由于纤维特殊的成型工艺，要求在阻燃剂添加量低于15%时达到相应的阻燃要求，这对阻燃剂提出了更高的要求。本申请提出制备含有Lewis酸性位的硅酸盐分子筛作为阻燃协效剂，控制膨胀阻燃剂的添加量低于15%，达到制备阻燃聚丙烯纤维的要求。建立反应条件与所制备的含有Lewis酸性位的硅酸盐分子筛协效阻燃粒子的粒径及酸度之间的定量关系，进一步通过一系列的表征手段确定酸化分子筛的酸度与其对PP/膨胀阻燃纤维阻燃性能影响之间的关系。结合酸化分子筛在PP/膨胀阻燃纤维中体现出的结构与性能特征参数，发展完善固体酸协效阻燃理论。另外对不同结构的酸化分子筛对PP纤维的其它性能，如力学性能，纺丝过程中引入的结晶及取向结构的变化进行细致探讨。

A new type of synergistic flame retardant-4A type zeolite containing Lewis acid sites was introduced into the Polypropylene (PP)/ intumescent flame retardant (IFR) fiber. Due to the special preparing method, the content of flame retardants added into fiber is usually limited less than 15wt%, which put forward higher requirements to the flame retardants. In this work, attempts will be made to increase Lewis acid sites of zeolites via a high temperature treatment during which the zeolite is delaminated, and its acidity will be characterized by FT-IR. The relationship between the acidity of the 4A type zeolite containing Lewis acid sites and its effect on the flame retardant of PP/IFR fiber will be investigated quantificationally. The influence of the 4A type zeolite containing Lewis acid sites on the crystal and oriental properties of PP/IFR will be studied in detail, anyway that will bring effect on the mechenical properties of fiber. The interaction among PP, acid zeolite and IFR will be investigated. Furthermore the synergistic flame retardant mechanism of solid acid will be developed.