Preparation and characterization of flame retardant epoxy resins based on phosphorus-containing biphenyl-type phenolic resin

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Jiapei Ding ◽  
Zhiqiang Tao ◽  
Lin Fan ◽  
Shiyong Yang
Keyword(s):  
Flame Retardant ◽  
Epoxy Resins ◽  
Phenolic Resin ◽  
Phosphorus Loading ◽  
Curing Agent ◽  
Good Thermal Stability ◽  
Phosphorus Containing ◽  
Strong Lewis Acid ◽  
Flame Retardant Properties

AbstractA phosphorus-containing biphenyl-type phenolic resin (PBP) was prepared by dehydration polycondensation of the DOPO-disubstituted 4,4’- biphenyldimethanol compound (BDCA-2DOPO) with phenol in the presence of strong Lewis acid , in which BDCA-2DOPO was prepared by the reaction of DOPO with 4,4'-biphenyldicarboxaldehyde. The PBP resin has been evaluated as the curing agent of o-cresol epoxy resins. Experimental results indicated that the PBPcured epoxy resins exhibited good thermal stability, high char yields at 700 oC and outstanding flame retardant properties. UL 94 V-0 classifications could be obtained when the phosphorus loading in the epoxy resin is higher than 1.8 wt%.

Improving thermal and flame-retardant properties of epoxy resins by a new imine linkage phosphorous-containing curing agent

2016 ◽  
Vol 56 (4) ◽  
pp. 441-447 ◽  
Author(s):  
Cong Xie ◽  
Jifu Du ◽  
Zhen Dong ◽  
Shaofa Sun ◽  
Long Zhao ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Epoxy Resins ◽  
Curing Agent ◽  
Flame Retardant Properties

Improving thermal and flame-retardant properties of epoxy resins by a novel reactive phosphorous-containing curing agent

2013 ◽  
Vol 54 (5) ◽  
pp. 1192-1200 ◽  
Author(s):  
Cong Xie ◽  
Birong Zeng ◽  
Hui Gao ◽  
Yiting Xu ◽  
Weiang Luo ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Epoxy Resins ◽  
Curing Agent ◽  
Flame Retardant Properties

scholarly journals A phosphorus-containing hyperbranched phthalocyanine flame retardant for epoxy resins

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Penglun Zheng ◽  
Rui Wang ◽  
Donghui Wang ◽  
Xiaoliang Peng ◽  
Yang Zhao ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Gas Phase ◽  
Epoxy Resins ◽  
Copper Phthalocyanine ◽  
Char Layer ◽  
Phosphorus Containing ◽  
Flame Retarded ◽  
Flame Retardant Properties ◽  
Combustible Gases ◽  
The Stability

AbstractA hyperbranched phosphorus-containing copper phthalocyanine compound (DOPO-CuPc) was successfully synthesized and used as the flame-retardant additive to prepare flame-retarded epoxy thermosets. The addition of DOPO-CuPc led to a significant enhancement of the flame retardant properties of the epoxy resin. The 15DOPO-CuPc/EP composite obtained a LOI value of 35.8%, and the UL-94 rose from NR to V-0 rating. And the addition of DOPO-CuPc resulted in early decomposition of the epoxy thermoset, but the residual char at 700 °C reached 27.7%. The flame retardant mechanism was further investigated. It was found that DOPO-CuPc could release phosphorus-containing radicals and non-combustible gases in the gas phase to exert gas-phase flame retardant activity. In the condensed phase, the epoxy thermoset formed the expanded honeycomb-like char layer during combustion and the presence of copper phthalocyanine contributed to the stability of the char layer.

scholarly journals An Effective Method for Preparation of Liquid Phosphoric Anhydride and Its Application in Flame Retardant Epoxy Resin

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2205
Author(s):  
Qian Li ◽  
Yujie Li ◽  
Yifan Chen ◽  
Qiang Wu ◽  
Siqun Wang
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Oxygen Index ◽  
Decomposition Temperature ◽  
Ease Of Use ◽  
Limiting Oxygen Index ◽  
Good Thermal Stability ◽  
Low Viscosity ◽  
The Impact

A novel liquid phosphorous-containing flame retardant anhydride (LPFA) with low viscosity was synthesized from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and methyl tetrahydrophthalic anhydride (MeTHPA) and further cured with bisphenol-A epoxy resin E-51 for the preparation of the flame retardant epoxy resins. Both Fourier transform infrared spectroscopy (FT-IR), mass spectrometry (MS) and nuclear magnetic resonance (NMR) measurements revealed the successful incorporation of DOPO on the molecular chains of MeTHPA through chemical reaction. The oxygen index analysis showed that the LPFA-cured epoxy resin exhibited excellent flame retardant performance, and the corresponding limiting oxygen index (LOI) value could reach 31.2%. The UL-94V-0 rating was achieved for the flame retardant epoxy resin with the phosphorus content of 2.7%. With the addition of LPFA, the impact strength of the cured epoxy resins remained almost unchanged, but the flexural strength gradually increased. Meanwhile, all the epoxy resins showed good thermal stability. The glass transition temperature (Tg) and thermal decomposition temperature (Td) of epoxy resin cured by LPFA decreased slightly compared with that of MeTHPA-cured epoxy resin. Based on such excellent flame retardancy, low viscosity at room temperature and ease of use, LPFA showed potential as an appropriate curing agent in the field of electrical insulation materials.

scholarly journals Synthesis and characterization of PEDMCD as a flame retardant and its application in epoxy resins

RSC Advances ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 2756-2766
Author(s):  
Yi Zhang ◽  
Weiwei Yang
Keyword(s):  
Flame Retardant ◽  
Epoxy Resins ◽  
Synthesis And Characterization ◽  
Direct Polycondensation ◽  
Polycondensation Reaction ◽  
Highly Effective

In this study, a highly effective flame retardant agent, called polybicyclopentaerythritol phosphate-O-4-imino-p-phenylmethane-4-imino-2-chloro-1,3,5-s-triazine (PEDMCD), has been prepared through a direct polycondensation reaction.

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