Study Of Nanoparticles-phosphine/Acrylate Resin Composites:Preparation,Thermal Stability And Synergetic Flame Retardancy Effect

In this paper, the thermal decomposition process of acrylic resin(AR) is discussed. hybrid retardant-elements and nano-particles were applied in acrylic resin are reviewed. The synthesis of flame retardant 2-hydroxyethyl-2-methyl-3-(6-oxido-6Hdibenzo[c,e][1,2]oxaph-osphinin-6-yl)propanoate(DOPOHM) and preparation of its composites are studied. Meanwhile, effect of phosphorous element and its derivatives and synergetic system containing as-obtain on acrylate resin are introduced.The flame retardant DOPOHM was prepared by 9-Oxa-10-phospha-phenanthr-ene 10-oxide(DOPO). The flame retardant composites: DOPOHM/AR, Zn B-DOPOHM/AR and Alu-DOPOHM/AR were prepared by acrylate resin as matrix and zinc borate(Zn B) and aluminum hydroxide(Alu). The thermal stability and flame retardancy level of composites was characterized by TGA and Limit Oxygen Index(LOI), and synergetic mechanism was stduied by SEM,XPS and EDS. The decomposition activation energy(Ea) of composites was calculated by Horowitz-Metzger thoery.The result show that Ea of DOPOHM/AR composites improve as DOPOHM content increased. The DOPOHM exert inhibited effect on thermal degradation of polymer chain, and catalyze matrix formed dense char layer covering the surface of composites to be barrier to prevent heat and decomposition products escaped. The LOI of materials reach to 26 when DOPOHM content is 25 wt.%;The thermal stability and LOI of Zn B-DOPOHM/AR are much higher than that of DOPOHM/AR and improve with Zn B amount increased. The LOI of 3%Zn B-DOPOHM/AR is 32. The further Compact char is formed due to synergistic effect between DOPOHM and Zn B. The phosphine catalyze matrix formed char layer on the surface of Zn O and B2O3 produced by degradation of Zn B, and Zn O-P2O5 formed due to reaction of Zn O and phosphine. The calculated results show that Zn O and B2O3 positive catalytic role and collaborative phosphine-catalyzed process reinforce capability of char produced; The thermal stability and LOI of Alu-DOPOHM/AR are much higher than that of DOPOHM/AR and improve with Alu amount increased. The LOI of 3%Alu-DOPOHM/AR is 28. The phosphine catalyze matrix formed char layer on the surface of Al2O3 produced by degradation of Al(OH)3 and formed Al4(P2O7)3. The calculated decomposition activation energies(Ea) results indicate that process of phosphine-catalyzed composite decomposed is reinforced by positive catalytic role of Al2O3 to with increased flame retardant effect in collaboration.In generally, the flame retardancy effects to acrylate resin is obveriously appeared due to 2-hydroxyethyl-2-methyl-3-(6-oxido-6H-dibenzo[c,e][1,2]oxaph-osphinin-6-yl)propanoate(DOPOHM). Besides, the synergistic flame retardant existed is proven by nano-particles involved(Zn B and Alu) and phosphine(DOPOHM).There is prior order in capacity of flame retardant by kinds of composites in this study,under the equivalent fill’s content: Zn B-DOPOHM/AR(29)Alu-DOPOHM/AR(29)DOPOHM/AR.