Preparation And Application Of Macromolecular Si/P Flame Retardant

Flame retardant has become one of the most important additive in the polymer material as the second dosage after plasticizer. In this paper, a new type of phosphorus silicon synergistic flame retardant (PSA) was successfully prepared by phenyl dichlorophosphate, resorcinol and dimethyldichlorosilane, which was added to the typical polymer epoxy resin and polypropylene to study the impact of the flame retardancy, mechanical and thermal properties. The structure and properties of title compound were analysed and characterized.1. phosphorus-containing compound BHPP was synthesized by phenyl dichlorophosphate and resorcinol. The impact of the reaction temperature, reaction time, solvent and acid binding agent on the yield of the reaction were investigated, the optimized conditions of the preparation BHPP:ratio of resorcinol and phenyl dichlorophosphate is2:1, xylene as solvent, triethylamine as acid binding agent, the reaction temperature of120℃, the reaction time12h. The product was characterized by infrared and nuclear magnetic.2. Intermediate PS was synthesized by BHPP and dimethyldichlorosilane. The impact of the reaction temperature, reaction time, solvent and acid binding agent on the yield of the reaction were investigated, the optimized conditions of the preparation PS:ratio of resorcinol and phenyl dichlorophosphate is1:1, dioxane as solvent, triethylamine as acid binding agent, the reaction temperature of80℃, the reaction time22h.3. By using deionized water as reactants, hexamethyldisiloxane as a capping agent to synthesis silicon flame retardant PSA that containing phosphorus. The impact of the reaction ratio,reaction temperature, reaction time on the yield of the reaction and molecular weight were investigated, the optimum conditions of the preparation PSA:the ratio of PS and deionized water is1:1, the reaction temperature of80℃, reaction time22h. The product was characterized by infrared, nuclear magnetic and thermal gravimetric analysis.4. The PSA flame retardant was mixed to the epoxy resin and polypropylene to obtain a composite material. The impact of PSA content and molecular weight in the composite to the oxygen index (LOI), mechanical properties and thermal performance of the reaction were investigated. Studies indicated that the most suitable molecular weight and optimum content for PSA was16000and16wt%respectively. Phosphorus silicon flame retardants PSA can play preferably synergy role.5. Limiting oxygen index, tensile strength and impact strength of PSA epoxy composites was26.9,33.16MPa and10.16KJ/m2respectively. Limiting oxygen index, tensile strength and impact strength of PS A polypropylene composites was26.1,26.64MPa and41.12KJ/m2respectively. The TGA indicated that the carbon residue rate of PSA epoxy composite material raised from17.3%to22.4%and the PSA polypropylene composite material raised from0%to6%.