High strength glass fiber

A method for preparing a glass fiber, comprising steps of:

• (1) weighing in a basis of a mass percentage of raw materials, respectively weighing zirconia grinding ball 4-5 times a weight of the raw materials and deionized water 1-2 times the weight of the raw materials, then ball milling the raw materials, the zirconia grinding ball and the deionized water for 12-24 hours and obtaining a mixture, wherein:
• the mass percentage of the raw materials is as follows:
• silica sol
• 50-60%;
• aluminum sol
• 24-31%;
• magnesia
• 8-11%;
• calcium oxide
• 4-5%;
• titanium dioxide
• 0.1-2%;
• ferric oxide
• 0-0.5%;
• niobium pentoxide
• 0.5-2%;
• antimony trioxide
• 0.5-1.5%;
• bismuth nitrate
• 0.3-1.5%;
• and
• boric acid
• 0.1-0.5%,
• wherein a sum of the mass percentage of the raw materials is 100%;
• (2) spray-drying the mixture through an atomizer, and obtaining a powder material, wherein:
• an inlet air temperature of spray-drying is in a range of 180-280° C. and an outlet air temperature thereof is in a range of 30-100° C.;
• (3) calcining the powder material at 700-900° C. for 1-3 hours, and then cooling the calcined powder material to a room temperature;
• (4) putting the calcined and cooled powder material into a rubber mold, isostatic pressing at 100-300 MPa in a cold isostatic press, and obtaining a compact block;
• (5) putting the compact block into a crucible, melting at 1400-1450° C. for 2-3 hours, and obtaining a molten glass fluid;
• and
• (6) decreasing a temperature of the glass fluid to a range of 1250-1300° C., and then performing fiber-drawing through a fiber drawing machine, and finally obtaining a continuous fiber with a size of 5-12 μm, wherein a rotating speed of the fiber drawing machine is in a range of 1000-1400 r/min.