Red phosphorus double-layer covered with both organic and inorganic material and its preparation process

The present invention is an inorganic - organic double coating of red phosphorus and a preparation method, wherein 20% -40% by weight of water was stirred at reflux condenser after milling in the reactor was slowly added a stoichiometric crude dispersion containing red phosphorus metal halide or sulphate and urea, the reaction 90-120 ℃ 4.0-6.0 hours, cooled, filtered and the filter cake was washed with water, and dried in vacuo dubbed 20-40% by weight water suspension; water-soluble resin is added, adjusting pH of 3-4 and heated, with stirring, cooled, filtered, washed with water, dried under vacuum, or oil-soluble resin is diluted with xylene or acetone or gasoline, and then mixed with the filter cake, stir, and dried in vacuo; the particle size to give 10- 50 nm hydroxide densely coated on the surface of red phosphorus particle diameter of not more than 1.0 mm, the organic coating layer is 2-10 nm thick coated on the inorganic closely cladding layer product; organic coating layer with less; raw materials, low cost.