Preparation method of bamboo fiber water-repellent breathable paper

The invention relates to a preparation method of bamboo fiber water-repellent breathable paper, which comprises the following steps: pulping a bleached bamboo pulp board to prepare pulp with the beating degree of 45-65 degrees SR; adding sodium carboxymethyl cellulose and polyamide polyamine epichlorohydrin resin, and carrying out flow feeding on a net, squeezing, drying, surface sizing, surface spraying, drying and reeling to obtain the bamboo fiber water-repellent breathable paper. The surface sizing liquid is prepared by compounding self-made cationic organic silicon, alkyl ketene dimer and water; and self-made modified polyvinyl alcohol is sprayed on the surface to provide water resistance of the paper. According to the prepared bamboo fiber water-repellent breathable paper, the quantitation is 25-40 g/m < 2 >, the longitudinal tensile strength is larger than or equal to 3.5 kN/m, the wet tensile strength is larger than or equal to 0.50 kN/m, the water absorption is smaller than or equal to 9.0 g/m < 2 >,