Preparation and performance evaluation of phase⁃change microcapsules and performance analysis of phase change asphalt

doi:10.19491/j.issn.1001-9278.2024.09.001

Abstract

Abstract:

In this study， the impact of phase⁃change microcapsules （PCM） on asphalt performance was investigated through a series of orthogonal experiments. These experiments focus on the evaluation of the effect of the urea⁃formaldehyde （melamine⁃urea⁃formaldehyde） resin as a shell material and n⁃tetradecane as a core material on the synthetic efficiency of PCM. The optimal preparation process for PCM was analyzed. Differential scanning calorimetry and dynamic shear rheology were employed to assess the performance of the PCM⁃modified asphalt （referring to as phase change bitumen）. The findings indicated that the most effective synthetic parameters were determined for PCM at an emulsifier concentration of 7 wt.%， an emulsification speed of 2 000 r/min， a mass ratio of core to wall material of 1∶1， a 1∶7 oil⁃to⁃water volume ratio， a synthetic time of 90 min， and a reaction temperature of 80 ℃. Under such conditions， PCM exhibited a latent heat of 117 J/g. Furthermore， the microcapsule shell presented excellent sealing properties， ensuring the stability of asphalt within the range required for construction temperature. The PCM⁃modified asphalt showed an exothermic interval from -7.1 to -17.9 ℃ and an endothermic interval from 2.3 to 13.5 ℃. The PCM⁃modified asphalt presented a phase⁃change enthalpy of 5.1 J/g at a microcapsule concentration of 7 wt.%. More importantly， the incorporation of PCM effectively slowed down the hardening process of the PCM⁃modified asphalt and maintained its stability at room temperature. The developed phase⁃change asphalt exhibits great potential for application.

Key words: phase change material, microcapsules, asphalt, n?tetradecane

CLC Number:

TQ323

TAN Jiao, WANG Junzhu, LI Shuai, LIU Xinye. Preparation and performance evaluation of phase⁃change microcapsules and performance analysis of phase change asphalt[J]. China Plastics, 2024, 38(9): 1-7.

Figures/Tables 17

水平	乳化浓度A/%	乳化转速B/r·min^-1	壁材/芯材C（质量比）	油相/水相D（体积比）	合成时间E/min	合成温度F/℃
1	3	2 000	1∶2	1∶3	30	70
2	5	3 000	1∶1	1∶5	60	75
3	7	4 000	3∶2	1∶7	90	80
4	9	5 000	2∶1	1∶9	180	85

Tab.1. Table of factor levels of orthogonal test

因素	A	B	C	D	E	F
K₁	48.258 93	61.452 89	51.214 53	50.258 96	39.127 56	49.483 31
K₂	62.145 28	55.135 89	61.846 32	53.214 85	55.485 03	43.876 95
K₃	63.863 54	57.138 57	60.125 99	69.856 94	67.954 23	74.475 21
K₄	60.123 58	58.148 62	59.295 34	59.632 48	67.123 58	66.285 48
极差	15.125 80	5.893 50	10.221 10	18.123 50	28.336 70	31.125 30
最佳方案	A3	B1	C2	D3	E3	F3

Tab.2. Results of the orthogonal test

Fig.1. SEM of microcapsules under different preparation conditions

Fig.2. Distribution of particle size

Fig.3. Results of thermogravimetric test

Fig.4. SEM after treatment at 170 ℃ for 30 min

Fig.5. DSC curves of phase change microcapsules

Fig.6. Leakage of the phase change microcapsules

Fig.7. Infrared spectrum of the phase change asphalt

Fig.8. Experimental results of the three major indicators of asphalt

Fig.9. DSC curves of the cooling exothermic process of phase change microencapsulated asphalt with different doping amounts

项目	放热阶段				吸热阶段
项目	1 %MPCM	3 %MPCM	5 %MPCM	7 %MPCM	1 %MPCM	3 %MPCM	5 %MPCM	7 %MPCM
起始温度/℃	-7.1	-8.9	-9.2	-8.3	4.3	3.8	3.9	2.3
峰值温度/℃	-11.5	-12.8	-13.6	-13.1	5.2	5.6	6.1	6.2
终止温度/℃	-14.2	-14.9	-15.9	-17.9	6.7	8.2	13.5	12.5
潜热/J·g^-1	1.435	3.359	3.854	5.258	1.125	3.973	4.197	5.726

Tab.3. Phase change parameters of the cooling exothermic process of microencapsulated asphalt with different doping amounts

Fig.10. Variation of latent heat of phase change asphalt under different temperature conditions

Fig.11. Law of the effect of the heat of phase transformation on the complex modulus and phase angle of asphalt

Fig.12. Frequency scan master curve fitting of phase change asphalt with different doping 25 ℃

Fig.13. Main curve fitting of frequency scan at 25 ℃ for different doping of tetradecane asphalt

Fig.14. Failure strain of phase change asphalt mixture

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