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Phase change heat storage composite material with flame retardance and flexibility as well as preparation method and application of phase change heat storage composite material

A technology of phase change heat storage and composite materials, which is applied in the field of phase change heat storage materials, can solve problems such as difficulty in meeting practical application requirements, failure to consider electrical insulation, lack of flexibility, etc., to achieve large-scale industrial application and good safety Protective effect, low production cost effect

Pending Publication Date: 2022-07-15
CIVIL AVIATION FLIGHT UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing phase-change heat storage materials still have many deficiencies in the application field of lithium-ion battery thermal management, such as: poor flame retardancy, no consideration of electrical insulation, no flexibility, etc., which are difficult to meet the needs of practical applications

Method used

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  • Phase change heat storage composite material with flame retardance and flexibility as well as preparation method and application of phase change heat storage composite material
  • Phase change heat storage composite material with flame retardance and flexibility as well as preparation method and application of phase change heat storage composite material
  • Phase change heat storage composite material with flame retardance and flexibility as well as preparation method and application of phase change heat storage composite material

Examples

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preparation example Construction

[0039] The flow chart of the preparation of phase change heat storage composites is as follows: figure 1 As shown, the specific preparation steps are as follows:

[0040] S1, the preparation of phase change microcapsules:

[0041]The paraffin wax was heated to 60°C to melt to a transparent liquid state, an aqueous solution of sodium dodecylbenzenesulfonate (mass fraction 1.4%) was added, and after mechanical stirring for 20 minutes, an oil-in-water paraffin wax emulsion was obtained. The aqueous solution of inorganic salt A (7% by mass) and the aqueous solution of inorganic salt B (8.5% by mass) were slowly added dropwise to the paraffin wax emulsion, respectively, and stirred for 3 hours. The reaction product is subjected to suction filtration and washing in sequence, and dried at 30 to 40° C. for 24 to 36 hours to obtain white powdery phase-change microcapsules.

[0042] S2. Preparation of flexible composite materials:

[0043] After the hydroxyl terminated polydimethylsi...

Embodiment 1

[0048] 20g of paraffin was placed in a 500ml three-necked flask, heated to 60°C and melted to a transparent liquid state, 50g of an aqueous solution of sodium dodecylbenzenesulfonate (mass fraction was 1.4%) was added, and after mechanical stirring for 20 minutes, a water-in-water solution was obtained. Oil-based paraffin emulsion. The aqueous solution of 80 grams of calcium chloride (mass fraction is 7%) and the aqueous solution of 80 grams of potassium carbonate (mass fraction of 8.5%) were slowly added dropwise to the paraffin emulsion, respectively, mechanically stirred for 3 hours (stirring speed was 300 rpm) / minute). The reaction product was subjected to suction filtration, washed twice with distilled water and petroleum ether in turn, and dried at 40° C. for 36 hours to obtain white powdery phase-change microcapsules. After mixing 52 grams of hydroxyl-terminated polydimethylsiloxane, 2.6 grams of ethyl orthosilicate, and 1.0 grams of dibutyltin dilaurate, 40 grams of ...

Embodiment 2

[0051] 20g of paraffin was placed in a 500ml three-necked flask, heated to 60°C and melted to a transparent liquid state, 50g of an aqueous solution of sodium dodecylbenzenesulfonate (mass fraction was 1.4%) was added, and after mechanical stirring for 20 minutes, a water-in-water solution was obtained. Oil-based paraffin emulsion. The aqueous solution of 80 grams of calcium chloride (mass fraction is 7%) and the aqueous solution of 80 grams of potassium carbonate (mass fraction of 8.5%) were slowly added dropwise to the paraffin emulsion, respectively, mechanically stirred for 3 hours (stirring speed was 300 rpm) / minute). The reaction product was suction filtered, washed twice with distilled water and petroleum ether in turn, and dried at 30° C. for 24 hours to obtain white powdery phase-change microcapsules. After mixing 42 grams of hydroxyl terminated polydimethylsiloxane, 2.1 grams of ethyl orthosilicate, and 0.8 grams of dibutyltin dilaurate, 50 grams of phase change mi...

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Abstract

The invention discloses a phase change heat storage composite material with flame retardance and flexibility as well as a preparation method and application of the phase change heat storage composite material. The phase change heat storage composite material is prepared from phase change microcapsules, flaky aluminum oxide powder, hydroxyl-terminated polydimethylsiloxane, tetraethoxysilane, dibutyltin dilaurate and the like. The preparation method comprises the following steps: firstly, preparing a phase change microcapsule which takes paraffin as a core material and an inorganic non-combustible material as a wall material by adopting a self-assembly method; the preparation method comprises the following steps: preparing phase change microcapsules, uniformly stirring and mixing the prepared phase change microcapsules with flaky alumina powder, hydroxyl-terminated polydimethylsiloxane, tetraethoxysilane, dibutyltin dilaurate and other components, transferring the mixture into a mold, carrying out compression molding, and curing the obtained product in a drying oven to prepare the phase change heat storage composite material. The phase change heat storage composite material provided by the invention has good flame-retardant and flexible characteristics, can be used for a lithium ion battery heat management system, is simple and convenient in preparation method and low in material cost, and has relatively great industrial application potential.

Description

technical field [0001] The invention relates to the technical field of phase-change heat storage materials, in particular to a phase-change heat storage composite material with both flame retardancy and flexibility, a preparation method and an application. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect and low self-discharge rate, and have been widely used in electric vehicles, energy storage systems, drones, electronic products and other fields. When the lithium-ion battery is under extreme working conditions such as extrusion, overcharge, overdischarge, and puncture, the heat generated by the electrochemical reaction inside the battery causes the battery temperature to rise continuously, and thermal runaway may occur. It is common that during the rapid charge and discharge process of lithium-ion batteries, the battery temperature will rise sharply along with a series of complex electrochemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L91/06C08K7/00C08K3/26C08K3/30C08K5/5415C09K5/06H01M10/653H01M10/6569
CPCC08L83/04C09K5/063H01M10/6569H01M10/653C08K2003/265C08K2003/3045C08L2201/02C08L2203/20C08L91/06C08K7/00C08K3/26C08K3/30C08K5/5415
Inventor 智茂永贺元骅余兴科刘全义雷秋鸣
Owner CIVIL AVIATION FLIGHT UNIV OF CHINA
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