脲醛树脂包覆聚硫密封剂微胶囊的制备和性能

doi:10.11901/1005.3093.2017.579

材料研究学报

2018, Vol. 32

Issue (10): 730-736 DOI: 10.11901/1005.3093.2017.579

研究论文

本期目录 | 过刊浏览

脲醛树脂包覆聚硫密封剂微胶囊的制备和性能

王璇¹, 金涛², 王浩伟², 廖圣智², 杨怀玉¹(

)

1 中国科学院金属研究所金属腐蚀与防护实验室沈阳 110016
2 中国特种飞行器研究所结构腐蚀防护与控制航空科技重点实验室荆门 448035

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

引用本文:

王璇, 金涛, 王浩伟, 廖圣智, 杨怀玉. 脲醛树脂包覆聚硫密封剂微胶囊的制备和性能[J]. 材料研究学报, 2018, 32(10): 730-736.
Xuan WANG, Tao JIN, Haowei WANG, Shengzhi LIAO, Huaiyu YANG. Preparation and Properties of Poly (urea-formaldehyde) Microcapsules Containing Polysulfide Sealant[J]. Chinese Journal of Materials Research, 2018, 32(10): 730-736.

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摘要:

以脲醛树脂为壁材、聚硫密封剂为芯材,采用原位聚合制备出聚硫密封剂微胶囊,并使用红外光谱、扫描电镜等手段表征了微胶囊的结构和形貌。为了研究微胶囊化过程对密封剂固化胶膜力学性能的影响,将聚硫密封剂微胶囊与一定比例的硫化剂均匀混合分别制备成标准螺母试件或胶膜试片,依据相关标准系统考察了聚硫密封剂包覆前后破坏力矩、拆卸力矩和拉伸性能以及硬度的变化。结果表明,基于脲醛原位聚合可制备出形貌规则、粒径均一、表面相对粗糙、包覆膜致密的聚硫密封剂微胶囊,与未包覆密封剂相比包覆后聚硫密封剂胶膜的力学性能大幅度提高。

关键词 ：有机高分子材料, 聚硫密封剂, 微胶囊, 力矩, 拉伸性能, 硬度

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.

Key words： organic polymer materials polysulfide sealant microcapsules torque tensile property hardness

收稿日期: 2017-10-09

ZTFLH:

TQ333

基金资助:工信部民机专项(MJ-2014-F-14)

作者简介:

作者简介王璇,女,1988年生,博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.579 或 https://www.cjmr.org/CN/Y2018/V32/I10/730

图1 脲醛树脂、聚硫橡胶和聚硫密封剂微胶囊的红外光谱

图2 聚硫密封剂微胶囊颗粒的表面形貌

图3 聚硫密封剂微胶囊的粒径分布

图4 包覆前后密封剂Tb力矩和Td力矩随着硫化时间的变化

图5 包覆前后密封剂拉伸强度、断裂强度和断裂伸长率随着硫化时间的变化

图6 在硫化时间不同的条件下包覆前后密封剂的硬度

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