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A kind of preparation method of metal silver shell composite phase change capsule with high thermal conductivity

A composite phase transition and metallic silver technology, which is applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of thermal conductivity restriction, reduced heat storage performance, limited strengthening effect, etc.

Active Publication Date: 2020-07-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Metallic silver has a high thermal conductivity. Therefore, the current research uses metallic silver particles as a thermal conductivity agent to dope the traditional phase-change microcapsule shell material to enhance thermal conductivity. Although this method can improve the thermal conductivity of the composite phase to a certain extent. However, the thermal conductivity of the composite phase change microcapsules is still restricted by the thermal conductivity of the shell material and the content of the nano-silver particles. The strengthening effect is very limited, and if the nano silver particles are not fully combined with the phase change material, the prepared composite phase change capsule will reduce the heat storage performance to a certain extent

Method used

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  • A kind of preparation method of metal silver shell composite phase change capsule with high thermal conductivity
  • A kind of preparation method of metal silver shell composite phase change capsule with high thermal conductivity
  • A kind of preparation method of metal silver shell composite phase change capsule with high thermal conductivity

Examples

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Embodiment 1

[0031] A method for preparing metal silver shell composite phase-change capsules using lauric acid as a phase-change material, comprising the following steps:

[0032] (1) Preparation of lauric acid emulsion

[0033] (1-1) Select a lauric acid phase change material with a phase transition temperature of 44°C;

[0034] (1-2) choose cetyltrimethylammonium bromide as surfactant;

[0035] (1-3) Add 4g of lauric acid and 0.04g of surfactant to 100ml of deionized water, heat in a water bath at 60°C until the lauric acid melts, and then stir at 800r / min for 1 hour to form a lauric acid emulsion;

[0036] (2) Preparation of phase change emulsion containing silver bromide

[0037] (2-1) Potassium bromide solution with a concentration of 10ml of 100mMol / L and silver nitrate solution of 90mMol / L with a concentration of 10ml are successively poured into the lauric acid emulsion prepared in step (1). Stir at high speed for 30 minutes;

[0038] (2-2) Stop heating and reduce the stirring...

Embodiment 2

[0047] A preparation method for preparing metal-silver shell composite phase-change capsules using palmitic acid as a phase-change material comprises the following steps:

[0048] (1) Preparation of palmitic acid emulsion

[0049] (1-1) Select a palmitic acid phase change material with a phase transition temperature of 63°C;

[0050] (1-2) choose cetyltrimethylammonium bromide as surfactant;

[0051] (1-3) Add 4g of palmitic acid and 0.04g of surfactant to 100ml of deionized water, heat in a 75°C water bath until the palmitic acid melts, and then stir at 800r / min for 1 hour to form a palmitic acid emulsion;

[0052] (2) Preparation of phase change emulsion containing silver bromide

[0053] (2-1) Pour 10ml of potassium bromide solution with a concentration of 100mMol / L and 10ml of silver nitrate solution with a concentration of 90mMol / L into the palmitic acid emulsion prepared in step (1), and continue to process at 600r / min at 60°C Stir at high speed for 20 minutes;

[00...

Embodiment 3

[0062] A preparation method for preparing metal-silver shell composite phase-change capsules using stearic acid as a phase-change material comprises the following steps:

[0063] (1) preparation of stearic acid emulsion

[0064] (1-1) Selecting a stearic acid phase change material with a phase transition temperature of 68°C;

[0065] (1-2) choose cetyltrimethylammonium bromide as surfactant;

[0066] (1-3) Add 4g of stearic acid and 0.04g of surfactant to 100ml of deionized water, put it in a 75°C water bath and heat until the stearic acid melts, then stir at 800r / min for 1 hour to form stearic acid Lotion;

[0067] (2) Preparation of phase change emulsion containing silver bromide particles

[0068] (2-1) Pour 10ml of potassium bromide solution with a concentration of 100mMol / L and 10ml of silver nitrate solution with a concentration of 90mMol / L into the stearic acid emulsion prepared in step (1), and continue at 75°C at 700r / min Stirring at a speed of 10min;

[0069] (2...

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Abstract

The invention discloses a method for preparing a metallic silver composite phase-change capsule with high heat conductivity. By adopting the method, a dense metallic silver shell can be directly grownon the surface of a phase-change core, metallic silver has a very high heat conductivity coefficient (429W*m<-1>K<-1>), with the material as a shell material, the composite phase-change capsule has excellent temperature response, meanwhile, silver particles can be effectively supported and sufficiently combined with a phase-change material, and good heat storage performance can be maintained. Themetallic silver composite phase-change capsule prepared by using the method is capable of meeting application requirements of the phase-change material in the field of high heat conductivity.

Description

technical field [0001] The invention relates to the technical field of composite phase change materials, in particular to a method for preparing a metal silver shell composite phase change capsule with high thermal conductivity. Background technique [0002] With the rapid development of modern technology and industry, mankind is facing an unprecedented energy crisis. Finding new clean energy and improving energy utilization are the main ways to deal with the current crisis. Phase change energy storage materials can store and release heat during the phase transition process, so this energy storage technology can greatly improve energy utilization efficiency in the process of energy use, achieve the purpose of energy saving and environmental protection, and can be used in building energy saving and waste heat recovery. And functional thermal fluids and other fields have a wide range of applications. [0003] The current research on phase change materials mainly focuses on ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 白皓袁换美
Owner UNIV OF SCI & TECH BEIJING
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