SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 55 ›› Issue (3): 137-147.DOI: 10.1016/j.cjche.2022.06.004

• Full Length Article • 上一篇    下一篇

A novel high-efficient P/N/Si-containing APP-based flame retardant with a silane coupling agent in its molecular structure for epoxy resin

Qiang Sun1, Jinlei Wang1, Xue Meng1, Jie Zhang1,2, Hong Yan1,2   

  1. 1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
    2. Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, China
  • 收稿日期:2021-10-16 修回日期:2022-05-28 出版日期:2023-03-28 发布日期:2023-06-03
  • 通讯作者: Hong Yan,E-mail:yanhong@tyut.edu.cn
  • 基金资助:
    This work was financially supported by the National Natural Science Foundation of China (22178242).

A novel high-efficient P/N/Si-containing APP-based flame retardant with a silane coupling agent in its molecular structure for epoxy resin

Qiang Sun1, Jinlei Wang1, Xue Meng1, Jie Zhang1,2, Hong Yan1,2   

  1. 1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
    2. Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, China
  • Received:2021-10-16 Revised:2022-05-28 Online:2023-03-28 Published:2023-06-03
  • Contact: Hong Yan,E-mail:yanhong@tyut.edu.cn
  • Supported by:
    This work was financially supported by the National Natural Science Foundation of China (22178242).

摘要: A flame retardant containing multiple antiflaming elements usually exhibits high-efficient flame retardancy. Here, a novel P/N/Si-containing ammonium polyphosphate derivative (APTES-APP) is synthesized from ammonium polyphosphate (APP) and silane coupling agent (3-aminopropyl)triethoxysilane (APTES) via cation exchange, which is quite different in the chemical structure from APTES-modified APP for retaining silicon hydroxyls. APTES-APP is highly efficient for the epoxy resin. 8% (mass) APTES-APP imparts excellent flame retardancy to the epoxy resin, with a V-0 rating at the UL-94 test (1.6 mm) and an LOI value of 26% (vol). The peak heat release rate and total smoke production of the flame-retardant epoxy resin are decreased by 68.1% and 31.3%, respectively. The synergy of P/N/Si contributes to the well-expanded char residue with a strong and dense surface layer, which is a very good barrier against heat and mass transfer. Besides, there is no significant deterioration in the mechanical properties of flame-retardant epoxy resin thanks to silicon hydroxyls forming hydrogen bonds with epoxy molecules. Meanwhile, other molecules can be grafted onto APTES-APP via these silicon hydroxyls, if needed. Briefly, this work has developed a new strategy for amino silane as flame retardants. In conjunction with a low-cost and simple preparation method, APTES-APP has a promising prospect in the high-performance flame-retardant epoxy.

关键词: Ammonium polyphosphate, Silane coupling agent, All-in-one system, Flame retardancy, Epoxy resin

Abstract: A flame retardant containing multiple antiflaming elements usually exhibits high-efficient flame retardancy. Here, a novel P/N/Si-containing ammonium polyphosphate derivative (APTES-APP) is synthesized from ammonium polyphosphate (APP) and silane coupling agent (3-aminopropyl)triethoxysilane (APTES) via cation exchange, which is quite different in the chemical structure from APTES-modified APP for retaining silicon hydroxyls. APTES-APP is highly efficient for the epoxy resin. 8% (mass) APTES-APP imparts excellent flame retardancy to the epoxy resin, with a V-0 rating at the UL-94 test (1.6 mm) and an LOI value of 26% (vol). The peak heat release rate and total smoke production of the flame-retardant epoxy resin are decreased by 68.1% and 31.3%, respectively. The synergy of P/N/Si contributes to the well-expanded char residue with a strong and dense surface layer, which is a very good barrier against heat and mass transfer. Besides, there is no significant deterioration in the mechanical properties of flame-retardant epoxy resin thanks to silicon hydroxyls forming hydrogen bonds with epoxy molecules. Meanwhile, other molecules can be grafted onto APTES-APP via these silicon hydroxyls, if needed. Briefly, this work has developed a new strategy for amino silane as flame retardants. In conjunction with a low-cost and simple preparation method, APTES-APP has a promising prospect in the high-performance flame-retardant epoxy.

Key words: Ammonium polyphosphate, Silane coupling agent, All-in-one system, Flame retardancy, Epoxy resin