High-strength high-modulus glass fiber and preparation method thereof

The invention relates to high-strength high-modulus glass fiber. The high-strength high-modulus glass fiber is prepared from the following components: 53-57wt% of SiO2, 23-26wt% of Al2O3, 11.5-14.5wt% of MgO, 2-4wt% of B2O3, 0.2-1.0wt% of Fe2O3, 0.2-1.0wt% of CeO2, 0.2-0.8wt% of Li2O, 0-1wt% of TiO2, ZrO2, Y2O3 and other compounds, wherein the total weight of the ZrO2, Y2O3 and the other compounds is smaller than 1wt%. The high-strength high-modulus glass fiber has the advantages that the mechanical performance is good, i.e., the monofilament tensile strength reaches 4540-4720MPa, the modulus of elasticity for tension reaches 85-87MPa, the density of the glass fiber is equivalent to that of E glass, and compared with the traditional E glass fiber, the high-strength high-modulus glass fiber has the advantages that the monofilament tensile strength is improved by more than 30%, and the modulus of elasticity for tension is improved by more than 18%.