METHOD OF PRODUCING HIGH-TEMPERATURE RESISTANT SILICA FIBER Russian patent published in 2020 - IPC C03C13/00 C03B37/02 C03C25/68 

FIELD: manufacturing technology.

SUBSTANCE: present invention relates to a method of producing high-temperature resistant silica fiber, which can be used for building heat insulation, high-temperature insulation of electrical equipment, for fire protection and protective clothing, firefighters and rescuers. Charge for glass melting consists of quartz sand, alumina, soda, sodium sulphate, carbon nanopowder at the following ratio of components, wt%: sand 65.9-68.6; alumina 2.5-2.8; soda 27.4-30.1; sodium sulphate 1.2-1.5; carbon nanopowder (over 100%) 1.5-2.5. Charge is treated with ultrasound for 30-40 minutes at frequency 18 kHz and melting at temperature 1440-1460°C. After glass cooking, glass beads of the following composition are produced, wt. %: SiO₂ 75.30-78.40; Al₂O₃ 2.80-3.15; Na₂O and/or K₂O 18.50-21.43; carbon nanoparticles 0.05-0.07, impurities CaO; MgO; TiO₂; Fe₂O₃ 0.10-0.26. From glass beads on multifilter feeders having 1200 or 2400 spinnerets, glass fiber is formed, which is subjected to leaching and silica fiber of following composition is obtained, wt.%: SiO₂ 95.75-96.80; Al₂O₃ 3.10-3.35; Na₂O and/or K₂O 0.05-0.75; CaO; MgO; TiO₂; Fe₂O₃ 0.05-0.15.

EFFECT: low glass melting temperature and glass fiber formation, improved chemical homogeneity of the glass, reduced drop-over drop, reduced fiber leaching time.

1 cl, 7 tbl, 3 ex