环氧树脂改性交联剂的制备及其对室温硫化硅橡胶性能的影响
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湖南科技学院化学与生物工程学院,永州 425000

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TB324

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湖南科技学院校级项目(18XKY075);湖南省教育厅科学研究项目(20C0849);湖南科技学院应用特色学科建设项目


Preparation of Crosslinking Agent Modified by Epoxy Resin and Its Effect on Properties of Room Temperature Vulcanized Silicone Rubber
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College of Chemical and Bioengineering,Hunan University of Science and Engineering,Yongzhou 425000

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    摘要:

    力学性能差是制约室温硫化硅橡胶应用发展的主要因素,而交联剂结构对力学性能有重要影响。为提高室温硫化硅橡胶的力学性能,本文以环氧树脂E-44与氨丙基三烷氧基硅烷为原料通过开环反应合成了一种改性交联剂(E44-APS),通过红外光谱、核磁氢谱确定了E44-APS的结构,并研究了E44-APS交联剂对室温硫化硅橡胶拉伸性能、固化性能、接触角、表面形貌、热稳定性的影响。结果表明,随E44-APS含量增加,室温硫化硅橡胶的拉伸强度先增加后降低,当E44-APS用量为10% 时,拉伸强度和断裂伸长率最大可达0.47 MPa和306%;固化时间随E44-APS用量增加而增加;5%热失重温度随E44-APS用量增加而降低;接触角随E44-APS用量增加先降低后增加。上述结果表明E44-APS可有效提高室温硫化硅橡胶的力学性能,同时会带来一些负面影响,如固化时间延长和热稳定性下降及疏水性下降等。

    Abstract:

    Poor mechanical properties was the major factor restricting the development of room temperature vulcanized silicone rubber application, the structure of crosslinking agent on the mechanical properties had important influence. In order to improve the mechanical properties of room temperature vulcanized silicone rubber, a kind of modified crosslinking agent (E44-APS) was synthesized by epoxy resin E-44 and ammonia propyl three alkoxy silane as raw material through ring opening reaction. The structure of E44-APS was determined by the infrared spectrum, nuclear magnetic hydrogen spectrum.The tensile properties, curing properties,contact angle, surface morphology,thermal stability of the room temperature vulcanized silicone rubber was studied. The experimental data show that with E44-APS content increases, the tensile strength of room temperature vulcanized silicone rubber increase first and then decrease.When E44-APS content is 10%, the tensile strength and elongation at break can be up to 0.47 MPa and 306%. Curing time increases with the increase of E44-APS content,5% heat temperature loss decreases with increasing content of E44-APS.With the increase of E44-APS content, contact angle reduces first and then increases. The results show that the E44-APS can effectively improve the mechanical properties of room temperature vulcanized silicone rubber, will also bring some negative impacts, such as curing time prolong and thermal stability and hydrophobic descent.

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曹雨扬,唐武飞,覃佐东,王毅,彭村.环氧树脂改性交联剂的制备及其对室温硫化硅橡胶性能的影响[J].宇航材料工艺,2023,53(5):56-61.

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历史
  • 收稿日期:2021-07-19
  • 最后修改日期:2023-07-05
  • 录用日期:2022-03-24
  • 在线发布日期: 2023-10-24
  • 出版日期: 2023-10-30
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