure 1 It can be seen that the phase transition temperature of the cold storage agent prepared in this way is -15.5°C, and its latent heat value is 321KJ / Kg.

Embodiment 3

[0029] Add 19.5kg of ammonium chloride, 2kg of dipotassium hydrogen phosphate, and 80g of nano-titanium dioxide (with a particle size of 50nm) into 77.42kg of deionized water, heat it to 70°C in a stainless steel heating furnace, and stir it evenly after melting. Slowly add 1 kg of sodium hydroxyethyl cellulose with a viscosity of 20,000 s under high-speed stirring at 4000 rpm, and stir while adding until the sodium hydroxyethyl cellulose is uniformly dispersed, stir for 4 hours, and cool to 25°C to obtain the product. Take 200g of low-temperature phase-change cool storage agent and pretreat it at -30°C for 12 hours, and compare the temperature rise curve at room temperature of 27°C as shown in figure 1 shown by figure 1 It can be seen that the phase transition temperature of the cold storage agent prepared in this way is -15.5°C, and its latent heat value is 318KJ / Kg.

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Abstract

The invention discloses a low temperature phase change cool storage agent and a preparation method thereof. The low temperature phase change cool storage agent comprises, by mass, 8% to 19.5% of ammonium chloride, 0.1% to 2% of dipotassium phosphate, 0.1% to 1% of sodium hydroxyethyl cellulose, 0.05% to 0.1% of nano-titanium dioxide and the balance deionized water. The preparation method includes adding the ammonium chloride, the dipotassium phosphate and the nano-titanium dioxide in the deionized water, uniformly mixing to obtain a solution, heating the solution to 70 DEG C to 80 DEG C, then slowly adding the sodium hydroxyethyl cellulose in the solution under high speed stirring, and uniformly stirring to obtain the low temperature phase change cool storage agent. Compared with low temperature phase change cool storage agents and preparation methods in prior art, the low temperature phase change cool storage agent and the preparation method thereof have the advantages that the low temperature phase change cool storage agent is low in phase transition temperature, free of salt crystal separation, high in phase change potential heat value, free of potential heat value decay after overturn circulation and the like, raw materials are easy to obtain, the production is easy, the low temperature phase change cool storage agent is safe and non-toxic, and the low temperature phase change cool storage agent has a potential application value in food fresh keeping and biological vaccine cold chain transportation.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a low-temperature phase-change cold storage agent and a preparation method thereof. Background technique [0002] With the development of the economy and the improvement of people's living standards, the quality requirements for fresh fruits and vegetables and biological products in off-site refrigerated transportation are getting higher and higher. The core technology of cold storage transportation. Domestic cold storage agents generally have defects such as high phase transition temperature and low latent heat value. CN101921578 discloses a cold storage agent, which is composed of polymers and water, and its phase transition temperature is 0°C, which cannot reach low temperatures; the patent number is CN90109434. The cold storage agent of X is composed of potassium chloride and water, which has a high decay rate due to phase separation; foreign low-temperature cold stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCY02E60/147Y02E60/14
Inventor 范立涛居易杜海兵
Owner SHANGHAI CHUANGSHI MEDICAL TECH (GRP) CO LTD
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