METHOD OF MAKING PREPREG Russian patent published in 2012 - IPC C08J5/24 B29B15/12 B32B27/00 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of making a prepreg based on a long woven filler with a different weave and can be used to make articles for transportation, aerospace and other purposes. The method of making the prepreg involves saturating woven filler with 65-75% solution of phenol formaldehyde binder, squeezing through rotating squeeze rolls and drying using a radiation method at temperature 130-160°C. A layer of polymer binder with concentration of 81-88% is then deposited on the outside of the prepreg at excess pressure and the prepreg undergoes thermal treatment at 160-180°C.

EFFECT: method enables to make prepregs with asymmetric deposition of polymer binder based on fabric made from carbon, glass, organic fibres or combinations thereof, with good strength characteristics of the obtained articles.

5 cl, 3 tbl, 3 ex