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A Simple and Efficient Magnesium Hydroxide Modification Strategy for Flame-Retardancy Epoxy Resin.
Linan Dun1,2, Zeen Ouyang2, Qihao Sun1
1College of Materials Science and Engineering, Northeastern University, Shenyang 110004, China.
A novel flame retardant, magnesium hydroxide coated with 2-(diphenyl phosphine) benzoic acid (MH@PPAC), significantly enhances epoxy resin (EP) fire safety. This additive improves dispersion and achieves a V-0 rating with reduced smoke and toxic gas emissions.
Area of Science:
- Materials Science
- Polymer Chemistry
- Fire Safety Engineering
Background:
- Magnesium hydroxide (MH) is a green flame retardant for polymers.
- Poor dispersion and low efficiency limit MH use in epoxy resins (EP).
- Surface modification is explored to overcome MH limitations in EP.
Purpose of the Study:
- To develop an efficient MH-based flame retardant for EP.
- To investigate the flame-retardancy properties and mechanism of the modified additive.
- To assess the impact on EP mechanical properties.
Main Methods:
- Surface modification of MH using 2-(diphenyl phosphine) benzoic acid (PPAC).
- Preparation of EP/MH@PPAC composites at varying loadings.
- Evaluation of flame retardancy using Limiting Oxygen Index (LOI) and UL-94 tests.
- Analysis of combustion behavior via cone calorimetry (heat release, smoke production).
- Assessment of mechanical properties and dispersion via SEM.
Main Results:
- MH@PPAC achieved a V-0 rating for EP with 5 wt% loading, increasing LOI from 24.1% to 38.9%.
- Significant reductions in peak heat release rate (53%), peak smoke production rate (45%), total smoke production rate (51.85%), and peak CO generation rate (53.13%) were observed.
- Enhanced dispersion of MH in the EP matrix was confirmed.
- The modified additive promoted a dense char layer, hindering combustion.
Conclusions:
- MH@PPAC acts as an effective flame retardant for EP, improving fire safety.
- The synergistic effect of PPAC and MH enhances char formation and reduces smoke/gas emissions.
- Improved dispersion leads to superior mechanical properties, broadening applications for flame-retardant EP.
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