METHOD FOR PRODUCING FINISHED GLASS FIBERS AND REINFORCED POLYMER COMPOSITION BASED ON THEM Russian patent published in 2024 - IPC C03C25/07 C08J5/08 C08L79/08 C08K7/14 C08K5/18 

FIELD: glass fibres.

SUBSTANCE: present invention relates to a method for producing finished glass fibres intended for special-purpose structural products in additive technologies. The method is based on sizing of glass fibre (GF) by applying a sizing component from a solution, followed by drying in an oven under vacuum, and the sizing component, which is 2,6-toluylenediamine (2,6-TDA), is applied from solutions in the ethyl alcohol head fraction with mass concentrations of 0.09-0.64%, kept at 20 °C for 15 minutes, with a stepwise increase in temperature and distillation of volatile fractions of the solvent according to the following regime: 35°C – 25 min; 50°C – 10 min; 60°C – 10 min; 85°C - 20 minutes, while drying in a vacuum oven is carried out at 91÷92°C, and the quantitative ratio of the components is, wt.%: 0.5÷3.5 – 2.6-TDA, 99.5÷96.5 – GF. The invention also relates to a polymer composite material used in the production of structural products in additive technologies, containing, wt.%: 80 of polymer matrix based on polyetherimide and 20 of finished glass fibre obtained by the above method.

EFFECT: improvement in the glass transition temperature of a polymer composite material based on a polyetherimide matrix polymer, reinforced with finished glass fibre as a filler, as well as the utilization of ethyl alcohol of the head fraction, which is a by-product in the production of ethanol.

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