High-thermal-conductivity phase change microcapsule as well as preparation method and application thereof

A technology of phase change microcapsules and high thermal conductivity, which is applied in the direction of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc. It can solve the problems of poor sensitivity to environmental temperature changes, increased risk of core material leakage, and easy aging. Achieving the effects of sensitivity to environmental temperature changes, dense shell material, and low risk

Pending Publication Date: 2022-04-12
CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because conventional phase change microcapsules often use polymers with poor thermal conductivity as the shell material, the sensitivity of phase change microcapsules to environmental temperature changes is poor when realizing the temperature control function.
In addition, polymer shell materials are prone to aging in environments with frequent temperature changes, increasing the risk of core material leakage

Method used

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  • High-thermal-conductivity phase change microcapsule as well as preparation method and application thereof
  • High-thermal-conductivity phase change microcapsule as well as preparation method and application thereof
  • High-thermal-conductivity phase change microcapsule as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Dissolve 0.44g of palmitic acid and 0.8g of aluminum chloride hexahydrate in 200mL of ethanol aqueous solution (the ethanol concentration is 200g / L), then add 5g of graphene, and stir while heating in a water bath (75°C; 300r / min) to obtain a lipophilic modified graphene suspension, filter the lipophilic modified graphene suspension, and dry the filter residue to obtain lipophilic modified graphene powder.

[0057] (2) Mix n-tetradecane and n-hexadecane at a weight ratio of 1:1 until the mixture is completely miscible, and stand without delamination to obtain a core material liquid.

[0058] Dissolve 0.4 g of benzoyl peroxide powder in 20 g of methyl methacrylate (in liquid state), stir to dissolve it completely, and prepare a shell material solution.

[0059] Dissolve 1 g of polyvinyl alcohol powder in 100 mL of deionized water (water bath temperature is 90°C) to obtain a surfactant solution, and pour the surfactant solution into a three-necked flask, which is plac...

Embodiment 2

[0064] (1) Dissolve 0.44g of palmitic acid and 0.8g of aluminum chloride hexahydrate in 200mL of ethanol aqueous solution (the ethanol concentration is 200g / L), then add 5g of graphene, and stir while heating in a water bath (75°C; 300r / min), The lipophilic modified graphene suspension is obtained, the lipophilic modified graphene suspension is filtered, and the filter residue is dried to obtain lipophilic modified graphene powder.

[0065] (2) Mix n-tetradecane and n-hexadecane at a weight ratio of 1:3 until the mixture is completely miscible, and stand without delamination to obtain a core material liquid.

[0066] Weigh 0.2 g of benzoyl peroxide powder and dissolve it in 20 g of methyl methacrylate (in liquid state), stir to make it completely dissolve, and prepare a shell material solution.

[0067] Weigh 1g of polyvinyl alcohol powder and dissolve it in 100mL of deionized water (water bath temperature 90°C) to obtain a surfactant solution, and pour the surfactant solution...

Embodiment 3

[0072] (1) Dissolve 0.44g of palmitic acid and 0.8g of aluminum chloride hexahydrate in 200mL of ethanol aqueous solution (the ethanol concentration is 200g / L), then add 5g of graphene, and stir while heating in a water bath (75°C; 300r / min) to obtain a lipophilic modified graphene suspension, filter the lipophilic modified graphene suspension, and dry the filter residue to obtain lipophilic modified graphene powder.

[0073] (2) Mix n-tetradecane and n-hexadecane at a weight ratio of 1:1 until the mixture is completely miscible, and stand without delamination to obtain a core material liquid.

[0074] Dissolve 0.4 g of benzoyl peroxide powder in 20 g of methyl methacrylate (in liquid state), stir to dissolve it completely, and prepare a shell material solution.

[0075] Dissolve 1 g of polyvinyl alcohol powder in 100 mL of deionized water (water bath temperature is 90°C) to obtain a surfactant solution, and pour the surfactant solution into a three-necked flask, which is plac...

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Abstract

The invention discloses a high-thermal-conductivity phase change microcapsule and a preparation method and application thereof.The high-thermal-conductivity phase change microcapsule comprises a shell layer and a phase change core material, the shell layer is composed of polymethyl methacrylate and oleophylic modified graphene, and the oleophylic modified graphene accounts for 2-8 wt% of the weight of the shell layer. According to the method, aluminum chloride is used as a catalyst, and graphene and C12-C18 carboxylic acid react in an alcohol-water solution at 70-80 DEG C, so that C12-C18 oleophylic groups are grafted to the surface of graphene, and the oleophylic modified graphene is obtained. The oleophylic modified graphene is added in the cross-linking process of methyl methacrylate, a phase change microcapsule shell layer with high thermal conductivity can be prepared, the shell layer is compact, and the risk of leakage of the phase change core material can be reduced.

Description

technical field [0001] The invention relates to the technical field of microcapsule preparation, in particular to a high-thermal-conductivity phase-change microcapsule for suppressing concrete temperature cracks, a preparation method and application thereof. Background technique [0002] The hydration and heat release of concrete can easily cause uneven heating inside and outside, resulting in a large number of temperature cracks. This phenomenon is more obvious in the process of pouring large-volume concrete for bridges, which seriously affects the health and safety of bridge structures. At present, conventional solutions include: increasing the water-binder ratio of concrete, adding alkali-activated slag cementitious materials, and pre-embedded water pipes, etc., but the above solutions have problems such as long concrete setting time, low early strength, and high economic costs. Therefore, how to effectively suppress the formation of temperature cracks at low cost and in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/02C04B24/00
Inventor 王亚洲杨国坤龙勇余文志刘开志李晨
Owner CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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