Water-permeable and fire-resistant film and a preparing method thereof

A method for preparing water-permeable and fire-resistant film comprising the following steps:

• mixing polyurethane resin with a first fire-resistant agent selected from the group consisting of paraffine chlorinated, decabromodiphenyI oxide, hexachloro benzene, hexabromo benzene, pentabromo ethyl benzene, pentabromo diphenyl oxide and octabromo diphenyl ether;
• a second fire-resistant agent selected from the group consisting of Sb2O3 and Sb2O5;
• an inorganic fire-resistant agent selected from the group consisting of Mg(OH)2, MoO3, Al(OH)3, P, CaCO3, CaOAl2O3.6H2O, MgCO3, CuO and Cu2O and an additive agent selected from the group consisting of Zn, Mg, ZrO2, TiO2, SiO2, SnO, ZnO and BaB2O4 to form a mixture;
• grinding said mixture;
• formulating said mixture to form a coating solution;
• applying said coating solution to a support;
• wet-curing said coating solution applied on said support to form a film.