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Low-temperature gel-state phase-changing cold storage agent and preparation method thereof

A phase-change cooling storage agent and low-temperature gel technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of environmental pollution, poor degradability of cooling storage agents, etc., and achieve low production cost, avoid thermal damage, and latent heat. big effect

Inactive Publication Date: 2016-05-25
SHENZHEN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many of them are traditional acrylic type. This kind of cold storage agent has poor degradability, and it is easy to cause serious environmental pollution after being used in large quantities.

Method used

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  • Low-temperature gel-state phase-changing cold storage agent and preparation method thereof
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  • Low-temperature gel-state phase-changing cold storage agent and preparation method thereof

Examples

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preparation example Construction

[0028] A preparation method of a low-temperature gel state phase-change cold storage agent, the specific steps are as follows;

[0029] (1) Add 4-5 parts of konjac glucomannan to 100 parts of water, stir for 30 minutes to fully swell;

[0030] (2) Add potassium persulfate (0.1-0.2 parts) to the swollen konjac glucomannan as an initiator, and add 12-20 parts of acrylic acid (neutralized with 60% sodium hydroxide) and acrylamide 16 after a few minutes -20 parts, while adding N,N-methylenebisacrylamide (0.01-0.05 parts) as a crosslinking agent.

[0031] (3) Uniform mechanical stirring and at the same time, the temperature is raised to 55-65°C by means of temperature programming, and the reaction time is 2-3H;

[0032] (4) The mixture is washed, dried and pulverized to obtain a powder for use.

[0033] (5) Mix the prepared powder with ammonium chloride and potassium nitrate powder, add an appropriate amount of water, and stir evenly to prepare a transparent gel-state phase-chang...

Embodiment 1

[0035] (1) Add 5 parts of konjac glucomannan to 100 parts of water, stir for 30 minutes to make it fully swell;

[0036] (2) Add potassium persulfate (0.16 parts) to the swollen konjac glucomannan as an initiator, add 20 parts of acrylic acid (neutralized with 60% sodium hydroxide) and 20 parts of acrylamide after a few minutes, and add N,N-methylenebisacrylamide (0.03 parts);

[0037] (3) Uniform mechanical stirring and at the same time, the temperature is raised to 60°C by means of a temperature program, and the reaction time is 3H;

[0038] (4) The mixture is washed, dried and pulverized to obtain a powder for use.

[0039] (5) In terms of mass fraction, take 10% powder, 15% ammonium chloride and 7% potassium nitrate and mix the rest with water, and stir evenly to prepare a cold storage agent with a phase transition temperature of -18°C.

[0040] Test of cooling agent performance: DSC detection and step cooling curve test for the prepared cooling agent (such as figure 1 ...

Embodiment 2

[0042] (1) Add 5 parts of konjac glucomannan to 100 parts of water, stir for 30 minutes to make it fully swell;

[0043] (2) Add potassium persulfate (0.16 parts) to the swollen konjac glucomannan as an initiator, add 20 parts of acrylic acid (neutralized with 60% sodium hydroxide) and 20 parts of acrylamide after a few minutes, and add N,N-methylenebisacrylamide (0.03 parts);

[0044] (3) Uniform mechanical stirring and at the same time, the temperature is raised to 60°C by means of a temperature program, and the reaction time is 3H;

[0045] (4) The mixture is washed, dried and pulverized to obtain a powder for use.

[0046] (5) In terms of mass fraction, take 10% powder, 15% ammonium chloride and the rest as water, mix them with water, and stir evenly to prepare a cool storage agent with a phase transition temperature of -15°C.

[0047] Test of cooling agent performance: DSC detection and step cooling curve test for the prepared cooling agent (such as Figure 4 , 5 , 6)...

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Abstract

The invention provides a low-temperature gel-state phase-changing cold storage agent which comprises a konjac glucomannan-crylic acid-acrylamide grafted copolymer and a phase-changing cold storage material. The invention also provides a preparation method of the low-temperature gel-state phase-changing cold storage agent. The preparation method provided by the invention has the beneficial effects that the manufacturing cost is low, and the prepared cold storage agent is high in latent heat, long in cold storage time, non-toxic and odorless, and environmentally friendly.

Description

technical field [0001] The invention relates to a cold storage agent, in particular to a low-temperature gel phase-change cold storage agent and a preparation method thereof. Background technique [0002] With the improvement of living standards of urban and rural residents and changes in consumption habits, people's requirements for product quality, loss, pollution, price and sales period are also increasing, and the demand for pre-cooling and refrigerated transportation in the production area is expanding. Therefore, water The development of the cold chain logistics industry represented by agricultural products, livestock products, fruits and vegetables, flowers and medicines has become particularly important. The cooling agent plays an important role in the cold chain transportation of products, which greatly reduces the thermal damage of products during storage and transportation. [0003] Cold storage materials are the key to cold storage technology. Water is the most ...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F222/38C08L51/02C08K3/28C09K5/06
CPCC08F251/00C08K3/28C09K5/066C08F220/06C08F220/56C08F222/385C08L51/02Y02E60/14
Inventor 王冬梅
Owner SHENZHEN POLYTECHNIC
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