A kind of double-layer phase-change microcapsule and its preparation method and its application

A phase-change microcapsule and double-layer technology, which is applied in the field of asphalt manufacturing, can solve the problems of volatilization of phase-change materials and easy rupture of single-layer microcapsules, and achieves enhanced high temperature stability, good mechanical properties and thermal stability, and reduced The effect of crack width

Active Publication Date: 2021-08-10
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a double-layer phase-change microcapsule and its preparation method and application, which can effectively solve the problem that the single-layer microcapsule is easily broken and cause the volatilization of the phase-change material, and better utilize the phase-change The temperature-regulating performance of the material can reduce the temperature-related diseases of the pavement

Method used

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  • A kind of double-layer phase-change microcapsule and its preparation method and its application
  • A kind of double-layer phase-change microcapsule and its preparation method and its application
  • A kind of double-layer phase-change microcapsule and its preparation method and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In terms of parts by mass, weigh 6 parts of single-layer phase change microcapsules, add 15 parts of pure water, and stir evenly.

[0029] Then heat the prepared solution to 70°C, add 0.8 parts of Tween 80, 0.6 parts of boric acid and 3 parts of zinc chloride solution, then drop in 5% sodium hydroxide solution to adjust the pH to 7, wait for 0.5 hours of heat preservation reaction, filter , washing and drying to obtain zinc borate double-layer phase change microcapsules.

Embodiment 2

[0031] In terms of parts by mass, 10 parts of single-layer phase change microcapsules were weighed, 22 parts of pure water were added, and stirred evenly.

[0032] Then heat the prepared solution to 75°C, add 1.2 parts of Tween 80, 1 part of boric acid and 3.4 parts of zinc chloride solution, then drop in 5% sodium hydroxide solution to adjust the pH to 8, wait for 0.5 hours of heat preservation reaction, filter , washing and drying to obtain zinc borate double-layer phase change microcapsules.

Embodiment 3

[0034] In terms of parts by mass, 14 parts of single-layer phase change microcapsules were weighed, 27 parts of pure water were added, and stirred evenly.

[0035] Then heat the prepared solution to 80°C, add 1.6 parts of Tween 80, 1.4 parts of boric acid and 4 parts of zinc chloride solution, then drop in 5% sodium hydroxide solution to adjust the pH to 8, wait for 0.5 hours of heat preservation reaction, filter , washing and drying to obtain zinc borate double-layer phase change microcapsules.

[0036] 2. Aluminum hydroxide double-layer phase change microcapsules

[0037] In terms of parts by mass, 6-14 parts of single-layer phase-change microcapsules are weighed, 15-27 parts of pure water are added, and stirred evenly.

[0038] Then heat the prepared solution to 40-50°C, add 0.2-0.6 parts of Tween 80 and 60-80 parts of aluminum nitrate, then add dropwise 5% ammonia solution to adjust the pH to 6-7, wait for 3 hours to keep warm, filter, Washing and drying obtain aluminum ...

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Abstract

A double-layer phase-change microcapsule and its preparation method and application provided by the present invention use the phase-change material inside the single-layer phase-change microcapsule as the capsule core, and the surface of the single-layer phase-change microcapsule is coated with an outer layer of a flame-retardant material cyst wall. When the temperature of the asphalt mixture reaches the temperature of the phase change material, the phase change material undergoes phase transition, absorbs and stores a large amount of heat, enhances the high temperature stability of the asphalt pavement, and has a good effect on reducing the rut depth. When the temperature of the asphalt mixture drops to the phase change temperature of the phase change material, the phase change material undergoes a phase change again, releasing a large amount of heat, which enhances the low-temperature crack resistance of the asphalt pavement, and has a good effect on reducing the crack width . The microcapsule phase change material has good mechanical properties, thermal stability and durability during the use of asphalt mixture, which greatly prolongs the service life of the phase change material.

Description

technical field [0001] The invention relates to the technical field of asphalt production, in particular to a double-layer phase-change microcapsule and a preparation method thereof, as well as a modified asphalt based on the double-layer phase-change microcapsule and a preparation method thereof. Background technique [0002] Single-layer phase-change microcapsules are a material that can adjust temperature. During the process of mixing with asphalt to form single-layer phase-change microcapsule-modified asphalt, the single-layer phase-change microcapsules are easy to break, resulting in the phase change material of the capsule core. overflow, such as figure 1 and 2 As shown, thus greatly affecting the service life of single-layer phase change microcapsule modified asphalt, which increases the cost of road maintenance. [0003] At the same time, considering that asphalt is a flammable material, there is a risk of burning during processing, storage, transportation and use....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06C08L95/00C08K9/10
Inventor 魏堃刘芳树陈坤马骉刘麦坚杨崎浩蒲峻尧董潇阳胡煦生
Owner CHANGAN UNIV
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