Double-layer phase-change microcapsules and production method and application thereof

A phase-change microcapsule and double-layer technology, which is applied in the field of asphalt manufacturing, can solve the problems of phase-change material volatilization and single-layer microcapsules are easy to break, and achieve enhanced high-temperature stability, good mechanical properties and thermal stability, and reduced Effect of rut depth

Active Publication Date: 2019-06-07
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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  • Double-layer phase-change microcapsules and production method and application thereof
  • Double-layer phase-change microcapsules and production method and application thereof
  • Double-layer phase-change microcapsules and production method and application thereof

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

The invention provides double-layer phase-change microcapsules and a production method and application thereof. A phase-change material in a single-layer phase-change micro cavity is used as a capsulecore, and outer layer capsule walls of a flame-retardant material cover single-layer phase-change microcapsules. When temperature of a bituminous mixture rises to temperature of the phase-change material, the phase-change material conducts phase transformation, and absorbs and stores a lot of heat, so that the high-temperature stability of a bituminous pavement is enhanced, and the phase-change material has a good effect on reducing rut depth. When the temperature of the bituminous mixture falls to phase-change temperature of the phase-change material, the phase-change material conducts phasetransformation again, and releases a lot of heat, so that the low-temperature anti-crack performance of the bituminous pavement is enhanced, and the phase-change material has a good effect on reducing crack width. The microcapsule phase-change material has good mechanical performance, thermal stability and durability in a use process of the bituminous mixture, so that the service life of the phase-change material is greatly prolonged.

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 Applications(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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