The invention provides a low-
dielectric glass fiber composition, a low-
dielectric glass fiber and a preparation method thereof, and the low-
dielectric glass fiber composition comprises the following components in
molar percentage: 54 to 60 percent of SiO2, 21 to 32 percent of B2O3, 1.0 to 9.5 percent of Al2O3, 3 to 16 percent of
alkaline earth metal oxide, 0.01 to 4.0 percent of ZrO2, 0.1 to 4.0 percent of TiO2, 0.01 to 2.0 percent of LiO2 and 0.5 to 5.0 percent of F2. Wherein the
alkaline earth metal oxide comprises CaO and MgO, and according to the
molar percentage, the CaO accounts for 0.01%-4.0%, and the MgO accounts for 0.5%-8.0%. According to the glass
fiber, SiO2 and B2O3 are taken as main components of the glass, SiO2 can be taken as a network former of a
glass structure, on one hand, part of B2O3 can form a [BO4] tetrahedral structure to enter a glass silica
network structure so as to play a role in reinforcing a net, and on the other hand, B2O3 can effectively inhibit
ion polarization so as to reduce the dielectric constant and
dielectric loss of the glass
fiber; according to the present invention, the specific type of the
alkaline earth metal oxide is added, and the certain content of the Al2O3, the ZrO2, the TiO2, the LiO2 and the F2 is supplemented so as to further reduce the dielectric constant and the
dielectric loss of the glass
fiber, and the cooperative control of the components is beneficial to the improvement of the glass
processing property and the guarantee of the glass
fiber drawing stability.