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Preparation and Properties of Poly (urea-formaldehyde) Microcapsules Containing Polysulfide Sealant |
Xuan WANG1, Tao JIN2, Haowei WANG2, Shengzhi LIAO2, Huaiyu YANG1() |
1 Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2 China Special Vehicle Research Institute, Aviation Key Laboratory of Science and Technology on Structural Corrosion Protection and Control, Jingmen 448035, China |
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Cite this article:
Xuan WANG, Tao JIN, Haowei WANG, Shengzhi LIAO, Huaiyu YANG. Preparation and Properties of Poly (urea-formaldehyde) Microcapsules Containing Polysulfide Sealant. Chinese Journal of Materials Research, 2018, 32(10): 730-736.
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Abstract Microcapsules of the urea resin encapsulated polysulfide sealant was designed and prepared successfully by in situ polymerization technology with the poly(urea-formaldehyde) resin (PUF) as shell material and the polysulfide sealant as core material. The surface morphology and chemical structure of the microcapsule were characterized by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR),respectively. In order to further investigate the effect of microencapsulation process on the mechanical properties of polysulfide sealant film after curing, a mixture of polysulfide sealant microcapsule and a certain proportion of vulcanizing agent was made, and then to apply polysulfide sealant containing film on standard nuts or to prepare test pieces of polysulfide containing sealant film respectively for mechanical testing. According to the relevant standards, the breaking torque, demolition torque, tensile strength and hardness of the polysulfide sealant film with unencapsulated and encapsulated polysulfide sealant respectively were comparatively tested. The results showed that based on the in-situ polymerization of PUF, the polysulfide sealant microcapsules with regular surface morphology, narrow particle size distribution, rough surface and dense shell were successfully prepared under the optimum reaction conditions. In comparison with the unencapsulated polysulfide sealant, the micro-encapsulated polysulfide sealant could greatly improve the mechanical properties of the sealant film. In short, the present research may provide an important reference for the exploring pre-coating technique of polysulfide sealant in the future.
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Received: 09 October 2017
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Fund: Supported by Special Project for Civil Aircraft of Ministry of Industry and Information Technology (No. MJ-2014-F-14) |
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