Abstract
A UV-curable, flame-retardant monomer, DAPP (bis[di-acryloyloxyethyl]-p-tert-butyl-phenyl-phosphate), was synthesized based on BPDCP (4-tert-butylphenyl-dichloro phosphate) and HEA (2-hydroxy ethyl acrylate). DAPP was blended with regular bisphenol A epoxy acrylate (BAEA) in various ratios to yield various phosphorus contents. The TGA-IR (thermogravimetric analyzer interface with an infrared spectrometer) results demonstrate that compounding 30 mol % DAPP with BAEA significantly reduced the amount of released CO gas. In contrast, the peak intensity of CO2 is independent of phosphorus content. The limiting oxygen index (LOI), reaching the saturated value of 26, and the heat release rate (HRR) measured using a cone-calorimeter, 156.43 KW/m2, confirm the saturation point when 30 mol % DAPP was compounded into BAEA. A study of the kinetics of pyrolysis reveals that Ea decreases as the phosphorus content increases. Both the TGA-IR and pyrolysis results reveal that the phosphorus compound DAPP is easily decomposed during the initial stage of burning to form an insulating layer, which inhibits further burning of the resin and the consequent release of other flammable gases.
Highlights
A non-halogen, flame-resistant coating can generally be produced by physically compounding phosphorus-containing additives into a polymeric matrix [1,2]
A UV curable flame retardant monomer DAPP that is based on BPDCP and HEA was synthesized and characterized by 1 H NMR, 31 P NMR, and IR spectrophotometer
The DAPP was blended with regular bisphenol A epoxy acrylate (BAEA) at various blend ratios to yield various phosphorus contents
Summary
A non-halogen, flame-resistant coating can generally be produced by physically compounding phosphorus-containing additives into a polymeric matrix [1,2]. Phosphorus-containing acrylate has recently attracted considerable attention as a flame-retardant oligomer for UV-cured films or coatings, owing to its non-halogenic characteristics and good dispersion of phosphorus throughout the compound [3,4,5,6,7]. These phosphorus-containing compounds have low toxicity, no dioxin generation, and no smoke during combustion. The effect of a newly synthesized phosphorus monomer-containing aromatic nucleus on the flame retardancy of epoxy resin is reported here. Thermal degradation was characterized using TGA and monitored over time using TGA-IR (thermogravimetric analyzer interface with an infrared spectrometer)
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