Synthesis of melamine-formaldehyde microcapsules containing oil-based fragrances via intermediate polyacrylate bridging layers

doi:10.1016/j.cjche.2018.10.023

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (10): 2574-2580.DOI: 10.1016/j.cjche.2018.10.023

• Materials and Product Engineering • 上一篇下一篇

Synthesis of melamine-formaldehyde microcapsules containing oil-based fragrances via intermediate polyacrylate bridging layers

Yanping He¹, Shunzhi Yao¹, Junzheng Hao¹, Hong Wang², Linhua Zhu¹, Tian Si¹, Yanlin Sun¹, Jianhao Lin¹

1 School of Chemical Engineering, Kunming University of Science and Technology, Chenggong Campus, Kunming 650504, China;
2 Faculty of Science, Kunming University of Science and Technology, Chenggong Campus, Kunming 650504, China

收稿日期:2018-09-19 修回日期:2018-10-25 出版日期:2019-10-28 发布日期:2020-01-17
通讯作者: Yanlin Sun, Jianhao Lin
基金资助:
Supported by the National Natural Science Foundation of China (21466016, 21577053); and the Natural Science Foundation of Yunnan Province (2016FB024).

Synthesis of melamine-formaldehyde microcapsules containing oil-based fragrances via intermediate polyacrylate bridging layers

Yanping He¹, Shunzhi Yao¹, Junzheng Hao¹, Hong Wang², Linhua Zhu¹, Tian Si¹, Yanlin Sun¹, Jianhao Lin¹

1 School of Chemical Engineering, Kunming University of Science and Technology, Chenggong Campus, Kunming 650504, China;
2 Faculty of Science, Kunming University of Science and Technology, Chenggong Campus, Kunming 650504, China

Received:2018-09-19 Revised:2018-10-25 Online:2019-10-28 Published:2020-01-17
Contact: Yanlin Sun, Jianhao Lin
Supported by:
Supported by the National Natural Science Foundation of China (21466016, 21577053); and the Natural Science Foundation of Yunnan Province (2016FB024).

摘要/Abstract

摘要： A general and versatile strategy to prepare melamine-formaldehyde (MF) microcapsules encapsulating oil-based fragrances by combining solvent evaporation and in situ polymerization was proposed in this work. The oil-based fragrance was pre-encapsulated by an inner polyacrylate membrane via solvent evaporation, followed by in situ polymerization of MF precondensates as an outer shell. The polyacrylate membrane is used as an intermediate bridging layer to stabilize the oil-based fragrance, and to provide driving forces for in situ polymerization of MF precondensates through electrostatic attractions between carboxyl groups and ammonium ions. It was demonstrated that MF microcapsules containing clove oil were prepared successfully. The amount and the composition of the intermediate polyacrylate bridging layer were critical. Smooth and sphere-shaped MF-clove oil microcapsules were prepared when the weight ratio of polyacrylate to clove oil was over 60 wt% and the concentration of acrylic acid (AA) increased to 10 wt% in polyacrylate. In addition, MF microcapsules containing sunflower oil and hexyl salicylate were prepared by using this method. The work suggests that this new approach can be potentially used to encapsulate various core materials, tuning the shell properties of microcapsules such as thickness, mechanical strength and release properties.

关键词: Melamine formaldehyde, Microcapsule, Oil-based fragrance, Particle, Polymers, Synthesis

Abstract: A general and versatile strategy to prepare melamine-formaldehyde (MF) microcapsules encapsulating oil-based fragrances by combining solvent evaporation and in situ polymerization was proposed in this work. The oil-based fragrance was pre-encapsulated by an inner polyacrylate membrane via solvent evaporation, followed by in situ polymerization of MF precondensates as an outer shell. The polyacrylate membrane is used as an intermediate bridging layer to stabilize the oil-based fragrance, and to provide driving forces for in situ polymerization of MF precondensates through electrostatic attractions between carboxyl groups and ammonium ions. It was demonstrated that MF microcapsules containing clove oil were prepared successfully. The amount and the composition of the intermediate polyacrylate bridging layer were critical. Smooth and sphere-shaped MF-clove oil microcapsules were prepared when the weight ratio of polyacrylate to clove oil was over 60 wt% and the concentration of acrylic acid (AA) increased to 10 wt% in polyacrylate. In addition, MF microcapsules containing sunflower oil and hexyl salicylate were prepared by using this method. The work suggests that this new approach can be potentially used to encapsulate various core materials, tuning the shell properties of microcapsules such as thickness, mechanical strength and release properties.

Key words: Melamine formaldehyde, Microcapsule, Oil-based fragrance, Particle, Polymers, Synthesis

Yanping He, Shunzhi Yao, Junzheng Hao, Hong Wang, Linhua Zhu, Tian Si, Yanlin Sun, Jianhao Lin. Synthesis of melamine-formaldehyde microcapsules containing oil-based fragrances via intermediate polyacrylate bridging layers[J]. 中国化学工程学报, 2019, 27(10): 2574-2580.

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Synthesis of melamine-formaldehyde microcapsules containing oil-based fragrances via intermediate polyacrylate bridging layers

Synthesis of melamine-formaldehyde microcapsules containing oil-based fragrances via intermediate polyacrylate bridging layers

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