Transparent halogen-free flame-retardant epoxy resin, material and preparation method thereof

The invention relates to the field of organic intermediate synthesis and high polymer materials, in particular to phosphorus-containing halogen-free flame-retardant epoxy resin, a preparation method thereof and an intrinsic flame-retardant transparent epoxy resin material. The invention provides transparent halogen-free flame-retardant epoxy resin, the structural formula of the transparent halogen-free flame-retardant epoxy resin is as shown in a formula I, and R is a residue of a reaction between epoxy resin and -OH in a flame retardant as shown in a formula II. The flame-retardant epoxy resin with the novel structure has flame-retardant property and transparency, and can be used for preparing an intrinsic flame-retardant transparent epoxy resin material. 本发明涉及有机中间体合成和高分子材料领域，具体而言，涉及一种含磷无卤阻燃环氧树脂及其制备方法和本征阻燃透明环氧树脂材料。本发明提供一种透明无卤阻燃环氧树脂，所述透明无卤阻燃环氧树脂的结构式如式I所示，其中，R为环氧树脂与式II所示阻燃剂中-OH反应的残基。本发明所得具有新结构的阻燃环氧树脂兼具阻燃特性和透明性，能够制得本征阻燃透明环氧树脂材料。