以苯酚、甲醛水溶液、二苯基磷酸为原料,制备了二苯基磷酸改性酚醛树脂(PPR)。通过傅里叶变换红外光谱(FT-IR)、核磁共振氢谱(1H-NMR)表征了PPR的结构。通过差示扫描量热法(DSC)对PPR的固化过程进行了研究,得到PPR的最佳固化工艺为100℃固化2h,130℃固化2h,150℃固化1h。通过热重分析(TG)、维卡软化点测试了PPR的耐热性能,通过极限氧指数、UL94垂直燃烧测试了PPR的阻燃性能。测试了PPR的拉伸剪切强度和冲击强度。结果表明:当二苯基磷酸用量为苯酚质量的14%时,PPR的综合性能最优,残炭率、极限氧指数、维卡软化点、拉伸剪切强度相比于普通酚醛树脂(PR)分别提高了17.4%、5%、29.5%、54.7%,UL94垂直燃烧达到V-0级。
Diphenyl phosphoric acid modified phenolic resin (PPR) was prepared using phenol,formaldehyde aqueous solution and diphenyl phosphoric acid as raw materials.The structure of PPR was characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (1H-NMR).The curing process of PPR was studied by differential scanning calorimetry (DSC),and the optimal curing process of PPR was determined to be 100℃ curing for 2h,130℃ curing for 2h,and 150℃ curing for 1h.The heat resistance of PPR was tested by thermogravimetric analysis (TG) and Vicat softening point.The flame retardancy of PPR was tested by limiting oxygen index and UL94 vertical combustion.The tensile shear strength and impact strength of PPR were tested.The results showed that when the amount of diphenyl phosphoric acid was 14% of the mass of phenol,the comprehensive performance of PPR was the best.The carbon residue rate,limiting oxygen index,Vicat softening point and tensile shear strength were increased by 17.4%,5%,29.5% and 54.7%,respectively,compared with ordinary phenolic resin (PR).UL94 vertical combustion reached V-0 level.
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