HIGH-MODULUS GLASS FIBER COMPOSITION, GLASS FIBER AND COMPOSITE MATERIAL ON ITS BASIS Russian patent published in 2023 - IPC C03C13/02 C03C3/95 

FIELD: glass fibre composition.

SUBSTANCE: present invention provides a glass fibre composition suitable for large-scale production of high modulus glass fibre, as well as glass fibre and a composite material based on it. The composition of high modulus glass fibre contains the following components in amounts expressed as a percentage by weight: 42-56.8 SiO₂, 15.8-24 Al₂O₃, 9.2-18 MgO, 0.1-6.5 CaO, more than 8 but not more than 20 Y₂O₃, 0.01-4 TiO₂, 0.01-1.5 Fe₂O₃, 0.01-1.5 Na₂O, 0-1.5 K₂O, 0-0.7 Li₂O, 0-3 SrO and 0 -2.9, La₂O₃, where the total percentage by weight of the above components is 98% or more. The percentage by mass ratio of C1=Y₂O₃/CaO is more than 2.1, and the ratio of C3=Y₂O₃ /(Al₂O₃+MgO) is 0,31 or more.

EFFECT: composition significantly increases the modulus of elasticity of the glass fibre, significantly reduces the clarification temperature and the content of bubbles in the molten glass; it also improves the cooling characteristics of the fiberglass and reduces the crystallization rate.

14 cl, 4 tbl, 28 ex