Preparation method of peroxide vulcanized fluororubber with high fluorine content

The invention provides a preparation method of high-fluorine-content peroxide vulcanized fluororubber, which adopts a perfluorinated organic peroxide initiation system to change the polymerization temperature of fluororubber and improve the relative reactivity rate of high-fluorine-content components, so that the fluorine content of the product reaches more than 70%; alkyl bromide is used as a chain transfer agent and a vulcanization point monomer, the low Mooney viscosity can reach 30 ML 121 DEG C 1 + 10 or below, bromine atoms are introduced into the molecular structure of the polymer, the effect of a cross-linking point is achieved in peroxide vulcanization, the vulcanization effect is improved, and the phenomena that the vulcanization effect of a vulcanization system becomes poor and the low Mooney viscosity is too high are avoided. 本发明提供了一种高氟含量过氧化物硫化氟橡胶的制备方法，它采用全氟有机过氧化物引发体系改变氟橡胶聚合温度，提高高含氟组分的相对竞聚率，使产物氟含量达到70%以上；使用烷基溴化物作为链转移剂和硫化点单体，既能使低门尼粘度达到30ML121℃1+10以下，又向聚合物的分子结构中引入了溴原子，在过氧化物硫化中起到交联点的作用，改善硫化效果，避免出现硫化体系