Preparation and Characterization of Polysulfide Sealant Microcapsules Based on in situ Polymerization of Urea and Formaldehyde

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	Preparation and Characterization of Polysulfide Sealant Microcapsules Based on in situ Polymerization of Urea and Formaldehyde
	Wang, X; Jin, T; Wang, HW; Liao, SZ; Yang, HY; Yang, HY (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, Shenyang 110016, Liaoning, Peoples R China.
刊名	CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
	2018-02-10
卷号	39 期号:2 页码:397-404
关键词	Epoxy-resins Shell
ISSN号	0251-0790
英文摘要	A novel microcapsule of polysulfide sealant was designed and prepared by in situ polymerization technology with poly (urea-formaldehyde) resin (PUF) as shell material and polysulfide rubber as core material under the weak acid conditions. The microencapsulating process of core material, the morphology and chemical structure of microcapsule were monitored and characterized by surface observation and Fourier-transform infrared spectroscopy (FTIR) techniques, respectively. At the earlier stage of emulsification and dispersion, it was found that the particle diameter of dispersed polysulfide rubber decreased nonlinearly with the increase of PVA-124 concentration and PVA-124 was the best emulsifying agent among the various stabilizers studied. Through a large number of experiments, the following optimized conditions for the emulsification and dispersion of polysulfide rubber were obtained: using 1.5% (mass fraction) PVA solution as dispersion phase and PhMe as diluter, stirring speed 500 r/min and stirring time 0.5 h. At the later stage of polymerization reaction, we found that when the pH of solutions was adjusted to 2.5-3.5 and the reaction temperature was kept at 25 degrees C, the polysulfide rubber microspheres could be gradually coated by PUF with the increase of reaction time, and the polysulfide rubber microspheres were completely encapsuled after the polymerization reaction was continued for 6 h. Then the products were placed in dry oven at 50 degrees C for one day after filtering. The results indicated that PUF microcapsules containing polysulfide rubber could be successfully synthesized, which had regularly spherical shape, rough outer surface and good dispersion. In addition, the optical photos of microcapsules showed that the average particle diameter was about 200 mu m. Based on the detailed examining of some affecting factors such as emulsifier types and its concentration, stirring speed, reaction temperature and pH value, the optimum prepared condition was obtained. The quantitative analysis results revealed that the encapsulation efficiency of the core materials was 73% and the content of polysulfide sealant in microcapsules was 65% by ultraviolet (UV) spectrophotometer. The present work provides a valuable help for the further investigation and industrial application for the pre-coated technology of polysulfide sealant in the future.; A novel microcapsule of polysulfide sealant was designed and prepared by in situ polymerization technology with poly (urea-formaldehyde) resin (PUF) as shell material and polysulfide rubber as core material under the weak acid conditions. The microencapsulating process of core material, the morphology and chemical structure of microcapsule were monitored and characterized by surface observation and Fourier-transform infrared spectroscopy (FTIR) techniques, respectively. At the earlier stage of emulsification and dispersion, it was found that the particle diameter of dispersed polysulfide rubber decreased nonlinearly with the increase of PVA-124 concentration and PVA-124 was the best emulsifying agent among the various stabilizers studied. Through a large number of experiments, the following optimized conditions for the emulsification and dispersion of polysulfide rubber were obtained: using 1.5% (mass fraction) PVA solution as dispersion phase and PhMe as diluter, stirring speed 500 r/min and stirring time 0.5 h. At the later stage of polymerization reaction, we found that when the pH of solutions was adjusted to 2.5-3.5 and the reaction temperature was kept at 25 degrees C, the polysulfide rubber microspheres could be gradually coated by PUF with the increase of reaction time, and the polysulfide rubber microspheres were completely encapsuled after the polymerization reaction was continued for 6 h. Then the products were placed in dry oven at 50 degrees C for one day after filtering. The results indicated that PUF microcapsules containing polysulfide rubber could be successfully synthesized, which had regularly spherical shape, rough outer surface and good dispersion. In addition, the optical photos of microcapsules showed that the average particle diameter was about 200 mu m. Based on the detailed examining of some affecting factors such as emulsifier types and its concentration, stirring speed, reaction temperature and pH value, the optimum prepared condition was obtained. The quantitative analysis results revealed that the encapsulation efficiency of the core materials was 73% and the content of polysulfide sealant in microcapsules was 65% by ultraviolet (UV) spectrophotometer. The present work provides a valuable help for the further investigation and industrial application for the pre-coated technology of polysulfide sealant in the future.
学科主题	Chemistry, Multidisciplinary
语种	英语
资助机构	Special Project for Civil Aircraft of Ministry of Industry and Information Technology, China [MJ-2014-F-14]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79508]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yang, HY (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Wang, X,Jin, T,Wang, HW,et al. Preparation and Characterization of Polysulfide Sealant Microcapsules Based on in situ Polymerization of Urea and Formaldehyde[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2018,39(2):397-404.
APA	Wang, X,Jin, T,Wang, HW,Liao, SZ,Yang, HY,&Yang, HY .(2018).Preparation and Characterization of Polysulfide Sealant Microcapsules Based on in situ Polymerization of Urea and Formaldehyde.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,39(2),397-404.
MLA	Wang, X,et al."Preparation and Characterization of Polysulfide Sealant Microcapsules Based on in situ Polymerization of Urea and Formaldehyde".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 39.2(2018):397-404.